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 #include <asm/siginfo.h>
  24 #include <asm/signal.h>
  25
  26 #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
  27 /*
  28  * It may be useful for an architecture to override the definitions of the
  29  * COMPAT_SYSCALL_DEFINE0 and COMPAT_SYSCALL_DEFINEx() macros, in particular
  30  * to use a different calling convention for syscalls. To allow for that,
  31  + the prototypes for the compat_sys_*() functions below will *not* be included
  32  * if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
  33  */
  34 #include <asm/syscall_wrapper.h>
  35 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
  36
  37 #ifndef COMPAT_USE_64BIT_TIME
  38 #define COMPAT_USE_64BIT_TIME 0
  39 #endif
  40
  41 #ifndef __SC_DELOUSE
  42 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
  43 #endif
  44
  45 #ifndef COMPAT_SYSCALL_DEFINE0
  46 #define COMPAT_SYSCALL_DEFINE0(name) \
  47         asmlinkage long compat_sys_##name(void); \
  48         ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
  49         asmlinkage long compat_sys_##name(void)
  50 #endif /* COMPAT_SYSCALL_DEFINE0 */
  51
  52 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
  53         COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
  54 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
  55         COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
  56 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
  57         COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
  58 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
  59         COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
  60 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
  61         COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
  62 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
  63         COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
  64
  65 /*
  66  * The asmlinkage stub is aliased to a function named __se_compat_sys_*() which
  67  * sign-extends 32-bit ints to longs whenever needed. The actual work is
  68  * done within __do_compat_sys_*().
  69  */
  70 #ifndef COMPAT_SYSCALL_DEFINEx
  71 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)                                    \
  72         __diag_push();                                                          \
  73         __diag_ignore(GCC, 8, "-Wattribute-alias",                              \
  74                       "Type aliasing is used to sanitize syscall arguments");\
  75         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))        \
  76                 __attribute__((alias(__stringify(__se_compat_sys##name))));     \
  77         ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO);                         \
  78         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  79         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));  \
  80         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))   \
  81         {                                                                       \
  82                 long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
  83                 __MAP(x,__SC_TEST,__VA_ARGS__);                                 \
  84                 return ret;                                                     \
  85         }                                                                       \
  86         __diag_pop();                                                           \
  87         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
  88 #endif /* COMPAT_SYSCALL_DEFINEx */
  89
  90 struct compat_iovec {
  91         compat_uptr_t   iov_base;
  92         compat_size_t   iov_len;
  93 };
  94
  95 #ifndef compat_user_stack_pointer
  96 #define compat_user_stack_pointer() current_user_stack_pointer()
  97 #endif
  98 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
  99 typedef struct compat_sigaltstack {
 100         compat_uptr_t                   ss_sp;
 101         int                             ss_flags;
 102         compat_size_t                   ss_size;
 103 } compat_stack_t;
 104 #endif
 105 #ifndef COMPAT_MINSIGSTKSZ
 106 #define COMPAT_MINSIGSTKSZ      MINSIGSTKSZ
 107 #endif
 108
 109 #define compat_jiffies_to_clock_t(x)    \
 110                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
 111
 112 typedef __compat_uid32_t        compat_uid_t;
 113 typedef __compat_gid32_t        compat_gid_t;
 114
 115 struct compat_sel_arg_struct;
 116 struct rusage;
 117
 118 struct old_itimerval32;
 119
 120 struct compat_tms {
 121         compat_clock_t          tms_utime;
 122         compat_clock_t          tms_stime;
 123         compat_clock_t          tms_cutime;
 124         compat_clock_t          tms_cstime;
 125 };
 126
 127 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 128
 129 typedef struct {
 130         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 131 } compat_sigset_t;
 132
 133 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
 134                             size_t sigsetsize);
 135
 136 struct compat_sigaction {
 137 #ifndef __ARCH_HAS_IRIX_SIGACTION
 138         compat_uptr_t                   sa_handler;
 139         compat_ulong_t                  sa_flags;
 140 #else
 141         compat_uint_t                   sa_flags;
 142         compat_uptr_t                   sa_handler;
 143 #endif
 144 #ifdef __ARCH_HAS_SA_RESTORER
 145         compat_uptr_t                   sa_restorer;
 146 #endif
 147         compat_sigset_t                 sa_mask __packed;
