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
  11 #ifdef CONFIG_COMPAT
  12
  13 #include <linux/stat.h>
  14 #include <linux/param.h>        /* for HZ */
  15 #include <linux/sem.h>
  16 #include <linux/socket.h>
  17 #include <linux/if.h>
  18 #include <linux/fs.h>
  19 #include <linux/aio_abi.h>      /* for aio_context_t */
  20 #include <linux/unistd.h>
  21
  22 #include <asm/compat.h>
  23 #include <asm/siginfo.h>
  24 #include <asm/signal.h>
  25
  26 #ifndef COMPAT_USE_64BIT_TIME
  27 #define COMPAT_USE_64BIT_TIME 0
  28 #endif
  29
  30 #ifndef __SC_DELOUSE
  31 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
  32 #endif
  33
  34 #define COMPAT_SYSCALL_DEFINE0(name) \
  35         asmlinkage long compat_sys_##name(void)
  36
  37 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
  38         COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
  39 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
  40         COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
  41 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
  42         COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
  43 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
  44         COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
  45 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
  46         COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
  47 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
  48         COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
  49
  50 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)                            \
  51         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))\
  52                 __attribute__((alias(__stringify(compat_SyS##name))));  \
  53         static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  54         asmlinkage long compat_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__));\
  55         asmlinkage long compat_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__))\
  56         {                                                               \
  57                 return C_SYSC##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__)); \
  58         }                                                               \
  59         static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
  60
  61 #ifndef compat_user_stack_pointer
  62 #define compat_user_stack_pointer() current_user_stack_pointer()
  63 #endif
  64 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
  65 typedef struct compat_sigaltstack {
  66         compat_uptr_t                   ss_sp;
  67         int                             ss_flags;
  68         compat_size_t                   ss_size;
  69 } compat_stack_t;
  70 #endif
  71
  72 #define compat_jiffies_to_clock_t(x)    \
  73                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
  74
  75 typedef __compat_uid32_t        compat_uid_t;
  76 typedef __compat_gid32_t        compat_gid_t;
  77
  78 typedef compat_ulong_t          compat_aio_context_t;
  79
  80 struct compat_sel_arg_struct;
  81 struct rusage;
  82
  83 struct compat_itimerspec {
  84         struct compat_timespec it_interval;
  85         struct compat_timespec it_value;
  86 };
  87
  88 struct compat_utimbuf {
  89         compat_time_t           actime;
  90         compat_time_t           modtime;
  91 };
  92
  93 struct compat_itimerval {
  94         struct compat_timeval   it_interval;
  95         struct compat_timeval   it_value;
  96 };
  97
  98 struct itimerval;
  99 int get_compat_itimerval(struct itimerval *, const struct compat_itimerval __user *);
 100 int put_compat_itimerval(struct compat_itimerval __user *, const struct itimerval *);
 101
 102 struct compat_tms {
 103         compat_clock_t          tms_utime;
 104         compat_clock_t          tms_stime;
 105         compat_clock_t          tms_cutime;
 106         compat_clock_t          tms_cstime;
 107 };
 108
 109 struct compat_timex {
 110         compat_uint_t modes;
 111         compat_long_t offset;
 112         compat_long_t freq;
 113         compat_long_t maxerror;
 114         compat_long_t esterror;
 115         compat_int_t status;
 116         compat_long_t constant;
 117         compat_long_t precision;
 118         compat_long_t tolerance;
 119         struct compat_timeval time;
 120         compat_long_t tick;
 121         compat_long_t ppsfreq;
 122         compat_long_t jitter;
 123         compat_int_t shift;
 124         compat_long_t stabil;
 125         compat_long_t jitcnt;
 126         compat_long_t calcnt;
 127         compat_long_t errcnt;
 128         compat_long_t stbcnt;
 129         compat_int_t tai;
 130
 131         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
 132         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
 133         compat_int_t:32; compat_int_t:32; compat_int_t:32;
 134 };
 135
 136 struct timex;
 137 int compat_get_timex(struct timex *, const struct compat_timex __user *);
