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                         };
 240                 } _sigfault;
 241
 242                 /* SIGPOLL */
 243                 struct {
 244                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 245                         int _fd;
 246                 } _sigpoll;
 247
 248                 struct {
 249                         compat_uptr_t _call_addr; /* calling user insn */
 250                         int _syscall;   /* triggering system call number */
 251                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 252                 } _sigsys;
 253         } _sifields;
 254 } compat_siginfo_t;
 255
 256 struct compat_rlimit {
 257         compat_ulong_t  rlim_cur;
 258         compat_ulong_t  rlim_max;
 259 };
 260
 261 struct compat_rusage {
 262         struct old_timeval32 ru_utime;
 263         struct old_timeval32 ru_stime;
 264         compat_long_t   ru_maxrss;
 265         compat_long_t   ru_ixrss;
 266         compat_long_t   ru_idrss;
 267         compat_long_t   ru_isrss;
 268         compat_long_t   ru_minflt;
 269         compat_long_t   ru_majflt;
 270         compat_long_t   ru_nswap;
 271         compat_long_t   ru_inblock;
 272         compat_long_t   ru_oublock;
 273         compat_long_t   ru_msgsnd;
 274         compat_long_t   ru_msgrcv;
 275         compat_long_t   ru_nsignals;
 276         compat_long_t   ru_nvcsw;
 277         compat_long_t   ru_nivcsw;
 278 };
 279
 280 extern int put_compat_rusage(const struct rusage *,
 281                              struct compat_rusage __user *);
 282
 283 struct compat_siginfo;
 284 struct __compat_aio_sigset;
 285
 286 struct compat_dirent {
 287         u32             d_ino;
 288         compat_off_t    d_off;
 289         u16             d_reclen;
 290         char            d_name[256];
 291 };
 292
 293 struct compat_ustat {
 294         compat_daddr_t          f_tfree;
 295         compat_ino_t            f_tinode;
 296         char                    f_fname[6];
 297         char                    f_fpack[6];
 298 };
 299
 300 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 301
 302 typedef struct compat_sigevent {
 303         compat_sigval_t sigev_value;
 304         compat_int_t sigev_signo;
 305         compat_int_t sigev_notify;
 306         union {
 307                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 308                 compat_int_t _tid;
 309
 310                 struct {
 311                         compat_uptr_t _function;
 312                         compat_uptr_t _attribute;
 313                 } _sigev_thread;
 314         } _sigev_un;
 315 } compat_sigevent_t;
 316
 317 struct compat_ifmap {
 318         compat_ulong_t mem_start;
 319         compat_ulong_t mem_end;
 320         unsigned short base_addr;
 321         unsigned char irq;
 322         unsigned char dma;
 323         unsigned char port;
 324 };
 325
 326 struct compat_if_settings {
 327         unsigned int type;      /* Type of physical device or protocol */
 328         unsigned int size;      /* Size of the data allocated by the caller */
 329         compat_uptr_t ifs_ifsu; /* union of pointers */
 330 };
 331
 332 struct compat_ifreq {
 333         union {
 334                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 335         } ifr_ifrn;
 336         union {
 337                 struct  sockaddr ifru_addr;
 338                 struct  sockaddr ifru_dstaddr;
 339                 struct  sockaddr ifru_broadaddr;
 340                 struct  sockaddr ifru_netmask;
 341                 struct  sockaddr ifru_hwaddr;
 342                 short   ifru_flags;
 343                 compat_int_t    ifru_ivalue;
 344                 compat_int_t    ifru_mtu;
 345                 struct  compat_ifmap ifru_map;
 346                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 347                 char    ifru_newname[IFNAMSIZ];
 348                 compat_caddr_t  ifru_data;
 349                 struct  compat_if_settings ifru_settings;
 350         } ifr_ifru;
 351 };
 352
 353 struct compat_ifconf {
 354         compat_int_t    ifc_len;                /* size of buffer */
 355         compat_caddr_t  ifcbuf;
 356 };
 357
 358 struct compat_robust_list {
 359         compat_uptr_t                   next;
 360 };
 361
 362 struct compat_robust_list_head {
 363         struct compat_robust_list       list;
 364         compat_long_t                   futex_offset;
 365         compat_uptr_t                   list_op_pending;
 366 };
 367
 368 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 369 struct compat_old_sigaction {
 370         compat_uptr_t                   sa_handler;
 371         compat_old_sigset_t             sa_mask;
 372         compat_ulong_t                  sa_flags;
 373         compat_uptr_t                   sa_restorer;
 374 };
 375 #endif
 376
 377 struct compat_keyctl_kdf_params {
 378         compat_uptr_t hashname;
 379         compat_uptr_t otherinfo;
 380         __u32 otherinfolen;
 381         __u32 __spare[8];
 382 };
 383
 384 struct compat_statfs;
 385 struct compat_statfs64;
 386 struct compat_old_linux_dirent;
 387 struct compat_linux_dirent;
 388 struct linux_dirent64;
 389 struct compat_msghdr;
 390 struct compat_mmsghdr;
 391 struct compat_sysinfo;