 148 };
 149
 150 typedef union compat_sigval {
 151         compat_int_t    sival_int;
 152         compat_uptr_t   sival_ptr;
 153 } compat_sigval_t;
 154
 155 typedef struct compat_siginfo {
 156         int si_signo;
 157 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
 158         int si_errno;
 159         int si_code;
 160 #else
 161         int si_code;
 162         int si_errno;
 163 #endif
 164
 165         union {
 166                 int _pad[128/sizeof(int) - 3];
 167
 168                 /* kill() */
 169                 struct {
 170                         compat_pid_t _pid;      /* sender's pid */
 171                         __compat_uid32_t _uid;  /* sender's uid */
 172                 } _kill;
 173
 174                 /* POSIX.1b timers */
 175                 struct {
 176                         compat_timer_t _tid;    /* timer id */
 177                         int _overrun;           /* overrun count */
 178                         compat_sigval_t _sigval;        /* same as below */
 179                 } _timer;
 180
 181                 /* POSIX.1b signals */
 182                 struct {
 183                         compat_pid_t _pid;      /* sender's pid */
 184                         __compat_uid32_t _uid;  /* sender's uid */
 185                         compat_sigval_t _sigval;
 186                 } _rt;
 187
 188                 /* SIGCHLD */
 189                 struct {
 190                         compat_pid_t _pid;      /* which child */
 191                         __compat_uid32_t _uid;  /* sender's uid */
 192                         int _status;            /* exit code */
 193                         compat_clock_t _utime;
 194                         compat_clock_t _stime;
 195                 } _sigchld;
 196
 197 #ifdef CONFIG_X86_X32_ABI
 198                 /* SIGCHLD (x32 version) */
 199                 struct {
 200                         compat_pid_t _pid;      /* which child */
 201                         __compat_uid32_t _uid;  /* sender's uid */
 202                         int _status;            /* exit code */
 203                         compat_s64 _utime;
 204                         compat_s64 _stime;
 205                 } _sigchld_x32;
 206 #endif
 207
 208                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 209                 struct {
 210                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
 211 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 212                                      sizeof(short) : __alignof__(compat_uptr_t))
 213                         union {
 214                                 /* used on alpha and sparc */
 215                                 int _trapno;    /* TRAP # which caused the signal */
 216                                 /*
 217                                  * used when si_code=BUS_MCEERR_AR or
 218                                  * used when si_code=BUS_MCEERR_AO
 219                                  */
 220                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
 221                                 /* used when si_code=SEGV_BNDERR */
 222                                 struct {
 223                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
 224                                         compat_uptr_t _lower;
 225                                         compat_uptr_t _upper;
 226                                 } _addr_bnd;
 227                                 /* used when si_code=SEGV_PKUERR */
 228                                 struct {
 229                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
 230                                         u32 _pkey;
 231                                 } _addr_pkey;
 232                                 /* used when si_code=TRAP_PERF */
 233                                 struct {
 234                                         compat_ulong_t _data;
 235                                         u32 _type;
 236                                         u32 _flags;
 237                                 } _perf;
 238                         };
 239                 } _sigfault;
 240
 241                 /* SIGPOLL */
 242                 struct {
 243                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 244                         int _fd;
 245                 } _sigpoll;
 246
 247                 struct {
 248                         compat_uptr_t _call_addr; /* calling user insn */
 249                         int _syscall;   /* triggering system call number */
 250                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 251                 } _sigsys;
 252         } _sifields;
 253 } compat_siginfo_t;
 254
 255 struct compat_rlimit {
 256         compat_ulong_t  rlim_cur;
 257         compat_ulong_t  rlim_max;
 258 };
 259
 260 #ifdef __ARCH_NEED_COMPAT_FLOCK64_PACKED
 261 #define __ARCH_COMPAT_FLOCK64_PACK      __attribute__((packed))
 262 #else
 263 #define __ARCH_COMPAT_FLOCK64_PACK
 264 #endif
 265
 266 struct compat_flock {
 267         short                   l_type;
 268         short                   l_whence;
 269         compat_off_t            l_start;
 270         compat_off_t            l_len;
 271 #ifdef __ARCH_COMPAT_FLOCK_EXTRA_SYSID
 272         __ARCH_COMPAT_FLOCK_EXTRA_SYSID
 273 #endif
 274         compat_pid_t            l_pid;
 275 #ifdef __ARCH_COMPAT_FLOCK_PAD
 276         __ARCH_COMPAT_FLOCK_PAD
 277 #endif
 278 };
 279
 280 struct compat_flock64 {
 281         short           l_type;
 282         short           l_whence;