 138 int compat_put_timex(struct compat_timex __user *, const struct timex *);
 139
 140 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 141
 142 typedef struct {
 143         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 144 } compat_sigset_t;
 145
 146 struct compat_sigaction {
 147 #ifndef __ARCH_HAS_IRIX_SIGACTION
 148         compat_uptr_t                   sa_handler;
 149         compat_ulong_t                  sa_flags;
 150 #else
 151         compat_uint_t                   sa_flags;
 152         compat_uptr_t                   sa_handler;
 153 #endif
 154 #ifdef __ARCH_HAS_SA_RESTORER
 155         compat_uptr_t                   sa_restorer;
 156 #endif
 157         compat_sigset_t                 sa_mask __packed;
 158 };
 159
 160 typedef union compat_sigval {
 161         compat_int_t    sival_int;
 162         compat_uptr_t   sival_ptr;
 163 } compat_sigval_t;
 164
 165 typedef struct compat_siginfo {
 166         int si_signo;
 167 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
 168         int si_errno;
 169         int si_code;
 170 #else
 171         int si_code;
 172         int si_errno;
 173 #endif
 174
 175         union {
 176                 int _pad[128/sizeof(int) - 3];
 177
 178                 /* kill() */
 179                 struct {
 180                         compat_pid_t _pid;      /* sender's pid */
 181                         __compat_uid32_t _uid;  /* sender's uid */
 182                 } _kill;
 183
 184                 /* POSIX.1b timers */
 185                 struct {
 186                         compat_timer_t _tid;    /* timer id */
 187                         int _overrun;           /* overrun count */
 188                         compat_sigval_t _sigval;        /* same as below */
 189                 } _timer;
 190
 191                 /* POSIX.1b signals */
 192                 struct {
 193                         compat_pid_t _pid;      /* sender's pid */
 194                         __compat_uid32_t _uid;  /* sender's uid */
 195                         compat_sigval_t _sigval;
 196                 } _rt;
 197
 198                 /* SIGCHLD */
 199                 struct {
 200                         compat_pid_t _pid;      /* which child */
 201                         __compat_uid32_t _uid;  /* sender's uid */
 202                         int _status;            /* exit code */
 203                         compat_clock_t _utime;
 204                         compat_clock_t _stime;
 205                 } _sigchld;
 206
 207 #ifdef CONFIG_X86_X32_ABI
 208                 /* SIGCHLD (x32 version) */
 209                 struct {
 210                         compat_pid_t _pid;      /* which child */
 211                         __compat_uid32_t _uid;  /* sender's uid */
 212                         int _status;            /* exit code */
 213                         compat_s64 _utime;
 214                         compat_s64 _stime;
 215                 } _sigchld_x32;
 216 #endif
 217
 218                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 219                 struct {
 220                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
 221 #ifdef __ARCH_SI_TRAPNO
 222                         int _trapno;    /* TRAP # which caused the signal */
 223 #endif
 224                         union {
 225                                 /*
 226                                  * used when si_code=BUS_MCEERR_AR or
 227                                  * used when si_code=BUS_MCEERR_AO
 228                                  */
 229                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
 230                                 /* used when si_code=SEGV_BNDERR */
 231                                 struct {
 232                                         compat_uptr_t _dummy_bnd;
 233                                         compat_uptr_t _lower;
 234                                         compat_uptr_t _upper;
 235                                 } _addr_bnd;
 236                                 /* used when si_code=SEGV_PKUERR */
 237                                 struct {
 238                                         compat_uptr_t _dummy_pkey;
 239                                         u32 _pkey;
 240                                 } _addr_pkey;
 241                         };
 242                 } _sigfault;
 243
 244                 /* SIGPOLL */
 245                 struct {
 246                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 247                         int _fd;
 248                 } _sigpoll;
 249
 250                 struct {
 251                         compat_uptr_t _call_addr; /* calling user insn */
 252                         int _syscall;   /* triggering system call number */
 253                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 254                 } _sigsys;
 255         } _sifields;
 256 } compat_siginfo_t;
 257
 258 /*
 259  * These functions operate on 32- or 64-bit specs depending on
 260  * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments.