 392 struct compat_sysctl_args;
 393 struct compat_kexec_segment;
 394 struct compat_mq_attr;
 395 struct compat_msgbuf;
 396
 397 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 398
 399 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 400
 401 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 402                        unsigned long bitmap_size);
 403 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 404                        unsigned long bitmap_size);
 405 void copy_siginfo_to_external32(struct compat_siginfo *to,
 406                 const struct kernel_siginfo *from);
 407 int copy_siginfo_from_user32(kernel_siginfo_t *to,
 408                 const struct compat_siginfo __user *from);
 409 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
 410                 const kernel_siginfo_t *from);
 411 #ifndef copy_siginfo_to_user32
 412 #define copy_siginfo_to_user32 __copy_siginfo_to_user32
 413 #endif
 414 int get_compat_sigevent(struct sigevent *event,
 415                 const struct compat_sigevent __user *u_event);
 416
 417 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 418
 419 /*
 420  * Defined inline such that size can be compile time constant, which avoids
 421  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 422  */
 423 static inline int
 424 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 425                   unsigned int size)
 426 {
 427         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 428 #ifdef __BIG_ENDIAN
 429         compat_sigset_t v;
 430         switch (_NSIG_WORDS) {
 431         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 432                 fallthrough;
 433         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 434                 fallthrough;
 435         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 436                 fallthrough;
 437         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 438         }
 439         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 440 #else
 441         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 442 #endif
 443 }
 444
 445 #ifdef CONFIG_CPU_BIG_ENDIAN
 446 #define unsafe_put_compat_sigset(compat, set, label) do {               \
 447         compat_sigset_t __user *__c = compat;                           \
 448         const sigset_t *__s = set;                                      \
 449                                                                         \
 450         switch (_NSIG_WORDS) {                                          \
 451         case 4:                                                         \
 452                 unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label);        \
 453                 unsafe_put_user(__s->sig[3], &__c->sig[6], label);      \
 454                 fallthrough;                                            \
 455         case 3:                                                         \
 456                 unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label);        \
 457                 unsafe_put_user(__s->sig[2], &__c->sig[4], label);      \
 458                 fallthrough;                                            \
 459         case 2:                                                         \
 460                 unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label);        \
 461                 unsafe_put_user(__s->sig[1], &__c->sig[2], label);      \
 462                 fallthrough;                                            \
 463         case 1:                                                         \
 464                 unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label);        \
 465                 unsafe_put_user(__s->sig[0], &__c->sig[0], label);      \
 466         }                                                               \
 467 } while (0)
 468 #else
 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         unsafe_copy_to_user(__c, __s, sizeof(*__c), label);             \
 474 } while (0)
 475 #endif
 476
 477 extern int compat_ptrace_request(struct task_struct *child,
 478                                  compat_long_t request,
 479                                  compat_ulong_t addr, compat_ulong_t data);
 480
 481 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 482                                compat_ulong_t addr, compat_ulong_t data);
 483
 484 struct epoll_event;     /* fortunately, this one is fixed-layout */
 485
 486 extern void __user *compat_alloc_user_space(unsigned long len);
 487
 488 int compat_restore_altstack(const compat_stack_t __user *uss);
 489 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 490 #define unsafe_compat_save_altstack(uss, sp, label) do { \
 491         compat_stack_t __user *__uss = uss; \
 492         struct task_struct *t = current; \
 493         unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
 494                         &__uss->ss_sp, label); \
 495         unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
 496         unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
 497         if (t->sas_ss_flags & SS_AUTODISARM) \
 498                 sas_ss_reset(t); \
 499 } while (0);
 500
 501 /*
 502  * These syscall function prototypes are kept in the same order as
 503  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 504  * go below.