 283         compat_loff_t   l_start;
 284         compat_loff_t   l_len;
 285         compat_pid_t    l_pid;
 286 #ifdef __ARCH_COMPAT_FLOCK64_PAD
 287         __ARCH_COMPAT_FLOCK64_PAD
 288 #endif
 289 } __ARCH_COMPAT_FLOCK64_PACK;
 290
 291 struct compat_rusage {
 292         struct old_timeval32 ru_utime;
 293         struct old_timeval32 ru_stime;
 294         compat_long_t   ru_maxrss;
 295         compat_long_t   ru_ixrss;
 296         compat_long_t   ru_idrss;
 297         compat_long_t   ru_isrss;
 298         compat_long_t   ru_minflt;
 299         compat_long_t   ru_majflt;
 300         compat_long_t   ru_nswap;
 301         compat_long_t   ru_inblock;
 302         compat_long_t   ru_oublock;
 303         compat_long_t   ru_msgsnd;
 304         compat_long_t   ru_msgrcv;
 305         compat_long_t   ru_nsignals;
 306         compat_long_t   ru_nvcsw;
 307         compat_long_t   ru_nivcsw;
 308 };
 309
 310 extern int put_compat_rusage(const struct rusage *,
 311                              struct compat_rusage __user *);
 312
 313 struct compat_siginfo;
 314 struct __compat_aio_sigset;
 315
 316 struct compat_dirent {
 317         u32             d_ino;
 318         compat_off_t    d_off;
 319         u16             d_reclen;
 320         char            d_name[256];
 321 };
 322
 323 struct compat_ustat {
 324         compat_daddr_t          f_tfree;
 325         compat_ino_t            f_tinode;
 326         char                    f_fname[6];
 327         char                    f_fpack[6];
 328 };
 329
 330 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 331
 332 typedef struct compat_sigevent {
 333         compat_sigval_t sigev_value;
 334         compat_int_t sigev_signo;
 335         compat_int_t sigev_notify;
 336         union {
 337                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 338                 compat_int_t _tid;
 339
 340                 struct {
 341                         compat_uptr_t _function;
 342                         compat_uptr_t _attribute;
 343                 } _sigev_thread;
 344         } _sigev_un;
 345 } compat_sigevent_t;
 346
 347 struct compat_ifmap {
 348         compat_ulong_t mem_start;
 349         compat_ulong_t mem_end;
 350         unsigned short base_addr;
 351         unsigned char irq;
 352         unsigned char dma;
 353         unsigned char port;
 354 };
 355
 356 struct compat_if_settings {
 357         unsigned int type;      /* Type of physical device or protocol */
 358         unsigned int size;      /* Size of the data allocated by the caller */
 359         compat_uptr_t ifs_ifsu; /* union of pointers */
 360 };
 361
 362 struct compat_ifreq {
 363         union {
 364                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 365         } ifr_ifrn;
 366         union {
 367                 struct  sockaddr ifru_addr;
 368                 struct  sockaddr ifru_dstaddr;
 369                 struct  sockaddr ifru_broadaddr;
 370                 struct  sockaddr ifru_netmask;
 371                 struct  sockaddr ifru_hwaddr;
 372                 short   ifru_flags;
 373                 compat_int_t    ifru_ivalue;
 374                 compat_int_t    ifru_mtu;
 375                 struct  compat_ifmap ifru_map;
 376                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 377                 char    ifru_newname[IFNAMSIZ];
 378                 compat_caddr_t  ifru_data;
 379                 struct  compat_if_settings ifru_settings;
 380         } ifr_ifru;
 381 };
 382
 383 struct compat_ifconf {
 384         compat_int_t    ifc_len;                /* size of buffer */
 385         compat_caddr_t  ifcbuf;
 386 };
 387
 388 struct compat_robust_list {
 389         compat_uptr_t                   next;
 390 };
 391
 392 struct compat_robust_list_head {
 393         struct compat_robust_list       list;
 394         compat_long_t                   futex_offset;
 395         compat_uptr_t                   list_op_pending;
 396 };
 397
 398 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 399 struct compat_old_sigaction {
 400         compat_uptr_t                   sa_handler;
 401         compat_old_sigset_t             sa_mask;
 402         compat_ulong_t                  sa_flags;
 403         compat_uptr_t                   sa_restorer;
 404 };
 405 #endif
 406
 407 struct compat_keyctl_kdf_params {
 408         compat_uptr_t hashname;
 409         compat_uptr_t otherinfo;
 410         __u32 otherinfolen;
 411         __u32 __spare[8];
 412 };
 413
 414 struct compat_stat;
 415 struct compat_statfs;
 416 struct compat_statfs64;
 417 struct compat_old_linux_dirent;
 418 struct compat_linux_dirent;
 419 struct linux_dirent64;
 420 struct compat_msghdr;
 421 struct compat_mmsghdr;
 422 struct compat_sysinfo;
 423 struct compat_sysctl_args;
 424 struct compat_kexec_segment;
 425 struct compat_mq_attr;
 426 struct compat_msgbuf;
 427
 428 void copy_siginfo_to_external32(struct compat_siginfo *to,
 429                 const struct kernel_siginfo *from);
 430 int copy_siginfo_from_user32(kernel_siginfo_t *to,
 431                 const struct compat_siginfo __user *from);
 432 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
 433                 const kernel_siginfo_t *from);
 434 #ifndef copy_siginfo_to_user32
 435 #define copy_siginfo_to_user32 __copy_siginfo_to_user32
 436 #endif
 437 int get_compat_sigevent(struct sigevent *event,
 438                 const struct compat_sigevent __user *u_event);
 439
 440 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 441
 442 /*
