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         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));       \
  76         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))        \
  77                 __attribute__((alias(__stringify(__se_compat_sys##name))));     \
  78         ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO);                         \
  79         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  80         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));  \
  81         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))   \
  82         {                                                                       \
  83                 return __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
  84         }                                                                       \
  85         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
  86 #endif /* COMPAT_SYSCALL_DEFINEx */
  87
  88 #ifdef CONFIG_COMPAT
  89
  90 #ifndef compat_user_stack_pointer
  91 #define compat_user_stack_pointer() current_user_stack_pointer()
  92 #endif
  93 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
  94 typedef struct compat_sigaltstack {
  95         compat_uptr_t                   ss_sp;
  96         int                             ss_flags;
  97         compat_size_t                   ss_size;
  98 } compat_stack_t;
  99 #endif
 100
 101 #define compat_jiffies_to_clock_t(x)    \
 102                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
 103
 104 typedef __compat_uid32_t        compat_uid_t;
 105 typedef __compat_gid32_t        compat_gid_t;
 106
 107 typedef compat_ulong_t          compat_aio_context_t;
 108
 109 struct compat_sel_arg_struct;
 110 struct rusage;
 111
 112 struct compat_itimerspec {
 113         struct compat_timespec it_interval;
 114         struct compat_timespec it_value;
 115 };
 116
 117 struct compat_utimbuf {
 118         compat_time_t           actime;
 119         compat_time_t           modtime;
 120 };
 121
 122 struct compat_itimerval {
 123         struct compat_timeval   it_interval;
 124         struct compat_timeval   it_value;
 125 };
 126
 127 struct itimerval;
 128 int get_compat_itimerval(struct itimerval *, const struct compat_itimerval __user *);
 129 int put_compat_itimerval(struct compat_itimerval __user *, const struct itimerval *);
 130
 131 struct compat_tms {
 132         compat_clock_t          tms_utime;
 133         compat_clock_t          tms_stime;
 134         compat_clock_t          tms_cutime;
 135         compat_clock_t          tms_cstime;
 136 };
 137
 138 struct compat_timex {
 139         compat_uint_t modes;
 140         compat_long_t offset;
 141         compat_long_t freq;
 142         compat_long_t maxerror;
 143         compat_long_t esterror;
 144         compat_int_t status;
 145         compat_long_t constant;
 146         compat_long_t precision;
 147         compat_long_t tolerance;
 148         struct compat_timeval time;
 149         compat_long_t tick;
 150         compat_long_t ppsfreq;
 151         compat_long_t jitter;
 152         compat_int_t shift;
 153         compat_long_t stabil;
 154         compat_long_t jitcnt;
 155         compat_long_t calcnt;
 156         compat_long_t errcnt;
 157         compat_long_t stbcnt;
 158         compat_int_t tai;
 159
 160         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
 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;
 163 };
 164
 165 struct timex;
 166 int compat_get_timex(struct timex *, const struct compat_timex __user *);
 167 int compat_put_timex(struct compat_timex __user *, const struct timex *);
 168
 169 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 170
 171 typedef struct {
 172         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 173 } compat_sigset_t;
 174
 175 struct compat_sigaction {
 176 #ifndef __ARCH_HAS_IRIX_SIGACTION
 177         compat_uptr_t                   sa_handler;
 178         compat_ulong_t                  sa_flags;
 179 #else
 180         compat_uint_t                   sa_flags;
 181         compat_uptr_t                   sa_handler;
 182 #endif
 183 #ifdef __ARCH_HAS_SA_RESTORER
 184         compat_uptr_t                   sa_restorer;
 185 #endif
 186         compat_sigset_t                 sa_mask __packed;
 187 };
 188
 189 typedef union compat_sigval {
 190         compat_int_t    sival_int;