 505  *
 506  * Please note that these prototypes here are only provided for information
 507  * purposes, for static analysis, and for linking from the syscall table.
 508  * These functions should not be called elsewhere from kernel code.
 509  *
 510  * As the syscall calling convention may be different from the default
 511  * for architectures overriding the syscall calling convention, do not
 512  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 513  */
 514 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 515 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 516 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 517                                      u32 __user *iocb);
 518 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 519                                         compat_long_t min_nr,
 520                                         compat_long_t nr,
 521                                         struct io_event __user *events,
 522                                         struct old_timespec32 __user *timeout,
 523                                         const struct __compat_aio_sigset __user *usig);
 524 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 525                                         compat_long_t min_nr,
 526                                         compat_long_t nr,
 527                                         struct io_event __user *events,
 528                                         struct __kernel_timespec __user *timeout,
 529                                         const struct __compat_aio_sigset __user *usig);
 530
 531 /* fs/cookies.c */
 532 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 533
 534 /* fs/eventpoll.c */
 535 asmlinkage long compat_sys_epoll_pwait(int epfd,
 536                         struct epoll_event __user *events,
 537                         int maxevents, int timeout,
 538                         const compat_sigset_t __user *sigmask,
 539                         compat_size_t sigsetsize);
 540 asmlinkage long compat_sys_epoll_pwait2(int epfd,
 541                         struct epoll_event __user *events,
 542                         int maxevents,
 543                         const struct __kernel_timespec __user *timeout,
 544                         const compat_sigset_t __user *sigmask,
 545                         compat_size_t sigsetsize);
 546
 547 /* fs/fcntl.c */
 548 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 549                                  compat_ulong_t arg);
 550 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 551                                    compat_ulong_t arg);
 552
 553 /* fs/ioctl.c */
 554 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 555                                  compat_ulong_t arg);
 556
 557 /* fs/open.c */
 558 asmlinkage long compat_sys_statfs(const char __user *pathname,
 559                                   struct compat_statfs __user *buf);
 560 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 561                                     compat_size_t sz,
 562                                     struct compat_statfs64 __user *buf);
 563 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 564                                    struct compat_statfs __user *buf);
 565 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 566                                      struct compat_statfs64 __user *buf);
 567 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 568 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 569 /* No generic prototype for truncate64, ftruncate64, fallocate */
 570 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 571                                   int flags, umode_t mode);
 572
 573 /* fs/readdir.c */
 574 asmlinkage long compat_sys_getdents(unsigned int fd,
 575                                     struct compat_linux_dirent __user *dirent,
 576                                     unsigned int count);
 577
 578 /* fs/read_write.c */
 579 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 580 /* No generic prototype for pread64 and pwrite64 */
 581 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 582                 const struct iovec __user *vec,
 583                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 584 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 585                 const struct iovec __user *vec,
 586                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 587 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 588 asmlinkage long compat_sys_preadv64(unsigned long fd,
 589                 const struct iovec __user *vec,
 590                 unsigned long vlen, loff_t pos);
 591 #endif
 592
 593 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 594 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 595                 const struct iovec __user *vec,
 596                 unsigned long vlen, loff_t pos);
 597 #endif
 598
 599 /* fs/sendfile.c */
 600 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 601                                     compat_off_t __user *offset, compat_size_t count);
 602 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 603                                     compat_loff_t __user *offset, compat_size_t count);
 604
 605 /* fs/select.c */
 606 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 607                                     compat_ulong_t __user *outp,
 608                                     compat_ulong_t __user *exp,
 609                                     struct old_timespec32 __user *tsp,
 610                                     void __user *sig);
