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50#include <asm/uaccess.h>
51
52#include <linux/errno.h>
53#include <linux/time.h>
54#include <linux/proc_fs.h>
55#include <linux/stat.h>
56#include <linux/task_io_accounting_ops.h>
57#include <linux/init.h>
58#include <linux/capability.h>
59#include <linux/file.h>
60#include <linux/fdtable.h>
61#include <linux/string.h>
62#include <linux/seq_file.h>
63#include <linux/namei.h>
64#include <linux/mnt_namespace.h>
65#include <linux/mm.h>
66#include <linux/swap.h>
67#include <linux/rcupdate.h>
68#include <linux/kallsyms.h>
69#include <linux/stacktrace.h>
70#include <linux/resource.h>
71#include <linux/module.h>
72#include <linux/mount.h>
73#include <linux/security.h>
74#include <linux/ptrace.h>
75#include <linux/tracehook.h>
76#include <linux/cgroup.h>
77#include <linux/cpuset.h>
78#include <linux/audit.h>
79#include <linux/poll.h>
80#include <linux/nsproxy.h>
81#include <linux/oom.h>
82#include <linux/elf.h>
83#include <linux/pid_namespace.h>
84#include <linux/fs_struct.h>
85#include <linux/slab.h>
86#include "internal.h"
87
88
89
90
91
92
93
94
95
96
97
98struct pid_entry {
99 char *name;
100 int len;
101 mode_t mode;
102 const struct inode_operations *iop;
103 const struct file_operations *fop;
104 union proc_op op;
105};
106
107#define NOD(NAME, MODE, IOP, FOP, OP) { \
108 .name = (NAME), \
109 .len = sizeof(NAME) - 1, \
110 .mode = MODE, \
111 .iop = IOP, \
112 .fop = FOP, \
113 .op = OP, \
114}
115
116#define DIR(NAME, MODE, iops, fops) \
117 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
118#define LNK(NAME, get_link) \
119 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
120 &proc_pid_link_inode_operations, NULL, \
121 { .proc_get_link = get_link } )
122#define REG(NAME, MODE, fops) \
123 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
124#define INF(NAME, MODE, read) \
125 NOD(NAME, (S_IFREG|(MODE)), \
126 NULL, &proc_info_file_operations, \
127 { .proc_read = read } )
128#define ONE(NAME, MODE, show) \
129 NOD(NAME, (S_IFREG|(MODE)), \
130 NULL, &proc_single_file_operations, \
131 { .proc_show = show } )
132
133
134
135
136
137static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
138 unsigned int n)
139{
140 unsigned int i;
141 unsigned int count;
142
143 count = 0;
144 for (i = 0; i < n; ++i) {
145 if (S_ISDIR(entries[i].mode))
146 ++count;
147 }
148
149 return count;
150}
151
152static int get_task_root(struct task_struct *task, struct path *root)
153{
154 int result = -ENOENT;
155
156 task_lock(task);
157 if (task->fs) {
158 get_fs_root(task->fs, root);
159 result = 0;
160 }
161 task_unlock(task);
162 return result;
163}
164
165static int proc_cwd_link(struct inode *inode, struct path *path)
166{
167 struct task_struct *task = get_proc_task(inode);
168 int result = -ENOENT;
169
170 if (task) {
171 task_lock(task);
172 if (task->fs) {
173 get_fs_pwd(task->fs, path);
174 result = 0;
175 }
176 task_unlock(task);
177 put_task_struct(task);
178 }
179 return result;
180}
181
182static int proc_root_link(struct inode *inode, struct path *path)
183{
184 struct task_struct *task = get_proc_task(inode);
185 int result = -ENOENT;
186
187 if (task) {
188 result = get_task_root(task, path);
189 put_task_struct(task);
190 }
191 return result;
192}
193
194
195
196
197static int check_mem_permission(struct task_struct *task)
198{
199
200
201
202
203 if (task == current)
204 return 0;
205
206
207
208
209
210 if (task_is_stopped_or_traced(task)) {
211 int match;
212 rcu_read_lock();
213 match = (tracehook_tracer_task(task) == current);
214 rcu_read_unlock();
215 if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
216 return 0;
217 }
218
219
220
221
222 return -EPERM;
223}
224
225struct mm_struct *mm_for_maps(struct task_struct *task)
226{
227 struct mm_struct *mm;
228
229 if (mutex_lock_killable(&task->signal->cred_guard_mutex))
230 return NULL;
231
232 mm = get_task_mm(task);
233 if (mm && mm != current->mm &&
234 !ptrace_may_access(task, PTRACE_MODE_READ)) {
235 mmput(mm);
236 mm = NULL;
237 }
238 mutex_unlock(&task->signal->cred_guard_mutex);
239
240 return mm;
241}
242
243static int proc_pid_cmdline(struct task_struct *task, char * buffer)
244{
245 int res = 0;
246 unsigned int len;
247 struct mm_struct *mm = get_task_mm(task);
248 if (!mm)
249 goto out;
250 if (!mm->arg_end)
251 goto out_mm;
252
253 len = mm->arg_end - mm->arg_start;
254
255 if (len > PAGE_SIZE)
256 len = PAGE_SIZE;
257
258 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
259
260
261
262 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
263 len = strnlen(buffer, res);
264 if (len < res) {
265 res = len;
266 } else {
267 len = mm->env_end - mm->env_start;
268 if (len > PAGE_SIZE - res)
269 len = PAGE_SIZE - res;
270 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
271 res = strnlen(buffer, res);
272 }
273 }
274out_mm:
275 mmput(mm);
276out:
277 return res;
278}
279
280static int proc_pid_auxv(struct task_struct *task, char *buffer)
281{
282 int res = 0;
283 struct mm_struct *mm = get_task_mm(task);
284 if (mm) {
285 unsigned int nwords = 0;
286 do {
287 nwords += 2;
288 } while (mm->saved_auxv[nwords - 2] != 0);
289 res = nwords * sizeof(mm->saved_auxv[0]);
290 if (res > PAGE_SIZE)
291 res = PAGE_SIZE;
292 memcpy(buffer, mm->saved_auxv, res);
293 mmput(mm);
294 }
295 return res;
296}
297
298
299#ifdef CONFIG_KALLSYMS
300
301
302
303
304static int proc_pid_wchan(struct task_struct *task, char *buffer)
305{
306 unsigned long wchan;
307 char symname[KSYM_NAME_LEN];
308
309 wchan = get_wchan(task);
310
311 if (lookup_symbol_name(wchan, symname) < 0)
312 if (!ptrace_may_access(task, PTRACE_MODE_READ))
313 return 0;
314 else
315 return sprintf(buffer, "%lu", wchan);
316 else
317 return sprintf(buffer, "%s", symname);
318}
319#endif
320
321#ifdef CONFIG_STACKTRACE
322
323#define MAX_STACK_TRACE_DEPTH 64
324
325static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
326 struct pid *pid, struct task_struct *task)
327{
328 struct stack_trace trace;
329 unsigned long *entries;
330 int i;
331
332 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
333 if (!entries)
334 return -ENOMEM;
335
336 trace.nr_entries = 0;
337 trace.max_entries = MAX_STACK_TRACE_DEPTH;
338 trace.entries = entries;
339 trace.skip = 0;
340 save_stack_trace_tsk(task, &trace);
341
342 for (i = 0; i < trace.nr_entries; i++) {
343 seq_printf(m, "[<%p>] %pS\n",
344 (void *)entries[i], (void *)entries[i]);
345 }
346 kfree(entries);
347
348 return 0;
349}
350#endif
351
352#ifdef CONFIG_SCHEDSTATS
353
354
355
356static int proc_pid_schedstat(struct task_struct *task, char *buffer)
357{
358 return sprintf(buffer, "%llu %llu %lu\n",
359 (unsigned long long)task->se.sum_exec_runtime,
360 (unsigned long long)task->sched_info.run_delay,
361 task->sched_info.pcount);
362}
363#endif
364
365#ifdef CONFIG_LATENCYTOP
366static int lstats_show_proc(struct seq_file *m, void *v)
367{
368 int i;
369 struct inode *inode = m->private;
370 struct task_struct *task = get_proc_task(inode);
371
372 if (!task)
373 return -ESRCH;
374 seq_puts(m, "Latency Top version : v0.1\n");
375 for (i = 0; i < 32; i++) {
376 struct latency_record *lr = &task->latency_record[i];
377 if (lr->backtrace[0]) {
378 int q;
379 seq_printf(m, "%i %li %li",
380 lr->count, lr->time, lr->max);
381 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
382 unsigned long bt = lr->backtrace[q];
383 if (!bt)
384 break;
385 if (bt == ULONG_MAX)
386 break;
387 seq_printf(m, " %ps", (void *)bt);
388 }
389 seq_putc(m, '\n');
390 }
391
392 }
393 put_task_struct(task);
394 return 0;
395}
396
397static int lstats_open(struct inode *inode, struct file *file)
398{
399 return single_open(file, lstats_show_proc, inode);
400}
401
402static ssize_t lstats_write(struct file *file, const char __user *buf,
403 size_t count, loff_t *offs)
404{
405 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
406
407 if (!task)
408 return -ESRCH;
409 clear_all_latency_tracing(task);
410 put_task_struct(task);
411
412 return count;
413}
414
415static const struct file_operations proc_lstats_operations = {
416 .open = lstats_open,
417 .read = seq_read,
418 .write = lstats_write,
419 .llseek = seq_lseek,
420 .release = single_release,
421};
422
423#endif
424
425static int proc_oom_score(struct task_struct *task, char *buffer)
426{
427 unsigned long points = 0;
428
429 read_lock(&tasklist_lock);
430 if (pid_alive(task))
431 points = oom_badness(task, NULL, NULL,
432 totalram_pages + total_swap_pages);
433 read_unlock(&tasklist_lock);
434 return sprintf(buffer, "%lu\n", points);
435}
436
437struct limit_names {
438 char *name;
439 char *unit;
440};
441
442static const struct limit_names lnames[RLIM_NLIMITS] = {
443 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
444 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
445 [RLIMIT_DATA] = {"Max data size", "bytes"},
446 [RLIMIT_STACK] = {"Max stack size", "bytes"},
447 [RLIMIT_CORE] = {"Max core file size", "bytes"},
448 [RLIMIT_RSS] = {"Max resident set", "bytes"},
449 [RLIMIT_NPROC] = {"Max processes", "processes"},
450 [RLIMIT_NOFILE] = {"Max open files", "files"},
451 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
452 [RLIMIT_AS] = {"Max address space", "bytes"},
453 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
454 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
455 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
456 [RLIMIT_NICE] = {"Max nice priority", NULL},
457 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
458 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
459};
460
461
462static int proc_pid_limits(struct task_struct *task, char *buffer)
463{
464 unsigned int i;
465 int count = 0;
466 unsigned long flags;
467 char *bufptr = buffer;
468
469 struct rlimit rlim[RLIM_NLIMITS];
470
471 if (!lock_task_sighand(task, &flags))
472 return 0;
473 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
474 unlock_task_sighand(task, &flags);
475
476
477
478
479 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
480 "Limit", "Soft Limit", "Hard Limit", "Units");
481
482 for (i = 0; i < RLIM_NLIMITS; i++) {
483 if (rlim[i].rlim_cur == RLIM_INFINITY)
