LXR linux/include/linux/compat.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_COMPAT_H
   3#define _LINUX_COMPAT_H
   4/*
   5 * These are the type definitions for the architecture specific
   6 * syscall compatibility layer.
   7 */
   8
   9#include <linux/types.h>
  10#include <linux/time.h>
  11
  12#include <linux/stat.h>
  13#include <linux/param.h>        /* for HZ */
  14#include <linux/sem.h>
  15#include <linux/socket.h>
  16#include <linux/if.h>
  17#include <linux/fs.h>
  18#include <linux/aio_abi.h>      /* for aio_context_t */
  19#include <linux/uaccess.h>
  20#include <linux/unistd.h>
  21
  22#include <asm/compat.h>
  23
  24#ifdef CONFIG_COMPAT
  25#include <asm/siginfo.h>
  26#include <asm/signal.h>
  27#endif
  28
  29#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
  30/*
  31 * It may be useful for an architecture to override the definitions of the
  32 * COMPAT_SYSCALL_DEFINE0 and COMPAT_SYSCALL_DEFINEx() macros, in particular
  33 * to use a different calling convention for syscalls. To allow for that,
  34 + the prototypes for the compat_sys_*() functions below will *not* be included
  35 * if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
  36 */
  37#include <asm/syscall_wrapper.h>
  38#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
  39
  40#ifndef COMPAT_USE_64BIT_TIME
  41#define COMPAT_USE_64BIT_TIME 0
  42#endif
  43
  44#ifndef __SC_DELOUSE
  45#define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
  46#endif
  47
  48#ifndef COMPAT_SYSCALL_DEFINE0
  49#define COMPAT_SYSCALL_DEFINE0(name) \
  50        asmlinkage long compat_sys_##name(void); \
  51        ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
  52        asmlinkage long compat_sys_##name(void)
  53#endif /* COMPAT_SYSCALL_DEFINE0 */
  54
  55#define COMPAT_SYSCALL_DEFINE1(name, ...) \
  56        COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
  57#define COMPAT_SYSCALL_DEFINE2(name, ...) \
  58        COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
  59#define COMPAT_SYSCALL_DEFINE3(name, ...) \
  60        COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
  61#define COMPAT_SYSCALL_DEFINE4(name, ...) \
  62        COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
  63#define COMPAT_SYSCALL_DEFINE5(name, ...) \
  64        COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
  65#define COMPAT_SYSCALL_DEFINE6(name, ...) \
  66        COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
  67
  68/*
  69 * The asmlinkage stub is aliased to a function named __se_compat_sys_*() which
  70 * sign-extends 32-bit ints to longs whenever needed. The actual work is
  71 * done within __do_compat_sys_*().
  72 */
  73#ifndef COMPAT_SYSCALL_DEFINEx
  74#define COMPAT_SYSCALL_DEFINEx(x, name, ...)                                    \
  75        __diag_push();                                                          \
  76        __diag_ignore(GCC, 8, "-Wattribute-alias",                              \
  77                      "Type aliasing is used to sanitize syscall arguments");\
  78        asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));       \
  79        asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))        \
  80                __attribute__((alias(__stringify(__se_compat_sys##name))));     \
  81        ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO);                         \
  82        static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  83        asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));  \
  84        asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))   \
  85        {                                                                       \
  86                long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
  87                __MAP(x,__SC_TEST,__VA_ARGS__);                                 \
  88                return ret;                                                     \
  89        }                                                                       \
  90        __diag_pop();                                                           \
  91        static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
  92#endif /* COMPAT_SYSCALL_DEFINEx */
  93
  94#ifdef CONFIG_COMPAT
  95
  96#ifndef compat_user_stack_pointer
  97#define compat_user_stack_pointer() current_user_stack_pointer()
  98#endif
  99#ifndef compat_sigaltstack      /* we'll need that for MIPS */
 100typedef struct compat_sigaltstack {
 101        compat_uptr_t                   ss_sp;
 102        int                             ss_flags;
 103        compat_size_t                   ss_size;
 104} compat_stack_t;
 105#endif
