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 */
 100 typedef 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
 113 typedef __compat_uid32_t        compat_uid_t;
 114 typedef __compat_gid32_t        compat_gid_t;
 115
 116 struct compat_sel_arg_struct;
 117 struct rusage;
 118
 119 struct old_itimerval32;
 120
 121 struct 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
 130 typedef struct {
 131         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 132 } compat_sigset_t;
 133
 134 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
 135                             size_t sigsetsize);
 136
 137 struct 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
 151 typedef union compat_sigval {
 152         compat_int_t    sival_int;
 153         compat_uptr_t   sival_ptr;
 154 } compat_sigval_t;
 155
 156 typedef 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
 251 /*
 252  * These functions operate on 32- or 64-bit specs depending on
 253  * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments.
 254  */
 255 extern int compat_get_timespec(struct timespec *, const void __user *);
 256 extern int compat_put_timespec(const struct timespec *, void __user *);
 257 extern int compat_get_timeval(struct timeval *, const void __user *);
 258 extern int compat_put_timeval(const struct timeval *, void __user *);
 259
 260 struct compat_iovec {
 261         compat_uptr_t   iov_base;
 262         compat_size_t   iov_len;
 263 };
 264
 265 struct compat_rlimit {
 266         compat_ulong_t  rlim_cur;
 267         compat_ulong_t  rlim_max;
 268 };
 269
 270 struct compat_rusage {
 271         struct old_timeval32 ru_utime;
 272         struct old_timeval32 ru_stime;
 273         compat_long_t   ru_maxrss;
 274         compat_long_t   ru_ixrss;
 275         compat_long_t   ru_idrss;
 276         compat_long_t   ru_isrss;
 277         compat_long_t   ru_minflt;
 278         compat_long_t   ru_majflt;
 279         compat_long_t   ru_nswap;
 280         compat_long_t   ru_inblock;
 281         compat_long_t   ru_oublock;
 282         compat_long_t   ru_msgsnd;
 283         compat_long_t   ru_msgrcv;
 284         compat_long_t   ru_nsignals;
 285         compat_long_t   ru_nvcsw;
 286         compat_long_t   ru_nivcsw;
 287 };
 288
 289 extern int put_compat_rusage(const struct rusage *,
 290                              struct compat_rusage __user *);
 291
 292 struct compat_siginfo;
 293 struct __compat_aio_sigset;
 294
 295 struct compat_dirent {
 296         u32             d_ino;
 297         compat_off_t    d_off;
 298         u16             d_reclen;
 299         char            d_name[256];
 300 };
 301
 302 struct compat_ustat {
 303         compat_daddr_t          f_tfree;
 304         compat_ino_t            f_tinode;
 305         char                    f_fname[6];
 306         char                    f_fpack[6];
 307 };
 308
 309 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 310
 311 typedef struct compat_sigevent {
 312         compat_sigval_t sigev_value;
 313         compat_int_t sigev_signo;
 314         compat_int_t sigev_notify;
 315         union {
 316                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 317                 compat_int_t _tid;
 318
 319                 struct {
 320                         compat_uptr_t _function;
 321                         compat_uptr_t _attribute;
 322                 } _sigev_thread;
 323         } _sigev_un;
 324 } compat_sigevent_t;
 325
 326 struct compat_ifmap {
 327         compat_ulong_t mem_start;
 328         compat_ulong_t mem_end;
 329         unsigned short base_addr;
 330         unsigned char irq;
 331         unsigned char dma;
 332         unsigned char port;
 333 };
 334
 335 struct compat_if_settings {
 336         unsigned int type;      /* Type of physical device or protocol */
 337         unsigned int size;      /* Size of the data allocated by the caller */
 338         compat_uptr_t ifs_ifsu; /* union of pointers */
 339 };
 340
 341 struct compat_ifreq {
 342         union {
 343                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 344         } ifr_ifrn;
 345         union {
 346                 struct  sockaddr ifru_addr;
 347                 struct  sockaddr ifru_dstaddr;
 348                 struct  sockaddr ifru_broadaddr;
 349                 struct  sockaddr ifru_netmask;
 350                 struct  sockaddr ifru_hwaddr;
 351                 short   ifru_flags;
 352                 compat_int_t    ifru_ivalue;
 353                 compat_int_t    ifru_mtu;
 354                 struct  compat_ifmap ifru_map;
 355                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 356                 char    ifru_newname[IFNAMSIZ];
 357                 compat_caddr_t  ifru_data;
 358                 struct  compat_if_settings ifru_settings;
 359         } ifr_ifru;
 360 };
 361
 362 struct compat_ifconf {
 363         compat_int_t    ifc_len;                /* size of buffer */
 364         compat_caddr_t  ifcbuf;
 365 };
 366
 367 struct compat_robust_list {
 368         compat_uptr_t                   next;
 369 };
 370
 371 struct compat_robust_list_head {
 372         struct compat_robust_list       list;
 373         compat_long_t                   futex_offset;
 374         compat_uptr_t                   list_op_pending;
 375 };
 376
 377 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 378 struct compat_old_sigaction {
 379         compat_uptr_t                   sa_handler;