 443  * Defined inline such that size can be compile time constant, which avoids
 444  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 445  */
 446 static inline int
 447 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 448                   unsigned int size)
 449 {
 450         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 451 #if defined(__BIG_ENDIAN) && defined(CONFIG_64BIT)
 452         compat_sigset_t v;
 453         switch (_NSIG_WORDS) {
 454         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 455                 fallthrough;
 456         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 457                 fallthrough;
 458         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 459                 fallthrough;
 460         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 461         }
 462         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 463 #else
 464         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 465 #endif
 466 }
 467
 468 #ifdef CONFIG_CPU_BIG_ENDIAN
 469 #define unsafe_put_compat_sigset(compat, set, label) do {               \
 470         compat_sigset_t __user *__c = compat;                           \
 471         const sigset_t *__s = set;                                      \
 472                                                                         \
 473         switch (_NSIG_WORDS) {                                          \
 474         case 4:                                                         \
 475                 unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label);        \
 476                 unsafe_put_user(__s->sig[3], &__c->sig[6], label);      \
 477                 fallthrough;                                            \
 478         case 3:                                                         \
 479                 unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label);        \
 480                 unsafe_put_user(__s->sig[2], &__c->sig[4], label);      \
 481                 fallthrough;                                            \
 482         case 2:                                                         \
 483                 unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label);        \
 484                 unsafe_put_user(__s->sig[1], &__c->sig[2], label);      \
 485                 fallthrough;                                            \
 486         case 1:                                                         \
 487                 unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label);        \
 488                 unsafe_put_user(__s->sig[0], &__c->sig[0], label);      \
 489         }                                                               \
 490 } while (0)
 491
 492 #define unsafe_get_compat_sigset(set, compat, label) do {               \
 493         const compat_sigset_t __user *__c = compat;                     \
 494         compat_sigset_word hi, lo;                                      \
 495         sigset_t *__s = set;                                            \
 496                                                                         \
 497         switch (_NSIG_WORDS) {                                          \
 498         case 4:                                                         \
 499                 unsafe_get_user(lo, &__c->sig[7], label);               \
 500                 unsafe_get_user(hi, &__c->sig[6], label);               \
 501                 __s->sig[3] = hi | (((long)lo) << 32);                  \
 502                 fallthrough;                                            \
 503         case 3:                                                         \
 504                 unsafe_get_user(lo, &__c->sig[5], label);               \
 505                 unsafe_get_user(hi, &__c->sig[4], label);               \
 506                 __s->sig[2] = hi | (((long)lo) << 32);                  \
 507                 fallthrough;                                            \
 508         case 2:                                                         \
 509                 unsafe_get_user(lo, &__c->sig[3], label);               \
 510                 unsafe_get_user(hi, &__c->sig[2], label);               \
 511                 __s->sig[1] = hi | (((long)lo) << 32);                  \
 512                 fallthrough;                                            \
 513         case 1:                                                         \
 514                 unsafe_get_user(lo, &__c->sig[1], label);               \
 515                 unsafe_get_user(hi, &__c->sig[0], label);               \
 516                 __s->sig[0] = hi | (((long)lo) << 32);                  \
 517         }                                                               \
 518 } while (0)
 519 #else
 520 #define unsafe_put_compat_sigset(compat, set, label) do {               \
 521         compat_sigset_t __user *__c = compat;                           \
 522         const sigset_t *__s = set;                                      \
 523                                                                         \
 524         unsafe_copy_to_user(__c, __s, sizeof(*__c), label);             \
 525 } while (0)
 526
 527 #define unsafe_get_compat_sigset(set, compat, label) do {               \
 528         const compat_sigset_t __user *__c = compat;                     \
 529         sigset_t *__s = set;                                            \
 530                                                                         \
