linux/drivers/staging/android/binder.c
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   1/* binder.c
   2 *
   3 * Android IPC Subsystem
   4 *
   5 * Copyright (C) 2007-2008 Google, Inc.
   6 *
   7 * This software is licensed under the terms of the GNU General Public
   8 * License version 2, as published by the Free Software Foundation, and
   9 * may be copied, distributed, and modified under those terms.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 */
  17
  18#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20#include <asm/cacheflush.h>
  21#include <linux/fdtable.h>
  22#include <linux/file.h>
  23#include <linux/fs.h>
  24#include <linux/list.h>
  25#include <linux/miscdevice.h>
  26#include <linux/mm.h>
  27#include <linux/module.h>
  28#include <linux/mutex.h>
  29#include <linux/nsproxy.h>
  30#include <linux/poll.h>
  31#include <linux/debugfs.h>
  32#include <linux/rbtree.h>
  33#include <linux/sched.h>
  34#include <linux/seq_file.h>
  35#include <linux/uaccess.h>
  36#include <linux/vmalloc.h>
  37#include <linux/slab.h>
  38#include <linux/pid_namespace.h>
  39
  40#include "binder.h"
  41#include "binder_trace.h"
  42
  43static DEFINE_MUTEX(binder_main_lock);
  44static DEFINE_MUTEX(binder_deferred_lock);
  45static DEFINE_MUTEX(binder_mmap_lock);
  46
  47static HLIST_HEAD(binder_procs);
  48static HLIST_HEAD(binder_deferred_list);
  49static HLIST_HEAD(binder_dead_nodes);
  50
  51static struct dentry *binder_debugfs_dir_entry_root;
  52static struct dentry *binder_debugfs_dir_entry_proc;
  53static struct binder_node *binder_context_mgr_node;
  54static kuid_t binder_context_mgr_uid = INVALID_UID;
  55static int binder_last_id;
  56static struct workqueue_struct *binder_deferred_workqueue;
  57
  58#define BINDER_DEBUG_ENTRY(name) \
  59static int binder_##name##_open(struct inode *inode, struct file *file) \
  60{ \
  61        return single_open(file, binder_##name##_show, inode->i_private); \
  62} \
  63\
  64static const struct file_operations binder_##name##_fops = { \
  65        .owner = THIS_MODULE, \
  66        .open = binder_##name##_open, \
  67        .read = seq_read, \
  68        .llseek = seq_lseek, \
  69        .release = single_release, \
  70}
  71
  72static int binder_proc_show(struct seq_file *m, void *unused);
  73BINDER_DEBUG_ENTRY(proc);
  74
  75/* This is only defined in include/asm-arm/sizes.h */
  76#ifndef SZ_1K
  77#define SZ_1K                               0x400
  78#endif
  79
  80#ifndef SZ_4M
  81#define SZ_4M                               0x400000
  82#endif
  83
  84#define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  85
  86#define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  87
  88enum {
  89        BINDER_DEBUG_USER_ERROR             = 1U << 0,
  90        BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  91        BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  92        BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  93        BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
  94        BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
  95        BINDER_DEBUG_READ_WRITE             = 1U << 6,
  96        BINDER_DEBUG_USER_REFS              = 1U << 7,
  97        BINDER_DEBUG_THREADS                = 1U << 8,
  98        BINDER_DEBUG_TRANSACTION            = 1U << 9,
  99        BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 100        BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 101        BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 102        BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
 103        BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 104        BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 105};
 106static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 107        BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 108module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 109
 110static bool binder_debug_no_lock;
 111module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 112
 113static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 114static int binder_stop_on_user_error;
 115
 116static int binder_set_stop_on_user_error(const char *val,
 117                                         struct kernel_param *kp)
 118{
 119        int ret;
 120        ret = param_set_int(val, kp);
 121        if (binder_stop_on_user_error < 2)
 122                wake_up(&binder_user_error_wait);
 123        return ret;
 124}
 125module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 126        param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 127
 128#define binder_debug(mask, x...) \
 129        do { \
 130                if (binder_debug_mask & mask) \
 131                        pr_info(x); \
 132        } while (0)
 133
 134#define binder_user_error(x...) \
 135        do { \
 136                if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 137                        pr_info(x); \
 138                if (binder_stop_on_user_error) \
 139                        binder_stop_on_user_error = 2; \
 140        } while (0)
 141
 142enum binder_stat_types {
 143        BINDER_STAT_PROC,
 144        BINDER_STAT_THREAD,
 145        BINDER_STAT_NODE,
 146        BINDER_STAT_REF,
 147        BINDER_STAT_DEATH,
 148        BINDER_STAT_TRANSACTION,
 149        BINDER_STAT_TRANSACTION_COMPLETE,
 150        BINDER_STAT_COUNT
 151};
 152
 153struct binder_stats {
 154        int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 155        int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 156        int obj_created[BINDER_STAT_COUNT];
 157        int obj_deleted[BINDER_STAT_COUNT];
 158};
 159
 160static struct binder_stats binder_stats;
 161
 162static inline void binder_stats_deleted(enum binder_stat_types type)
 163{
 164        binder_stats.obj_deleted[type]++;
 165}
 166
 167static inline void binder_stats_created(enum binder_stat_types type)
 168{
 169        binder_stats.obj_created[type]++;
 170}
 171
 172struct binder_transaction_log_entry {
 173        int debug_id;
 174        int call_type;
 175        int from_proc;
 176        int from_thread;
 177        int target_handle;
 178        int to_proc;
 179        int to_thread;
 180        int to_node;
 181        int data_size;
 182        int offsets_size;
 183};
 184struct binder_transaction_log {
 185        int next;
 186        int full;
 187        struct binder_transaction_log_entry entry[32];
 188};
 189static struct binder_transaction_log binder_transaction_log;
 190static struct binder_transaction_log binder_transaction_log_failed;
 191
 192static struct binder_transaction_log_entry *binder_transaction_log_add(
 193        struct binder_transaction_log *log)
 194{
 195        struct binder_transaction_log_entry *e;
 196        e = &log->entry[log->next];
 197        memset(e, 0, sizeof(*e));
 198        log->next++;
 199        if (log->next == ARRAY_SIZE(log->entry)) {
 200                log->next = 0;
 201                log->full = 1;
 202        }
 203        return e;
 204}
 205
 206struct binder_work {
 207        struct list_head entry;
 208        enum {
 209                BINDER_WORK_TRANSACTION = 1,
 210                BINDER_WORK_TRANSACTION_COMPLETE,
 211                BINDER_WORK_NODE,
 212                BINDER_WORK_DEAD_BINDER,
 213                BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 214                BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 215        } type;
 216};
 217
 218struct binder_node {
 219        int debug_id;
 220        struct binder_work work;
 221        union {
 222                struct rb_node rb_node;
 223                struct hlist_node dead_node;
 224        };
 225        struct binder_proc *proc;
 226        struct hlist_head refs;
 227        int internal_strong_refs;
 228        int local_weak_refs;
 229        int local_strong_refs;
 230        void __user *ptr;
 231        void __user *cookie;
 232        unsigned has_strong_ref:1;
 233        unsigned pending_strong_ref:1;
 234        unsigned has_weak_ref:1;
 235        unsigned pending_weak_ref:1;
 236        unsigned has_async_transaction:1;
 237        unsigned accept_fds:1;
 238        unsigned min_priority:8;
 239        struct list_head async_todo;
 240};
 241
 242struct binder_ref_death {
 243        struct binder_work work;
 244        void __user *cookie;
 245};
 246
 247struct binder_ref {
 248        /* Lookups needed: */
 249        /*   node + proc => ref (transaction) */
 250        /*   desc + proc => ref (transaction, inc/dec ref) */
 251        /*   node => refs + procs (proc exit) */
 252        int debug_id;
 253        struct rb_node rb_node_desc;
 254        struct rb_node rb_node_node;
 255        struct hlist_node node_entry;
 256        struct binder_proc *proc;
 257        struct binder_node *node;
 258        uint32_t desc;
 259        int strong;
 260        int weak;
 261        struct binder_ref_death *death;
 262};
 263
 264struct binder_buffer {
 265        struct list_head entry; /* free and allocated entries by address */
 266        struct rb_node rb_node; /* free entry by size or allocated entry */
 267                                /* by address */
 268        unsigned free:1;
 269        unsigned allow_user_free:1;
 270        unsigned async_transaction:1;
 271        unsigned debug_id:29;
 272
 273        struct binder_transaction *transaction;
 274
 275        struct binder_node *target_node;
 276        size_t data_size;
 277        size_t offsets_size;
 278        uint8_t data[0];
 279};
 280
 281enum binder_deferred_state {
 282        BINDER_DEFERRED_PUT_FILES    = 0x01,
 283        BINDER_DEFERRED_FLUSH        = 0x02,
 284        BINDER_DEFERRED_RELEASE      = 0x04,
 285};
 286
 287struct binder_proc {
 288        struct hlist_node proc_node;
 289        struct rb_root threads;
 290        struct rb_root nodes;
 291        struct rb_root refs_by_desc;
 292        struct rb_root refs_by_node;
 293        int pid;
 294        struct vm_area_struct *vma;
 295        struct mm_struct *vma_vm_mm;
 296        struct task_struct *tsk;
 297        struct files_struct *files;
 298        struct hlist_node deferred_work_node;
 299        int deferred_work;
 300        void *buffer;
 301        ptrdiff_t user_buffer_offset;
 302
 303        struct list_head buffers;
 304        struct rb_root free_buffers;
 305        struct rb_root allocated_buffers;
 306        size_t free_async_space;
 307
 308        struct page **pages;
 309        size_t buffer_size;
 310        uint32_t buffer_free;
 311        struct list_head todo;
 312        wait_queue_head_t wait;
 313        struct binder_stats stats;
 314        struct list_head delivered_death;
 315        int max_threads;
 316        int requested_threads;
 317        int requested_threads_started;
 318        int ready_threads;
 319        long default_priority;
 320        struct dentry *debugfs_entry;
 321};
 322
 323enum {
 324        BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 325        BINDER_LOOPER_STATE_ENTERED     = 0x02,
 326        BINDER_LOOPER_STATE_EXITED      = 0x04,
 327        BINDER_LOOPER_STATE_INVALID     = 0x08,
 328        BINDER_LOOPER_STATE_WAITING     = 0x10,
 329        BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 330};
 331
 332struct binder_thread {
 333        struct binder_proc *proc;
 334        struct rb_node rb_node;
 335        int pid;
 336        int looper;
 337        struct binder_transaction *transaction_stack;
 338        struct list_head todo;
 339        uint32_t return_error; /* Write failed, return error code in read buf */
 340        uint32_t return_error2; /* Write failed, return error code in read */
 341                /* buffer. Used when sending a reply to a dead process that */
 342                /* we are also waiting on */
 343        wait_queue_head_t wait;
 344        struct binder_stats stats;
 345};
 346
 347struct binder_transaction {
 348        int debug_id;
 349        struct binder_work work;
 350        struct binder_thread *from;
 351        struct binder_transaction *from_parent;
 352        struct binder_proc *to_proc;
 353        struct binder_thread *to_thread;
 354        struct binder_transaction *to_parent;
 355        unsigned need_reply:1;
 356        /* unsigned is_dead:1; */       /* not used at the moment */
 357
 358        struct binder_buffer *buffer;
 359        unsigned int    code;
 360        unsigned int    flags;
 361        long    priority;
 362        long    saved_priority;
 363        kuid_t  sender_euid;
 364};
 365
 366static void
 367binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 368
 369static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 370{
 371        struct files_struct *files = proc->files;
 372        unsigned long rlim_cur;
 373        unsigned long irqs;
 374
 375        if (files == NULL)
 376                return -ESRCH;
 377
 378        if (!lock_task_sighand(proc->tsk, &irqs))
 379                return -EMFILE;
 380
 381        rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 382        unlock_task_sighand(proc->tsk, &irqs);
 383
 384        return __alloc_fd(files, 0, rlim_cur, flags);
 385}
 386
 387/*
 388 * copied from fd_install
 389 */
 390static void task_fd_install(
 391        struct binder_proc *proc, unsigned int fd, struct file *file)
 392{
 393        if (proc->files)
 394                __fd_install(proc->files, fd, file);
 395}
 396
 397/*
 398 * copied from sys_close
 399 */
 400static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 401{
 402        int retval;
 403
 404        if (proc->files == NULL)
 405                return -ESRCH;
 406
 407        retval = __close_fd(proc->files, fd);
 408        /* can't restart close syscall because file table entry was cleared */
 409        if (unlikely(retval == -ERESTARTSYS ||
 410                     retval == -ERESTARTNOINTR ||
 411                     retval == -ERESTARTNOHAND ||
 412                     retval == -ERESTART_RESTARTBLOCK))
 413                retval = -EINTR;
 414
 415        return retval;
 416}
 417
 418static inline void binder_lock(const char *tag)
 419{
 420        trace_binder_lock(tag);
 421        mutex_lock(&binder_main_lock);
 422        trace_binder_locked(tag);
 423}
 424
 425static inline void binder_unlock(const char *tag)
 426{
 427        trace_binder_unlock(tag);
 428        mutex_unlock(&binder_main_lock);
 429}
 430
 431static void binder_set_nice(long nice)
 432{
 433        long min_nice;
 434        if (can_nice(current, nice)) {
 435                set_user_nice(current, nice);
 436                return;
 437        }
 438        min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
 439        binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 440                     "%d: nice value %ld not allowed use %ld instead\n",
 441                      current->pid, nice, min_nice);
 442        set_user_nice(current, min_nice);
 443        if (min_nice < 20)
 444                return;
 445        binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 446}
 447
 448static size_t binder_buffer_size(struct binder_proc *proc,
 449                                 struct binder_buffer *buffer)
 450{
 451        if (list_is_last(&buffer->entry, &proc->buffers))
 452                return proc->buffer + proc->buffer_size - (void *)buffer->data;
 453        else
 454                return (size_t)list_entry(buffer->entry.next,
 455                        struct binder_buffer, entry) - (size_t)buffer->data;
 456}
 457
 458static void binder_insert_free_buffer(struct binder_proc *proc,
 459                                      struct binder_buffer *new_buffer)
 460{
 461        struct rb_node **p = &proc->free_buffers.rb_node;
 462        struct rb_node *parent = NULL;
 463        struct binder_buffer *buffer;
 464        size_t buffer_size;
 465        size_t new_buffer_size;
 466
 467        BUG_ON(!new_buffer->free);
 468
 469        new_buffer_size = binder_buffer_size(proc, new_buffer);
 470
 471        binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 472                     "%d: add free buffer, size %zd, at %p\n",
 473                      proc->pid, new_buffer_size, new_buffer);
 474
 475        while (*p) {
 476                parent = *p;
 477                buffer = rb_entry(parent, struct binder_buffer, rb_node);
 478                BUG_ON(!buffer->free);
 479
 480                buffer_size = binder_buffer_size(proc, buffer);
 481
 482                if (new_buffer_size < buffer_size)
 483                        p = &parent->rb_left;
 484                else
 485                        p = &parent->rb_right;
 486        }
 487        rb_link_node(&new_buffer->rb_node, parent, p);
 488        rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 489}
 490
 491static void binder_insert_allocated_buffer(struct binder_proc *proc,
 492                                           struct binder_buffer *new_buffer)
 493{
 494        struct rb_node **p = &proc->allocated_buffers.rb_node;
 495        struct rb_node *parent = NULL;
 496        struct binder_buffer *buffer;
 497
 498        BUG_ON(new_buffer->free);
 499
 500        while (*p) {
 501                parent = *p;
 502                buffer = rb_entry(parent, struct binder_buffer, rb_node);
 503                BUG_ON(buffer->free);
 504
 505                if (new_buffer < buffer)
 506                        p = &parent->rb_left;
 507                else if (new_buffer > buffer)
 508                        p = &parent->rb_right;
 509                else
 510                        BUG();
 511        }
 512        rb_link_node(&new_buffer->rb_node, parent, p);
 513        rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 514}
 515
 516static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 517                                                  void __user *user_ptr)
 518{
 519        struct rb_node *n = proc->allocated_buffers.rb_node;
 520        struct binder_buffer *buffer;
 521        struct binder_buffer *kern_ptr;
 522
 523        kern_ptr = user_ptr - proc->user_buffer_offset
 524                - offsetof(struct binder_buffer, data);
 525
 526        while (n) {
 527                buffer = rb_entry(n, struct binder_buffer, rb_node);
 528                BUG_ON(buffer->free);
 529
 530                if (kern_ptr < buffer)
 531                        n = n->rb_left;
 532                else if (kern_ptr > buffer)
 533                        n = n->rb_right;
 534                else
 535                        return buffer;
 536        }
 537        return NULL;
 538}
 539
 540static int binder_update_page_range(struct binder_proc *proc, int allocate,
 541                                    void *start, void *end,
 542                                    struct vm_area_struct *vma)
 543{
 544        void *page_addr;
 545        unsigned long user_page_addr;
 546        struct vm_struct tmp_area;
 547        struct page **page;
 548        struct mm_struct *mm;
 549
