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/compat_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
 107 #define compat_jiffies_to_clock_t(x)    \
 108                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
 109
 110 typedef __compat_uid32_t        compat_uid_t;
 111 typedef __compat_gid32_t        compat_gid_t;
 112
 113 typedef compat_ulong_t          compat_aio_context_t;
 114
 115 struct compat_sel_arg_struct;
 116 struct rusage;
 117
 118 struct compat_utimbuf {
 119         compat_time_t           actime;
 120         compat_time_t           modtime;
 121 };
 122
 123 struct compat_itimerval {
 124         struct compat_timeval   it_interval;
 125         struct compat_timeval   it_value;
 126 };
 127
 128 struct itimerval;
 129 int get_compat_itimerval(struct itimerval *, const struct compat_itimerval __user *);
 130 int put_compat_itimerval(struct compat_itimerval __user *, const struct itimerval *);
 131
 132 struct compat_tms {
 133         compat_clock_t          tms_utime;
 134         compat_clock_t          tms_stime;
 135         compat_clock_t          tms_cutime;
 136         compat_clock_t          tms_cstime;
 137 };
 138
 139 struct compat_timex {
 140         compat_uint_t modes;
 141         compat_long_t offset;
 142         compat_long_t freq;
 143         compat_long_t maxerror;
 144         compat_long_t esterror;
 145         compat_int_t status;
 146         compat_long_t constant;
 147         compat_long_t precision;
 148         compat_long_t tolerance;
 149         struct compat_timeval time;
 150         compat_long_t tick;
 151         compat_long_t ppsfreq;
 152         compat_long_t jitter;
 153         compat_int_t shift;
 154         compat_long_t stabil;
 155         compat_long_t jitcnt;
 156         compat_long_t calcnt;
 157         compat_long_t errcnt;
 158         compat_long_t stbcnt;
 159         compat_int_t tai;
 160
 161         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
 162         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
 163         compat_int_t:32; compat_int_t:32; compat_int_t:32;
 164 };
 165
 166 struct timex;
 167 int compat_get_timex(struct timex *, const struct compat_timex __user *);
 168 int compat_put_timex(struct compat_timex __user *, const struct timex *);
 169
 170 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 171
 172 typedef struct {
 173         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 174 } compat_sigset_t;
 175
 176 struct compat_sigaction {
 177 #ifndef __ARCH_HAS_IRIX_SIGACTION
 178         compat_uptr_t                   sa_handler;
 179         compat_ulong_t                  sa_flags;
 180 #else
 181         compat_uint_t                   sa_flags;
 182         compat_uptr_t                   sa_handler;
 183 #endif
 184 #ifdef __ARCH_HAS_SA_RESTORER
 185         compat_uptr_t                   sa_restorer;
 186 #endif
 187         compat_sigset_t                 sa_mask __packed;
 188 };
 189
 190 typedef union compat_sigval {
 191         compat_int_t    sival_int;
 192         compat_uptr_t   sival_ptr;
 193 } compat_sigval_t;
 194
 195 typedef struct compat_siginfo {
 196         int si_signo;
 197 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
 198         int si_errno;
 199         int si_code;
 200 #else
 201         int si_code;
 202         int si_errno;
 203 #endif
 204
 205         union {
 206                 int _pad[128/sizeof(int) - 3];
 207
 208                 /* kill() */
 209                 struct {
 210                         compat_pid_t _pid;      /* sender's pid */
 211                         __compat_uid32_t _uid;  /* sender's uid */
 212                 } _kill;
 213
 214                 /* POSIX.1b timers */
 215                 struct {
 216                         compat_timer_t _tid;    /* timer id */
 217                         int _overrun;           /* overrun count */
 218                         compat_sigval_t _sigval;        /* same as below */
 219                 } _timer;
 220
 221                 /* POSIX.1b signals */
 222                 struct {
 223                         compat_pid_t _pid;      /* sender's pid */
