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
  11 #ifdef CONFIG_COMPAT
  12
  13 #include <linux/stat.h>
  14 #include <linux/param.h>        /* for HZ */
  15 #include <linux/sem.h>
  16 #include <linux/socket.h>
  17 #include <linux/if.h>
  18 #include <linux/fs.h>
  19 #include <linux/aio_abi.h>      /* for aio_context_t */
  20 #include <linux/uaccess.h>
  21 #include <linux/unistd.h>
  22
  23 #include <asm/compat.h>
  24 #include <asm/siginfo.h>
  25 #include <asm/signal.h>
  26
  27 #ifndef COMPAT_USE_64BIT_TIME
  28 #define COMPAT_USE_64BIT_TIME 0
  29 #endif
  30
  31 #ifndef __SC_DELOUSE
  32 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
  33 #endif
  34
  35 #define COMPAT_SYSCALL_DEFINE0(name) \
  36         asmlinkage long compat_sys_##name(void); \
  37         ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
  38         asmlinkage long compat_sys_##name(void)
  39
  40 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
  41         COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
  42 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
  43         COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
  44 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
  45         COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
  46 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
  47         COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
  48 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
  49         COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
  50 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
  51         COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
  52
  53 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)                            \
  54         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  55         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))\
  56                 __attribute__((alias(__stringify(compat_SyS##name))));  \
  57         ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO); \
  58         static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  59         asmlinkage long compat_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__));\
  60         asmlinkage long compat_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__))\
  61         {                                                               \
  62                 return C_SYSC##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__)); \
  63         }                                                               \
  64         static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
  65
  66 #ifndef compat_user_stack_pointer
  67 #define compat_user_stack_pointer() current_user_stack_pointer()
  68 #endif
  69 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
  70 typedef struct compat_sigaltstack {
  71         compat_uptr_t                   ss_sp;
  72         int                             ss_flags;
  73         compat_size_t                   ss_size;
  74 } compat_stack_t;
  75 #endif
  76
  77 #define compat_jiffies_to_clock_t(x)    \
  78                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
  79
  80 typedef __compat_uid32_t        compat_uid_t;
  81 typedef __compat_gid32_t        compat_gid_t;
  82
  83 typedef compat_ulong_t          compat_aio_context_t;
  84
  85 struct compat_sel_arg_struct;
  86 struct rusage;
  87
  88 struct compat_itimerspec {
  89         struct compat_timespec it_interval;
  90         struct compat_timespec it_value;
  91 };
  92
  93 struct compat_utimbuf {
  94         compat_time_t           actime;
  95         compat_time_t           modtime;
  96 };
  97
  98 struct compat_itimerval {
  99         struct compat_timeval   it_interval;
 100         struct compat_timeval   it_value;
 101 };
 102
 103 struct itimerval;
 104 int get_compat_itimerval(struct itimerval *, const struct compat_itimerval __user *);
 105 int put_compat_itimerval(struct compat_itimerval __user *, const struct itimerval *);
 106
 107 struct compat_tms {
 108         compat_clock_t          tms_utime;
 109         compat_clock_t          tms_stime;
 110         compat_clock_t          tms_cutime;
 111         compat_clock_t          tms_cstime;
 112 };
 113
 114 struct compat_timex {
 115         compat_uint_t modes;
 116         compat_long_t offset;
 117         compat_long_t freq;
 118         compat_long_t maxerror;
 119         compat_long_t esterror;
 120         compat_int_t status;
 121         compat_long_t constant;
 122         compat_long_t precision;
 123         compat_long_t tolerance;
 124         struct compat_timeval time;
 125         compat_long_t tick;
 126         compat_long_t ppsfreq;
 127         compat_long_t jitter;
 128         compat_int_t shift;
 129         compat_long_t stabil;
 130         compat_long_t jitcnt;
 131         compat_long_t calcnt;
 132         compat_long_t errcnt;
 133         compat_long_t stbcnt;
 134         compat_int_t tai;
 135
 136         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
 137         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
 138         compat_int_t:32; compat_int_t:32; compat_int_t:32;
 139 };
 140
 141 struct timex;
