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/uaccess.h>
  21 #include <linux/unistd.h>
  22
  23 #include <asm/compat.h>
  24 #include <asm/siginfo.h>
  25 #include <asm/signal.h>
  26
  27 #ifndef COMPAT_USE_64BIT_TIME
  28 #define COMPAT_USE_64BIT_TIME 0
  29 #endif
  30
  31 #ifndef __SC_DELOUSE
  32 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
  33 #endif
  34
  35 #define COMPAT_SYSCALL_DEFINE0(name) \
  36         asmlinkage long compat_sys_##name(void); \
  37         ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
  38         asmlinkage long compat_sys_##name(void)
  39
  40 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
  41         COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
  42 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
  43         COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
  44 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
  45         COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
  46 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
  47         COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
  48 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
  49         COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
  50 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
  51         COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
  52
  53 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)                            \
  54         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  55         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))\
  56                 __attribute__((alias(__stringify(compat_SyS##name))));  \
  57         ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO); \
  58         static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  59         asmlinkage long compat_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__));\
  60         asmlinkage long compat_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__))\
  61         {                                                               \
  62                 return C_SYSC##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__)); \
  63         }                                                               \
  64         static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
  65
  66 #ifndef compat_user_stack_pointer
  67 #define compat_user_stack_pointer() current_user_stack_pointer()
  68 #endif
  69 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
  70 typedef struct compat_sigaltstack {
  71         compat_uptr_t                   ss_sp;
  72         int                             ss_flags;
  73         compat_size_t                   ss_size;
  74 } compat_stack_t;
  75 #endif
  76
  77 #define compat_jiffies_to_clock_t(x)    \
  78                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
  79
  80 typedef __compat_uid32_t        compat_uid_t;
  81 typedef __compat_gid32_t        compat_gid_t;
  82
  83 typedef compat_ulong_t          compat_aio_context_t;
  84
  85 struct compat_sel_arg_struct;
  86 struct rusage;
  87
  88 struct compat_itimerspec {
  89         struct compat_timespec it_interval;
  90         struct compat_timespec it_value;
  91 };
  92
  93 struct compat_utimbuf {
  94         compat_time_t           actime;
  95         compat_time_t           modtime;
  96 };
  97
  98 struct compat_itimerval {
  99         struct compat_timeval   it_interval;
 100         struct compat_timeval   it_value;
 101 };
 102
 103 struct itimerval;
 104 int get_compat_itimerval(struct itimerval *, const struct compat_itimerval __user *);
 105 int put_compat_itimerval(struct compat_itimerval __user *, const struct itimerval *);
 106
 107 struct compat_tms {
 108         compat_clock_t          tms_utime;
 109         compat_clock_t          tms_stime;
 110         compat_clock_t          tms_cutime;
 111         compat_clock_t          tms_cstime;
 112 };
 113
 114 struct compat_timex {
 115         compat_uint_t modes;
 116         compat_long_t offset;
 117         compat_long_t freq;
 118         compat_long_t maxerror;
 119         compat_long_t esterror;
 120         compat_int_t status;
 121         compat_long_t constant;
 122         compat_long_t precision;
 123         compat_long_t tolerance;
 124         struct compat_timeval time;
 125         compat_long_t tick;
 126         compat_long_t ppsfreq;
 127         compat_long_t jitter;
 128         compat_int_t shift;
 129         compat_long_t stabil;
 130         compat_long_t jitcnt;
 131         compat_long_t calcnt;
 132         compat_long_t errcnt;
 133         compat_long_t stbcnt;
 134         compat_int_t tai;
 135
 136         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
 137         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
 138         compat_int_t:32; compat_int_t:32; compat_int_t:32;
 139 };
 140
 141 struct timex;
 142 int compat_get_timex(struct timex *, const struct compat_timex __user *);