 611 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 612                                     compat_ulong_t __user *outp,
 613                                     compat_ulong_t __user *exp,
 614                                     struct __kernel_timespec __user *tsp,
 615                                     void __user *sig);
 616 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 617                                  unsigned int nfds,
 618                                  struct old_timespec32 __user *tsp,
 619                                  const compat_sigset_t __user *sigmask,
 620                                  compat_size_t sigsetsize);
 621 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 622                                  unsigned int nfds,
 623                                  struct __kernel_timespec __user *tsp,
 624                                  const compat_sigset_t __user *sigmask,
 625                                  compat_size_t sigsetsize);
 626
 627 /* fs/signalfd.c */
 628 asmlinkage long compat_sys_signalfd4(int ufd,
 629                                      const compat_sigset_t __user *sigmask,
 630                                      compat_size_t sigsetsize, int flags);
 631
 632 /* fs/stat.c */
 633 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 634                                       const char __user *filename,
 635                                       struct compat_stat __user *statbuf,
 636                                       int flag);
 637 asmlinkage long compat_sys_newfstat(unsigned int fd,
 638                                     struct compat_stat __user *statbuf);
 639
 640 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 641
 642 /* kernel/exit.c */
 643 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 644                 struct compat_siginfo __user *, int,
 645                 struct compat_rusage __user *);
 646
 647
 648
 649 /* kernel/futex.c */
 650 asmlinkage long
 651 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 652                            compat_size_t len);
 653 asmlinkage long
 654 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 655                            compat_size_t __user *len_ptr);
 656
 657 /* kernel/itimer.c */
 658 asmlinkage long compat_sys_getitimer(int which,
 659                                      struct old_itimerval32 __user *it);
 660 asmlinkage long compat_sys_setitimer(int which,
 661                                      struct old_itimerval32 __user *in,
 662                                      struct old_itimerval32 __user *out);
 663
 664 /* kernel/kexec.c */
 665 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 666                                       compat_ulong_t nr_segments,
 667                                       struct compat_kexec_segment __user *,
 668                                       compat_ulong_t flags);
 669
 670 /* kernel/posix-timers.c */
 671 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 672                         struct compat_sigevent __user *timer_event_spec,
 673                         timer_t __user *created_timer_id);
 674
 675 /* kernel/ptrace.c */
 676 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 677                                   compat_long_t addr, compat_long_t data);
 678
 679 /* kernel/sched/core.c */
 680 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 681                                      unsigned int len,
 682                                      compat_ulong_t __user *user_mask_ptr);
 683 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 684                                      unsigned int len,
 685                                      compat_ulong_t __user *user_mask_ptr);
 686
 687 /* kernel/signal.c */
 688 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 689                                        compat_stack_t __user *uoss_ptr);
 690 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 691                                          compat_size_t sigsetsize);
 692 #ifndef CONFIG_ODD_RT_SIGACTION
 693 asmlinkage long compat_sys_rt_sigaction(int,
 694                                  const struct compat_sigaction __user *,
 695                                  struct compat_sigaction __user *,
 696                                  compat_size_t);
 697 #endif
 698 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 699                                           compat_sigset_t __user *oset,
 700                                           compat_size_t sigsetsize);
 701 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 702                                          compat_size_t sigsetsize);
 703 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 704                 struct compat_siginfo __user *uinfo,
 705                 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 706 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 707                 struct compat_siginfo __user *uinfo,
 708                 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 709 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 710                                 struct compat_siginfo __user *uinfo);
 711 /* No generic prototype for rt_sigreturn */
 712
 713 /* kernel/sys.c */
 714 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 715 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 716                                      struct compat_rlimit __user *rlim);
 717 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 718                                      struct compat_rlimit __user *rlim);