484 count += sprintf(&bufptr[count], "%-25s %-20s ",
485 lnames[i].name, "unlimited");
486 else
487 count += sprintf(&bufptr[count], "%-25s %-20lu ",
488 lnames[i].name, rlim[i].rlim_cur);
489
490 if (rlim[i].rlim_max == RLIM_INFINITY)
491 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
492 else
493 count += sprintf(&bufptr[count], "%-20lu ",
494 rlim[i].rlim_max);
495
496 if (lnames[i].unit)
497 count += sprintf(&bufptr[count], "%-10s\n",
498 lnames[i].unit);
499 else
500 count += sprintf(&bufptr[count], "\n");
501 }
502
503 return count;
504}
505
506#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
507static int proc_pid_syscall(struct task_struct *task, char *buffer)
508{
509 long nr;
510 unsigned long args[6], sp, pc;
511
512 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
513 return sprintf(buffer, "running\n");
514
515 if (nr < 0)
516 return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
517
518 return sprintf(buffer,
519 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
520 nr,
521 args[0], args[1], args[2], args[3], args[4], args[5],
522 sp, pc);
523}
524#endif
525
526
527
528
529
530
531static int proc_fd_access_allowed(struct inode *inode)
532{
533 struct task_struct *task;
534 int allowed = 0;
535
536
537
538
539 task = get_proc_task(inode);
540 if (task) {
541 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
542 put_task_struct(task);
543 }
544 return allowed;
545}
546
547static int proc_setattr(struct dentry *dentry, struct iattr *attr)
548{
549 int error;
550 struct inode *inode = dentry->d_inode;
551
552 if (attr->ia_valid & ATTR_MODE)
553 return -EPERM;
554
555 error = inode_change_ok(inode, attr);
556 if (error)
557 return error;
558
559 if ((attr->ia_valid & ATTR_SIZE) &&
560 attr->ia_size != i_size_read(inode)) {
561 error = vmtruncate(inode, attr->ia_size);
562 if (error)
563 return error;
564 }
565
566 setattr_copy(inode, attr);
567 mark_inode_dirty(inode);
568 return 0;
569}
570
571static const struct inode_operations proc_def_inode_operations = {
572 .setattr = proc_setattr,
573};
574
575static int mounts_open_common(struct inode *inode, struct file *file,
576 const struct seq_operations *op)
577{
578 struct task_struct *task = get_proc_task(inode);
579 struct nsproxy *nsp;
580 struct mnt_namespace *ns = NULL;
581 struct path root;
582 struct proc_mounts *p;
583 int ret = -EINVAL;
584
585 if (task) {
586 rcu_read_lock();
587 nsp = task_nsproxy(task);
588 if (nsp) {
589 ns = nsp->mnt_ns;
590 if (ns)
591 get_mnt_ns(ns);
592 }
593 rcu_read_unlock();
594 if (ns && get_task_root(task, &root) == 0)
595 ret = 0;
596 put_task_struct(task);
597 }
598
599 if (!ns)
600 goto err;
601 if (ret)
602 goto err_put_ns;
603
604 ret = -ENOMEM;
605 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
606 if (!p)
607 goto err_put_path;
608
609 file->private_data = &p->m;
610 ret = seq_open(file, op);
611 if (ret)
612 goto err_free;
613
614 p->m.private = p;
615 p->ns = ns;
616 p->root = root;
617 p->event = ns->event;
618
619 return 0;
620
621 err_free:
622 kfree(p);
623 err_put_path:
624 path_put(&root);
625 err_put_ns:
626 put_mnt_ns(ns);
627 err:
628 return ret;
629}
630
631static int mounts_release(struct inode *inode, struct file *file)
632{
633 struct proc_mounts *p = file->private_data;
634 path_put(&p->root);
635 put_mnt_ns(p->ns);
636 return seq_release(inode, file);
637}
638
639static unsigned mounts_poll(struct file *file, poll_table *wait)
640{
641 struct proc_mounts *p = file->private_data;
642 unsigned res = POLLIN | POLLRDNORM;
643
644 poll_wait(file, &p->ns->poll, wait);
645 if (mnt_had_events(p))
646 res |= POLLERR | POLLPRI;
647
648 return res;
649}
650
651static int mounts_open(struct inode *inode, struct file *file)
652{
653 return mounts_open_common(inode, file, &mounts_op);
654}
655
656static const struct file_operations proc_mounts_operations = {
657 .open = mounts_open,
658 .read = seq_read,
659 .llseek = seq_lseek,
660 .release = mounts_release,
661 .poll = mounts_poll,
662};
663
664static int mountinfo_open(struct inode *inode, struct file *file)
665{
666 return mounts_open_common(inode, file, &mountinfo_op);
667}
668
669static const struct file_operations proc_mountinfo_operations = {
670 .open = mountinfo_open,
671 .read = seq_read,
672 .llseek = seq_lseek,
673 .release = mounts_release,
674 .poll = mounts_poll,
675};
676
677static int mountstats_open(struct inode *inode, struct file *file)
678{
679 return mounts_open_common(inode, file, &mountstats_op);
680}
681
682static const struct file_operations proc_mountstats_operations = {
683 .open = mountstats_open,
684 .read = seq_read,
685 .llseek = seq_lseek,
686 .release = mounts_release,
687};
688
689#define PROC_BLOCK_SIZE (3*1024)
690
691static ssize_t proc_info_read(struct file * file, char __user * buf,
692 size_t count, loff_t *ppos)
693{
694 struct inode * inode = file->f_path.dentry->d_inode;
695 unsigned long page;
696 ssize_t length;
697 struct task_struct *task = get_proc_task(inode);
698
699 length = -ESRCH;
700 if (!task)
701 goto out_no_task;
702
703 if (count > PROC_BLOCK_SIZE)
704 count = PROC_BLOCK_SIZE;
705
706 length = -ENOMEM;
707 if (!(page = __get_free_page(GFP_TEMPORARY)))
708 goto out;
709
710 length = PROC_I(inode)->op.proc_read(task, (char*)page);
711
712 if (length >= 0)
713 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
714 free_page(page);
715out:
716 put_task_struct(task);
717out_no_task:
718 return length;
719}
720
721static const struct file_operations proc_info_file_operations = {
722 .read = proc_info_read,
723 .llseek = generic_file_llseek,
724};
725
726static int proc_single_show(struct seq_file *m, void *v)
727{
728 struct inode *inode = m->private;
729 struct pid_namespace *ns;
730 struct pid *pid;
731 struct task_struct *task;
732 int ret;
733
734 ns = inode->i_sb->s_fs_info;
735 pid = proc_pid(inode);
736 task = get_pid_task(pid, PIDTYPE_PID);
737 if (!task)
738 return -ESRCH;
739
740 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
741
742 put_task_struct(task);
743 return ret;
744}
745
746static int proc_single_open(struct inode *inode, struct file *filp)
747{
748 return single_open(filp, proc_single_show, inode);
749}
750
751static const struct file_operations proc_single_file_operations = {
752 .open = proc_single_open,
753 .read = seq_read,
754 .llseek = seq_lseek,
755 .release = single_release,
756};
757
758static int mem_open(struct inode* inode, struct file* file)
759{
760 file->private_data = (void*)((long)current->self_exec_id);
761
762 file->f_mode |= FMODE_UNSIGNED_OFFSET;
763 return 0;
764}
765
766static ssize_t mem_read(struct file * file, char __user * buf,
767 size_t count, loff_t *ppos)
768{
769 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
770 char *page;
771 unsigned long src = *ppos;
772 int ret = -ESRCH;
773 struct mm_struct *mm;
774
775 if (!task)
776 goto out_no_task;
777
778 if (check_mem_permission(task))
779 goto out;
780
781 ret = -ENOMEM;
782 page = (char *)__get_free_page(GFP_TEMPORARY);
783 if (!page)
784 goto out;
785
786 ret = 0;
787
788 mm = get_task_mm(task);
789 if (!mm)
790 goto out_free;
791
792 ret = -EIO;
793
794 if (file->private_data != (void*)((long)current->self_exec_id))
795 goto out_put;
796
797 ret = 0;
798
799 while (count > 0) {
800 int this_len, retval;
801
802 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
803 retval = access_process_vm(task, src, page, this_len, 0);
804 if (!retval || check_mem_permission(task)) {
805 if (!ret)
806 ret = -EIO;
807 break;
808 }
809
810 if (copy_to_user(buf, page, retval)) {
811 ret = -EFAULT;
812 break;
813 }
814
815 ret += retval;
816 src += retval;
817 buf += retval;
818 count -= retval;
819 }
820 *ppos = src;
821
822out_put:
823 mmput(mm);
824out_free:
825 free_page((unsigned long) page);
826out:
827 put_task_struct(task);
828out_no_task:
829 return ret;
830}
831
832#define mem_write NULL
833
834#ifndef mem_write
835
836static ssize_t mem_write(struct file * file, const char __user *buf,
837 size_t count, loff_t *ppos)
838{
839 int copied;
840 char *page;
841 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
842 unsigned long dst = *ppos;
843
844 copied = -ESRCH;
845 if (!task)
846 goto out_no_task;
847
848 if (check_mem_permission(task))
849 goto out;
850
851 copied = -ENOMEM;
852 page = (char *)__get_free_page(GFP_TEMPORARY);
853 if (!page)
854 goto out;
855
856 copied = 0;
857 while (count > 0) {
858 int this_len, retval;
859
860 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
861 if (copy_from_user(page, buf, this_len)) {
862 copied = -EFAULT;
863 break;
864 }
865 retval = access_process_vm(task, dst, page, this_len, 1);
866 if (!retval) {
867 if (!copied)
868 copied = -EIO;
869 break;
870 }
871 copied += retval;
872 buf += retval;
873 dst += retval;
874 count -= retval;
875 }
876 *ppos = dst;
877 free_page((unsigned long) page);
878out:
879 put_task_struct(task);
880out_no_task:
881 return copied;
882}
883#endif
884
885loff_t mem_lseek(struct file *file, loff_t offset, int orig)
886{
887 switch (orig) {
888 case 0:
889 file->f_pos = offset;
890 break;
891 case 1:
892 file->f_pos += offset;
893 break;
894 default:
895 return -EINVAL;
896 }
897 force_successful_syscall_return();
898 return file->f_pos;
899}
900
901static const struct file_operations proc_mem_operations = {
902 .llseek = mem_lseek,
903 .read = mem_read,
904 .write = mem_write,
905 .open = mem_open,
906};
907
908static ssize_t environ_read(struct file *file, char __user *buf,
909 size_t count, loff_t *ppos)
910{
911 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
912 char *page;
913 unsigned long src = *ppos;
914 int ret = -ESRCH;
915 struct mm_struct *mm;
916
917 if (!task)
918 goto out_no_task;
919
920 if (!ptrace_may_access(task, PTRACE_MODE_READ))
921 goto out;
922
923 ret = -ENOMEM;
924 page = (char *)__get_free_page(GFP_TEMPORARY);
925 if (!page)
926 goto out;
927
928 ret = 0;
929
930 mm = get_task_mm(task);
931 if (!mm)
932 goto out_free;
933
934 while (count > 0) {
935 int this_len, retval, max_len;
936
937 this_len = mm->env_end - (mm->env_start + src);
938
939 if (this_len <= 0)
940 break;
941