 191         compat_uptr_t   sival_ptr;
 192 } compat_sigval_t;
 193
 194 typedef struct compat_siginfo {
 195         int si_signo;
 196 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
 197         int si_errno;
 198         int si_code;
 199 #else
 200         int si_code;
 201         int si_errno;
 202 #endif
 203
 204         union {
 205                 int _pad[128/sizeof(int) - 3];
 206
 207                 /* kill() */
 208                 struct {
 209                         compat_pid_t _pid;      /* sender's pid */
 210                         __compat_uid32_t _uid;  /* sender's uid */
 211                 } _kill;
 212
 213                 /* POSIX.1b timers */
 214                 struct {
 215                         compat_timer_t _tid;    /* timer id */
 216                         int _overrun;           /* overrun count */
 217                         compat_sigval_t _sigval;        /* same as below */
 218                 } _timer;
 219
 220                 /* POSIX.1b signals */
 221                 struct {
 222                         compat_pid_t _pid;      /* sender's pid */
 223                         __compat_uid32_t _uid;  /* sender's uid */
 224                         compat_sigval_t _sigval;
 225                 } _rt;
 226
 227                 /* SIGCHLD */
 228                 struct {
 229                         compat_pid_t _pid;      /* which child */
 230                         __compat_uid32_t _uid;  /* sender's uid */
 231                         int _status;            /* exit code */
 232                         compat_clock_t _utime;
 233                         compat_clock_t _stime;
 234                 } _sigchld;
 235
 236 #ifdef CONFIG_X86_X32_ABI
 237                 /* SIGCHLD (x32 version) */
 238                 struct {
 239                         compat_pid_t _pid;      /* which child */
 240                         __compat_uid32_t _uid;  /* sender's uid */
 241                         int _status;            /* exit code */
 242                         compat_s64 _utime;
 243                         compat_s64 _stime;
 244                 } _sigchld_x32;
 245 #endif
 246
 247                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 248                 struct {
 249                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
 250 #ifdef __ARCH_SI_TRAPNO
 251                         int _trapno;    /* TRAP # which caused the signal */
 252 #endif
 253 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 254                                      sizeof(short) : __alignof__(compat_uptr_t))
 255                         union {
 256                                 /*
 257                                  * used when si_code=BUS_MCEERR_AR or
 258                                  * used when si_code=BUS_MCEERR_AO
 259                                  */
 260                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
 261                                 /* used when si_code=SEGV_BNDERR */
 262                                 struct {
 263                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
 264                                         compat_uptr_t _lower;
 265                                         compat_uptr_t _upper;
 266                                 } _addr_bnd;
 267                                 /* used when si_code=SEGV_PKUERR */
 268                                 struct {
 269                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
 270                                         u32 _pkey;
 271                                 } _addr_pkey;
 272                         };
 273                 } _sigfault;
 274
 275                 /* SIGPOLL */
 276                 struct {
 277                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 278                         int _fd;
 279                 } _sigpoll;
 280
 281                 struct {
 282                         compat_uptr_t _call_addr; /* calling user insn */
 283                         int _syscall;   /* triggering system call number */
 284                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 285                 } _sigsys;
 286         } _sifields;
 287 } compat_siginfo_t;
 288
 289 /*
 290  * These functions operate on 32- or 64-bit specs depending on
 291  * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments.