 550        binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 551                     "%d: %s pages %p-%p\n", proc->pid,
 552                     allocate ? "allocate" : "free", start, end);
 553
 554        if (end <= start)
 555                return 0;
 556
 557        trace_binder_update_page_range(proc, allocate, start, end);
 558
 559        if (vma)
 560                mm = NULL;
 561        else
 562                mm = get_task_mm(proc->tsk);
 563
 564        if (mm) {
 565                down_write(&mm->mmap_sem);
 566                vma = proc->vma;
 567                if (vma && mm != proc->vma_vm_mm) {
 568                        pr_err("%d: vma mm and task mm mismatch\n",
 569                                proc->pid);
 570                        vma = NULL;
 571                }
 572        }
 573
 574        if (allocate == 0)
 575                goto free_range;
 576
 577        if (vma == NULL) {
 578                pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 579                        proc->pid);
 580                goto err_no_vma;
 581        }
 582
 583        for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 584                int ret;
 585                struct page **page_array_ptr;
 586                page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 587
 588                BUG_ON(*page);
 589                *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 590                if (*page == NULL) {
 591                        pr_err("%d: binder_alloc_buf failed for page at %p\n",
 592                                proc->pid, page_addr);
 593                        goto err_alloc_page_failed;
 594                }
 595                tmp_area.addr = page_addr;
 596                tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
 597                page_array_ptr = page;
 598                ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
 599                if (ret) {
 600                        pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
 601                               proc->pid, page_addr);
 602                        goto err_map_kernel_failed;
 603                }
 604                user_page_addr =
 605                        (uintptr_t)page_addr + proc->user_buffer_offset;
 606                ret = vm_insert_page(vma, user_page_addr, page[0]);
 607                if (ret) {
 608                        pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 609                               proc->pid, user_page_addr);
 610                        goto err_vm_insert_page_failed;
 611                }
 612                /* vm_insert_page does not seem to increment the refcount */
 613        }
 614        if (mm) {
 615                up_write(&mm->mmap_sem);
 616                mmput(mm);
 617        }
 618        return 0;
 619
 620free_range:
 621        for (page_addr = end - PAGE_SIZE; page_addr >= start;
 622             page_addr -= PAGE_SIZE) {
 623                page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 624                if (vma)
 625                        zap_page_range(vma, (uintptr_t)page_addr +
 626                                proc->user_buffer_offset, PAGE_SIZE, NULL);
 627err_vm_insert_page_failed:
 628                unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 629err_map_kernel_failed:
 630                __free_page(*page);
 631                *page = NULL;
 632err_alloc_page_failed:
 633                ;
 634        }
 635err_no_vma:
 636        if (mm) {
 637                up_write(&mm->mmap_sem);
 638                mmput(mm);
 639        }
 640        return -ENOMEM;
 641}
 642
 643static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 644                                              size_t data_size,
 645                                              size_t offsets_size, int is_async)
 646{
 647        struct rb_node *n = proc->free_buffers.rb_node;
 648        struct binder_buffer *buffer;
 649        size_t buffer_size;
 650        struct rb_node *best_fit = NULL;
 651        void *has_page_addr;
 652        void *end_page_addr;
 653        size_t size;
 654
 655        if (proc->vma == NULL) {
 656                pr_err("%d: binder_alloc_buf, no vma\n",
 657                       proc->pid);
 658                return NULL;
 659        }
 660
 661        size = ALIGN(data_size, sizeof(void *)) +
 662                ALIGN(offsets_size, sizeof(void *));
 663
 664        if (size < data_size || size < offsets_size) {
 665                binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 666                                proc->pid, data_size, offsets_size);
 667                return NULL;
 668        }
 669
 670        if (is_async &&
 671            proc->free_async_space < size + sizeof(struct binder_buffer)) {
 672                binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 673                             "%d: binder_alloc_buf size %zd failed, no async space left\n",
 674                              proc->pid, size);
 675                return NULL;
 676        }
 677
 678        while (n) {
 679                buffer = rb_entry(n, struct binder_buffer, rb_node);
 680                BUG_ON(!buffer->free);
 681                buffer_size = binder_buffer_size(proc, buffer);
 682
 683                if (size < buffer_size) {
 684                        best_fit = n;
 685                        n = n->rb_left;
 686                } else if (size > buffer_size)
 687                        n = n->rb_right;
 688                else {
 689                        best_fit = n;
 690                        break;
 691                }
 692        }
 693        if (best_fit == NULL) {
 694                pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 695                        proc->pid, size);
 696                return NULL;
 697        }
 698        if (n == NULL) {
 699                buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 700                buffer_size = binder_buffer_size(proc, buffer);
 701        }
 702
 703        binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 704                     "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
 705                      proc->pid, size, buffer, buffer_size);
 706
 707        has_page_addr =
 708                (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 709        if (n == NULL) {
 710                if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 711                        buffer_size = size; /* no room for other buffers */
 712                else
 713                        buffer_size = size + sizeof(struct binder_buffer);
 714        }
 715        end_page_addr =
 716                (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 717        if (end_page_addr > has_page_addr)
 718                end_page_addr = has_page_addr;
 719        if (binder_update_page_range(proc, 1,
 720            (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 721                return NULL;
 722
 723        rb_erase(best_fit, &proc->free_buffers);
 724        buffer->free = 0;
 725        binder_insert_allocated_buffer(proc, buffer);
 726        if (buffer_size != size) {
 727                struct binder_buffer *new_buffer = (void *)buffer->data + size;
 728                list_add(&new_buffer->entry, &buffer->entry);
 729                new_buffer->free = 1;
 730                binder_insert_free_buffer(proc, new_buffer);
 731        }
 732        binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 733                     "%d: binder_alloc_buf size %zd got %p\n",
 734                      proc->pid, size, buffer);
 735        buffer->data_size = data_size;
 736        buffer->offsets_size = offsets_size;
 737        buffer->async_transaction = is_async;
 738        if (is_async) {
 739                proc->free_async_space -= size + sizeof(struct binder_buffer);
 740                binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 741                             "%d: binder_alloc_buf size %zd async free %zd\n",
 742                              proc->pid, size, proc->free_async_space);
 743        }
 744
 745        return buffer;
 746}
 747
 748static void *buffer_start_page(struct binder_buffer *buffer)
 749{
 750        return (void *)((uintptr_t)buffer & PAGE_MASK);
 751}
 752
 753static void *buffer_end_page(struct binder_buffer *buffer)
 754{
 755        return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 756}
 757
 758static void binder_delete_free_buffer(struct binder_proc *proc,
 759                                      struct binder_buffer *buffer)
 760{
 761        struct binder_buffer *prev, *next = NULL;
 762        int free_page_end = 1;
 763        int free_page_start = 1;
 764
 765        BUG_ON(proc->buffers.next == &buffer->entry);
 766        prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 767        BUG_ON(!prev->free);
 768        if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 769                free_page_start = 0;
 770                if (buffer_end_page(prev) == buffer_end_page(buffer))
 771                        free_page_end = 0;
 772                binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 773                             "%d: merge free, buffer %p share page with %p\n",
 774                              proc->pid, buffer, prev);
 775        }
 776
 777        if (!list_is_last(&buffer->entry, &proc->buffers)) {
 778                next = list_entry(buffer->entry.next,
 779                                  struct binder_buffer, entry);
 780                if (buffer_start_page(next) == buffer_end_page(buffer)) {
 781                        free_page_end = 0;
 782                        if (buffer_start_page(next) ==
 783                            buffer_start_page(buffer))
 784                                free_page_start = 0;
 785                        binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 786                                     "%d: merge free, buffer %p share page with %p\n",
 787                                      proc->pid, buffer, prev);
 788                }
 789        }
 790        list_del(&buffer->entry);
 791        if (free_page_start || free_page_end) {
 792                binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 793                             "%d: merge free, buffer %p do not share page%s%s with with %p or %p\n",
 794                             proc->pid, buffer, free_page_start ? "" : " end",
 795                             free_page_end ? "" : " start", prev, next);
 796                binder_update_page_range(proc, 0, free_page_start ?
 797                        buffer_start_page(buffer) : buffer_end_page(buffer),
 798                        (free_page_end ? buffer_end_page(buffer) :
 799                        buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 800        }
 801}
 802
 803static void binder_free_buf(struct binder_proc *proc,
 804                            struct binder_buffer *buffer)
 805{
 806        size_t size, buffer_size;
 807
 808        buffer_size = binder_buffer_size(proc, buffer);
 809
 810        size = ALIGN(buffer->data_size, sizeof(void *)) +
 811                ALIGN(buffer->offsets_size, sizeof(void *));
 812
 813        binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 814                     "%d: binder_free_buf %p size %zd buffer_size %zd\n",
 815                      proc->pid, buffer, size, buffer_size);
 816
 817        BUG_ON(buffer->free);
 818        BUG_ON(size > buffer_size);
 819        BUG_ON(buffer->transaction != NULL);
 820        BUG_ON((void *)buffer < proc->buffer);
 821        BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 822
 823        if (buffer->async_transaction) {
 824                proc->free_async_space += size + sizeof(struct binder_buffer);
 825
 826                binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 827                             "%d: binder_free_buf size %zd async free %zd\n",
 828                              proc->pid, size, proc->free_async_space);
 829        }
 830
 831        binder_update_page_range(proc, 0,
 832                (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 833                (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 834                NULL);
 835        rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 836        buffer->free = 1;
 837        if (!list_is_last(&buffer->entry, &proc->buffers)) {
 838                struct binder_buffer *next = list_entry(buffer->entry.next,
 839                                                struct binder_buffer, entry);
 840                if (next->free) {
 841                        rb_erase(&next->rb_node, &proc->free_buffers);
 842                        binder_delete_free_buffer(proc, next);
 843                }
 844        }
 845        if (proc->buffers.next != &buffer->entry) {
 846                struct binder_buffer *prev = list_entry(buffer->entry.prev,
 847                                                struct binder_buffer, entry);
 848                if (prev->free) {
 849                        binder_delete_free_buffer(proc, buffer);
 850                        rb_erase(&prev->rb_node, &proc->free_buffers);
 851                        buffer = prev;
 852                }
 853        }
 854        binder_insert_free_buffer(proc, buffer);
 855}
 856
 857static struct binder_node *binder_get_node(struct binder_proc *proc,
 858                                           void __user *ptr)
 859{
 860        struct rb_node *n = proc->nodes.rb_node;
 861        struct binder_node *node;
 862
 863        while (n) {
 864                node = rb_entry(n, struct binder_node, rb_node);
 865
 866                if (ptr < node->ptr)
 867                        n = n->rb_left;
 868                else if (ptr > node->ptr)
 869                        n = n->rb_right;
 870                else
 871                        return node;
 872        }
 873        return NULL;
 874}
 875
 876static struct binder_node *binder_new_node(struct binder_proc *proc,
 877                                           void __user *ptr,
 878                                           void __user *cookie)
 879{
 880        struct rb_node **p = &proc->nodes.rb_node;
 881        struct rb_node *parent = NULL;
 882        struct binder_node *node;
 883
 884        while (*p) {
 885                parent = *p;
 886                node = rb_entry(parent, struct binder_node, rb_node);
 887
 888                if (ptr < node->ptr)
 889                        p = &(*p)->rb_left;
 890                else if (ptr > node->ptr)
 891                        p = &(*p)->rb_right;
 892                else
 893                        return NULL;
 894        }
 895
 896        node = kzalloc(sizeof(*node), GFP_KERNEL);
 897        if (node == NULL)
 898                return NULL;
 899        binder_stats_created(BINDER_STAT_NODE);
 900        rb_link_node(&node->rb_node, parent, p);
 901        rb_insert_color(&node->rb_node, &proc->nodes);
 902        node->debug_id = ++binder_last_id;
 903        node->proc = proc;
 904        node->ptr = ptr;
 905        node->cookie = cookie;
 906        node->work.type = BINDER_WORK_NODE;
 907        INIT_LIST_HEAD(&node->work.entry);
 908        INIT_LIST_HEAD(&node->async_todo);
 909        binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 910                     "%d:%d node %d u%p c%p created\n",
 911                     proc->pid, current->pid, node->debug_id,
 912                     node->ptr, node->cookie);
 913        return node;
 914}
 915
 916static int binder_inc_node(struct binder_node *node, int strong, int internal,
 917                           struct list_head *target_list)
 918{
 919        if (strong) {
 920                if (internal) {
 921                        if (target_list == NULL &&
 922                            node->internal_strong_refs == 0 &&
 923                            !(node == binder_context_mgr_node &&
 924                            node->has_strong_ref)) {
 925                                pr_err("invalid inc strong node for %d\n",
 926                                        node->debug_id);
 927                                return -EINVAL;
 928                        }
 929                        node->internal_strong_refs++;
 930                } else
 931                        node->local_strong_refs++;
 932                if (!node->has_strong_ref && target_list) {
 933                        list_del_init(&node->work.entry);
 934                        list_add_tail(&node->work.entry, target_list);
 935                }
 936        } else {
 937                if (!internal)
 938                        node->local_weak_refs++;
 939                if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 940                        if (target_list == NULL) {
 941                                pr_err("invalid inc weak node for %d\n",
 942                                        node->debug_id);
 943                                return -EINVAL;
 944                        }
 945                        list_add_tail(&node->work.entry, target_list);
 946                }
 947        }
 948        return 0;
 949}
 950
 951static int binder_dec_node(struct binder_node *node, int strong, int internal)
 952{
 953        if (strong) {
 954                if (internal)
 955                        node->internal_strong_refs--;
 956                else
 957                        node->local_strong_refs--;
 958                if (node->local_strong_refs || node->internal_strong_refs)
 959                        return 0;
 960        } else {
 961                if (!internal)
 962                        node->local_weak_refs--;
 963                if (node->local_weak_refs || !hlist_empty(&node->refs))
 964                        return 0;
 965        }
 966        if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 967                if (list_empty(&node->work.entry)) {
 968                        list_add_tail(&node->work.entry, &node->proc->todo);
 969                        wake_up_interruptible(&node->proc->wait);
 970                }
 971        } else {
 972                if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 973                    !node->local_weak_refs) {
 974                        list_del_init(&node->work.entry);
 975                        if (node->proc) {
 976                                rb_erase(&node->rb_node, &node->proc->nodes);
 977                                binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 978                                             "refless node %d deleted\n",
 979                                             node->debug_id);
 980                        } else {
 981                                hlist_del(&node->dead_node);
 982                                binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 983                                             "dead node %d deleted\n",
