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 struct compat_iovec {
  95         compat_uptr_t   iov_base;
  96         compat_size_t   iov_len;
  97 };
  98
  99 #ifdef CONFIG_COMPAT
 100
 101 #ifndef compat_user_stack_pointer
 102 #define compat_user_stack_pointer() current_user_stack_pointer()
 103 #endif
 104 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
 105 typedef struct compat_sigaltstack {
 106         compat_uptr_t                   ss_sp;
 107         int                             ss_flags;
 108         compat_size_t                   ss_size;
 109 } compat_stack_t;
 110 #endif
 111 #ifndef COMPAT_MINSIGSTKSZ
 112 #define COMPAT_MINSIGSTKSZ      MINSIGSTKSZ
 113 #endif
 114
 115 #define compat_jiffies_to_clock_t(x)    \
 116                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
 117
 118 typedef __compat_uid32_t        compat_uid_t;
 119 typedef __compat_gid32_t        compat_gid_t;
 120
 121 struct compat_sel_arg_struct;
 122 struct rusage;
 123
 124 struct old_itimerval32;
 125
 126 struct compat_tms {
 127         compat_clock_t          tms_utime;
 128         compat_clock_t          tms_stime;
 129         compat_clock_t          tms_cutime;
 130         compat_clock_t          tms_cstime;
 131 };
 132
 133 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 134
 135 typedef struct {
 136         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 137 } compat_sigset_t;
 138
 139 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
 140                             size_t sigsetsize);
 141
 142 struct compat_sigaction {
 143 #ifndef __ARCH_HAS_IRIX_SIGACTION
 144         compat_uptr_t                   sa_handler;
 145         compat_ulong_t                  sa_flags;
 146 #else
 147         compat_uint_t                   sa_flags;
 148         compat_uptr_t                   sa_handler;
 149 #endif
 150 #ifdef __ARCH_HAS_SA_RESTORER
 151         compat_uptr_t                   sa_restorer;
 152 #endif
 153         compat_sigset_t                 sa_mask __packed;
 154 };
 155
 156 typedef union compat_sigval {
 157         compat_int_t    sival_int;
 158         compat_uptr_t   sival_ptr;
 159 } compat_sigval_t;
 160
 161 typedef struct compat_siginfo {
 162         int si_signo;
 163 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
 164         int si_errno;
 165         int si_code;
 166 #else
 167         int si_code;
 168         int si_errno;
 169 #endif
 170
 171         union {
 172                 int _pad[128/sizeof(int) - 3];
 173
 174                 /* kill() */
 175                 struct {
 176                         compat_pid_t _pid;      /* sender's pid */
 177                         __compat_uid32_t _uid;  /* sender's uid */
 178                 } _kill;
 179
 180                 /* POSIX.1b timers */
 181                 struct {
 182                         compat_timer_t _tid;    /* timer id */
 183                         int _overrun;           /* overrun count */
 184                         compat_sigval_t _sigval;        /* same as below */
 185                 } _timer;
 186
 187                 /* POSIX.1b signals */
 188                 struct {
 189                         compat_pid_t _pid;      /* sender's pid */
 190                         __compat_uid32_t _uid;  /* sender's uid */
 191                         compat_sigval_t _sigval;
 192                 } _rt;
 193
 194                 /* SIGCHLD */
 195                 struct {
 196                         compat_pid_t _pid;      /* which child */
 197                         __compat_uid32_t _uid;  /* sender's uid */
 198                         int _status;            /* exit code */
 199                         compat_clock_t _utime;
 200                         compat_clock_t _stime;
 201                 } _sigchld;
 202
 203 #ifdef CONFIG_X86_X32_ABI
 204                 /* SIGCHLD (x32 version) */
 205                 struct {
 206                         compat_pid_t _pid;      /* which child */
 207                         __compat_uid32_t _uid;  /* sender's uid */
 208                         int _status;            /* exit code */
 209                         compat_s64 _utime;
 210                         compat_s64 _stime;
 211                 } _sigchld_x32;
 212 #endif
 213
 214                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 215                 struct {
 216                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
 217 #ifdef __ARCH_SI_TRAPNO
 218                         int _trapno;    /* TRAP # which caused the signal */
 219 #endif
 220 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 221                                      sizeof(short) : __alignof__(compat_uptr_t))
 222                         union {
 223                                 /*
 224                                  * used when si_code=BUS_MCEERR_AR or
 225                                  * used when si_code=BUS_MCEERR_AO
 226                                  */
 227                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
 228                                 /* used when si_code=SEGV_BNDERR */
 229                                 struct {
 230                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
 231                                         compat_uptr_t _lower;
 232                                         compat_uptr_t _upper;
 233                                 } _addr_bnd;
 234                                 /* used when si_code=SEGV_PKUERR */
 235                                 struct {
 236                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
 237                                         u32 _pkey;
 238                                 } _addr_pkey;
 239                                 /* used when si_code=TRAP_PERF */
 240                                 compat_ulong_t _perf;
 241                         };