 106#ifndef COMPAT_MINSIGSTKSZ
 107#define COMPAT_MINSIGSTKSZ      MINSIGSTKSZ
 108#endif
 109
 110#define compat_jiffies_to_clock_t(x)    \
 111                (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
 112
 113typedef __compat_uid32_t        compat_uid_t;
 114typedef __compat_gid32_t        compat_gid_t;
 115
 116struct compat_sel_arg_struct;
 117struct rusage;
 118
 119struct old_itimerval32;
 120
 121struct compat_tms {
 122        compat_clock_t          tms_utime;
 123        compat_clock_t          tms_stime;
 124        compat_clock_t          tms_cutime;
 125        compat_clock_t          tms_cstime;
 126};
 127
 128#define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 129
 130typedef struct {
 131        compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 132} compat_sigset_t;
 133
 134int set_compat_user_sigmask(const compat_sigset_t __user *umask,
 135                            size_t sigsetsize);
 136
 137struct compat_sigaction {
 138#ifndef __ARCH_HAS_IRIX_SIGACTION
 139        compat_uptr_t                   sa_handler;
 140        compat_ulong_t                  sa_flags;
 141#else
 142        compat_uint_t                   sa_flags;
 143        compat_uptr_t                   sa_handler;
 144#endif
 145#ifdef __ARCH_HAS_SA_RESTORER
 146        compat_uptr_t                   sa_restorer;
 147#endif
 148        compat_sigset_t                 sa_mask __packed;
 149};
 150
 151typedef union compat_sigval {
 152        compat_int_t    sival_int;
 153        compat_uptr_t   sival_ptr;
 154} compat_sigval_t;
 155
 156typedef struct compat_siginfo {
 157        int si_signo;
 158#ifndef __ARCH_HAS_SWAPPED_SIGINFO
 159        int si_errno;
 160        int si_code;
 161#else
 162        int si_code;
 163        int si_errno;
 164#endif
 165
 166        union {
 167                int _pad[128/sizeof(int) - 3];
 168
 169                /* kill() */
 170                struct {
 171                        compat_pid_t _pid;      /* sender's pid */
 172                        __compat_uid32_t _uid;  /* sender's uid */
 173                } _kill;
 174
 175                /* POSIX.1b timers */
 176                struct {
 177                        compat_timer_t _tid;    /* timer id */
 178                        int _overrun;           /* overrun count */
 179                        compat_sigval_t _sigval;        /* same as below */
 180                } _timer;
 181
 182                /* POSIX.1b signals */
 183                struct {
 184                        compat_pid_t _pid;      /* sender's pid */
 185                        __compat_uid32_t _uid;  /* sender's uid */
 186                        compat_sigval_t _sigval;
 187                } _rt;
 188
 189                /* SIGCHLD */
 190                struct {
 191                        compat_pid_t _pid;      /* which child */
 192                        __compat_uid32_t _uid;  /* sender's uid */
 193                        int _status;            /* exit code */
 194                        compat_clock_t _utime;
 195                        compat_clock_t _stime;
 196                } _sigchld;
 197
 198#ifdef CONFIG_X86_X32_ABI
 199                /* SIGCHLD (x32 version) */
 200                struct {
 201                        compat_pid_t _pid;      /* which child */
 202                        __compat_uid32_t _uid;  /* sender's uid */
 203                        int _status;            /* exit code */
 204                        compat_s64 _utime;
 205                        compat_s64 _stime;
 206                } _sigchld_x32;
 207#endif
 208
 209                /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 210                struct {
 211                        compat_uptr_t _addr;    /* faulting insn/memory ref. */
 212#ifdef __ARCH_SI_TRAPNO
 213                        int _trapno;    /* TRAP # which caused the signal */
 214#endif
 215#define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 216                                     sizeof(short) : __alignof__(compat_uptr_t))
 217                        union {
 218                                /*
 219                                 * used when si_code=BUS_MCEERR_AR or
 220                                 * used when si_code=BUS_MCEERR_AO
 221                                 */
 222                                short int _addr_lsb;    /* Valid LSB of the reported address. */
 223                                /* used when si_code=SEGV_BNDERR */
 224                                struct {
 225                                        char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
 226                                        compat_uptr_t _lower;
