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 compat_itimerval {
 120         struct old_timeval32    it_interval;
 121         struct old_timeval32    it_value;
 122 };
 123
 124 struct itimerval;
 125 int get_compat_itimerval(struct itimerval *, const struct compat_itimerval __user *);
 126 int put_compat_itimerval(struct compat_itimerval __user *, const struct itimerval *);
 127
 128 struct compat_tms {
 129         compat_clock_t          tms_utime;
 130         compat_clock_t          tms_stime;
 131         compat_clock_t          tms_cutime;
 132         compat_clock_t          tms_cstime;
 133 };
 134
 135 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 136
 137 typedef struct {
 138         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 139 } compat_sigset_t;
 140
 141 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
 142                             size_t sigsetsize);
 143
 144 struct compat_sigaction {
 145 #ifndef __ARCH_HAS_IRIX_SIGACTION
 146         compat_uptr_t                   sa_handler;
 147         compat_ulong_t                  sa_flags;
 148 #else
 149         compat_uint_t                   sa_flags;
 150         compat_uptr_t                   sa_handler;
 151 #endif
 152 #ifdef __ARCH_HAS_SA_RESTORER
 153         compat_uptr_t                   sa_restorer;
 154 #endif
 155         compat_sigset_t                 sa_mask __packed;
 156 };
 157
 158 typedef union compat_sigval {
 159         compat_int_t    sival_int;
 160         compat_uptr_t   sival_ptr;
 161 } compat_sigval_t;
 162
 163 typedef struct compat_siginfo {
 164         int si_signo;
 165 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
 166         int si_errno;
 167         int si_code;
 168 #else
 169         int si_code;
 170         int si_errno;
 171 #endif
 172
 173         union {
 174                 int _pad[128/sizeof(int) - 3];
 175
 176                 /* kill() */
 177                 struct {
 178                         compat_pid_t _pid;      /* sender's pid */
 179                         __compat_uid32_t _uid;  /* sender's uid */
 180                 } _kill;
 181
 182                 /* POSIX.1b timers */
 183                 struct {
 184                         compat_timer_t _tid;    /* timer id */
 185                         int _overrun;           /* overrun count */
 186                         compat_sigval_t _sigval;        /* same as below */
 187                 } _timer;
 188
 189                 /* POSIX.1b signals */
 190                 struct {
 191                         compat_pid_t _pid;      /* sender's pid */
 192                         __compat_uid32_t _uid;  /* sender's uid */
 193                         compat_sigval_t _sigval;
 194                 } _rt;
 195
 196                 /* SIGCHLD */
 197                 struct {
 198                         compat_pid_t _pid;      /* which child */
 199                         __compat_uid32_t _uid;  /* sender's uid */
 200                         int _status;            /* exit code */
 201                         compat_clock_t _utime;
 202                         compat_clock_t _stime;
 203                 } _sigchld;
 204
 205 #ifdef CONFIG_X86_X32_ABI
 206                 /* SIGCHLD (x32 version) */
 207                 struct {
 208                         compat_pid_t _pid;      /* which child */
 209                         __compat_uid32_t _uid;  /* sender's uid */
 210                         int _status;            /* exit code */
 211                         compat_s64 _utime;
 212                         compat_s64 _stime;
 213                 } _sigchld_x32;
 214 #endif
 215
 216                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 217                 struct {
 218                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
 219 #ifdef __ARCH_SI_TRAPNO
 220                         int _trapno;    /* TRAP # which caused the signal */
 221 #endif
 222 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 223                                      sizeof(short) : __alignof__(compat_uptr_t))
 224                         union {
 225                                 /*
 226                                  * used when si_code=BUS_MCEERR_AR or
 227                                  * used when si_code=BUS_MCEERR_AO
 228                                  */
 229                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
 230                                 /* used when si_code=SEGV_BNDERR */
 231                                 struct {
 232                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
 233                                         compat_uptr_t _lower;
 234                                         compat_uptr_t _upper;
 235                                 } _addr_bnd;
 236                                 /* used when si_code=SEGV_PKUERR */
 237                                 struct {
 238                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
 239                                         u32 _pkey;
 240                                 } _addr_pkey;
 241                         };
 242                 } _sigfault;
 243
 244                 /* SIGPOLL */
 245                 struct {
 246                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 247                         int _fd;
 248                 } _sigpoll;
 249
 250                 struct {
 251                         compat_uptr_t _call_addr; /* calling user insn */
 252                         int _syscall;   /* triggering system call number */
 253                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 254                 } _sigsys;
 255         } _sifields;
 256 } compat_siginfo_t;
 257
 258 /*
 259  * These functions operate on 32- or 64-bit specs depending on
 260  * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments.