 380         compat_old_sigset_t             sa_mask;
 381         compat_ulong_t                  sa_flags;
 382         compat_uptr_t                   sa_restorer;
 383 };
 384 #endif
 385
 386 struct compat_keyctl_kdf_params {
 387         compat_uptr_t hashname;
 388         compat_uptr_t otherinfo;
 389         __u32 otherinfolen;
 390         __u32 __spare[8];
 391 };
 392
 393 struct compat_statfs;
 394 struct compat_statfs64;
 395 struct compat_old_linux_dirent;
 396 struct compat_linux_dirent;
 397 struct linux_dirent64;
 398 struct compat_msghdr;
 399 struct compat_mmsghdr;
 400 struct compat_sysinfo;
 401 struct compat_sysctl_args;
 402 struct compat_kexec_segment;
 403 struct compat_mq_attr;
 404 struct compat_msgbuf;
 405
 406 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 407
 408 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 409
 410 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 411                        unsigned long bitmap_size);
 412 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 413                        unsigned long bitmap_size);
 414 int copy_siginfo_from_user32(kernel_siginfo_t *to, const struct compat_siginfo __user *from);
 415 int copy_siginfo_to_user32(struct compat_siginfo __user *to, const kernel_siginfo_t *from);
 416 int get_compat_sigevent(struct sigevent *event,
 417                 const struct compat_sigevent __user *u_event);
 418
 419 static inline int old_timeval32_compare(struct old_timeval32 *lhs,
 420                                         struct old_timeval32 *rhs)
 421 {
 422         if (lhs->tv_sec < rhs->tv_sec)
 423                 return -1;
 424         if (lhs->tv_sec > rhs->tv_sec)
 425                 return 1;
 426         return lhs->tv_usec - rhs->tv_usec;
 427 }
 428
 429 static inline int old_timespec32_compare(struct old_timespec32 *lhs,
 430                                         struct old_timespec32 *rhs)
 431 {
 432         if (lhs->tv_sec < rhs->tv_sec)
 433                 return -1;
 434         if (lhs->tv_sec > rhs->tv_sec)
 435                 return 1;
 436         return lhs->tv_nsec - rhs->tv_nsec;
 437 }
 438
 439 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 440
 441 /*
 442  * Defined inline such that size can be compile time constant, which avoids
 443  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 444  */
 445 static inline int
 446 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 447                   unsigned int size)
 448 {
 449         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 450 #ifdef __BIG_ENDIAN
 451         compat_sigset_t v;
 452         switch (_NSIG_WORDS) {
 453         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 454                 /* fall through */
 455         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 456                 /* fall through */
 457         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 458                 /* fall through */
 459         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 460         }
 461         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 462 #else
 463         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 464 #endif
 465 }
 466
 467 extern int compat_ptrace_request(struct task_struct *child,
 468                                  compat_long_t request,
 469                                  compat_ulong_t addr, compat_ulong_t data);
 470
 471 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 472                                compat_ulong_t addr, compat_ulong_t data);
 473
 474 struct epoll_event;     /* fortunately, this one is fixed-layout */
 475
 476 extern ssize_t compat_rw_copy_check_uvector(int type,
 477                 const struct compat_iovec __user *uvector,
 478                 unsigned long nr_segs,
 479                 unsigned long fast_segs, struct iovec *fast_pointer,
 480                 struct iovec **ret_pointer);
 481
 482 extern void __user *compat_alloc_user_space(unsigned long len);
 483
 484 int compat_restore_altstack(const compat_stack_t __user *uss);
 485 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 486 #define compat_save_altstack_ex(uss, sp) do { \
 487         compat_stack_t __user *__uss = uss; \
 488         struct task_struct *t = current; \
 489         put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
 490         put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
 491         put_user_ex(t->sas_ss_size, &__uss->ss_size); \
 492         if (t->sas_ss_flags & SS_AUTODISARM) \
 493                 sas_ss_reset(t); \
 494 } while (0);
 495
 496 /*
 497  * These syscall function prototypes are kept in the same order as
 498  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 499  * go below.
 500  *
 501  * Please note that these prototypes here are only provided for information
 502  * purposes, for static analysis, and for linking from the syscall table.
 503  * These functions should not be called elsewhere from kernel code.
 504  *
 505  * As the syscall calling convention may be different from the default
 506  * for architectures overriding the syscall calling convention, do not
 507  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 508  */
 509 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 510 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 511 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 512                                      u32 __user *iocb);
 513 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 514                                         compat_long_t min_nr,