 142 int compat_get_timex(struct timex *, const struct compat_timex __user *);
 143 int compat_put_timex(struct compat_timex __user *, const struct timex *);
 144
 145 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 146
 147 typedef struct {
 148         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 149 } compat_sigset_t;
 150
 151 struct compat_sigaction {
 152 #ifndef __ARCH_HAS_IRIX_SIGACTION
 153         compat_uptr_t                   sa_handler;
 154         compat_ulong_t                  sa_flags;
 155 #else
 156         compat_uint_t                   sa_flags;
 157         compat_uptr_t                   sa_handler;
 158 #endif
 159 #ifdef __ARCH_HAS_SA_RESTORER
 160         compat_uptr_t                   sa_restorer;
 161 #endif
 162         compat_sigset_t                 sa_mask __packed;
 163 };
 164
 165 typedef union compat_sigval {
 166         compat_int_t    sival_int;
 167         compat_uptr_t   sival_ptr;
 168 } compat_sigval_t;
 169
 170 typedef struct compat_siginfo {
 171         int si_signo;
 172 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
 173         int si_errno;
 174         int si_code;
 175 #else
 176         int si_code;
 177         int si_errno;
 178 #endif
 179
 180         union {
 181                 int _pad[128/sizeof(int) - 3];
 182
 183                 /* kill() */
 184                 struct {
 185                         compat_pid_t _pid;      /* sender's pid */
 186                         __compat_uid32_t _uid;  /* sender's uid */
 187                 } _kill;
 188
 189                 /* POSIX.1b timers */
 190                 struct {
 191                         compat_timer_t _tid;    /* timer id */
 192                         int _overrun;           /* overrun count */
 193                         compat_sigval_t _sigval;        /* same as below */
 194                 } _timer;
 195
 196                 /* POSIX.1b signals */
 197                 struct {
 198                         compat_pid_t _pid;      /* sender's pid */
 199                         __compat_uid32_t _uid;  /* sender's uid */
 200                         compat_sigval_t _sigval;
 201                 } _rt;
 202
 203                 /* SIGCHLD */
 204                 struct {
 205                         compat_pid_t _pid;      /* which child */
 206                         __compat_uid32_t _uid;  /* sender's uid */
 207                         int _status;            /* exit code */
 208                         compat_clock_t _utime;
 209                         compat_clock_t _stime;
 210                 } _sigchld;
 211
 212 #ifdef CONFIG_X86_X32_ABI
 213                 /* SIGCHLD (x32 version) */
 214                 struct {
 215                         compat_pid_t _pid;      /* which child */
 216                         __compat_uid32_t _uid;  /* sender's uid */
 217                         int _status;            /* exit code */
 218                         compat_s64 _utime;
 219                         compat_s64 _stime;
 220                 } _sigchld_x32;
 221 #endif
 222
 223                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 224                 struct {
 225                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
 226 #ifdef __ARCH_SI_TRAPNO
 227                         int _trapno;    /* TRAP # which caused the signal */
 228 #endif
 229 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 230                                      sizeof(short) : __alignof__(compat_uptr_t))
 231                         union {
 232                                 /*
 233                                  * used when si_code=BUS_MCEERR_AR or
 234                                  * used when si_code=BUS_MCEERR_AO
 235                                  */
 236                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
 237                                 /* used when si_code=SEGV_BNDERR */
 238                                 struct {
 239                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
 240                                         compat_uptr_t _lower;
 241                                         compat_uptr_t _upper;
 242                                 } _addr_bnd;
 243                                 /* used when si_code=SEGV_PKUERR */
 244                                 struct {
 245                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
 246                                         u32 _pkey;
 247                                 } _addr_pkey;
 248                         };
 249                 } _sigfault;
 250
 251                 /* SIGPOLL */
 252                 struct {
 253                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 254                         int _fd;
 255                 } _sigpoll;
 256
 257                 struct {
 258                         compat_uptr_t _call_addr; /* calling user insn */
 259                         int _syscall;   /* triggering system call number */
 260                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 261                 } _sigsys;
 262         } _sifields;
 263 } compat_siginfo_t;
 264
 265 /*
 266  * These functions operate on 32- or 64-bit specs depending on
 267  * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments.