 242                 } _sigfault;
 243
 244                 /* SIGPOLL */
 245                 struct {
 246                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 247                         int _fd;
 248                 } _sigpoll;
 249
 250                 struct {
 251                         compat_uptr_t _call_addr; /* calling user insn */
 252                         int _syscall;   /* triggering system call number */
 253                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 254                 } _sigsys;
 255         } _sifields;
 256 } compat_siginfo_t;
 257
 258 struct compat_rlimit {
 259         compat_ulong_t  rlim_cur;
 260         compat_ulong_t  rlim_max;
 261 };
 262
 263 struct compat_rusage {
 264         struct old_timeval32 ru_utime;
 265         struct old_timeval32 ru_stime;
 266         compat_long_t   ru_maxrss;
 267         compat_long_t   ru_ixrss;
 268         compat_long_t   ru_idrss;
 269         compat_long_t   ru_isrss;
 270         compat_long_t   ru_minflt;
 271         compat_long_t   ru_majflt;
 272         compat_long_t   ru_nswap;
 273         compat_long_t   ru_inblock;
 274         compat_long_t   ru_oublock;
 275         compat_long_t   ru_msgsnd;
 276         compat_long_t   ru_msgrcv;
 277         compat_long_t   ru_nsignals;
 278         compat_long_t   ru_nvcsw;
 279         compat_long_t   ru_nivcsw;
 280 };
 281
 282 extern int put_compat_rusage(const struct rusage *,
 283                              struct compat_rusage __user *);
 284
 285 struct compat_siginfo;
 286 struct __compat_aio_sigset;
 287
 288 struct compat_dirent {
 289         u32             d_ino;
 290         compat_off_t    d_off;
 291         u16             d_reclen;
 292         char            d_name[256];
 293 };
 294
 295 struct compat_ustat {
 296         compat_daddr_t          f_tfree;
 297         compat_ino_t            f_tinode;
 298         char                    f_fname[6];
 299         char                    f_fpack[6];
 300 };
 301
 302 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 303
 304 typedef struct compat_sigevent {
 305         compat_sigval_t sigev_value;
 306         compat_int_t sigev_signo;
 307         compat_int_t sigev_notify;
 308         union {
 309                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 310                 compat_int_t _tid;
 311
 312                 struct {
 313                         compat_uptr_t _function;
 314                         compat_uptr_t _attribute;
 315                 } _sigev_thread;
 316         } _sigev_un;
 317 } compat_sigevent_t;
 318
 319 struct compat_ifmap {
 320         compat_ulong_t mem_start;
 321         compat_ulong_t mem_end;
 322         unsigned short base_addr;
 323         unsigned char irq;
 324         unsigned char dma;
 325         unsigned char port;
 326 };
 327
 328 struct compat_if_settings {
 329         unsigned int type;      /* Type of physical device or protocol */
 330         unsigned int size;      /* Size of the data allocated by the caller */
 331         compat_uptr_t ifs_ifsu; /* union of pointers */
 332 };
 333
 334 struct compat_ifreq {
 335         union {
 336                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 337         } ifr_ifrn;
 338         union {
 339                 struct  sockaddr ifru_addr;
 340                 struct  sockaddr ifru_dstaddr;
 341                 struct  sockaddr ifru_broadaddr;
 342                 struct  sockaddr ifru_netmask;
 343                 struct  sockaddr ifru_hwaddr;
 344                 short   ifru_flags;
 345                 compat_int_t    ifru_ivalue;
 346                 compat_int_t    ifru_mtu;
 347                 struct  compat_ifmap ifru_map;
 348                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 349                 char    ifru_newname[IFNAMSIZ];
 350                 compat_caddr_t  ifru_data;
 351                 struct  compat_if_settings ifru_settings;
 352         } ifr_ifru;
 353 };
 354
 355 struct compat_ifconf {
 356         compat_int_t    ifc_len;                /* size of buffer */
 357         compat_caddr_t  ifcbuf;
 358 };
 359
 360 struct compat_robust_list {
 361         compat_uptr_t                   next;
 362 };
 363
 364 struct compat_robust_list_head {
 365         struct compat_robust_list       list;
 366         compat_long_t                   futex_offset;
 367         compat_uptr_t                   list_op_pending;
 368 };
 369
 370 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 371 struct compat_old_sigaction {
 372         compat_uptr_t                   sa_handler;
 373         compat_old_sigset_t             sa_mask;
 374         compat_ulong_t                  sa_flags;
 375         compat_uptr_t                   sa_restorer;
 376 };
 377 #endif
 378
 379 struct compat_keyctl_kdf_params {
 380         compat_uptr_t hashname;
 381         compat_uptr_t otherinfo;
 382         __u32 otherinfolen;
 383         __u32 __spare[8];
 384 };
 385
 386 struct compat_statfs;
 387 struct compat_statfs64;
 388 struct compat_old_linux_dirent;
 389 struct compat_linux_dirent;
 390 struct linux_dirent64;
 391 struct compat_msghdr;
 392 struct compat_mmsghdr;
 393 struct compat_sysinfo;
 394 struct compat_sysctl_args;
 395 struct compat_kexec_segment;
 396 struct compat_mq_attr;
 397 struct compat_msgbuf;
 398
 399 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 400
 401 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 402
 403 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 404                        unsigned long bitmap_size);
 405 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 406                        unsigned long bitmap_size);
 407 void copy_siginfo_to_external32(struct compat_siginfo *to,
 408                 const struct kernel_siginfo *from);
 409 int copy_siginfo_from_user32(kernel_siginfo_t *to,