 531         unsafe_copy_from_user(__s, __c, sizeof(*__c), label);           \
 532 } while (0)
 533 #endif
 534
 535 extern int compat_ptrace_request(struct task_struct *child,
 536                                  compat_long_t request,
 537                                  compat_ulong_t addr, compat_ulong_t data);
 538
 539 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 540                                compat_ulong_t addr, compat_ulong_t data);
 541
 542 struct epoll_event;     /* fortunately, this one is fixed-layout */
 543
 544 int compat_restore_altstack(const compat_stack_t __user *uss);
 545 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 546 #define unsafe_compat_save_altstack(uss, sp, label) do { \
 547         compat_stack_t __user *__uss = uss; \
 548         struct task_struct *t = current; \
 549         unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
 550                         &__uss->ss_sp, label); \
 551         unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
 552         unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
 553 } while (0);
 554
 555 /*
 556  * These syscall function prototypes are kept in the same order as
 557  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 558  * go below.
 559  *
 560  * Please note that these prototypes here are only provided for information
 561  * purposes, for static analysis, and for linking from the syscall table.
 562  * These functions should not be called elsewhere from kernel code.
 563  *
 564  * As the syscall calling convention may be different from the default
 565  * for architectures overriding the syscall calling convention, do not
 566  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 567  */
 568 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 569 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 570 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 571                                      u32 __user *iocb);
 572 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 573                                         compat_long_t min_nr,
 574                                         compat_long_t nr,
 575                                         struct io_event __user *events,
 576                                         struct old_timespec32 __user *timeout,
 577                                         const struct __compat_aio_sigset __user *usig);
 578 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 579                                         compat_long_t min_nr,
 580                                         compat_long_t nr,
 581                                         struct io_event __user *events,
 582                                         struct __kernel_timespec __user *timeout,
 583                                         const struct __compat_aio_sigset __user *usig);
 584 asmlinkage long compat_sys_epoll_pwait(int epfd,
 585                         struct epoll_event __user *events,
 586                         int maxevents, int timeout,
 587                         const compat_sigset_t __user *sigmask,
 588                         compat_size_t sigsetsize);
 589 asmlinkage long compat_sys_epoll_pwait2(int epfd,
 590                         struct epoll_event __user *events,
 591                         int maxevents,
 592                         const struct __kernel_timespec __user *timeout,
 593                         const compat_sigset_t __user *sigmask,
 594                         compat_size_t sigsetsize);
 595 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 596                                  compat_ulong_t arg);
 597 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 598                                    compat_ulong_t arg);
 599 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 600                                  compat_ulong_t arg);
 601 asmlinkage long compat_sys_statfs(const char __user *pathname,
 602                                   struct compat_statfs __user *buf);
 603 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 604                                     compat_size_t sz,
 605                                     struct compat_statfs64 __user *buf);
 606 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 607                                    struct compat_statfs __user *buf);
 608 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 609                                      struct compat_statfs64 __user *buf);
 610 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 611 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 612 /* No generic prototype for truncate64, ftruncate64, fallocate */
 613 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 614                                   int flags, umode_t mode);
 615 asmlinkage long compat_sys_getdents(unsigned int fd,
 616                                     struct compat_linux_dirent __user *dirent,
 617                                     unsigned int count);
 618 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 619 /* No generic prototype for pread64 and pwrite64 */
 620 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 621                 const struct iovec __user *vec,
 622                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 623 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 624                 const struct iovec __user *vec,
 625                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 626 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 627 asmlinkage long compat_sys_preadv64(unsigned long fd,