 984                                             node->debug_id);
 985                        }
 986                        kfree(node);
 987                        binder_stats_deleted(BINDER_STAT_NODE);
 988                }
 989        }
 990
 991        return 0;
 992}
 993
 994
 995static struct binder_ref *binder_get_ref(struct binder_proc *proc,
 996                                         uint32_t desc)
 997{
 998        struct rb_node *n = proc->refs_by_desc.rb_node;
 999        struct binder_ref *ref;
1000
1001        while (n) {
1002                ref = rb_entry(n, struct binder_ref, rb_node_desc);
1003
1004                if (desc < ref->desc)
1005                        n = n->rb_left;
1006                else if (desc > ref->desc)
1007                        n = n->rb_right;
1008                else
1009                        return ref;
1010        }
1011        return NULL;
1012}
1013
1014static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1015                                                  struct binder_node *node)
1016{
1017        struct rb_node *n;
1018        struct rb_node **p = &proc->refs_by_node.rb_node;
1019        struct rb_node *parent = NULL;
1020        struct binder_ref *ref, *new_ref;
1021
1022        while (*p) {
1023                parent = *p;
1024                ref = rb_entry(parent, struct binder_ref, rb_node_node);
1025
1026                if (node < ref->node)
1027                        p = &(*p)->rb_left;
1028                else if (node > ref->node)
1029                        p = &(*p)->rb_right;
1030                else
1031                        return ref;
1032        }
1033        new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1034        if (new_ref == NULL)
1035                return NULL;
1036        binder_stats_created(BINDER_STAT_REF);
1037        new_ref->debug_id = ++binder_last_id;
1038        new_ref->proc = proc;
1039        new_ref->node = node;
1040        rb_link_node(&new_ref->rb_node_node, parent, p);
1041        rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1042
1043        new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1044        for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1045                ref = rb_entry(n, struct binder_ref, rb_node_desc);
1046                if (ref->desc > new_ref->desc)
1047                        break;
1048                new_ref->desc = ref->desc + 1;
1049        }
1050
1051        p = &proc->refs_by_desc.rb_node;
1052        while (*p) {
1053                parent = *p;
1054                ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1055
1056                if (new_ref->desc < ref->desc)
1057                        p = &(*p)->rb_left;
1058                else if (new_ref->desc > ref->desc)
1059                        p = &(*p)->rb_right;
1060                else
1061                        BUG();
1062        }
1063        rb_link_node(&new_ref->rb_node_desc, parent, p);
1064        rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1065        if (node) {
1066                hlist_add_head(&new_ref->node_entry, &node->refs);
1067
1068                binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1069                             "%d new ref %d desc %d for node %d\n",
1070                              proc->pid, new_ref->debug_id, new_ref->desc,
1071                              node->debug_id);
1072        } else {
1073                binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1074                             "%d new ref %d desc %d for dead node\n",
1075                              proc->pid, new_ref->debug_id, new_ref->desc);
1076        }
1077        return new_ref;
1078}
1079
1080static void binder_delete_ref(struct binder_ref *ref)
1081{
1082        binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1083                     "%d delete ref %d desc %d for node %d\n",
1084                      ref->proc->pid, ref->debug_id, ref->desc,
1085                      ref->node->debug_id);
1086
1087        rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1088        rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1089        if (ref->strong)
1090                binder_dec_node(ref->node, 1, 1);
1091        hlist_del(&ref->node_entry);
1092        binder_dec_node(ref->node, 0, 1);
1093        if (ref->death) {
1094                binder_debug(BINDER_DEBUG_DEAD_BINDER,
1095                             "%d delete ref %d desc %d has death notification\n",
1096                              ref->proc->pid, ref->debug_id, ref->desc);
1097                list_del(&ref->death->work.entry);
1098                kfree(ref->death);
1099                binder_stats_deleted(BINDER_STAT_DEATH);
1100        }
1101        kfree(ref);
1102        binder_stats_deleted(BINDER_STAT_REF);
1103}
1104
1105static int binder_inc_ref(struct binder_ref *ref, int strong,
1106                          struct list_head *target_list)
1107{
1108        int ret;
1109        if (strong) {
1110                if (ref->strong == 0) {
1111                        ret = binder_inc_node(ref->node, 1, 1, target_list);
1112                        if (ret)
1113                                return ret;
1114                }
1115                ref->strong++;
1116        } else {
1117                if (ref->weak == 0) {
1118                        ret = binder_inc_node(ref->node, 0, 1, target_list);
1119                        if (ret)
1120                                return ret;
1121                }
1122                ref->weak++;
1123        }
1124        return 0;
1125}
1126
1127
1128static int binder_dec_ref(struct binder_ref *ref, int strong)
1129{
1130        if (strong) {
1131                if (ref->strong == 0) {
1132                        binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1133                                          ref->proc->pid, ref->debug_id,
1134                                          ref->desc, ref->strong, ref->weak);
1135                        return -EINVAL;
1136                }
1137                ref->strong--;
1138                if (ref->strong == 0) {
1139                        int ret;
1140                        ret = binder_dec_node(ref->node, strong, 1);
1141                        if (ret)
1142                                return ret;
1143                }
1144        } else {
1145                if (ref->weak == 0) {
1146                        binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1147                                          ref->proc->pid, ref->debug_id,
1148                                          ref->desc, ref->strong, ref->weak);
1149                        return -EINVAL;
1150                }
1151                ref->weak--;
1152        }
1153        if (ref->strong == 0 && ref->weak == 0)
1154                binder_delete_ref(ref);
1155        return 0;
1156}
1157
1158static void binder_pop_transaction(struct binder_thread *target_thread,
1159                                   struct binder_transaction *t)
1160{
1161        if (target_thread) {
1162                BUG_ON(target_thread->transaction_stack != t);
1163                BUG_ON(target_thread->transaction_stack->from != target_thread);
1164                target_thread->transaction_stack =
1165                        target_thread->transaction_stack->from_parent;
1166                t->from = NULL;
1167        }
1168        t->need_reply = 0;
1169        if (t->buffer)
1170                t->buffer->transaction = NULL;
1171        kfree(t);
1172        binder_stats_deleted(BINDER_STAT_TRANSACTION);
1173}
1174
1175static void binder_send_failed_reply(struct binder_transaction *t,
1176                                     uint32_t error_code)
1177{
1178        struct binder_thread *target_thread;
1179        BUG_ON(t->flags & TF_ONE_WAY);
1180        while (1) {
1181                target_thread = t->from;
1182                if (target_thread) {
1183                        if (target_thread->return_error != BR_OK &&
1184                           target_thread->return_error2 == BR_OK) {
1185                                target_thread->return_error2 =
1186                                        target_thread->return_error;
1187                                target_thread->return_error = BR_OK;
1188                        }
1189                        if (target_thread->return_error == BR_OK) {
1190                                binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1191                                             "send failed reply for transaction %d to %d:%d\n",
1192                                              t->debug_id, target_thread->proc->pid,
1193                                              target_thread->pid);
1194
1195                                binder_pop_transaction(target_thread, t);
1196                                target_thread->return_error = error_code;
1197                                wake_up_interruptible(&target_thread->wait);
1198                        } else {
1199                                pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1200                                        target_thread->proc->pid,
1201                                        target_thread->pid,
1202                                        target_thread->return_error);
1203                        }
1204                        return;
1205                } else {
1206                        struct binder_transaction *next = t->from_parent;
1207
1208                        binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1209                                     "send failed reply for transaction %d, target dead\n",
1210                                     t->debug_id);
1211
1212                        binder_pop_transaction(target_thread, t);
1213                        if (next == NULL) {
1214                                binder_debug(BINDER_DEBUG_DEAD_BINDER,
1215                                             "reply failed, no target thread at root\n");
1216                                return;
1217                        }
1218                        t = next;
1219                        binder_debug(BINDER_DEBUG_DEAD_BINDER,
1220                                     "reply failed, no target thread -- retry %d\n",
1221                                      t->debug_id);
1222                }
1223        }
1224}
1225
1226static void binder_transaction_buffer_release(struct binder_proc *proc,
1227                                              struct binder_buffer *buffer,
1228                                              size_t *failed_at)
1229{
1230        size_t *offp, *off_end;
1231        int debug_id = buffer->debug_id;
1232
1233        binder_debug(BINDER_DEBUG_TRANSACTION,
1234                     "%d buffer release %d, size %zd-%zd, failed at %p\n",
1235                     proc->pid, buffer->debug_id,
1236                     buffer->data_size, buffer->offsets_size, failed_at);
1237
1238        if (buffer->target_node)
1239                binder_dec_node(buffer->target_node, 1, 0);
1240
1241        offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1242        if (failed_at)
1243                off_end = failed_at;
1244        else
1245                off_end = (void *)offp + buffer->offsets_size;
1246        for (; offp < off_end; offp++) {
1247                struct flat_binder_object *fp;
1248                if (*offp > buffer->data_size - sizeof(*fp) ||
1249                    buffer->data_size < sizeof(*fp) ||
1250                    !IS_ALIGNED(*offp, sizeof(void *))) {
1251                        pr_err("transaction release %d bad offset %zd, size %zd\n",
1252                         debug_id, *offp, buffer->data_size);
1253                        continue;
1254                }
1255                fp = (struct flat_binder_object *)(buffer->data + *offp);
1256                switch (fp->type) {
1257                case BINDER_TYPE_BINDER:
1258                case BINDER_TYPE_WEAK_BINDER: {
1259                        struct binder_node *node = binder_get_node(proc, fp->binder);
1260                        if (node == NULL) {
1261                                pr_err("transaction release %d bad node %p\n",
1262                                        debug_id, fp->binder);
1263                                break;
1264                        }
1265                        binder_debug(BINDER_DEBUG_TRANSACTION,
1266                                     "        node %d u%p\n",
1267                                     node->debug_id, node->ptr);
1268                        binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1269                } break;
1270                case BINDER_TYPE_HANDLE:
1271                case BINDER_TYPE_WEAK_HANDLE: {
1272                        struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1273                        if (ref == NULL) {
1274                                pr_err("transaction release %d bad handle %ld\n",
1275                                 debug_id, fp->handle);
1276                                break;
1277                        }
1278                        binder_debug(BINDER_DEBUG_TRANSACTION,
1279                                     "        ref %d desc %d (node %d)\n",
1280                                     ref->debug_id, ref->desc, ref->node->debug_id);
1281                        binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1282                } break;
1283
1284                case BINDER_TYPE_FD:
1285                        binder_debug(BINDER_DEBUG_TRANSACTION,
1286                                     "        fd %ld\n", fp->handle);
1287                        if (failed_at)
1288                                task_close_fd(proc, fp->handle);
1289                        break;
1290
1291                default:
1292                        pr_err("transaction release %d bad object type %lx\n",
1293                                debug_id, fp->type);
1294                        break;
1295                }
1296        }
1297}
1298
1299static void binder_transaction(struct binder_proc *proc,
1300                               struct binder_thread *thread,
1301                               struct binder_transaction_data *tr, int reply)
1302{
1303        struct binder_transaction *t;
1304        struct binder_work *tcomplete;
1305        size_t *offp, *off_end;
1306        struct binder_proc *target_proc;
1307        struct binder_thread *target_thread = NULL;
1308        struct binder_node *target_node = NULL;
1309        struct list_head *target_list;
1310        wait_queue_head_t *target_wait;
1311        struct binder_transaction *in_reply_to = NULL;
1312        struct binder_transaction_log_entry *e;
1313        uint32_t return_error;
1314
1315        e = binder_transaction_log_add(&binder_transaction_log);
1316        e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1317        e->from_proc = proc->pid;
1318        e->from_thread = thread->pid;
1319        e->target_handle = tr->target.handle;
1320        e->data_size = tr->data_size;
1321        e->offsets_size = tr->offsets_size;
1322
1323        if (reply) {
1324                in_reply_to = thread->transaction_stack;
1325                if (in_reply_to == NULL) {
1326                        binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1327                                          proc->pid, thread->pid);
1328                        return_error = BR_FAILED_REPLY;
1329                        goto err_empty_call_stack;
1330                }
1331                binder_set_nice(in_reply_to->saved_priority);
1332                if (in_reply_to->to_thread != thread) {
1333                        binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1334                                proc->pid, thread->pid, in_reply_to->debug_id,
1335                                in_reply_to->to_proc ?
1336                                in_reply_to->to_proc->pid : 0,
1337                                in_reply_to->to_thread ?
1338                                in_reply_to->to_thread->pid : 0);
1339                        return_error = BR_FAILED_REPLY;
1340                        in_reply_to = NULL;
1341                        goto err_bad_call_stack;
1342                }
1343                thread->transaction_stack = in_reply_to->to_parent;
1344                target_thread = in_reply_to->from;
1345                if (target_thread == NULL) {
1346                        return_error = BR_DEAD_REPLY;
1347                        goto err_dead_binder;
1348                }
1349                if (target_thread->transaction_stack != in_reply_to) {
1350                        binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1351                                proc->pid, thread->pid,
1352                                target_thread->transaction_stack ?
1353                                target_thread->transaction_stack->debug_id : 0,
1354                                in_reply_to->debug_id);
1355                        return_error = BR_FAILED_REPLY;
1356                        in_reply_to = NULL;
1357                        target_thread = NULL;
1358                        goto err_dead_binder;
1359                }
1360                target_proc = target_thread->proc;
1361        } else {
1362                if (tr->target.handle) {
1363                        struct binder_ref *ref;
1364                        ref = binder_get_ref(proc, tr->target.handle);
1365                        if (ref == NULL) {
1366                                binder_user_error("%d:%d got transaction to invalid handle\n",
1367                                        proc->pid, thread->pid);
1368                                return_error = BR_FAILED_REPLY;
1369                                goto err_invalid_target_handle;
1370                        }
1371                        target_node = ref->node;
1372                } else {
1373                        target_node = binder_context_mgr_node;
1374                        if (target_node == NULL) {
1375                                return_error = BR_DEAD_REPLY;
1376                                goto err_no_context_mgr_node;
1377                        }
1378                }
1379                e->to_node = target_node->debug_id;
1380                target_proc = target_node->proc;
1381                if (target_proc == NULL) {
1382                        return_error = BR_DEAD_REPLY;
1383                        goto err_dead_binder;
1384                }
1385                if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1386                        struct binder_transaction *tmp;
1387                        tmp = thread->transaction_stack;
1388                        if (tmp->to_thread != thread) {
1389                                binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1390                                        proc->pid, thread->pid, tmp->debug_id,
1391                                        tmp->to_proc ? tmp->to_proc->pid : 0,
1392                                        tmp->to_thread ?