 410                 const struct compat_siginfo __user *from);
 411 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
 412                 const kernel_siginfo_t *from);
 413 #ifndef copy_siginfo_to_user32
 414 #define copy_siginfo_to_user32 __copy_siginfo_to_user32
 415 #endif
 416 int get_compat_sigevent(struct sigevent *event,
 417                 const struct compat_sigevent __user *u_event);
 418
 419 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 420
 421 /*
 422  * Defined inline such that size can be compile time constant, which avoids
 423  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 424  */
 425 static inline int
 426 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 427                   unsigned int size)
 428 {
 429         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 430 #ifdef __BIG_ENDIAN
 431         compat_sigset_t v;
 432         switch (_NSIG_WORDS) {
 433         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 434                 fallthrough;
 435         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 436                 fallthrough;
 437         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 438                 fallthrough;
 439         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 440         }
 441         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 442 #else
 443         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 444 #endif
 445 }
 446
 447 #ifdef CONFIG_CPU_BIG_ENDIAN
 448 #define unsafe_put_compat_sigset(compat, set, label) do {               \
 449         compat_sigset_t __user *__c = compat;                           \
 450         const sigset_t *__s = set;                                      \
 451                                                                         \
 452         switch (_NSIG_WORDS) {                                          \
 453         case 4:                                                         \
 454                 unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label);        \
 455                 unsafe_put_user(__s->sig[3], &__c->sig[6], label);      \
 456                 fallthrough;                                            \
 457         case 3:                                                         \
 458                 unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label);        \
 459                 unsafe_put_user(__s->sig[2], &__c->sig[4], label);      \
 460                 fallthrough;                                            \
 461         case 2:                                                         \
 462                 unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label);        \
 463                 unsafe_put_user(__s->sig[1], &__c->sig[2], label);      \
 464                 fallthrough;                                            \
 465         case 1:                                                         \
 466                 unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label);        \
 467                 unsafe_put_user(__s->sig[0], &__c->sig[0], label);      \
 468         }                                                               \
 469 } while (0)
 470
 471 #define unsafe_get_compat_sigset(set, compat, label) do {               \
 472         const compat_sigset_t __user *__c = compat;                     \
 473         compat_sigset_word hi, lo;                                      \
 474         sigset_t *__s = set;                                            \
 475                                                                         \
 476         switch (_NSIG_WORDS) {                                          \
 477         case 4:                                                         \
 478                 unsafe_get_user(lo, &__c->sig[7], label);               \
 479                 unsafe_get_user(hi, &__c->sig[6], label);               \
 480                 __s->sig[3] = hi | (((long)lo) << 32);                  \
 481                 fallthrough;                                            \
 482         case 3:                                                         \
 483                 unsafe_get_user(lo, &__c->sig[5], label);               \
 484                 unsafe_get_user(hi, &__c->sig[4], label);               \
 485                 __s->sig[2] = hi | (((long)lo) << 32);                  \
 486                 fallthrough;                                            \
 487         case 2:                                                         \
 488                 unsafe_get_user(lo, &__c->sig[3], label);               \
 489                 unsafe_get_user(hi, &__c->sig[2], label);               \
 490                 __s->sig[1] = hi | (((long)lo) << 32);                  \
 491                 fallthrough;                                            \
 492         case 1:                                                         \
 493                 unsafe_get_user(lo, &__c->sig[1], label);               \
 494                 unsafe_get_user(hi, &__c->sig[0], label);               \
 495                 __s->sig[0] = hi | (((long)lo) << 32);                  \
 496         }                                                               \
 497 } while (0)
 498 #else
 499 #define unsafe_put_compat_sigset(compat, set, label) do {               \
 500         compat_sigset_t __user *__c = compat;                           \
 501         const sigset_t *__s = set;                                      \
 502                                                                         \
 503         unsafe_copy_to_user(__c, __s, sizeof(*__c), label);             \
 504 } while (0)
 505
 506 #define unsafe_get_compat_sigset(set, compat, label) do {               \
 507         const compat_sigset_t __user *__c = compat;                     \
 508         sigset_t *__s = set;                                            \