 224                         __compat_uid32_t _uid;  /* sender's uid */
 225                         compat_sigval_t _sigval;
 226                 } _rt;
 227
 228                 /* SIGCHLD */
 229                 struct {
 230                         compat_pid_t _pid;      /* which child */
 231                         __compat_uid32_t _uid;  /* sender's uid */
 232                         int _status;            /* exit code */
 233                         compat_clock_t _utime;
 234                         compat_clock_t _stime;
 235                 } _sigchld;
 236
 237 #ifdef CONFIG_X86_X32_ABI
 238                 /* SIGCHLD (x32 version) */
 239                 struct {
 240                         compat_pid_t _pid;      /* which child */
 241                         __compat_uid32_t _uid;  /* sender's uid */
 242                         int _status;            /* exit code */
 243                         compat_s64 _utime;
 244                         compat_s64 _stime;
 245                 } _sigchld_x32;
 246 #endif
 247
 248                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 249                 struct {
 250                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
 251 #ifdef __ARCH_SI_TRAPNO
 252                         int _trapno;    /* TRAP # which caused the signal */
 253 #endif
 254 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 255                                      sizeof(short) : __alignof__(compat_uptr_t))
 256                         union {
 257                                 /*
 258                                  * used when si_code=BUS_MCEERR_AR or
 259                                  * used when si_code=BUS_MCEERR_AO
 260                                  */
 261                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
 262                                 /* used when si_code=SEGV_BNDERR */
 263                                 struct {
 264                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
 265                                         compat_uptr_t _lower;
 266                                         compat_uptr_t _upper;
 267                                 } _addr_bnd;
 268                                 /* used when si_code=SEGV_PKUERR */
 269                                 struct {
 270                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
 271                                         u32 _pkey;
 272                                 } _addr_pkey;
 273                         };
 274                 } _sigfault;
 275
 276                 /* SIGPOLL */
 277                 struct {
 278                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 279                         int _fd;
 280                 } _sigpoll;
 281
 282                 struct {
 283                         compat_uptr_t _call_addr; /* calling user insn */
 284                         int _syscall;   /* triggering system call number */
 285                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 286                 } _sigsys;
 287         } _sifields;
 288 } compat_siginfo_t;
 289
 290 /*
 291  * These functions operate on 32- or 64-bit specs depending on
 292  * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments.
 293  */
 294 extern int compat_get_timespec(struct timespec *, const void __user *);
 295 extern int compat_put_timespec(const struct timespec *, void __user *);
 296 extern int compat_get_timeval(struct timeval *, const void __user *);
 297 extern int compat_put_timeval(const struct timeval *, void __user *);
 298
 299 struct compat_iovec {
 300         compat_uptr_t   iov_base;
 301         compat_size_t   iov_len;
 302 };
 303
 304 struct compat_rlimit {
 305         compat_ulong_t  rlim_cur;
 306         compat_ulong_t  rlim_max;
 307 };
 308
 309 struct compat_rusage {
 310         struct compat_timeval ru_utime;
 311         struct compat_timeval ru_stime;
 312         compat_long_t   ru_maxrss;
 313         compat_long_t   ru_ixrss;
 314         compat_long_t   ru_idrss;
 315         compat_long_t   ru_isrss;
 316         compat_long_t   ru_minflt;
 317         compat_long_t   ru_majflt;
 318         compat_long_t   ru_nswap;
 319         compat_long_t   ru_inblock;
