include/linux/compat.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_COMPAT_H
   3 #define _LINUX_COMPAT_H
   4 /*
   5  * These are the type definitions for the architecture specific
   6  * syscall compatibility layer.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/time.h>
  11
  12 #include <linux/stat.h>
  13 #include <linux/param.h>        /* for HZ */
  14 #include <linux/sem.h>
  15 #include <linux/socket.h>
  16 #include <linux/if.h>
  17 #include <linux/fs.h>
  18 #include <linux/aio_abi.h>      /* for aio_context_t */
  19 #include <linux/uaccess.h>
  20 #include <linux/unistd.h>
  21
  22 #include <asm/compat.h>
  23
  24 #ifdef CONFIG_COMPAT
  25 #include <asm/siginfo.h>
  26 #include <asm/signal.h>
  27 #endif
  28
  29 #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
  30 /*
  31  * It may be useful for an architecture to override the definitions of the
  32  * COMPAT_SYSCALL_DEFINE0 and COMPAT_SYSCALL_DEFINEx() macros, in particular
  33  * to use a different calling convention for syscalls. To allow for that,
  34  + the prototypes for the compat_sys_*() functions below will *not* be included
  35  * if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
  36  */
  37 #include <asm/syscall_wrapper.h>
  38 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
  39
  40 #ifndef COMPAT_USE_64BIT_TIME
  41 #define COMPAT_USE_64BIT_TIME 0
  42 #endif
  43
  44 #ifndef __SC_DELOUSE
  45 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
  46 #endif
  47
  48 #ifndef COMPAT_SYSCALL_DEFINE0
  49 #define COMPAT_SYSCALL_DEFINE0(name) \
  50         asmlinkage long compat_sys_##name(void); \
  51         ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
  52         asmlinkage long compat_sys_##name(void)
  53 #endif /* COMPAT_SYSCALL_DEFINE0 */
  54
  55 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
  56         COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
  57 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
  58         COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
  59 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
  60         COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
  61 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
  62         COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
  63 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
  64         COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
  65 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
  66         COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
  67
  68 /*
  69  * The asmlinkage stub is aliased to a function named __se_compat_sys_*() which
  70  * sign-extends 32-bit ints to longs whenever needed. The actual work is
  71  * done within __do_compat_sys_*().
  72  */
  73 #ifndef COMPAT_SYSCALL_DEFINEx
  74 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)                                    \
  75         __diag_push();                                                          \
  76         __diag_ignore(GCC, 8, "-Wattribute-alias",                              \
  77                       "Type aliasing is used to sanitize syscall arguments");\
  78         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));       \
  79         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))        \
  80                 __attribute__((alias(__stringify(__se_compat_sys##name))));     \
  81         ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO);                         \
  82         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  83         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));  \
  84         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))   \
  85         {                                                                       \
  86                 long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
  87                 __MAP(x,__SC_TEST,__VA_ARGS__);                                 \
  88                 return ret;                                                     \
  89         }                                                                       \
  90         __diag_pop();                                                           \
  91         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
  92 #endif /* COMPAT_SYSCALL_DEFINEx */
  93
  94 #ifdef CONFIG_COMPAT
  95
  96 #ifndef compat_user_stack_pointer
  97 #define compat_user_stack_pointer() current_user_stack_pointer()
  98 #endif
  99 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
 100 typedef struct compat_sigaltstack {
 101         compat_uptr_t                   ss_sp;
 102         int                             ss_flags;
 103         compat_size_t                   ss_size;