 227                                        compat_uptr_t _upper;
 228                                } _addr_bnd;
 229                                /* used when si_code=SEGV_PKUERR */
 230                                struct {
 231                                        char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
 232                                        u32 _pkey;
 233                                } _addr_pkey;
 234                        };
 235                } _sigfault;
 236
 237                /* SIGPOLL */
 238                struct {
 239                        compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 240                        int _fd;
 241                } _sigpoll;
 242
 243                struct {
 244                        compat_uptr_t _call_addr; /* calling user insn */
 245                        int _syscall;   /* triggering system call number */
 246                        unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 247                } _sigsys;
 248        } _sifields;
 249} compat_siginfo_t;
 250
 251struct compat_iovec {
 252        compat_uptr_t   iov_base;
 253        compat_size_t   iov_len;
 254};
 255
 256struct compat_rlimit {
 257        compat_ulong_t  rlim_cur;
 258        compat_ulong_t  rlim_max;
 259};
 260
 261struct compat_rusage {
 262        struct old_timeval32 ru_utime;
 263        struct old_timeval32 ru_stime;
 264        compat_long_t   ru_maxrss;
 265        compat_long_t   ru_ixrss;
 266        compat_long_t   ru_idrss;
 267        compat_long_t   ru_isrss;
 268        compat_long_t   ru_minflt;
 269        compat_long_t   ru_majflt;
 270        compat_long_t   ru_nswap;
 271        compat_long_t   ru_inblock;
 272        compat_long_t   ru_oublock;
 273        compat_long_t   ru_msgsnd;
 274        compat_long_t   ru_msgrcv;
 275        compat_long_t   ru_nsignals;
 276        compat_long_t   ru_nvcsw;
 277        compat_long_t   ru_nivcsw;
 278};
 279
 280extern int put_compat_rusage(const struct rusage *,
 281                             struct compat_rusage __user *);
 282
 283struct compat_siginfo;
 284struct __compat_aio_sigset;
 285
 286struct compat_dirent {
 287        u32             d_ino;
 288        compat_off_t    d_off;
 289        u16             d_reclen;
 290        char            d_name[256];
 291};
 292
 293struct compat_ustat {
 294        compat_daddr_t          f_tfree;
 295        compat_ino_t            f_tinode;
 296        char                    f_fname[6];
 297        char                    f_fpack[6];
 298};
 299
 300#define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 301
 302typedef struct compat_sigevent {
 303        compat_sigval_t sigev_value;
 304        compat_int_t sigev_signo;
 305        compat_int_t sigev_notify;
 306        union {
 307                compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 308                compat_int_t _tid;
 309
 310                struct {
 311                        compat_uptr_t _function;
 312                        compat_uptr_t _attribute;
 313                } _sigev_thread;
 314        } _sigev_un;
 315} compat_sigevent_t;
 316
 317struct compat_ifmap {
 318        compat_ulong_t mem_start;
 319        compat_ulong_t mem_end;
 320        unsigned short base_addr;
 321        unsigned char irq;
 322        unsigned char dma;
 323        unsigned char port;
 324};
 325
 326struct compat_if_settings {
 327        unsigned int type;      /* Type of physical device or protocol */
 328        unsigned int size;      /* Size of the data allocated by the caller */
 329        compat_uptr_t ifs_ifsu; /* union of pointers */
 330};
 331
 332struct compat_ifreq {
 333        union {
 334                char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 335        } ifr_ifrn;
 336        union {
 337                struct  sockaddr ifru_addr;
 338                struct  sockaddr ifru_dstaddr;
 339                struct  sockaddr ifru_broadaddr;
 340                struct  sockaddr ifru_netmask;
 341                struct  sockaddr ifru_hwaddr;
 342                short   ifru_flags;
 343                compat_int_t    ifru_ivalue;
 344                compat_int_t    ifru_mtu;
 345                struct  compat_ifmap ifru_map;
 346                char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 347                char    ifru_newname[IFNAMSIZ];
 348                compat_caddr_t  ifru_data;
 349                struct  compat_if_settings ifru_settings;
 350        } ifr_ifru;
 351};
 352
 353struct compat_ifconf {
 354        compat_int_t    ifc_len;                /* size of buffer */
 355        compat_caddr_t  ifcbuf;
 356};
 357
 358struct compat_robust_list {