 628                 const struct iovec __user *vec,
 629                 unsigned long vlen, loff_t pos);
 630 #endif
 631
 632 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 633 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 634                 const struct iovec __user *vec,
 635                 unsigned long vlen, loff_t pos);
 636 #endif
 637 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 638                                     compat_off_t __user *offset, compat_size_t count);
 639 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 640                                     compat_loff_t __user *offset, compat_size_t count);
 641 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 642                                     compat_ulong_t __user *outp,
 643                                     compat_ulong_t __user *exp,
 644                                     struct old_timespec32 __user *tsp,
 645                                     void __user *sig);
 646 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 647                                     compat_ulong_t __user *outp,
 648                                     compat_ulong_t __user *exp,
 649                                     struct __kernel_timespec __user *tsp,
 650                                     void __user *sig);
 651 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 652                                  unsigned int nfds,
 653                                  struct old_timespec32 __user *tsp,
 654                                  const compat_sigset_t __user *sigmask,
 655                                  compat_size_t sigsetsize);
 656 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 657                                  unsigned int nfds,
 658                                  struct __kernel_timespec __user *tsp,
 659                                  const compat_sigset_t __user *sigmask,
 660                                  compat_size_t sigsetsize);
 661 asmlinkage long compat_sys_signalfd4(int ufd,
 662                                      const compat_sigset_t __user *sigmask,
 663                                      compat_size_t sigsetsize, int flags);
 664 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 665                                       const char __user *filename,
 666                                       struct compat_stat __user *statbuf,
 667                                       int flag);
 668 asmlinkage long compat_sys_newfstat(unsigned int fd,
 669                                     struct compat_stat __user *statbuf);
 670 /* No generic prototype for sync_file_range and sync_file_range2 */
 671 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 672                 struct compat_siginfo __user *, int,
 673                 struct compat_rusage __user *);
 674 asmlinkage long
 675 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 676                            compat_size_t len);
 677 asmlinkage long
 678 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 679                            compat_size_t __user *len_ptr);
 680 asmlinkage long compat_sys_getitimer(int which,
 681                                      struct old_itimerval32 __user *it);
 682 asmlinkage long compat_sys_setitimer(int which,
 683                                      struct old_itimerval32 __user *in,
 684                                      struct old_itimerval32 __user *out);
 685 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 686                                       compat_ulong_t nr_segments,
 687                                       struct compat_kexec_segment __user *,
 688                                       compat_ulong_t flags);
 689 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 690                         struct compat_sigevent __user *timer_event_spec,
 691                         timer_t __user *created_timer_id);
 692 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 693                                   compat_long_t addr, compat_long_t data);
 694 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 695                                      unsigned int len,
 696                                      compat_ulong_t __user *user_mask_ptr);
 697 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 698                                      unsigned int len,
 699                                      compat_ulong_t __user *user_mask_ptr);
 700 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 701                                        compat_stack_t __user *uoss_ptr);
 702 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 703                                          compat_size_t sigsetsize);
 704 #ifndef CONFIG_ODD_RT_SIGACTION
 705 asmlinkage long compat_sys_rt_sigaction(int,
 706                                  const struct compat_sigaction __user *,
 707                                  struct compat_sigaction __user *,
 708                                  compat_size_t);
 709 #endif
 710 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 711                                           compat_sigset_t __user *oset,
 712                                           compat_size_t sigsetsize);
 713 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 714                                          compat_size_t sigsetsize);
 715 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 716                 struct compat_siginfo __user *uinfo,
 717                 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 718 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 719                 struct compat_siginfo __user *uinfo,