 515                                         compat_long_t nr,
 516                                         struct io_event __user *events,
 517                                         struct old_timespec32 __user *timeout,
 518                                         const struct __compat_aio_sigset __user *usig);
 519 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 520                                         compat_long_t min_nr,
 521                                         compat_long_t nr,
 522                                         struct io_event __user *events,
 523                                         struct __kernel_timespec __user *timeout,
 524                                         const struct __compat_aio_sigset __user *usig);
 525
 526 /* fs/cookies.c */
 527 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 528
 529 /* fs/eventpoll.c */
 530 asmlinkage long compat_sys_epoll_pwait(int epfd,
 531                         struct epoll_event __user *events,
 532                         int maxevents, int timeout,
 533                         const compat_sigset_t __user *sigmask,
 534                         compat_size_t sigsetsize);
 535
 536 /* fs/fcntl.c */
 537 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 538                                  compat_ulong_t arg);
 539 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 540                                    compat_ulong_t arg);
 541
 542 /* fs/ioctl.c */
 543 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 544                                  compat_ulong_t arg);
 545
 546 /* fs/namespace.c */
 547 asmlinkage long compat_sys_mount(const char __user *dev_name,
 548                                  const char __user *dir_name,
 549                                  const char __user *type, compat_ulong_t flags,
 550                                  const void __user *data);
 551
 552 /* fs/open.c */
 553 asmlinkage long compat_sys_statfs(const char __user *pathname,
 554                                   struct compat_statfs __user *buf);
 555 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 556                                     compat_size_t sz,
 557                                     struct compat_statfs64 __user *buf);
 558 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 559                                    struct compat_statfs __user *buf);
 560 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 561                                      struct compat_statfs64 __user *buf);
 562 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 563 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 564 /* No generic prototype for truncate64, ftruncate64, fallocate */
 565 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 566                                   int flags, umode_t mode);
 567
 568 /* fs/readdir.c */
 569 asmlinkage long compat_sys_getdents(unsigned int fd,
 570                                     struct compat_linux_dirent __user *dirent,
 571                                     unsigned int count);
 572
 573 /* fs/read_write.c */
 574 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 575 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 576                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 577 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 578                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 579 /* No generic prototype for pread64 and pwrite64 */
 580 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 581                 const struct compat_iovec __user *vec,
 582                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 583 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 584                 const struct compat_iovec __user *vec,
 585                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 586 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 587 asmlinkage long compat_sys_preadv64(unsigned long fd,
 588                 const struct compat_iovec __user *vec,
 589                 unsigned long vlen, loff_t pos);
 590 #endif
 591
 592 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 593 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 594                 const struct compat_iovec __user *vec,
 595                 unsigned long vlen, loff_t pos);
 596 #endif
 597
 598 /* fs/sendfile.c */
 599 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 600                                     compat_off_t __user *offset, compat_size_t count);
 601 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 602                                     compat_loff_t __user *offset, compat_size_t count);
 603
 604 /* fs/select.c */
 605 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 606                                     compat_ulong_t __user *outp,
 607                                     compat_ulong_t __user *exp,
 608                                     struct old_timespec32 __user *tsp,
 609                                     void __user *sig);
 610 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 611                                     compat_ulong_t __user *outp,
 612                                     compat_ulong_t __user *exp,
 613                                     struct __kernel_timespec __user *tsp,
 614                                     void __user *sig);
 615 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 616                                  unsigned int nfds,