1393                                        tmp->to_thread->pid : 0);
1394                                return_error = BR_FAILED_REPLY;
1395                                goto err_bad_call_stack;
1396                        }
1397                        while (tmp) {
1398                                if (tmp->from && tmp->from->proc == target_proc)
1399                                        target_thread = tmp->from;
1400                                tmp = tmp->from_parent;
1401                        }
1402                }
1403        }
1404        if (target_thread) {
1405                e->to_thread = target_thread->pid;
1406                target_list = &target_thread->todo;
1407                target_wait = &target_thread->wait;
1408        } else {
1409                target_list = &target_proc->todo;
1410                target_wait = &target_proc->wait;
1411        }
1412        e->to_proc = target_proc->pid;
1413
1414        /* TODO: reuse incoming transaction for reply */
1415        t = kzalloc(sizeof(*t), GFP_KERNEL);
1416        if (t == NULL) {
1417                return_error = BR_FAILED_REPLY;
1418                goto err_alloc_t_failed;
1419        }
1420        binder_stats_created(BINDER_STAT_TRANSACTION);
1421
1422        tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1423        if (tcomplete == NULL) {
1424                return_error = BR_FAILED_REPLY;
1425                goto err_alloc_tcomplete_failed;
1426        }
1427        binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1428
1429        t->debug_id = ++binder_last_id;
1430        e->debug_id = t->debug_id;
1431
1432        if (reply)
1433                binder_debug(BINDER_DEBUG_TRANSACTION,
1434                             "%d:%d BC_REPLY %d -> %d:%d, data %p-%p size %zd-%zd\n",
1435                             proc->pid, thread->pid, t->debug_id,
1436                             target_proc->pid, target_thread->pid,
1437                             tr->data.ptr.buffer, tr->data.ptr.offsets,
1438                             tr->data_size, tr->offsets_size);
1439        else
1440                binder_debug(BINDER_DEBUG_TRANSACTION,
1441                             "%d:%d BC_TRANSACTION %d -> %d - node %d, data %p-%p size %zd-%zd\n",
1442                             proc->pid, thread->pid, t->debug_id,
1443                             target_proc->pid, target_node->debug_id,
1444                             tr->data.ptr.buffer, tr->data.ptr.offsets,
1445                             tr->data_size, tr->offsets_size);
1446
1447        if (!reply && !(tr->flags & TF_ONE_WAY))
1448                t->from = thread;
1449        else
1450                t->from = NULL;
1451        t->sender_euid = proc->tsk->cred->euid;
1452        t->to_proc = target_proc;
1453        t->to_thread = target_thread;
1454        t->code = tr->code;
1455        t->flags = tr->flags;
1456        t->priority = task_nice(current);
1457
1458        trace_binder_transaction(reply, t, target_node);
1459
1460        t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1461                tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1462        if (t->buffer == NULL) {
1463                return_error = BR_FAILED_REPLY;
1464                goto err_binder_alloc_buf_failed;
1465        }
1466        t->buffer->allow_user_free = 0;
1467        t->buffer->debug_id = t->debug_id;
1468        t->buffer->transaction = t;
1469        t->buffer->target_node = target_node;
1470        trace_binder_transaction_alloc_buf(t->buffer);
1471        if (target_node)
1472                binder_inc_node(target_node, 1, 0, NULL);
1473
1474        offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1475
1476        if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1477                binder_user_error("%d:%d got transaction with invalid data ptr\n",
1478                                proc->pid, thread->pid);
1479                return_error = BR_FAILED_REPLY;
1480                goto err_copy_data_failed;
1481        }
1482        if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1483                binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1484                                proc->pid, thread->pid);
1485                return_error = BR_FAILED_REPLY;
1486                goto err_copy_data_failed;
1487        }
1488        if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
1489                binder_user_error("%d:%d got transaction with invalid offsets size, %zd\n",
1490                                proc->pid, thread->pid, tr->offsets_size);
1491                return_error = BR_FAILED_REPLY;
1492                goto err_bad_offset;
1493        }
1494        off_end = (void *)offp + tr->offsets_size;
1495        for (; offp < off_end; offp++) {
1496                struct flat_binder_object *fp;
1497                if (*offp > t->buffer->data_size - sizeof(*fp) ||
1498                    t->buffer->data_size < sizeof(*fp) ||
1499                    !IS_ALIGNED(*offp, sizeof(void *))) {
1500                        binder_user_error("%d:%d got transaction with invalid offset, %zd\n",
1501                                        proc->pid, thread->pid, *offp);
1502                        return_error = BR_FAILED_REPLY;
1503                        goto err_bad_offset;
1504                }
1505                fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1506                switch (fp->type) {
1507                case BINDER_TYPE_BINDER:
1508                case BINDER_TYPE_WEAK_BINDER: {
1509                        struct binder_ref *ref;
1510                        struct binder_node *node = binder_get_node(proc, fp->binder);
1511                        if (node == NULL) {
1512                                node = binder_new_node(proc, fp->binder, fp->cookie);
1513                                if (node == NULL) {
1514                                        return_error = BR_FAILED_REPLY;
1515                                        goto err_binder_new_node_failed;
1516                                }
1517                                node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1518                                node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1519                        }
1520                        if (fp->cookie != node->cookie) {
1521                                binder_user_error("%d:%d sending u%p node %d, cookie mismatch %p != %p\n",
1522                                        proc->pid, thread->pid,
1523                                        fp->binder, node->debug_id,
1524                                        fp->cookie, node->cookie);
1525                                goto err_binder_get_ref_for_node_failed;
1526                        }
1527                        ref = binder_get_ref_for_node(target_proc, node);
1528                        if (ref == NULL) {
1529                                return_error = BR_FAILED_REPLY;
1530                                goto err_binder_get_ref_for_node_failed;
1531                        }
1532                        if (fp->type == BINDER_TYPE_BINDER)
1533                                fp->type = BINDER_TYPE_HANDLE;
1534                        else
1535                                fp->type = BINDER_TYPE_WEAK_HANDLE;
1536                        fp->handle = ref->desc;
1537                        binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1538                                       &thread->todo);
1539
1540                        trace_binder_transaction_node_to_ref(t, node, ref);
1541                        binder_debug(BINDER_DEBUG_TRANSACTION,
1542                                     "        node %d u%p -> ref %d desc %d\n",
1543                                     node->debug_id, node->ptr, ref->debug_id,
1544                                     ref->desc);
1545                } break;
1546                case BINDER_TYPE_HANDLE:
1547                case BINDER_TYPE_WEAK_HANDLE: {
1548                        struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1549                        if (ref == NULL) {
1550                                binder_user_error("%d:%d got transaction with invalid handle, %ld\n",
1551                                                proc->pid,
1552                                                thread->pid, fp->handle);
1553                                return_error = BR_FAILED_REPLY;
1554                                goto err_binder_get_ref_failed;
1555                        }
1556                        if (ref->node->proc == target_proc) {
1557                                if (fp->type == BINDER_TYPE_HANDLE)
1558                                        fp->type = BINDER_TYPE_BINDER;
1559                                else
1560                                        fp->type = BINDER_TYPE_WEAK_BINDER;
1561                                fp->binder = ref->node->ptr;
1562                                fp->cookie = ref->node->cookie;
1563                                binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1564                                trace_binder_transaction_ref_to_node(t, ref);
1565                                binder_debug(BINDER_DEBUG_TRANSACTION,
1566                                             "        ref %d desc %d -> node %d u%p\n",
1567                                             ref->debug_id, ref->desc, ref->node->debug_id,
1568                                             ref->node->ptr);
1569                        } else {
1570                                struct binder_ref *new_ref;
1571                                new_ref = binder_get_ref_for_node(target_proc, ref->node);
1572                                if (new_ref == NULL) {
1573                                        return_error = BR_FAILED_REPLY;
1574                                        goto err_binder_get_ref_for_node_failed;
1575                                }
1576                                fp->handle = new_ref->desc;
1577                                binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1578                                trace_binder_transaction_ref_to_ref(t, ref,
1579                                                                    new_ref);
1580                                binder_debug(BINDER_DEBUG_TRANSACTION,
1581                                             "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1582                                             ref->debug_id, ref->desc, new_ref->debug_id,
1583                                             new_ref->desc, ref->node->debug_id);
1584                        }
1585                } break;
1586
1587                case BINDER_TYPE_FD: {
1588                        int target_fd;
1589                        struct file *file;
1590
1591                        if (reply) {
1592                                if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1593                                        binder_user_error("%d:%d got reply with fd, %ld, but target does not allow fds\n",
1594                                                proc->pid, thread->pid, fp->handle);
1595                                        return_error = BR_FAILED_REPLY;
1596                                        goto err_fd_not_allowed;
1597                                }
1598                        } else if (!target_node->accept_fds) {
1599                                binder_user_error("%d:%d got transaction with fd, %ld, but target does not allow fds\n",
1600                                        proc->pid, thread->pid, fp->handle);
1601                                return_error = BR_FAILED_REPLY;
1602                                goto err_fd_not_allowed;
1603                        }
1604
1605                        file = fget(fp->handle);
1606                        if (file == NULL) {
1607                                binder_user_error("%d:%d got transaction with invalid fd, %ld\n",
1608                                        proc->pid, thread->pid, fp->handle);
1609                                return_error = BR_FAILED_REPLY;
1610                                goto err_fget_failed;
1611                        }
1612                        target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1613                        if (target_fd < 0) {
1614                                fput(file);
1615                                return_error = BR_FAILED_REPLY;
1616                                goto err_get_unused_fd_failed;
1617                        }
1618                        task_fd_install(target_proc, target_fd, file);
1619                        trace_binder_transaction_fd(t, fp->handle, target_fd);
1620                        binder_debug(BINDER_DEBUG_TRANSACTION,
1621                                     "        fd %ld -> %d\n", fp->handle, target_fd);
1622                        /* TODO: fput? */
1623                        fp->handle = target_fd;
1624                } break;
1625
1626                default:
1627                        binder_user_error("%d:%d got transaction with invalid object type, %lx\n",
1628                                proc->pid, thread->pid, fp->type);
1629                        return_error = BR_FAILED_REPLY;
1630                        goto err_bad_object_type;
1631                }
1632        }
1633        if (reply) {
1634                BUG_ON(t->buffer->async_transaction != 0);
1635                binder_pop_transaction(target_thread, in_reply_to);
1636        } else if (!(t->flags & TF_ONE_WAY)) {
1637                BUG_ON(t->buffer->async_transaction != 0);
1638                t->need_reply = 1;
1639                t->from_parent = thread->transaction_stack;
1640                thread->transaction_stack = t;
1641        } else {
1642                BUG_ON(target_node == NULL);
1643                BUG_ON(t->buffer->async_transaction != 1);
1644                if (target_node->has_async_transaction) {
1645                        target_list = &target_node->async_todo;
1646                        target_wait = NULL;
1647                } else
1648                        target_node->has_async_transaction = 1;
1649        }
1650        t->work.type = BINDER_WORK_TRANSACTION;
1651        list_add_tail(&t->work.entry, target_list);
1652        tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1653        list_add_tail(&tcomplete->entry, &thread->todo);
1654        if (target_wait)
1655                wake_up_interruptible(target_wait);
1656        return;
1657
1658err_get_unused_fd_failed:
1659err_fget_failed:
1660err_fd_not_allowed:
1661err_binder_get_ref_for_node_failed:
1662err_binder_get_ref_failed:
1663err_binder_new_node_failed:
1664err_bad_object_type:
1665err_bad_offset:
1666err_copy_data_failed:
1667        trace_binder_transaction_failed_buffer_release(t->buffer);
1668        binder_transaction_buffer_release(target_proc, t->buffer, offp);
1669        t->buffer->transaction = NULL;
1670        binder_free_buf(target_proc, t->buffer);
1671err_binder_alloc_buf_failed:
1672        kfree(tcomplete);
1673        binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1674err_alloc_tcomplete_failed:
1675        kfree(t);
1676        binder_stats_deleted(BINDER_STAT_TRANSACTION);
1677err_alloc_t_failed:
1678err_bad_call_stack:
1679err_empty_call_stack:
1680err_dead_binder:
1681err_invalid_target_handle:
1682err_no_context_mgr_node:
1683        binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1684                     "%d:%d transaction failed %d, size %zd-%zd\n",
1685                     proc->pid, thread->pid, return_error,
1686                     tr->data_size, tr->offsets_size);
1687
1688        {
1689                struct binder_transaction_log_entry *fe;
1690                fe = binder_transaction_log_add(&binder_transaction_log_failed);
1691                *fe = *e;
1692        }
1693
1694        BUG_ON(thread->return_error != BR_OK);
1695        if (in_reply_to) {
1696                thread->return_error = BR_TRANSACTION_COMPLETE;
1697                binder_send_failed_reply(in_reply_to, return_error);
1698        } else
1699                thread->return_error = return_error;
1700}
1701
1702int binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
1703                        void __user *buffer, int size, signed long *consumed)
1704{
1705        uint32_t cmd;
1706        void __user *ptr = buffer + *consumed;
1707        void __user *end = buffer + size;
1708
1709        while (ptr < end && thread->return_error == BR_OK) {
1710                if (get_user(cmd, (uint32_t __user *)ptr))
1711                        return -EFAULT;
1712                ptr += sizeof(uint32_t);
1713                trace_binder_command(cmd);
1714                if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1715                        binder_stats.bc[_IOC_NR(cmd)]++;
1716                        proc->stats.bc[_IOC_NR(cmd)]++;
1717                        thread->stats.bc[_IOC_NR(cmd)]++;
1718                }
1719                switch (cmd) {
1720                case BC_INCREFS:
1721                case BC_ACQUIRE:
1722                case BC_RELEASE:
1723                case BC_DECREFS: {
1724                        uint32_t target;
1725                        struct binder_ref *ref;
1726                        const char *debug_string;
1727
1728                        if (get_user(target, (uint32_t __user *)ptr))
1729                                return -EFAULT;
1730                        ptr += sizeof(uint32_t);
1731                        if (target == 0 && binder_context_mgr_node &&
1732                            (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1733                                ref = binder_get_ref_for_node(proc,
1734                                               binder_context_mgr_node);
1735                                if (ref->desc != target) {
1736                                        binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1737                                                proc->pid, thread->pid,
1738                                                ref->desc);
1739                                }
1740                        } else
1741                                ref = binder_get_ref(proc, target);
1742                        if (ref == NULL) {
1743                                binder_user_error("%d:%d refcount change on invalid ref %d\n",
1744                                        proc->pid, thread->pid, target);
1745                                break;
1746                        }
1747                        switch (cmd) {
1748                        case BC_INCREFS:
1749                                debug_string = "IncRefs";
1750                                binder_inc_ref(ref, 0, NULL);
1751                                break;
1752                        case BC_ACQUIRE:
1753                                debug_string = "Acquire";
1754                                binder_inc_ref(ref, 1, NULL);
1755                                break;
1756                        case BC_RELEASE:
1757                                debug_string = "Release";
1758                                binder_dec_ref(ref, 1);
1759                                break;
1760                        case BC_DECREFS:
1761                        default:
1762                                debug_string = "DecRefs";
1763                                binder_dec_ref(ref, 0);
1764                                break;
1765                        }
1766                        binder_debug(BINDER_DEBUG_USER_REFS,
1767                                     "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1768                                     proc->pid, thread->pid, debug_string, ref->debug_id,
1769                                     ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1770                        break;
1771                }
1772                case BC_INCREFS_DONE:
1773                case BC_ACQUIRE_DONE: {
1774                        void __user *node_ptr;
1775                        void *cookie;
1776                        struct binder_node *node;
1777
1778                        if (get_user(node_ptr, (void * __user *)ptr))
1779                                return -EFAULT;
1780                        ptr += sizeof(void *);
1781                        if (get_user(cookie, (void * __user *)ptr))
1782                                return -EFAULT;
1783                        ptr += sizeof(void *);
1784                        node = binder_get_node(proc, node_ptr);
1785                        if (node == NULL) {
1786                                binder_user_error("%d:%d %s u%p no match\n",
1787                                        proc->pid, thread->pid,
1788                                        cmd == BC_INCREFS_DONE ?