 143 int compat_put_timex(struct compat_timex __user *, const struct timex *);
 144
 145 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 146
 147 typedef struct {
 148         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 149 } compat_sigset_t;
 150
 151 struct compat_sigaction {
 152 #ifndef __ARCH_HAS_IRIX_SIGACTION
 153         compat_uptr_t                   sa_handler;
 154         compat_ulong_t                  sa_flags;
 155 #else
 156         compat_uint_t                   sa_flags;
 157         compat_uptr_t                   sa_handler;
 158 #endif
 159 #ifdef __ARCH_HAS_SA_RESTORER
 160         compat_uptr_t                   sa_restorer;
 161 #endif
 162         compat_sigset_t                 sa_mask __packed;
 163 };
 164
 165 typedef union compat_sigval {
 166         compat_int_t    sival_int;
 167         compat_uptr_t   sival_ptr;
 168 } compat_sigval_t;
 169
 170 typedef struct compat_siginfo {
 171         int si_signo;
 172 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
 173         int si_errno;
 174         int si_code;
 175 #else
 176         int si_code;
 177         int si_errno;
 178 #endif
 179
 180         union {
 181                 int _pad[128/sizeof(int) - 3];
 182
 183                 /* kill() */
 184                 struct {
 185                         compat_pid_t _pid;      /* sender's pid */
 186                         __compat_uid32_t _uid;  /* sender's uid */
 187                 } _kill;
 188
 189                 /* POSIX.1b timers */
 190                 struct {
 191                         compat_timer_t _tid;    /* timer id */
 192                         int _overrun;           /* overrun count */
 193                         compat_sigval_t _sigval;        /* same as below */
 194                 } _timer;
 195
 196                 /* POSIX.1b signals */
 197                 struct {
 198                         compat_pid_t _pid;      /* sender's pid */
 199                         __compat_uid32_t _uid;  /* sender's uid */
 200                         compat_sigval_t _sigval;
 201                 } _rt;
 202
 203                 /* SIGCHLD */
 204                 struct {
 205                         compat_pid_t _pid;      /* which child */
 206                         __compat_uid32_t _uid;  /* sender's uid */
 207                         int _status;            /* exit code */
 208                         compat_clock_t _utime;
 209                         compat_clock_t _stime;
 210                 } _sigchld;
 211
 212 #ifdef CONFIG_X86_X32_ABI
 213                 /* SIGCHLD (x32 version) */
 214                 struct {
 215                         compat_pid_t _pid;      /* which child */
 216                         __compat_uid32_t _uid;  /* sender's uid */
 217                         int _status;            /* exit code */
 218                         compat_s64 _utime;
 219                         compat_s64 _stime;
 220                 } _sigchld_x32;
 221 #endif
 222
 223                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 224                 struct {
 225                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
 226 #ifdef __ARCH_SI_TRAPNO
 227                         int _trapno;    /* TRAP # which caused the signal */
 228 #endif
 229                         union {
 230                                 /*
 231                                  * used when si_code=BUS_MCEERR_AR or
 232                                  * used when si_code=BUS_MCEERR_AO
 233                                  */
 234                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
 235                                 /* used when si_code=SEGV_BNDERR */
 236                                 struct {
 237                                         compat_uptr_t _dummy_bnd;
 238                                         compat_uptr_t _lower;
 239                                         compat_uptr_t _upper;
 240                                 } _addr_bnd;
 241                                 /* used when si_code=SEGV_PKUERR */
 242                                 struct {
 243                                         compat_uptr_t _dummy_pkey;
 244                                         u32 _pkey;
 245                                 } _addr_pkey;
 246                         };
 247                 } _sigfault;
 248
 249                 /* SIGPOLL */
 250                 struct {
 251                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 252                         int _fd;
 253                 } _sigpoll;
 254
 255                 struct {
 256                         compat_uptr_t _call_addr; /* calling user insn */
 257                         int _syscall;   /* triggering system call number */
 258                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 259                 } _sigsys;
 260         } _sifields;
 261 } compat_siginfo_t;
 262
 263 /*
 264  * These functions operate on 32- or 64-bit specs depending on
 265  * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments.