 261  */
 262 extern int compat_get_timespec(struct timespec *, const void __user *);
 263 extern int compat_put_timespec(const struct timespec *, void __user *);
 264 extern int compat_get_timeval(struct timeval *, const void __user *);
 265 extern int compat_put_timeval(const struct timeval *, void __user *);
 266
 267 struct compat_iovec {
 268         compat_uptr_t   iov_base;
 269         compat_size_t   iov_len;
 270 };
 271
 272 struct compat_rlimit {
 273         compat_ulong_t  rlim_cur;
 274         compat_ulong_t  rlim_max;
 275 };
 276
 277 struct compat_rusage {
 278         struct old_timeval32 ru_utime;
 279         struct old_timeval32 ru_stime;
 280         compat_long_t   ru_maxrss;
 281         compat_long_t   ru_ixrss;
 282         compat_long_t   ru_idrss;
 283         compat_long_t   ru_isrss;
 284         compat_long_t   ru_minflt;
 285         compat_long_t   ru_majflt;
 286         compat_long_t   ru_nswap;
 287         compat_long_t   ru_inblock;
 288         compat_long_t   ru_oublock;
 289         compat_long_t   ru_msgsnd;
 290         compat_long_t   ru_msgrcv;
 291         compat_long_t   ru_nsignals;
 292         compat_long_t   ru_nvcsw;
 293         compat_long_t   ru_nivcsw;
 294 };
 295
 296 extern int put_compat_rusage(const struct rusage *,
 297                              struct compat_rusage __user *);
 298
 299 struct compat_siginfo;
 300 struct __compat_aio_sigset;
 301
 302 struct compat_dirent {
 303         u32             d_ino;
 304         compat_off_t    d_off;
 305         u16             d_reclen;
 306         char            d_name[256];
 307 };
 308
 309 struct compat_ustat {
 310         compat_daddr_t          f_tfree;
 311         compat_ino_t            f_tinode;
 312         char                    f_fname[6];
 313         char                    f_fpack[6];
 314 };
 315
 316 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 317
 318 typedef struct compat_sigevent {
 319         compat_sigval_t sigev_value;
 320         compat_int_t sigev_signo;
 321         compat_int_t sigev_notify;
 322         union {
 323                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 324                 compat_int_t _tid;
 325
 326                 struct {
 327                         compat_uptr_t _function;
 328                         compat_uptr_t _attribute;
 329                 } _sigev_thread;
 330         } _sigev_un;
 331 } compat_sigevent_t;
 332
 333 struct compat_ifmap {
 334         compat_ulong_t mem_start;
 335         compat_ulong_t mem_end;
 336         unsigned short base_addr;
 337         unsigned char irq;
 338         unsigned char dma;
 339         unsigned char port;
 340 };
 341
 342 struct compat_if_settings {
 343         unsigned int type;      /* Type of physical device or protocol */
 344         unsigned int size;      /* Size of the data allocated by the caller */
 345         compat_uptr_t ifs_ifsu; /* union of pointers */
 346 };
 347
 348 struct compat_ifreq {
 349         union {
 350                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 351         } ifr_ifrn;
 352         union {
 353                 struct  sockaddr ifru_addr;
 354                 struct  sockaddr ifru_dstaddr;
 355                 struct  sockaddr ifru_broadaddr;
 356                 struct  sockaddr ifru_netmask;
 357                 struct  sockaddr ifru_hwaddr;
 358                 short   ifru_flags;
 359                 compat_int_t    ifru_ivalue;
 360                 compat_int_t    ifru_mtu;
 361                 struct  compat_ifmap ifru_map;
 362                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 363                 char    ifru_newname[IFNAMSIZ];
 364                 compat_caddr_t  ifru_data;
 365                 struct  compat_if_settings ifru_settings;
 366         } ifr_ifru;
 367 };
 368
 369 struct compat_ifconf {
 370         compat_int_t    ifc_len;                /* size of buffer */
 371         compat_caddr_t  ifcbuf;
 372 };
 373
 374 struct compat_robust_list {
 375         compat_uptr_t                   next;
 376 };
 377
 378 struct compat_robust_list_head {
 379         struct compat_robust_list       list;
 380         compat_long_t                   futex_offset;
 381         compat_uptr_t                   list_op_pending;
 382 };
 383
 384 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 385 struct compat_old_sigaction {
 386         compat_uptr_t                   sa_handler;
 387         compat_old_sigset_t             sa_mask;
 388         compat_ulong_t                  sa_flags;
 389         compat_uptr_t                   sa_restorer;
 390 };
 391 #endif
 392
 393 struct compat_keyctl_kdf_params {
 394         compat_uptr_t hashname;
 395         compat_uptr_t otherinfo;
 396         __u32 otherinfolen;
 397         __u32 __spare[8];
 398 };
 399
 400 struct compat_statfs;
 401 struct compat_statfs64;
 402 struct compat_old_linux_dirent;
 403 struct compat_linux_dirent;
 404 struct linux_dirent64;
 405 struct compat_msghdr;
 406 struct compat_mmsghdr;
 407 struct compat_sysinfo;
 408 struct compat_sysctl_args;
 409 struct compat_kexec_segment;
 410 struct compat_mq_attr;
 411 struct compat_msgbuf;
 412
 413 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 414
 415 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 416