1789                                        "BC_INCREFS_DONE" :
1790                                        "BC_ACQUIRE_DONE",
1791                                        node_ptr);
1792                                break;
1793                        }
1794                        if (cookie != node->cookie) {
1795                                binder_user_error("%d:%d %s u%p node %d cookie mismatch %p != %p\n",
1796                                        proc->pid, thread->pid,
1797                                        cmd == BC_INCREFS_DONE ?
1798                                        "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1799                                        node_ptr, node->debug_id,
1800                                        cookie, node->cookie);
1801                                break;
1802                        }
1803                        if (cmd == BC_ACQUIRE_DONE) {
1804                                if (node->pending_strong_ref == 0) {
1805                                        binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1806                                                proc->pid, thread->pid,
1807                                                node->debug_id);
1808                                        break;
1809                                }
1810                                node->pending_strong_ref = 0;
1811                        } else {
1812                                if (node->pending_weak_ref == 0) {
1813                                        binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1814                                                proc->pid, thread->pid,
1815                                                node->debug_id);
1816                                        break;
1817                                }
1818                                node->pending_weak_ref = 0;
1819                        }
1820                        binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1821                        binder_debug(BINDER_DEBUG_USER_REFS,
1822                                     "%d:%d %s node %d ls %d lw %d\n",
1823                                     proc->pid, thread->pid,
1824                                     cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1825                                     node->debug_id, node->local_strong_refs, node->local_weak_refs);
1826                        break;
1827                }
1828                case BC_ATTEMPT_ACQUIRE:
1829                        pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1830                        return -EINVAL;
1831                case BC_ACQUIRE_RESULT:
1832                        pr_err("BC_ACQUIRE_RESULT not supported\n");
1833                        return -EINVAL;
1834
1835                case BC_FREE_BUFFER: {
1836                        void __user *data_ptr;
1837                        struct binder_buffer *buffer;
1838
1839                        if (get_user(data_ptr, (void * __user *)ptr))
1840                                return -EFAULT;
1841                        ptr += sizeof(void *);
1842
1843                        buffer = binder_buffer_lookup(proc, data_ptr);
1844                        if (buffer == NULL) {
1845                                binder_user_error("%d:%d BC_FREE_BUFFER u%p no match\n",
1846                                        proc->pid, thread->pid, data_ptr);
1847                                break;
1848                        }
1849                        if (!buffer->allow_user_free) {
1850                                binder_user_error("%d:%d BC_FREE_BUFFER u%p matched unreturned buffer\n",
1851                                        proc->pid, thread->pid, data_ptr);
1852                                break;
1853                        }
1854                        binder_debug(BINDER_DEBUG_FREE_BUFFER,
1855                                     "%d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1856                                     proc->pid, thread->pid, data_ptr, buffer->debug_id,
1857                                     buffer->transaction ? "active" : "finished");
1858
1859                        if (buffer->transaction) {
1860                                buffer->transaction->buffer = NULL;
1861                                buffer->transaction = NULL;
1862                        }
1863                        if (buffer->async_transaction && buffer->target_node) {
1864                                BUG_ON(!buffer->target_node->has_async_transaction);
1865                                if (list_empty(&buffer->target_node->async_todo))
1866                                        buffer->target_node->has_async_transaction = 0;
1867                                else
1868                                        list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1869                        }
1870                        trace_binder_transaction_buffer_release(buffer);
1871                        binder_transaction_buffer_release(proc, buffer, NULL);
1872                        binder_free_buf(proc, buffer);
1873                        break;
1874                }
1875
1876                case BC_TRANSACTION:
1877                case BC_REPLY: {
1878                        struct binder_transaction_data tr;
1879
1880                        if (copy_from_user(&tr, ptr, sizeof(tr)))
1881                                return -EFAULT;
1882                        ptr += sizeof(tr);
1883                        binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1884                        break;
1885                }
1886
1887                case BC_REGISTER_LOOPER:
1888                        binder_debug(BINDER_DEBUG_THREADS,
1889                                     "%d:%d BC_REGISTER_LOOPER\n",
1890                                     proc->pid, thread->pid);
1891                        if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1892                                thread->looper |= BINDER_LOOPER_STATE_INVALID;
1893                                binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1894                                        proc->pid, thread->pid);
1895                        } else if (proc->requested_threads == 0) {
1896                                thread->looper |= BINDER_LOOPER_STATE_INVALID;
1897                                binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1898                                        proc->pid, thread->pid);
1899                        } else {
1900                                proc->requested_threads--;
1901                                proc->requested_threads_started++;
1902                        }
1903                        thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1904                        break;
1905                case BC_ENTER_LOOPER:
1906                        binder_debug(BINDER_DEBUG_THREADS,
1907                                     "%d:%d BC_ENTER_LOOPER\n",
1908                                     proc->pid, thread->pid);
1909                        if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1910                                thread->looper |= BINDER_LOOPER_STATE_INVALID;
1911                                binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1912                                        proc->pid, thread->pid);
1913                        }
1914                        thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1915                        break;
1916                case BC_EXIT_LOOPER:
1917                        binder_debug(BINDER_DEBUG_THREADS,
1918                                     "%d:%d BC_EXIT_LOOPER\n",
1919                                     proc->pid, thread->pid);
1920                        thread->looper |= BINDER_LOOPER_STATE_EXITED;
1921                        break;
1922
1923                case BC_REQUEST_DEATH_NOTIFICATION:
1924                case BC_CLEAR_DEATH_NOTIFICATION: {
1925                        uint32_t target;
1926                        void __user *cookie;
1927                        struct binder_ref *ref;
1928                        struct binder_ref_death *death;
1929
1930                        if (get_user(target, (uint32_t __user *)ptr))
1931                                return -EFAULT;
1932                        ptr += sizeof(uint32_t);
1933                        if (get_user(cookie, (void __user * __user *)ptr))
1934                                return -EFAULT;
1935                        ptr += sizeof(void *);
1936                        ref = binder_get_ref(proc, target);
1937                        if (ref == NULL) {
1938                                binder_user_error("%d:%d %s invalid ref %d\n",
1939                                        proc->pid, thread->pid,
1940                                        cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1941                                        "BC_REQUEST_DEATH_NOTIFICATION" :
1942                                        "BC_CLEAR_DEATH_NOTIFICATION",
1943                                        target);
1944                                break;
1945                        }
1946
1947                        binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
1948                                     "%d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
1949                                     proc->pid, thread->pid,
1950                                     cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1951                                     "BC_REQUEST_DEATH_NOTIFICATION" :
1952                                     "BC_CLEAR_DEATH_NOTIFICATION",
1953                                     cookie, ref->debug_id, ref->desc,
1954                                     ref->strong, ref->weak, ref->node->debug_id);
1955
1956                        if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
1957                                if (ref->death) {
1958                                        binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
1959                                                proc->pid, thread->pid);
1960                                        break;
1961                                }
1962                                death = kzalloc(sizeof(*death), GFP_KERNEL);
1963                                if (death == NULL) {
1964                                        thread->return_error = BR_ERROR;
1965                                        binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1966                                                     "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
1967                                                     proc->pid, thread->pid);
1968                                        break;
1969                                }
1970                                binder_stats_created(BINDER_STAT_DEATH);
1971                                INIT_LIST_HEAD(&death->work.entry);
1972                                death->cookie = cookie;
1973                                ref->death = death;
1974                                if (ref->node->proc == NULL) {
1975                                        ref->death->work.type = BINDER_WORK_DEAD_BINDER;
1976                                        if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
1977                                                list_add_tail(&ref->death->work.entry, &thread->todo);
1978                                        } else {
1979                                                list_add_tail(&ref->death->work.entry, &proc->todo);
1980                                                wake_up_interruptible(&proc->wait);
1981                                        }
1982                                }
1983                        } else {
1984                                if (ref->death == NULL) {
1985                                        binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
1986                                                proc->pid, thread->pid);
1987                                        break;
1988                                }
1989                                death = ref->death;
1990                                if (death->cookie != cookie) {
1991                                        binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %p != %p\n",
1992                                                proc->pid, thread->pid,
1993                                                death->cookie, cookie);
1994                                        break;
1995                                }
1996                                ref->death = NULL;
1997                                if (list_empty(&death->work.entry)) {
1998                                        death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
1999                                        if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2000                                                list_add_tail(&death->work.entry, &thread->todo);
2001                                        } else {
2002                                                list_add_tail(&death->work.entry, &proc->todo);
2003                                                wake_up_interruptible(&proc->wait);
2004                                        }
2005                                } else {
2006                                        BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2007                                        death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2008                                }
2009                        }
2010                } break;
2011                case BC_DEAD_BINDER_DONE: {
2012                        struct binder_work *w;
2013                        void __user *cookie;
2014                        struct binder_ref_death *death = NULL;
2015                        if (get_user(cookie, (void __user * __user *)ptr))
2016                                return -EFAULT;
2017
2018                        ptr += sizeof(void *);
2019                        list_for_each_entry(w, &proc->delivered_death, entry) {
2020                                struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2021                                if (tmp_death->cookie == cookie) {
2022                                        death = tmp_death;
2023                                        break;
2024                                }
2025                        }
2026                        binder_debug(BINDER_DEBUG_DEAD_BINDER,
2027                                     "%d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2028                                     proc->pid, thread->pid, cookie, death);
2029                        if (death == NULL) {
2030                                binder_user_error("%d:%d BC_DEAD_BINDER_DONE %p not found\n",
2031                                        proc->pid, thread->pid, cookie);
2032                                break;
2033                        }
2034
2035                        list_del_init(&death->work.entry);
2036                        if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2037                                death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2038                                if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2039                                        list_add_tail(&death->work.entry, &thread->todo);
2040                                } else {
2041                                        list_add_tail(&death->work.entry, &proc->todo);
2042                                        wake_up_interruptible(&proc->wait);
2043                                }
2044                        }
2045                } break;
2046
2047                default:
2048                        pr_err("%d:%d unknown command %d\n",
2049                               proc->pid, thread->pid, cmd);
2050                        return -EINVAL;
2051                }
2052                *consumed = ptr - buffer;
2053        }
2054        return 0;
2055}
2056
2057void binder_stat_br(struct binder_proc *proc, struct binder_thread *thread,
2058                    uint32_t cmd)
2059{
2060        trace_binder_return(cmd);
2061        if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2062                binder_stats.br[_IOC_NR(cmd)]++;
2063                proc->stats.br[_IOC_NR(cmd)]++;
2064                thread->stats.br[_IOC_NR(cmd)]++;
2065        }
2066}
2067
2068static int binder_has_proc_work(struct binder_proc *proc,
2069                                struct binder_thread *thread)
2070{
2071        return !list_empty(&proc->todo) ||
2072                (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2073}
2074
2075static int binder_has_thread_work(struct binder_thread *thread)
2076{
2077        return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2078                (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2079}
2080
2081static int binder_thread_read(struct binder_proc *proc,
2082                              struct binder_thread *thread,
2083                              void  __user *buffer, int size,
2084                              signed long *consumed, int non_block)
2085{
2086        void __user *ptr = buffer + *consumed;
2087        void __user *end = buffer + size;
2088
2089        int ret = 0;
2090        int wait_for_proc_work;
2091
2092        if (*consumed == 0) {
2093                if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2094                        return -EFAULT;
2095                ptr += sizeof(uint32_t);
2096        }
2097
2098retry:
2099        wait_for_proc_work = thread->transaction_stack == NULL &&
2100                                list_empty(&thread->todo);
2101
2102        if (thread->return_error != BR_OK && ptr < end) {
2103                if (thread->return_error2 != BR_OK) {
2104                        if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2105                                return -EFAULT;
2106                        ptr += sizeof(uint32_t);
2107                        binder_stat_br(proc, thread, thread->return_error2);
2108                        if (ptr == end)
2109                                goto done;
2110                        thread->return_error2 = BR_OK;
2111                }
2112                if (put_user(thread->return_error, (uint32_t __user *)ptr))
2113                        return -EFAULT;
2114                ptr += sizeof(uint32_t);
2115                binder_stat_br(proc, thread, thread->return_error);
2116                thread->return_error = BR_OK;
2117                goto done;
2118        }
2119
2120
2121        thread->looper |= BINDER_LOOPER_STATE_WAITING;
2122        if (wait_for_proc_work)
2123                proc->ready_threads++;
2124
2125        binder_unlock(__func__);
2126
2127        trace_binder_wait_for_work(wait_for_proc_work,
2128                                   !!thread->transaction_stack,
2129                                   !list_empty(&thread->todo));
2130        if (wait_for_proc_work) {
2131                if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2132                                        BINDER_LOOPER_STATE_ENTERED))) {
2133                        binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2134                                proc->pid, thread->pid, thread->looper);
2135                        wait_event_interruptible(binder_user_error_wait,
2136                                                 binder_stop_on_user_error < 2);
2137                }
2138                binder_set_nice(proc->default_priority);
2139                if (non_block) {
2140                        if (!binder_has_proc_work(proc, thread))
2141                                ret = -EAGAIN;
2142                } else
2143                        ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2144        } else {
2145                if (non_block) {
2146                        if (!binder_has_thread_work(thread))
2147                                ret = -EAGAIN;
2148                } else
2149                        ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
2150        }
2151
2152        binder_lock(__func__);
2153
2154        if (wait_for_proc_work)
2155                proc->ready_threads--;
2156        thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2157
2158        if (ret)
2159                return ret;
2160
2161        while (1) {
2162                uint32_t cmd;
2163                struct binder_transaction_data tr;
2164                struct binder_work *w;
2165                struct binder_transaction *t = NULL;
2166
2167                if (!list_empty(&thread->todo))
2168                        w = list_first_entry(&thread->todo, struct binder_work, entry);
2169                else if (!list_empty(&proc->todo) && wait_for_proc_work)
2170                        w = list_first_entry(&proc->todo, struct binder_work, entry);
2171                else {
2172                        if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2173                                goto retry;
2174                        break;
2175                }
2176
2177                if (end - ptr < sizeof(tr) + 4)
2178                        break;
2179
2180                switch (w->type) {
2181                case BINDER_WORK_TRANSACTION: {
2182                        t = container_of(w, struct binder_transaction, work);
2183                } break;
2184                case BINDER_WORK_TRANSACTION_COMPLETE: {
2185                        cmd = BR_TRANSACTION_COMPLETE;
2186                        if (put_user(cmd, (uint32_t __user *)ptr))
2187                                return -EFAULT;
2188                        ptr += sizeof(uint32_t);
2189
2190                        binder_stat_br(proc, thread, cmd);
2191                        binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2192                                     "%d:%d BR_TRANSACTION_COMPLETE\n",
2193                                     proc->pid, thread->pid);
2194
2195                        list_del(&w->entry);
2196                        kfree(w);
2197                        binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2198                } break;
2199                case BINDER_WORK_NODE: {
2200                        struct binder_node *node = container_of(w, struct binder_node, work);
2201                        uint32_t cmd = BR_NOOP;
2202                        const char *cmd_name;
2203                        int strong = node->internal_strong_refs || node->local_strong_refs;
2204                        int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2205                        if (weak && !node->has_weak_ref) {
2206                                cmd = BR_INCREFS;
2207                                cmd_name = "BR_INCREFS";
2208                                node->has_weak_ref = 1;
2209                                node->pending_weak_ref = 1;
2210                                node->local_weak_refs++;
2211                        } else if (strong && !node->has_strong_ref) {
2212                                cmd = BR_ACQUIRE;
2213                                cmd_name = "BR_ACQUIRE";
2214                                node->has_strong_ref = 1;
2215                                node->pending_strong_ref = 1;
2216                                node->local_strong_refs++;
2217                        } else if (!strong && node->has_strong_ref) {
2218                                cmd = BR_RELEASE;
2219                                cmd_name = "BR_RELEASE";
2220                                node->has_strong_ref = 0;
2221                        } else if (!weak && node->has_weak_ref) {
2222                                cmd = BR_DECREFS;
2223                                cmd_name = "BR_DECREFS";
2224                                node->has_weak_ref = 0;
2225                        }
2226                        if (cmd != BR_NOOP) {
2227                                if (put_user(cmd, (uint32_t __user *)ptr))
2228                                        return -EFAULT;
2229                                ptr += sizeof(uint32_t);
2230                                if (put_user(node->ptr, (void * __user *)ptr))
2231                                        return -EFAULT;
2232                                ptr += sizeof(void *);
2233                                if (put_user(node->cookie, (void * __user *)ptr))
2234                                        return -EFAULT;
2235                                ptr += sizeof(void *);
2236
2237                                binder_stat_br(proc, thread, cmd);
2238                                binder_debug(BINDER_DEBUG_USER_REFS,
2239                                             "%d:%d %s %d u%p c%p\n",
2240                                             proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2241                        } else {
2242                                list_del_init(&w->entry);
2243                                if (!weak && !strong) {
2244                                        binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2245                                                     "%d:%d node %d u%p c%p deleted\n",
2246                                                     proc->pid, thread->pid, node->debug_id,
2247                                                     node->ptr, node->cookie);
2248                                        rb_erase(&node->rb_node, &proc->nodes);
2249                                        kfree(node);
2250                                        binder_stats_deleted(BINDER_STAT_NODE);
2251                                } else {
2252                                        binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2253                                                     "%d:%d node %d u%p c%p state unchanged\n",
2254                                                     proc->pid, thread->pid, node->debug_id, node->ptr,
2255                                                     node->cookie);
2256                                }
2257                        }
2258                } break;
2259                case BINDER_WORK_DEAD_BINDER:
2260                case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2261                case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2262                        struct binder_ref_death *death;
2263                        uint32_t cmd;
2264
2265                        death = container_of(w, struct binder_ref_death, work);
2266                        if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2267                                cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2268                        else
2269                                cmd = BR_DEAD_BINDER;
2270                        if (put_user(cmd, (uint32_t __user *)ptr))
2271                                return -EFAULT;
2272                        ptr += sizeof(uint32_t);
2273                        if (put_user(death->cookie, (void * __user *)ptr))
2274                                return -EFAULT;
2275                        ptr += sizeof(void *);
2276                        binder_stat_br(proc, thread, cmd);
2277                        binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2278                                     "%d:%d %s %p\n",
2279                                      proc->pid, thread->pid,
2280                                      cmd == BR_DEAD_BINDER ?