 266  */
 267 extern int compat_get_timespec(struct timespec *, const void __user *);
 268 extern int compat_put_timespec(const struct timespec *, void __user *);
 269 extern int compat_get_timeval(struct timeval *, const void __user *);
 270 extern int compat_put_timeval(const struct timeval *, void __user *);
 271 extern int compat_get_timespec64(struct timespec64 *, const void __user *);
 272 extern int compat_put_timespec64(const struct timespec64 *, void __user *);
 273 extern int get_compat_itimerspec64(struct itimerspec64 *its,
 274                         const struct compat_itimerspec __user *uits);
 275 extern int put_compat_itimerspec64(const struct itimerspec64 *its,
 276                         struct compat_itimerspec __user *uits);
 277
 278 struct compat_iovec {
 279         compat_uptr_t   iov_base;
 280         compat_size_t   iov_len;
 281 };
 282
 283 struct compat_rlimit {
 284         compat_ulong_t  rlim_cur;
 285         compat_ulong_t  rlim_max;
 286 };
 287
 288 struct compat_rusage {
 289         struct compat_timeval ru_utime;
 290         struct compat_timeval ru_stime;
 291         compat_long_t   ru_maxrss;
 292         compat_long_t   ru_ixrss;
 293         compat_long_t   ru_idrss;
 294         compat_long_t   ru_isrss;
 295         compat_long_t   ru_minflt;
 296         compat_long_t   ru_majflt;
 297         compat_long_t   ru_nswap;
 298         compat_long_t   ru_inblock;
 299         compat_long_t   ru_oublock;
 300         compat_long_t   ru_msgsnd;
 301         compat_long_t   ru_msgrcv;
 302         compat_long_t   ru_nsignals;
 303         compat_long_t   ru_nvcsw;
 304         compat_long_t   ru_nivcsw;
 305 };
 306
 307 extern int put_compat_rusage(const struct rusage *,
 308                              struct compat_rusage __user *);
 309
 310 struct compat_siginfo;
 311
 312 struct compat_dirent {
 313         u32             d_ino;
 314         compat_off_t    d_off;
 315         u16             d_reclen;
 316         char            d_name[256];
 317 };
 318
 319 struct compat_ustat {
 320         compat_daddr_t          f_tfree;
 321         compat_ino_t            f_tinode;
 322         char                    f_fname[6];
 323         char                    f_fpack[6];
 324 };
 325
 326 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 327
 328 typedef struct compat_sigevent {
 329         compat_sigval_t sigev_value;
 330         compat_int_t sigev_signo;
 331         compat_int_t sigev_notify;
 332         union {
 333                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 334                 compat_int_t _tid;
 335
 336                 struct {
 337                         compat_uptr_t _function;
 338                         compat_uptr_t _attribute;
 339                 } _sigev_thread;
 340         } _sigev_un;
 341 } compat_sigevent_t;
 342
 343 struct compat_ifmap {
 344         compat_ulong_t mem_start;
 345         compat_ulong_t mem_end;
 346         unsigned short base_addr;
 347         unsigned char irq;
 348         unsigned char dma;
 349         unsigned char port;
 350 };
 351
 352 struct compat_if_settings {
 353         unsigned int type;      /* Type of physical device or protocol */
 354         unsigned int size;      /* Size of the data allocated by the caller */
 355         compat_uptr_t ifs_ifsu; /* union of pointers */
 356 };
 357
 358 struct compat_ifreq {
 359         union {
 360                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 361         } ifr_ifrn;
 362         union {
 363                 struct  sockaddr ifru_addr;
 364                 struct  sockaddr ifru_dstaddr;
 365                 struct  sockaddr ifru_broadaddr;
 366                 struct  sockaddr ifru_netmask;
 367                 struct  sockaddr ifru_hwaddr;
 368                 short   ifru_flags;
 369                 compat_int_t    ifru_ivalue;
 370                 compat_int_t    ifru_mtu;
 371                 struct  compat_ifmap ifru_map;
 372                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 373                 char    ifru_newname[IFNAMSIZ];
 374                 compat_caddr_t  ifru_data;
 375                 struct  compat_if_settings ifru_settings;
 376         } ifr_ifru;
 377 };
 378
 379 struct compat_ifconf {
 380         compat_int_t    ifc_len;                /* size of buffer */
 381         compat_caddr_t  ifcbuf;
 382 };
 383
 384 struct compat_robust_list {
 385         compat_uptr_t                   next;
 386 };
 387
 388 struct compat_robust_list_head {
 389         struct compat_robust_list       list;
 390         compat_long_t                   futex_offset;
 391         compat_uptr_t                   list_op_pending;
 392 };
 393
 394 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 395 struct compat_old_sigaction {