 268  */
 269 extern int compat_get_timespec(struct timespec *, const void __user *);
 270 extern int compat_put_timespec(const struct timespec *, void __user *);
 271 extern int compat_get_timeval(struct timeval *, const void __user *);
 272 extern int compat_put_timeval(const struct timeval *, void __user *);
 273 extern int compat_get_timespec64(struct timespec64 *, const void __user *);
 274 extern int compat_put_timespec64(const struct timespec64 *, void __user *);
 275 extern int get_compat_itimerspec64(struct itimerspec64 *its,
 276                         const struct compat_itimerspec __user *uits);
 277 extern int put_compat_itimerspec64(const struct itimerspec64 *its,
 278                         struct compat_itimerspec __user *uits);
 279
 280 struct compat_iovec {
 281         compat_uptr_t   iov_base;
 282         compat_size_t   iov_len;
 283 };
 284
 285 struct compat_rlimit {
 286         compat_ulong_t  rlim_cur;
 287         compat_ulong_t  rlim_max;
 288 };
 289
 290 struct compat_rusage {
 291         struct compat_timeval ru_utime;
 292         struct compat_timeval ru_stime;
 293         compat_long_t   ru_maxrss;
 294         compat_long_t   ru_ixrss;
 295         compat_long_t   ru_idrss;
 296         compat_long_t   ru_isrss;
 297         compat_long_t   ru_minflt;
 298         compat_long_t   ru_majflt;
 299         compat_long_t   ru_nswap;
 300         compat_long_t   ru_inblock;
 301         compat_long_t   ru_oublock;
 302         compat_long_t   ru_msgsnd;
 303         compat_long_t   ru_msgrcv;
 304         compat_long_t   ru_nsignals;
 305         compat_long_t   ru_nvcsw;
 306         compat_long_t   ru_nivcsw;
 307 };
 308
 309 extern int put_compat_rusage(const struct rusage *,
 310                              struct compat_rusage __user *);
 311
 312 struct compat_siginfo;
 313
 314 struct compat_dirent {
 315         u32             d_ino;
 316         compat_off_t    d_off;
 317         u16             d_reclen;
 318         char            d_name[256];
 319 };
 320
 321 struct compat_ustat {
 322         compat_daddr_t          f_tfree;
 323         compat_ino_t            f_tinode;
 324         char                    f_fname[6];
 325         char                    f_fpack[6];
 326 };
 327
 328 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 329
 330 typedef struct compat_sigevent {
 331         compat_sigval_t sigev_value;
 332         compat_int_t sigev_signo;
 333         compat_int_t sigev_notify;
 334         union {
 335                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 336                 compat_int_t _tid;
 337
 338                 struct {
 339                         compat_uptr_t _function;
 340                         compat_uptr_t _attribute;
 341                 } _sigev_thread;
 342         } _sigev_un;
 343 } compat_sigevent_t;
 344
 345 struct compat_ifmap {
 346         compat_ulong_t mem_start;
 347         compat_ulong_t mem_end;
 348         unsigned short base_addr;
 349         unsigned char irq;
 350         unsigned char dma;
 351         unsigned char port;
 352 };
 353
 354 struct compat_if_settings {
 355         unsigned int type;      /* Type of physical device or protocol */
 356         unsigned int size;      /* Size of the data allocated by the caller */
 357         compat_uptr_t ifs_ifsu; /* union of pointers */
 358 };
 359
 360 struct compat_ifreq {
 361         union {
 362                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 363         } ifr_ifrn;
 364         union {
 365                 struct  sockaddr ifru_addr;
 366                 struct  sockaddr ifru_dstaddr;
 367                 struct  sockaddr ifru_broadaddr;
 368                 struct  sockaddr ifru_netmask;
 369                 struct  sockaddr ifru_hwaddr;
 370                 short   ifru_flags;
 371                 compat_int_t    ifru_ivalue;
 372                 compat_int_t    ifru_mtu;
 373                 struct  compat_ifmap ifru_map;
 374                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 375                 char    ifru_newname[IFNAMSIZ];
 376                 compat_caddr_t  ifru_data;
 377                 struct  compat_if_settings ifru_settings;
 378         } ifr_ifru;
 379 };
 380
 381 struct compat_ifconf {
 382         compat_int_t    ifc_len;                /* size of buffer */
 383         compat_caddr_t  ifcbuf;
 384 };
 385
 386 struct compat_robust_list {
 387         compat_uptr_t                   next;
 388 };
 389
 390 struct compat_robust_list_head {
 391         struct compat_robust_list       list;
 392         compat_long_t                   futex_offset;
 393         compat_uptr_t                   list_op_pending;
 394 };
 395
 396 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 397 struct compat_old_sigaction {