2281                                      "BR_DEAD_BINDER" :
2282                                      "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2283                                      death->cookie);
2284
2285                        if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2286                                list_del(&w->entry);
2287                                kfree(death);
2288                                binder_stats_deleted(BINDER_STAT_DEATH);
2289                        } else
2290                                list_move(&w->entry, &proc->delivered_death);
2291                        if (cmd == BR_DEAD_BINDER)
2292                                goto done; /* DEAD_BINDER notifications can cause transactions */
2293                } break;
2294                }
2295
2296                if (!t)
2297                        continue;
2298
2299                BUG_ON(t->buffer == NULL);
2300                if (t->buffer->target_node) {
2301                        struct binder_node *target_node = t->buffer->target_node;
2302                        tr.target.ptr = target_node->ptr;
2303                        tr.cookie =  target_node->cookie;
2304                        t->saved_priority = task_nice(current);
2305                        if (t->priority < target_node->min_priority &&
2306                            !(t->flags & TF_ONE_WAY))
2307                                binder_set_nice(t->priority);
2308                        else if (!(t->flags & TF_ONE_WAY) ||
2309                                 t->saved_priority > target_node->min_priority)
2310                                binder_set_nice(target_node->min_priority);
2311                        cmd = BR_TRANSACTION;
2312                } else {
2313                        tr.target.ptr = NULL;
2314                        tr.cookie = NULL;
2315                        cmd = BR_REPLY;
2316                }
2317                tr.code = t->code;
2318                tr.flags = t->flags;
2319                tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2320
2321                if (t->from) {
2322                        struct task_struct *sender = t->from->proc->tsk;
2323                        tr.sender_pid = task_tgid_nr_ns(sender,
2324                                                        task_active_pid_ns(current));
2325                } else {
2326                        tr.sender_pid = 0;
2327                }
2328
2329                tr.data_size = t->buffer->data_size;
2330                tr.offsets_size = t->buffer->offsets_size;
2331                tr.data.ptr.buffer = (void *)t->buffer->data +
2332                                        proc->user_buffer_offset;
2333                tr.data.ptr.offsets = tr.data.ptr.buffer +
2334                                        ALIGN(t->buffer->data_size,
2335                                            sizeof(void *));
2336
2337                if (put_user(cmd, (uint32_t __user *)ptr))
2338                        return -EFAULT;
2339                ptr += sizeof(uint32_t);
2340                if (copy_to_user(ptr, &tr, sizeof(tr)))
2341                        return -EFAULT;
2342                ptr += sizeof(tr);
2343
2344                trace_binder_transaction_received(t);
2345                binder_stat_br(proc, thread, cmd);
2346                binder_debug(BINDER_DEBUG_TRANSACTION,
2347                             "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %p-%p\n",
2348                             proc->pid, thread->pid,
2349                             (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2350                             "BR_REPLY",
2351                             t->debug_id, t->from ? t->from->proc->pid : 0,
2352                             t->from ? t->from->pid : 0, cmd,
2353                             t->buffer->data_size, t->buffer->offsets_size,
2354                             tr.data.ptr.buffer, tr.data.ptr.offsets);
2355
2356                list_del(&t->work.entry);
2357                t->buffer->allow_user_free = 1;
2358                if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2359                        t->to_parent = thread->transaction_stack;
2360                        t->to_thread = thread;
2361                        thread->transaction_stack = t;
2362                } else {
2363                        t->buffer->transaction = NULL;
2364                        kfree(t);
2365                        binder_stats_deleted(BINDER_STAT_TRANSACTION);
2366                }
2367                break;
2368        }
2369
2370done:
2371
2372        *consumed = ptr - buffer;
2373        if (proc->requested_threads + proc->ready_threads == 0 &&
2374            proc->requested_threads_started < proc->max_threads &&
2375            (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2376             BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2377             /*spawn a new thread if we leave this out */) {
2378                proc->requested_threads++;
2379                binder_debug(BINDER_DEBUG_THREADS,
2380                             "%d:%d BR_SPAWN_LOOPER\n",
2381                             proc->pid, thread->pid);
2382                if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2383                        return -EFAULT;
2384                binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2385        }
2386        return 0;
2387}
2388
2389static void binder_release_work(struct list_head *list)
2390{
2391        struct binder_work *w;
2392        while (!list_empty(list)) {
2393                w = list_first_entry(list, struct binder_work, entry);
2394                list_del_init(&w->entry);
2395                switch (w->type) {
2396                case BINDER_WORK_TRANSACTION: {
2397                        struct binder_transaction *t;
2398
2399                        t = container_of(w, struct binder_transaction, work);
2400                        if (t->buffer->target_node &&
2401                            !(t->flags & TF_ONE_WAY)) {
2402                                binder_send_failed_reply(t, BR_DEAD_REPLY);
2403                        } else {
2404                                binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2405                                        "undelivered transaction %d\n",
2406                                        t->debug_id);
2407                                t->buffer->transaction = NULL;
2408                                kfree(t);
2409                                binder_stats_deleted(BINDER_STAT_TRANSACTION);
2410                        }
2411                } break;
2412                case BINDER_WORK_TRANSACTION_COMPLETE: {
2413                        binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2414                                "undelivered TRANSACTION_COMPLETE\n");
2415                        kfree(w);
2416                        binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2417                } break;
2418                case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2419                case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2420                        struct binder_ref_death *death;
2421
2422                        death = container_of(w, struct binder_ref_death, work);
2423                        binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2424                                "undelivered death notification, %p\n",
2425                                death->cookie);
2426                        kfree(death);
2427                        binder_stats_deleted(BINDER_STAT_DEATH);
2428                } break;
2429                default:
2430                        pr_err("unexpected work type, %d, not freed\n",
2431                               w->type);
2432                        break;
2433                }
2434        }
2435
2436}
2437
2438static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2439{
2440        struct binder_thread *thread = NULL;
2441        struct rb_node *parent = NULL;
2442        struct rb_node **p = &proc->threads.rb_node;
2443
2444        while (*p) {
2445                parent = *p;
2446                thread = rb_entry(parent, struct binder_thread, rb_node);
2447
2448                if (current->pid < thread->pid)
2449                        p = &(*p)->rb_left;
2450                else if (current->pid > thread->pid)
2451                        p = &(*p)->rb_right;
2452                else
2453                        break;
2454        }
2455        if (*p == NULL) {
2456                thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2457                if (thread == NULL)
2458                        return NULL;
2459                binder_stats_created(BINDER_STAT_THREAD);
2460                thread->proc = proc;
2461                thread->pid = current->pid;
2462                init_waitqueue_head(&thread->wait);
2463                INIT_LIST_HEAD(&thread->todo);
2464                rb_link_node(&thread->rb_node, parent, p);
2465                rb_insert_color(&thread->rb_node, &proc->threads);
2466                thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2467                thread->return_error = BR_OK;
2468                thread->return_error2 = BR_OK;
2469        }
2470        return thread;
2471}
2472
2473static int binder_free_thread(struct binder_proc *proc,
2474                              struct binder_thread *thread)
2475{
2476        struct binder_transaction *t;
2477        struct binder_transaction *send_reply = NULL;
2478        int active_transactions = 0;
2479
2480        rb_erase(&thread->rb_node, &proc->threads);
2481        t = thread->transaction_stack;
2482        if (t && t->to_thread == thread)
2483                send_reply = t;
2484        while (t) {
2485                active_transactions++;
2486                binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2487                             "release %d:%d transaction %d %s, still active\n",
2488                              proc->pid, thread->pid,
2489                             t->debug_id,
2490                             (t->to_thread == thread) ? "in" : "out");
2491
2492                if (t->to_thread == thread) {
2493                        t->to_proc = NULL;
2494                        t->to_thread = NULL;
2495                        if (t->buffer) {
2496                                t->buffer->transaction = NULL;
2497                                t->buffer = NULL;
2498                        }
2499                        t = t->to_parent;
2500                } else if (t->from == thread) {
2501                        t->from = NULL;
2502                        t = t->from_parent;
2503                } else
2504                        BUG();
2505        }
2506        if (send_reply)
2507                binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2508        binder_release_work(&thread->todo);
2509        kfree(thread);
2510        binder_stats_deleted(BINDER_STAT_THREAD);
2511        return active_transactions;
2512}
2513
2514static unsigned int binder_poll(struct file *filp,
2515                                struct poll_table_struct *wait)
2516{
2517        struct binder_proc *proc = filp->private_data;
2518        struct binder_thread *thread = NULL;
2519        int wait_for_proc_work;
2520
2521        binder_lock(__func__);
2522
2523        thread = binder_get_thread(proc);
2524
2525        wait_for_proc_work = thread->transaction_stack == NULL &&
2526                list_empty(&thread->todo) && thread->return_error == BR_OK;
2527
2528        binder_unlock(__func__);
2529
2530        if (wait_for_proc_work) {
2531                if (binder_has_proc_work(proc, thread))
2532                        return POLLIN;
2533                poll_wait(filp, &proc->wait, wait);
2534                if (binder_has_proc_work(proc, thread))
2535                        return POLLIN;
2536        } else {
2537                if (binder_has_thread_work(thread))
2538                        return POLLIN;
2539                poll_wait(filp, &thread->wait, wait);
2540                if (binder_has_thread_work(thread))
2541                        return POLLIN;
2542        }
2543        return 0;
2544}
2545
2546static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2547{
2548        int ret;
2549        struct binder_proc *proc = filp->private_data;
2550        struct binder_thread *thread;
2551        unsigned int size = _IOC_SIZE(cmd);
2552        void __user *ubuf = (void __user *)arg;
2553
2554        /*pr_info("binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2555
2556        trace_binder_ioctl(cmd, arg);
2557
2558        ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2559        if (ret)
2560                goto err_unlocked;
2561
2562        binder_lock(__func__);
2563        thread = binder_get_thread(proc);
2564        if (thread == NULL) {
2565                ret = -ENOMEM;
2566                goto err;
2567        }
2568
2569        switch (cmd) {
2570        case BINDER_WRITE_READ: {
2571                struct binder_write_read bwr;
2572                if (size != sizeof(struct binder_write_read)) {
2573                        ret = -EINVAL;
2574                        goto err;
2575                }
2576                if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2577                        ret = -EFAULT;
2578                        goto err;
2579                }
2580                binder_debug(BINDER_DEBUG_READ_WRITE,
2581                             "%d:%d write %ld at %08lx, read %ld at %08lx\n",
2582                             proc->pid, thread->pid, bwr.write_size,
2583                             bwr.write_buffer, bwr.read_size, bwr.read_buffer);
2584
2585                if (bwr.write_size > 0) {
2586                        ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2587                        trace_binder_write_done(ret);
2588                        if (ret < 0) {
2589                                bwr.read_consumed = 0;
2590                                if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2591                                        ret = -EFAULT;
2592                                goto err;
2593                        }
2594                }
2595                if (bwr.read_size > 0) {
2596                        ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2597                        trace_binder_read_done(ret);
2598                        if (!list_empty(&proc->todo))
2599                                wake_up_interruptible(&proc->wait);
2600                        if (ret < 0) {
2601                                if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2602                                        ret = -EFAULT;
2603                                goto err;
2604                        }
2605                }
2606                binder_debug(BINDER_DEBUG_READ_WRITE,
2607                             "%d:%d wrote %ld of %ld, read return %ld of %ld\n",
2608                             proc->pid, thread->pid, bwr.write_consumed, bwr.write_size,
2609                             bwr.read_consumed, bwr.read_size);
2610                if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2611                        ret = -EFAULT;
2612                        goto err;
2613                }
2614                break;
2615        }
2616        case BINDER_SET_MAX_THREADS:
2617                if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2618                        ret = -EINVAL;
2619                        goto err;
2620                }
2621                break;
2622        case BINDER_SET_CONTEXT_MGR:
2623                if (binder_context_mgr_node != NULL) {
2624                        pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2625                        ret = -EBUSY;
2626                        goto err;
2627                }
2628                if (uid_valid(binder_context_mgr_uid)) {
2629                        if (!uid_eq(binder_context_mgr_uid, current->cred->euid)) {
2630                                pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2631                                       from_kuid(&init_user_ns, current->cred->euid),
2632                                       from_kuid(&init_user_ns, binder_context_mgr_uid));
2633                                ret = -EPERM;
2634                                goto err;
2635                        }
2636                } else
2637                        binder_context_mgr_uid = current->cred->euid;
2638                binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2639                if (binder_context_mgr_node == NULL) {
2640                        ret = -ENOMEM;
2641                        goto err;
2642                }
2643                binder_context_mgr_node->local_weak_refs++;
2644                binder_context_mgr_node->local_strong_refs++;
2645                binder_context_mgr_node->has_strong_ref = 1;
2646                binder_context_mgr_node->has_weak_ref = 1;
2647                break;
2648        case BINDER_THREAD_EXIT:
2649                binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2650                             proc->pid, thread->pid);
2651                binder_free_thread(proc, thread);
2652                thread = NULL;
2653                break;
2654        case BINDER_VERSION:
2655                if (size != sizeof(struct binder_version)) {
2656                        ret = -EINVAL;
2657                        goto err;
2658                }
