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 compat_itimerval {
 120         struct old_timeval32    it_interval;
 121         struct old_timeval32    it_value;
 122 };
 123
 124 struct itimerval;
 125 int get_compat_itimerval(struct itimerval *, const struct compat_itimerval __user *);
 126 int put_compat_itimerval(struct compat_itimerval __user *, const struct itimerval *);
 127
 128 struct compat_tms {
 129         compat_clock_t          tms_utime;
 130         compat_clock_t          tms_stime;
 131         compat_clock_t          tms_cutime;
 132         compat_clock_t          tms_cstime;
 133 };
 134
 135 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 136
 137 typedef struct {
 138         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 139 } compat_sigset_t;
 140
 141 int set_compat_user_sigmask(const compat_sigset_t __user *usigmask,
 142                             sigset_t *set, sigset_t *oldset,
 143                             size_t sigsetsize);
 144
 145 struct compat_sigaction {
 146 #ifndef __ARCH_HAS_IRIX_SIGACTION
 147         compat_uptr_t                   sa_handler;
 148         compat_ulong_t                  sa_flags;
 149 #else
 150         compat_uint_t                   sa_flags;
 151         compat_uptr_t                   sa_handler;
 152 #endif
 153 #ifdef __ARCH_HAS_SA_RESTORER
 154         compat_uptr_t                   sa_restorer;
 155 #endif
 156         compat_sigset_t                 sa_mask __packed;
 157 };
 158
 159 typedef union compat_sigval {
 160         compat_int_t    sival_int;
 161         compat_uptr_t   sival_ptr;
 162 } compat_sigval_t;
 163
 164 typedef struct compat_siginfo {
 165         int si_signo;
 166 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
 167         int si_errno;
 168         int si_code;
 169 #else
 170         int si_code;
 171         int si_errno;
 172 #endif
 173
 174         union {
 175                 int _pad[128/sizeof(int) - 3];
 176
 177                 /* kill() */
 178                 struct {
 179                         compat_pid_t _pid;      /* sender's pid */
 180                         __compat_uid32_t _uid;  /* sender's uid */
 181                 } _kill;
 182
 183                 /* POSIX.1b timers */
 184                 struct {
 185                         compat_timer_t _tid;    /* timer id */
 186                         int _overrun;           /* overrun count */
 187                         compat_sigval_t _sigval;        /* same as below */
 188                 } _timer;
 189
 190                 /* POSIX.1b signals */
 191                 struct {
 192                         compat_pid_t _pid;      /* sender's pid */
 193                         __compat_uid32_t _uid;  /* sender's uid */
 194                         compat_sigval_t _sigval;
 195                 } _rt;
 196
 197                 /* SIGCHLD */
 198                 struct {
 199                         compat_pid_t _pid;      /* which child */
 200                         __compat_uid32_t _uid;  /* sender's uid */
 201                         int _status;            /* exit code */
 202                         compat_clock_t _utime;
 203                         compat_clock_t _stime;
 204                 } _sigchld;
 205
 206 #ifdef CONFIG_X86_X32_ABI
 207                 /* SIGCHLD (x32 version) */
 208                 struct {
 209                         compat_pid_t _pid;      /* which child */
 210                         __compat_uid32_t _uid;  /* sender's uid */
 211                         int _status;            /* exit code */
 212                         compat_s64 _utime;
 213                         compat_s64 _stime;
 214                 } _sigchld_x32;
 215 #endif
 216
 217                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 218                 struct {
 219                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
 220 #ifdef __ARCH_SI_TRAPNO
 221                         int _trapno;    /* TRAP # which caused the signal */
 222 #endif
 223 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 224                                      sizeof(short) : __alignof__(compat_uptr_t))
 225                         union {
 226                                 /*
 227                                  * used when si_code=BUS_MCEERR_AR or
 228                                  * used when si_code=BUS_MCEERR_AO
 229                                  */
 230                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
 231                                 /* used when si_code=SEGV_BNDERR */
 232                                 struct {
 233                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
 234                                         compat_uptr_t _lower;
 235                                         compat_uptr_t _upper;
 236                                 } _addr_bnd;
 237                                 /* used when si_code=SEGV_PKUERR */
 238                                 struct {
 239                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
 240                                         u32 _pkey;
 241                                 } _addr_pkey;
 242                         };
 243                 } _sigfault;
 244
 245                 /* SIGPOLL */
 246                 struct {
 247                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 248                         int _fd;
 249                 } _sigpoll;
 250
 251                 struct {
 252                         compat_uptr_t _call_addr; /* calling user insn */
 253                         int _syscall;   /* triggering system call number */
 254                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 255                 } _sigsys;
 256         } _sifields;
 257 } compat_siginfo_t;
 258
 259 /*
 260  * These functions operate on 32- or 64-bit specs depending on
 261  * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments.