 104 } compat_stack_t;
 105 #endif
 106 #ifndef COMPAT_MINSIGSTKSZ
 107 #define COMPAT_MINSIGSTKSZ      MINSIGSTKSZ
 108 #endif
 109
 110 #define compat_jiffies_to_clock_t(x)    \
 111                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
 112
 113 typedef __compat_uid32_t        compat_uid_t;
 114 typedef __compat_gid32_t        compat_gid_t;
 115
 116 struct compat_sel_arg_struct;
 117 struct rusage;
 118
 119 struct old_itimerval32;
 120
 121 struct compat_tms {
 122         compat_clock_t          tms_utime;
 123         compat_clock_t          tms_stime;
 124         compat_clock_t          tms_cutime;
 125         compat_clock_t          tms_cstime;
 126 };
 127
 128 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 129
 130 typedef struct {
 131         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 132 } compat_sigset_t;
 133
 134 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
 135                             size_t sigsetsize);
 136
 137 struct compat_sigaction {
 138 #ifndef __ARCH_HAS_IRIX_SIGACTION
 139         compat_uptr_t                   sa_handler;
 140         compat_ulong_t                  sa_flags;
 141 #else
 142         compat_uint_t                   sa_flags;
 143         compat_uptr_t                   sa_handler;
 144 #endif
 145 #ifdef __ARCH_HAS_SA_RESTORER
 146         compat_uptr_t                   sa_restorer;
 147 #endif
 148         compat_sigset_t                 sa_mask __packed;
 149 };
 150
 151 typedef union compat_sigval {
 152         compat_int_t    sival_int;
 153         compat_uptr_t   sival_ptr;
 154 } compat_sigval_t;
 155
 156 typedef struct compat_siginfo {
 157         int si_signo;
 158 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
 159         int si_errno;
 160         int si_code;
 161 #else
 162         int si_code;
 163         int si_errno;
 164 #endif
 165
 166         union {
 167                 int _pad[128/sizeof(int) - 3];
 168
 169                 /* kill() */
 170                 struct {
 171                         compat_pid_t _pid;      /* sender's pid */
 172                         __compat_uid32_t _uid;  /* sender's uid */
 173                 } _kill;
 174
 175                 /* POSIX.1b timers */
 176                 struct {
 177                         compat_timer_t _tid;    /* timer id */
 178                         int _overrun;           /* overrun count */
 179                         compat_sigval_t _sigval;        /* same as below */
 180                 } _timer;
 181
 182                 /* POSIX.1b signals */
 183                 struct {
 184                         compat_pid_t _pid;      /* sender's pid */
 185                         __compat_uid32_t _uid;  /* sender's uid */
 186                         compat_sigval_t _sigval;
 187                 } _rt;
 188
 189                 /* SIGCHLD */
 190                 struct {
 191                         compat_pid_t _pid;      /* which child */
 192                         __compat_uid32_t _uid;  /* sender's uid */
 193                         int _status;            /* exit code */
 194                         compat_clock_t _utime;
 195                         compat_clock_t _stime;
 196                 } _sigchld;
 197
 198 #ifdef CONFIG_X86_X32_ABI
 199                 /* SIGCHLD (x32 version) */
 200                 struct {
 201                         compat_pid_t _pid;      /* which child */
 202                         __compat_uid32_t _uid;  /* sender's uid */
 203                         int _status;            /* exit code */
 204                         compat_s64 _utime;
 205                         compat_s64 _stime;
 206                 } _sigchld_x32;
 207 #endif
 208
 209                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 210                 struct {
 211                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
 212 #ifdef __ARCH_SI_TRAPNO
 213                         int _trapno;    /* TRAP # which caused the signal */
 214 #endif
 215 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 216                                      sizeof(short) : __alignof__(compat_uptr_t))
 217                         union {
 218                                 /*
 219                                  * used when si_code=BUS_MCEERR_AR or
 220                                  * used when si_code=BUS_MCEERR_AO
 221                                  */
 222                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
 223                                 /* used when si_code=SEGV_BNDERR */
 224                                 struct {
 225                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
 226                                         compat_uptr_t _lower;