 617                                  struct old_timespec32 __user *tsp,
 618                                  const compat_sigset_t __user *sigmask,
 619                                  compat_size_t sigsetsize);
 620 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 621                                  unsigned int nfds,
 622                                  struct __kernel_timespec __user *tsp,
 623                                  const compat_sigset_t __user *sigmask,
 624                                  compat_size_t sigsetsize);
 625
 626 /* fs/signalfd.c */
 627 asmlinkage long compat_sys_signalfd4(int ufd,
 628                                      const compat_sigset_t __user *sigmask,
 629                                      compat_size_t sigsetsize, int flags);
 630
 631 /* fs/splice.c */
 632 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 633                                     unsigned int nr_segs, unsigned int flags);
 634
 635 /* fs/stat.c */
 636 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 637                                       const char __user *filename,
 638                                       struct compat_stat __user *statbuf,
 639                                       int flag);
 640 asmlinkage long compat_sys_newfstat(unsigned int fd,
 641                                     struct compat_stat __user *statbuf);
 642
 643 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 644
 645 /* kernel/exit.c */
 646 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 647                 struct compat_siginfo __user *, int,
 648                 struct compat_rusage __user *);
 649
 650
 651
 652 /* kernel/futex.c */
 653 asmlinkage long
 654 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 655                            compat_size_t len);
 656 asmlinkage long
 657 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 658                            compat_size_t __user *len_ptr);
 659
 660 /* kernel/itimer.c */
 661 asmlinkage long compat_sys_getitimer(int which,
 662                                      struct old_itimerval32 __user *it);
 663 asmlinkage long compat_sys_setitimer(int which,
 664                                      struct old_itimerval32 __user *in,
 665                                      struct old_itimerval32 __user *out);
 666
 667 /* kernel/kexec.c */
 668 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 669                                       compat_ulong_t nr_segments,
 670                                       struct compat_kexec_segment __user *,
 671                                       compat_ulong_t flags);
 672
 673 /* kernel/posix-timers.c */
 674 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 675                         struct compat_sigevent __user *timer_event_spec,
 676                         timer_t __user *created_timer_id);
 677
 678 /* kernel/ptrace.c */
 679 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 680                                   compat_long_t addr, compat_long_t data);
 681
 682 /* kernel/sched/core.c */
 683 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 684                                      unsigned int len,
 685                                      compat_ulong_t __user *user_mask_ptr);
 686 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 687                                      unsigned int len,
 688                                      compat_ulong_t __user *user_mask_ptr);
 689
 690 /* kernel/signal.c */
 691 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 692                                        compat_stack_t __user *uoss_ptr);
 693 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 694                                          compat_size_t sigsetsize);
 695 #ifndef CONFIG_ODD_RT_SIGACTION
 696 asmlinkage long compat_sys_rt_sigaction(int,
 697                                  const struct compat_sigaction __user *,
 698                                  struct compat_sigaction __user *,
 699                                  compat_size_t);
 700 #endif
 701 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 702                                           compat_sigset_t __user *oset,
 703                                           compat_size_t sigsetsize);
 704 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 705                                          compat_size_t sigsetsize);
 706 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 707                 struct compat_siginfo __user *uinfo,
 708                 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 709 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 710                 struct compat_siginfo __user *uinfo,
 711                 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 712 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 713                                 struct compat_siginfo __user *uinfo);
 714 /* No generic prototype for rt_sigreturn */
 715
 716 /* kernel/sys.c */
 717 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 718 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 719                                      struct compat_rlimit __user *rlim);
 720 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 721                                      struct compat_rlimit __user *rlim);
 722 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 723
 724 /* kernel/time.c */
 725 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 726                 struct timezone __user *tz);