2659                if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2660                        ret = -EINVAL;
2661                        goto err;
2662                }
2663                break;
2664        default:
2665                ret = -EINVAL;
2666                goto err;
2667        }
2668        ret = 0;
2669err:
2670        if (thread)
2671                thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2672        binder_unlock(__func__);
2673        wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2674        if (ret && ret != -ERESTARTSYS)
2675                pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2676err_unlocked:
2677        trace_binder_ioctl_done(ret);
2678        return ret;
2679}
2680
2681static void binder_vma_open(struct vm_area_struct *vma)
2682{
2683        struct binder_proc *proc = vma->vm_private_data;
2684        binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2685                     "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2686                     proc->pid, vma->vm_start, vma->vm_end,
2687                     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2688                     (unsigned long)pgprot_val(vma->vm_page_prot));
2689}
2690
2691static void binder_vma_close(struct vm_area_struct *vma)
2692{
2693        struct binder_proc *proc = vma->vm_private_data;
2694        binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2695                     "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2696                     proc->pid, vma->vm_start, vma->vm_end,
2697                     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2698                     (unsigned long)pgprot_val(vma->vm_page_prot));
2699        proc->vma = NULL;
2700        proc->vma_vm_mm = NULL;
2701        binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2702}
2703
2704static struct vm_operations_struct binder_vm_ops = {
2705        .open = binder_vma_open,
2706        .close = binder_vma_close,
2707};
2708
2709static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2710{
2711        int ret;
2712        struct vm_struct *area;
2713        struct binder_proc *proc = filp->private_data;
2714        const char *failure_string;
2715        struct binder_buffer *buffer;
2716
2717        if (proc->tsk != current)
2718                return -EINVAL;
2719
2720        if ((vma->vm_end - vma->vm_start) > SZ_4M)
2721                vma->vm_end = vma->vm_start + SZ_4M;
2722
2723        binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2724                     "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2725                     proc->pid, vma->vm_start, vma->vm_end,
2726                     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2727                     (unsigned long)pgprot_val(vma->vm_page_prot));
2728
2729        if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2730                ret = -EPERM;
2731                failure_string = "bad vm_flags";
2732                goto err_bad_arg;
2733        }
2734        vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2735
2736        mutex_lock(&binder_mmap_lock);
2737        if (proc->buffer) {
2738                ret = -EBUSY;
2739                failure_string = "already mapped";
2740                goto err_already_mapped;
2741        }
2742
2743        area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2744        if (area == NULL) {
2745                ret = -ENOMEM;
2746                failure_string = "get_vm_area";
2747                goto err_get_vm_area_failed;
2748        }
2749        proc->buffer = area->addr;
2750        proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2751        mutex_unlock(&binder_mmap_lock);
2752
2753#ifdef CONFIG_CPU_CACHE_VIPT
2754        if (cache_is_vipt_aliasing()) {
2755                while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2756                        pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2757                        vma->vm_start += PAGE_SIZE;
2758                }
2759        }
2760#endif
2761        proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2762        if (proc->pages == NULL) {
2763                ret = -ENOMEM;
2764                failure_string = "alloc page array";
2765                goto err_alloc_pages_failed;
2766        }
2767        proc->buffer_size = vma->vm_end - vma->vm_start;
2768
2769        vma->vm_ops = &binder_vm_ops;
2770        vma->vm_private_data = proc;
2771
2772        if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2773                ret = -ENOMEM;
2774                failure_string = "alloc small buf";
2775                goto err_alloc_small_buf_failed;
2776        }
2777        buffer = proc->buffer;
2778        INIT_LIST_HEAD(&proc->buffers);
2779        list_add(&buffer->entry, &proc->buffers);
2780        buffer->free = 1;
2781        binder_insert_free_buffer(proc, buffer);
2782        proc->free_async_space = proc->buffer_size / 2;
2783        barrier();
2784        proc->files = get_files_struct(current);
2785        proc->vma = vma;
2786        proc->vma_vm_mm = vma->vm_mm;
2787
2788        /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2789                 proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2790        return 0;
2791
2792err_alloc_small_buf_failed:
2793        kfree(proc->pages);
2794        proc->pages = NULL;
2795err_alloc_pages_failed:
2796        mutex_lock(&binder_mmap_lock);
2797        vfree(proc->buffer);
2798        proc->buffer = NULL;
2799err_get_vm_area_failed:
2800err_already_mapped:
2801        mutex_unlock(&binder_mmap_lock);
2802err_bad_arg:
2803        pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2804               proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2805        return ret;
2806}
2807
2808static int binder_open(struct inode *nodp, struct file *filp)
2809{
2810        struct binder_proc *proc;
2811
2812        binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2813                     current->group_leader->pid, current->pid);
2814
2815        proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2816        if (proc == NULL)
2817                return -ENOMEM;
2818        get_task_struct(current);
2819        proc->tsk = current;
2820        INIT_LIST_HEAD(&proc->todo);
2821        init_waitqueue_head(&proc->wait);
2822        proc->default_priority = task_nice(current);
2823
2824        binder_lock(__func__);
2825
2826        binder_stats_created(BINDER_STAT_PROC);
2827        hlist_add_head(&proc->proc_node, &binder_procs);
2828        proc->pid = current->group_leader->pid;
2829        INIT_LIST_HEAD(&proc->delivered_death);
2830        filp->private_data = proc;
2831
2832        binder_unlock(__func__);
2833
2834        if (binder_debugfs_dir_entry_proc) {
2835                char strbuf[11];
2836                snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2837                proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2838                        binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2839        }
2840
2841        return 0;
2842}
2843
2844static int binder_flush(struct file *filp, fl_owner_t id)
2845{
2846        struct binder_proc *proc = filp->private_data;
2847
2848        binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2849
2850        return 0;
2851}
2852
2853static void binder_deferred_flush(struct binder_proc *proc)
2854{
2855        struct rb_node *n;
2856        int wake_count = 0;
2857        for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2858                struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2859                thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2860                if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2861                        wake_up_interruptible(&thread->wait);
2862                        wake_count++;
2863                }
2864        }
2865        wake_up_interruptible_all(&proc->wait);
2866
2867        binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2868                     "binder_flush: %d woke %d threads\n", proc->pid,
2869                     wake_count);
2870}
2871
2872static int binder_release(struct inode *nodp, struct file *filp)
2873{
2874        struct binder_proc *proc = filp->private_data;
2875        debugfs_remove(proc->debugfs_entry);
2876        binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2877
2878        return 0;
2879}
2880
2881static int binder_node_release(struct binder_node *node, int refs)
2882{
2883        struct binder_ref *ref;
2884        int death = 0;
2885
2886        list_del_init(&node->work.entry);
2887        binder_release_work(&node->async_todo);
2888
2889        if (hlist_empty(&node->refs)) {
2890                kfree(node);
2891                binder_stats_deleted(BINDER_STAT_NODE);
2892
2893                return refs;
2894        }
2895
2896        node->proc = NULL;
2897        node->local_strong_refs = 0;
2898        node->local_weak_refs = 0;
2899        hlist_add_head(&node->dead_node, &binder_dead_nodes);
2900
2901        hlist_for_each_entry(ref, &node->refs, node_entry) {
2902                refs++;
2903
2904                if (!ref->death)
2905                        goto out;
2906
2907                death++;
2908
2909                if (list_empty(&ref->death->work.entry)) {
2910                        ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2911                        list_add_tail(&ref->death->work.entry,
2912                                      &ref->proc->todo);
2913                        wake_up_interruptible(&ref->proc->wait);
2914                } else
2915                        BUG();
2916        }
2917
2918out:
2919        binder_debug(BINDER_DEBUG_DEAD_BINDER,
2920                     "node %d now dead, refs %d, death %d\n",
2921                     node->debug_id, refs, death);
2922
2923        return refs;
2924}
2925
2926static void binder_deferred_release(struct binder_proc *proc)
2927{
2928        struct binder_transaction *t;
2929        struct rb_node *n;
2930        int threads, nodes, incoming_refs, outgoing_refs, buffers,
2931                active_transactions, page_count;
2932
2933        BUG_ON(proc->vma);
2934        BUG_ON(proc->files);
2935
2936        hlist_del(&proc->proc_node);
2937
2938        if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2939                binder_debug(BINDER_DEBUG_DEAD_BINDER,
2940                             "%s: %d context_mgr_node gone\n",
2941                             __func__, proc->pid);
2942                binder_context_mgr_node = NULL;
2943        }
2944
2945        threads = 0;
2946        active_transactions = 0;
2947        while ((n = rb_first(&proc->threads))) {
2948                struct binder_thread *thread;
2949
2950                thread = rb_entry(n, struct binder_thread, rb_node);
2951                threads++;
2952                active_transactions += binder_free_thread(proc, thread);
2953        }
2954
2955        nodes = 0;
2956        incoming_refs = 0;
2957        while ((n = rb_first(&proc->nodes))) {
2958                struct binder_node *node;
2959
2960                node = rb_entry(n, struct binder_node, rb_node);
2961                nodes++;
2962                rb_erase(&node->rb_node, &proc->nodes);
2963                incoming_refs = binder_node_release(node, incoming_refs);
2964        }
2965
2966        outgoing_refs = 0;
2967        while ((n = rb_first(&proc->refs_by_desc))) {
2968                struct binder_ref *ref;
2969
2970                ref = rb_entry(n, struct binder_ref, rb_node_desc);
2971                outgoing_refs++;
2972                binder_delete_ref(ref);
2973        }
2974
2975        binder_release_work(&proc->todo);
2976        binder_release_work(&proc->delivered_death);
2977
2978        buffers = 0;
2979        while ((n = rb_first(&proc->allocated_buffers))) {
2980                struct binder_buffer *buffer;
2981
2982                buffer = rb_entry(n, struct binder_buffer, rb_node);
2983
2984                t = buffer->transaction;
2985                if (t) {
2986                        t->buffer = NULL;
2987                        buffer->transaction = NULL;
2988                        pr_err("release proc %d, transaction %d, not freed\n",
2989                               proc->pid, t->debug_id);
2990                        /*BUG();*/
2991                }
2992
2993                binder_free_buf(proc, buffer);
2994                buffers++;
2995        }
2996
2997        binder_stats_deleted(BINDER_STAT_PROC);
2998
2999        page_count = 0;
3000        if (proc->pages) {
3001                int i;
3002
3003                for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3004                        void *page_addr;
3005
3006                        if (!proc->pages[i])
3007                                continue;
3008
3009                        page_addr = proc->buffer + i * PAGE_SIZE;
3010                        binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3011                                     "%s: %d: page %d at %p not freed\n",
3012                                     __func__, proc->pid, i, page_addr);
3013                        unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3014                        __free_page(proc->pages[i]);
3015                        page_count++;
3016                }
3017                kfree(proc->pages);
3018                vfree(proc->buffer);
3019        }
3020
3021        put_task_struct(proc->tsk);
3022
3023        binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3024                     "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3025                     __func__, proc->pid, threads, nodes, incoming_refs,
3026                     outgoing_refs, active_transactions, buffers, page_count);
3027
3028        kfree(proc);
3029}
3030
3031static void binder_deferred_func(struct work_struct *work)
3032{
3033        struct binder_proc *proc;
3034        struct files_struct *files;
3035
3036        int defer;
3037        do {
3038                binder_lock(__func__);
3039                mutex_lock(&binder_deferred_lock);
3040                if (!hlist_empty(&binder_deferred_list)) {
3041                        proc = hlist_entry(binder_deferred_list.first,
3042                                        struct binder_proc, deferred_work_node);
3043                        hlist_del_init(&proc->deferred_work_node);
3044                        defer = proc->deferred_work;
3045                        proc->deferred_work = 0;
3046                } else {
3047                        proc = NULL;
3048                        defer = 0;
3049                }
3050                mutex_unlock(&binder_deferred_lock);
3051
3052                files = NULL;
3053                if (defer & BINDER_DEFERRED_PUT_FILES) {
3054                        files = proc->files;
3055                        if (files)
3056                                proc->files = NULL;
3057                }
3058
3059                if (defer & BINDER_DEFERRED_FLUSH)
3060                        binder_deferred_flush(proc);
3061
3062                if (defer & BINDER_DEFERRED_RELEASE)
3063                        binder_deferred_release(proc); /* frees proc */
3064
3065                binder_unlock(__func__);
3066                if (files)
3067                        put_files_struct(files);
3068        } while (proc);
3069}
3070static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3071
3072static void
3073binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3074{
3075        mutex_lock(&binder_deferred_lock);
3076        proc->deferred_work |= defer;
3077        if (hlist_unhashed(&proc->deferred_work_node)) {
3078                hlist_add_head(&proc->deferred_work_node,
3079                                &binder_deferred_list);
3080                queue_work(binder_deferred_workqueue, &binder_deferred_work);
3081        }
3082        mutex_unlock(&binder_deferred_lock);
3083}
3084
3085static void print_binder_transaction(struct seq_file *m, const char *prefix,
3086                                     struct binder_transaction *t)
3087{
3088        seq_printf(m,
3089                   "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3090                   prefix, t->debug_id, t,
3091                   t->from ? t->from->proc->pid : 0,
3092                   t->from ? t->from->pid : 0,
3093                   t->to_proc ? t->to_proc->pid : 0,
3094                   t->to_thread ? t->to_thread->pid : 0,
3095                   t->code, t->flags, t->priority, t->need_reply);
3096        if (t->buffer == NULL) {
3097                seq_puts(m, " buffer free\n");
3098                return;
3099        }
3100        if (t->buffer->target_node)
3101                seq_printf(m, " node %d",
3102                           t->buffer->target_node->debug_id);
3103        seq_printf(m, " size %zd:%zd data %p\n",
3104                   t->buffer->data_size, t->buffer->offsets_size,
3105                   t->buffer->data);
3106}
3107
3108static void print_binder_buffer(struct seq_file *m, const char *prefix,
3109                                struct binder_buffer *buffer)
3110{
3111        seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3112                   prefix, buffer->debug_id, buffer->data,
3113                   buffer->data_size, buffer->offsets_size,
3114                   buffer->transaction ? "active" : "delivered");
3115}
3116
3117static void print_binder_work(struct seq_file *m, const char *prefix,