 320         compat_long_t   ru_oublock;
 321         compat_long_t   ru_msgsnd;
 322         compat_long_t   ru_msgrcv;
 323         compat_long_t   ru_nsignals;
 324         compat_long_t   ru_nvcsw;
 325         compat_long_t   ru_nivcsw;
 326 };
 327
 328 extern int put_compat_rusage(const struct rusage *,
 329                              struct compat_rusage __user *);
 330
 331 struct compat_siginfo;
 332 struct __compat_aio_sigset;
 333
 334 struct compat_dirent {
 335         u32             d_ino;
 336         compat_off_t    d_off;
 337         u16             d_reclen;
 338         char            d_name[256];
 339 };
 340
 341 struct compat_ustat {
 342         compat_daddr_t          f_tfree;
 343         compat_ino_t            f_tinode;
 344         char                    f_fname[6];
 345         char                    f_fpack[6];
 346 };
 347
 348 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 349
 350 typedef struct compat_sigevent {
 351         compat_sigval_t sigev_value;
 352         compat_int_t sigev_signo;
 353         compat_int_t sigev_notify;
 354         union {
 355                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 356                 compat_int_t _tid;
 357
 358                 struct {
 359                         compat_uptr_t _function;
 360                         compat_uptr_t _attribute;
 361                 } _sigev_thread;
 362         } _sigev_un;
 363 } compat_sigevent_t;
 364
 365 struct compat_ifmap {
 366         compat_ulong_t mem_start;
 367         compat_ulong_t mem_end;
 368         unsigned short base_addr;
 369         unsigned char irq;
 370         unsigned char dma;
 371         unsigned char port;
 372 };
 373
 374 struct compat_if_settings {
 375         unsigned int type;      /* Type of physical device or protocol */
 376         unsigned int size;      /* Size of the data allocated by the caller */
 377         compat_uptr_t ifs_ifsu; /* union of pointers */
 378 };
 379
 380 struct compat_ifreq {
 381         union {
 382                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 383         } ifr_ifrn;
 384         union {
 385                 struct  sockaddr ifru_addr;
 386                 struct  sockaddr ifru_dstaddr;
 387                 struct  sockaddr ifru_broadaddr;
 388                 struct  sockaddr ifru_netmask;
 389                 struct  sockaddr ifru_hwaddr;
 390                 short   ifru_flags;
 391                 compat_int_t    ifru_ivalue;
 392                 compat_int_t    ifru_mtu;
 393                 struct  compat_ifmap ifru_map;
 394                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 395                 char    ifru_newname[IFNAMSIZ];
 396                 compat_caddr_t  ifru_data;
 397                 struct  compat_if_settings ifru_settings;
 398         } ifr_ifru;
 399 };
 400
 401 struct compat_ifconf {
 402         compat_int_t    ifc_len;                /* size of buffer */
 403         compat_caddr_t  ifcbuf;
 404 };
 405
 406 struct compat_robust_list {
 407         compat_uptr_t                   next;
 408 };
 409
 410 struct compat_robust_list_head {
 411         struct compat_robust_list       list;
 412         compat_long_t                   futex_offset;
 413         compat_uptr_t                   list_op_pending;
 414 };
 415
 416 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 417 struct compat_old_sigaction {
 418         compat_uptr_t                   sa_handler;
 419         compat_old_sigset_t             sa_mask;
 420         compat_ulong_t                  sa_flags;
 421         compat_uptr_t                   sa_restorer;
 422 };
 423 #endif
 424
 425 struct compat_keyctl_kdf_params {
 426         compat_uptr_t hashname;
 427         compat_uptr_t otherinfo;
 428         __u32 otherinfolen;
 429         __u32 __spare[8];
 430 };
 431
 432 struct compat_statfs;
 433 struct compat_statfs64;
 434 struct compat_old_linux_dirent;
 435 struct compat_linux_dirent;
 436 struct linux_dirent64;
 437 struct compat_msghdr;
 438 struct compat_mmsghdr;
 439 struct compat_sysinfo;
 440 struct compat_sysctl_args;
 441 struct compat_kexec_segment;
 442 struct compat_mq_attr;