 359        compat_uptr_t                   next;
 360};
 361
 362struct compat_robust_list_head {
 363        struct compat_robust_list       list;
 364        compat_long_t                   futex_offset;
 365        compat_uptr_t                   list_op_pending;
 366};
 367
 368#ifdef CONFIG_COMPAT_OLD_SIGACTION
 369struct compat_old_sigaction {
 370        compat_uptr_t                   sa_handler;
 371        compat_old_sigset_t             sa_mask;
 372        compat_ulong_t                  sa_flags;
 373        compat_uptr_t                   sa_restorer;
 374};
 375#endif
 376
 377struct compat_keyctl_kdf_params {
 378        compat_uptr_t hashname;
 379        compat_uptr_t otherinfo;
 380        __u32 otherinfolen;
 381        __u32 __spare[8];
 382};
 383
 384struct compat_statfs;
 385struct compat_statfs64;
 386struct compat_old_linux_dirent;
 387struct compat_linux_dirent;
 388struct linux_dirent64;
 389struct compat_msghdr;
 390struct compat_mmsghdr;
 391struct compat_sysinfo;
 392struct compat_sysctl_args;
 393struct compat_kexec_segment;
 394struct compat_mq_attr;
 395struct compat_msgbuf;
 396
 397#define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 398
 399#define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 400
 401long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 402                       unsigned long bitmap_size);
 403long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 404                       unsigned long bitmap_size);
 405void copy_siginfo_to_external32(struct compat_siginfo *to,
 406                const struct kernel_siginfo *from);
 407int copy_siginfo_from_user32(kernel_siginfo_t *to,
 408                const struct compat_siginfo __user *from);
 409int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
 410                const kernel_siginfo_t *from);
 411#ifndef copy_siginfo_to_user32
 412#define copy_siginfo_to_user32 __copy_siginfo_to_user32
 413#endif
 414int get_compat_sigevent(struct sigevent *event,
 415                const struct compat_sigevent __user *u_event);
 416
 417extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 418
 419/*
 420 * Defined inline such that size can be compile time constant, which avoids
 421 * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 422 */
 423static inline int
 424put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 425                  unsigned int size)
 426{
 427        /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 428#ifdef __BIG_ENDIAN
 429        compat_sigset_t v;
 430        switch (_NSIG_WORDS) {
 431        case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 432                fallthrough;
 433        case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 434                fallthrough;
 435        case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 436                fallthrough;
 437        case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 438        }
 439        return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 440#else
 441        return copy_to_user(compat, set, size) ? -EFAULT : 0;
 442#endif
 443}
 444
 445extern int compat_ptrace_request(struct task_struct *child,
 446                                 compat_long_t request,
 447                                 compat_ulong_t addr, compat_ulong_t data);
 448
 449extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 450                               compat_ulong_t addr, compat_ulong_t data);
 451
 452struct epoll_event;     /* fortunately, this one is fixed-layout */
 453
 454extern ssize_t compat_rw_copy_check_uvector(int type,
 455                const struct compat_iovec __user *uvector,
 456                unsigned long nr_segs,
 457                unsigned long fast_segs, struct iovec *fast_pointer,
 458                struct iovec **ret_pointer);
 459
 460extern void __user *compat_alloc_user_space(unsigned long len);
 461
 462int compat_restore_altstack(const compat_stack_t __user *uss);
 463int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 464#define unsafe_compat_save_altstack(uss, sp, label) do { \
 465        compat_stack_t __user *__uss = uss; \
 466        struct task_struct *t = current; \
 467        unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
 468                        &__uss->ss_sp, label); \
 469        unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
 470        unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
 471        if (t->sas_ss_flags & SS_AUTODISARM) \
 472                sas_ss_reset(t); \
 473} while (0);
 474
 475/*
 476 * These syscall function prototypes are kept in the same order as
 477 * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 478 * go below.