 720                 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 721 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 722                                 struct compat_siginfo __user *uinfo);
 723 /* No generic prototype for rt_sigreturn */
 724 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 725 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 726                                      struct compat_rlimit __user *rlim);
 727 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 728                                      struct compat_rlimit __user *rlim);
 729 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 730 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 731                 struct timezone __user *tz);
 732 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 733                 struct timezone __user *tz);
 734 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 735 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 736                         int oflag, compat_mode_t mode,
 737                         struct compat_mq_attr __user *u_attr);
 738 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 739                         const struct compat_sigevent __user *u_notification);
 740 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 741                         const struct compat_mq_attr __user *u_mqstat,
 742                         struct compat_mq_attr __user *u_omqstat);
 743 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 744 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 745                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 746 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 747                 compat_ssize_t msgsz, int msgflg);
 748 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 749 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 750 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 751 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 752                             unsigned flags, struct sockaddr __user *addr,
 753                             int __user *addrlen);
 754 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 755                                    unsigned flags);
 756 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 757                                    unsigned int flags);
 758 /* No generic prototype for readahead */
 759 asmlinkage long compat_sys_keyctl(u32 option,
 760                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 761 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 762                      const compat_uptr_t __user *envp);
 763 /* No generic prototype for fadvise64_64 */
 764 /* CONFIG_MMU only */
 765 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 766                                         compat_pid_t pid, int sig,
 767                                         struct compat_siginfo __user *uinfo);
 768 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 769                                     unsigned vlen, unsigned int flags,
 770                                     struct __kernel_timespec __user *timeout);
 771 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 772                                     unsigned vlen, unsigned int flags,
 773                                     struct old_timespec32 __user *timeout);
 774 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 775                                  compat_uint_t __user *stat_addr, int options,
 776                                  struct compat_rusage __user *ru);
 777 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 778                                             int, const char __user *);
 779 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 780                                              struct file_handle __user *handle,
 781                                              int flags);
 782 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 783                                     unsigned vlen, unsigned int flags);
 784 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 785                      const compat_uptr_t __user *argv,
 786                      const compat_uptr_t __user *envp, int flags);
 787 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 788                 const struct iovec __user *vec,
 789                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 790 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 791                 const struct iovec __user *vec,
 792                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 793 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 794 asmlinkage long  compat_sys_preadv64v2(unsigned long fd,
 795                 const struct iovec __user *vec,
 796                 unsigned long vlen, loff_t pos, rwf_t flags);
 797 #endif
 798
 799 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 800 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 801                 const struct iovec __user *vec,
 802                 unsigned long vlen, loff_t pos, rwf_t flags);
 803 #endif
 804
 805
 806 /*
 807  * Deprecated system calls which are still defined in
 808  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 809  */
 810
 811 /* __ARCH_WANT_SYSCALL_NO_AT */
 812 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 813                                 umode_t mode);
 814
 815 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 816 asmlinkage long compat_sys_signalfd(int ufd,