 443 struct compat_msgbuf;
 444
 445 extern void compat_exit_robust_list(struct task_struct *curr);
 446
 447 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 448
 449 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 450
 451 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 452                        unsigned long bitmap_size);
 453 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 454                        unsigned long bitmap_size);
 455 int copy_siginfo_from_user32(siginfo_t *to, const struct compat_siginfo __user *from);
 456 int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from);
 457 int get_compat_sigevent(struct sigevent *event,
 458                 const struct compat_sigevent __user *u_event);
 459
 460 static inline int compat_timeval_compare(struct compat_timeval *lhs,
 461                                         struct compat_timeval *rhs)
 462 {
 463         if (lhs->tv_sec < rhs->tv_sec)
 464                 return -1;
 465         if (lhs->tv_sec > rhs->tv_sec)
 466                 return 1;
 467         return lhs->tv_usec - rhs->tv_usec;
 468 }
 469
 470 static inline int compat_timespec_compare(struct compat_timespec *lhs,
 471                                         struct compat_timespec *rhs)
 472 {
 473         if (lhs->tv_sec < rhs->tv_sec)
 474                 return -1;
 475         if (lhs->tv_sec > rhs->tv_sec)
 476                 return 1;
 477         return lhs->tv_nsec - rhs->tv_nsec;
 478 }
 479
 480 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 481
 482 /*
 483  * Defined inline such that size can be compile time constant, which avoids
 484  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 485  */
 486 static inline int
 487 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 488                   unsigned int size)
 489 {
 490         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 491 #ifdef __BIG_ENDIAN
 492         compat_sigset_t v;
 493         switch (_NSIG_WORDS) {
 494         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 495         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 496         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 497         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 498         }
 499         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 500 #else
 501         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 502 #endif
 503 }
 504
 505 extern int compat_ptrace_request(struct task_struct *child,
 506                                  compat_long_t request,
 507                                  compat_ulong_t addr, compat_ulong_t data);
 508
 509 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 510                                compat_ulong_t addr, compat_ulong_t data);
 511
 512 struct epoll_event;     /* fortunately, this one is fixed-layout */
 513
 514 extern ssize_t compat_rw_copy_check_uvector(int type,
 515                 const struct compat_iovec __user *uvector,
 516                 unsigned long nr_segs,
 517                 unsigned long fast_segs, struct iovec *fast_pointer,
 518                 struct iovec **ret_pointer);
 519
 520 extern void __user *compat_alloc_user_space(unsigned long len);
 521
 522 int compat_restore_altstack(const compat_stack_t __user *uss);
 523 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 524 #define compat_save_altstack_ex(uss, sp) do { \
 525         compat_stack_t __user *__uss = uss; \
 526         struct task_struct *t = current; \
 527         put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
 528         put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
 529         put_user_ex(t->sas_ss_size, &__uss->ss_size); \
 530         if (t->sas_ss_flags & SS_AUTODISARM) \
 531                 sas_ss_reset(t); \
 532 } while (0);
 533
 534 /*
 535  * These syscall function prototypes are kept in the same order as
 536  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 537  * go below.
 538  *
 539  * Please note that these prototypes here are only provided for information
 540  * purposes, for static analysis, and for linking from the syscall table.
 541  * These functions should not be called elsewhere from kernel code.