 396         compat_uptr_t                   sa_handler;
 397         compat_old_sigset_t             sa_mask;
 398         compat_ulong_t                  sa_flags;
 399         compat_uptr_t                   sa_restorer;
 400 };
 401 #endif
 402
 403 struct compat_keyctl_kdf_params {
 404         compat_uptr_t hashname;
 405         compat_uptr_t otherinfo;
 406         __u32 otherinfolen;
 407         __u32 __spare[8];
 408 };
 409
 410 struct compat_statfs;
 411 struct compat_statfs64;
 412 struct compat_old_linux_dirent;
 413 struct compat_linux_dirent;
 414 struct linux_dirent64;
 415 struct compat_msghdr;
 416 struct compat_mmsghdr;
 417 struct compat_sysinfo;
 418 struct compat_sysctl_args;
 419 struct compat_kexec_segment;
 420 struct compat_mq_attr;
 421 struct compat_msgbuf;
 422
 423 extern void compat_exit_robust_list(struct task_struct *curr);
 424
 425 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 426
 427 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 428
 429 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 430                        unsigned long bitmap_size);
 431 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 432                        unsigned long bitmap_size);
 433 int copy_siginfo_from_user32(siginfo_t *to, const struct compat_siginfo __user *from);
 434 int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from);
 435 int get_compat_sigevent(struct sigevent *event,
 436                 const struct compat_sigevent __user *u_event);
 437
 438 static inline int compat_timeval_compare(struct compat_timeval *lhs,
 439                                         struct compat_timeval *rhs)
 440 {
 441         if (lhs->tv_sec < rhs->tv_sec)
 442                 return -1;
 443         if (lhs->tv_sec > rhs->tv_sec)
 444                 return 1;
 445         return lhs->tv_usec - rhs->tv_usec;
 446 }
 447
 448 static inline int compat_timespec_compare(struct compat_timespec *lhs,
 449                                         struct compat_timespec *rhs)
 450 {
 451         if (lhs->tv_sec < rhs->tv_sec)
 452                 return -1;
 453         if (lhs->tv_sec > rhs->tv_sec)
 454                 return 1;
 455         return lhs->tv_nsec - rhs->tv_nsec;
 456 }
 457
 458 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 459
 460 /*
 461  * Defined inline such that size can be compile time constant, which avoids
 462  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 463  */
 464 static inline int
 465 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 466                   unsigned int size)
 467 {
 468         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 469 #ifdef __BIG_ENDIAN
 470         compat_sigset_t v;
 471         switch (_NSIG_WORDS) {
 472         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 473         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 474         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 475         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 476         }
 477         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 478 #else
 479         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 480 #endif
 481 }
 482
 483 extern int compat_ptrace_request(struct task_struct *child,
 484                                  compat_long_t request,
 485                                  compat_ulong_t addr, compat_ulong_t data);
 486
 487 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 488                                compat_ulong_t addr, compat_ulong_t data);
 489
 490 struct epoll_event;     /* fortunately, this one is fixed-layout */
 491
 492 extern ssize_t compat_rw_copy_check_uvector(int type,
 493                 const struct compat_iovec __user *uvector,
 494                 unsigned long nr_segs,
 495                 unsigned long fast_segs, struct iovec *fast_pointer,
 496                 struct iovec **ret_pointer);
 497
 498 extern void __user *compat_alloc_user_space(unsigned long len);
 499
 500 int compat_restore_altstack(const compat_stack_t __user *uss);
 501 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 502 #define compat_save_altstack_ex(uss, sp) do { \
 503         compat_stack_t __user *__uss = uss; \
 504         struct task_struct *t = current; \
 505         put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
 506         put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
 507         put_user_ex(t->sas_ss_size, &__uss->ss_size); \
 508         if (t->sas_ss_flags & SS_AUTODISARM) \
 509                 sas_ss_reset(t); \
 510 } while (0);
 511
 512 /*
 513  * These syscall function prototypes are kept in the same order as
 514  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 515  * go below.