 509                                                                         \
 510         unsafe_copy_from_user(__s, __c, sizeof(*__c), label);           \
 511 } while (0)
 512 #endif
 513
 514 extern int compat_ptrace_request(struct task_struct *child,
 515                                  compat_long_t request,
 516                                  compat_ulong_t addr, compat_ulong_t data);
 517
 518 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 519                                compat_ulong_t addr, compat_ulong_t data);
 520
 521 struct epoll_event;     /* fortunately, this one is fixed-layout */
 522
 523 extern void __user *compat_alloc_user_space(unsigned long len);
 524
 525 int compat_restore_altstack(const compat_stack_t __user *uss);
 526 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 527 #define unsafe_compat_save_altstack(uss, sp, label) do { \
 528         compat_stack_t __user *__uss = uss; \
 529         struct task_struct *t = current; \
 530         unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
 531                         &__uss->ss_sp, label); \
 532         unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
 533         unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
 534         if (t->sas_ss_flags & SS_AUTODISARM) \
 535                 sas_ss_reset(t); \
 536 } while (0);
 537
 538 /*
 539  * These syscall function prototypes are kept in the same order as
 540  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 541  * go below.
 542  *
 543  * Please note that these prototypes here are only provided for information
 544  * purposes, for static analysis, and for linking from the syscall table.
 545  * These functions should not be called elsewhere from kernel code.
 546  *
 547  * As the syscall calling convention may be different from the default
 548  * for architectures overriding the syscall calling convention, do not
 549  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 550  */
 551 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 552 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 553 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 554                                      u32 __user *iocb);
 555 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 556                                         compat_long_t min_nr,
 557                                         compat_long_t nr,
 558                                         struct io_event __user *events,
 559                                         struct old_timespec32 __user *timeout,
 560                                         const struct __compat_aio_sigset __user *usig);
 561 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 562                                         compat_long_t min_nr,
 563                                         compat_long_t nr,
 564                                         struct io_event __user *events,
 565                                         struct __kernel_timespec __user *timeout,
 566                                         const struct __compat_aio_sigset __user *usig);
 567
 568 /* fs/cookies.c */
 569 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 570
 571 /* fs/eventpoll.c */
 572 asmlinkage long compat_sys_epoll_pwait(int epfd,
 573                         struct epoll_event __user *events,
 574                         int maxevents, int timeout,
 575                         const compat_sigset_t __user *sigmask,
 576                         compat_size_t sigsetsize);
 577 asmlinkage long compat_sys_epoll_pwait2(int epfd,
 578                         struct epoll_event __user *events,
 579                         int maxevents,
 580                         const struct __kernel_timespec __user *timeout,
 581                         const compat_sigset_t __user *sigmask,
 582                         compat_size_t sigsetsize);
 583
 584 /* fs/fcntl.c */
 585 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 586                                  compat_ulong_t arg);
 587 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 588                                    compat_ulong_t arg);
 589
 590 /* fs/ioctl.c */
 591 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 592                                  compat_ulong_t arg);
 593
 594 /* fs/open.c */
 595 asmlinkage long compat_sys_statfs(const char __user *pathname,
 596                                   struct compat_statfs __user *buf);
 597 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 598                                     compat_size_t sz,
 599                                     struct compat_statfs64 __user *buf);
 600 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 601                                    struct compat_statfs __user *buf);
 602 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 603                                      struct compat_statfs64 __user *buf);
 604 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 605 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 606 /* No generic prototype for truncate64, ftruncate64, fallocate */
 607 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 608                                   int flags, umode_t mode);
 609
 610 /* fs/readdir.c */
 611 asmlinkage long compat_sys_getdents(unsigned int fd,
 612                                     struct compat_linux_dirent __user *dirent,
 613                                     unsigned int count);
 614
 615 /* fs/read_write.c */
 616 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 617 /* No generic prototype for pread64 and pwrite64 */
 618 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 619                 const struct iovec __user *vec,
 620                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 621 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 622                 const struct iovec __user *vec,