 542  *
 543  * As the syscall calling convention may be different from the default
 544  * for architectures overriding the syscall calling convention, do not
 545  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 546  */
 547 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 548 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 549 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 550                                      u32 __user *iocb);
 551 asmlinkage long compat_sys_io_getevents(compat_aio_context_t ctx_id,
 552                                         compat_long_t min_nr,
 553                                         compat_long_t nr,
 554                                         struct io_event __user *events,
 555                                         struct compat_timespec __user *timeout);
 556 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 557                                         compat_long_t min_nr,
 558                                         compat_long_t nr,
 559                                         struct io_event __user *events,
 560                                         struct compat_timespec __user *timeout,
 561                                         const struct __compat_aio_sigset __user *usig);
 562
 563 /* fs/cookies.c */
 564 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 565
 566 /* fs/eventpoll.c */
 567 asmlinkage long compat_sys_epoll_pwait(int epfd,
 568                         struct epoll_event __user *events,
 569                         int maxevents, int timeout,
 570                         const compat_sigset_t __user *sigmask,
 571                         compat_size_t sigsetsize);
 572
 573 /* fs/fcntl.c */
 574 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 575                                  compat_ulong_t arg);
 576 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 577                                    compat_ulong_t arg);
 578
 579 /* fs/ioctl.c */
 580 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 581                                  compat_ulong_t arg);
 582
 583 /* fs/namespace.c */
 584 asmlinkage long compat_sys_mount(const char __user *dev_name,
 585                                  const char __user *dir_name,
 586                                  const char __user *type, compat_ulong_t flags,
 587                                  const void __user *data);
 588
 589 /* fs/open.c */
 590 asmlinkage long compat_sys_statfs(const char __user *pathname,
 591                                   struct compat_statfs __user *buf);
 592 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 593                                     compat_size_t sz,
 594                                     struct compat_statfs64 __user *buf);
 595 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 596                                    struct compat_statfs __user *buf);
 597 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 598                                      struct compat_statfs64 __user *buf);
 599 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 600 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 601 /* No generic prototype for truncate64, ftruncate64, fallocate */
 602 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 603                                   int flags, umode_t mode);
 604
 605 /* fs/readdir.c */
 606 asmlinkage long compat_sys_getdents(unsigned int fd,
 607                                     struct compat_linux_dirent __user *dirent,
 608                                     unsigned int count);
 609
 610 /* fs/read_write.c */
 611 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 612 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 613                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 614 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 615                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 616 /* No generic prototype for pread64 and pwrite64 */
 617 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 618                 const struct compat_iovec __user *vec,
 619                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 620 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 621                 const struct compat_iovec __user *vec,
 622                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 623 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 624 asmlinkage long compat_sys_preadv64(unsigned long fd,
 625                 const struct compat_iovec __user *vec,
 626                 unsigned long vlen, loff_t pos);
 627 #endif
 628
 629 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 630 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 631                 const struct compat_iovec __user *vec,
 632                 unsigned long vlen, loff_t pos);
 633 #endif
 634
 635 /* fs/sendfile.c */
 636 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 637                                     compat_off_t __user *offset, compat_size_t count);
 638 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 639                                     compat_loff_t __user *offset, compat_size_t count);
 640
 641 /* fs/select.c */
 642 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
 643                                     compat_ulong_t __user *outp,
 644                                     compat_ulong_t __user *exp,
 645                                     struct compat_timespec __user *tsp,
 646                                     void __user *sig);
 647 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
 648                                  unsigned int nfds,
 649                                  struct compat_timespec __user *tsp,
 650                                  const compat_sigset_t __user *sigmask,
 651                                  compat_size_t sigsetsize);
 652
 653 /* fs/signalfd.c */
 654 asmlinkage long compat_sys_signalfd4(int ufd,
 655                                      const compat_sigset_t __user *sigmask,
 656                                      compat_size_t sigsetsize, int flags);
 657
 658 /* fs/splice.c */