 262  */
 263 extern int compat_get_timespec(struct timespec *, const void __user *);
 264 extern int compat_put_timespec(const struct timespec *, void __user *);
 265 extern int compat_get_timeval(struct timeval *, const void __user *);
 266 extern int compat_put_timeval(const struct timeval *, void __user *);
 267
 268 struct compat_iovec {
 269         compat_uptr_t   iov_base;
 270         compat_size_t   iov_len;
 271 };
 272
 273 struct compat_rlimit {
 274         compat_ulong_t  rlim_cur;
 275         compat_ulong_t  rlim_max;
 276 };
 277
 278 struct compat_rusage {
 279         struct old_timeval32 ru_utime;
 280         struct old_timeval32 ru_stime;
 281         compat_long_t   ru_maxrss;
 282         compat_long_t   ru_ixrss;
 283         compat_long_t   ru_idrss;
 284         compat_long_t   ru_isrss;
 285         compat_long_t   ru_minflt;
 286         compat_long_t   ru_majflt;
 287         compat_long_t   ru_nswap;
 288         compat_long_t   ru_inblock;
 289         compat_long_t   ru_oublock;
 290         compat_long_t   ru_msgsnd;
 291         compat_long_t   ru_msgrcv;
 292         compat_long_t   ru_nsignals;
 293         compat_long_t   ru_nvcsw;
 294         compat_long_t   ru_nivcsw;
 295 };
 296
 297 extern int put_compat_rusage(const struct rusage *,
 298                              struct compat_rusage __user *);
 299
 300 struct compat_siginfo;
 301 struct __compat_aio_sigset;
 302
 303 struct compat_dirent {
 304         u32             d_ino;
 305         compat_off_t    d_off;
 306         u16             d_reclen;
 307         char            d_name[256];
 308 };
 309
 310 struct compat_ustat {
 311         compat_daddr_t          f_tfree;
 312         compat_ino_t            f_tinode;
 313         char                    f_fname[6];
 314         char                    f_fpack[6];
 315 };
 316
 317 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 318
 319 typedef struct compat_sigevent {
 320         compat_sigval_t sigev_value;
 321         compat_int_t sigev_signo;
 322         compat_int_t sigev_notify;
 323         union {
 324                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 325                 compat_int_t _tid;
 326
 327                 struct {
 328                         compat_uptr_t _function;
 329                         compat_uptr_t _attribute;
 330                 } _sigev_thread;
 331         } _sigev_un;
 332 } compat_sigevent_t;
 333
 334 struct compat_ifmap {
 335         compat_ulong_t mem_start;
 336         compat_ulong_t mem_end;
 337         unsigned short base_addr;
 338         unsigned char irq;
 339         unsigned char dma;
 340         unsigned char port;
 341 };
 342
 343 struct compat_if_settings {
 344         unsigned int type;      /* Type of physical device or protocol */
 345         unsigned int size;      /* Size of the data allocated by the caller */
 346         compat_uptr_t ifs_ifsu; /* union of pointers */
 347 };
 348
 349 struct compat_ifreq {
 350         union {
 351                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 352         } ifr_ifrn;
 353         union {
 354                 struct  sockaddr ifru_addr;
 355                 struct  sockaddr ifru_dstaddr;
 356                 struct  sockaddr ifru_broadaddr;
 357                 struct  sockaddr ifru_netmask;
 358                 struct  sockaddr ifru_hwaddr;
 359                 short   ifru_flags;
 360                 compat_int_t    ifru_ivalue;
 361                 compat_int_t    ifru_mtu;
 362                 struct  compat_ifmap ifru_map;
 363                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 364                 char    ifru_newname[IFNAMSIZ];
 365                 compat_caddr_t  ifru_data;
 366                 struct  compat_if_settings ifru_settings;
 367         } ifr_ifru;
 368 };
 369
 370 struct compat_ifconf {
 371         compat_int_t    ifc_len;                /* size of buffer */
 372         compat_caddr_t  ifcbuf;
 373 };
 374
 375 struct compat_robust_list {
 376         compat_uptr_t                   next;
 377 };
 378
 379 struct compat_robust_list_head {
 380         struct compat_robust_list       list;
 381         compat_long_t                   futex_offset;
 382         compat_uptr_t                   list_op_pending;
 383 };
 384
 385 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 386 struct compat_old_sigaction {
 387         compat_uptr_t                   sa_handler;
 388         compat_old_sigset_t             sa_mask;
 389         compat_ulong_t                  sa_flags;
 390         compat_uptr_t                   sa_restorer;
 391 };
 392 #endif
 393
 394 struct compat_keyctl_kdf_params {
 395         compat_uptr_t hashname;
 396         compat_uptr_t otherinfo;
 397         __u32 otherinfolen;
 398         __u32 __spare[8];
 399 };
 400
 401 struct compat_statfs;
 402 struct compat_statfs64;
 403 struct compat_old_linux_dirent;
 404 struct compat_linux_dirent;
 405 struct linux_dirent64;
 406 struct compat_msghdr;
 407 struct compat_mmsghdr;
 408 struct compat_sysinfo;
 409 struct compat_sysctl_args;
 410 struct compat_kexec_segment;
 411 struct compat_mq_attr;
 412 struct compat_msgbuf;
 413
 414 extern void compat_exit_robust_list(struct task_struct *curr);
 415