 398         compat_uptr_t                   sa_handler;
 399         compat_old_sigset_t             sa_mask;
 400         compat_ulong_t                  sa_flags;
 401         compat_uptr_t                   sa_restorer;
 402 };
 403 #endif
 404
 405 struct compat_keyctl_kdf_params {
 406         compat_uptr_t hashname;
 407         compat_uptr_t otherinfo;
 408         __u32 otherinfolen;
 409         __u32 __spare[8];
 410 };
 411
 412 struct compat_statfs;
 413 struct compat_statfs64;
 414 struct compat_old_linux_dirent;
 415 struct compat_linux_dirent;
 416 struct linux_dirent64;
 417 struct compat_msghdr;
 418 struct compat_mmsghdr;
 419 struct compat_sysinfo;
 420 struct compat_sysctl_args;
 421 struct compat_kexec_segment;
 422 struct compat_mq_attr;
 423 struct compat_msgbuf;
 424
 425 extern void compat_exit_robust_list(struct task_struct *curr);
 426
 427 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 428
 429 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 430
 431 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 432                        unsigned long bitmap_size);
 433 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 434                        unsigned long bitmap_size);
 435 int copy_siginfo_from_user32(siginfo_t *to, const struct compat_siginfo __user *from);
 436 int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from);
 437 int get_compat_sigevent(struct sigevent *event,
 438                 const struct compat_sigevent __user *u_event);
 439
 440 static inline int compat_timeval_compare(struct compat_timeval *lhs,
 441                                         struct compat_timeval *rhs)
 442 {
 443         if (lhs->tv_sec < rhs->tv_sec)
 444                 return -1;
 445         if (lhs->tv_sec > rhs->tv_sec)
 446                 return 1;
 447         return lhs->tv_usec - rhs->tv_usec;
 448 }
 449
 450 static inline int compat_timespec_compare(struct compat_timespec *lhs,
 451                                         struct compat_timespec *rhs)
 452 {
 453         if (lhs->tv_sec < rhs->tv_sec)
 454                 return -1;
 455         if (lhs->tv_sec > rhs->tv_sec)
 456                 return 1;
 457         return lhs->tv_nsec - rhs->tv_nsec;
 458 }
 459
 460 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 461
 462 /*
 463  * Defined inline such that size can be compile time constant, which avoids
 464  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 465  */
 466 static inline int
 467 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 468                   unsigned int size)
 469 {
 470         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 471 #ifdef __BIG_ENDIAN
 472         compat_sigset_t v;
 473         switch (_NSIG_WORDS) {
 474         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 475         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 476         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 477         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 478         }
 479         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 480 #else
 481         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 482 #endif
 483 }
 484
 485 extern int compat_ptrace_request(struct task_struct *child,
 486                                  compat_long_t request,
 487                                  compat_ulong_t addr, compat_ulong_t data);
 488
 489 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 490                                compat_ulong_t addr, compat_ulong_t data);
 491
 492 struct epoll_event;     /* fortunately, this one is fixed-layout */
 493
 494 extern ssize_t compat_rw_copy_check_uvector(int type,
 495                 const struct compat_iovec __user *uvector,
 496                 unsigned long nr_segs,
 497                 unsigned long fast_segs, struct iovec *fast_pointer,
 498                 struct iovec **ret_pointer);
 499
 500 extern void __user *compat_alloc_user_space(unsigned long len);
 501
 502 int compat_restore_altstack(const compat_stack_t __user *uss);
 503 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 504 #define compat_save_altstack_ex(uss, sp) do { \
 505         compat_stack_t __user *__uss = uss; \
 506         struct task_struct *t = current; \
 507         put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
 508         put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
 509         put_user_ex(t->sas_ss_size, &__uss->ss_size); \
 510         if (t->sas_ss_flags & SS_AUTODISARM) \
 511                 sas_ss_reset(t); \
 512 } while (0);
 513
 514 /*
 515  * These syscall function prototypes are kept in the same order as
 516  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 517  * go below.