 719 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 720
 721 /* kernel/time.c */
 722 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 723                 struct timezone __user *tz);
 724 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 725                 struct timezone __user *tz);
 726
 727 /* kernel/timer.c */
 728 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 729
 730 /* ipc/mqueue.c */
 731 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 732                         int oflag, compat_mode_t mode,
 733                         struct compat_mq_attr __user *u_attr);
 734 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 735                         const struct compat_sigevent __user *u_notification);
 736 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 737                         const struct compat_mq_attr __user *u_mqstat,
 738                         struct compat_mq_attr __user *u_omqstat);
 739
 740 /* ipc/msg.c */
 741 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 742 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 743                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 744 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 745                 compat_ssize_t msgsz, int msgflg);
 746
 747 /* ipc/sem.c */
 748 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 749
 750 /* ipc/shm.c */
 751 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 752 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 753
 754 /* net/socket.c */
 755 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 756                             unsigned flags, struct sockaddr __user *addr,
 757                             int __user *addrlen);
 758 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 759                                    unsigned flags);
 760 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 761                                    unsigned int flags);
 762
 763 /* mm/filemap.c: No generic prototype for readahead */
 764
 765 /* security/keys/keyctl.c */
 766 asmlinkage long compat_sys_keyctl(u32 option,
 767                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 768
 769 /* arch/example/kernel/sys_example.c */
 770 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 771                      const compat_uptr_t __user *envp);
 772
 773 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 774
 775 /* mm/, CONFIG_MMU only */
 776 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 777                                  compat_ulong_t mode,
 778                                  compat_ulong_t __user *nmask,
 779                                  compat_ulong_t maxnode, compat_ulong_t flags);
 780 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 781                                          compat_ulong_t __user *nmask,
 782                                          compat_ulong_t maxnode,
 783                                          compat_ulong_t addr,
 784                                          compat_ulong_t flags);
 785 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 786                                          compat_ulong_t maxnode);
 787 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 788                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 789                 const compat_ulong_t __user *new_nodes);
 790 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 791                                       __u32 __user *pages,
 792                                       const int __user *nodes,
 793                                       int __user *status,
 794                                       int flags);
 795
 796 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 797                                         compat_pid_t pid, int sig,
 798                                         struct compat_siginfo __user *uinfo);
 799 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 800                                     unsigned vlen, unsigned int flags,
 801                                     struct __kernel_timespec __user *timeout);
 802 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 803                                     unsigned vlen, unsigned int flags,
 804                                     struct old_timespec32 __user *timeout);
 805 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 806                                  compat_uint_t __user *stat_addr, int options,
 807                                  struct compat_rusage __user *ru);
 808 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 809                                             int, const char __user *);
 810 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 811                                              struct file_handle __user *handle,
 812                                              int flags);
 813 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 814                                     unsigned vlen, unsigned int flags);
 815 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 816                      const compat_uptr_t __user *argv,
 817                      const compat_uptr_t __user *envp, int flags);
 818 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 819                 const struct iovec __user *vec,
 820                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 821 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 822                 const struct iovec __user *vec,
 823                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 824 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 825 asmlinkage long  compat_sys_preadv64v2(unsigned long fd,