 659 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 660                                     unsigned int nr_segs, unsigned int flags);
 661
 662 /* fs/stat.c */
 663 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 664                                       const char __user *filename,
 665                                       struct compat_stat __user *statbuf,
 666                                       int flag);
 667 asmlinkage long compat_sys_newfstat(unsigned int fd,
 668                                     struct compat_stat __user *statbuf);
 669
 670 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 671
 672 /* fs/timerfd.c */
 673 asmlinkage long compat_sys_timerfd_gettime(int ufd,
 674                                    struct compat_itimerspec __user *otmr);
 675 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
 676                                    const struct compat_itimerspec __user *utmr,
 677                                    struct compat_itimerspec __user *otmr);
 678
 679 /* fs/utimes.c */
 680 asmlinkage long compat_sys_utimensat(unsigned int dfd,
 681                                      const char __user *filename,
 682                                      struct compat_timespec __user *t,
 683                                      int flags);
 684
 685 /* kernel/exit.c */
 686 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 687                 struct compat_siginfo __user *, int,
 688                 struct compat_rusage __user *);
 689
 690
 691
 692 /* kernel/futex.c */
 693 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
 694                 struct compat_timespec __user *utime, u32 __user *uaddr2,
 695                 u32 val3);
 696 asmlinkage long
 697 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 698                            compat_size_t len);
 699 asmlinkage long
 700 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 701                            compat_size_t __user *len_ptr);
 702
 703 /* kernel/hrtimer.c */
 704 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 705                                      struct compat_timespec __user *rmtp);
 706
 707 /* kernel/itimer.c */
 708 asmlinkage long compat_sys_getitimer(int which,
 709                                      struct compat_itimerval __user *it);
 710 asmlinkage long compat_sys_setitimer(int which,
 711                                      struct compat_itimerval __user *in,
 712                                      struct compat_itimerval __user *out);
 713
 714 /* kernel/kexec.c */
 715 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 716                                       compat_ulong_t nr_segments,
 717                                       struct compat_kexec_segment __user *,
 718                                       compat_ulong_t flags);
 719
 720 /* kernel/posix-timers.c */
 721 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 722                         struct compat_sigevent __user *timer_event_spec,
 723                         timer_t __user *created_timer_id);
 724 asmlinkage long compat_sys_timer_gettime(timer_t timer_id,
 725                                  struct compat_itimerspec __user *setting);
 726 asmlinkage long compat_sys_timer_settime(timer_t timer_id, int flags,
 727                                          struct compat_itimerspec __user *new,
 728                                          struct compat_itimerspec __user *old);
 729 asmlinkage long compat_sys_clock_settime(clockid_t which_clock,
 730                                          struct compat_timespec __user *tp);
 731 asmlinkage long compat_sys_clock_gettime(clockid_t which_clock,
 732                                          struct compat_timespec __user *tp);
 733 asmlinkage long compat_sys_clock_getres(clockid_t which_clock,
 734                                         struct compat_timespec __user *tp);
 735 asmlinkage long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 736                                            struct compat_timespec __user *rqtp,
 737                                            struct compat_timespec __user *rmtp);
 738
 739 /* kernel/ptrace.c */
 740 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 741                                   compat_long_t addr, compat_long_t data);
 742
 743 /* kernel/sched/core.c */
 744 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 745                                      unsigned int len,
 746                                      compat_ulong_t __user *user_mask_ptr);
 747 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 748                                      unsigned int len,
 749                                      compat_ulong_t __user *user_mask_ptr);
 750 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
 751                                                  struct compat_timespec __user *interval);
 752
 753 /* kernel/signal.c */
 754 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 755                                        compat_stack_t __user *uoss_ptr);
 756 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 757                                          compat_size_t sigsetsize);
 758 #ifndef CONFIG_ODD_RT_SIGACTION
 759 asmlinkage long compat_sys_rt_sigaction(int,
 760                                  const struct compat_sigaction __user *,
 761                                  struct compat_sigaction __user *,
 762                                  compat_size_t);
 763 #endif
 764 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 765                                           compat_sigset_t __user *oset,
 766                                           compat_size_t sigsetsize);
 767 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 768                                          compat_size_t sigsetsize);
 769 asmlinkage long compat_sys_rt_sigtimedwait(compat_sigset_t __user *uthese,
 770                 struct compat_siginfo __user *uinfo,
 771                 struct compat_timespec __user *uts, compat_size_t sigsetsize);
 772 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 773                                 struct compat_siginfo __user *uinfo);
 774 /* No generic prototype for rt_sigreturn */
 775