 518  *
 519  * Please note that these prototypes here are only provided for information
 520  * purposes, for static analysis, and for linking from the syscall table.
 521  * These functions should not be called elsewhere from kernel code.
 522  */
 523 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 524 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 525                                      u32 __user *iocb);
 526 asmlinkage long compat_sys_io_getevents(compat_aio_context_t ctx_id,
 527                                         compat_long_t min_nr,
 528                                         compat_long_t nr,
 529                                         struct io_event __user *events,
 530                                         struct compat_timespec __user *timeout);
 531
 532 /* fs/cookies.c */
 533 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 534
 535 /* fs/eventpoll.c */
 536 asmlinkage long compat_sys_epoll_pwait(int epfd,
 537                         struct epoll_event __user *events,
 538                         int maxevents, int timeout,
 539                         const compat_sigset_t __user *sigmask,
 540                         compat_size_t sigsetsize);
 541
 542 /* fs/fcntl.c */
 543 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 544                                  compat_ulong_t arg);
 545 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 546                                    compat_ulong_t arg);
 547
 548 /* fs/ioctl.c */
 549 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 550                                  compat_ulong_t arg);
 551
 552 /* fs/namespace.c */
 553 asmlinkage long compat_sys_mount(const char __user *dev_name,
 554                                  const char __user *dir_name,
 555                                  const char __user *type, compat_ulong_t flags,
 556                                  const void __user *data);
 557
 558 /* fs/open.c */
 559 asmlinkage long compat_sys_statfs(const char __user *pathname,
 560                                   struct compat_statfs __user *buf);
 561 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 562                                     compat_size_t sz,
 563                                     struct compat_statfs64 __user *buf);
 564 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 565                                    struct compat_statfs __user *buf);
 566 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 567                                      struct compat_statfs64 __user *buf);
 568 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 569 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 570 /* No generic prototype for truncate64, ftruncate64, fallocate */
 571 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 572                                   int flags, umode_t mode);
 573
 574 /* fs/readdir.c */
 575 asmlinkage long compat_sys_getdents(unsigned int fd,
 576                                     struct compat_linux_dirent __user *dirent,
 577                                     unsigned int count);
 578
 579 /* fs/read_write.c */
 580 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 581 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 582                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 583 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 584                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 585 /* No generic prototype for pread64 and pwrite64 */
 586 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 587                 const struct compat_iovec __user *vec,
 588                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 589 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 590                 const struct compat_iovec __user *vec,
 591                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 592 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 593 asmlinkage long compat_sys_preadv64(unsigned long fd,
 594                 const struct compat_iovec __user *vec,
 595                 unsigned long vlen, loff_t pos);
 596 #endif
 597
 598 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 599 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 600                 const struct compat_iovec __user *vec,
 601                 unsigned long vlen, loff_t pos);
 602 #endif
 603
 604 /* fs/sendfile.c */
 605 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 606                                     compat_off_t __user *offset, compat_size_t count);
 607 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 608                                     compat_loff_t __user *offset, compat_size_t count);
 609
 610 /* fs/select.c */
 611 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
 612                                     compat_ulong_t __user *outp,
 613                                     compat_ulong_t __user *exp,
 614                                     struct compat_timespec __user *tsp,
 615                                     void __user *sig);
 616 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
 617                                  unsigned int nfds,
 618                                  struct compat_timespec __user *tsp,
 619                                  const compat_sigset_t __user *sigmask,
 620                                  compat_size_t sigsetsize);
 621
 622 /* fs/signalfd.c */
 623 asmlinkage long compat_sys_signalfd4(int ufd,
 624                                      const compat_sigset_t __user *sigmask,
 625                                      compat_size_t sigsetsize, int flags);
 626
 627 /* fs/splice.c */
 628 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 629                                     unsigned int nr_segs, unsigned int flags);
 630
 631 /* fs/stat.c */
 632 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 633                                       const char __user *filename,
 634                                       struct compat_stat __user *statbuf,