 623                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 624 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 625 asmlinkage long compat_sys_preadv64(unsigned long fd,
 626                 const struct iovec __user *vec,
 627                 unsigned long vlen, loff_t pos);
 628 #endif
 629
 630 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 631 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 632                 const struct iovec __user *vec,
 633                 unsigned long vlen, loff_t pos);
 634 #endif
 635
 636 /* fs/sendfile.c */
 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
 642 /* fs/select.c */
 643 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 644                                     compat_ulong_t __user *outp,
 645                                     compat_ulong_t __user *exp,
 646                                     struct old_timespec32 __user *tsp,
 647                                     void __user *sig);
 648 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 649                                     compat_ulong_t __user *outp,
 650                                     compat_ulong_t __user *exp,
 651                                     struct __kernel_timespec __user *tsp,
 652                                     void __user *sig);
 653 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 654                                  unsigned int nfds,
 655                                  struct old_timespec32 __user *tsp,
 656                                  const compat_sigset_t __user *sigmask,
 657                                  compat_size_t sigsetsize);
 658 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 659                                  unsigned int nfds,
 660                                  struct __kernel_timespec __user *tsp,
 661                                  const compat_sigset_t __user *sigmask,
 662                                  compat_size_t sigsetsize);
 663
 664 /* fs/signalfd.c */
 665 asmlinkage long compat_sys_signalfd4(int ufd,
 666                                      const compat_sigset_t __user *sigmask,
 667                                      compat_size_t sigsetsize, int flags);
 668
 669 /* fs/stat.c */
 670 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 671                                       const char __user *filename,
 672                                       struct compat_stat __user *statbuf,
 673                                       int flag);
 674 asmlinkage long compat_sys_newfstat(unsigned int fd,
 675                                     struct compat_stat __user *statbuf);
 676
 677 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 678
 679 /* kernel/exit.c */
 680 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 681                 struct compat_siginfo __user *, int,
 682                 struct compat_rusage __user *);
 683
 684
 685
 686 /* kernel/futex.c */
 687 asmlinkage long
 688 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 689                            compat_size_t len);
 690 asmlinkage long
 691 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 692                            compat_size_t __user *len_ptr);
 693
 694 /* kernel/itimer.c */
 695 asmlinkage long compat_sys_getitimer(int which,
 696                                      struct old_itimerval32 __user *it);
 697 asmlinkage long compat_sys_setitimer(int which,
 698                                      struct old_itimerval32 __user *in,
 699                                      struct old_itimerval32 __user *out);
 700
 701 /* kernel/kexec.c */
 702 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 703                                       compat_ulong_t nr_segments,
 704                                       struct compat_kexec_segment __user *,
 705                                       compat_ulong_t flags);
 706
 707 /* kernel/posix-timers.c */
 708 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 709                         struct compat_sigevent __user *timer_event_spec,
 710                         timer_t __user *created_timer_id);
 711
 712 /* kernel/ptrace.c */
 713 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 714                                   compat_long_t addr, compat_long_t data);
 715
 716 /* kernel/sched/core.c */
 717 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 718                                      unsigned int len,
 719                                      compat_ulong_t __user *user_mask_ptr);
 720 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 721                                      unsigned int len,
 722                                      compat_ulong_t __user *user_mask_ptr);
 723
 724 /* kernel/signal.c */
 725 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 726                                        compat_stack_t __user *uoss_ptr);
 727 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 728                                          compat_size_t sigsetsize);
 729 #ifndef CONFIG_ODD_RT_SIGACTION
 730 asmlinkage long compat_sys_rt_sigaction(int,
 731                                  const struct compat_sigaction __user *,
 732                                  struct compat_sigaction __user *,
 733                                  compat_size_t);
 734 #endif
 735 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 736                                           compat_sigset_t __user *oset,
 737                                           compat_size_t sigsetsize);
 738 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 739                                          compat_size_t sigsetsize);
 740 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 741                 struct compat_siginfo __user *uinfo,
 742                 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 743 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 744                 struct compat_siginfo __user *uinfo,