 227                                         compat_uptr_t _upper;
 228                                 } _addr_bnd;
 229                                 /* used when si_code=SEGV_PKUERR */
 230                                 struct {
 231                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
 232                                         u32 _pkey;
 233                                 } _addr_pkey;
 234                         };
 235                 } _sigfault;
 236
 237                 /* SIGPOLL */
 238                 struct {
 239                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 240                         int _fd;
 241                 } _sigpoll;
 242
 243                 struct {
 244                         compat_uptr_t _call_addr; /* calling user insn */
 245                         int _syscall;   /* triggering system call number */
 246                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 247                 } _sigsys;
 248         } _sifields;
 249 } compat_siginfo_t;
 250
 251 struct compat_iovec {
 252         compat_uptr_t   iov_base;
 253         compat_size_t   iov_len;
 254 };
 255
 256 struct compat_rlimit {
 257         compat_ulong_t  rlim_cur;
 258         compat_ulong_t  rlim_max;
 259 };
 260
 261 struct compat_rusage {
 262         struct old_timeval32 ru_utime;
 263         struct old_timeval32 ru_stime;
 264         compat_long_t   ru_maxrss;
 265         compat_long_t   ru_ixrss;
 266         compat_long_t   ru_idrss;
 267         compat_long_t   ru_isrss;
 268         compat_long_t   ru_minflt;
 269         compat_long_t   ru_majflt;
 270         compat_long_t   ru_nswap;
 271         compat_long_t   ru_inblock;
 272         compat_long_t   ru_oublock;
 273         compat_long_t   ru_msgsnd;
 274         compat_long_t   ru_msgrcv;
 275         compat_long_t   ru_nsignals;
 276         compat_long_t   ru_nvcsw;
 277         compat_long_t   ru_nivcsw;
 278 };
 279
 280 extern int put_compat_rusage(const struct rusage *,
 281                              struct compat_rusage __user *);
 282
 283 struct compat_siginfo;
 284 struct __compat_aio_sigset;
 285
 286 struct compat_dirent {
 287         u32             d_ino;
 288         compat_off_t    d_off;
 289         u16             d_reclen;
 290         char            d_name[256];
 291 };
 292
 293 struct compat_ustat {
 294         compat_daddr_t          f_tfree;
 295         compat_ino_t            f_tinode;
 296         char                    f_fname[6];
 297         char                    f_fpack[6];
 298 };
 299
 300 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 301
 302 typedef struct compat_sigevent {
 303         compat_sigval_t sigev_value;
 304         compat_int_t sigev_signo;
 305         compat_int_t sigev_notify;
 306         union {
 307                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 308                 compat_int_t _tid;
 309
 310                 struct {
 311                         compat_uptr_t _function;
 312                         compat_uptr_t _attribute;
 313                 } _sigev_thread;
 314         } _sigev_un;
 315 } compat_sigevent_t;
 316
 317 struct compat_ifmap {
 318         compat_ulong_t mem_start;
 319         compat_ulong_t mem_end;
 320         unsigned short base_addr;
 321         unsigned char irq;
 322         unsigned char dma;
 323         unsigned char port;
 324 };
 325
 326 struct compat_if_settings {
 327         unsigned int type;      /* Type of physical device or protocol */
 328         unsigned int size;      /* Size of the data allocated by the caller */
 329         compat_uptr_t ifs_ifsu; /* union of pointers */
 330 };
 331
 332 struct compat_ifreq {
 333         union {
 334                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 335         } ifr_ifrn;
 336         union {
 337                 struct  sockaddr ifru_addr;
 338                 struct  sockaddr ifru_dstaddr;
 339                 struct  sockaddr ifru_broadaddr;
 340                 struct  sockaddr ifru_netmask;
 341                 struct  sockaddr ifru_hwaddr;
 342                 short   ifru_flags;
 343                 compat_int_t    ifru_ivalue;
 344                 compat_int_t    ifru_mtu;
 345                 struct  compat_ifmap ifru_map;
 346                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 347                 char    ifru_newname[IFNAMSIZ];
 348                 compat_caddr_t  ifru_data;
 349                 struct  compat_if_settings ifru_settings;
 350         } ifr_ifru;
 351 };
 352
 353 struct compat_ifconf {
 354         compat_int_t    ifc_len;                /* size of buffer */
 355         compat_caddr_t  ifcbuf;
 356 };
 357
 358 struct compat_robust_list {
 359         compat_uptr_t                   next;