 261  */
 262 extern int compat_get_timespec(struct timespec *, const void __user *);
 263 extern int compat_put_timespec(const struct timespec *, void __user *);
 264 extern int compat_get_timeval(struct timeval *, const void __user *);
 265 extern int compat_put_timeval(const struct timeval *, void __user *);
 266 extern int compat_get_timespec64(struct timespec64 *, const void __user *);
 267 extern int compat_put_timespec64(const struct timespec64 *, void __user *);
 268 extern int get_compat_itimerspec64(struct itimerspec64 *its,
 269                         const struct compat_itimerspec __user *uits);
 270 extern int put_compat_itimerspec64(const struct itimerspec64 *its,
 271                         struct compat_itimerspec __user *uits);
 272
 273 struct compat_iovec {
 274         compat_uptr_t   iov_base;
 275         compat_size_t   iov_len;
 276 };
 277
 278 struct compat_rlimit {
 279         compat_ulong_t  rlim_cur;
 280         compat_ulong_t  rlim_max;
 281 };
 282
 283 struct compat_rusage {
 284         struct compat_timeval ru_utime;
 285         struct compat_timeval ru_stime;
 286         compat_long_t   ru_maxrss;
 287         compat_long_t   ru_ixrss;
 288         compat_long_t   ru_idrss;
 289         compat_long_t   ru_isrss;
 290         compat_long_t   ru_minflt;
 291         compat_long_t   ru_majflt;
 292         compat_long_t   ru_nswap;
 293         compat_long_t   ru_inblock;
 294         compat_long_t   ru_oublock;
 295         compat_long_t   ru_msgsnd;
 296         compat_long_t   ru_msgrcv;
 297         compat_long_t   ru_nsignals;
 298         compat_long_t   ru_nvcsw;
 299         compat_long_t   ru_nivcsw;
 300 };
 301
 302 extern int put_compat_rusage(const struct rusage *,
 303                              struct compat_rusage __user *);
 304
 305 struct compat_siginfo;
 306
 307 extern asmlinkage long compat_sys_waitid(int, compat_pid_t,
 308                 struct compat_siginfo __user *, int,
 309                 struct compat_rusage __user *);
 310
 311 struct compat_dirent {
 312         u32             d_ino;
 313         compat_off_t    d_off;
 314         u16             d_reclen;
 315         char            d_name[256];
 316 };
 317
 318 struct compat_ustat {
 319         compat_daddr_t          f_tfree;
 320         compat_ino_t            f_tinode;
 321         char                    f_fname[6];
 322         char                    f_fpack[6];
 323 };
 324
 325 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 326
 327 typedef struct compat_sigevent {
 328         compat_sigval_t sigev_value;
 329         compat_int_t sigev_signo;
 330         compat_int_t sigev_notify;
 331         union {
 332                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 333                 compat_int_t _tid;
 334
 335                 struct {
 336                         compat_uptr_t _function;
 337                         compat_uptr_t _attribute;
 338                 } _sigev_thread;
 339         } _sigev_un;
 340 } compat_sigevent_t;
 341
 342 struct compat_ifmap {
 343         compat_ulong_t mem_start;
 344         compat_ulong_t mem_end;
 345         unsigned short base_addr;
 346         unsigned char irq;
 347         unsigned char dma;
 348         unsigned char port;
 349 };
 350
 351 struct compat_if_settings {
 352         unsigned int type;      /* Type of physical device or protocol */
 353         unsigned int size;      /* Size of the data allocated by the caller */
 354         compat_uptr_t ifs_ifsu; /* union of pointers */
 355 };
 356
 357 struct compat_ifreq {
 358         union {
 359                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 360         } ifr_ifrn;
 361         union {
 362                 struct  sockaddr ifru_addr;
 363                 struct  sockaddr ifru_dstaddr;
 364                 struct  sockaddr ifru_broadaddr;
 365                 struct  sockaddr ifru_netmask;
 366                 struct  sockaddr ifru_hwaddr;
 367                 short   ifru_flags;
 368                 compat_int_t    ifru_ivalue;
 369                 compat_int_t    ifru_mtu;
 370                 struct  compat_ifmap ifru_map;
 371                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 372                 char    ifru_newname[IFNAMSIZ];
 373                 compat_caddr_t  ifru_data;
 374                 struct  compat_if_settings ifru_settings;
 375         } ifr_ifru;
 376 };
 377
 378 struct compat_ifconf {
 379         compat_int_t    ifc_len;                /* size of buffer */
 380         compat_caddr_t  ifcbuf;
 381 };
 382
 383 struct compat_robust_list {
 384         compat_uptr_t                   next;
 385 };
 386
 387 struct compat_robust_list_head {
 388         struct compat_robust_list       list;
 389         compat_long_t                   futex_offset;
 390         compat_uptr_t                   list_op_pending;
 391 };
 392
 393 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 394 struct compat_old_sigaction {
 395         compat_uptr_t                   sa_handler;
 396         compat_old_sigset_t             sa_mask;
 397         compat_ulong_t                  sa_flags;
 398         compat_uptr_t                   sa_restorer;
 399 };
 400 #endif
 401
 402 struct compat_keyctl_kdf_params {
 403         compat_uptr_t hashname;
 404         compat_uptr_t otherinfo;
 405         __u32 otherinfolen;
 406         __u32 __spare[8];
 407 };
 408
 409 struct compat_statfs;
 410 struct compat_statfs64;
 411 struct compat_old_linux_dirent;
 412 struct compat_linux_dirent;
 413 struct linux_dirent64;
 414 struct compat_msghdr;
 415 struct compat_mmsghdr;
 416 struct compat_sysinfo;
 417 struct compat_sysctl_args;
 418 struct compat_kexec_segment;
 419 struct compat_mq_attr;
 420 struct compat_msgbuf;
 421
 422 extern void compat_exit_robust_list(struct task_struct *curr);
 423
 424 asmlinkage long
 425 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 426                            compat_size_t len);
 427 asmlinkage long
 428 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 429                            compat_size_t __user *len_ptr);
 430
 431 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 432 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 433 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 434 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 435                 compat_ssize_t msgsz, int msgflg);