 292  */
 293 extern int compat_get_timespec(struct timespec *, const void __user *);
 294 extern int compat_put_timespec(const struct timespec *, void __user *);
 295 extern int compat_get_timeval(struct timeval *, const void __user *);
 296 extern int compat_put_timeval(const struct timeval *, void __user *);
 297 extern int get_compat_itimerspec64(struct itimerspec64 *its,
 298                         const struct compat_itimerspec __user *uits);
 299 extern int put_compat_itimerspec64(const struct itimerspec64 *its,
 300                         struct compat_itimerspec __user *uits);
 301
 302 struct compat_iovec {
 303         compat_uptr_t   iov_base;
 304         compat_size_t   iov_len;
 305 };
 306
 307 struct compat_rlimit {
 308         compat_ulong_t  rlim_cur;
 309         compat_ulong_t  rlim_max;
 310 };
 311
 312 struct compat_rusage {
 313         struct compat_timeval ru_utime;
 314         struct compat_timeval ru_stime;
 315         compat_long_t   ru_maxrss;
 316         compat_long_t   ru_ixrss;
 317         compat_long_t   ru_idrss;
 318         compat_long_t   ru_isrss;
 319         compat_long_t   ru_minflt;
 320         compat_long_t   ru_majflt;
 321         compat_long_t   ru_nswap;
 322         compat_long_t   ru_inblock;
 323         compat_long_t   ru_oublock;
 324         compat_long_t   ru_msgsnd;
 325         compat_long_t   ru_msgrcv;
 326         compat_long_t   ru_nsignals;
 327         compat_long_t   ru_nvcsw;
 328         compat_long_t   ru_nivcsw;
 329 };
 330
 331 extern int put_compat_rusage(const struct rusage *,
 332                              struct compat_rusage __user *);
 333
 334 struct compat_siginfo;
 335 struct __compat_aio_sigset;
 336
 337 struct compat_dirent {
 338         u32             d_ino;
 339         compat_off_t    d_off;
 340         u16             d_reclen;
 341         char            d_name[256];
 342 };
 343
 344 struct compat_ustat {
 345         compat_daddr_t          f_tfree;
 346         compat_ino_t            f_tinode;
 347         char                    f_fname[6];
 348         char                    f_fpack[6];
 349 };
 350
 351 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 352
 353 typedef struct compat_sigevent {
 354         compat_sigval_t sigev_value;
 355         compat_int_t sigev_signo;
 356         compat_int_t sigev_notify;
 357         union {
 358                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 359                 compat_int_t _tid;
 360
 361                 struct {
 362                         compat_uptr_t _function;
 363                         compat_uptr_t _attribute;
 364                 } _sigev_thread;
 365         } _sigev_un;
 366 } compat_sigevent_t;
 367
 368 struct compat_ifmap {
 369         compat_ulong_t mem_start;
 370         compat_ulong_t mem_end;
 371         unsigned short base_addr;
 372         unsigned char irq;
 373         unsigned char dma;
 374         unsigned char port;
 375 };
 376
 377 struct compat_if_settings {
 378         unsigned int type;      /* Type of physical device or protocol */
 379         unsigned int size;      /* Size of the data allocated by the caller */
 380         compat_uptr_t ifs_ifsu; /* union of pointers */
 381 };
 382
 383 struct compat_ifreq {
 384         union {
 385                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 386         } ifr_ifrn;
 387         union {
 388                 struct  sockaddr ifru_addr;
 389                 struct  sockaddr ifru_dstaddr;
 390                 struct  sockaddr ifru_broadaddr;
 391                 struct  sockaddr ifru_netmask;
 392                 struct  sockaddr ifru_hwaddr;
 393                 short   ifru_flags;
 394                 compat_int_t    ifru_ivalue;
 395                 compat_int_t    ifru_mtu;
 396                 struct  compat_ifmap ifru_map;
 397                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 398                 char    ifru_newname[IFNAMSIZ];
 399                 compat_caddr_t  ifru_data;
 400                 struct  compat_if_settings ifru_settings;
 401         } ifr_ifru;
 402 };
 403
 404 struct compat_ifconf {
 405         compat_int_t    ifc_len;                /* size of buffer */
 406         compat_caddr_t  ifcbuf;
 407 };
 408
 409 struct compat_robust_list {
 410         compat_uptr_t                   next;
 411 };
 412
 413 struct compat_robust_list_head {
 414         struct compat_robust_list       list;
 415         compat_long_t                   futex_offset;
 416         compat_uptr_t                   list_op_pending;
 417 };
 418
 419 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 420 struct compat_old_sigaction {
 421         compat_uptr_t                   sa_handler;
 422         compat_old_sigset_t             sa_mask;
 423         compat_ulong_t                  sa_flags;