 416 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 417
 418 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 419
 420 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 421                        unsigned long bitmap_size);
 422 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 423                        unsigned long bitmap_size);
 424 int copy_siginfo_from_user32(kernel_siginfo_t *to, const struct compat_siginfo __user *from);
 425 int copy_siginfo_to_user32(struct compat_siginfo __user *to, const kernel_siginfo_t *from);
 426 int get_compat_sigevent(struct sigevent *event,
 427                 const struct compat_sigevent __user *u_event);
 428
 429 static inline int old_timeval32_compare(struct old_timeval32 *lhs,
 430                                         struct old_timeval32 *rhs)
 431 {
 432         if (lhs->tv_sec < rhs->tv_sec)
 433                 return -1;
 434         if (lhs->tv_sec > rhs->tv_sec)
 435                 return 1;
 436         return lhs->tv_usec - rhs->tv_usec;
 437 }
 438
 439 static inline int old_timespec32_compare(struct old_timespec32 *lhs,
 440                                         struct old_timespec32 *rhs)
 441 {
 442         if (lhs->tv_sec < rhs->tv_sec)
 443                 return -1;
 444         if (lhs->tv_sec > rhs->tv_sec)
 445                 return 1;
 446         return lhs->tv_nsec - rhs->tv_nsec;
 447 }
 448
 449 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 450
 451 /*
 452  * Defined inline such that size can be compile time constant, which avoids
 453  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 454  */
 455 static inline int
 456 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 457                   unsigned int size)
 458 {
 459         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 460 #ifdef __BIG_ENDIAN
 461         compat_sigset_t v;
 462         switch (_NSIG_WORDS) {
 463         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 464                 /* fall through */
 465         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 466                 /* fall through */
 467         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 468                 /* fall through */
 469         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 470         }
 471         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 472 #else
 473         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 474 #endif
 475 }
 476
 477 extern int compat_ptrace_request(struct task_struct *child,
 478                                  compat_long_t request,
 479                                  compat_ulong_t addr, compat_ulong_t data);
 480
 481 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 482                                compat_ulong_t addr, compat_ulong_t data);
 483
 484 struct epoll_event;     /* fortunately, this one is fixed-layout */
 485
 486 extern ssize_t compat_rw_copy_check_uvector(int type,
 487                 const struct compat_iovec __user *uvector,
 488                 unsigned long nr_segs,
 489                 unsigned long fast_segs, struct iovec *fast_pointer,
 490                 struct iovec **ret_pointer);
 491
 492 extern void __user *compat_alloc_user_space(unsigned long len);
 493
 494 int compat_restore_altstack(const compat_stack_t __user *uss);
 495 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 496 #define compat_save_altstack_ex(uss, sp) do { \
 497         compat_stack_t __user *__uss = uss; \
 498         struct task_struct *t = current; \
 499         put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
 500         put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
 501         put_user_ex(t->sas_ss_size, &__uss->ss_size); \
 502         if (t->sas_ss_flags & SS_AUTODISARM) \
 503                 sas_ss_reset(t); \
 504 } while (0);
 505
 506 /*
 507  * These syscall function prototypes are kept in the same order as
 508  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 509  * go below.
 510  *
 511  * Please note that these prototypes here are only provided for information
 512  * purposes, for static analysis, and for linking from the syscall table.
 513  * These functions should not be called elsewhere from kernel code.
 514  *
 515  * As the syscall calling convention may be different from the default
 516  * for architectures overriding the syscall calling convention, do not
 517  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 518  */
 519 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 520 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 521 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 522                                      u32 __user *iocb);
 523 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 524                                         compat_long_t min_nr,
 525                                         compat_long_t nr,
 526                                         struct io_event __user *events,
 527                                         struct old_timespec32 __user *timeout,
 528                                         const struct __compat_aio_sigset __user *usig);
 529 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 530                                         compat_long_t min_nr,
 531                                         compat_long_t nr,