942 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
943 this_len = (this_len > max_len) ? max_len : this_len;
944
945 retval = access_process_vm(task, (mm->env_start + src),
946 page, this_len, 0);
947
948 if (retval <= 0) {
949 ret = retval;
950 break;
951 }
952
953 if (copy_to_user(buf, page, retval)) {
954 ret = -EFAULT;
955 break;
956 }
957
958 ret += retval;
959 src += retval;
960 buf += retval;
961 count -= retval;
962 }
963 *ppos = src;
964
965 mmput(mm);
966out_free:
967 free_page((unsigned long) page);
968out:
969 put_task_struct(task);
970out_no_task:
971 return ret;
972}
973
974static const struct file_operations proc_environ_operations = {
975 .read = environ_read,
976 .llseek = generic_file_llseek,
977};
978
979static ssize_t oom_adjust_read(struct file *file, char __user *buf,
980 size_t count, loff_t *ppos)
981{
982 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
983 char buffer[PROC_NUMBUF];
984 size_t len;
985 int oom_adjust = OOM_DISABLE;
986 unsigned long flags;
987
988 if (!task)
989 return -ESRCH;
990
991 if (lock_task_sighand(task, &flags)) {
992 oom_adjust = task->signal->oom_adj;
993 unlock_task_sighand(task, &flags);
994 }
995
996 put_task_struct(task);
997
998 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
999
1000 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1001}
1002
1003static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
1004 size_t count, loff_t *ppos)
1005{
1006 struct task_struct *task;
1007 char buffer[PROC_NUMBUF];
1008 long oom_adjust;
1009 unsigned long flags;
1010 int err;
1011
1012 memset(buffer, 0, sizeof(buffer));
1013 if (count > sizeof(buffer) - 1)
1014 count = sizeof(buffer) - 1;
1015 if (copy_from_user(buffer, buf, count)) {
1016 err = -EFAULT;
1017 goto out;
1018 }
1019
1020 err = strict_strtol(strstrip(buffer), 0, &oom_adjust);
1021 if (err)
1022 goto out;
1023 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
1024 oom_adjust != OOM_DISABLE) {
1025 err = -EINVAL;
1026 goto out;
1027 }
1028
1029 task = get_proc_task(file->f_path.dentry->d_inode);
1030 if (!task) {
1031 err = -ESRCH;
1032 goto out;
1033 }
1034
1035 task_lock(task);
1036 if (!task->mm) {
1037 err = -EINVAL;
1038 goto err_task_lock;
1039 }
1040
1041 if (!lock_task_sighand(task, &flags)) {
1042 err = -ESRCH;
1043 goto err_task_lock;
1044 }
1045
1046 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
1047 err = -EACCES;
1048 goto err_sighand;
1049 }
1050
1051 if (oom_adjust != task->signal->oom_adj) {
1052 if (oom_adjust == OOM_DISABLE)
1053 atomic_inc(&task->mm->oom_disable_count);
1054 if (task->signal->oom_adj == OOM_DISABLE)
1055 atomic_dec(&task->mm->oom_disable_count);
1056 }
1057
1058
1059
1060
1061
1062 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, "
1063 "please use /proc/%d/oom_score_adj instead.\n",
1064 current->comm, task_pid_nr(current),
1065 task_pid_nr(task), task_pid_nr(task));
1066 task->signal->oom_adj = oom_adjust;
1067
1068
1069
1070
1071 if (task->signal->oom_adj == OOM_ADJUST_MAX)
1072 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
1073 else
1074 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
1075 -OOM_DISABLE;
1076err_sighand:
1077 unlock_task_sighand(task, &flags);
1078err_task_lock:
1079 task_unlock(task);
1080 put_task_struct(task);
1081out:
1082 return err < 0 ? err : count;
1083}
1084
1085static const struct file_operations proc_oom_adjust_operations = {
1086 .read = oom_adjust_read,
1087 .write = oom_adjust_write,
1088 .llseek = generic_file_llseek,
1089};
1090
1091static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1092 size_t count, loff_t *ppos)
1093{
1094 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1095 char buffer[PROC_NUMBUF];
1096 int oom_score_adj = OOM_SCORE_ADJ_MIN;
1097 unsigned long flags;
1098 size_t len;
1099
1100 if (!task)
1101 return -ESRCH;
1102 if (lock_task_sighand(task, &flags)) {
1103 oom_score_adj = task->signal->oom_score_adj;
1104 unlock_task_sighand(task, &flags);
1105 }
1106 put_task_struct(task);
1107 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
1108 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1109}
1110
1111static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1112 size_t count, loff_t *ppos)
1113{
1114 struct task_struct *task;
1115 char buffer[PROC_NUMBUF];
1116 unsigned long flags;
1117 long oom_score_adj;
1118 int err;
1119
1120 memset(buffer, 0, sizeof(buffer));
1121 if (count > sizeof(buffer) - 1)
1122 count = sizeof(buffer) - 1;
1123 if (copy_from_user(buffer, buf, count)) {
1124 err = -EFAULT;
1125 goto out;
1126 }
1127
1128 err = strict_strtol(strstrip(buffer), 0, &oom_score_adj);
1129 if (err)
1130 goto out;
1131 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
1132 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1133 err = -EINVAL;
1134 goto out;
1135 }
1136
1137 task = get_proc_task(file->f_path.dentry->d_inode);
1138 if (!task) {
1139 err = -ESRCH;
1140 goto out;
1141 }
1142
1143 task_lock(task);
1144 if (!task->mm) {
1145 err = -EINVAL;
1146 goto err_task_lock;
1147 }
1148
1149 if (!lock_task_sighand(task, &flags)) {
1150 err = -ESRCH;
1151 goto err_task_lock;
1152 }
1153
1154 if (oom_score_adj < task->signal->oom_score_adj_min &&
1155 !capable(CAP_SYS_RESOURCE)) {
1156 err = -EACCES;
1157 goto err_sighand;
1158 }
1159
1160 if (oom_score_adj != task->signal->oom_score_adj) {
1161 if (oom_score_adj == OOM_SCORE_ADJ_MIN)
1162 atomic_inc(&task->mm->oom_disable_count);
1163 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1164 atomic_dec(&task->mm->oom_disable_count);
1165 }
1166 task->signal->oom_score_adj = oom_score_adj;
1167 if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
1168 task->signal->oom_score_adj_min = oom_score_adj;
1169
1170
1171
1172
1173 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1174 task->signal->oom_adj = OOM_DISABLE;
1175 else
1176 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1177 OOM_SCORE_ADJ_MAX;
1178err_sighand:
1179 unlock_task_sighand(task, &flags);
1180err_task_lock:
1181 task_unlock(task);
1182 put_task_struct(task);
1183out:
1184 return err < 0 ? err : count;
1185}
1186
1187static const struct file_operations proc_oom_score_adj_operations = {
1188 .read = oom_score_adj_read,
1189 .write = oom_score_adj_write,
1190 .llseek = default_llseek,
1191};
1192
1193#ifdef CONFIG_AUDITSYSCALL
1194#define TMPBUFLEN 21
1195static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1196 size_t count, loff_t *ppos)
1197{
1198 struct inode * inode = file->f_path.dentry->d_inode;
1199 struct task_struct *task = get_proc_task(inode);
1200 ssize_t length;
1201 char tmpbuf[TMPBUFLEN];
1202
1203 if (!task)
1204 return -ESRCH;
1205 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1206 audit_get_loginuid(task));
1207 put_task_struct(task);
1208 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1209}
1210
1211static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1212 size_t count, loff_t *ppos)
1213{
1214 struct inode * inode = file->f_path.dentry->d_inode;
1215 char *page, *tmp;
1216 ssize_t length;
1217 uid_t loginuid;
1218
1219 if (!capable(CAP_AUDIT_CONTROL))
1220 return -EPERM;
1221
1222 rcu_read_lock();
1223 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1224 rcu_read_unlock();
1225 return -EPERM;
1226 }
1227 rcu_read_unlock();
1228
1229 if (count >= PAGE_SIZE)
1230 count = PAGE_SIZE - 1;
1231
1232 if (*ppos != 0) {
1233
1234 return -EINVAL;
1235 }
1236 page = (char*)__get_free_page(GFP_TEMPORARY);
1237 if (!page)
1238 return -ENOMEM;
1239 length = -EFAULT;
1240 if (copy_from_user(page, buf, count))
1241 goto out_free_page;
1242
1243 page[count] = '\0';
1244 loginuid = simple_strtoul(page, &tmp, 10);
1245 if (tmp == page) {
1246 length = -EINVAL;
1247 goto out_free_page;
1248
1249 }
1250 length = audit_set_loginuid(current, loginuid);
1251 if (likely(length == 0))
1252 length = count;
1253
1254out_free_page:
1255 free_page((unsigned long) page);
1256 return length;
1257}
1258
1259static const struct file_operations proc_loginuid_operations = {
1260 .read = proc_loginuid_read,
1261 .write = proc_loginuid_write,
1262 .llseek = generic_file_llseek,
1263};
1264
1265static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1266 size_t count, loff_t *ppos)
1267{
1268 struct inode * inode = file->f_path.dentry->d_inode;
1269 struct task_struct *task = get_proc_task(inode);
1270 ssize_t length;
1271 char tmpbuf[TMPBUFLEN];
1272
1273 if (!task)
1274 return -ESRCH;
1275 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1276 audit_get_sessionid(task));
1277 put_task_struct(task);
1278 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1279}
1280
1281static const struct file_operations proc_sessionid_operations = {
1282 .read = proc_sessionid_read,
1283 .llseek = generic_file_llseek,
1284};
1285#endif
1286
1287#ifdef CONFIG_FAULT_INJECTION
1288static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1289 size_t count, loff_t *ppos)
1290{
1291 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1292 char buffer[PROC_NUMBUF];
1293 size_t len;
1294 int make_it_fail;
1295
1296 if (!task)
1297 return -ESRCH;
1298 make_it_fail = task->make_it_fail;
1299 put_task_struct(task);
1300
1301 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
1302
1303 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1304}
1305
1306static ssize_t proc_fault_inject_write(struct file * file,
1307 const char __user * buf, size_t count, loff_t *ppos)
1308{
1309 struct task_struct *task;
1310 char buffer[PROC_NUMBUF], *end;
1311 int make_it_fail;
1312
1313 if (!capable(CAP_SYS_RESOURCE))
1314 return -EPERM;
1315 memset(buffer, 0, sizeof(buffer));
1316 if (count > sizeof(buffer) - 1)
1317 count = sizeof(buffer) - 1;
1318 if (copy_from_user(buffer, buf, count))
1319 return -EFAULT;
1320 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1321 if (*end)
1322 return -EINVAL;
1323 task = get_proc_task(file->f_dentry->d_inode);
1324 if (!task)
1325 return -ESRCH;
1326 task->make_it_fail = make_it_fail;
1327 put_task_struct(task);
1328
1329 return count;
1330}
1331
1332static const struct file_operations proc_fault_inject_operations = {
1333 .read = proc_fault_inject_read,