 635                                       int flag);
 636 asmlinkage long compat_sys_newfstat(unsigned int fd,
 637                                     struct compat_stat __user *statbuf);
 638
 639 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 640
 641 /* fs/timerfd.c */
 642 asmlinkage long compat_sys_timerfd_gettime(int ufd,
 643                                    struct compat_itimerspec __user *otmr);
 644 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
 645                                    const struct compat_itimerspec __user *utmr,
 646                                    struct compat_itimerspec __user *otmr);
 647
 648 /* fs/utimes.c */
 649 asmlinkage long compat_sys_utimensat(unsigned int dfd,
 650                                      const char __user *filename,
 651                                      struct compat_timespec __user *t,
 652                                      int flags);
 653
 654 /* kernel/exit.c */
 655 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 656                 struct compat_siginfo __user *, int,
 657                 struct compat_rusage __user *);
 658
 659
 660
 661 /* kernel/futex.c */
 662 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
 663                 struct compat_timespec __user *utime, u32 __user *uaddr2,
 664                 u32 val3);
 665 asmlinkage long
 666 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 667                            compat_size_t len);
 668 asmlinkage long
 669 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 670                            compat_size_t __user *len_ptr);
 671
 672 /* kernel/hrtimer.c */
 673 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 674                                      struct compat_timespec __user *rmtp);
 675
 676 /* kernel/itimer.c */
 677 asmlinkage long compat_sys_getitimer(int which,
 678                                      struct compat_itimerval __user *it);
 679 asmlinkage long compat_sys_setitimer(int which,
 680                                      struct compat_itimerval __user *in,
 681                                      struct compat_itimerval __user *out);
 682
 683 /* kernel/kexec.c */
 684 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 685                                       compat_ulong_t nr_segments,
 686                                       struct compat_kexec_segment __user *,
 687                                       compat_ulong_t flags);
 688
 689 /* kernel/posix-timers.c */
 690 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 691                         struct compat_sigevent __user *timer_event_spec,
 692                         timer_t __user *created_timer_id);
 693 asmlinkage long compat_sys_timer_gettime(timer_t timer_id,
 694                                  struct compat_itimerspec __user *setting);
 695 asmlinkage long compat_sys_timer_settime(timer_t timer_id, int flags,
 696                                          struct compat_itimerspec __user *new,
 697                                          struct compat_itimerspec __user *old);
 698 asmlinkage long compat_sys_clock_settime(clockid_t which_clock,
 699                                          struct compat_timespec __user *tp);
 700 asmlinkage long compat_sys_clock_gettime(clockid_t which_clock,
 701                                          struct compat_timespec __user *tp);
 702 asmlinkage long compat_sys_clock_getres(clockid_t which_clock,
 703                                         struct compat_timespec __user *tp);
 704 asmlinkage long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 705                                            struct compat_timespec __user *rqtp,
 706                                            struct compat_timespec __user *rmtp);
 707
 708 /* kernel/ptrace.c */
 709 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 710                                   compat_long_t addr, compat_long_t data);
 711
 712 /* kernel/sched/core.c */
 713 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 714                                      unsigned int len,
 715                                      compat_ulong_t __user *user_mask_ptr);
 716 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 717                                      unsigned int len,
 718                                      compat_ulong_t __user *user_mask_ptr);
 719 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
 720                                                  struct compat_timespec __user *interval);
 721
 722 /* kernel/signal.c */
 723 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 724                                        compat_stack_t __user *uoss_ptr);
 725 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 726                                          compat_size_t sigsetsize);
 727 #ifndef CONFIG_ODD_RT_SIGACTION
 728 asmlinkage long compat_sys_rt_sigaction(int,
 729                                  const struct compat_sigaction __user *,
 730                                  struct compat_sigaction __user *,
 731                                  compat_size_t);
 732 #endif
 733 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 734                                           compat_sigset_t __user *oset,
 735                                           compat_size_t sigsetsize);
 736 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 737                                          compat_size_t sigsetsize);
 738 asmlinkage long compat_sys_rt_sigtimedwait(compat_sigset_t __user *uthese,
 739                 struct compat_siginfo __user *uinfo,
 740                 struct compat_timespec __user *uts, compat_size_t sigsetsize);
 741 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 742                                 struct compat_siginfo __user *uinfo);
 743 /* No generic prototype for rt_sigreturn */
 744
 745 /* kernel/sys.c */
 746 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 747 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 748                                      struct compat_rlimit __user *rlim);