 826                 const struct iovec __user *vec,
 827                 unsigned long vlen, loff_t pos, rwf_t flags);
 828 #endif
 829
 830 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 831 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 832                 const struct iovec __user *vec,
 833                 unsigned long vlen, loff_t pos, rwf_t flags);
 834 #endif
 835
 836
 837 /*
 838  * Deprecated system calls which are still defined in
 839  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 840  */
 841
 842 /* __ARCH_WANT_SYSCALL_NO_AT */
 843 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 844                                 umode_t mode);
 845
 846 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 847 asmlinkage long compat_sys_signalfd(int ufd,
 848                                     const compat_sigset_t __user *sigmask,
 849                                     compat_size_t sigsetsize);
 850
 851 /* __ARCH_WANT_SYSCALL_OFF_T */
 852 asmlinkage long compat_sys_newstat(const char __user *filename,
 853                                    struct compat_stat __user *statbuf);
 854 asmlinkage long compat_sys_newlstat(const char __user *filename,
 855                                     struct compat_stat __user *statbuf);
 856
 857 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 858 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 859                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 860                 struct old_timeval32 __user *tvp);
 861 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 862 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 863                                 unsigned flags);
 864
 865 /* obsolete: fs/readdir.c */
 866 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 867                                        struct compat_old_linux_dirent __user *,
 868                                        unsigned int count);
 869
 870 /* obsolete: fs/select.c */
 871 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 872
 873 /* obsolete: ipc */
 874 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 875
 876 /* obsolete: kernel/signal.c */
 877 #ifdef __ARCH_WANT_SYS_SIGPENDING
 878 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 879 #endif
 880
 881 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 882 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 883                                        compat_old_sigset_t __user *oset);
 884 #endif
 885 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 886 asmlinkage long compat_sys_sigaction(int sig,
 887                                    const struct compat_old_sigaction __user *act,
 888                                    struct compat_old_sigaction __user *oact);
 889 #endif
 890
 891 /* obsolete: net/socket.c */
 892 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 893
 894 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 895
 896
 897 /*
 898  * For most but not all architectures, "am I in a compat syscall?" and
 899  * "am I a compat task?" are the same question.  For architectures on which
 900  * they aren't the same question, arch code can override in_compat_syscall.
 901  */
 902
 903 #ifndef in_compat_syscall
 904 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 905 #endif
 906
 907 /**
 908  * ns_to_old_timeval32 - Compat version of ns_to_timeval
 909  * @nsec:       the nanoseconds value to be converted
 910  *
 911  * Returns the old_timeval32 representation of the nsec parameter.
 912  */
 913 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
 914 {
 915         struct __kernel_old_timeval tv;
 916         struct old_timeval32 ctv;
 917
 918         tv = ns_to_kernel_old_timeval(nsec);
 919         ctv.tv_sec = tv.tv_sec;
 920         ctv.tv_usec = tv.tv_usec;
 921
 922         return ctv;
 923 }
 924
 925 /*
 926  * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 927  * directly.  Instead, use one of the functions which work equivalently, such
 928  * as the kcompat_sys_xyzyyz() functions prototyped below.
 929  */
 930
 931 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 932                      struct compat_statfs64 __user * buf);
 933 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 934                           struct compat_statfs64 __user * buf);
 935
 936 #else /* !CONFIG_COMPAT */
 937
 938 #define is_compat_task() (0)
 939 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
 940 #define in_compat_syscall in_compat_syscall
 941 static inline bool in_compat_syscall(void) { return false; }
 942
 943 #endif /* CONFIG_COMPAT */
 944
 945 /*
 946  * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
 947  * types, and will need special compat treatment for that.  Most architectures
 948  * don't need that special handling even for compat syscalls.
 949  */
 950 #ifndef compat_need_64bit_alignment_fixup
 951 #define compat_need_64bit_alignment_fixup()             false
 952 #endif
 953
 954 /*
 955  * A pointer passed in from user mode. This should not
 956  * be used for syscall parameters, just declare them
 957  * as pointers because the syscall entry code will have
 958  * appropriately converted them already.
 959  */
 960 #ifndef compat_ptr
 961 static inline void __user *compat_ptr(compat_uptr_t uptr)
 962 {
 963         return (void __user *)(unsigned long)uptr;
 964 }
 965 #endif
 966
 967 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 968 {
 969         return (u32)(unsigned long)uptr;
 970 }
 971
 972 #endif /* _LINUX_COMPAT_H */