 516  *
 517  * Please note that these prototypes here are only provided for information
 518  * purposes, for static analysis, and for linking from the syscall table.
 519  * These functions should not be called elsewhere from kernel code.
 520  */
 521 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 522 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 523                                      u32 __user *iocb);
 524 asmlinkage long compat_sys_io_getevents(compat_aio_context_t ctx_id,
 525                                         compat_long_t min_nr,
 526                                         compat_long_t nr,
 527                                         struct io_event __user *events,
 528                                         struct compat_timespec __user *timeout);
 529
 530 /* fs/cookies.c */
 531 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 532
 533 /* fs/eventpoll.c */
 534 asmlinkage long compat_sys_epoll_pwait(int epfd,
 535                         struct epoll_event __user *events,
 536                         int maxevents, int timeout,
 537                         const compat_sigset_t __user *sigmask,
 538                         compat_size_t sigsetsize);
 539
 540 /* fs/fcntl.c */
 541 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 542                                  compat_ulong_t arg);
 543 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 544                                    compat_ulong_t arg);
 545
 546 /* fs/ioctl.c */
 547 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 548                                  compat_ulong_t arg);
 549
 550 /* fs/namespace.c */
 551 asmlinkage long compat_sys_mount(const char __user *dev_name,
 552                                  const char __user *dir_name,
 553                                  const char __user *type, compat_ulong_t flags,
 554                                  const void __user *data);
 555
 556 /* fs/open.c */
 557 asmlinkage long compat_sys_statfs(const char __user *pathname,
 558                                   struct compat_statfs __user *buf);
 559 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 560                                     compat_size_t sz,
 561                                     struct compat_statfs64 __user *buf);
 562 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 563                                    struct compat_statfs __user *buf);
 564 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 565                                      struct compat_statfs64 __user *buf);
 566 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 567 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 568 /* No generic prototype for truncate64, ftruncate64, fallocate */
 569 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 570                                   int flags, umode_t mode);
 571
 572 /* fs/readdir.c */
 573 asmlinkage long compat_sys_getdents(unsigned int fd,
 574                                     struct compat_linux_dirent __user *dirent,
 575                                     unsigned int count);
 576
 577 /* fs/read_write.c */
 578 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 579 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 580                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 581 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 582                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 583 /* No generic prototype for pread64 and pwrite64 */
 584 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 585                 const struct compat_iovec __user *vec,
 586                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 587 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 588                 const struct compat_iovec __user *vec,
 589                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 590 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 591 asmlinkage long compat_sys_preadv64(unsigned long fd,
 592                 const struct compat_iovec __user *vec,
 593                 unsigned long vlen, loff_t pos);
 594 #endif
 595
 596 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 597 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 598                 const struct compat_iovec __user *vec,
 599                 unsigned long vlen, loff_t pos);
 600 #endif
 601
 602 /* fs/sendfile.c */
 603 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 604                                     compat_off_t __user *offset, compat_size_t count);
 605 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 606                                     compat_loff_t __user *offset, compat_size_t count);
 607
 608 /* fs/select.c */
 609 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
 610                                     compat_ulong_t __user *outp,
 611                                     compat_ulong_t __user *exp,
 612                                     struct compat_timespec __user *tsp,
 613                                     void __user *sig);
 614 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
 615                                  unsigned int nfds,
 616                                  struct compat_timespec __user *tsp,
 617                                  const compat_sigset_t __user *sigmask,
 618                                  compat_size_t sigsetsize);
 619
 620 /* fs/signalfd.c */
 621 asmlinkage long compat_sys_signalfd4(int ufd,
 622                                      const compat_sigset_t __user *sigmask,
 623                                      compat_size_t sigsetsize, int flags);
 624
 625 /* fs/splice.c */
 626 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 627                                     unsigned int nr_segs, unsigned int flags);
 628
 629 /* fs/stat.c */
 630 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 631                                       const char __user *filename,
 632                                       struct compat_stat __user *statbuf,