 532                                         struct io_event __user *events,
 533                                         struct __kernel_timespec __user *timeout,
 534                                         const struct __compat_aio_sigset __user *usig);
 535
 536 /* fs/cookies.c */
 537 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 538
 539 /* fs/eventpoll.c */
 540 asmlinkage long compat_sys_epoll_pwait(int epfd,
 541                         struct epoll_event __user *events,
 542                         int maxevents, int timeout,
 543                         const compat_sigset_t __user *sigmask,
 544                         compat_size_t sigsetsize);
 545
 546 /* fs/fcntl.c */
 547 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 548                                  compat_ulong_t arg);
 549 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 550                                    compat_ulong_t arg);
 551
 552 /* fs/ioctl.c */
 553 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 554                                  compat_ulong_t arg);
 555
 556 /* fs/namespace.c */
 557 asmlinkage long compat_sys_mount(const char __user *dev_name,
 558                                  const char __user *dir_name,
 559                                  const char __user *type, compat_ulong_t flags,
 560                                  const void __user *data);
 561
 562 /* fs/open.c */
 563 asmlinkage long compat_sys_statfs(const char __user *pathname,
 564                                   struct compat_statfs __user *buf);
 565 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 566                                     compat_size_t sz,
 567                                     struct compat_statfs64 __user *buf);
 568 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 569                                    struct compat_statfs __user *buf);
 570 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 571                                      struct compat_statfs64 __user *buf);
 572 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 573 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 574 /* No generic prototype for truncate64, ftruncate64, fallocate */
 575 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 576                                   int flags, umode_t mode);
 577
 578 /* fs/readdir.c */
 579 asmlinkage long compat_sys_getdents(unsigned int fd,
 580                                     struct compat_linux_dirent __user *dirent,
 581                                     unsigned int count);
 582
 583 /* fs/read_write.c */
 584 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 585 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 586                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 587 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 588                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 589 /* No generic prototype for pread64 and pwrite64 */
 590 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 591                 const struct compat_iovec __user *vec,
 592                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 593 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 594                 const struct compat_iovec __user *vec,
 595                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 596 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 597 asmlinkage long compat_sys_preadv64(unsigned long fd,
 598                 const struct compat_iovec __user *vec,
 599                 unsigned long vlen, loff_t pos);
 600 #endif
 601
 602 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 603 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 604                 const struct compat_iovec __user *vec,
 605                 unsigned long vlen, loff_t pos);
 606 #endif
 607
 608 /* fs/sendfile.c */
 609 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 610                                     compat_off_t __user *offset, compat_size_t count);
 611 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 612                                     compat_loff_t __user *offset, compat_size_t count);
 613
 614 /* fs/select.c */
 615 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 616                                     compat_ulong_t __user *outp,
 617                                     compat_ulong_t __user *exp,
 618                                     struct old_timespec32 __user *tsp,
 619                                     void __user *sig);
 620 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 621                                     compat_ulong_t __user *outp,
 622                                     compat_ulong_t __user *exp,
 623                                     struct __kernel_timespec __user *tsp,
 624                                     void __user *sig);
 625 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 626                                  unsigned int nfds,
 627                                  struct old_timespec32 __user *tsp,
 628                                  const compat_sigset_t __user *sigmask,
 629                                  compat_size_t sigsetsize);
 630 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 631                                  unsigned int nfds,