 479 *
 480 * Please note that these prototypes here are only provided for information
 481 * purposes, for static analysis, and for linking from the syscall table.
 482 * These functions should not be called elsewhere from kernel code.
 483 *
 484 * As the syscall calling convention may be different from the default
 485 * for architectures overriding the syscall calling convention, do not
 486 * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 487 */
 488#ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 489asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 490asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 491                                     u32 __user *iocb);
 492asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 493                                        compat_long_t min_nr,
 494                                        compat_long_t nr,
 495                                        struct io_event __user *events,
 496                                        struct old_timespec32 __user *timeout,
 497                                        const struct __compat_aio_sigset __user *usig);
 498asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 499                                        compat_long_t min_nr,
 500                                        compat_long_t nr,
 501                                        struct io_event __user *events,
 502                                        struct __kernel_timespec __user *timeout,
 503                                        const struct __compat_aio_sigset __user *usig);
 504
 505/* fs/cookies.c */
 506asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 507
 508/* fs/eventpoll.c */
 509asmlinkage long compat_sys_epoll_pwait(int epfd,
 510                        struct epoll_event __user *events,
 511                        int maxevents, int timeout,
 512                        const compat_sigset_t __user *sigmask,
 513                        compat_size_t sigsetsize);
 514
 515/* fs/fcntl.c */
 516asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 517                                 compat_ulong_t arg);
 518asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 519                                   compat_ulong_t arg);
 520
 521/* fs/ioctl.c */
 522asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 523                                 compat_ulong_t arg);
 524
 525/* fs/namespace.c */
 526asmlinkage long compat_sys_mount(const char __user *dev_name,
 527                                 const char __user *dir_name,
 528                                 const char __user *type, compat_ulong_t flags,
 529                                 const void __user *data);
 530
 531/* fs/open.c */
 532asmlinkage long compat_sys_statfs(const char __user *pathname,
 533                                  struct compat_statfs __user *buf);
 534asmlinkage long compat_sys_statfs64(const char __user *pathname,
 535                                    compat_size_t sz,
 536                                    struct compat_statfs64 __user *buf);
 537asmlinkage long compat_sys_fstatfs(unsigned int fd,
 538                                   struct compat_statfs __user *buf);
 539asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 540                                     struct compat_statfs64 __user *buf);
 541asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 542asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 543/* No generic prototype for truncate64, ftruncate64, fallocate */
 544asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 545                                  int flags, umode_t mode);
 546
 547/* fs/readdir.c */
 548asmlinkage long compat_sys_getdents(unsigned int fd,
 549                                    struct compat_linux_dirent __user *dirent,
 550                                    unsigned int count);
 551
 552/* fs/read_write.c */
 553asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 554asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 555                const struct compat_iovec __user *vec, compat_ulong_t vlen);
 556asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 557                const struct compat_iovec __user *vec, compat_ulong_t vlen);
 558/* No generic prototype for pread64 and pwrite64 */
 559asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 560                const struct compat_iovec __user *vec,
 561                compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 562asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 563                const struct compat_iovec __user *vec,
 564                compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 565#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 566asmlinkage long compat_sys_preadv64(unsigned long fd,
 567                const struct compat_iovec __user *vec,
 568                unsigned long vlen, loff_t pos);
 569#endif
 570
 571#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 572asmlinkage long compat_sys_pwritev64(unsigned long fd,
 573                const struct compat_iovec __user *vec,
 574                unsigned long vlen, loff_t pos);
 575#endif
 576
 577/* fs/sendfile.c */
 578asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 579                                    compat_off_t __user *offset, compat_size_t count);
 580asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 581                                    compat_loff_t __user *offset, compat_size_t count);
 582
 583/* fs/select.c */
 584asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 585                                    compat_ulong_t __user *outp,
 586                                    compat_ulong_t __user *exp,