 727 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 728                 struct timezone __user *tz);
 729
 730 /* kernel/timer.c */
 731 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 732
 733 /* ipc/mqueue.c */
 734 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 735                         int oflag, compat_mode_t mode,
 736                         struct compat_mq_attr __user *u_attr);
 737 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 738                         const struct compat_sigevent __user *u_notification);
 739 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 740                         const struct compat_mq_attr __user *u_mqstat,
 741                         struct compat_mq_attr __user *u_omqstat);
 742
 743 /* ipc/msg.c */
 744 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 745 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 746                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 747 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 748                 compat_ssize_t msgsz, int msgflg);
 749
 750 /* ipc/sem.c */
 751 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 752
 753 /* ipc/shm.c */
 754 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 755 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 756
 757 /* net/socket.c */
 758 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 759                             unsigned flags, struct sockaddr __user *addr,
 760                             int __user *addrlen);
 761 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 762                                       char __user *optval, unsigned int optlen);
 763 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 764                                       char __user *optval, int __user *optlen);
 765 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 766                                    unsigned flags);
 767 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 768                                    unsigned int flags);
 769
 770 /* mm/filemap.c: No generic prototype for readahead */
 771
 772 /* security/keys/keyctl.c */
 773 asmlinkage long compat_sys_keyctl(u32 option,
 774                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 775
 776 /* arch/example/kernel/sys_example.c */
 777 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 778                      const compat_uptr_t __user *envp);
 779
 780 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 781
 782 /* mm/, CONFIG_MMU only */
 783 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 784                                  compat_ulong_t mode,
 785                                  compat_ulong_t __user *nmask,
 786                                  compat_ulong_t maxnode, compat_ulong_t flags);
 787 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 788                                          compat_ulong_t __user *nmask,
 789                                          compat_ulong_t maxnode,
 790                                          compat_ulong_t addr,
 791                                          compat_ulong_t flags);
 792 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 793                                          compat_ulong_t maxnode);
 794 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 795                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 796                 const compat_ulong_t __user *new_nodes);
 797 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 798                                       __u32 __user *pages,
 799                                       const int __user *nodes,
 800                                       int __user *status,
 801                                       int flags);
 802
 803 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 804                                         compat_pid_t pid, int sig,
 805                                         struct compat_siginfo __user *uinfo);
 806 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 807                                     unsigned vlen, unsigned int flags,
 808                                     struct __kernel_timespec __user *timeout);
 809 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 810                                     unsigned vlen, unsigned int flags,
 811                                     struct old_timespec32 __user *timeout);
 812 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 813                                  compat_uint_t __user *stat_addr, int options,
 814                                  struct compat_rusage __user *ru);
 815 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 816                                             int, const char __user *);
 817 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 818                                              struct file_handle __user *handle,
 819                                              int flags);
 820 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 821                                     unsigned vlen, unsigned int flags);
 822 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 823                 const struct compat_iovec __user *lvec,
 824                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 825                 compat_ulong_t riovcnt, compat_ulong_t flags);
 826 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 827                 const struct compat_iovec __user *lvec,