1334 .write = proc_fault_inject_write,
1335 .llseek = generic_file_llseek,
1336};
1337#endif
1338
1339
1340#ifdef CONFIG_SCHED_DEBUG
1341
1342
1343
1344static int sched_show(struct seq_file *m, void *v)
1345{
1346 struct inode *inode = m->private;
1347 struct task_struct *p;
1348
1349 p = get_proc_task(inode);
1350 if (!p)
1351 return -ESRCH;
1352 proc_sched_show_task(p, m);
1353
1354 put_task_struct(p);
1355
1356 return 0;
1357}
1358
1359static ssize_t
1360sched_write(struct file *file, const char __user *buf,
1361 size_t count, loff_t *offset)
1362{
1363 struct inode *inode = file->f_path.dentry->d_inode;
1364 struct task_struct *p;
1365
1366 p = get_proc_task(inode);
1367 if (!p)
1368 return -ESRCH;
1369 proc_sched_set_task(p);
1370
1371 put_task_struct(p);
1372
1373 return count;
1374}
1375
1376static int sched_open(struct inode *inode, struct file *filp)
1377{
1378 return single_open(filp, sched_show, inode);
1379}
1380
1381static const struct file_operations proc_pid_sched_operations = {
1382 .open = sched_open,
1383 .read = seq_read,
1384 .write = sched_write,
1385 .llseek = seq_lseek,
1386 .release = single_release,
1387};
1388
1389#endif
1390
1391#ifdef CONFIG_SCHED_AUTOGROUP
1392
1393
1394
1395static int sched_autogroup_show(struct seq_file *m, void *v)
1396{
1397 struct inode *inode = m->private;
1398 struct task_struct *p;
1399
1400 p = get_proc_task(inode);
1401 if (!p)
1402 return -ESRCH;
1403 proc_sched_autogroup_show_task(p, m);
1404
1405 put_task_struct(p);
1406
1407 return 0;
1408}
1409
1410static ssize_t
1411sched_autogroup_write(struct file *file, const char __user *buf,
1412 size_t count, loff_t *offset)
1413{
1414 struct inode *inode = file->f_path.dentry->d_inode;
1415 struct task_struct *p;
1416 char buffer[PROC_NUMBUF];
1417 long nice;
1418 int err;
1419
1420 memset(buffer, 0, sizeof(buffer));
1421 if (count > sizeof(buffer) - 1)
1422 count = sizeof(buffer) - 1;
1423 if (copy_from_user(buffer, buf, count))
1424 return -EFAULT;
1425
1426 err = strict_strtol(strstrip(buffer), 0, &nice);
1427 if (err)
1428 return -EINVAL;
1429
1430 p = get_proc_task(inode);
1431 if (!p)
1432 return -ESRCH;
1433
1434 err = nice;
1435 err = proc_sched_autogroup_set_nice(p, &err);
1436 if (err)
1437 count = err;
1438
1439 put_task_struct(p);
1440
1441 return count;
1442}
1443
1444static int sched_autogroup_open(struct inode *inode, struct file *filp)
1445{
1446 int ret;
1447
1448 ret = single_open(filp, sched_autogroup_show, NULL);
1449 if (!ret) {
1450 struct seq_file *m = filp->private_data;
1451
1452 m->private = inode;
1453 }
1454 return ret;
1455}
1456
1457static const struct file_operations proc_pid_sched_autogroup_operations = {
1458 .open = sched_autogroup_open,
1459 .read = seq_read,
1460 .write = sched_autogroup_write,
1461 .llseek = seq_lseek,
1462 .release = single_release,
1463};
1464
1465#endif
1466
1467static ssize_t comm_write(struct file *file, const char __user *buf,
1468 size_t count, loff_t *offset)
1469{
1470 struct inode *inode = file->f_path.dentry->d_inode;
1471 struct task_struct *p;
1472 char buffer[TASK_COMM_LEN];
1473
1474 memset(buffer, 0, sizeof(buffer));
1475 if (count > sizeof(buffer) - 1)
1476 count = sizeof(buffer) - 1;
1477 if (copy_from_user(buffer, buf, count))
1478 return -EFAULT;
1479
1480 p = get_proc_task(inode);
1481 if (!p)
1482 return -ESRCH;
1483
1484 if (same_thread_group(current, p))
1485 set_task_comm(p, buffer);
1486 else
1487 count = -EINVAL;
1488
1489 put_task_struct(p);
1490
1491 return count;
1492}
1493
1494static int comm_show(struct seq_file *m, void *v)
1495{
1496 struct inode *inode = m->private;
1497 struct task_struct *p;
1498
1499 p = get_proc_task(inode);
1500 if (!p)
1501 return -ESRCH;
1502
1503 task_lock(p);
1504 seq_printf(m, "%s\n", p->comm);
1505 task_unlock(p);
1506
1507 put_task_struct(p);
1508
1509 return 0;
1510}
1511
1512static int comm_open(struct inode *inode, struct file *filp)
1513{
1514 return single_open(filp, comm_show, inode);
1515}
1516
1517static const struct file_operations proc_pid_set_comm_operations = {
1518 .open = comm_open,
1519 .read = seq_read,
1520 .write = comm_write,
1521 .llseek = seq_lseek,
1522 .release = single_release,
1523};
1524
1525
1526
1527
1528
1529
1530void added_exe_file_vma(struct mm_struct *mm)
1531{
1532 mm->num_exe_file_vmas++;
1533}
1534
1535void removed_exe_file_vma(struct mm_struct *mm)
1536{
1537 mm->num_exe_file_vmas--;
1538 if ((mm->num_exe_file_vmas == 0) && mm->exe_file){
1539 fput(mm->exe_file);
1540 mm->exe_file = NULL;
1541 }
1542
1543}
1544
1545void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
1546{
1547 if (new_exe_file)
1548 get_file(new_exe_file);
1549 if (mm->exe_file)
1550 fput(mm->exe_file);
1551 mm->exe_file = new_exe_file;
1552 mm->num_exe_file_vmas = 0;
1553}
1554
1555struct file *get_mm_exe_file(struct mm_struct *mm)
1556{
1557 struct file *exe_file;
1558
1559
1560
1561 down_read(&mm->mmap_sem);
1562 exe_file = mm->exe_file;
1563 if (exe_file)
1564 get_file(exe_file);
1565 up_read(&mm->mmap_sem);
1566 return exe_file;
1567}
1568
1569void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm)
1570{
1571
1572
1573 newmm->exe_file = get_mm_exe_file(oldmm);
1574}
1575
1576static int proc_exe_link(struct inode *inode, struct path *exe_path)
1577{
1578 struct task_struct *task;
1579 struct mm_struct *mm;
1580 struct file *exe_file;
1581
1582 task = get_proc_task(inode);
1583 if (!task)
1584 return -ENOENT;
1585 mm = get_task_mm(task);
1586 put_task_struct(task);
1587 if (!mm)
1588 return -ENOENT;
1589 exe_file = get_mm_exe_file(mm);
1590 mmput(mm);
1591 if (exe_file) {
1592 *exe_path = exe_file->f_path;
1593 path_get(&exe_file->f_path);
1594 fput(exe_file);
1595 return 0;
1596 } else
1597 return -ENOENT;
1598}
1599
1600static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1601{
1602 struct inode *inode = dentry->d_inode;
1603 int error = -EACCES;
1604
1605
1606 path_put(&nd->path);
1607
1608
1609 if (!proc_fd_access_allowed(inode))
1610 goto out;
1611
1612 error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
1613out:
1614 return ERR_PTR(error);
1615}
1616
1617static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1618{
1619 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
1620 char *pathname;
1621 int len;
1622
1623 if (!tmp)
1624 return -ENOMEM;
1625
1626 pathname = d_path(path, tmp, PAGE_SIZE);
1627 len = PTR_ERR(pathname);
1628 if (IS_ERR(pathname))
1629 goto out;
1630 len = tmp + PAGE_SIZE - 1 - pathname;
1631
1632 if (len > buflen)
1633 len = buflen;
1634 if (copy_to_user(buffer, pathname, len))
1635 len = -EFAULT;
1636 out:
1637 free_page((unsigned long)tmp);
1638 return len;
1639}
1640
1641static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1642{
1643 int error = -EACCES;
1644 struct inode *inode = dentry->d_inode;
1645 struct path path;
1646
1647
1648 if (!proc_fd_access_allowed(inode))
1649 goto out;
1650
1651 error = PROC_I(inode)->op.proc_get_link(inode, &path);
1652 if (error)
1653 goto out;
1654
1655 error = do_proc_readlink(&path, buffer, buflen);
1656 path_put(&path);
1657out:
1658 return error;
1659}
1660
1661static const struct inode_operations proc_pid_link_inode_operations = {
1662 .readlink = proc_pid_readlink,
1663 .follow_link = proc_pid_follow_link,
1664 .setattr = proc_setattr,
1665};
1666
1667
1668
1669
1670static int task_dumpable(struct task_struct *task)
1671{
1672 int dumpable = 0;
1673 struct mm_struct *mm;
1674
1675 task_lock(task);
1676 mm = task->mm;
1677 if (mm)
1678 dumpable = get_dumpable(mm);
1679 task_unlock(task);
1680 if(dumpable == 1)
1681 return 1;
1682 return 0;
1683}
1684
1685
1686static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
1687{
1688 struct inode * inode;
1689 struct proc_inode *ei;
1690 const struct cred *cred;
1691
1692
1693
1694 inode = new_inode(sb);
1695 if (!inode)
1696 goto out;
1697
1698
1699 ei = PROC_I(inode);
1700 inode->i_ino = get_next_ino();
1701 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1702 inode->i_op = &proc_def_inode_operations;
1703
1704
1705
1706
1707 ei->pid = get_task_pid(task, PIDTYPE_PID);
1708 if (!ei->pid)
1709 goto out_unlock;
1710
1711 if (task_dumpable(task)) {
1712 rcu_read_lock();
1713 cred = __task_cred(task);
1714 inode->i_uid = cred->euid;
1715 inode->i_gid = cred->egid;
1716 rcu_read_unlock();
1717 }
1718 security_task_to_inode(task, inode);
1719
1720out:
1721 return inode;
1722
1723out_unlock:
1724 iput(inode);
1725 return NULL;
1726}
1727
1728static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1729{
1730 struct inode *inode = dentry->d_inode;
1731 struct task_struct *task;
1732 const struct cred *cred;
1733
1734 generic_fillattr(inode, stat);
1735
1736 rcu_read_lock();
1737 stat->uid = 0;
1738 stat->gid = 0;
1739 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1740 if (task) {
1741 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1742 task_dumpable(task)) {
1743 cred = __task_cred(task);
1744 stat->uid = cred->euid;
1745 stat->gid = cred->egid;
1746 }
1747 }
1748 rcu_read_unlock();
1749 return 0;
1750}
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1770{
1771 struct inode *inode;
1772 struct task_struct *task;
1773 const struct cred *cred;
1774
1775 if (nd && nd->flags & LOOKUP_RCU)
1776 return -ECHILD;
1777
1778 inode = dentry->d_inode;
1779 task = get_proc_task(inode);
1780
1781 if (task) {
1782 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1783 task_dumpable(task)) {
1784 rcu_read_lock();
1785 cred = __task_cred(task);
1786 inode->i_uid = cred->euid;
1787 inode->i_gid = cred->egid;
1788 rcu_read_unlock();
1789 } else {
1790 inode->i_uid = 0;
1791 inode->i_gid = 0;
1792 }
1793 inode->i_mode &= ~(S_ISUID | S_ISGID);
1794 security_task_to_inode(task, inode);
1795 put_task_struct(task);
1796 return 1;
1797 }
1798 d_drop(dentry);
1799 return 0;
1800}
1801
1802static int pid_delete_dentry(const struct dentry * dentry)
1803{
1804
1805
1806
1807
1808 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1809}
1810
1811static const struct dentry_operations pid_dentry_operations =
1812{
1813 .d_revalidate = pid_revalidate,
1814 .d_delete = pid_delete_dentry,
1815};
1816
1817
1818