 417 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 418                        unsigned long bitmap_size);
 419 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 420                        unsigned long bitmap_size);
 421 int copy_siginfo_from_user32(kernel_siginfo_t *to, const struct compat_siginfo __user *from);
 422 int copy_siginfo_to_user32(struct compat_siginfo __user *to, const kernel_siginfo_t *from);
 423 int get_compat_sigevent(struct sigevent *event,
 424                 const struct compat_sigevent __user *u_event);
 425
 426 static inline int old_timeval32_compare(struct old_timeval32 *lhs,
 427                                         struct old_timeval32 *rhs)
 428 {
 429         if (lhs->tv_sec < rhs->tv_sec)
 430                 return -1;
 431         if (lhs->tv_sec > rhs->tv_sec)
 432                 return 1;
 433         return lhs->tv_usec - rhs->tv_usec;
 434 }
 435
 436 static inline int old_timespec32_compare(struct old_timespec32 *lhs,
 437                                         struct old_timespec32 *rhs)
 438 {
 439         if (lhs->tv_sec < rhs->tv_sec)
 440                 return -1;
 441         if (lhs->tv_sec > rhs->tv_sec)
 442                 return 1;
 443         return lhs->tv_nsec - rhs->tv_nsec;
 444 }
 445
 446 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 447
 448 /*
 449  * Defined inline such that size can be compile time constant, which avoids
 450  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 451  */
 452 static inline int
 453 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 454                   unsigned int size)
 455 {
 456         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 457 #ifdef __BIG_ENDIAN
 458         compat_sigset_t v;
 459         switch (_NSIG_WORDS) {
 460         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 461                 /* fall through */
 462         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 463                 /* fall through */
 464         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 465                 /* fall through */
 466         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 467         }
 468         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 469 #else
 470         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 471 #endif
 472 }
 473
 474 extern int compat_ptrace_request(struct task_struct *child,
 475                                  compat_long_t request,
 476                                  compat_ulong_t addr, compat_ulong_t data);
 477
 478 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 479                                compat_ulong_t addr, compat_ulong_t data);
 480
 481 struct epoll_event;     /* fortunately, this one is fixed-layout */
 482
 483 extern ssize_t compat_rw_copy_check_uvector(int type,
 484                 const struct compat_iovec __user *uvector,
 485                 unsigned long nr_segs,
 486                 unsigned long fast_segs, struct iovec *fast_pointer,
 487                 struct iovec **ret_pointer);
 488
 489 extern void __user *compat_alloc_user_space(unsigned long len);
 490
 491 int compat_restore_altstack(const compat_stack_t __user *uss);
 492 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 493 #define compat_save_altstack_ex(uss, sp) do { \
 494         compat_stack_t __user *__uss = uss; \
 495         struct task_struct *t = current; \
 496         put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
 497         put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
 498         put_user_ex(t->sas_ss_size, &__uss->ss_size); \
 499         if (t->sas_ss_flags & SS_AUTODISARM) \
 500                 sas_ss_reset(t); \
 501 } while (0);
 502
 503 /*
 504  * These syscall function prototypes are kept in the same order as
 505  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 506  * go below.
 507  *
 508  * Please note that these prototypes here are only provided for information
 509  * purposes, for static analysis, and for linking from the syscall table.
 510  * These functions should not be called elsewhere from kernel code.
 511  *
 512  * As the syscall calling convention may be different from the default
 513  * for architectures overriding the syscall calling convention, do not
 514  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 515  */
 516 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 517 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 518 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 519                                      u32 __user *iocb);
 520 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 521                                         compat_long_t min_nr,
 522                                         compat_long_t nr,
 523                                         struct io_event __user *events,
 524                                         struct old_timespec32 __user *timeout,
 525                                         const struct __compat_aio_sigset __user *usig);
 526 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 527                                         compat_long_t min_nr,
 528                                         compat_long_t nr,
 529                                         struct io_event __user *events,
 530                                         struct __kernel_timespec __user *timeout,
