LXR linux/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
  94struct 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 */
 105typedef 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
 118typedef __compat_uid32_t        compat_uid_t;
 119typedef __compat_gid32_t        compat_gid_t;
 120
 121struct compat_sel_arg_struct;
 122struct rusage;
 123
 124struct old_itimerval32;
 125
 126struct 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
 135typedef struct {
 136        compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 137} compat_sigset_t;
 138
 139int set_compat_user_sigmask(const compat_sigset_t __user *umask,
 140                            size_t sigsetsize);
 141
 142struct 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
 156typedef union compat_sigval {
 157        compat_int_t    sival_int;
 158        compat_uptr_t   sival_ptr;
 159} compat_sigval_t;
 160
 161typedef 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
 256struct compat_rlimit {
 257        compat_ulong_t  rlim_cur;
 258        compat_ulong_t  rlim_max;
 259};
 260
 261struct 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
 280extern int put_compat_rusage(const struct rusage *,
 281                             struct compat_rusage __user *);
 282
 283struct compat_siginfo;
 284struct __compat_aio_sigset;
 285
 286struct compat_dirent {
 287        u32             d_ino;
 288        compat_off_t    d_off;
 289        u16             d_reclen;
 290        char            d_name[256];
 291};
 292
 293struct 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
 302typedef 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
 317struct 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
 326struct 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
 332struct 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
 353struct compat_ifconf {
 354        compat_int_t    ifc_len;                /* size of buffer */
 355        compat_caddr_t  ifcbuf;
 356};
 357
 358struct compat_robust_list {
 359        compat_uptr_t                   next;
 360};
 361
 362struct 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
 369struct 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
 377struct compat_keyctl_kdf_params {
 378        compat_uptr_t hashname;
 379        compat_uptr_t otherinfo;
 380        __u32 otherinfolen;
 381        __u32 __spare[8];
 382};
 383
 384struct compat_statfs;
 385struct compat_statfs64;
 386struct compat_old_linux_dirent;
 387struct compat_linux_dirent;
 388struct linux_dirent64;
 389struct compat_msghdr;
 390struct compat_mmsghdr;
 391struct compat_sysinfo;
 392struct compat_sysctl_args;
 393struct compat_kexec_segment;
 394struct compat_mq_attr;
 395struct 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
 401long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 402                       unsigned long bitmap_size);
 403long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 404                       unsigned long bitmap_size);
 405void copy_siginfo_to_external32(struct compat_siginfo *to,
 406                const struct kernel_siginfo *from);
 407int copy_siginfo_from_user32(kernel_siginfo_t *to,
 408                const struct compat_siginfo __user *from);
 409int __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
 414int get_compat_sigevent(struct sigevent *event,
 415                const struct compat_sigevent __user *u_event);
 416
 417extern 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 */
 423static inline int
 424put_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
 445extern int compat_ptrace_request(struct task_struct *child,
 446                                 compat_long_t request,
 447                                 compat_ulong_t addr, compat_ulong_t data);
 448
 449extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 450                               compat_ulong_t addr, compat_ulong_t data);
 451
 452struct epoll_event;     /* fortunately, this one is fixed-layout */
 453
 454extern void __user *compat_alloc_user_space(unsigned long len);
 455
 456int compat_restore_altstack(const compat_stack_t __user *uss);
 457int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 458#define unsafe_compat_save_altstack(uss, sp, label) do { \
 459        compat_stack_t __user *__uss = uss; \
 460        struct task_struct *t = current; \
 461        unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
 462                        &__uss->ss_sp, label); \
 463        unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
 464        unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
 465        if (t->sas_ss_flags & SS_AUTODISARM) \
 466                sas_ss_reset(t); \
 467} while (0);
 468
 469/*
 470 * These syscall function prototypes are kept in the same order as
 471 * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 472 * go below.
 473 *
 474 * Please note that these prototypes here are only provided for information
 475 * purposes, for static analysis, and for linking from the syscall table.
 476 * These functions should not be called elsewhere from kernel code.