 632                                  struct __kernel_timespec __user *tsp,
 633                                  const compat_sigset_t __user *sigmask,
 634                                  compat_size_t sigsetsize);
 635
 636 /* fs/signalfd.c */
 637 asmlinkage long compat_sys_signalfd4(int ufd,
 638                                      const compat_sigset_t __user *sigmask,
 639                                      compat_size_t sigsetsize, int flags);
 640
 641 /* fs/splice.c */
 642 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 643                                     unsigned int nr_segs, unsigned int flags);
 644
 645 /* fs/stat.c */
 646 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 647                                       const char __user *filename,
 648                                       struct compat_stat __user *statbuf,
 649                                       int flag);
 650 asmlinkage long compat_sys_newfstat(unsigned int fd,
 651                                     struct compat_stat __user *statbuf);
 652
 653 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 654
 655 /* kernel/exit.c */
 656 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 657                 struct compat_siginfo __user *, int,
 658                 struct compat_rusage __user *);
 659
 660
 661
 662 /* kernel/futex.c */
 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/itimer.c */
 671 asmlinkage long compat_sys_getitimer(int which,
 672                                      struct compat_itimerval __user *it);
 673 asmlinkage long compat_sys_setitimer(int which,
 674                                      struct compat_itimerval __user *in,
 675                                      struct compat_itimerval __user *out);
 676
 677 /* kernel/kexec.c */
 678 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 679                                       compat_ulong_t nr_segments,
 680                                       struct compat_kexec_segment __user *,
 681                                       compat_ulong_t flags);
 682
 683 /* kernel/posix-timers.c */
 684 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 685                         struct compat_sigevent __user *timer_event_spec,
 686                         timer_t __user *created_timer_id);
 687
 688 /* kernel/ptrace.c */
 689 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 690                                   compat_long_t addr, compat_long_t data);
 691
 692 /* kernel/sched/core.c */
 693 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 694                                      unsigned int len,
 695                                      compat_ulong_t __user *user_mask_ptr);
 696 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 697                                      unsigned int len,
 698                                      compat_ulong_t __user *user_mask_ptr);
 699
 700 /* kernel/signal.c */
 701 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 702                                        compat_stack_t __user *uoss_ptr);
 703 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 704                                          compat_size_t sigsetsize);
 705 #ifndef CONFIG_ODD_RT_SIGACTION
 706 asmlinkage long compat_sys_rt_sigaction(int,
 707                                  const struct compat_sigaction __user *,
 708                                  struct compat_sigaction __user *,
 709                                  compat_size_t);
 710 #endif
 711 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 712                                           compat_sigset_t __user *oset,
 713                                           compat_size_t sigsetsize);
 714 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 715                                          compat_size_t sigsetsize);
 716 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 717                 struct compat_siginfo __user *uinfo,
 718                 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 719 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 720                 struct compat_siginfo __user *uinfo,
 721                 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 722 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 723                                 struct compat_siginfo __user *uinfo);
 724 /* No generic prototype for rt_sigreturn */
 725
 726 /* kernel/sys.c */
 727 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 728 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 729                                      struct compat_rlimit __user *rlim);
 730 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 731                                      struct compat_rlimit __user *rlim);
 732 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 733
 734 /* kernel/time.c */
 735 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 736                 struct timezone __user *tz);
 737 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 738                 struct timezone __user *tz);
 739
 740 /* kernel/timer.c */
 741 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 742
 743 /* ipc/mqueue.c */
 744 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 745                         int oflag, compat_mode_t mode,