 531                                         const struct __compat_aio_sigset __user *usig);
 532
 533 /* fs/cookies.c */
 534 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 535
 536 /* fs/eventpoll.c */
 537 asmlinkage long compat_sys_epoll_pwait(int epfd,
 538                         struct epoll_event __user *events,
 539                         int maxevents, int timeout,
 540                         const compat_sigset_t __user *sigmask,
 541                         compat_size_t sigsetsize);
 542
 543 /* fs/fcntl.c */
 544 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 545                                  compat_ulong_t arg);
 546 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 547                                    compat_ulong_t arg);
 548
 549 /* fs/ioctl.c */
 550 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 551                                  compat_ulong_t arg);
 552
 553 /* fs/namespace.c */
 554 asmlinkage long compat_sys_mount(const char __user *dev_name,
 555                                  const char __user *dir_name,
 556                                  const char __user *type, compat_ulong_t flags,
 557                                  const void __user *data);
 558
 559 /* fs/open.c */
 560 asmlinkage long compat_sys_statfs(const char __user *pathname,
 561                                   struct compat_statfs __user *buf);
 562 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 563                                     compat_size_t sz,
 564                                     struct compat_statfs64 __user *buf);
 565 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 566                                    struct compat_statfs __user *buf);
 567 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 568                                      struct compat_statfs64 __user *buf);
 569 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 570 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 571 /* No generic prototype for truncate64, ftruncate64, fallocate */
 572 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 573                                   int flags, umode_t mode);
 574
 575 /* fs/readdir.c */
 576 asmlinkage long compat_sys_getdents(unsigned int fd,
 577                                     struct compat_linux_dirent __user *dirent,
 578                                     unsigned int count);
 579
 580 /* fs/read_write.c */
 581 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 582 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 583                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 584 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 585                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 586 /* No generic prototype for pread64 and pwrite64 */
 587 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 588                 const struct compat_iovec __user *vec,
 589                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 590 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 591                 const struct compat_iovec __user *vec,
 592                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 593 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 594 asmlinkage long compat_sys_preadv64(unsigned long fd,
 595                 const struct compat_iovec __user *vec,
 596                 unsigned long vlen, loff_t pos);
 597 #endif
 598
 599 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 600 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 601                 const struct compat_iovec __user *vec,
 602                 unsigned long vlen, loff_t pos);
 603 #endif
 604
 605 /* fs/sendfile.c */
 606 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 607                                     compat_off_t __user *offset, compat_size_t count);
 608 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 609                                     compat_loff_t __user *offset, compat_size_t count);
 610
 611 /* fs/select.c */
 612 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 613                                     compat_ulong_t __user *outp,
 614                                     compat_ulong_t __user *exp,
 615                                     struct old_timespec32 __user *tsp,
 616                                     void __user *sig);
 617 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 618                                     compat_ulong_t __user *outp,
 619                                     compat_ulong_t __user *exp,
 620                                     struct __kernel_timespec __user *tsp,
 621                                     void __user *sig);
 622 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 623                                  unsigned int nfds,
 624                                  struct old_timespec32 __user *tsp,
 625                                  const compat_sigset_t __user *sigmask,
 626                                  compat_size_t sigsetsize);
 627 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 628                                  unsigned int nfds,
 629                                  struct __kernel_timespec __user *tsp,
 630                                  const compat_sigset_t __user *sigmask,
