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
  94#ifdef CONFIG_COMPAT
  95
  96#ifndef compat_user_stack_pointer
  97#define compat_user_stack_pointer() current_user_stack_pointer()
  98#endif
  99#ifndef compat_sigaltstack      /* we'll need that for MIPS */
 100typedef struct compat_sigaltstack {
 101        compat_uptr_t                   ss_sp;
 102        int                             ss_flags;
 103        compat_size_t                   ss_size;
 104} compat_stack_t;
 105#endif
 106#ifndef COMPAT_MINSIGSTKSZ
 107#define COMPAT_MINSIGSTKSZ      MINSIGSTKSZ
 108#endif
 109
 110#define compat_jiffies_to_clock_t(x)    \
 111                (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
 112
 113typedef __compat_uid32_t        compat_uid_t;
 114typedef __compat_gid32_t        compat_gid_t;
 115
 116struct compat_sel_arg_struct;
 117struct rusage;
 118
 119struct compat_itimerval {
 120        struct old_timeval32    it_interval;
 121        struct old_timeval32    it_value;
 122};
 123
 124struct itimerval;
 125int get_compat_itimerval(struct itimerval *, const struct compat_itimerval __user *);
 126int put_compat_itimerval(struct compat_itimerval __user *, const struct itimerval *);
 127
 128struct compat_tms {
 129        compat_clock_t          tms_utime;
 130        compat_clock_t          tms_stime;
 131        compat_clock_t          tms_cutime;
 132        compat_clock_t          tms_cstime;
 133};
 134
 135#define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 136
 137typedef struct {
 138        compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 139} compat_sigset_t;
 140
 141int set_compat_user_sigmask(const compat_sigset_t __user *usigmask,
 142                            sigset_t *set, sigset_t *oldset,
 143                            size_t sigsetsize);
 144
 145struct compat_sigaction {
 146#ifndef __ARCH_HAS_IRIX_SIGACTION
 147        compat_uptr_t                   sa_handler;
 148        compat_ulong_t                  sa_flags;
 149#else
 150        compat_uint_t                   sa_flags;
 151        compat_uptr_t                   sa_handler;
 152#endif
 153#ifdef __ARCH_HAS_SA_RESTORER
 154        compat_uptr_t                   sa_restorer;
 155#endif
 156        compat_sigset_t                 sa_mask __packed;
 157};
 158
 159typedef union compat_sigval {
 160        compat_int_t    sival_int;
 161        compat_uptr_t   sival_ptr;
 162} compat_sigval_t;
 163
 164typedef struct compat_siginfo {
 165        int si_signo;
 166#ifndef __ARCH_HAS_SWAPPED_SIGINFO
 167        int si_errno;
 168        int si_code;
 169#else
 170        int si_code;
 171        int si_errno;
 172#endif
 173
 174        union {
 175                int _pad[128/sizeof(int) - 3];
 176
 177                /* kill() */
 178                struct {
 179                        compat_pid_t _pid;      /* sender's pid */
 180                        __compat_uid32_t _uid;  /* sender's uid */
 181                } _kill;
 182
 183                /* POSIX.1b timers */
 184                struct {
 185                        compat_timer_t _tid;    /* timer id */
 186                        int _overrun;           /* overrun count */
 187                        compat_sigval_t _sigval;        /* same as below */
 188                } _timer;
 189
 190                /* POSIX.1b signals */
 191                struct {
 192                        compat_pid_t _pid;      /* sender's pid */
 193                        __compat_uid32_t _uid;  /* sender's uid */
 194                        compat_sigval_t _sigval;
 195                } _rt;
 196
 197                /* SIGCHLD */
 198                struct {
 199                        compat_pid_t _pid;      /* which child */
 200                        __compat_uid32_t _uid;  /* sender's uid */
 201                        int _status;            /* exit code */
 202                        compat_clock_t _utime;
 203                        compat_clock_t _stime;
 204                } _sigchld;
 205
 206#ifdef CONFIG_X86_X32_ABI
 207                /* SIGCHLD (x32 version) */
 208                struct {
 209                        compat_pid_t _pid;      /* which child */
 210                        __compat_uid32_t _uid;  /* sender's uid */
 211                        int _status;            /* exit code */
 212                        compat_s64 _utime;
 213                        compat_s64 _stime;
 214                } _sigchld_x32;
 215#endif
 216
 217                /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 218                struct {
 219                        compat_uptr_t _addr;    /* faulting insn/memory ref. */
 220#ifdef __ARCH_SI_TRAPNO
 221                        int _trapno;    /* TRAP # which caused the signal */
 222#endif
 223#define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 224                                     sizeof(short) : __alignof__(compat_uptr_t))
 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                                        char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
 234                                        compat_uptr_t _lower;
 235                                        compat_uptr_t _upper;
 236                                } _addr_bnd;
 237                                /* used when si_code=SEGV_PKUERR */
 238                                struct {
 239                                        char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
 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 */
 263extern int compat_get_timespec(struct timespec *, const void __user *);
 264extern int compat_put_timespec(const struct timespec *, void __user *);