1819typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
1820 struct task_struct *, const void *);
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1835 char *name, int len,
1836 instantiate_t instantiate, struct task_struct *task, const void *ptr)
1837{
1838 struct dentry *child, *dir = filp->f_path.dentry;
1839 struct inode *inode;
1840 struct qstr qname;
1841 ino_t ino = 0;
1842 unsigned type = DT_UNKNOWN;
1843
1844 qname.name = name;
1845 qname.len = len;
1846 qname.hash = full_name_hash(name, len);
1847
1848 child = d_lookup(dir, &qname);
1849 if (!child) {
1850 struct dentry *new;
1851 new = d_alloc(dir, &qname);
1852 if (new) {
1853 child = instantiate(dir->d_inode, new, task, ptr);
1854 if (child)
1855 dput(new);
1856 else
1857 child = new;
1858 }
1859 }
1860 if (!child || IS_ERR(child) || !child->d_inode)
1861 goto end_instantiate;
1862 inode = child->d_inode;
1863 if (inode) {
1864 ino = inode->i_ino;
1865 type = inode->i_mode >> 12;
1866 }
1867 dput(child);
1868end_instantiate:
1869 if (!ino)
1870 ino = find_inode_number(dir, &qname);
1871 if (!ino)
1872 ino = 1;
1873 return filldir(dirent, name, len, filp->f_pos, ino, type);
1874}
1875
1876static unsigned name_to_int(struct dentry *dentry)
1877{
1878 const char *name = dentry->d_name.name;
1879 int len = dentry->d_name.len;
1880 unsigned n = 0;
1881
1882 if (len > 1 && *name == '0')
1883 goto out;
1884 while (len-- > 0) {
1885 unsigned c = *name++ - '0';
1886 if (c > 9)
1887 goto out;
1888 if (n >= (~0U-9)/10)
1889 goto out;
1890 n *= 10;
1891 n += c;
1892 }
1893 return n;
1894out:
1895 return ~0U;
1896}
1897
1898#define PROC_FDINFO_MAX 64
1899
1900static int proc_fd_info(struct inode *inode, struct path *path, char *info)
1901{
1902 struct task_struct *task = get_proc_task(inode);
1903 struct files_struct *files = NULL;
1904 struct file *file;
1905 int fd = proc_fd(inode);
1906
1907 if (task) {
1908 files = get_files_struct(task);
1909 put_task_struct(task);
1910 }
1911 if (files) {
1912
1913
1914
1915
1916 spin_lock(&files->file_lock);
1917 file = fcheck_files(files, fd);
1918 if (file) {
1919 if (path) {
1920 *path = file->f_path;
1921 path_get(&file->f_path);
1922 }
1923 if (info)
1924 snprintf(info, PROC_FDINFO_MAX,
1925 "pos:\t%lli\n"
1926 "flags:\t0%o\n",
1927 (long long) file->f_pos,
1928 file->f_flags);
1929 spin_unlock(&files->file_lock);
1930 put_files_struct(files);
1931 return 0;
1932 }
1933 spin_unlock(&files->file_lock);
1934 put_files_struct(files);
1935 }
1936 return -ENOENT;
1937}
1938
1939static int proc_fd_link(struct inode *inode, struct path *path)
1940{
1941 return proc_fd_info(inode, path, NULL);
1942}
1943
1944static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1945{
1946 struct inode *inode;
1947 struct task_struct *task;
1948 int fd;
1949 struct files_struct *files;
1950 const struct cred *cred;
1951
1952 if (nd && nd->flags & LOOKUP_RCU)
1953 return -ECHILD;
1954
1955 inode = dentry->d_inode;
1956 task = get_proc_task(inode);
1957 fd = proc_fd(inode);
1958
1959 if (task) {
1960 files = get_files_struct(task);
1961 if (files) {
1962 rcu_read_lock();
1963 if (fcheck_files(files, fd)) {
1964 rcu_read_unlock();
1965 put_files_struct(files);
1966 if (task_dumpable(task)) {
1967 rcu_read_lock();
1968 cred = __task_cred(task);
1969 inode->i_uid = cred->euid;
1970 inode->i_gid = cred->egid;
1971 rcu_read_unlock();
1972 } else {
1973 inode->i_uid = 0;
1974 inode->i_gid = 0;
1975 }
1976 inode->i_mode &= ~(S_ISUID | S_ISGID);
1977 security_task_to_inode(task, inode);
1978 put_task_struct(task);
1979 return 1;
1980 }
1981 rcu_read_unlock();
1982 put_files_struct(files);
1983 }
1984 put_task_struct(task);
1985 }
1986 d_drop(dentry);
1987 return 0;
1988}
1989
1990static const struct dentry_operations tid_fd_dentry_operations =
1991{
1992 .d_revalidate = tid_fd_revalidate,
1993 .d_delete = pid_delete_dentry,
1994};
1995
1996static struct dentry *proc_fd_instantiate(struct inode *dir,
1997 struct dentry *dentry, struct task_struct *task, const void *ptr)
1998{
1999 unsigned fd = *(const unsigned *)ptr;
2000 struct file *file;
2001 struct files_struct *files;
2002 struct inode *inode;
2003 struct proc_inode *ei;
2004 struct dentry *error = ERR_PTR(-ENOENT);
2005
2006 inode = proc_pid_make_inode(dir->i_sb, task);
2007 if (!inode)
2008 goto out;
2009 ei = PROC_I(inode);
2010 ei->fd = fd;
2011 files = get_files_struct(task);
2012 if (!files)
2013 goto out_iput;
2014 inode->i_mode = S_IFLNK;
2015
2016
2017
2018
2019
2020 spin_lock(&files->file_lock);
2021 file = fcheck_files(files, fd);
2022 if (!file)
2023 goto out_unlock;
2024 if (file->f_mode & FMODE_READ)
2025 inode->i_mode |= S_IRUSR | S_IXUSR;
2026 if (file->f_mode & FMODE_WRITE)
2027 inode->i_mode |= S_IWUSR | S_IXUSR;
2028 spin_unlock(&files->file_lock);
2029 put_files_struct(files);
2030
2031 inode->i_op = &proc_pid_link_inode_operations;
2032 inode->i_size = 64;
2033 ei->op.proc_get_link = proc_fd_link;
2034 d_set_d_op(dentry, &tid_fd_dentry_operations);
2035 d_add(dentry, inode);
2036
2037 if (tid_fd_revalidate(dentry, NULL))
2038 error = NULL;
2039
2040 out:
2041 return error;
2042out_unlock:
2043 spin_unlock(&files->file_lock);
2044 put_files_struct(files);
2045out_iput:
2046 iput(inode);
2047 goto out;
2048}
2049
2050static struct dentry *proc_lookupfd_common(struct inode *dir,
2051 struct dentry *dentry,
2052 instantiate_t instantiate)
2053{
2054 struct task_struct *task = get_proc_task(dir);
2055 unsigned fd = name_to_int(dentry);
2056 struct dentry *result = ERR_PTR(-ENOENT);
2057
2058 if (!task)
2059 goto out_no_task;
2060 if (fd == ~0U)
2061 goto out;
2062
2063 result = instantiate(dir, dentry, task, &fd);
2064out:
2065 put_task_struct(task);
2066out_no_task:
2067 return result;
2068}
2069
2070static int proc_readfd_common(struct file * filp, void * dirent,
2071 filldir_t filldir, instantiate_t instantiate)
2072{
2073 struct dentry *dentry = filp->f_path.dentry;
2074 struct inode *inode = dentry->d_inode;
2075 struct task_struct *p = get_proc_task(inode);
2076 unsigned int fd, ino;
2077 int retval;
2078 struct files_struct * files;
2079
2080 retval = -ENOENT;
2081 if (!p)
2082 goto out_no_task;
2083 retval = 0;
2084
2085 fd = filp->f_pos;
2086 switch (fd) {
2087 case 0:
2088 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
2089 goto out;
2090 filp->f_pos++;
2091 case 1:
2092 ino = parent_ino(dentry);
2093 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
2094 goto out;
2095 filp->f_pos++;
2096 default:
2097 files = get_files_struct(p);
2098 if (!files)
2099 goto out;
2100 rcu_read_lock();
2101 for (fd = filp->f_pos-2;
2102 fd < files_fdtable(files)->max_fds;
2103 fd++, filp->f_pos++) {
2104 char name[PROC_NUMBUF];
2105 int len;
2106
2107 if (!fcheck_files(files, fd))
2108 continue;
2109 rcu_read_unlock();
2110
2111 len = snprintf(name, sizeof(name), "%d", fd);
2112 if (proc_fill_cache(filp, dirent, filldir,
2113 name, len, instantiate,
2114 p, &fd) < 0) {
2115 rcu_read_lock();
2116 break;
2117 }
2118 rcu_read_lock();
2119 }
2120 rcu_read_unlock();
2121 put_files_struct(files);
2122 }
2123out:
2124 put_task_struct(p);
2125out_no_task:
2126 return retval;
2127}
2128
2129static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
2130 struct nameidata *nd)
2131{
2132 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
2133}
2134
2135static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
2136{
2137 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
2138}
2139
2140static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
2141 size_t len, loff_t *ppos)
2142{
2143 char tmp[PROC_FDINFO_MAX];
2144 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
2145 if (!err)
2146 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
2147 return err;
2148}
2149
2150static const struct file_operations proc_fdinfo_file_operations = {
2151 .open = nonseekable_open,
2152 .read = proc_fdinfo_read,
2153 .llseek = no_llseek,
2154};
2155
2156static const struct file_operations proc_fd_operations = {
2157 .read = generic_read_dir,
2158 .readdir = proc_readfd,
2159 .llseek = default_llseek,
2160};
2161
2162
2163
2164
2165
2166static int proc_fd_permission(struct inode *inode, int mask, unsigned int flags)
2167{
2168 int rv;
2169
2170 if (flags & IPERM_FLAG_RCU)
2171 return -ECHILD;
2172 rv = generic_permission(inode, mask, flags, NULL);
2173 if (rv == 0)
2174 return 0;
2175 if (task_pid(current) == proc_pid(inode))
2176 rv = 0;
2177 return rv;
2178}
2179
2180
2181
2182
2183static const struct inode_operations proc_fd_inode_operations = {
2184 .lookup = proc_lookupfd,
2185 .permission = proc_fd_permission,
2186 .setattr = proc_setattr,
2187};
2188
2189static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2190 struct dentry *dentry, struct task_struct *task, const void *ptr)
2191{
2192 unsigned fd = *(unsigned *)ptr;
2193 struct inode *inode;
2194 struct proc_inode *ei;
2195 struct dentry *error = ERR_PTR(-ENOENT);
2196
2197 inode = proc_pid_make_inode(dir->i_sb, task);
2198 if (!inode)
2199 goto out;
2200 ei = PROC_I(inode);
2201 ei->fd = fd;
2202 inode->i_mode = S_IFREG | S_IRUSR;
2203 inode->i_fop = &proc_fdinfo_file_operations;
2204 d_set_d_op(dentry, &tid_fd_dentry_operations);
2205 d_add(dentry, inode);
2206
2207 if (tid_fd_revalidate(dentry, NULL))
2208 error = NULL;
2209
2210 out:
2211 return error;
2212}
2213
2214static struct dentry *proc_lookupfdinfo(struct inode *dir,
2215 struct dentry *dentry,
2216 struct nameidata *nd)
2217{
2218 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2219}
2220
2221static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2222{
2223 return proc_readfd_common(filp, dirent, filldir,
2224 proc_fdinfo_instantiate);
2225}
2226
2227static const struct file_operations proc_fdinfo_operations = {
2228 .read = generic_read_dir,
2229 .readdir = proc_readfdinfo,
2230 .llseek = default_llseek,
2231};
2232
2233
2234
2235
2236static const struct inode_operations proc_fdinfo_inode_operations = {
2237 .lookup = proc_lookupfdinfo,
2238 .setattr = proc_setattr,
2239};
2240
2241
2242static struct dentry *proc_pident_instantiate(struct inode *dir,
2243 struct dentry *dentry, struct task_struct *task, const void *ptr)