 631                                  compat_size_t sigsetsize);
 632
 633 /* fs/signalfd.c */
 634 asmlinkage long compat_sys_signalfd4(int ufd,
 635                                      const compat_sigset_t __user *sigmask,
 636                                      compat_size_t sigsetsize, int flags);
 637
 638 /* fs/splice.c */
 639 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 640                                     unsigned int nr_segs, unsigned int flags);
 641
 642 /* fs/stat.c */
 643 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 644                                       const char __user *filename,
 645                                       struct compat_stat __user *statbuf,
 646                                       int flag);
 647 asmlinkage long compat_sys_newfstat(unsigned int fd,
 648                                     struct compat_stat __user *statbuf);
 649
 650 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 651
 652 /* kernel/exit.c */
 653 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 654                 struct compat_siginfo __user *, int,
 655                 struct compat_rusage __user *);
 656
 657
 658
 659 /* kernel/futex.c */
 660 asmlinkage long
 661 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 662                            compat_size_t len);
 663 asmlinkage long
 664 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 665                            compat_size_t __user *len_ptr);
 666
 667 /* kernel/itimer.c */
 668 asmlinkage long compat_sys_getitimer(int which,
 669                                      struct compat_itimerval __user *it);
 670 asmlinkage long compat_sys_setitimer(int which,
 671                                      struct compat_itimerval __user *in,
 672                                      struct compat_itimerval __user *out);
 673
 674 /* kernel/kexec.c */
 675 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 676                                       compat_ulong_t nr_segments,
 677                                       struct compat_kexec_segment __user *,
 678                                       compat_ulong_t flags);
 679
 680 /* kernel/posix-timers.c */
 681 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 682                         struct compat_sigevent __user *timer_event_spec,
 683                         timer_t __user *created_timer_id);
 684
 685 /* kernel/ptrace.c */
 686 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 687                                   compat_long_t addr, compat_long_t data);
 688
 689 /* kernel/sched/core.c */
 690 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 691                                      unsigned int len,
 692                                      compat_ulong_t __user *user_mask_ptr);
 693 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 694                                      unsigned int len,
 695                                      compat_ulong_t __user *user_mask_ptr);
 696
 697 /* kernel/signal.c */
 698 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 699                                        compat_stack_t __user *uoss_ptr);
 700 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 701                                          compat_size_t sigsetsize);
 702 #ifndef CONFIG_ODD_RT_SIGACTION
 703 asmlinkage long compat_sys_rt_sigaction(int,
 704                                  const struct compat_sigaction __user *,
 705                                  struct compat_sigaction __user *,
 706                                  compat_size_t);
 707 #endif
 708 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 709                                           compat_sigset_t __user *oset,
 710                                           compat_size_t sigsetsize);
 711 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 712                                          compat_size_t sigsetsize);
 713 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 714                 struct compat_siginfo __user *uinfo,
 715                 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 716 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 717                 struct compat_siginfo __user *uinfo,
 718                 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 719 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 720                                 struct compat_siginfo __user *uinfo);
 721 /* No generic prototype for rt_sigreturn */
 722
 723 /* kernel/sys.c */
 724 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 725 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 726                                      struct compat_rlimit __user *rlim);
 727 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 728                                      struct compat_rlimit __user *rlim);
 729 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 730
 731 /* kernel/time.c */
 732 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 733                 struct timezone __user *tz);
 734 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 735                 struct timezone __user *tz);
 736
 737 /* kernel/timer.c */
 738 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 739
 740 /* ipc/mqueue.c */
 741 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 742                         int oflag, compat_mode_t mode,