 436 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 437                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 438 long compat_sys_msgctl(int first, int second, void __user *uptr);
 439 long compat_sys_shmctl(int first, int second, void __user *uptr);
 440 long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 441                 unsigned nsems, const struct compat_timespec __user *timeout);
 442 asmlinkage long compat_sys_keyctl(u32 option,
 443                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 444 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 445
 446 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 447                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 448 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 449                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 450 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 451                 const struct compat_iovec __user *vec,
 452                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 453 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 454                 const struct compat_iovec __user *vec,
 455                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 456 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 457                 const struct compat_iovec __user *vec,
 458                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 459 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 460                 const struct compat_iovec __user *vec,
 461                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 462
 463 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 464 asmlinkage long compat_sys_preadv64(unsigned long fd,
 465                 const struct compat_iovec __user *vec,
 466                 unsigned long vlen, loff_t pos);
 467 #endif
 468
 469 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 470 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 471                 const struct compat_iovec __user *vec,
 472                 unsigned long vlen, loff_t pos);
 473 #endif
 474
 475 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 476 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 477                 const struct compat_iovec __user *vec,
 478                 unsigned long vlen, loff_t pos, rwf_t flags);
 479 #endif
 480
 481 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 482 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 483                 const struct compat_iovec __user *vec,
 484                 unsigned long vlen, loff_t pos, rwf_t flags);
 485 #endif
 486
 487 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 488
 489 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 490                      const compat_uptr_t __user *envp);
 491 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 492                      const compat_uptr_t __user *argv,
 493                      const compat_uptr_t __user *envp, int flags);
 494
 495 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 496                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 497                 struct compat_timeval __user *tvp);
 498
 499 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 500
 501 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 502                                  compat_uint_t __user *stat_addr, int options,
 503                                  struct compat_rusage __user *ru);
 504
 505 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 506
 507 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 508
 509 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 510                        unsigned long bitmap_size);
 511 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 512                        unsigned long bitmap_size);
 513 int copy_siginfo_from_user32(siginfo_t *to, const struct compat_siginfo __user *from);
 514 int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from);
 515 int get_compat_sigevent(struct sigevent *event,
 516                 const struct compat_sigevent __user *u_event);
 517 long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 518                                   struct compat_siginfo __user *uinfo);
 519 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 520 asmlinkage long compat_sys_sigaction(int sig,
 521                                    const struct compat_old_sigaction __user *act,
 522                                    struct compat_old_sigaction __user *oact);
 523 #endif
 524
 525 static inline int compat_timeval_compare(struct compat_timeval *lhs,
 526                                         struct compat_timeval *rhs)
 527 {
 528         if (lhs->tv_sec < rhs->tv_sec)
 529                 return -1;
 530         if (lhs->tv_sec > rhs->tv_sec)
 531                 return 1;
 532         return lhs->tv_usec - rhs->tv_usec;
 533 }
 534
 535 static inline int compat_timespec_compare(struct compat_timespec *lhs,
 536                                         struct compat_timespec *rhs)
 537 {
 538         if (lhs->tv_sec < rhs->tv_sec)
 539                 return -1;
 540         if (lhs->tv_sec > rhs->tv_sec)
 541                 return 1;
 542         return lhs->tv_nsec - rhs->tv_nsec;
 543 }
 544
 545 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 546                 struct timezone __user *tz);
 547 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 548                 struct timezone __user *tz);
 549
 550 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
 551
 552 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 553 extern int put_compat_sigset(compat_sigset_t __user *compat,
 554                              const sigset_t *set, unsigned int size);
 555
 556 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 557                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 558                 const compat_ulong_t __user *new_nodes);
 559
 560 extern int compat_ptrace_request(struct task_struct *child,
 561                                  compat_long_t request,
 562                                  compat_ulong_t addr, compat_ulong_t data);
 563
 564 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 565                                compat_ulong_t addr, compat_ulong_t data);
 566 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 567                                   compat_long_t addr, compat_long_t data);
 568
 569 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 570 /*
 571  * epoll (fs/eventpoll.c) compat bits follow ...