2244{
2245 const struct pid_entry *p = ptr;
2246 struct inode *inode;
2247 struct proc_inode *ei;
2248 struct dentry *error = ERR_PTR(-ENOENT);
2249
2250 inode = proc_pid_make_inode(dir->i_sb, task);
2251 if (!inode)
2252 goto out;
2253
2254 ei = PROC_I(inode);
2255 inode->i_mode = p->mode;
2256 if (S_ISDIR(inode->i_mode))
2257 inode->i_nlink = 2;
2258 if (p->iop)
2259 inode->i_op = p->iop;
2260 if (p->fop)
2261 inode->i_fop = p->fop;
2262 ei->op = p->op;
2263 d_set_d_op(dentry, &pid_dentry_operations);
2264 d_add(dentry, inode);
2265
2266 if (pid_revalidate(dentry, NULL))
2267 error = NULL;
2268out:
2269 return error;
2270}
2271
2272static struct dentry *proc_pident_lookup(struct inode *dir,
2273 struct dentry *dentry,
2274 const struct pid_entry *ents,
2275 unsigned int nents)
2276{
2277 struct dentry *error;
2278 struct task_struct *task = get_proc_task(dir);
2279 const struct pid_entry *p, *last;
2280
2281 error = ERR_PTR(-ENOENT);
2282
2283 if (!task)
2284 goto out_no_task;
2285
2286
2287
2288
2289
2290 last = &ents[nents - 1];
2291 for (p = ents; p <= last; p++) {
2292 if (p->len != dentry->d_name.len)
2293 continue;
2294 if (!memcmp(dentry->d_name.name, p->name, p->len))
2295 break;
2296 }
2297 if (p > last)
2298 goto out;
2299
2300 error = proc_pident_instantiate(dir, dentry, task, p);
2301out:
2302 put_task_struct(task);
2303out_no_task:
2304 return error;
2305}
2306
2307static int proc_pident_fill_cache(struct file *filp, void *dirent,
2308 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
2309{
2310 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2311 proc_pident_instantiate, task, p);
2312}
2313
2314static int proc_pident_readdir(struct file *filp,
2315 void *dirent, filldir_t filldir,
2316 const struct pid_entry *ents, unsigned int nents)
2317{
2318 int i;
2319 struct dentry *dentry = filp->f_path.dentry;
2320 struct inode *inode = dentry->d_inode;
2321 struct task_struct *task = get_proc_task(inode);
2322 const struct pid_entry *p, *last;
2323 ino_t ino;
2324 int ret;
2325
2326 ret = -ENOENT;
2327 if (!task)
2328 goto out_no_task;
2329
2330 ret = 0;
2331 i = filp->f_pos;
2332 switch (i) {
2333 case 0:
2334 ino = inode->i_ino;
2335 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2336 goto out;
2337 i++;
2338 filp->f_pos++;
2339
2340 case 1:
2341 ino = parent_ino(dentry);
2342 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2343 goto out;
2344 i++;
2345 filp->f_pos++;
2346
2347 default:
2348 i -= 2;
2349 if (i >= nents) {
2350 ret = 1;
2351 goto out;
2352 }
2353 p = ents + i;
2354 last = &ents[nents - 1];
2355 while (p <= last) {
2356 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
2357 goto out;
2358 filp->f_pos++;
2359 p++;
2360 }
2361 }
2362
2363 ret = 1;
2364out:
2365 put_task_struct(task);
2366out_no_task:
2367 return ret;
2368}
2369
2370#ifdef CONFIG_SECURITY
2371static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2372 size_t count, loff_t *ppos)
2373{
2374 struct inode * inode = file->f_path.dentry->d_inode;
2375 char *p = NULL;
2376 ssize_t length;
2377 struct task_struct *task = get_proc_task(inode);
2378
2379 if (!task)
2380 return -ESRCH;
2381
2382 length = security_getprocattr(task,
2383 (char*)file->f_path.dentry->d_name.name,
2384 &p);
2385 put_task_struct(task);
2386 if (length > 0)
2387 length = simple_read_from_buffer(buf, count, ppos, p, length);
2388 kfree(p);
2389 return length;
2390}
2391
2392static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2393 size_t count, loff_t *ppos)
2394{
2395 struct inode * inode = file->f_path.dentry->d_inode;
2396 char *page;
2397 ssize_t length;
2398 struct task_struct *task = get_proc_task(inode);
2399
2400 length = -ESRCH;
2401 if (!task)
2402 goto out_no_task;
2403 if (count > PAGE_SIZE)
2404 count = PAGE_SIZE;
2405
2406
2407 length = -EINVAL;
2408 if (*ppos != 0)
2409 goto out;
2410
2411 length = -ENOMEM;
2412 page = (char*)__get_free_page(GFP_TEMPORARY);
2413 if (!page)
2414 goto out;
2415
2416 length = -EFAULT;
2417 if (copy_from_user(page, buf, count))
2418 goto out_free;
2419
2420
2421 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
2422 if (length < 0)
2423 goto out_free;
2424
2425 length = security_setprocattr(task,
2426 (char*)file->f_path.dentry->d_name.name,
2427 (void*)page, count);
2428 mutex_unlock(&task->signal->cred_guard_mutex);
2429out_free:
2430 free_page((unsigned long) page);
2431out:
2432 put_task_struct(task);
2433out_no_task:
2434 return length;
2435}
2436
2437static const struct file_operations proc_pid_attr_operations = {
2438 .read = proc_pid_attr_read,
2439 .write = proc_pid_attr_write,
2440 .llseek = generic_file_llseek,
2441};
2442
2443static const struct pid_entry attr_dir_stuff[] = {
2444 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2445 REG("prev", S_IRUGO, proc_pid_attr_operations),
2446 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2447 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2448 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2449 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2450};
2451
2452static int proc_attr_dir_readdir(struct file * filp,
2453 void * dirent, filldir_t filldir)
2454{
2455 return proc_pident_readdir(filp,dirent,filldir,
2456 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
2457}
2458
2459static const struct file_operations proc_attr_dir_operations = {
2460 .read = generic_read_dir,
2461 .readdir = proc_attr_dir_readdir,
2462 .llseek = default_llseek,
2463};
2464
2465static struct dentry *proc_attr_dir_lookup(struct inode *dir,
2466 struct dentry *dentry, struct nameidata *nd)
2467{
2468 return proc_pident_lookup(dir, dentry,
2469 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
2470}
2471
2472static const struct inode_operations proc_attr_dir_inode_operations = {
2473 .lookup = proc_attr_dir_lookup,
2474 .getattr = pid_getattr,
2475 .setattr = proc_setattr,
2476};
2477
2478#endif
2479
2480#ifdef CONFIG_ELF_CORE
2481static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2482 size_t count, loff_t *ppos)
2483{
2484 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2485 struct mm_struct *mm;
2486 char buffer[PROC_NUMBUF];
2487 size_t len;
2488 int ret;
2489
2490 if (!task)
2491 return -ESRCH;
2492
2493 ret = 0;
2494 mm = get_task_mm(task);
2495 if (mm) {
2496 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2497 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2498 MMF_DUMP_FILTER_SHIFT));
2499 mmput(mm);
2500 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2501 }
2502
2503 put_task_struct(task);
2504
2505 return ret;
2506}
2507
2508static ssize_t proc_coredump_filter_write(struct file *file,
2509 const char __user *buf,
2510 size_t count,
2511 loff_t *ppos)
2512{
2513 struct task_struct *task;
2514 struct mm_struct *mm;
2515 char buffer[PROC_NUMBUF], *end;
2516 unsigned int val;
2517 int ret;
2518 int i;
2519 unsigned long mask;
2520
2521 ret = -EFAULT;
2522 memset(buffer, 0, sizeof(buffer));
2523 if (count > sizeof(buffer) - 1)
2524 count = sizeof(buffer) - 1;
2525 if (copy_from_user(buffer, buf, count))
2526 goto out_no_task;
2527
2528 ret = -EINVAL;
2529 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2530 if (*end == '\n')
2531 end++;
2532 if (end - buffer == 0)
2533 goto out_no_task;
2534
2535 ret = -ESRCH;
2536 task = get_proc_task(file->f_dentry->d_inode);
2537 if (!task)
2538 goto out_no_task;
2539
2540 ret = end - buffer;
2541 mm = get_task_mm(task);
2542 if (!mm)
2543 goto out_no_mm;
2544
2545 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2546 if (val & mask)
2547 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2548 else
2549 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2550 }
2551
2552 mmput(mm);
2553 out_no_mm:
2554 put_task_struct(task);
2555 out_no_task:
2556 return ret;
2557}
2558
2559static const struct file_operations proc_coredump_filter_operations = {
2560 .read = proc_coredump_filter_read,
2561 .write = proc_coredump_filter_write,
2562 .llseek = generic_file_llseek,
2563};
2564#endif
2565
2566
2567
2568
2569static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2570 int buflen)
2571{
2572 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
2573 pid_t tgid = task_tgid_nr_ns(current, ns);
2574 char tmp[PROC_NUMBUF];
2575 if (!tgid)
2576 return -ENOENT;
2577 sprintf(tmp, "%d", tgid);
2578 return vfs_readlink(dentry,buffer,buflen,tmp);
2579}
2580
2581static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2582{
2583 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
2584 pid_t tgid = task_tgid_nr_ns(current, ns);
2585 char *name = ERR_PTR(-ENOENT);
2586 if (tgid) {
2587 name = __getname();
2588 if (!name)
2589 name = ERR_PTR(-ENOMEM);
2590 else
2591 sprintf(name, "%d", tgid);
2592 }
2593 nd_set_link(nd, name);
2594 return NULL;
2595}
2596
2597static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2598 void *cookie)
2599{
2600 char *s = nd_get_link(nd);
2601 if (!IS_ERR(s))
2602 __putname(s);
2603}
2604
2605static const struct inode_operations proc_self_inode_operations = {
2606 .readlink = proc_self_readlink,
2607 .follow_link = proc_self_follow_link,
2608 .put_link = proc_self_put_link,
2609};
2610
2611
2612
2613
2614
2615
2616
2617
2618static const struct pid_entry proc_base_stuff[] = {
2619 NOD("self", S_IFLNK|S_IRWXUGO,
2620 &proc_self_inode_operations, NULL, {}),
2621};
2622
2623static struct dentry *proc_base_instantiate(struct inode *dir,
2624 struct dentry *dentry, struct task_struct *task, const void *ptr)
2625{
2626 const struct pid_entry *p = ptr;
2627 struct inode *inode;
2628 struct proc_inode *ei;
2629 struct dentry *error;
2630
2631
2632 error = ERR_PTR(-ENOMEM);
2633 inode = new_inode(dir->i_sb);
2634 if (!inode)
2635 goto out;
2636
2637
2638 ei = PROC_I(inode);
2639 inode->i_ino = get_next_ino();
2640 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
2641
2642
2643
2644
2645 ei->pid = get_task_pid(task, PIDTYPE_PID);
2646 if (!ei->pid)
2647 goto out_iput;
2648
2649 inode->i_mode = p->mode;
2650 if (S_ISDIR(inode->i_mode))
2651 inode->i_nlink = 2;
2652 if (S_ISLNK(inode->i_mode))
2653 inode->i_size = 64;
2654 if (p->iop)
2655 inode->i_op = p->iop;