 424         compat_uptr_t                   sa_restorer;
 425 };
 426 #endif
 427
 428 struct compat_keyctl_kdf_params {
 429         compat_uptr_t hashname;
 430         compat_uptr_t otherinfo;
 431         __u32 otherinfolen;
 432         __u32 __spare[8];
 433 };
 434
 435 struct compat_statfs;
 436 struct compat_statfs64;
 437 struct compat_old_linux_dirent;
 438 struct compat_linux_dirent;
 439 struct linux_dirent64;
 440 struct compat_msghdr;
 441 struct compat_mmsghdr;
 442 struct compat_sysinfo;
 443 struct compat_sysctl_args;
 444 struct compat_kexec_segment;
 445 struct compat_mq_attr;
 446 struct compat_msgbuf;
 447
 448 extern void compat_exit_robust_list(struct task_struct *curr);
 449
 450 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 451
 452 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 453
 454 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 455                        unsigned long bitmap_size);
 456 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 457                        unsigned long bitmap_size);
 458 int copy_siginfo_from_user32(siginfo_t *to, const struct compat_siginfo __user *from);
 459 int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from);
 460 int get_compat_sigevent(struct sigevent *event,
 461                 const struct compat_sigevent __user *u_event);
 462
 463 static inline int compat_timeval_compare(struct compat_timeval *lhs,
 464                                         struct compat_timeval *rhs)
 465 {
 466         if (lhs->tv_sec < rhs->tv_sec)
 467                 return -1;
 468         if (lhs->tv_sec > rhs->tv_sec)
 469                 return 1;
 470         return lhs->tv_usec - rhs->tv_usec;
 471 }
 472
 473 static inline int compat_timespec_compare(struct compat_timespec *lhs,
 474                                         struct compat_timespec *rhs)
 475 {
 476         if (lhs->tv_sec < rhs->tv_sec)
 477                 return -1;
 478         if (lhs->tv_sec > rhs->tv_sec)
 479                 return 1;
 480         return lhs->tv_nsec - rhs->tv_nsec;
 481 }
 482
 483 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 484
 485 /*
 486  * Defined inline such that size can be compile time constant, which avoids
 487  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 488  */
 489 static inline int
 490 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 491                   unsigned int size)
 492 {
 493         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 494 #ifdef __BIG_ENDIAN
 495         compat_sigset_t v;
 496         switch (_NSIG_WORDS) {
 497         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 498         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 499         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 500         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 501         }
 502         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 503 #else
 504         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 505 #endif
 506 }
 507
 508 extern int compat_ptrace_request(struct task_struct *child,
 509                                  compat_long_t request,
 510                                  compat_ulong_t addr, compat_ulong_t data);
 511
 512 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 513                                compat_ulong_t addr, compat_ulong_t data);
 514
 515 struct epoll_event;     /* fortunately, this one is fixed-layout */
 516
 517 extern ssize_t compat_rw_copy_check_uvector(int type,
 518                 const struct compat_iovec __user *uvector,
 519                 unsigned long nr_segs,
 520                 unsigned long fast_segs, struct iovec *fast_pointer,
 521                 struct iovec **ret_pointer);
 522
 523 extern void __user *compat_alloc_user_space(unsigned long len);
 524
 525 int compat_restore_altstack(const compat_stack_t __user *uss);
 526 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 527 #define compat_save_altstack_ex(uss, sp) do { \
 528         compat_stack_t __user *__uss = uss; \
 529         struct task_struct *t = current; \
 530         put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
 531         put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
 532         put_user_ex(t->sas_ss_size, &__uss->ss_size); \
 533         if (t->sas_ss_flags & SS_AUTODISARM) \
 534                 sas_ss_reset(t); \
 535 } while (0);
 536
 537 /*
 538  * These syscall function prototypes are kept in the same order as
 539  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 540  * go below.
 541  *
 542  * Please note that these prototypes here are only provided for information
 543  * purposes, for static analysis, and for linking from the syscall table.
 544  * These functions should not be called elsewhere from kernel code.
