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