 633                                       int flag);
 634 asmlinkage long compat_sys_newfstat(unsigned int fd,
 635                                     struct compat_stat __user *statbuf);
 636
 637 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 638
 639 /* fs/timerfd.c */
 640 asmlinkage long compat_sys_timerfd_gettime(int ufd,
 641                                    struct compat_itimerspec __user *otmr);
 642 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
 643                                    const struct compat_itimerspec __user *utmr,
 644                                    struct compat_itimerspec __user *otmr);
 645
 646 /* fs/utimes.c */
 647 asmlinkage long compat_sys_utimensat(unsigned int dfd,
 648                                      const char __user *filename,
 649                                      struct compat_timespec __user *t,
 650                                      int flags);
 651
 652 /* kernel/exit.c */
 653 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 654                 struct compat_siginfo __user *, int,
 655                 struct compat_rusage __user *);
 656
 657
 658
 659 /* kernel/futex.c */
 660 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
 661                 struct compat_timespec __user *utime, u32 __user *uaddr2,
 662                 u32 val3);
 663 asmlinkage long
 664 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 665                            compat_size_t len);
 666 asmlinkage long
 667 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 668                            compat_size_t __user *len_ptr);
 669
 670 /* kernel/hrtimer.c */
 671 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 672                                      struct compat_timespec __user *rmtp);
 673
 674 /* kernel/itimer.c */
 675 asmlinkage long compat_sys_getitimer(int which,
 676                                      struct compat_itimerval __user *it);
 677 asmlinkage long compat_sys_setitimer(int which,
 678                                      struct compat_itimerval __user *in,
 679                                      struct compat_itimerval __user *out);
 680
 681 /* kernel/kexec.c */
 682 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 683                                       compat_ulong_t nr_segments,
 684                                       struct compat_kexec_segment __user *,
 685                                       compat_ulong_t flags);
 686
 687 /* kernel/posix-timers.c */
 688 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 689                         struct compat_sigevent __user *timer_event_spec,
 690                         timer_t __user *created_timer_id);
 691 asmlinkage long compat_sys_timer_gettime(timer_t timer_id,
 692                                  struct compat_itimerspec __user *setting);
 693 asmlinkage long compat_sys_timer_settime(timer_t timer_id, int flags,
 694                                          struct compat_itimerspec __user *new,
 695                                          struct compat_itimerspec __user *old);
 696 asmlinkage long compat_sys_clock_settime(clockid_t which_clock,
 697                                          struct compat_timespec __user *tp);
 698 asmlinkage long compat_sys_clock_gettime(clockid_t which_clock,
 699                                          struct compat_timespec __user *tp);
 700 asmlinkage long compat_sys_clock_getres(clockid_t which_clock,
 701                                         struct compat_timespec __user *tp);
 702 asmlinkage long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 703                                            struct compat_timespec __user *rqtp,
 704                                            struct compat_timespec __user *rmtp);
 705
 706 /* kernel/ptrace.c */
 707 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 708                                   compat_long_t addr, compat_long_t data);
 709
 710 /* kernel/sched/core.c */
 711 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 712                                      unsigned int len,
 713                                      compat_ulong_t __user *user_mask_ptr);
 714 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 715                                      unsigned int len,
 716                                      compat_ulong_t __user *user_mask_ptr);
 717 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
 718                                                  struct compat_timespec __user *interval);
 719
 720 /* kernel/signal.c */
 721 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 722                                        compat_stack_t __user *uoss_ptr);
 723 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 724                                          compat_size_t sigsetsize);
 725 #ifndef CONFIG_ODD_RT_SIGACTION
 726 asmlinkage long compat_sys_rt_sigaction(int,
 727                                  const struct compat_sigaction __user *,
 728                                  struct compat_sigaction __user *,
 729                                  compat_size_t);
 730 #endif
 731 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 732                                           compat_sigset_t __user *oset,
 733                                           compat_size_t sigsetsize);
 734 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 735                                          compat_size_t sigsetsize);
 736 asmlinkage long compat_sys_rt_sigtimedwait(compat_sigset_t __user *uthese,
 737                 struct compat_siginfo __user *uinfo,
 738                 struct compat_timespec __user *uts, compat_size_t sigsetsize);
 739 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 740                                 struct compat_siginfo __user *uinfo);
 741 /* No generic prototype for rt_sigreturn */
 742
 743 /* kernel/sys.c */
 744 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 745 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 746                                      struct compat_rlimit __user *rlim);