 749 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 750                                      struct compat_rlimit __user *rlim);
 751 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 752
 753 /* kernel/time.c */
 754 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 755                 struct timezone __user *tz);
 756 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 757                 struct timezone __user *tz);
 758 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
 759
 760 /* kernel/timer.c */
 761 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 762
 763 /* ipc/mqueue.c */
 764 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 765                         int oflag, compat_mode_t mode,
 766                         struct compat_mq_attr __user *u_attr);
 767 asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
 768                         const char __user *u_msg_ptr,
 769                         compat_size_t msg_len, unsigned int msg_prio,
 770                         const struct compat_timespec __user *u_abs_timeout);
 771 asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
 772                         char __user *u_msg_ptr,
 773                         compat_size_t msg_len, unsigned int __user *u_msg_prio,
 774                         const struct compat_timespec __user *u_abs_timeout);
 775 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 776                         const struct compat_sigevent __user *u_notification);
 777 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 778                         const struct compat_mq_attr __user *u_mqstat,
 779                         struct compat_mq_attr __user *u_omqstat);
 780
 781 /* ipc/msg.c */
 782 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 783 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 784                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 785 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 786                 compat_ssize_t msgsz, int msgflg);
 787
 788 /* ipc/sem.c */
 789 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 790 asmlinkage long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 791                 unsigned nsems, const struct compat_timespec __user *timeout);
 792
 793 /* ipc/shm.c */
 794 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 795 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 796
 797 /* net/socket.c */
 798 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 799                             unsigned flags, struct sockaddr __user *addr,
 800                             int __user *addrlen);
 801 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 802                                       char __user *optval, unsigned int optlen);
 803 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 804                                       char __user *optval, int __user *optlen);
 805 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 806                                    unsigned flags);
 807 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 808                                    unsigned int flags);
 809
 810 /* mm/filemap.c: No generic prototype for readahead */
 811
 812 /* security/keys/keyctl.c */
 813 asmlinkage long compat_sys_keyctl(u32 option,
 814                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 815
 816 /* arch/example/kernel/sys_example.c */
 817 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 818                      const compat_uptr_t __user *envp);
 819
 820 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 821
 822 /* mm/, CONFIG_MMU only */
 823 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 824                                  compat_ulong_t mode,
 825                                  compat_ulong_t __user *nmask,
 826                                  compat_ulong_t maxnode, compat_ulong_t flags);
 827 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 828                                          compat_ulong_t __user *nmask,
 829                                          compat_ulong_t maxnode,
 830                                          compat_ulong_t addr,
 831                                          compat_ulong_t flags);
 832 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 833                                          compat_ulong_t maxnode);
 834 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 835                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 836                 const compat_ulong_t __user *new_nodes);
 837 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 838                                       __u32 __user *pages,
 839                                       const int __user *nodes,
 840                                       int __user *status,
 841                                       int flags);
 842
 843 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 844                                         compat_pid_t pid, int sig,
 845                                         struct compat_siginfo __user *uinfo);
 846 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 847                                     unsigned vlen, unsigned int flags,
 848                                     struct compat_timespec __user *timeout);
 849 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 850                                  compat_uint_t __user *stat_addr, int options,
 851                                  struct compat_rusage __user *ru);
 852 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 853                                             int, const char __user *);
 854 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 855                                              struct file_handle __user *handle,
 856                                              int flags);
 857 asmlinkage long compat_sys_clock_adjtime(clockid_t which_clock,
 858                                          struct compat_timex __user *tp);