 745                 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 746 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 747                                 struct compat_siginfo __user *uinfo);
 748 /* No generic prototype for rt_sigreturn */
 749
 750 /* kernel/sys.c */
 751 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 752 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 753                                      struct compat_rlimit __user *rlim);
 754 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 755                                      struct compat_rlimit __user *rlim);
 756 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 757
 758 /* kernel/time.c */
 759 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 760                 struct timezone __user *tz);
 761 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 762                 struct timezone __user *tz);
 763
 764 /* kernel/timer.c */
 765 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 766
 767 /* ipc/mqueue.c */
 768 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 769                         int oflag, compat_mode_t mode,
 770                         struct compat_mq_attr __user *u_attr);
 771 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 772                         const struct compat_sigevent __user *u_notification);
 773 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 774                         const struct compat_mq_attr __user *u_mqstat,
 775                         struct compat_mq_attr __user *u_omqstat);
 776
 777 /* ipc/msg.c */
 778 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 779 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 780                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 781 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 782                 compat_ssize_t msgsz, int msgflg);
 783
 784 /* ipc/sem.c */
 785 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 786
 787 /* ipc/shm.c */
 788 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 789 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 790
 791 /* net/socket.c */
 792 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 793                             unsigned flags, struct sockaddr __user *addr,
 794                             int __user *addrlen);
 795 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 796                                    unsigned flags);
 797 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 798                                    unsigned int flags);
 799
 800 /* mm/filemap.c: No generic prototype for readahead */
 801
 802 /* security/keys/keyctl.c */
 803 asmlinkage long compat_sys_keyctl(u32 option,
 804                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 805
 806 /* arch/example/kernel/sys_example.c */
 807 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 808                      const compat_uptr_t __user *envp);
 809
 810 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 811
 812 /* mm/, CONFIG_MMU only */
 813 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 814                                  compat_ulong_t mode,
 815                                  compat_ulong_t __user *nmask,
 816                                  compat_ulong_t maxnode, compat_ulong_t flags);
 817 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 818                                          compat_ulong_t __user *nmask,
 819                                          compat_ulong_t maxnode,
 820                                          compat_ulong_t addr,
 821                                          compat_ulong_t flags);
 822 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 823                                          compat_ulong_t maxnode);
 824 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 825                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 826                 const compat_ulong_t __user *new_nodes);
 827 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 828                                       __u32 __user *pages,
 829                                       const int __user *nodes,
 830                                       int __user *status,
 831                                       int flags);
 832
 833 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 834                                         compat_pid_t pid, int sig,
 835                                         struct compat_siginfo __user *uinfo);
 836 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 837                                     unsigned vlen, unsigned int flags,
 838                                     struct __kernel_timespec __user *timeout);
 839 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 840                                     unsigned vlen, unsigned int flags,
 841                                     struct old_timespec32 __user *timeout);
 842 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 843                                  compat_uint_t __user *stat_addr, int options,
 844                                  struct compat_rusage __user *ru);
 845 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 846                                             int, const char __user *);
 847 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 848                                              struct file_handle __user *handle,
 849                                              int flags);
 850 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 851                                     unsigned vlen, unsigned int flags);
 852 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 853                      const compat_uptr_t __user *argv,
 854                      const compat_uptr_t __user *envp, int flags);
 855 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 856                 const struct iovec __user *vec,