 747 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 748                                      struct compat_rlimit __user *rlim);
 749 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 750
 751 /* kernel/time.c */
 752 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 753                 struct timezone __user *tz);
 754 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 755                 struct timezone __user *tz);
 756 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
 757
 758 /* kernel/timer.c */
 759 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 760
 761 /* ipc/mqueue.c */
 762 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 763                         int oflag, compat_mode_t mode,
 764                         struct compat_mq_attr __user *u_attr);
 765 asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
 766                         const char __user *u_msg_ptr,
 767                         compat_size_t msg_len, unsigned int msg_prio,
 768                         const struct compat_timespec __user *u_abs_timeout);
 769 asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
 770                         char __user *u_msg_ptr,
 771                         compat_size_t msg_len, unsigned int __user *u_msg_prio,
 772                         const struct compat_timespec __user *u_abs_timeout);
 773 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 774                         const struct compat_sigevent __user *u_notification);
 775 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 776                         const struct compat_mq_attr __user *u_mqstat,
 777                         struct compat_mq_attr __user *u_omqstat);
 778
 779 /* ipc/msg.c */
 780 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 781 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 782                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 783 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 784                 compat_ssize_t msgsz, int msgflg);
 785
 786 /* ipc/sem.c */
 787 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 788 asmlinkage long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 789                 unsigned nsems, const struct compat_timespec __user *timeout);
 790
 791 /* ipc/shm.c */
 792 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 793 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 794
 795 /* net/socket.c */
 796 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 797                             unsigned flags, struct sockaddr __user *addr,
 798                             int __user *addrlen);
 799 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 800                                       char __user *optval, unsigned int optlen);
 801 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 802                                       char __user *optval, int __user *optlen);
 803 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 804                                    unsigned flags);
 805 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 806                                    unsigned int flags);
 807
 808 /* mm/filemap.c: No generic prototype for readahead */
 809
 810 /* security/keys/keyctl.c */
 811 asmlinkage long compat_sys_keyctl(u32 option,
 812                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 813
 814 /* arch/example/kernel/sys_example.c */
 815 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 816                      const compat_uptr_t __user *envp);
 817
 818 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 819
 820 /* mm/, CONFIG_MMU only */
 821 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 822                                  compat_ulong_t mode,
 823                                  compat_ulong_t __user *nmask,
 824                                  compat_ulong_t maxnode, compat_ulong_t flags);
 825 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 826                                          compat_ulong_t __user *nmask,
 827                                          compat_ulong_t maxnode,
 828                                          compat_ulong_t addr,
 829                                          compat_ulong_t flags);
 830 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 831                                          compat_ulong_t maxnode);
 832 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 833                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 834                 const compat_ulong_t __user *new_nodes);
 835 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 836                                       __u32 __user *pages,
 837                                       const int __user *nodes,
 838                                       int __user *status,
 839                                       int flags);
 840
 841 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 842                                         compat_pid_t pid, int sig,
 843                                         struct compat_siginfo __user *uinfo);
 844 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 845                                     unsigned vlen, unsigned int flags,
 846                                     struct compat_timespec __user *timeout);
 847 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 848                                  compat_uint_t __user *stat_addr, int options,
 849                                  struct compat_rusage __user *ru);
 850 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 851                                             int, const char __user *);
 852 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 853                                              struct file_handle __user *handle,
 854                                              int flags);
 855 asmlinkage long compat_sys_clock_adjtime(clockid_t which_clock,
 856                                          struct compat_timex __user *tp);