 545  *
 546  * As the syscall calling convention may be different from the default
 547  * for architectures overriding the syscall calling convention, do not
 548  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 549  */
 550 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 551 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 552 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 553                                      u32 __user *iocb);
 554 asmlinkage long compat_sys_io_getevents(compat_aio_context_t ctx_id,
 555                                         compat_long_t min_nr,
 556                                         compat_long_t nr,
 557                                         struct io_event __user *events,
 558                                         struct compat_timespec __user *timeout);
 559 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 560                                         compat_long_t min_nr,
 561                                         compat_long_t nr,
 562                                         struct io_event __user *events,
 563                                         struct compat_timespec __user *timeout,
 564                                         const struct __compat_aio_sigset __user *usig);
 565
 566 /* fs/cookies.c */
 567 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 568
 569 /* fs/eventpoll.c */
 570 asmlinkage long compat_sys_epoll_pwait(int epfd,
 571                         struct epoll_event __user *events,
 572                         int maxevents, int timeout,
 573                         const compat_sigset_t __user *sigmask,
 574                         compat_size_t sigsetsize);
 575
 576 /* fs/fcntl.c */
 577 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 578                                  compat_ulong_t arg);
 579 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 580                                    compat_ulong_t arg);
 581
 582 /* fs/ioctl.c */
 583 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 584                                  compat_ulong_t arg);
 585
 586 /* fs/namespace.c */
 587 asmlinkage long compat_sys_mount(const char __user *dev_name,
 588                                  const char __user *dir_name,
 589                                  const char __user *type, compat_ulong_t flags,
 590                                  const void __user *data);
 591
 592 /* fs/open.c */
 593 asmlinkage long compat_sys_statfs(const char __user *pathname,
 594                                   struct compat_statfs __user *buf);
 595 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 596                                     compat_size_t sz,
 597                                     struct compat_statfs64 __user *buf);
 598 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 599                                    struct compat_statfs __user *buf);
 600 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 601                                      struct compat_statfs64 __user *buf);
 602 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 603 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 604 /* No generic prototype for truncate64, ftruncate64, fallocate */
 605 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 606                                   int flags, umode_t mode);
 607
 608 /* fs/readdir.c */
 609 asmlinkage long compat_sys_getdents(unsigned int fd,
 610                                     struct compat_linux_dirent __user *dirent,
 611                                     unsigned int count);
 612
 613 /* fs/read_write.c */
 614 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 615 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 616                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 617 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 618                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 619 /* No generic prototype for pread64 and pwrite64 */
 620 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 621                 const struct compat_iovec __user *vec,
 622                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 623 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 624                 const struct compat_iovec __user *vec,
 625                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 626 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 627 asmlinkage long compat_sys_preadv64(unsigned long fd,
 628                 const struct compat_iovec __user *vec,
 629                 unsigned long vlen, loff_t pos);
 630 #endif
 631
 632 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 633 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 634                 const struct compat_iovec __user *vec,
 635                 unsigned long vlen, loff_t pos);
 636 #endif
 637
 638 /* fs/sendfile.c */
 639 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 640                                     compat_off_t __user *offset, compat_size_t count);
 641 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 642                                     compat_loff_t __user *offset, compat_size_t count);
 643
 644 /* fs/select.c */
 645 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
 646                                     compat_ulong_t __user *outp,
 647                                     compat_ulong_t __user *exp,
 648                                     struct compat_timespec __user *tsp,
 649                                     void __user *sig);
 650 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
 651                                  unsigned int nfds,
 652                                  struct compat_timespec __user *tsp,
 653                                  const compat_sigset_t __user *sigmask,
 654                                  compat_size_t sigsetsize);
 655
 656 /* fs/signalfd.c */
 657 asmlinkage long compat_sys_signalfd4(int ufd,
 658                                      const compat_sigset_t __user *sigmask,
 659                                      compat_size_t sigsetsize, int flags);
 660
 661 /* fs/splice.c */