 477 *
 478 * As the syscall calling convention may be different from the default
 479 * for architectures overriding the syscall calling convention, do not
 480 * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 481 */
 482#ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 483asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 484asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 485                                     u32 __user *iocb);
 486asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 487                                        compat_long_t min_nr,
 488                                        compat_long_t nr,
 489                                        struct io_event __user *events,
 490                                        struct old_timespec32 __user *timeout,
 491                                        const struct __compat_aio_sigset __user *usig);
 492asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 493                                        compat_long_t min_nr,
 494                                        compat_long_t nr,
 495                                        struct io_event __user *events,
 496                                        struct __kernel_timespec __user *timeout,
 497                                        const struct __compat_aio_sigset __user *usig);
 498
 499/* fs/cookies.c */
 500asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 501
 502/* fs/eventpoll.c */
 503asmlinkage long compat_sys_epoll_pwait(int epfd,
 504                        struct epoll_event __user *events,
 505                        int maxevents, int timeout,
 506                        const compat_sigset_t __user *sigmask,
 507                        compat_size_t sigsetsize);
 508
 509/* fs/fcntl.c */
 510asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 511                                 compat_ulong_t arg);
 512asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 513                                   compat_ulong_t arg);
 514
 515/* fs/ioctl.c */
 516asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 517                                 compat_ulong_t arg);
 518
 519/* fs/open.c */
 520asmlinkage long compat_sys_statfs(const char __user *pathname,
 521                                  struct compat_statfs __user *buf);
 522asmlinkage long compat_sys_statfs64(const char __user *pathname,
 523                                    compat_size_t sz,
 524                                    struct compat_statfs64 __user *buf);
 525asmlinkage long compat_sys_fstatfs(unsigned int fd,
 526                                   struct compat_statfs __user *buf);
 527asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 528                                     struct compat_statfs64 __user *buf);
 529asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 530asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 531/* No generic prototype for truncate64, ftruncate64, fallocate */
 532asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 533                                  int flags, umode_t mode);
 534
 535/* fs/readdir.c */
 536asmlinkage long compat_sys_getdents(unsigned int fd,
 537                                    struct compat_linux_dirent __user *dirent,
 538                                    unsigned int count);
 539
 540/* fs/read_write.c */
 541asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 542/* No generic prototype for pread64 and pwrite64 */
 543asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 544                const struct iovec __user *vec,
 545                compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 546asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 547                const struct iovec __user *vec,
 548                compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 549#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 550asmlinkage long compat_sys_preadv64(unsigned long fd,
 551                const struct iovec __user *vec,
 552                unsigned long vlen, loff_t pos);
 553#endif
 554
 555#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 556asmlinkage long compat_sys_pwritev64(unsigned long fd,
 557                const struct iovec __user *vec,
 558                unsigned long vlen, loff_t pos);
 559#endif
 560
 561/* fs/sendfile.c */
 562asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 563                                    compat_off_t __user *offset, compat_size_t count);
 564asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 565                                    compat_loff_t __user *offset, compat_size_t count);
 566
 567/* fs/select.c */
 568asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 569                                    compat_ulong_t __user *outp,
 570                                    compat_ulong_t __user *exp,
 571                                    struct old_timespec32 __user *tsp,
 572                                    void __user *sig);
 573asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 574                                    compat_ulong_t __user *outp,
 575                                    compat_ulong_t __user *exp,
 576                                    struct __kernel_timespec __user *tsp,
 577                                    void __user *sig);
 578asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 579                                 unsigned int nfds,
 580                                 struct old_timespec32 __user *tsp,
 581                                 const compat_sigset_t __user *sigmask,
 582                                 compat_size_t sigsetsize);
 583asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 584                                 unsigned int nfds,
 585                                 struct __kernel_timespec __user *tsp,
 586                                 const compat_sigset_t __user *sigmask,
 587                                 compat_size_t sigsetsize);
 588
 589/* fs/signalfd.c */
 590asmlinkage long compat_sys_signalfd4(int ufd,
 591                                     const compat_sigset_t __user *sigmask,
 592                                     compat_size_t sigsetsize, int flags);
 593
 594/* fs/stat.c */
 595asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 596                                      const char __user *filename,
 597                                      struct compat_stat __user *statbuf,
 598                                      int flag);
 599asmlinkage long compat_sys_newfstat(unsigned int fd,
 600                                    struct compat_stat __user *statbuf);
 601
 602/* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 603
 604/* kernel/exit.c */
 605asmlinkage long compat_sys_waitid(int, compat_pid_t,
 606                struct compat_siginfo __user *, int,
 607                struct compat_rusage __user *);
 608
 609
 610
 611/* kernel/futex.c */
 612asmlinkage long
 613compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 614                           compat_size_t len);
 615asmlinkage long
 616compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 617                           compat_size_t __user *len_ptr);
 618
 619/* kernel/itimer.c */