 746                         struct compat_mq_attr __user *u_attr);
 747 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 748                         const struct compat_sigevent __user *u_notification);
 749 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 750                         const struct compat_mq_attr __user *u_mqstat,
 751                         struct compat_mq_attr __user *u_omqstat);
 752
 753 /* ipc/msg.c */
 754 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 755 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 756                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 757 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 758                 compat_ssize_t msgsz, int msgflg);
 759
 760 /* ipc/sem.c */
 761 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 762
 763 /* ipc/shm.c */
 764 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 765 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 766
 767 /* net/socket.c */
 768 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 769                             unsigned flags, struct sockaddr __user *addr,
 770                             int __user *addrlen);
 771 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 772                                       char __user *optval, unsigned int optlen);
 773 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 774                                       char __user *optval, int __user *optlen);
 775 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 776                                    unsigned flags);
 777 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 778                                    unsigned int flags);
 779
 780 /* mm/filemap.c: No generic prototype for readahead */
 781
 782 /* security/keys/keyctl.c */
 783 asmlinkage long compat_sys_keyctl(u32 option,
 784                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 785
 786 /* arch/example/kernel/sys_example.c */
 787 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 788                      const compat_uptr_t __user *envp);
 789
 790 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 791
 792 /* mm/, CONFIG_MMU only */
 793 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 794                                  compat_ulong_t mode,
 795                                  compat_ulong_t __user *nmask,
 796                                  compat_ulong_t maxnode, compat_ulong_t flags);
 797 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 798                                          compat_ulong_t __user *nmask,
 799                                          compat_ulong_t maxnode,
 800                                          compat_ulong_t addr,
 801                                          compat_ulong_t flags);
 802 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 803                                          compat_ulong_t maxnode);
 804 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 805                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 806                 const compat_ulong_t __user *new_nodes);
 807 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 808                                       __u32 __user *pages,
 809                                       const int __user *nodes,
 810                                       int __user *status,
 811                                       int flags);
 812
 813 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 814                                         compat_pid_t pid, int sig,
 815                                         struct compat_siginfo __user *uinfo);
 816 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 817                                     unsigned vlen, unsigned int flags,
 818                                     struct __kernel_timespec __user *timeout);
 819 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 820                                     unsigned vlen, unsigned int flags,
 821                                     struct old_timespec32 __user *timeout);
 822 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 823                                  compat_uint_t __user *stat_addr, int options,
 824                                  struct compat_rusage __user *ru);
 825 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 826                                             int, const char __user *);
 827 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 828                                              struct file_handle __user *handle,
 829                                              int flags);
 830 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 831                                     unsigned vlen, unsigned int flags);
 832 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 833                 const struct compat_iovec __user *lvec,
 834                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 835                 compat_ulong_t riovcnt, compat_ulong_t flags);
 836 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 837                 const struct compat_iovec __user *lvec,
 838                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 839                 compat_ulong_t riovcnt, compat_ulong_t flags);
 840 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 841                      const compat_uptr_t __user *argv,