 817                                     const compat_sigset_t __user *sigmask,
 818                                     compat_size_t sigsetsize);
 819
 820 /* __ARCH_WANT_SYSCALL_OFF_T */
 821 asmlinkage long compat_sys_newstat(const char __user *filename,
 822                                    struct compat_stat __user *statbuf);
 823 asmlinkage long compat_sys_newlstat(const char __user *filename,
 824                                     struct compat_stat __user *statbuf);
 825
 826 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 827 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 828                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 829                 struct old_timeval32 __user *tvp);
 830 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 831 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 832                                 unsigned flags);
 833
 834 /* obsolete */
 835 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 836                                        struct compat_old_linux_dirent __user *,
 837                                        unsigned int count);
 838
 839 /* obsolete */
 840 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 841
 842 /* obsolete */
 843 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 844
 845 /* obsolete */
 846 #ifdef __ARCH_WANT_SYS_SIGPENDING
 847 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 848 #endif
 849
 850 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 851 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 852                                        compat_old_sigset_t __user *oset);
 853 #endif
 854 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 855 asmlinkage long compat_sys_sigaction(int sig,
 856                                    const struct compat_old_sigaction __user *act,
 857                                    struct compat_old_sigaction __user *oact);
 858 #endif
 859
 860 /* obsolete */
 861 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 862
 863 #ifdef __ARCH_WANT_COMPAT_TRUNCATE64
 864 asmlinkage long compat_sys_truncate64(const char __user *pathname, compat_arg_u64(len));
 865 #endif
 866
 867 #ifdef __ARCH_WANT_COMPAT_FTRUNCATE64
 868 asmlinkage long compat_sys_ftruncate64(unsigned int fd, compat_arg_u64(len));
 869 #endif
 870
 871 #ifdef __ARCH_WANT_COMPAT_FALLOCATE
 872 asmlinkage long compat_sys_fallocate(int fd, int mode, compat_arg_u64(offset),
 873                                      compat_arg_u64(len));
 874 #endif
 875
 876 #ifdef __ARCH_WANT_COMPAT_PREAD64
 877 asmlinkage long compat_sys_pread64(unsigned int fd, char __user *buf, size_t count,
 878                                    compat_arg_u64(pos));
 879 #endif
 880
 881 #ifdef __ARCH_WANT_COMPAT_PWRITE64
 882 asmlinkage long compat_sys_pwrite64(unsigned int fd, const char __user *buf, size_t count,
 883                                     compat_arg_u64(pos));
 884 #endif
 885
 886 #ifdef __ARCH_WANT_COMPAT_SYNC_FILE_RANGE
 887 asmlinkage long compat_sys_sync_file_range(int fd, compat_arg_u64(pos),
 888                                            compat_arg_u64(nbytes), unsigned int flags);
 889 #endif
 890
 891 #ifdef __ARCH_WANT_COMPAT_FADVISE64_64
 892 asmlinkage long compat_sys_fadvise64_64(int fd, compat_arg_u64(pos),
 893                                         compat_arg_u64(len), int advice);
 894 #endif
 895
 896 #ifdef __ARCH_WANT_COMPAT_READAHEAD
 897 asmlinkage long compat_sys_readahead(int fd, compat_arg_u64(offset), size_t count);
 898 #endif
 899
 900 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 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 #ifdef CONFIG_COMPAT
 932
 933 /*
 934  * For most but not all architectures, "am I in a compat syscall?" and
 935  * "am I a compat task?" are the same question.  For architectures on which
 936  * they aren't the same question, arch code can override in_compat_syscall.
 937  */
 938 #ifndef in_compat_syscall
 939 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 940 #endif
 941
 942 #else /* !CONFIG_COMPAT */
 943
 944 #define is_compat_task() (0)
 945 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
 946 #define in_compat_syscall in_compat_syscall
 947 static inline bool in_compat_syscall(void) { return false; }
 948
 949 #endif /* CONFIG_COMPAT */
 950
 951 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 952
 953 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 954
 955 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 956                        unsigned long bitmap_size);
 957 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 958                        unsigned long bitmap_size);
 959
 960 /*
 961  * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
 962  * types, and will need special compat treatment for that.  Most architectures
 963  * don't need that special handling even for compat syscalls.
 964  */
 965 #ifndef compat_need_64bit_alignment_fixup
 966 #define compat_need_64bit_alignment_fixup()             false
 967 #endif
 968
 969 /*
 970  * A pointer passed in from user mode. This should not
 971  * be used for syscall parameters, just declare them
 972  * as pointers because the syscall entry code will have
 973  * appropriately converted them already.
 974  */
 975 #ifndef compat_ptr
 976 static inline void __user *compat_ptr(compat_uptr_t uptr)
 977 {
 978         return (void __user *)(unsigned long)uptr;
 979 }
 980 #endif
 981
 982 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 983 {
 984         return (u32)(unsigned long)uptr;
 985 }
 986
 987 #endif /* _LINUX_COMPAT_H */