 776 /* kernel/sys.c */
 777 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 778 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 779                                      struct compat_rlimit __user *rlim);
 780 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 781                                      struct compat_rlimit __user *rlim);
 782 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 783
 784 /* kernel/time.c */
 785 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 786                 struct timezone __user *tz);
 787 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 788                 struct timezone __user *tz);
 789 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
 790
 791 /* kernel/timer.c */
 792 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 793
 794 /* ipc/mqueue.c */
 795 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 796                         int oflag, compat_mode_t mode,
 797                         struct compat_mq_attr __user *u_attr);
 798 asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
 799                         const char __user *u_msg_ptr,
 800                         compat_size_t msg_len, unsigned int msg_prio,
 801                         const struct compat_timespec __user *u_abs_timeout);
 802 asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
 803                         char __user *u_msg_ptr,
 804                         compat_size_t msg_len, unsigned int __user *u_msg_prio,
 805                         const struct compat_timespec __user *u_abs_timeout);
 806 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 807                         const struct compat_sigevent __user *u_notification);
 808 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 809                         const struct compat_mq_attr __user *u_mqstat,
 810                         struct compat_mq_attr __user *u_omqstat);
 811
 812 /* ipc/msg.c */
 813 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 814 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 815                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 816 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 817                 compat_ssize_t msgsz, int msgflg);
 818
 819 /* ipc/sem.c */
 820 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 821 asmlinkage long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 822                 unsigned nsems, const struct compat_timespec __user *timeout);
 823
 824 /* ipc/shm.c */
 825 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 826 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 827
 828 /* net/socket.c */
 829 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 830                             unsigned flags, struct sockaddr __user *addr,
 831                             int __user *addrlen);
 832 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 833                                       char __user *optval, unsigned int optlen);
 834 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 835                                       char __user *optval, int __user *optlen);
 836 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 837                                    unsigned flags);
 838 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 839                                    unsigned int flags);
 840
 841 /* mm/filemap.c: No generic prototype for readahead */
 842
 843 /* security/keys/keyctl.c */
 844 asmlinkage long compat_sys_keyctl(u32 option,
 845                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 846
 847 /* arch/example/kernel/sys_example.c */
 848 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 849                      const compat_uptr_t __user *envp);
 850
 851 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 852
 853 /* mm/, CONFIG_MMU only */
 854 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 855                                  compat_ulong_t mode,
 856                                  compat_ulong_t __user *nmask,
 857                                  compat_ulong_t maxnode, compat_ulong_t flags);
 858 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 859                                          compat_ulong_t __user *nmask,
 860                                          compat_ulong_t maxnode,
 861                                          compat_ulong_t addr,
 862                                          compat_ulong_t flags);
 863 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 864                                          compat_ulong_t maxnode);
 865 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 866                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 867                 const compat_ulong_t __user *new_nodes);
 868 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 869                                       __u32 __user *pages,
 870                                       const int __user *nodes,
 871                                       int __user *status,
 872                                       int flags);
 873
 874 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 875                                         compat_pid_t pid, int sig,
 876                                         struct compat_siginfo __user *uinfo);
 877 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 878                                     unsigned vlen, unsigned int flags,
 879                                     struct compat_timespec __user *timeout);
 880 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 881                                  compat_uint_t __user *stat_addr, int options,
 882                                  struct compat_rusage __user *ru);
 883 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 884                                             int, const char __user *);
 885 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 886                                              struct file_handle __user *handle,
 887                                              int flags);
 888 asmlinkage long compat_sys_clock_adjtime(clockid_t which_clock,
 889                                          struct compat_timex __user *tp);