 842                      const compat_uptr_t __user *envp, int flags);
 843 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 844                 const struct compat_iovec __user *vec,
 845                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 846 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 847                 const struct compat_iovec __user *vec,
 848                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 849 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 850 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 851                 const struct compat_iovec __user *vec,
 852                 unsigned long vlen, loff_t pos, rwf_t flags);
 853 #endif
 854
 855 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 856 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 857                 const struct compat_iovec __user *vec,
 858                 unsigned long vlen, loff_t pos, rwf_t flags);
 859 #endif
 860
 861
 862 /*
 863  * Deprecated system calls which are still defined in
 864  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 865  */
 866
 867 /* __ARCH_WANT_SYSCALL_NO_AT */
 868 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 869                                 umode_t mode);
 870
 871 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 872 asmlinkage long compat_sys_signalfd(int ufd,
 873                                     const compat_sigset_t __user *sigmask,
 874                                     compat_size_t sigsetsize);
 875
 876 /* __ARCH_WANT_SYSCALL_OFF_T */
 877 asmlinkage long compat_sys_newstat(const char __user *filename,
 878                                    struct compat_stat __user *statbuf);
 879 asmlinkage long compat_sys_newlstat(const char __user *filename,
 880                                     struct compat_stat __user *statbuf);
 881
 882 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 883 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 884                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 885                 struct old_timeval32 __user *tvp);
 886 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 887 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 888                                 unsigned flags);
 889 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
 890
 891 /* obsolete: fs/readdir.c */
 892 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 893                                        struct compat_old_linux_dirent __user *,
 894                                        unsigned int count);
 895
 896 /* obsolete: fs/select.c */
 897 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 898
 899 /* obsolete: ipc */
 900 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 901
 902 /* obsolete: kernel/signal.c */
 903 #ifdef __ARCH_WANT_SYS_SIGPENDING
 904 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 905 #endif
 906
 907 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 908 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 909                                        compat_old_sigset_t __user *oset);
 910 #endif
 911 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 912 asmlinkage long compat_sys_sigaction(int sig,
 913                                    const struct compat_old_sigaction __user *act,
 914                                    struct compat_old_sigaction __user *oact);
 915 #endif
 916
 917 /* obsolete: net/socket.c */
 918 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 919
 920 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 921
 922
 923 /*
 924  * For most but not all architectures, "am I in a compat syscall?" and
 925  * "am I a compat task?" are the same question.  For architectures on which
 926  * they aren't the same question, arch code can override in_compat_syscall.
 927  */
 928
 929 #ifndef in_compat_syscall
 930 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 931 #endif
 932
 933 /**
 934  * ns_to_old_timeval32 - Compat version of ns_to_timeval
 935  * @nsec:       the nanoseconds value to be converted
 936  *
 937  * Returns the old_timeval32 representation of the nsec parameter.
 938  */
 939 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
 940 {
 941         struct timeval tv;
 942         struct old_timeval32 ctv;
 943
 944         tv = ns_to_timeval(nsec);
 945         ctv.tv_sec = tv.tv_sec;
 946         ctv.tv_usec = tv.tv_usec;
 947
 948         return ctv;
 949 }
 950
 951 /*
 952  * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 953  * directly.  Instead, use one of the functions which work equivalently, such
 954  * as the kcompat_sys_xyzyyz() functions prototyped below.
 955  */
 956
 957 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 958                      struct compat_statfs64 __user * buf);
 959 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 960                           struct compat_statfs64 __user * buf);
 961
 962 #else /* !CONFIG_COMPAT */
 963
 964 #define is_compat_task() (0)
 965 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
 966 #define in_compat_syscall in_compat_syscall
 967 static inline bool in_compat_syscall(void) { return false; }
 968
 969 #endif /* CONFIG_COMPAT */
 970
 971 #endif /* _LINUX_COMPAT_H */