 360 };
 361
 362 struct compat_robust_list_head {
 363         struct compat_robust_list       list;
 364         compat_long_t                   futex_offset;
 365         compat_uptr_t                   list_op_pending;
 366 };
 367
 368 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 369 struct compat_old_sigaction {
 370         compat_uptr_t                   sa_handler;
 371         compat_old_sigset_t             sa_mask;
 372         compat_ulong_t                  sa_flags;
 373         compat_uptr_t                   sa_restorer;
 374 };
 375 #endif
 376
 377 struct compat_keyctl_kdf_params {
 378         compat_uptr_t hashname;
 379         compat_uptr_t otherinfo;
 380         __u32 otherinfolen;
 381         __u32 __spare[8];
 382 };
 383
 384 struct compat_statfs;
 385 struct compat_statfs64;
 386 struct compat_old_linux_dirent;
 387 struct compat_linux_dirent;
 388 struct linux_dirent64;
 389 struct compat_msghdr;
 390 struct compat_mmsghdr;
 391 struct compat_sysinfo;
 392 struct compat_sysctl_args;
 393 struct compat_kexec_segment;
 394 struct compat_mq_attr;
 395 struct compat_msgbuf;
 396
 397 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 398
 399 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 400
 401 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 402                        unsigned long bitmap_size);
 403 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 404                        unsigned long bitmap_size);
 405 void copy_siginfo_to_external32(struct compat_siginfo *to,
 406                 const struct kernel_siginfo *from);
 407 int copy_siginfo_from_user32(kernel_siginfo_t *to,
 408                 const struct compat_siginfo __user *from);
 409 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
 410                 const kernel_siginfo_t *from);
 411 #ifndef copy_siginfo_to_user32
 412 #define copy_siginfo_to_user32 __copy_siginfo_to_user32
 413 #endif
 414 int get_compat_sigevent(struct sigevent *event,
 415                 const struct compat_sigevent __user *u_event);
 416
 417 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 418
 419 /*
 420  * Defined inline such that size can be compile time constant, which avoids
 421  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 422  */
 423 static inline int
 424 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 425                   unsigned int size)
 426 {
 427         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 428 #ifdef __BIG_ENDIAN
 429         compat_sigset_t v;
 430         switch (_NSIG_WORDS) {
 431         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 432                 /* fall through */
 433         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 434                 /* fall through */
 435         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 436                 /* fall through */
 437         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 438         }
 439         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 440 #else
 441         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 442 #endif
 443 }
 444
 445 extern int compat_ptrace_request(struct task_struct *child,
 446                                  compat_long_t request,
 447                                  compat_ulong_t addr, compat_ulong_t data);
 448
 449 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 450                                compat_ulong_t addr, compat_ulong_t data);
 451
 452 struct epoll_event;     /* fortunately, this one is fixed-layout */
 453
 454 extern ssize_t compat_rw_copy_check_uvector(int type,
 455                 const struct compat_iovec __user *uvector,
 456                 unsigned long nr_segs,
 457                 unsigned long fast_segs, struct iovec *fast_pointer,
 458                 struct iovec **ret_pointer);
 459
 460 extern void __user *compat_alloc_user_space(unsigned long len);
 461
 462 int compat_restore_altstack(const compat_stack_t __user *uss);
 463 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 464 #define unsafe_compat_save_altstack(uss, sp, label) do { \
 465         compat_stack_t __user *__uss = uss; \
 466         struct task_struct *t = current; \
 467         unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
 468                         &__uss->ss_sp, label); \
 469         unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
 470         unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
 471         if (t->sas_ss_flags & SS_AUTODISARM) \
 472                 sas_ss_reset(t); \
 473 } while (0);
 474
 475 /*
 476  * These syscall function prototypes are kept in the same order as
 477  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 478  * go below.