 265extern int compat_get_timeval(struct timeval *, const void __user *);
 266extern int compat_put_timeval(const struct timeval *, void __user *);
 267
 268struct compat_iovec {
 269        compat_uptr_t   iov_base;
 270        compat_size_t   iov_len;
 271};
 272
 273struct compat_rlimit {
 274        compat_ulong_t  rlim_cur;
 275        compat_ulong_t  rlim_max;
 276};
 277
 278struct compat_rusage {
 279        struct old_timeval32 ru_utime;
 280        struct old_timeval32 ru_stime;
 281        compat_long_t   ru_maxrss;
 282        compat_long_t   ru_ixrss;
 283        compat_long_t   ru_idrss;
 284        compat_long_t   ru_isrss;
 285        compat_long_t   ru_minflt;
 286        compat_long_t   ru_majflt;
 287        compat_long_t   ru_nswap;
 288        compat_long_t   ru_inblock;
 289        compat_long_t   ru_oublock;
 290        compat_long_t   ru_msgsnd;
 291        compat_long_t   ru_msgrcv;
 292        compat_long_t   ru_nsignals;
 293        compat_long_t   ru_nvcsw;
 294        compat_long_t   ru_nivcsw;
 295};
 296
 297extern int put_compat_rusage(const struct rusage *,
 298                             struct compat_rusage __user *);
 299
 300struct compat_siginfo;
 301struct __compat_aio_sigset;
 302
 303struct compat_dirent {
 304        u32             d_ino;
 305        compat_off_t    d_off;
 306        u16             d_reclen;
 307        char            d_name[256];
 308};
 309
 310struct compat_ustat {
 311        compat_daddr_t          f_tfree;
 312        compat_ino_t            f_tinode;
 313        char                    f_fname[6];
 314        char                    f_fpack[6];
 315};
 316
 317#define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 318
 319typedef struct compat_sigevent {
 320        compat_sigval_t sigev_value;
 321        compat_int_t sigev_signo;
 322        compat_int_t sigev_notify;
 323        union {
 324                compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 325                compat_int_t _tid;
 326
 327                struct {
 328                        compat_uptr_t _function;
 329                        compat_uptr_t _attribute;
 330                } _sigev_thread;
 331        } _sigev_un;
 332} compat_sigevent_t;
 333
 334struct compat_ifmap {
 335        compat_ulong_t mem_start;
 336        compat_ulong_t mem_end;
 337        unsigned short base_addr;
 338        unsigned char irq;
 339        unsigned char dma;
 340        unsigned char port;
 341};
 342
 343struct compat_if_settings {
 344        unsigned int type;      /* Type of physical device or protocol */
 345        unsigned int size;      /* Size of the data allocated by the caller */
 346        compat_uptr_t ifs_ifsu; /* union of pointers */
 347};
 348
 349struct compat_ifreq {
 350        union {
 351                char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 352        } ifr_ifrn;
 353        union {
 354                struct  sockaddr ifru_addr;
 355                struct  sockaddr ifru_dstaddr;
 356                struct  sockaddr ifru_broadaddr;
 357                struct  sockaddr ifru_netmask;
 358                struct  sockaddr ifru_hwaddr;
 359                short   ifru_flags;
 360                compat_int_t    ifru_ivalue;
 361                compat_int_t    ifru_mtu;
 362                struct  compat_ifmap ifru_map;
 363                char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 364                char    ifru_newname[IFNAMSIZ];
 365                compat_caddr_t  ifru_data;
 366                struct  compat_if_settings ifru_settings;
 367        } ifr_ifru;
 368};
 369
 370struct compat_ifconf {
 371        compat_int_t    ifc_len;                /* size of buffer */
 372        compat_caddr_t  ifcbuf;
 373};
 374
 375struct compat_robust_list {
 376        compat_uptr_t                   next;
 377};
 378
 379struct compat_robust_list_head {
 380        struct compat_robust_list       list;
 381        compat_long_t                   futex_offset;
 382        compat_uptr_t                   list_op_pending;
 383};
 384
 385#ifdef CONFIG_COMPAT_OLD_SIGACTION
 386struct compat_old_sigaction {
 387        compat_uptr_t                   sa_handler;
 388        compat_old_sigset_t             sa_mask;
 389        compat_ulong_t                  sa_flags;
 390        compat_uptr_t                   sa_restorer;
 391};
 392#endif
 393
 394struct compat_keyctl_kdf_params {
 395        compat_uptr_t hashname;
 396        compat_uptr_t otherinfo;
 397        __u32 otherinfolen;
 398        __u32 __spare[8];
 399};
 400
 401struct compat_statfs;
 402struct compat_statfs64;
 403struct compat_old_linux_dirent;
 404struct compat_linux_dirent;
 405struct linux_dirent64;
 406struct compat_msghdr;
 407struct compat_mmsghdr;
 408struct compat_sysinfo;
 409struct compat_sysctl_args;
 410struct compat_kexec_segment;
 411struct compat_mq_attr;
 412struct compat_msgbuf;
 413
 414extern void compat_exit_robust_list(struct task_struct *curr);
 415
 416#define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 417
 418#define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 419
 420long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 421                       unsigned long bitmap_size);
 422long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 423                       unsigned long bitmap_size);
 424int copy_siginfo_from_user32(kernel_siginfo_t *to, const struct compat_siginfo __user *from);
 425int copy_siginfo_to_user32(struct compat_siginfo __user *to, const kernel_siginfo_t *from);
 426int get_compat_sigevent(struct sigevent *event,
 427                const struct compat_sigevent __user *u_event);
 428
 429static inline int old_timeval32_compare(struct old_timeval32 *lhs,