 890 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 891                                     unsigned vlen, unsigned int flags);
 892 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 893                 const struct compat_iovec __user *lvec,
 894                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 895                 compat_ulong_t riovcnt, compat_ulong_t flags);
 896 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 897                 const struct compat_iovec __user *lvec,
 898                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 899                 compat_ulong_t riovcnt, compat_ulong_t flags);
 900 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 901                      const compat_uptr_t __user *argv,
 902                      const compat_uptr_t __user *envp, int flags);
 903 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 904                 const struct compat_iovec __user *vec,
 905                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 906 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 907                 const struct compat_iovec __user *vec,
 908                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 909 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 910 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 911                 const struct compat_iovec __user *vec,
 912                 unsigned long vlen, loff_t pos, rwf_t flags);
 913 #endif
 914
 915 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 916 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 917                 const struct compat_iovec __user *vec,
 918                 unsigned long vlen, loff_t pos, rwf_t flags);
 919 #endif
 920
 921
 922 /*
 923  * Deprecated system calls which are still defined in
 924  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 925  */
 926
 927 /* __ARCH_WANT_SYSCALL_NO_AT */
 928 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 929                                 umode_t mode);
 930 asmlinkage long compat_sys_utimes(const char __user *filename,
 931                                   struct compat_timeval __user *t);
 932
 933 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 934 asmlinkage long compat_sys_signalfd(int ufd,
 935                                     const compat_sigset_t __user *sigmask,
 936                                     compat_size_t sigsetsize);
 937
 938 /* __ARCH_WANT_SYSCALL_OFF_T */
 939 asmlinkage long compat_sys_newstat(const char __user *filename,
 940                                    struct compat_stat __user *statbuf);
 941 asmlinkage long compat_sys_newlstat(const char __user *filename,
 942                                     struct compat_stat __user *statbuf);
 943
 944 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 945 asmlinkage long compat_sys_time(compat_time_t __user *tloc);
 946 asmlinkage long compat_sys_utime(const char __user *filename,
 947                                  struct compat_utimbuf __user *t);
 948 asmlinkage long compat_sys_futimesat(unsigned int dfd,
 949                                      const char __user *filename,
 950                                      struct compat_timeval __user *t);
 951 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 952                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 953                 struct compat_timeval __user *tvp);
 954 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 955 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 956                                 unsigned flags);
 957 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
 958
 959 /* obsolete: fs/readdir.c */
 960 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 961                                        struct compat_old_linux_dirent __user *,
 962                                        unsigned int count);
 963
 964 /* obsolete: fs/select.c */
 965 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 966
 967 /* obsolete: ipc */
 968 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 969
 970 /* obsolete: kernel/signal.c */
 971 #ifdef __ARCH_WANT_SYS_SIGPENDING
 972 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 973 #endif
 974
 975 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 976 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 977                                        compat_old_sigset_t __user *oset);
 978 #endif
 979 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 980 asmlinkage long compat_sys_sigaction(int sig,
 981                                    const struct compat_old_sigaction __user *act,
 982                                    struct compat_old_sigaction __user *oact);
 983 #endif
 984
 985 /* obsolete: kernel/time/time.c */
 986 asmlinkage long compat_sys_stime(compat_time_t __user *tptr);
 987
 988 /* obsolete: net/socket.c */
 989 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 990
 991 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 992
 993
 994 /*
 995  * For most but not all architectures, "am I in a compat syscall?" and
 996  * "am I a compat task?" are the same question.  For architectures on which
 997  * they aren't the same question, arch code can override in_compat_syscall.
 998  */
 999
1000 #ifndef in_compat_syscall
1001 static inline bool in_compat_syscall(void) { return is_compat_task(); }
1002 #endif
1003
1004 /**
1005  * ns_to_compat_timeval - Compat version of ns_to_timeval
1006  * @nsec:       the nanoseconds value to be converted
1007  *
1008  * Returns the compat_timeval representation of the nsec parameter.
1009  */
1010 static inline struct compat_timeval ns_to_compat_timeval(s64 nsec)
1011 {
1012         struct timeval tv;
1013         struct compat_timeval ctv;
1014
1015         tv = ns_to_timeval(nsec);
1016         ctv.tv_sec = tv.tv_sec;
1017         ctv.tv_usec = tv.tv_usec;
1018
1019         return ctv;
1020 }
1021
1022 #else /* !CONFIG_COMPAT */
1023
1024 #define is_compat_task() (0)
1025 #ifndef in_compat_syscall
1026 static inline bool in_compat_syscall(void) { return false; }
1027 #endif
1028
1029 #endif /* CONFIG_COMPAT */
1030
1031 #endif /* _LINUX_COMPAT_H */