 479  *
 480  * Please note that these prototypes here are only provided for information
 481  * purposes, for static analysis, and for linking from the syscall table.
 482  * These functions should not be called elsewhere from kernel code.
 483  *
 484  * As the syscall calling convention may be different from the default
 485  * for architectures overriding the syscall calling convention, do not
 486  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 487  */
 488 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 489 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 490 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 491                                      u32 __user *iocb);
 492 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 493                                         compat_long_t min_nr,
 494                                         compat_long_t nr,
 495                                         struct io_event __user *events,
 496                                         struct old_timespec32 __user *timeout,
 497                                         const struct __compat_aio_sigset __user *usig);
 498 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 499                                         compat_long_t min_nr,
 500                                         compat_long_t nr,
 501                                         struct io_event __user *events,
 502                                         struct __kernel_timespec __user *timeout,
 503                                         const struct __compat_aio_sigset __user *usig);
 504
 505 /* fs/cookies.c */
 506 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 507
 508 /* fs/eventpoll.c */
 509 asmlinkage long compat_sys_epoll_pwait(int epfd,
 510                         struct epoll_event __user *events,
 511                         int maxevents, int timeout,
 512                         const compat_sigset_t __user *sigmask,
 513                         compat_size_t sigsetsize);
 514
 515 /* fs/fcntl.c */
 516 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 517                                  compat_ulong_t arg);
 518 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 519                                    compat_ulong_t arg);
 520
 521 /* fs/ioctl.c */
 522 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 523                                  compat_ulong_t arg);
 524
 525 /* fs/namespace.c */
 526 asmlinkage long compat_sys_mount(const char __user *dev_name,
 527                                  const char __user *dir_name,
 528                                  const char __user *type, compat_ulong_t flags,
 529                                  const void __user *data);
 530
 531 /* fs/open.c */
 532 asmlinkage long compat_sys_statfs(const char __user *pathname,
 533                                   struct compat_statfs __user *buf);
 534 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 535                                     compat_size_t sz,
 536                                     struct compat_statfs64 __user *buf);
 537 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 538                                    struct compat_statfs __user *buf);
 539 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 540                                      struct compat_statfs64 __user *buf);
 541 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 542 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 543 /* No generic prototype for truncate64, ftruncate64, fallocate */
 544 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 545                                   int flags, umode_t mode);
 546
 547 /* fs/readdir.c */
 548 asmlinkage long compat_sys_getdents(unsigned int fd,
 549                                     struct compat_linux_dirent __user *dirent,
 550                                     unsigned int count);
 551
 552 /* fs/read_write.c */
 553 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 554 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 555                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 556 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 557                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 558 /* No generic prototype for pread64 and pwrite64 */
 559 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 560                 const struct compat_iovec __user *vec,
 561                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 562 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 563                 const struct compat_iovec __user *vec,
 564                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 565 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 566 asmlinkage long compat_sys_preadv64(unsigned long fd,
 567                 const struct compat_iovec __user *vec,
 568                 unsigned long vlen, loff_t pos);
 569 #endif
 570
 571 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 572 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 573                 const struct compat_iovec __user *vec,
 574                 unsigned long vlen, loff_t pos);
 575 #endif
 576
 577 /* fs/sendfile.c */
 578 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 579                                     compat_off_t __user *offset, compat_size_t count);
 580 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 581                                     compat_loff_t __user *offset, compat_size_t count);
 582
 583 /* fs/select.c */
 584 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 585                                     compat_ulong_t __user *outp,
 586                                     compat_ulong_t __user *exp,
 587                                     struct old_timespec32 __user *tsp,
 588                                     void __user *sig);