 572  */
 573 struct epoll_event;     /* fortunately, this one is fixed-layout */
 574 asmlinkage long compat_sys_epoll_pwait(int epfd,
 575                         struct epoll_event __user *events,
 576                         int maxevents, int timeout,
 577                         const compat_sigset_t __user *sigmask,
 578                         compat_size_t sigsetsize);
 579
 580 asmlinkage long compat_sys_utime(const char __user *filename,
 581                                  struct compat_utimbuf __user *t);
 582 asmlinkage long compat_sys_utimensat(unsigned int dfd,
 583                                      const char __user *filename,
 584                                      struct compat_timespec __user *t,
 585                                      int flags);
 586
 587 asmlinkage long compat_sys_time(compat_time_t __user *tloc);
 588 asmlinkage long compat_sys_stime(compat_time_t __user *tptr);
 589 asmlinkage long compat_sys_signalfd(int ufd,
 590                                     const compat_sigset_t __user *sigmask,
 591                                     compat_size_t sigsetsize);
 592 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
 593                                    const struct compat_itimerspec __user *utmr,
 594                                    struct compat_itimerspec __user *otmr);
 595 asmlinkage long compat_sys_timerfd_gettime(int ufd,
 596                                    struct compat_itimerspec __user *otmr);
 597
 598 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 599                                       __u32 __user *pages,
 600                                       const int __user *nodes,
 601                                       int __user *status,
 602                                       int flags);
 603 asmlinkage long compat_sys_futimesat(unsigned int dfd,
 604                                      const char __user *filename,
 605                                      struct compat_timeval __user *t);
 606 asmlinkage long compat_sys_utimes(const char __user *filename,
 607                                   struct compat_timeval __user *t);
 608 asmlinkage long compat_sys_newstat(const char __user *filename,
 609                                    struct compat_stat __user *statbuf);
 610 asmlinkage long compat_sys_newlstat(const char __user *filename,
 611                                     struct compat_stat __user *statbuf);
 612 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 613                                       const char __user *filename,
 614                                       struct compat_stat __user *statbuf,
 615                                       int flag);
 616 asmlinkage long compat_sys_newfstat(unsigned int fd,
 617                                     struct compat_stat __user *statbuf);
 618 asmlinkage long compat_sys_statfs(const char __user *pathname,
 619                                   struct compat_statfs __user *buf);
 620 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 621                                    struct compat_statfs __user *buf);
 622 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 623                                     compat_size_t sz,
 624                                     struct compat_statfs64 __user *buf);
 625 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 626                                      struct compat_statfs64 __user *buf);
 627 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 628                                    compat_ulong_t arg);
 629 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 630                                  compat_ulong_t arg);
 631 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 632 asmlinkage long compat_sys_io_getevents(compat_aio_context_t ctx_id,
 633                                         compat_long_t min_nr,
 634                                         compat_long_t nr,
 635                                         struct io_event __user *events,
 636                                         struct compat_timespec __user *timeout);
 637 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 638                                      u32 __user *iocb);
 639 asmlinkage long compat_sys_mount(const char __user *dev_name,
 640                                  const char __user *dir_name,
 641                                  const char __user *type, compat_ulong_t flags,
 642                                  const void __user *data);
 643 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 644                                        struct compat_old_linux_dirent __user *,
 645                                        unsigned int count);
 646 asmlinkage long compat_sys_getdents(unsigned int fd,
 647                                     struct compat_linux_dirent __user *dirent,
 648                                     unsigned int count);
 649 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 650                                     unsigned int nr_segs, unsigned int flags);
 651 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 652                                 umode_t mode);
 653 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 654                                   int flags, umode_t mode);
 655 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 656                                              struct file_handle __user *handle,
 657                                              int flags);
 658 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 659 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 660 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
 661                                     compat_ulong_t __user *outp,
 662                                     compat_ulong_t __user *exp,
 663                                     struct compat_timespec __user *tsp,
 664                                     void __user *sig);