 587                                    struct old_timespec32 __user *tsp,
 588                                    void __user *sig);
 589asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 590                                    compat_ulong_t __user *outp,
 591                                    compat_ulong_t __user *exp,
 592                                    struct __kernel_timespec __user *tsp,
 593                                    void __user *sig);
 594asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 595                                 unsigned int nfds,
 596                                 struct old_timespec32 __user *tsp,
 597                                 const compat_sigset_t __user *sigmask,
 598                                 compat_size_t sigsetsize);
 599asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 600                                 unsigned int nfds,
 601                                 struct __kernel_timespec __user *tsp,
 602                                 const compat_sigset_t __user *sigmask,
 603                                 compat_size_t sigsetsize);
 604
 605/* fs/signalfd.c */
 606asmlinkage long compat_sys_signalfd4(int ufd,
 607                                     const compat_sigset_t __user *sigmask,
 608                                     compat_size_t sigsetsize, int flags);
 609
 610/* fs/splice.c */
 611asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 612                                    unsigned int nr_segs, unsigned int flags);
 613
 614/* fs/stat.c */
 615asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 616                                      const char __user *filename,
 617                                      struct compat_stat __user *statbuf,
 618                                      int flag);
 619asmlinkage long compat_sys_newfstat(unsigned int fd,
 620                                    struct compat_stat __user *statbuf);
 621
 622/* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 623
 624/* kernel/exit.c */
 625asmlinkage long compat_sys_waitid(int, compat_pid_t,
 626                struct compat_siginfo __user *, int,
 627                struct compat_rusage __user *);
 628
 629
 630
 631/* kernel/futex.c */
 632asmlinkage long
 633compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 634                           compat_size_t len);
 635asmlinkage long
 636compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 637                           compat_size_t __user *len_ptr);
 638
 639/* kernel/itimer.c */
 640asmlinkage long compat_sys_getitimer(int which,
 641                                     struct old_itimerval32 __user *it);
 642asmlinkage long compat_sys_setitimer(int which,
 643                                     struct old_itimerval32 __user *in,
 644                                     struct old_itimerval32 __user *out);
 645
 646/* kernel/kexec.c */
 647asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 648                                      compat_ulong_t nr_segments,
 649                                      struct compat_kexec_segment __user *,
 650                                      compat_ulong_t flags);
 651
 652/* kernel/posix-timers.c */
 653asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 654                        struct compat_sigevent __user *timer_event_spec,
 655                        timer_t __user *created_timer_id);
 656
 657/* kernel/ptrace.c */
 658asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 659                                  compat_long_t addr, compat_long_t data);
 660
 661/* kernel/sched/core.c */
 662asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 663                                     unsigned int len,
 664                                     compat_ulong_t __user *user_mask_ptr);
 665asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 666                                     unsigned int len,
 667                                     compat_ulong_t __user *user_mask_ptr);
 668
 669/* kernel/signal.c */
 670asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 671                                       compat_stack_t __user *uoss_ptr);
 672asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 673                                         compat_size_t sigsetsize);
 674#ifndef CONFIG_ODD_RT_SIGACTION
 675asmlinkage long compat_sys_rt_sigaction(int,
 676                                 const struct compat_sigaction __user *,
 677                                 struct compat_sigaction __user *,
 678                                 compat_size_t);
 679#endif
 680asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 681                                          compat_sigset_t __user *oset,
 682                                          compat_size_t sigsetsize);
 683asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 684                                         compat_size_t sigsetsize);
 685asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 686                struct compat_siginfo __user *uinfo,
 687                struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 688asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 689                struct compat_siginfo __user *uinfo,
 690                struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 691asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 692                                struct compat_siginfo __user *uinfo);
 693/* No generic prototype for rt_sigreturn */
 694
 695/* kernel/sys.c */
 696asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 697asmlinkage long compat_sys_getrlimit(unsigned int resource,
 698                                     struct compat_rlimit __user *rlim);