 589 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 590                                     compat_ulong_t __user *outp,
 591                                     compat_ulong_t __user *exp,
 592                                     struct __kernel_timespec __user *tsp,
 593                                     void __user *sig);
 594 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 595                                  unsigned int nfds,
 596                                  struct old_timespec32 __user *tsp,
 597                                  const compat_sigset_t __user *sigmask,
 598                                  compat_size_t sigsetsize);
 599 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 600                                  unsigned int nfds,
 601                                  struct __kernel_timespec __user *tsp,
 602                                  const compat_sigset_t __user *sigmask,
 603                                  compat_size_t sigsetsize);
 604
 605 /* fs/signalfd.c */
 606 asmlinkage long compat_sys_signalfd4(int ufd,
 607                                      const compat_sigset_t __user *sigmask,
 608                                      compat_size_t sigsetsize, int flags);
 609
 610 /* fs/splice.c */
 611 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 612                                     unsigned int nr_segs, unsigned int flags);
 613
 614 /* fs/stat.c */
 615 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 616                                       const char __user *filename,
 617                                       struct compat_stat __user *statbuf,
 618                                       int flag);
 619 asmlinkage long compat_sys_newfstat(unsigned int fd,
 620                                     struct compat_stat __user *statbuf);
 621
 622 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 623
 624 /* kernel/exit.c */
 625 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 626                 struct compat_siginfo __user *, int,
 627                 struct compat_rusage __user *);
 628
 629
 630
 631 /* kernel/futex.c */
 632 asmlinkage long
 633 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 634                            compat_size_t len);
 635 asmlinkage long
 636 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 637                            compat_size_t __user *len_ptr);
 638
 639 /* kernel/itimer.c */
 640 asmlinkage long compat_sys_getitimer(int which,
 641                                      struct old_itimerval32 __user *it);
 642 asmlinkage long compat_sys_setitimer(int which,
 643                                      struct old_itimerval32 __user *in,
 644                                      struct old_itimerval32 __user *out);
 645
 646 /* kernel/kexec.c */
 647 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 648                                       compat_ulong_t nr_segments,
 649                                       struct compat_kexec_segment __user *,
 650                                       compat_ulong_t flags);
 651
 652 /* kernel/posix-timers.c */
 653 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 654                         struct compat_sigevent __user *timer_event_spec,
 655                         timer_t __user *created_timer_id);
 656
 657 /* kernel/ptrace.c */
 658 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 659                                   compat_long_t addr, compat_long_t data);
 660
 661 /* kernel/sched/core.c */
 662 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 663                                      unsigned int len,
 664                                      compat_ulong_t __user *user_mask_ptr);
 665 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 666                                      unsigned int len,
 667                                      compat_ulong_t __user *user_mask_ptr);
 668
 669 /* kernel/signal.c */
 670 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 671                                        compat_stack_t __user *uoss_ptr);
 672 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 673                                          compat_size_t sigsetsize);
 674 #ifndef CONFIG_ODD_RT_SIGACTION
 675 asmlinkage long compat_sys_rt_sigaction(int,
 676                                  const struct compat_sigaction __user *,
 677                                  struct compat_sigaction __user *,
 678                                  compat_size_t);
 679 #endif
 680 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 681                                           compat_sigset_t __user *oset,
 682                                           compat_size_t sigsetsize);
 683 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 684                                          compat_size_t sigsetsize);
 685 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 686                 struct compat_siginfo __user *uinfo,
 687                 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 688 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 689                 struct compat_siginfo __user *uinfo,
 690                 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 691 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 692                                 struct compat_siginfo __user *uinfo);
 693 /* No generic prototype for rt_sigreturn */
 694
 695 /* kernel/sys.c */
 696 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 697 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 698                                      struct compat_rlimit __user *rlim);
 699 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 700                                      struct compat_rlimit __user *rlim);
 701 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 702