 662 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 663                                     unsigned int nr_segs, unsigned int flags);
 664
 665 /* fs/stat.c */
 666 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 667                                       const char __user *filename,
 668                                       struct compat_stat __user *statbuf,
 669                                       int flag);
 670 asmlinkage long compat_sys_newfstat(unsigned int fd,
 671                                     struct compat_stat __user *statbuf);
 672
 673 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 674
 675 /* fs/timerfd.c */
 676 asmlinkage long compat_sys_timerfd_gettime(int ufd,
 677                                    struct compat_itimerspec __user *otmr);
 678 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
 679                                    const struct compat_itimerspec __user *utmr,
 680                                    struct compat_itimerspec __user *otmr);
 681
 682 /* fs/utimes.c */
 683 asmlinkage long compat_sys_utimensat(unsigned int dfd,
 684                                      const char __user *filename,
 685                                      struct compat_timespec __user *t,
 686                                      int flags);
 687
 688 /* kernel/exit.c */
 689 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 690                 struct compat_siginfo __user *, int,
 691                 struct compat_rusage __user *);
 692
 693
 694
 695 /* kernel/futex.c */
 696 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
 697                 struct compat_timespec __user *utime, u32 __user *uaddr2,
 698                 u32 val3);
 699 asmlinkage long
 700 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 701                            compat_size_t len);
 702 asmlinkage long
 703 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 704                            compat_size_t __user *len_ptr);
 705
 706 /* kernel/hrtimer.c */
 707 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 708                                      struct compat_timespec __user *rmtp);
 709
 710 /* kernel/itimer.c */
 711 asmlinkage long compat_sys_getitimer(int which,
 712                                      struct compat_itimerval __user *it);
 713 asmlinkage long compat_sys_setitimer(int which,
 714                                      struct compat_itimerval __user *in,
 715                                      struct compat_itimerval __user *out);
 716
 717 /* kernel/kexec.c */
 718 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 719                                       compat_ulong_t nr_segments,
 720                                       struct compat_kexec_segment __user *,
 721                                       compat_ulong_t flags);
 722
 723 /* kernel/posix-timers.c */
 724 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 725                         struct compat_sigevent __user *timer_event_spec,
 726                         timer_t __user *created_timer_id);
 727 asmlinkage long compat_sys_timer_gettime(timer_t timer_id,
 728                                  struct compat_itimerspec __user *setting);
 729 asmlinkage long compat_sys_timer_settime(timer_t timer_id, int flags,
 730                                          struct compat_itimerspec __user *new,
 731                                          struct compat_itimerspec __user *old);
 732 asmlinkage long compat_sys_clock_settime(clockid_t which_clock,
 733                                          struct compat_timespec __user *tp);
 734 asmlinkage long compat_sys_clock_gettime(clockid_t which_clock,
 735                                          struct compat_timespec __user *tp);
 736 asmlinkage long compat_sys_clock_getres(clockid_t which_clock,
 737                                         struct compat_timespec __user *tp);
 738 asmlinkage long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 739                                            struct compat_timespec __user *rqtp,
 740                                            struct compat_timespec __user *rmtp);
 741
 742 /* kernel/ptrace.c */
 743 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 744                                   compat_long_t addr, compat_long_t data);
 745
 746 /* kernel/sched/core.c */
 747 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 748                                      unsigned int len,
 749                                      compat_ulong_t __user *user_mask_ptr);
 750 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 751                                      unsigned int len,
 752                                      compat_ulong_t __user *user_mask_ptr);
 753 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
 754                                                  struct compat_timespec __user *interval);
 755
 756 /* kernel/signal.c */
 757 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 758                                        compat_stack_t __user *uoss_ptr);
 759 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 760                                          compat_size_t sigsetsize);
 761 #ifndef CONFIG_ODD_RT_SIGACTION
 762 asmlinkage long compat_sys_rt_sigaction(int,
 763                                  const struct compat_sigaction __user *,
 764                                  struct compat_sigaction __user *,
 765                                  compat_size_t);
 766 #endif
 767 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 768                                           compat_sigset_t __user *oset,
 769                                           compat_size_t sigsetsize);
 770 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 771                                          compat_size_t sigsetsize);
 772 asmlinkage long compat_sys_rt_sigtimedwait(compat_sigset_t __user *uthese,
 773                 struct compat_siginfo __user *uinfo,
 774                 struct compat_timespec __user *uts, compat_size_t sigsetsize);
 775 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 776                                 struct compat_siginfo __user *uinfo);