 665 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
 666                                  unsigned int nfds,
 667                                  struct compat_timespec __user *tsp,
 668                                  const compat_sigset_t __user *sigmask,
 669                                  compat_size_t sigsetsize);
 670 asmlinkage long compat_sys_signalfd4(int ufd,
 671                                      const compat_sigset_t __user *sigmask,
 672                                      compat_size_t sigsetsize, int flags);
 673 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 674                                          compat_ulong_t __user *nmask,
 675                                          compat_ulong_t maxnode,
 676                                          compat_ulong_t addr,
 677                                          compat_ulong_t flags);
 678 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 679                                          compat_ulong_t maxnode);
 680 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 681                                  compat_ulong_t mode,
 682                                  compat_ulong_t __user *nmask,
 683                                  compat_ulong_t maxnode, compat_ulong_t flags);
 684
 685 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 686                                       char __user *optval, unsigned int optlen);
 687 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 688                                    unsigned flags);
 689 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 690                                     unsigned vlen, unsigned int flags);
 691 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 692                                    unsigned int flags);
 693 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 694                                 unsigned flags);
 695 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 696                             unsigned flags, struct sockaddr __user *addr,
 697                             int __user *addrlen);
 698 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 699                                     unsigned vlen, unsigned int flags,
 700                                     struct compat_timespec __user *timeout);
 701 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 702                                      struct compat_timespec __user *rmtp);
 703 asmlinkage long compat_sys_getitimer(int which,
 704                                      struct compat_itimerval __user *it);
 705 asmlinkage long compat_sys_setitimer(int which,
 706                                      struct compat_itimerval __user *in,
 707                                      struct compat_itimerval __user *out);
 708 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 709 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 710                                      struct compat_rlimit __user *rlim);
 711 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 712                                      struct compat_rlimit __user *rlim);
 713 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 714 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 715                                      unsigned int len,
 716                                      compat_ulong_t __user *user_mask_ptr);
 717 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 718                                      unsigned int len,
 719                                      compat_ulong_t __user *user_mask_ptr);
 720 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 721                         struct compat_sigevent __user *timer_event_spec,
 722                         timer_t __user *created_timer_id);
 723 asmlinkage long compat_sys_timer_settime(timer_t timer_id, int flags,
 724                                          struct compat_itimerspec __user *new,
 725                                          struct compat_itimerspec __user *old);
 726 asmlinkage long compat_sys_timer_gettime(timer_t timer_id,
 727                                  struct compat_itimerspec __user *setting);
 728 asmlinkage long compat_sys_clock_settime(clockid_t which_clock,
 729                                          struct compat_timespec __user *tp);
 730 asmlinkage long compat_sys_clock_gettime(clockid_t which_clock,
 731                                          struct compat_timespec __user *tp);
 732 asmlinkage long compat_sys_clock_adjtime(clockid_t which_clock,
 733                                          struct compat_timex __user *tp);
 734 asmlinkage long compat_sys_clock_getres(clockid_t which_clock,
 735                                         struct compat_timespec __user *tp);
 736 asmlinkage long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 737                                            struct compat_timespec __user *rqtp,
 738                                            struct compat_timespec __user *rmtp);
 739 asmlinkage long compat_sys_rt_sigtimedwait(compat_sigset_t __user *uthese,
 740                 struct compat_siginfo __user *uinfo,
 741                 struct compat_timespec __user *uts, compat_size_t sigsetsize);
 742 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 743                                          compat_size_t sigsetsize);
 744 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 745                                           compat_sigset_t __user *oset,
 746                                           compat_size_t sigsetsize);
 747 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 748                                          compat_size_t sigsetsize);
 749 #ifndef CONFIG_ODD_RT_SIGACTION
 750 asmlinkage long compat_sys_rt_sigaction(int,
 751                                  const struct compat_sigaction __user *,
 752                                  struct compat_sigaction __user *,