 857 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 858                                     unsigned vlen, unsigned int flags);
 859 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 860                 const struct compat_iovec __user *lvec,
 861                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 862                 compat_ulong_t riovcnt, compat_ulong_t flags);
 863 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 864                 const struct compat_iovec __user *lvec,
 865                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 866                 compat_ulong_t riovcnt, compat_ulong_t flags);
 867 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 868                      const compat_uptr_t __user *argv,
 869                      const compat_uptr_t __user *envp, int flags);
 870 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 871                 const struct compat_iovec __user *vec,
 872                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 873 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 874                 const struct compat_iovec __user *vec,
 875                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 876 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 877 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 878                 const struct compat_iovec __user *vec,
 879                 unsigned long vlen, loff_t pos, rwf_t flags);
 880 #endif
 881
 882 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 883 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 884                 const struct compat_iovec __user *vec,
 885                 unsigned long vlen, loff_t pos, rwf_t flags);
 886 #endif
 887
 888
 889 /*
 890  * Deprecated system calls which are still defined in
 891  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 892  */
 893
 894 /* __ARCH_WANT_SYSCALL_NO_AT */
 895 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 896                                 umode_t mode);
 897 asmlinkage long compat_sys_utimes(const char __user *filename,
 898                                   struct compat_timeval __user *t);
 899
 900 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 901 asmlinkage long compat_sys_signalfd(int ufd,
 902                                     const compat_sigset_t __user *sigmask,
 903                                     compat_size_t sigsetsize);
 904
 905 /* __ARCH_WANT_SYSCALL_OFF_T */
 906 asmlinkage long compat_sys_newstat(const char __user *filename,
 907                                    struct compat_stat __user *statbuf);
 908 asmlinkage long compat_sys_newlstat(const char __user *filename,
 909                                     struct compat_stat __user *statbuf);
 910
 911 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 912 asmlinkage long compat_sys_time(compat_time_t __user *tloc);
 913 asmlinkage long compat_sys_utime(const char __user *filename,
 914                                  struct compat_utimbuf __user *t);
 915 asmlinkage long compat_sys_futimesat(unsigned int dfd,
 916                                      const char __user *filename,
 917                                      struct compat_timeval __user *t);
 918 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 919                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 920                 struct compat_timeval __user *tvp);
 921 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 922 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 923                                 unsigned flags);
 924 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
 925
 926 /* obsolete: fs/readdir.c */
 927 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 928                                        struct compat_old_linux_dirent __user *,
 929                                        unsigned int count);
 930
 931 /* obsolete: fs/select.c */
 932 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 933
 934 /* obsolete: ipc */
 935 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 936
 937 /* obsolete: kernel/signal.c */
 938 #ifdef __ARCH_WANT_SYS_SIGPENDING
 939 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 940 #endif
 941
 942 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 943 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 944                                        compat_old_sigset_t __user *oset);
 945 #endif
 946 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 947 asmlinkage long compat_sys_sigaction(int sig,
 948                                    const struct compat_old_sigaction __user *act,
 949                                    struct compat_old_sigaction __user *oact);
 950 #endif
 951
 952 /* obsolete: kernel/time/time.c */
 953 asmlinkage long compat_sys_stime(compat_time_t __user *tptr);
 954
 955 /* obsolete: net/socket.c */
 956 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 957
 958
 959 /*
 960  * For most but not all architectures, "am I in a compat syscall?" and
 961  * "am I a compat task?" are the same question.  For architectures on which
 962  * they aren't the same question, arch code can override in_compat_syscall.
 963  */
 964
 965 #ifndef in_compat_syscall
 966 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 967 #endif
 968
 969 /**
 970  * ns_to_compat_timeval - Compat version of ns_to_timeval
 971  * @nsec:       the nanoseconds value to be converted
 972  *
 973  * Returns the compat_timeval representation of the nsec parameter.
 974  */
 975 static inline struct compat_timeval ns_to_compat_timeval(s64 nsec)
 976 {
 977         struct timeval tv;
 978         struct compat_timeval ctv;
 979
 980         tv = ns_to_timeval(nsec);
 981         ctv.tv_sec = tv.tv_sec;
 982         ctv.tv_usec = tv.tv_usec;
 983
 984         return ctv;
 985 }
 986
 987 #else /* !CONFIG_COMPAT */
 988
 989 #define is_compat_task() (0)
 990 static inline bool in_compat_syscall(void) { return false; }
 991
 992 #endif /* CONFIG_COMPAT */
 993
 994 #endif /* _LINUX_COMPAT_H */