2656 if (p->fop)
2657 inode->i_fop = p->fop;
2658 ei->op = p->op;
2659 d_add(dentry, inode);
2660 error = NULL;
2661out:
2662 return error;
2663out_iput:
2664 iput(inode);
2665 goto out;
2666}
2667
2668static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2669{
2670 struct dentry *error;
2671 struct task_struct *task = get_proc_task(dir);
2672 const struct pid_entry *p, *last;
2673
2674 error = ERR_PTR(-ENOENT);
2675
2676 if (!task)
2677 goto out_no_task;
2678
2679
2680 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2681 for (p = proc_base_stuff; p <= last; p++) {
2682 if (p->len != dentry->d_name.len)
2683 continue;
2684 if (!memcmp(dentry->d_name.name, p->name, p->len))
2685 break;
2686 }
2687 if (p > last)
2688 goto out;
2689
2690 error = proc_base_instantiate(dir, dentry, task, p);
2691
2692out:
2693 put_task_struct(task);
2694out_no_task:
2695 return error;
2696}
2697
2698static int proc_base_fill_cache(struct file *filp, void *dirent,
2699 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
2700{
2701 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2702 proc_base_instantiate, task, p);
2703}
2704
2705#ifdef CONFIG_TASK_IO_ACCOUNTING
2706static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2707{
2708 struct task_io_accounting acct = task->ioac;
2709 unsigned long flags;
2710
2711 if (whole && lock_task_sighand(task, &flags)) {
2712 struct task_struct *t = task;
2713
2714 task_io_accounting_add(&acct, &task->signal->ioac);
2715 while_each_thread(task, t)
2716 task_io_accounting_add(&acct, &t->ioac);
2717
2718 unlock_task_sighand(task, &flags);
2719 }
2720 return sprintf(buffer,
2721 "rchar: %llu\n"
2722 "wchar: %llu\n"
2723 "syscr: %llu\n"
2724 "syscw: %llu\n"
2725 "read_bytes: %llu\n"
2726 "write_bytes: %llu\n"
2727 "cancelled_write_bytes: %llu\n",
2728 (unsigned long long)acct.rchar,
2729 (unsigned long long)acct.wchar,
2730 (unsigned long long)acct.syscr,
2731 (unsigned long long)acct.syscw,
2732 (unsigned long long)acct.read_bytes,
2733 (unsigned long long)acct.write_bytes,
2734 (unsigned long long)acct.cancelled_write_bytes);
2735}
2736
2737static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2738{
2739 return do_io_accounting(task, buffer, 0);
2740}
2741
2742static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2743{
2744 return do_io_accounting(task, buffer, 1);
2745}
2746#endif
2747
2748static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2749 struct pid *pid, struct task_struct *task)
2750{
2751 seq_printf(m, "%08x\n", task->personality);
2752 return 0;
2753}
2754
2755
2756
2757
2758static const struct file_operations proc_task_operations;
2759static const struct inode_operations proc_task_inode_operations;
2760
2761static const struct pid_entry tgid_base_stuff[] = {
2762 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
2763 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
2764 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
2765#ifdef CONFIG_NET
2766 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
2767#endif
2768 REG("environ", S_IRUSR, proc_environ_operations),
2769 INF("auxv", S_IRUSR, proc_pid_auxv),
2770 ONE("status", S_IRUGO, proc_pid_status),
2771 ONE("personality", S_IRUSR, proc_pid_personality),
2772 INF("limits", S_IRUGO, proc_pid_limits),
2773#ifdef CONFIG_SCHED_DEBUG
2774 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
2775#endif
2776#ifdef CONFIG_SCHED_AUTOGROUP
2777 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
2778#endif
2779 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
2780#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2781 INF("syscall", S_IRUSR, proc_pid_syscall),
2782#endif
2783 INF("cmdline", S_IRUGO, proc_pid_cmdline),
2784 ONE("stat", S_IRUGO, proc_tgid_stat),
2785 ONE("statm", S_IRUGO, proc_pid_statm),
2786 REG("maps", S_IRUGO, proc_maps_operations),
2787#ifdef CONFIG_NUMA
2788 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
2789#endif
2790 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2791 LNK("cwd", proc_cwd_link),
2792 LNK("root", proc_root_link),
2793 LNK("exe", proc_exe_link),
2794 REG("mounts", S_IRUGO, proc_mounts_operations),
2795 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
2796 REG("mountstats", S_IRUSR, proc_mountstats_operations),
2797#ifdef CONFIG_PROC_PAGE_MONITOR
2798 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
2799 REG("smaps", S_IRUGO, proc_smaps_operations),
2800 REG("pagemap", S_IRUSR, proc_pagemap_operations),
2801#endif
2802#ifdef CONFIG_SECURITY
2803 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
2804#endif
2805#ifdef CONFIG_KALLSYMS
2806 INF("wchan", S_IRUGO, proc_pid_wchan),
2807#endif
2808#ifdef CONFIG_STACKTRACE
2809 ONE("stack", S_IRUSR, proc_pid_stack),
2810#endif
2811#ifdef CONFIG_SCHEDSTATS
2812 INF("schedstat", S_IRUGO, proc_pid_schedstat),
2813#endif
2814#ifdef CONFIG_LATENCYTOP
2815 REG("latency", S_IRUGO, proc_lstats_operations),
2816#endif
2817#ifdef CONFIG_PROC_PID_CPUSET
2818 REG("cpuset", S_IRUGO, proc_cpuset_operations),
2819#endif
2820#ifdef CONFIG_CGROUPS
2821 REG("cgroup", S_IRUGO, proc_cgroup_operations),
2822#endif
2823 INF("oom_score", S_IRUGO, proc_oom_score),
2824 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
2825 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
2826#ifdef CONFIG_AUDITSYSCALL
2827 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2828 REG("sessionid", S_IRUGO, proc_sessionid_operations),
2829#endif
2830#ifdef CONFIG_FAULT_INJECTION
2831 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
2832#endif
2833#ifdef CONFIG_ELF_CORE
2834 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
2835#endif
2836#ifdef CONFIG_TASK_IO_ACCOUNTING
2837 INF("io", S_IRUGO, proc_tgid_io_accounting),
2838#endif
2839};
2840
2841static int proc_tgid_base_readdir(struct file * filp,
2842 void * dirent, filldir_t filldir)
2843{
2844 return proc_pident_readdir(filp,dirent,filldir,
2845 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
2846}
2847
2848static const struct file_operations proc_tgid_base_operations = {
2849 .read = generic_read_dir,
2850 .readdir = proc_tgid_base_readdir,
2851 .llseek = default_llseek,
2852};
2853
2854static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
2855 return proc_pident_lookup(dir, dentry,
2856 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
2857}
2858
2859static const struct inode_operations proc_tgid_base_inode_operations = {
2860 .lookup = proc_tgid_base_lookup,
2861 .getattr = pid_getattr,
2862 .setattr = proc_setattr,
2863};
2864
2865static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
2866{
2867 struct dentry *dentry, *leader, *dir;
2868 char buf[PROC_NUMBUF];
2869 struct qstr name;
2870
2871 name.name = buf;
2872 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2873 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
2874 if (dentry) {
2875 shrink_dcache_parent(dentry);
2876 d_drop(dentry);
2877 dput(dentry);
2878 }
2879
2880 name.name = buf;
2881 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
2882 leader = d_hash_and_lookup(mnt->mnt_root, &name);
2883 if (!leader)
2884 goto out;
2885
2886 name.name = "task";
2887 name.len = strlen(name.name);
2888 dir = d_hash_and_lookup(leader, &name);
2889 if (!dir)
2890 goto out_put_leader;
2891
2892 name.name = buf;
2893 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2894 dentry = d_hash_and_lookup(dir, &name);
2895 if (dentry) {
2896 shrink_dcache_parent(dentry);
2897 d_drop(dentry);
2898 dput(dentry);
2899 }
2900
2901 dput(dir);
2902out_put_leader:
2903 dput(leader);
2904out:
2905 return;
2906}
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933void proc_flush_task(struct task_struct *task)
2934{
2935 int i;
2936 struct pid *pid, *tgid;
2937 struct upid *upid;
2938
2939 pid = task_pid(task);
2940 tgid = task_tgid(task);
2941
2942 for (i = 0; i <= pid->level; i++) {
2943 upid = &pid->numbers[i];
2944 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
2945 tgid->numbers[i].nr);
2946 }
2947
2948 upid = &pid->numbers[pid->level];
2949 if (upid->nr == 1)
2950 pid_ns_release_proc(upid->ns);
2951}
2952
2953static struct dentry *proc_pid_instantiate(struct inode *dir,
2954 struct dentry * dentry,
2955 struct task_struct *task, const void *ptr)
2956{
2957 struct dentry *error = ERR_PTR(-ENOENT);
2958 struct inode *inode;
2959
2960 inode = proc_pid_make_inode(dir->i_sb, task);
2961 if (!inode)
2962 goto out;
2963
2964 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2965 inode->i_op = &proc_tgid_base_inode_operations;
2966 inode->i_fop = &proc_tgid_base_operations;
2967 inode->i_flags|=S_IMMUTABLE;
2968
2969 inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff,
2970 ARRAY_SIZE(tgid_base_stuff));
2971
2972 d_set_d_op(dentry, &pid_dentry_operations);
2973
2974 d_add(dentry, inode);
2975
2976 if (pid_revalidate(dentry, NULL))
2977 error = NULL;
2978out:
2979 return error;
2980}
2981
2982struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2983{
2984 struct dentry *result;
2985 struct task_struct *task;
2986 unsigned tgid;
2987 struct pid_namespace *ns;
2988
2989 result = proc_base_lookup(dir, dentry);
2990 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
2991 goto out;
2992
2993 tgid = name_to_int(dentry);
2994 if (tgid == ~0U)
2995 goto out;
2996
2997 ns = dentry->d_sb->s_fs_info;
2998 rcu_read_lock();
2999 task = find_task_by_pid_ns(tgid, ns);
3000 if (task)
3001 get_task_struct(task);
3002 rcu_read_unlock();
3003 if (!task)
3004 goto out;
3005
3006 result = proc_pid_instantiate(dir, dentry, task, NULL);
3007 put_task_struct(task);
3008out:
3009 return result;
3010}
3011
3012
3013
3014
3015
3016struct tgid_iter {
3017 unsigned int tgid;
3018 struct task_struct *task;
3019};
3020static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3021{
3022 struct pid *pid;
3023
3024 if (iter.task)
3025 put_task_struct(iter.task);
3026 rcu_read_lock();
3027retry:
3028 iter.task = NULL;
3029 pid = find_ge_pid(iter.tgid, ns);
3030 if (pid) {
3031 iter.tgid = pid_nr_ns(pid, ns);
3032 iter.task = pid_task(pid, PIDTYPE_PID);
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045 if (!iter.task || !has_group_leader_pid(iter.task)) {