 828                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 829                 compat_ulong_t riovcnt, compat_ulong_t flags);
 830 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 831                      const compat_uptr_t __user *argv,
 832                      const compat_uptr_t __user *envp, int flags);
 833 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 834                 const struct compat_iovec __user *vec,
 835                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 836 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 837                 const struct compat_iovec __user *vec,
 838                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 839 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 840 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 841                 const struct compat_iovec __user *vec,
 842                 unsigned long vlen, loff_t pos, rwf_t flags);
 843 #endif
 844
 845 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 846 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 847                 const struct compat_iovec __user *vec,
 848                 unsigned long vlen, loff_t pos, rwf_t flags);
 849 #endif
 850
 851
 852 /*
 853  * Deprecated system calls which are still defined in
 854  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 855  */
 856
 857 /* __ARCH_WANT_SYSCALL_NO_AT */
 858 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 859                                 umode_t mode);
 860
 861 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 862 asmlinkage long compat_sys_signalfd(int ufd,
 863                                     const compat_sigset_t __user *sigmask,
 864                                     compat_size_t sigsetsize);
 865
 866 /* __ARCH_WANT_SYSCALL_OFF_T */
 867 asmlinkage long compat_sys_newstat(const char __user *filename,
 868                                    struct compat_stat __user *statbuf);
 869 asmlinkage long compat_sys_newlstat(const char __user *filename,
 870                                     struct compat_stat __user *statbuf);
 871
 872 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 873 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 874                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 875                 struct old_timeval32 __user *tvp);
 876 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 877 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 878                                 unsigned flags);
 879 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
 880
 881 /* obsolete: fs/readdir.c */
 882 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 883                                        struct compat_old_linux_dirent __user *,
 884                                        unsigned int count);
 885
 886 /* obsolete: fs/select.c */
 887 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 888
 889 /* obsolete: ipc */
 890 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 891
 892 /* obsolete: kernel/signal.c */
 893 #ifdef __ARCH_WANT_SYS_SIGPENDING
 894 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 895 #endif
 896
 897 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 898 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 899                                        compat_old_sigset_t __user *oset);
 900 #endif
 901 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 902 asmlinkage long compat_sys_sigaction(int sig,
 903                                    const struct compat_old_sigaction __user *act,
 904                                    struct compat_old_sigaction __user *oact);
 905 #endif
 906
 907 /* obsolete: net/socket.c */
 908 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 909
 910 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 911
 912
 913 /*
 914  * For most but not all architectures, "am I in a compat syscall?" and
 915  * "am I a compat task?" are the same question.  For architectures on which
 916  * they aren't the same question, arch code can override in_compat_syscall.
 917  */
 918
 919 #ifndef in_compat_syscall
 920 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 921 #endif
 922
 923 /**
 924  * ns_to_old_timeval32 - Compat version of ns_to_timeval
 925  * @nsec:       the nanoseconds value to be converted
 926  *
 927  * Returns the old_timeval32 representation of the nsec parameter.
 928  */
 929 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
 930 {
 931         struct __kernel_old_timeval tv;
 932         struct old_timeval32 ctv;
 933
 934         tv = ns_to_kernel_old_timeval(nsec);
 935         ctv.tv_sec = tv.tv_sec;
 936         ctv.tv_usec = tv.tv_usec;
 937
 938         return ctv;
 939 }
 940
 941 /*
 942  * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 943  * directly.  Instead, use one of the functions which work equivalently, such
 944  * as the kcompat_sys_xyzyyz() functions prototyped below.
 945  */
 946
 947 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 948                      struct compat_statfs64 __user * buf);
 949 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 950                           struct compat_statfs64 __user * buf);
 951
 952 #else /* !CONFIG_COMPAT */
 953
 954 #define is_compat_task() (0)
 955 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
 956 #define in_compat_syscall in_compat_syscall
 957 static inline bool in_compat_syscall(void) { return false; }
 958
 959 #endif /* CONFIG_COMPAT */
 960
 961 #endif /* _LINUX_COMPAT_H */