 777 /* No generic prototype for rt_sigreturn */
 778
 779 /* kernel/sys.c */
 780 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 781 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 782                                      struct compat_rlimit __user *rlim);
 783 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 784                                      struct compat_rlimit __user *rlim);
 785 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 786
 787 /* kernel/time.c */
 788 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 789                 struct timezone __user *tz);
 790 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 791                 struct timezone __user *tz);
 792 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
 793
 794 /* kernel/timer.c */
 795 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 796
 797 /* ipc/mqueue.c */
 798 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 799                         int oflag, compat_mode_t mode,
 800                         struct compat_mq_attr __user *u_attr);
 801 asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
 802                         const char __user *u_msg_ptr,
 803                         compat_size_t msg_len, unsigned int msg_prio,
 804                         const struct compat_timespec __user *u_abs_timeout);
 805 asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
 806                         char __user *u_msg_ptr,
 807                         compat_size_t msg_len, unsigned int __user *u_msg_prio,
 808                         const struct compat_timespec __user *u_abs_timeout);
 809 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 810                         const struct compat_sigevent __user *u_notification);
 811 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 812                         const struct compat_mq_attr __user *u_mqstat,
 813                         struct compat_mq_attr __user *u_omqstat);
 814
 815 /* ipc/msg.c */
 816 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 817 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 818                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 819 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 820                 compat_ssize_t msgsz, int msgflg);
 821
 822 /* ipc/sem.c */
 823 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 824 asmlinkage long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 825                 unsigned nsems, const struct compat_timespec __user *timeout);
 826
 827 /* ipc/shm.c */
 828 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 829 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 830
 831 /* net/socket.c */
 832 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 833                             unsigned flags, struct sockaddr __user *addr,
 834                             int __user *addrlen);
 835 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 836                                       char __user *optval, unsigned int optlen);
 837 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 838                                       char __user *optval, int __user *optlen);
 839 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 840                                    unsigned flags);
 841 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 842                                    unsigned int flags);
 843
 844 /* mm/filemap.c: No generic prototype for readahead */
 845
 846 /* security/keys/keyctl.c */
 847 asmlinkage long compat_sys_keyctl(u32 option,
 848                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 849
 850 /* arch/example/kernel/sys_example.c */
 851 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 852                      const compat_uptr_t __user *envp);
 853
 854 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 855
 856 /* mm/, CONFIG_MMU only */
 857 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 858                                  compat_ulong_t mode,
 859                                  compat_ulong_t __user *nmask,
 860                                  compat_ulong_t maxnode, compat_ulong_t flags);
 861 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 862                                          compat_ulong_t __user *nmask,
 863                                          compat_ulong_t maxnode,
 864                                          compat_ulong_t addr,
 865                                          compat_ulong_t flags);
 866 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 867                                          compat_ulong_t maxnode);
 868 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 869                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 870                 const compat_ulong_t __user *new_nodes);
 871 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 872                                       __u32 __user *pages,
 873                                       const int __user *nodes,
 874                                       int __user *status,
 875                                       int flags);
 876
 877 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 878                                         compat_pid_t pid, int sig,
 879                                         struct compat_siginfo __user *uinfo);
 880 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 881                                     unsigned vlen, unsigned int flags,
 882                                     struct compat_timespec __user *timeout);
 883 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 884                                  compat_uint_t __user *stat_addr, int options,
 885                                  struct compat_rusage __user *ru);
 886 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 887                                             int, const char __user *);
 888 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 889                                              struct file_handle __user *handle,
 890                                              int flags);
 891 asmlinkage long compat_sys_clock_adjtime(clockid_t which_clock,