 620asmlinkage long compat_sys_getitimer(int which,
 621                                     struct old_itimerval32 __user *it);
 622asmlinkage long compat_sys_setitimer(int which,
 623                                     struct old_itimerval32 __user *in,
 624                                     struct old_itimerval32 __user *out);
 625
 626/* kernel/kexec.c */
 627asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 628                                      compat_ulong_t nr_segments,
 629                                      struct compat_kexec_segment __user *,
 630                                      compat_ulong_t flags);
 631
 632/* kernel/posix-timers.c */
 633asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 634                        struct compat_sigevent __user *timer_event_spec,
 635                        timer_t __user *created_timer_id);
 636
 637/* kernel/ptrace.c */
 638asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 639                                  compat_long_t addr, compat_long_t data);
 640
 641/* kernel/sched/core.c */
 642asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 643                                     unsigned int len,
 644                                     compat_ulong_t __user *user_mask_ptr);
 645asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 646                                     unsigned int len,
 647                                     compat_ulong_t __user *user_mask_ptr);
 648
 649/* kernel/signal.c */
 650asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 651                                       compat_stack_t __user *uoss_ptr);
 652asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 653                                         compat_size_t sigsetsize);
 654#ifndef CONFIG_ODD_RT_SIGACTION
 655asmlinkage long compat_sys_rt_sigaction(int,
 656                                 const struct compat_sigaction __user *,
 657                                 struct compat_sigaction __user *,
 658                                 compat_size_t);
 659#endif
 660asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 661                                          compat_sigset_t __user *oset,
 662                                          compat_size_t sigsetsize);
 663asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 664                                         compat_size_t sigsetsize);
 665asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 666                struct compat_siginfo __user *uinfo,
 667                struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 668asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 669                struct compat_siginfo __user *uinfo,
 670                struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 671asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 672                                struct compat_siginfo __user *uinfo);
 673/* No generic prototype for rt_sigreturn */
 674
 675/* kernel/sys.c */
 676asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 677asmlinkage long compat_sys_getrlimit(unsigned int resource,
 678                                     struct compat_rlimit __user *rlim);
 679asmlinkage long compat_sys_setrlimit(unsigned int resource,
 680                                     struct compat_rlimit __user *rlim);
 681asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 682
 683/* kernel/time.c */
 684asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 685                struct timezone __user *tz);
 686asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 687                struct timezone __user *tz);
 688
 689/* kernel/timer.c */
 690asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 691
 692/* ipc/mqueue.c */
 693asmlinkage long compat_sys_mq_open(const char __user *u_name,
 694                        int oflag, compat_mode_t mode,
 695                        struct compat_mq_attr __user *u_attr);
 696asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 697                        const struct compat_sigevent __user *u_notification);
 698asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 699                        const struct compat_mq_attr __user *u_mqstat,
 700                        struct compat_mq_attr __user *u_omqstat);
 701
 702/* ipc/msg.c */
 703asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 704asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 705                compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 706asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 707                compat_ssize_t msgsz, int msgflg);
 708
 709/* ipc/sem.c */
 710asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 711
 712/* ipc/shm.c */
 713asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 714asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 715
 716/* net/socket.c */
 717asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 718                            unsigned flags, struct sockaddr __user *addr,
 719                            int __user *addrlen);
 720asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 721                                   unsigned flags);
 722asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 723                                   unsigned int flags);
 724
 725/* mm/filemap.c: No generic prototype for readahead */
 726
 727/* security/keys/keyctl.c */
 728asmlinkage long compat_sys_keyctl(u32 option,
 729                              u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 730
 731/* arch/example/kernel/sys_example.c */
 732asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 733                     const compat_uptr_t __user *envp);
 734
 735/* mm/fadvise.c: No generic prototype for fadvise64_64 */
 736
 737/* mm/, CONFIG_MMU only */
 738asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 739                                 compat_ulong_t mode,
 740                                 compat_ulong_t __user *nmask,
 741                                 compat_ulong_t maxnode, compat_ulong_t flags);
 742asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 743                                         compat_ulong_t __user *nmask,
 744                                         compat_ulong_t maxnode,
 745                                         compat_ulong_t addr,
 746                                         compat_ulong_t flags);
 747asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 748                                         compat_ulong_t maxnode);
 749asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 750                compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 751                const compat_ulong_t __user *new_nodes);
 752asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 753                                      __u32 __user *pages,
 754                                      const int __user *nodes,
 755                                      int __user *status,
 756                                      int flags);
 757
 758asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 759                                        compat_pid_t pid, int sig,
 760                                        struct compat_siginfo __user *uinfo);