 699asmlinkage long compat_sys_setrlimit(unsigned int resource,
 700                                     struct compat_rlimit __user *rlim);
 701asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 702
 703/* kernel/time.c */
 704asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 705                struct timezone __user *tz);
 706asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 707                struct timezone __user *tz);
 708
 709/* kernel/timer.c */
 710asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 711
 712/* ipc/mqueue.c */
 713asmlinkage long compat_sys_mq_open(const char __user *u_name,
 714                        int oflag, compat_mode_t mode,
 715                        struct compat_mq_attr __user *u_attr);
 716asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 717                        const struct compat_sigevent __user *u_notification);
 718asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 719                        const struct compat_mq_attr __user *u_mqstat,
 720                        struct compat_mq_attr __user *u_omqstat);
 721
 722/* ipc/msg.c */
 723asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 724asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 725                compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 726asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 727                compat_ssize_t msgsz, int msgflg);
 728
 729/* ipc/sem.c */
 730asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 731
 732/* ipc/shm.c */
 733asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 734asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 735
 736/* net/socket.c */
 737asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 738                            unsigned flags, struct sockaddr __user *addr,
 739                            int __user *addrlen);
 740asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 741                                   unsigned flags);
 742asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 743                                   unsigned int flags);
 744
 745/* mm/filemap.c: No generic prototype for readahead */
 746
 747/* security/keys/keyctl.c */
 748asmlinkage long compat_sys_keyctl(u32 option,
 749                              u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 750
 751/* arch/example/kernel/sys_example.c */
 752asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 753                     const compat_uptr_t __user *envp);
 754
 755/* mm/fadvise.c: No generic prototype for fadvise64_64 */
 756
 757/* mm/, CONFIG_MMU only */
 758asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 759                                 compat_ulong_t mode,
 760                                 compat_ulong_t __user *nmask,
 761                                 compat_ulong_t maxnode, compat_ulong_t flags);
 762asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 763                                         compat_ulong_t __user *nmask,
 764                                         compat_ulong_t maxnode,
 765                                         compat_ulong_t addr,
 766                                         compat_ulong_t flags);
 767asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 768                                         compat_ulong_t maxnode);
 769asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 770                compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 771                const compat_ulong_t __user *new_nodes);
 772asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 773                                      __u32 __user *pages,
 774                                      const int __user *nodes,
 775                                      int __user *status,
 776                                      int flags);
 777
 778asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 779                                        compat_pid_t pid, int sig,
 780                                        struct compat_siginfo __user *uinfo);
 781asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 782                                    unsigned vlen, unsigned int flags,
 783                                    struct __kernel_timespec __user *timeout);
 784asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 785                                    unsigned vlen, unsigned int flags,
 786                                    struct old_timespec32 __user *timeout);
 787asmlinkage long compat_sys_wait4(compat_pid_t pid,
 788                                 compat_uint_t __user *stat_addr, int options,
 789                                 struct compat_rusage __user *ru);
 790asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 791                                            int, const char __user *);
 792asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 793                                             struct file_handle __user *handle,
 794                                             int flags);
 795asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 796                                    unsigned vlen, unsigned int flags);
 797asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 798                const struct compat_iovec __user *lvec,
 799                compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 800                compat_ulong_t riovcnt, compat_ulong_t flags);
 801asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 802                const struct compat_iovec __user *lvec,
 803                compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 804                compat_ulong_t riovcnt, compat_ulong_t flags);
 805asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 806                     const compat_uptr_t __user *argv,