 859 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 860                                     unsigned vlen, unsigned int flags);
 861 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 862                 const struct compat_iovec __user *lvec,
 863                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 864                 compat_ulong_t riovcnt, compat_ulong_t flags);
 865 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 866                 const struct compat_iovec __user *lvec,
 867                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 868                 compat_ulong_t riovcnt, compat_ulong_t flags);
 869 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 870                      const compat_uptr_t __user *argv,
 871                      const compat_uptr_t __user *envp, int flags);
 872 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 873                 const struct compat_iovec __user *vec,
 874                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 875 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 876                 const struct compat_iovec __user *vec,
 877                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 878 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 879 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 880                 const struct compat_iovec __user *vec,
 881                 unsigned long vlen, loff_t pos, rwf_t flags);
 882 #endif
 883
 884 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 885 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 886                 const struct compat_iovec __user *vec,
 887                 unsigned long vlen, loff_t pos, rwf_t flags);
 888 #endif
 889
 890
 891 /*
 892  * Deprecated system calls which are still defined in
 893  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 894  */
 895
 896 /* __ARCH_WANT_SYSCALL_NO_AT */
 897 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 898                                 umode_t mode);
 899 asmlinkage long compat_sys_utimes(const char __user *filename,
 900                                   struct compat_timeval __user *t);
 901
 902 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 903 asmlinkage long compat_sys_signalfd(int ufd,
 904                                     const compat_sigset_t __user *sigmask,
 905                                     compat_size_t sigsetsize);
 906
 907 /* __ARCH_WANT_SYSCALL_OFF_T */
 908 asmlinkage long compat_sys_newstat(const char __user *filename,
 909                                    struct compat_stat __user *statbuf);
 910 asmlinkage long compat_sys_newlstat(const char __user *filename,
 911                                     struct compat_stat __user *statbuf);
 912
 913 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 914 asmlinkage long compat_sys_time(compat_time_t __user *tloc);
 915 asmlinkage long compat_sys_utime(const char __user *filename,
 916                                  struct compat_utimbuf __user *t);
 917 asmlinkage long compat_sys_futimesat(unsigned int dfd,
 918                                      const char __user *filename,
 919                                      struct compat_timeval __user *t);
 920 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 921                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 922                 struct compat_timeval __user *tvp);
 923 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 924 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 925                                 unsigned flags);
 926 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
 927
 928 /* obsolete: fs/readdir.c */
 929 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 930                                        struct compat_old_linux_dirent __user *,
 931                                        unsigned int count);
 932
 933 /* obsolete: fs/select.c */
 934 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 935
 936 /* obsolete: ipc */
 937 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 938
 939 /* obsolete: kernel/signal.c */
 940 #ifdef __ARCH_WANT_SYS_SIGPENDING
 941 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 942 #endif
 943
 944 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 945 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 946                                        compat_old_sigset_t __user *oset);
 947 #endif
 948 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 949 asmlinkage long compat_sys_sigaction(int sig,
 950                                    const struct compat_old_sigaction __user *act,
 951                                    struct compat_old_sigaction __user *oact);
 952 #endif
 953
 954 /* obsolete: kernel/time/time.c */
 955 asmlinkage long compat_sys_stime(compat_time_t __user *tptr);
 956
 957 /* obsolete: net/socket.c */
 958 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 959
 960
 961 /*
 962  * For most but not all architectures, "am I in a compat syscall?" and
 963  * "am I a compat task?" are the same question.  For architectures on which
 964  * they aren't the same question, arch code can override in_compat_syscall.
 965  */
 966
 967 #ifndef in_compat_syscall
 968 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 969 #endif
 970
 971 /**
 972  * ns_to_compat_timeval - Compat version of ns_to_timeval
 973  * @nsec:       the nanoseconds value to be converted
 974  *
 975  * Returns the compat_timeval representation of the nsec parameter.
 976  */
 977 static inline struct compat_timeval ns_to_compat_timeval(s64 nsec)
 978 {
 979         struct timeval tv;
 980         struct compat_timeval ctv;
 981
 982         tv = ns_to_timeval(nsec);
 983         ctv.tv_sec = tv.tv_sec;
 984         ctv.tv_usec = tv.tv_usec;
 985
 986         return ctv;
 987 }
 988
 989 #else /* !CONFIG_COMPAT */
 990
 991 #define is_compat_task() (0)
 992 static inline bool in_compat_syscall(void) { return false; }
 993
 994 #endif /* CONFIG_COMPAT */
 995
 996 #endif /* _LINUX_COMPAT_H */