3118                              const char *transaction_prefix,
3119                              struct binder_work *w)
3120{
3121        struct binder_node *node;
3122        struct binder_transaction *t;
3123
3124        switch (w->type) {
3125        case BINDER_WORK_TRANSACTION:
3126                t = container_of(w, struct binder_transaction, work);
3127                print_binder_transaction(m, transaction_prefix, t);
3128                break;
3129        case BINDER_WORK_TRANSACTION_COMPLETE:
3130                seq_printf(m, "%stransaction complete\n", prefix);
3131                break;
3132        case BINDER_WORK_NODE:
3133                node = container_of(w, struct binder_node, work);
3134                seq_printf(m, "%snode work %d: u%p c%p\n",
3135                           prefix, node->debug_id, node->ptr, node->cookie);
3136                break;
3137        case BINDER_WORK_DEAD_BINDER:
3138                seq_printf(m, "%shas dead binder\n", prefix);
3139                break;
3140        case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3141                seq_printf(m, "%shas cleared dead binder\n", prefix);
3142                break;
3143        case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3144                seq_printf(m, "%shas cleared death notification\n", prefix);
3145                break;
3146        default:
3147                seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3148                break;
3149        }
3150}
3151
3152static void print_binder_thread(struct seq_file *m,
3153                                struct binder_thread *thread,
3154                                int print_always)
3155{
3156        struct binder_transaction *t;
3157        struct binder_work *w;
3158        size_t start_pos = m->count;
3159        size_t header_pos;
3160
3161        seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3162        header_pos = m->count;
3163        t = thread->transaction_stack;
3164        while (t) {
3165                if (t->from == thread) {
3166                        print_binder_transaction(m,
3167                                                 "    outgoing transaction", t);
3168                        t = t->from_parent;
3169                } else if (t->to_thread == thread) {
3170                        print_binder_transaction(m,
3171                                                 "    incoming transaction", t);
3172                        t = t->to_parent;
3173                } else {
3174                        print_binder_transaction(m, "    bad transaction", t);
3175                        t = NULL;
3176                }
3177        }
3178        list_for_each_entry(w, &thread->todo, entry) {
3179                print_binder_work(m, "    ", "    pending transaction", w);
3180        }
3181        if (!print_always && m->count == header_pos)
3182                m->count = start_pos;
3183}
3184
3185static void print_binder_node(struct seq_file *m, struct binder_node *node)
3186{
3187        struct binder_ref *ref;
3188        struct binder_work *w;
3189        int count;
3190
3191        count = 0;
3192        hlist_for_each_entry(ref, &node->refs, node_entry)
3193                count++;
3194
3195        seq_printf(m, "  node %d: u%p c%p hs %d hw %d ls %d lw %d is %d iw %d",
3196                   node->debug_id, node->ptr, node->cookie,
3197                   node->has_strong_ref, node->has_weak_ref,
3198                   node->local_strong_refs, node->local_weak_refs,
3199                   node->internal_strong_refs, count);
3200        if (count) {
3201                seq_puts(m, " proc");
3202                hlist_for_each_entry(ref, &node->refs, node_entry)
3203                        seq_printf(m, " %d", ref->proc->pid);
3204        }
3205        seq_puts(m, "\n");
3206        list_for_each_entry(w, &node->async_todo, entry)
3207                print_binder_work(m, "    ",
3208                                  "    pending async transaction", w);
3209}
3210
3211static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3212{
3213        seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3214                   ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3215                   ref->node->debug_id, ref->strong, ref->weak, ref->death);
3216}
3217
3218static void print_binder_proc(struct seq_file *m,
3219                              struct binder_proc *proc, int print_all)
3220{
3221        struct binder_work *w;
3222        struct rb_node *n;
3223        size_t start_pos = m->count;
3224        size_t header_pos;
3225
3226        seq_printf(m, "proc %d\n", proc->pid);
3227        header_pos = m->count;
3228
3229        for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3230                print_binder_thread(m, rb_entry(n, struct binder_thread,
3231                                                rb_node), print_all);
3232        for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3233                struct binder_node *node = rb_entry(n, struct binder_node,
3234                                                    rb_node);
3235                if (print_all || node->has_async_transaction)
3236                        print_binder_node(m, node);
3237        }
3238        if (print_all) {
3239                for (n = rb_first(&proc->refs_by_desc);
3240                     n != NULL;
3241                     n = rb_next(n))
3242                        print_binder_ref(m, rb_entry(n, struct binder_ref,
3243                                                     rb_node_desc));
3244        }
3245        for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3246                print_binder_buffer(m, "  buffer",
3247                                    rb_entry(n, struct binder_buffer, rb_node));
3248        list_for_each_entry(w, &proc->todo, entry)
3249                print_binder_work(m, "  ", "  pending transaction", w);
3250        list_for_each_entry(w, &proc->delivered_death, entry) {
3251                seq_puts(m, "  has delivered dead binder\n");
3252                break;
3253        }
3254        if (!print_all && m->count == header_pos)
3255                m->count = start_pos;
3256}
3257
3258static const char * const binder_return_strings[] = {
3259        "BR_ERROR",
3260        "BR_OK",
3261        "BR_TRANSACTION",
3262        "BR_REPLY",
3263        "BR_ACQUIRE_RESULT",
3264        "BR_DEAD_REPLY",
3265        "BR_TRANSACTION_COMPLETE",
3266        "BR_INCREFS",
3267        "BR_ACQUIRE",
3268        "BR_RELEASE",
3269        "BR_DECREFS",
3270        "BR_ATTEMPT_ACQUIRE",
3271        "BR_NOOP",
3272        "BR_SPAWN_LOOPER",
3273        "BR_FINISHED",
3274        "BR_DEAD_BINDER",
3275        "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3276        "BR_FAILED_REPLY"
3277};
3278
3279static const char * const binder_command_strings[] = {
3280        "BC_TRANSACTION",
3281        "BC_REPLY",
3282        "BC_ACQUIRE_RESULT",
3283        "BC_FREE_BUFFER",
3284        "BC_INCREFS",
3285        "BC_ACQUIRE",
3286        "BC_RELEASE",
3287        "BC_DECREFS",
3288        "BC_INCREFS_DONE",
3289        "BC_ACQUIRE_DONE",
3290        "BC_ATTEMPT_ACQUIRE",
3291        "BC_REGISTER_LOOPER",
3292        "BC_ENTER_LOOPER",
3293        "BC_EXIT_LOOPER",
3294        "BC_REQUEST_DEATH_NOTIFICATION",
3295        "BC_CLEAR_DEATH_NOTIFICATION",
3296        "BC_DEAD_BINDER_DONE"
3297};
3298
3299static const char * const binder_objstat_strings[] = {
3300        "proc",
3301        "thread",
3302        "node",
3303        "ref",
3304        "death",
3305        "transaction",
3306        "transaction_complete"
3307};
3308
3309static void print_binder_stats(struct seq_file *m, const char *prefix,
3310                               struct binder_stats *stats)
3311{
3312        int i;
3313
3314        BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3315                     ARRAY_SIZE(binder_command_strings));
3316        for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3317                if (stats->bc[i])
3318                        seq_printf(m, "%s%s: %d\n", prefix,
3319                                   binder_command_strings[i], stats->bc[i]);
3320        }
3321
3322        BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3323                     ARRAY_SIZE(binder_return_strings));
3324        for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3325                if (stats->br[i])
3326                        seq_printf(m, "%s%s: %d\n", prefix,
3327                                   binder_return_strings[i], stats->br[i]);
3328        }
3329
3330        BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3331                     ARRAY_SIZE(binder_objstat_strings));
3332        BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3333                     ARRAY_SIZE(stats->obj_deleted));
3334        for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3335                if (stats->obj_created[i] || stats->obj_deleted[i])
3336                        seq_printf(m, "%s%s: active %d total %d\n", prefix,
3337                                binder_objstat_strings[i],
3338                                stats->obj_created[i] - stats->obj_deleted[i],
3339                                stats->obj_created[i]);
3340        }
3341}
3342
3343static void print_binder_proc_stats(struct seq_file *m,
3344                                    struct binder_proc *proc)
3345{
3346        struct binder_work *w;
3347        struct rb_node *n;
3348        int count, strong, weak;
3349
3350        seq_printf(m, "proc %d\n", proc->pid);
3351        count = 0;
3352        for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3353                count++;
3354        seq_printf(m, "  threads: %d\n", count);
3355        seq_printf(m, "  requested threads: %d+%d/%d\n"
3356                        "  ready threads %d\n"
3357                        "  free async space %zd\n", proc->requested_threads,
3358                        proc->requested_threads_started, proc->max_threads,
3359                        proc->ready_threads, proc->free_async_space);
3360        count = 0;
3361        for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3362                count++;
3363        seq_printf(m, "  nodes: %d\n", count);
3364        count = 0;
3365        strong = 0;
3366        weak = 0;
3367        for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3368                struct binder_ref *ref = rb_entry(n, struct binder_ref,
3369                                                  rb_node_desc);
3370                count++;
3371                strong += ref->strong;
3372                weak += ref->weak;
3373        }
3374        seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3375
3376        count = 0;
3377        for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3378                count++;
3379        seq_printf(m, "  buffers: %d\n", count);
3380
3381        count = 0;
3382        list_for_each_entry(w, &proc->todo, entry) {
3383                switch (w->type) {
3384                case BINDER_WORK_TRANSACTION:
3385                        count++;
3386                        break;
3387                default:
3388                        break;
3389                }
3390        }
3391        seq_printf(m, "  pending transactions: %d\n", count);
3392
3393        print_binder_stats(m, "  ", &proc->stats);
3394}
3395
3396
3397static int binder_state_show(struct seq_file *m, void *unused)
3398{
3399        struct binder_proc *proc;
3400        struct binder_node *node;
3401        int do_lock = !binder_debug_no_lock;
3402
3403        if (do_lock)
3404                binder_lock(__func__);
3405
3406        seq_puts(m, "binder state:\n");
3407
3408        if (!hlist_empty(&binder_dead_nodes))
3409                seq_puts(m, "dead nodes:\n");
3410        hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3411                print_binder_node(m, node);
3412
3413        hlist_for_each_entry(proc, &binder_procs, proc_node)
3414                print_binder_proc(m, proc, 1);
3415        if (do_lock)
3416                binder_unlock(__func__);
3417        return 0;
3418}
3419
3420static int binder_stats_show(struct seq_file *m, void *unused)
3421{
3422        struct binder_proc *proc;
3423        int do_lock = !binder_debug_no_lock;
3424
3425        if (do_lock)
3426                binder_lock(__func__);
3427
3428        seq_puts(m, "binder stats:\n");
3429
3430        print_binder_stats(m, "", &binder_stats);
3431
3432        hlist_for_each_entry(proc, &binder_procs, proc_node)
3433                print_binder_proc_stats(m, proc);
3434        if (do_lock)
3435                binder_unlock(__func__);
3436        return 0;
3437}
3438
3439static int binder_transactions_show(struct seq_file *m, void *unused)
3440{
3441        struct binder_proc *proc;
3442        int do_lock = !binder_debug_no_lock;
3443
3444        if (do_lock)
3445                binder_lock(__func__);
3446
3447        seq_puts(m, "binder transactions:\n");
3448        hlist_for_each_entry(proc, &binder_procs, proc_node)
3449                print_binder_proc(m, proc, 0);
3450        if (do_lock)
3451                binder_unlock(__func__);
3452        return 0;
3453}
3454
3455static int binder_proc_show(struct seq_file *m, void *unused)
3456{
3457        struct binder_proc *proc = m->private;
3458        int do_lock = !binder_debug_no_lock;
3459
3460        if (do_lock)
3461                binder_lock(__func__);
3462        seq_puts(m, "binder proc state:\n");
3463        print_binder_proc(m, proc, 1);
3464        if (do_lock)
3465                binder_unlock(__func__);
3466        return 0;
3467}
3468
3469static void print_binder_transaction_log_entry(struct seq_file *m,
3470                                        struct binder_transaction_log_entry *e)
3471{
3472        seq_printf(m,
3473                   "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3474                   e->debug_id, (e->call_type == 2) ? "reply" :
3475                   ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3476                   e->from_thread, e->to_proc, e->to_thread, e->to_node,
3477                   e->target_handle, e->data_size, e->offsets_size);
3478}
3479
3480static int binder_transaction_log_show(struct seq_file *m, void *unused)
3481{
3482        struct binder_transaction_log *log = m->private;
3483        int i;
3484
3485        if (log->full) {
3486                for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3487                        print_binder_transaction_log_entry(m, &log->entry[i]);
3488        }
3489        for (i = 0; i < log->next; i++)
3490                print_binder_transaction_log_entry(m, &log->entry[i]);
3491        return 0;
3492}
3493
3494static const struct file_operations binder_fops = {
3495        .owner = THIS_MODULE,
3496        .poll = binder_poll,
3497        .unlocked_ioctl = binder_ioctl,
3498        .mmap = binder_mmap,
3499        .open = binder_open,
3500        .flush = binder_flush,
3501        .release = binder_release,
3502};
3503
3504static struct miscdevice binder_miscdev = {
3505        .minor = MISC_DYNAMIC_MINOR,
3506        .name = "binder",
3507        .fops = &binder_fops
3508};
3509
3510BINDER_DEBUG_ENTRY(state);
3511BINDER_DEBUG_ENTRY(stats);
3512BINDER_DEBUG_ENTRY(transactions);
3513BINDER_DEBUG_ENTRY(transaction_log);
3514
3515static int __init binder_init(void)
3516{
3517        int ret;
3518
3519        binder_deferred_workqueue = create_singlethread_workqueue("binder");
3520        if (!binder_deferred_workqueue)
3521                return -ENOMEM;
3522
3523        binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3524        if (binder_debugfs_dir_entry_root)
3525                binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3526                                                 binder_debugfs_dir_entry_root);
3527        ret = misc_register(&binder_miscdev);
3528        if (binder_debugfs_dir_entry_root) {
3529                debugfs_create_file("state",
3530                                    S_IRUGO,
3531                                    binder_debugfs_dir_entry_root,
3532                                    NULL,
3533                                    &binder_state_fops);
3534                debugfs_create_file("stats",
3535                                    S_IRUGO,
3536                                    binder_debugfs_dir_entry_root,
3537                                    NULL,
3538                                    &binder_stats_fops);
3539                debugfs_create_file("transactions",
3540                                    S_IRUGO,
3541                                    binder_debugfs_dir_entry_root,
3542                                    NULL,
3543                                    &binder_transactions_fops);
3544                debugfs_create_file("transaction_log",
3545                                    S_IRUGO,
3546                                    binder_debugfs_dir_entry_root,
3547                                    &binder_transaction_log,
3548                                    &binder_transaction_log_fops);
3549                debugfs_create_file("failed_transaction_log",
3550                                    S_IRUGO,
3551                                    binder_debugfs_dir_entry_root,
3552                                    &binder_transaction_log_failed,
3553                                    &binder_transaction_log_fops);
3554        }
3555        return ret;
3556}
3557
3558device_initcall(binder_init);
3559
3560#define CREATE_TRACE_POINTS
3561#include "binder_trace.h"
3562
3563MODULE_LICENSE("GPL v2");
3564