 807                     const compat_uptr_t __user *envp, int flags);
 808asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 809                const struct compat_iovec __user *vec,
 810                compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 811asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 812                const struct compat_iovec __user *vec,
 813                compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 814#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 815asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 816                const struct compat_iovec __user *vec,
 817                unsigned long vlen, loff_t pos, rwf_t flags);
 818#endif
 819
 820#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 821asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 822                const struct compat_iovec __user *vec,
 823                unsigned long vlen, loff_t pos, rwf_t flags);
 824#endif
 825
 826
 827/*
 828 * Deprecated system calls which are still defined in
 829 * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 830 */
 831
 832/* __ARCH_WANT_SYSCALL_NO_AT */
 833asmlinkage long compat_sys_open(const char __user *filename, int flags,
 834                                umode_t mode);
 835
 836/* __ARCH_WANT_SYSCALL_NO_FLAGS */
 837asmlinkage long compat_sys_signalfd(int ufd,
 838                                    const compat_sigset_t __user *sigmask,
 839                                    compat_size_t sigsetsize);
 840
 841/* __ARCH_WANT_SYSCALL_OFF_T */
 842asmlinkage long compat_sys_newstat(const char __user *filename,
 843                                   struct compat_stat __user *statbuf);
 844asmlinkage long compat_sys_newlstat(const char __user *filename,
 845                                    struct compat_stat __user *statbuf);
 846
 847/* __ARCH_WANT_SYSCALL_DEPRECATED */
 848asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 849                compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 850                struct old_timeval32 __user *tvp);
 851asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 852asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 853                                unsigned flags);
 854
 855/* obsolete: fs/readdir.c */
 856asmlinkage long compat_sys_old_readdir(unsigned int fd,
 857                                       struct compat_old_linux_dirent __user *,
 858                                       unsigned int count);
 859
 860/* obsolete: fs/select.c */
 861asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 862
 863/* obsolete: ipc */
 864asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 865
 866/* obsolete: kernel/signal.c */
 867#ifdef __ARCH_WANT_SYS_SIGPENDING
 868asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 869#endif
 870
 871#ifdef __ARCH_WANT_SYS_SIGPROCMASK
 872asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 873                                       compat_old_sigset_t __user *oset);
 874#endif
 875#ifdef CONFIG_COMPAT_OLD_SIGACTION
 876asmlinkage long compat_sys_sigaction(int sig,
 877                                   const struct compat_old_sigaction __user *act,
 878                                   struct compat_old_sigaction __user *oact);
 879#endif
 880
 881/* obsolete: net/socket.c */
 882asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 883
 884#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 885
 886
 887/*
 888 * For most but not all architectures, "am I in a compat syscall?" and
 889 * "am I a compat task?" are the same question.  For architectures on which
 890 * they aren't the same question, arch code can override in_compat_syscall.
 891 */
 892
 893#ifndef in_compat_syscall
 894static inline bool in_compat_syscall(void) { return is_compat_task(); }
 895#endif
 896
 897/**
 898 * ns_to_old_timeval32 - Compat version of ns_to_timeval
 899 * @nsec:       the nanoseconds value to be converted
 900 *
 901 * Returns the old_timeval32 representation of the nsec parameter.
 902 */
 903static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
 904{
 905        struct __kernel_old_timeval tv;
 906        struct old_timeval32 ctv;
 907
 908        tv = ns_to_kernel_old_timeval(nsec);
 909        ctv.tv_sec = tv.tv_sec;
 910        ctv.tv_usec = tv.tv_usec;
 911
 912        return ctv;
 913}
 914
 915/*
 916 * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 917 * directly.  Instead, use one of the functions which work equivalently, such
 918 * as the kcompat_sys_xyzyyz() functions prototyped below.
 919 */
 920
 921int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 922                     struct compat_statfs64 __user * buf);
 923int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 924                          struct compat_statfs64 __user * buf);
 925
 926#else /* !CONFIG_COMPAT */
 927
 928#define is_compat_task() (0)
 929/* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
 930#define in_compat_syscall in_compat_syscall
 931static inline bool in_compat_syscall(void) { return false; }
 932
 933#endif /* CONFIG_COMPAT */
 934
 935/*
 936 * A pointer passed in from user mode. This should not
 937 * be used for syscall parameters, just declare them
 938 * as pointers because the syscall entry code will have
 939 * appropriately converted them already.
 940 */
 941#ifndef compat_ptr
 942static inline void __user *compat_ptr(compat_uptr_t uptr)
 943{
 944        return (void __user *)(unsigned long)uptr;
 945}
 946#endif
 947
 948static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 949{
 950        return (u32)(unsigned long)uptr;
 951}
 952
 953#endif /* _LINUX_COMPAT_H */
 954