 743                         struct compat_mq_attr __user *u_attr);
 744 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 745                         const struct compat_sigevent __user *u_notification);
 746 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 747                         const struct compat_mq_attr __user *u_mqstat,
 748                         struct compat_mq_attr __user *u_omqstat);
 749
 750 /* ipc/msg.c */
 751 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 752 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 753                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 754 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 755                 compat_ssize_t msgsz, int msgflg);
 756
 757 /* ipc/sem.c */
 758 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 759
 760 /* ipc/shm.c */
 761 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 762 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 763
 764 /* net/socket.c */
 765 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 766                             unsigned flags, struct sockaddr __user *addr,
 767                             int __user *addrlen);
 768 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 769                                       char __user *optval, unsigned int optlen);
 770 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 771                                       char __user *optval, int __user *optlen);
 772 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 773                                    unsigned flags);
 774 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 775                                    unsigned int flags);
 776
 777 /* mm/filemap.c: No generic prototype for readahead */
 778
 779 /* security/keys/keyctl.c */
 780 asmlinkage long compat_sys_keyctl(u32 option,
 781                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 782
 783 /* arch/example/kernel/sys_example.c */
 784 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 785                      const compat_uptr_t __user *envp);
 786
 787 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 788
 789 /* mm/, CONFIG_MMU only */
 790 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 791                                  compat_ulong_t mode,
 792                                  compat_ulong_t __user *nmask,
 793                                  compat_ulong_t maxnode, compat_ulong_t flags);
 794 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 795                                          compat_ulong_t __user *nmask,
 796                                          compat_ulong_t maxnode,
 797                                          compat_ulong_t addr,
 798                                          compat_ulong_t flags);
 799 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 800                                          compat_ulong_t maxnode);
 801 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 802                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 803                 const compat_ulong_t __user *new_nodes);
 804 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 805                                       __u32 __user *pages,
 806                                       const int __user *nodes,
 807                                       int __user *status,
 808                                       int flags);
 809
 810 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 811                                         compat_pid_t pid, int sig,
 812                                         struct compat_siginfo __user *uinfo);
 813 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 814                                     unsigned vlen, unsigned int flags,
 815                                     struct __kernel_timespec __user *timeout);
 816 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 817                                     unsigned vlen, unsigned int flags,
 818                                     struct old_timespec32 __user *timeout);
 819 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 820                                  compat_uint_t __user *stat_addr, int options,
 821                                  struct compat_rusage __user *ru);
 822 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 823                                             int, const char __user *);
 824 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 825                                              struct file_handle __user *handle,
 826                                              int flags);
 827 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 828                                     unsigned vlen, unsigned int flags);
 829 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 830                 const struct compat_iovec __user *lvec,
 831                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 832                 compat_ulong_t riovcnt, compat_ulong_t flags);
 833 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 834                 const struct compat_iovec __user *lvec,
 835                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 836                 compat_ulong_t riovcnt, compat_ulong_t flags);