 703 /* kernel/time.c */
 704 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 705                 struct timezone __user *tz);
 706 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 707                 struct timezone __user *tz);
 708
 709 /* kernel/timer.c */
 710 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 711
 712 /* ipc/mqueue.c */
 713 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 714                         int oflag, compat_mode_t mode,
 715                         struct compat_mq_attr __user *u_attr);
 716 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 717                         const struct compat_sigevent __user *u_notification);
 718 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 719                         const struct compat_mq_attr __user *u_mqstat,
 720                         struct compat_mq_attr __user *u_omqstat);
 721
 722 /* ipc/msg.c */
 723 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 724 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 725                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 726 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 727                 compat_ssize_t msgsz, int msgflg);
 728
 729 /* ipc/sem.c */
 730 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 731
 732 /* ipc/shm.c */
 733 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 734 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 735
 736 /* net/socket.c */
 737 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 738                             unsigned flags, struct sockaddr __user *addr,
 739                             int __user *addrlen);
 740 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 741                                       char __user *optval, unsigned int optlen);
 742 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 743                                       char __user *optval, int __user *optlen);
 744 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 745                                    unsigned flags);
 746 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 747                                    unsigned int flags);
 748
 749 /* mm/filemap.c: No generic prototype for readahead */
 750
 751 /* security/keys/keyctl.c */
 752 asmlinkage long compat_sys_keyctl(u32 option,
 753                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 754
 755 /* arch/example/kernel/sys_example.c */
 756 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 757                      const compat_uptr_t __user *envp);
 758
 759 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 760
 761 /* mm/, CONFIG_MMU only */
 762 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 763                                  compat_ulong_t mode,
 764                                  compat_ulong_t __user *nmask,
 765                                  compat_ulong_t maxnode, compat_ulong_t flags);
 766 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 767                                          compat_ulong_t __user *nmask,
 768                                          compat_ulong_t maxnode,
 769                                          compat_ulong_t addr,
 770                                          compat_ulong_t flags);
 771 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 772                                          compat_ulong_t maxnode);
 773 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 774                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 775                 const compat_ulong_t __user *new_nodes);
 776 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 777                                       __u32 __user *pages,
 778                                       const int __user *nodes,
 779                                       int __user *status,
 780                                       int flags);
 781
 782 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 783                                         compat_pid_t pid, int sig,
 784                                         struct compat_siginfo __user *uinfo);
 785 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 786                                     unsigned vlen, unsigned int flags,
 787                                     struct __kernel_timespec __user *timeout);
 788 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 789                                     unsigned vlen, unsigned int flags,
 790                                     struct old_timespec32 __user *timeout);
 791 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 792                                  compat_uint_t __user *stat_addr, int options,
 793                                  struct compat_rusage __user *ru);
 794 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 795                                             int, const char __user *);
 796 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 797                                              struct file_handle __user *handle,
 798                                              int flags);
 799 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 800                                     unsigned vlen, unsigned int flags);
 801 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 802                 const struct compat_iovec __user *lvec,
 803                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 804                 compat_ulong_t riovcnt, compat_ulong_t flags);
 805 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 806                 const struct compat_iovec __user *lvec,
 807                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 808                 compat_ulong_t riovcnt, compat_ulong_t flags);
 809 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 810                      const compat_uptr_t __user *argv,