 761asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 762                                    unsigned vlen, unsigned int flags,
 763                                    struct __kernel_timespec __user *timeout);
 764asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 765                                    unsigned vlen, unsigned int flags,
 766                                    struct old_timespec32 __user *timeout);
 767asmlinkage long compat_sys_wait4(compat_pid_t pid,
 768                                 compat_uint_t __user *stat_addr, int options,
 769                                 struct compat_rusage __user *ru);
 770asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 771                                            int, const char __user *);
 772asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 773                                             struct file_handle __user *handle,
 774                                             int flags);
 775asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 776                                    unsigned vlen, unsigned int flags);
 777asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 778                     const compat_uptr_t __user *argv,
 779                     const compat_uptr_t __user *envp, int flags);
 780asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 781                const struct iovec __user *vec,
 782                compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 783asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 784                const struct iovec __user *vec,
 785                compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 786#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 787asmlinkage long  compat_sys_preadv64v2(unsigned long fd,
 788                const struct iovec __user *vec,
 789                unsigned long vlen, loff_t pos, rwf_t flags);
 790#endif
 791
 792#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 793asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 794                const struct iovec __user *vec,
 795                unsigned long vlen, loff_t pos, rwf_t flags);
 796#endif
 797
 798
 799/*
 800 * Deprecated system calls which are still defined in
 801 * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 802 */
 803
 804/* __ARCH_WANT_SYSCALL_NO_AT */
 805asmlinkage long compat_sys_open(const char __user *filename, int flags,
 806                                umode_t mode);
 807
 808/* __ARCH_WANT_SYSCALL_NO_FLAGS */
 809asmlinkage long compat_sys_signalfd(int ufd,
 810                                    const compat_sigset_t __user *sigmask,
 811                                    compat_size_t sigsetsize);
 812
 813/* __ARCH_WANT_SYSCALL_OFF_T */
 814asmlinkage long compat_sys_newstat(const char __user *filename,
 815                                   struct compat_stat __user *statbuf);
 816asmlinkage long compat_sys_newlstat(const char __user *filename,
 817                                    struct compat_stat __user *statbuf);
 818
 819/* __ARCH_WANT_SYSCALL_DEPRECATED */
 820asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 821                compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 822                struct old_timeval32 __user *tvp);
 823asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 824asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 825                                unsigned flags);
 826
 827/* obsolete: fs/readdir.c */
 828asmlinkage long compat_sys_old_readdir(unsigned int fd,
 829                                       struct compat_old_linux_dirent __user *,
 830                                       unsigned int count);
 831
 832/* obsolete: fs/select.c */
 833asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 834
 835/* obsolete: ipc */
 836asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 837
 838/* obsolete: kernel/signal.c */
 839#ifdef __ARCH_WANT_SYS_SIGPENDING
 840asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 841#endif
 842
 843#ifdef __ARCH_WANT_SYS_SIGPROCMASK
 844asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 845                                       compat_old_sigset_t __user *oset);
 846#endif
 847#ifdef CONFIG_COMPAT_OLD_SIGACTION
 848asmlinkage long compat_sys_sigaction(int sig,
 849                                   const struct compat_old_sigaction __user *act,
 850                                   struct compat_old_sigaction __user *oact);
 851#endif
 852
 853/* obsolete: net/socket.c */
 854asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 855
 856#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 857
 858
 859/*
 860 * For most but not all architectures, "am I in a compat syscall?" and
 861 * "am I a compat task?" are the same question.  For architectures on which
 862 * they aren't the same question, arch code can override in_compat_syscall.
 863 */
 864
 865#ifndef in_compat_syscall
 866static inline bool in_compat_syscall(void) { return is_compat_task(); }
 867#endif
 868
 869/**
 870 * ns_to_old_timeval32 - Compat version of ns_to_timeval
 871 * @nsec:       the nanoseconds value to be converted
 872 *
 873 * Returns the old_timeval32 representation of the nsec parameter.
 874 */
 875static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
 876{
 877        struct __kernel_old_timeval tv;
 878        struct old_timeval32 ctv;
 879
 880        tv = ns_to_kernel_old_timeval(nsec);
 881        ctv.tv_sec = tv.tv_sec;
 882        ctv.tv_usec = tv.tv_usec;
 883
 884        return ctv;
 885}
 886
 887/*
 888 * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 889 * directly.  Instead, use one of the functions which work equivalently, such
 890 * as the kcompat_sys_xyzyyz() functions prototyped below.
 891 */
 892
 893int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 894                     struct compat_statfs64 __user * buf);
 895int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 896                          struct compat_statfs64 __user * buf);
 897
 898#else /* !CONFIG_COMPAT */
 899
 900#define is_compat_task() (0)
 901/* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
 902#define in_compat_syscall in_compat_syscall
 903static inline bool in_compat_syscall(void) { return false; }
 904
 905#endif /* CONFIG_COMPAT */
 906
 907/*
 908 * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
 909 * types, and will need special compat treatment for that.  Most architectures
 910 * don't need that special handling even for compat syscalls.
 911 */
 912#ifndef compat_need_64bit_alignment_fixup
 913#define compat_need_64bit_alignment_fixup()             false
 914#endif
 915
 916/*
 917 * A pointer passed in from user mode. This should not
 918 * be used for syscall parameters, just declare them
 919 * as pointers because the syscall entry code will have
 920 * appropriately converted them already.
 921 */
 922#ifndef compat_ptr
 923static inline void __user *compat_ptr(compat_uptr_t uptr)
 924{
 925        return (void __user *)(unsigned long)uptr;
 926}
 927#endif
 928
 929static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 930{
 931        return (u32)(unsigned long)uptr;
 932}
 933
 934#endif /* _LINUX_COMPAT_H */
 935