 857                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 858 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 859                 const struct iovec __user *vec,
 860                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 861 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 862 asmlinkage long  compat_sys_preadv64v2(unsigned long fd,
 863                 const struct iovec __user *vec,
 864                 unsigned long vlen, loff_t pos, rwf_t flags);
 865 #endif
 866
 867 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 868 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 869                 const struct iovec __user *vec,
 870                 unsigned long vlen, loff_t pos, rwf_t flags);
 871 #endif
 872
 873
 874 /*
 875  * Deprecated system calls which are still defined in
 876  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 877  */
 878
 879 /* __ARCH_WANT_SYSCALL_NO_AT */
 880 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 881                                 umode_t mode);
 882
 883 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 884 asmlinkage long compat_sys_signalfd(int ufd,
 885                                     const compat_sigset_t __user *sigmask,
 886                                     compat_size_t sigsetsize);
 887
 888 /* __ARCH_WANT_SYSCALL_OFF_T */
 889 asmlinkage long compat_sys_newstat(const char __user *filename,
 890                                    struct compat_stat __user *statbuf);
 891 asmlinkage long compat_sys_newlstat(const char __user *filename,
 892                                     struct compat_stat __user *statbuf);
 893
 894 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 895 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 896                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 897                 struct old_timeval32 __user *tvp);
 898 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 899 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 900                                 unsigned flags);
 901
 902 /* obsolete: fs/readdir.c */
 903 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 904                                        struct compat_old_linux_dirent __user *,
 905                                        unsigned int count);
 906
 907 /* obsolete: fs/select.c */
 908 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 909
 910 /* obsolete: ipc */
 911 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 912
 913 /* obsolete: kernel/signal.c */
 914 #ifdef __ARCH_WANT_SYS_SIGPENDING
 915 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 916 #endif
 917
 918 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 919 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 920                                        compat_old_sigset_t __user *oset);
 921 #endif
 922 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 923 asmlinkage long compat_sys_sigaction(int sig,
 924                                    const struct compat_old_sigaction __user *act,
 925                                    struct compat_old_sigaction __user *oact);
 926 #endif
 927
 928 /* obsolete: net/socket.c */
 929 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 930
 931 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 932
 933
 934 /*
 935  * For most but not all architectures, "am I in a compat syscall?" and
 936  * "am I a compat task?" are the same question.  For architectures on which
 937  * they aren't the same question, arch code can override in_compat_syscall.
 938  */
 939
 940 #ifndef in_compat_syscall
 941 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 942 #endif
 943
 944 /**
 945  * ns_to_old_timeval32 - Compat version of ns_to_timeval
 946  * @nsec:       the nanoseconds value to be converted
 947  *
 948  * Returns the old_timeval32 representation of the nsec parameter.
 949  */
 950 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
 951 {
 952         struct __kernel_old_timeval tv;
 953         struct old_timeval32 ctv;
 954
 955         tv = ns_to_kernel_old_timeval(nsec);
 956         ctv.tv_sec = tv.tv_sec;
 957         ctv.tv_usec = tv.tv_usec;
 958
 959         return ctv;
 960 }
 961
 962 /*
 963  * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 964  * directly.  Instead, use one of the functions which work equivalently, such
 965  * as the kcompat_sys_xyzyyz() functions prototyped below.
 966  */
 967
 968 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 969                      struct compat_statfs64 __user * buf);
 970 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 971                           struct compat_statfs64 __user * buf);
 972
 973 #else /* !CONFIG_COMPAT */
 974
 975 #define is_compat_task() (0)
 976 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
 977 #define in_compat_syscall in_compat_syscall
 978 static inline bool in_compat_syscall(void) { return false; }
 979
 980 #endif /* CONFIG_COMPAT */
 981
 982 /*
 983  * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
 984  * types, and will need special compat treatment for that.  Most architectures
 985  * don't need that special handling even for compat syscalls.
 986  */
 987 #ifndef compat_need_64bit_alignment_fixup
 988 #define compat_need_64bit_alignment_fixup()             false
 989 #endif
 990
 991 /*
 992  * A pointer passed in from user mode. This should not
 993  * be used for syscall parameters, just declare them
 994  * as pointers because the syscall entry code will have
 995  * appropriately converted them already.
 996  */
 997 #ifndef compat_ptr
 998 static inline void __user *compat_ptr(compat_uptr_t uptr)
 999 {
1000         return (void __user *)(unsigned long)uptr;
1001 }
1002 #endif
1003
1004 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
1005 {
1006         return (u32)(unsigned long)uptr;
1007 }
1008
1009 #endif /* _LINUX_COMPAT_H */