 811                      const compat_uptr_t __user *envp, int flags);
 812 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 813                 const struct compat_iovec __user *vec,
 814                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 815 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 816                 const struct compat_iovec __user *vec,
 817                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 818 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 819 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 820                 const struct compat_iovec __user *vec,
 821                 unsigned long vlen, loff_t pos, rwf_t flags);
 822 #endif
 823
 824 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 825 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 826                 const struct compat_iovec __user *vec,
 827                 unsigned long vlen, loff_t pos, rwf_t flags);
 828 #endif
 829
 830
 831 /*
 832  * Deprecated system calls which are still defined in
 833  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 834  */
 835
 836 /* __ARCH_WANT_SYSCALL_NO_AT */
 837 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 838                                 umode_t mode);
 839
 840 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 841 asmlinkage long compat_sys_signalfd(int ufd,
 842                                     const compat_sigset_t __user *sigmask,
 843                                     compat_size_t sigsetsize);
 844
 845 /* __ARCH_WANT_SYSCALL_OFF_T */
 846 asmlinkage long compat_sys_newstat(const char __user *filename,
 847                                    struct compat_stat __user *statbuf);
 848 asmlinkage long compat_sys_newlstat(const char __user *filename,
 849                                     struct compat_stat __user *statbuf);
 850
 851 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 852 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 853                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 854                 struct old_timeval32 __user *tvp);
 855 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 856 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 857                                 unsigned flags);
 858 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
 859
 860 /* obsolete: fs/readdir.c */
 861 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 862                                        struct compat_old_linux_dirent __user *,
 863                                        unsigned int count);
 864
 865 /* obsolete: fs/select.c */
 866 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 867
 868 /* obsolete: ipc */
 869 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 870
 871 /* obsolete: kernel/signal.c */
 872 #ifdef __ARCH_WANT_SYS_SIGPENDING
 873 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 874 #endif
 875
 876 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 877 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 878                                        compat_old_sigset_t __user *oset);
 879 #endif
 880 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 881 asmlinkage long compat_sys_sigaction(int sig,
 882                                    const struct compat_old_sigaction __user *act,
 883                                    struct compat_old_sigaction __user *oact);
 884 #endif
 885
 886 /* obsolete: net/socket.c */
 887 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 888
 889 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 890
 891
 892 /*
 893  * For most but not all architectures, "am I in a compat syscall?" and
 894  * "am I a compat task?" are the same question.  For architectures on which
 895  * they aren't the same question, arch code can override in_compat_syscall.
 896  */
 897
 898 #ifndef in_compat_syscall
 899 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 900 #endif
 901
 902 /**
 903  * ns_to_old_timeval32 - Compat version of ns_to_timeval
 904  * @nsec:       the nanoseconds value to be converted
 905  *
 906  * Returns the old_timeval32 representation of the nsec parameter.
 907  */
 908 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
 909 {
 910         struct __kernel_old_timeval tv;
 911         struct old_timeval32 ctv;
 912
 913         tv = ns_to_kernel_old_timeval(nsec);
 914         ctv.tv_sec = tv.tv_sec;
 915         ctv.tv_usec = tv.tv_usec;
 916
 917         return ctv;
 918 }
 919
 920 /*
 921  * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 922  * directly.  Instead, use one of the functions which work equivalently, such
 923  * as the kcompat_sys_xyzyyz() functions prototyped below.
 924  */
 925
 926 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 927                      struct compat_statfs64 __user * buf);
 928 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 929                           struct compat_statfs64 __user * buf);
 930
 931 #else /* !CONFIG_COMPAT */
 932
 933 #define is_compat_task() (0)
 934 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
 935 #define in_compat_syscall in_compat_syscall
 936 static inline bool in_compat_syscall(void) { return false; }
 937
 938 #endif /* CONFIG_COMPAT */
 939
 940 /*
 941  * A pointer passed in from user mode. This should not
 942  * be used for syscall parameters, just declare them
 943  * as pointers because the syscall entry code will have
 944  * appropriately converted them already.
 945  */
 946 #ifndef compat_ptr
 947 static inline void __user *compat_ptr(compat_uptr_t uptr)
 948 {
 949         return (void __user *)(unsigned long)uptr;
 950 }
 951 #endif
 952
 953 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 954 {
 955         return (u32)(unsigned long)uptr;
 956 }
 957
 958 #endif /* _LINUX_COMPAT_H */