 753                                  compat_size_t);
 754 #endif
 755 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 756                                 struct compat_siginfo __user *uinfo);
 757 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 758 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 759                                  compat_ulong_t arg);
 760 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
 761                 struct compat_timespec __user *utime, u32 __user *uaddr2,
 762                 u32 val3);
 763 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 764                                       char __user *optval, int __user *optlen);
 765 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 766                                       compat_ulong_t nr_segments,
 767                                       struct compat_kexec_segment __user *,
 768                                       compat_ulong_t flags);
 769 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 770                         const struct compat_mq_attr __user *u_mqstat,
 771                         struct compat_mq_attr __user *u_omqstat);
 772 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 773                         const struct compat_sigevent __user *u_notification);
 774 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 775                         int oflag, compat_mode_t mode,
 776                         struct compat_mq_attr __user *u_attr);
 777 asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
 778                         const char __user *u_msg_ptr,
 779                         compat_size_t msg_len, unsigned int msg_prio,
 780                         const struct compat_timespec __user *u_abs_timeout);
 781 asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
 782                         char __user *u_msg_ptr,
 783                         compat_size_t msg_len, unsigned int __user *u_msg_prio,
 784                         const struct compat_timespec __user *u_abs_timeout);
 785 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 786 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
 787
 788 extern ssize_t compat_rw_copy_check_uvector(int type,
 789                 const struct compat_iovec __user *uvector,
 790                 unsigned long nr_segs,
 791                 unsigned long fast_segs, struct iovec *fast_pointer,
 792                 struct iovec **ret_pointer);
 793
 794 extern void __user *compat_alloc_user_space(unsigned long len);
 795
 796 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 797                 const struct compat_iovec __user *lvec,
 798                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 799                 compat_ulong_t riovcnt, compat_ulong_t flags);
 800 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 801                 const struct compat_iovec __user *lvec,
 802                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 803                 compat_ulong_t riovcnt, compat_ulong_t flags);
 804
 805 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 806                                     compat_off_t __user *offset, compat_size_t count);
 807 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 808                                     compat_loff_t __user *offset, compat_size_t count);
 809 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 810                                        compat_stack_t __user *uoss_ptr);
 811
 812 #ifdef __ARCH_WANT_SYS_SIGPENDING
 813 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 814 #endif
 815
 816 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 817 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 818                                        compat_old_sigset_t __user *oset);
 819 #endif
 820
 821 int compat_restore_altstack(const compat_stack_t __user *uss);
 822 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 823 #define compat_save_altstack_ex(uss, sp) do { \
 824         compat_stack_t __user *__uss = uss; \
 825         struct task_struct *t = current; \
 826         put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
 827         put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
 828         put_user_ex(t->sas_ss_size, &__uss->ss_size); \
 829         if (t->sas_ss_flags & SS_AUTODISARM) \
 830                 sas_ss_reset(t); \
 831 } while (0);
 832
 833 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
 834                                                  struct compat_timespec __user *interval);
 835
 836 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 837                                             int, const char __user *);
 838
 839 asmlinkage long compat_sys_arch_prctl(int option, unsigned long arg2);
 840
 841 /*
 842  * For most but not all architectures, "am I in a compat syscall?" and
 843  * "am I a compat task?" are the same question.  For architectures on which
 844  * they aren't the same question, arch code can override in_compat_syscall.
 845  */
 846
 847 #ifndef in_compat_syscall
 848 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 849 #endif
 850
 851 /**
 852  * ns_to_compat_timeval - Compat version of ns_to_timeval
 853  * @nsec:       the nanoseconds value to be converted
 854  *
 855  * Returns the compat_timeval representation of the nsec parameter.
 856  */
 857 static inline struct compat_timeval ns_to_compat_timeval(s64 nsec)
 858 {
 859         struct timeval tv;
 860         struct compat_timeval ctv;
 861
 862         tv = ns_to_timeval(nsec);
 863         ctv.tv_sec = tv.tv_sec;
 864         ctv.tv_usec = tv.tv_usec;
 865
 866         return ctv;
 867 }
 868
 869 #else /* !CONFIG_COMPAT */
 870
 871 #define is_compat_task() (0)
 872 static inline bool in_compat_syscall(void) { return false; }
 873
 874 #endif /* CONFIG_COMPAT */
 875
 876 #endif /* _LINUX_COMPAT_H */