3046 iter.tgid += 1;
3047 goto retry;
3048 }
3049 get_task_struct(iter.task);
3050 }
3051 rcu_read_unlock();
3052 return iter;
3053}
3054
3055#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
3056
3057static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3058 struct tgid_iter iter)
3059{
3060 char name[PROC_NUMBUF];
3061 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
3062 return proc_fill_cache(filp, dirent, filldir, name, len,
3063 proc_pid_instantiate, iter.task, NULL);
3064}
3065
3066
3067int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3068{
3069 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
3070 struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode);
3071 struct tgid_iter iter;
3072 struct pid_namespace *ns;
3073
3074 if (!reaper)
3075 goto out_no_task;
3076
3077 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
3078 const struct pid_entry *p = &proc_base_stuff[nr];
3079 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
3080 goto out;
3081 }
3082
3083 ns = filp->f_dentry->d_sb->s_fs_info;
3084 iter.task = NULL;
3085 iter.tgid = filp->f_pos - TGID_OFFSET;
3086 for (iter = next_tgid(ns, iter);
3087 iter.task;
3088 iter.tgid += 1, iter = next_tgid(ns, iter)) {
3089 filp->f_pos = iter.tgid + TGID_OFFSET;
3090 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
3091 put_task_struct(iter.task);
3092 goto out;
3093 }
3094 }
3095 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3096out:
3097 put_task_struct(reaper);
3098out_no_task:
3099 return 0;
3100}
3101
3102
3103
3104
3105static const struct pid_entry tid_base_stuff[] = {
3106 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3107 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
3108 REG("environ", S_IRUSR, proc_environ_operations),
3109 INF("auxv", S_IRUSR, proc_pid_auxv),
3110 ONE("status", S_IRUGO, proc_pid_status),
3111 ONE("personality", S_IRUSR, proc_pid_personality),
3112 INF("limits", S_IRUGO, proc_pid_limits),
3113#ifdef CONFIG_SCHED_DEBUG
3114 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
3115#endif
3116 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
3117#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3118 INF("syscall", S_IRUSR, proc_pid_syscall),
3119#endif
3120 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3121 ONE("stat", S_IRUGO, proc_tid_stat),
3122 ONE("statm", S_IRUGO, proc_pid_statm),
3123 REG("maps", S_IRUGO, proc_maps_operations),
3124#ifdef CONFIG_NUMA
3125 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
3126#endif
3127 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3128 LNK("cwd", proc_cwd_link),
3129 LNK("root", proc_root_link),
3130 LNK("exe", proc_exe_link),
3131 REG("mounts", S_IRUGO, proc_mounts_operations),
3132 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
3133#ifdef CONFIG_PROC_PAGE_MONITOR
3134 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3135 REG("smaps", S_IRUGO, proc_smaps_operations),
3136 REG("pagemap", S_IRUSR, proc_pagemap_operations),
3137#endif
3138#ifdef CONFIG_SECURITY
3139 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
3140#endif
3141#ifdef CONFIG_KALLSYMS
3142 INF("wchan", S_IRUGO, proc_pid_wchan),
3143#endif
3144#ifdef CONFIG_STACKTRACE
3145 ONE("stack", S_IRUSR, proc_pid_stack),
3146#endif
3147#ifdef CONFIG_SCHEDSTATS
3148 INF("schedstat", S_IRUGO, proc_pid_schedstat),
3149#endif
3150#ifdef CONFIG_LATENCYTOP
3151 REG("latency", S_IRUGO, proc_lstats_operations),
3152#endif
3153#ifdef CONFIG_PROC_PID_CPUSET
3154 REG("cpuset", S_IRUGO, proc_cpuset_operations),
3155#endif
3156#ifdef CONFIG_CGROUPS
3157 REG("cgroup", S_IRUGO, proc_cgroup_operations),
3158#endif
3159 INF("oom_score", S_IRUGO, proc_oom_score),
3160 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
3161 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
3162#ifdef CONFIG_AUDITSYSCALL
3163 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
3164 REG("sessionid", S_IRUSR, proc_sessionid_operations),
3165#endif
3166#ifdef CONFIG_FAULT_INJECTION
3167 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
3168#endif
3169#ifdef CONFIG_TASK_IO_ACCOUNTING
3170 INF("io", S_IRUGO, proc_tid_io_accounting),
3171#endif
3172};
3173
3174static int proc_tid_base_readdir(struct file * filp,
3175 void * dirent, filldir_t filldir)
3176{
3177 return proc_pident_readdir(filp,dirent,filldir,
3178 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3179}
3180
3181static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
3182 return proc_pident_lookup(dir, dentry,
3183 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
3184}
3185
3186static const struct file_operations proc_tid_base_operations = {
3187 .read = generic_read_dir,
3188 .readdir = proc_tid_base_readdir,
3189 .llseek = default_llseek,
3190};
3191
3192static const struct inode_operations proc_tid_base_inode_operations = {
3193 .lookup = proc_tid_base_lookup,
3194 .getattr = pid_getattr,
3195 .setattr = proc_setattr,
3196};
3197
3198static struct dentry *proc_task_instantiate(struct inode *dir,
3199 struct dentry *dentry, struct task_struct *task, const void *ptr)
3200{
3201 struct dentry *error = ERR_PTR(-ENOENT);
3202 struct inode *inode;
3203 inode = proc_pid_make_inode(dir->i_sb, task);
3204
3205 if (!inode)
3206 goto out;
3207 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3208 inode->i_op = &proc_tid_base_inode_operations;
3209 inode->i_fop = &proc_tid_base_operations;
3210 inode->i_flags|=S_IMMUTABLE;
3211
3212 inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff,
3213 ARRAY_SIZE(tid_base_stuff));
3214
3215 d_set_d_op(dentry, &pid_dentry_operations);
3216
3217 d_add(dentry, inode);
3218
3219 if (pid_revalidate(dentry, NULL))
3220 error = NULL;
3221out:
3222 return error;
3223}
3224
3225static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3226{
3227 struct dentry *result = ERR_PTR(-ENOENT);
3228 struct task_struct *task;
3229 struct task_struct *leader = get_proc_task(dir);
3230 unsigned tid;
3231 struct pid_namespace *ns;
3232
3233 if (!leader)
3234 goto out_no_task;
3235
3236 tid = name_to_int(dentry);
3237 if (tid == ~0U)
3238 goto out;
3239
3240 ns = dentry->d_sb->s_fs_info;
3241 rcu_read_lock();
3242 task = find_task_by_pid_ns(tid, ns);
3243 if (task)
3244 get_task_struct(task);
3245 rcu_read_unlock();
3246 if (!task)
3247 goto out;
3248 if (!same_thread_group(leader, task))
3249 goto out_drop_task;
3250
3251 result = proc_task_instantiate(dir, dentry, task, NULL);
3252out_drop_task:
3253 put_task_struct(task);
3254out:
3255 put_task_struct(leader);
3256out_no_task:
3257 return result;
3258}
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272static struct task_struct *first_tid(struct task_struct *leader,
3273 int tid, int nr, struct pid_namespace *ns)
3274{
3275 struct task_struct *pos;
3276
3277 rcu_read_lock();
3278
3279 if (tid && (nr > 0)) {
3280 pos = find_task_by_pid_ns(tid, ns);
3281 if (pos && (pos->group_leader == leader))
3282 goto found;
3283 }
3284
3285
3286 pos = NULL;
3287 if (nr && nr >= get_nr_threads(leader))
3288 goto out;
3289
3290
3291
3292
3293 for (pos = leader; nr > 0; --nr) {
3294 pos = next_thread(pos);
3295 if (pos == leader) {
3296 pos = NULL;
3297 goto out;
3298 }
3299 }
3300found:
3301 get_task_struct(pos);
3302out:
3303 rcu_read_unlock();
3304 return pos;
3305}
3306
3307
3308
3309
3310
3311
3312
3313static struct task_struct *next_tid(struct task_struct *start)
3314{
3315 struct task_struct *pos = NULL;
3316 rcu_read_lock();
3317 if (pid_alive(start)) {
3318 pos = next_thread(start);
3319 if (thread_group_leader(pos))
3320 pos = NULL;
3321 else
3322 get_task_struct(pos);
3323 }
3324 rcu_read_unlock();
3325 put_task_struct(start);
3326 return pos;
3327}
3328
3329static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3330 struct task_struct *task, int tid)
3331{
3332 char name[PROC_NUMBUF];
3333 int len = snprintf(name, sizeof(name), "%d", tid);
3334 return proc_fill_cache(filp, dirent, filldir, name, len,
3335 proc_task_instantiate, task, NULL);
3336}
3337
3338
3339static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3340{
3341 struct dentry *dentry = filp->f_path.dentry;
3342 struct inode *inode = dentry->d_inode;
3343 struct task_struct *leader = NULL;
3344 struct task_struct *task;
3345 int retval = -ENOENT;
3346 ino_t ino;
3347 int tid;
3348 struct pid_namespace *ns;
3349
3350 task = get_proc_task(inode);
3351 if (!task)
3352 goto out_no_task;
3353 rcu_read_lock();
3354 if (pid_alive(task)) {
3355 leader = task->group_leader;
3356 get_task_struct(leader);
3357 }
3358 rcu_read_unlock();
3359 put_task_struct(task);
3360 if (!leader)
3361 goto out_no_task;
3362 retval = 0;
3363
3364 switch ((unsigned long)filp->f_pos) {
3365 case 0:
3366 ino = inode->i_ino;
3367 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
3368 goto out;
3369 filp->f_pos++;
3370
3371 case 1:
3372 ino = parent_ino(dentry);
3373 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
3374 goto out;
3375 filp->f_pos++;
3376
3377 }
3378
3379
3380
3381
3382 ns = filp->f_dentry->d_sb->s_fs_info;
3383 tid = (int)filp->f_version;
3384 filp->f_version = 0;
3385 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
3386 task;
3387 task = next_tid(task), filp->f_pos++) {
3388 tid = task_pid_nr_ns(task, ns);
3389 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
3390
3391
3392 filp->f_version = (u64)tid;
3393 put_task_struct(task);
3394 break;
3395 }
3396 }
3397out:
3398 put_task_struct(leader);
3399out_no_task:
3400 return retval;
3401}
3402
3403static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3404{
3405 struct inode *inode = dentry->d_inode;
3406 struct task_struct *p = get_proc_task(inode);
3407 generic_fillattr(inode, stat);
3408
3409 if (p) {
3410 stat->nlink += get_nr_threads(p);
3411 put_task_struct(p);
3412 }
3413
3414 return 0;
3415}
3416
3417static const struct inode_operations proc_task_inode_operations = {
3418 .lookup = proc_task_lookup,
3419 .getattr = proc_task_getattr,
3420 .setattr = proc_setattr,
3421};
3422
3423static const struct file_operations proc_task_operations = {
3424 .read = generic_read_dir,
3425 .readdir = proc_task_readdir,
3426 .llseek = default_llseek,
3427};
3428