 837 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 838                      const compat_uptr_t __user *argv,
 839                      const compat_uptr_t __user *envp, int flags);
 840 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 841                 const struct compat_iovec __user *vec,
 842                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 843 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 844                 const struct compat_iovec __user *vec,
 845                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 846 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 847 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 848                 const struct compat_iovec __user *vec,
 849                 unsigned long vlen, loff_t pos, rwf_t flags);
 850 #endif
 851
 852 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 853 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 854                 const struct compat_iovec __user *vec,
 855                 unsigned long vlen, loff_t pos, rwf_t flags);
 856 #endif
 857
 858
 859 /*
 860  * Deprecated system calls which are still defined in
 861  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 862  */
 863
 864 /* __ARCH_WANT_SYSCALL_NO_AT */
 865 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 866                                 umode_t mode);
 867
 868 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 869 asmlinkage long compat_sys_signalfd(int ufd,
 870                                     const compat_sigset_t __user *sigmask,
 871                                     compat_size_t sigsetsize);
 872
 873 /* __ARCH_WANT_SYSCALL_OFF_T */
 874 asmlinkage long compat_sys_newstat(const char __user *filename,
 875                                    struct compat_stat __user *statbuf);
 876 asmlinkage long compat_sys_newlstat(const char __user *filename,
 877                                     struct compat_stat __user *statbuf);
 878
 879 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 880 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 881                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 882                 struct old_timeval32 __user *tvp);
 883 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 884 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 885                                 unsigned flags);
 886 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
 887
 888 /* obsolete: fs/readdir.c */
 889 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 890                                        struct compat_old_linux_dirent __user *,
 891                                        unsigned int count);
 892
 893 /* obsolete: fs/select.c */
 894 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 895
 896 /* obsolete: ipc */
 897 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 898
 899 /* obsolete: kernel/signal.c */
 900 #ifdef __ARCH_WANT_SYS_SIGPENDING
 901 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 902 #endif
 903
 904 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 905 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 906                                        compat_old_sigset_t __user *oset);
 907 #endif
 908 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 909 asmlinkage long compat_sys_sigaction(int sig,
 910                                    const struct compat_old_sigaction __user *act,
 911                                    struct compat_old_sigaction __user *oact);
 912 #endif
 913
 914 /* obsolete: net/socket.c */
 915 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 916
 917 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 918
 919
 920 /*
 921  * For most but not all architectures, "am I in a compat syscall?" and
 922  * "am I a compat task?" are the same question.  For architectures on which
 923  * they aren't the same question, arch code can override in_compat_syscall.
 924  */
 925
 926 #ifndef in_compat_syscall
 927 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 928 #endif
 929
 930 /**
 931  * ns_to_old_timeval32 - Compat version of ns_to_timeval
 932  * @nsec:       the nanoseconds value to be converted
 933  *
 934  * Returns the old_timeval32 representation of the nsec parameter.
 935  */
 936 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
 937 {
 938         struct timeval tv;
 939         struct old_timeval32 ctv;
 940
 941         tv = ns_to_timeval(nsec);
 942         ctv.tv_sec = tv.tv_sec;
 943         ctv.tv_usec = tv.tv_usec;
 944
 945         return ctv;
 946 }
 947
 948 /*
 949  * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 950  * directly.  Instead, use one of the functions which work equivalently, such
 951  * as the kcompat_sys_xyzyyz() functions prototyped below.
 952  */
 953
 954 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 955                      struct compat_statfs64 __user * buf);
 956 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 957                           struct compat_statfs64 __user * buf);
 958
 959 #else /* !CONFIG_COMPAT */
 960
 961 #define is_compat_task() (0)
 962 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
 963 #define in_compat_syscall in_compat_syscall
 964 static inline bool in_compat_syscall(void) { return false; }
 965
 966 #endif /* CONFIG_COMPAT */
 967
 968 #endif /* _LINUX_COMPAT_H */