 892                                          struct compat_timex __user *tp);
 893 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 894                                     unsigned vlen, unsigned int flags);
 895 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 896                 const struct compat_iovec __user *lvec,
 897                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 898                 compat_ulong_t riovcnt, compat_ulong_t flags);
 899 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 900                 const struct compat_iovec __user *lvec,
 901                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 902                 compat_ulong_t riovcnt, compat_ulong_t flags);
 903 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 904                      const compat_uptr_t __user *argv,
 905                      const compat_uptr_t __user *envp, int flags);
 906 asmlinkage ssize_t compat_sys_preadv2(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 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 910                 const struct compat_iovec __user *vec,
 911                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 912 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 913 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 914                 const struct compat_iovec __user *vec,
 915                 unsigned long vlen, loff_t pos, rwf_t flags);
 916 #endif
 917
 918 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 919 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 920                 const struct compat_iovec __user *vec,
 921                 unsigned long vlen, loff_t pos, rwf_t flags);
 922 #endif
 923
 924
 925 /*
 926  * Deprecated system calls which are still defined in
 927  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 928  */
 929
 930 /* __ARCH_WANT_SYSCALL_NO_AT */
 931 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 932                                 umode_t mode);
 933 asmlinkage long compat_sys_utimes(const char __user *filename,
 934                                   struct compat_timeval __user *t);
 935
 936 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 937 asmlinkage long compat_sys_signalfd(int ufd,
 938                                     const compat_sigset_t __user *sigmask,
 939                                     compat_size_t sigsetsize);
 940
 941 /* __ARCH_WANT_SYSCALL_OFF_T */
 942 asmlinkage long compat_sys_newstat(const char __user *filename,
 943                                    struct compat_stat __user *statbuf);
 944 asmlinkage long compat_sys_newlstat(const char __user *filename,
 945                                     struct compat_stat __user *statbuf);
 946
 947 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 948 asmlinkage long compat_sys_time(compat_time_t __user *tloc);
 949 asmlinkage long compat_sys_utime(const char __user *filename,
 950                                  struct compat_utimbuf __user *t);
 951 asmlinkage long compat_sys_futimesat(unsigned int dfd,
 952                                      const char __user *filename,
 953                                      struct compat_timeval __user *t);
 954 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 955                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 956                 struct compat_timeval __user *tvp);
 957 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 958 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 959                                 unsigned flags);
 960 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
 961
 962 /* obsolete: fs/readdir.c */
 963 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 964                                        struct compat_old_linux_dirent __user *,
 965                                        unsigned int count);
 966
 967 /* obsolete: fs/select.c */
 968 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 969
 970 /* obsolete: ipc */
 971 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 972
 973 /* obsolete: kernel/signal.c */
 974 #ifdef __ARCH_WANT_SYS_SIGPENDING
 975 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 976 #endif
 977
 978 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 979 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 980                                        compat_old_sigset_t __user *oset);
 981 #endif
 982 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 983 asmlinkage long compat_sys_sigaction(int sig,
 984                                    const struct compat_old_sigaction __user *act,
 985                                    struct compat_old_sigaction __user *oact);
 986 #endif
 987
 988 /* obsolete: kernel/time/time.c */
 989 asmlinkage long compat_sys_stime(compat_time_t __user *tptr);
 990
 991 /* obsolete: net/socket.c */
 992 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 993
 994 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 995
 996
 997 /*
 998  * For most but not all architectures, "am I in a compat syscall?" and
 999  * "am I a compat task?" are the same question.  For architectures on which
1000  * they aren't the same question, arch code can override in_compat_syscall.
1001  */
1002
1003 #ifndef in_compat_syscall
1004 static inline bool in_compat_syscall(void) { return is_compat_task(); }
1005 #endif
1006
1007 /**
1008  * ns_to_compat_timeval - Compat version of ns_to_timeval
1009  * @nsec:       the nanoseconds value to be converted
1010  *
1011  * Returns the compat_timeval representation of the nsec parameter.
1012  */
1013 static inline struct compat_timeval ns_to_compat_timeval(s64 nsec)
1014 {
1015         struct timeval tv;
1016         struct compat_timeval ctv;
1017
1018         tv = ns_to_timeval(nsec);
1019         ctv.tv_sec = tv.tv_sec;
1020         ctv.tv_usec = tv.tv_usec;
1021
1022         return ctv;
1023 }
1024
1025 #else /* !CONFIG_COMPAT */
1026
1027 #define is_compat_task() (0)
1028 #ifndef in_compat_syscall
1029 static inline bool in_compat_syscall(void) { return false; }
1030 #endif
1031
1032 #endif /* CONFIG_COMPAT */
1033
1034 #endif /* _LINUX_COMPAT_H */