 430                                        struct old_timeval32 *rhs)
 431{
 432        if (lhs->tv_sec < rhs->tv_sec)
 433                return -1;
 434        if (lhs->tv_sec > rhs->tv_sec)
 435                return 1;
 436        return lhs->tv_usec - rhs->tv_usec;
 437}
 438
 439static inline int old_timespec32_compare(struct old_timespec32 *lhs,
 440                                        struct old_timespec32 *rhs)
 441{
 442        if (lhs->tv_sec < rhs->tv_sec)
 443                return -1;
 444        if (lhs->tv_sec > rhs->tv_sec)
 445                return 1;
 446        return lhs->tv_nsec - rhs->tv_nsec;
 447}
 448
 449extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 450
 451/*
 452 * Defined inline such that size can be compile time constant, which avoids
 453 * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 454 */
 455static inline int
 456put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 457                  unsigned int size)
 458{
 459        /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 460#ifdef __BIG_ENDIAN
 461        compat_sigset_t v;
 462        switch (_NSIG_WORDS) {
 463        case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 464                /* fall through */
 465        case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 466                /* fall through */
 467        case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 468                /* fall through */
 469        case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 470        }
 471        return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 472#else
 473        return copy_to_user(compat, set, size) ? -EFAULT : 0;
 474#endif
 475}
 476
 477extern int compat_ptrace_request(struct task_struct *child,
 478                                 compat_long_t request,
 479                                 compat_ulong_t addr, compat_ulong_t data);
 480
 481extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 482                               compat_ulong_t addr, compat_ulong_t data);
 483
 484struct epoll_event;     /* fortunately, this one is fixed-layout */
 485
 486extern ssize_t compat_rw_copy_check_uvector(int type,
 487                const struct compat_iovec __user *uvector,
 488                unsigned long nr_segs,
 489                unsigned long fast_segs, struct iovec *fast_pointer,
 490                struct iovec **ret_pointer);
 491
 492extern void __user *compat_alloc_user_space(unsigned long len);
 493
 494int compat_restore_altstack(const compat_stack_t __user *uss);
 495int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 496#define compat_save_altstack_ex(uss, sp) do { \
 497        compat_stack_t __user *__uss = uss; \
 498        struct task_struct *t = current; \
 499        put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
 500        put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
 501        put_user_ex(t->sas_ss_size, &__uss->ss_size); \
 502        if (t->sas_ss_flags & SS_AUTODISARM) \
 503                sas_ss_reset(t); \
 504} while (0);
 505
 506/*
 507 * These syscall function prototypes are kept in the same order as
 508 * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 509 * go below.
 510 *
 511 * Please note that these prototypes here are only provided for information
 512 * purposes, for static analysis, and for linking from the syscall table.
 513 * These functions should not be called elsewhere from kernel code.
 514 *
 515 * As the syscall calling convention may be different from the default
 516 * for architectures overriding the syscall calling convention, do not
 517 * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 518 */
 519#ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 520asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 521asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 522                                     u32 __user *iocb);
 523asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 524                                        compat_long_t min_nr,
 525                                        compat_long_t nr,
 526                                        struct io_event __user *events,
 527                                        struct old_timespec32 __user *timeout,
 528                                        const struct __compat_aio_sigset __user *usig);
 529asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 530                                        compat_long_t min_nr,
 531                                        compat_long_t nr,
 532                                        struct io_event __user *events,
 533                                        struct __kernel_timespec __user *timeout,
 534                                        const struct __compat_aio_sigset __user *usig);
 535
 536/* fs/cookies.c */
 537asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 538
 539/* fs/eventpoll.c */
 540asmlinkage long compat_sys_epoll_pwait(int epfd,
 541                        struct epoll_event __user *events,
 542                        int maxevents, int timeout,
 543                        const compat_sigset_t __user *sigmask,
 544                        compat_size_t sigsetsize);
 545
 546/* fs/fcntl.c */
 547asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 548                                 compat_ulong_t arg);
 549asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 550                                   compat_ulong_t arg);
 551
 552/* fs/ioctl.c */
 553asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 554                                 compat_ulong_t arg);
 555
 556/* fs/namespace.c */
 557asmlinkage long compat_sys_mount(const char __user *dev_name,
 558                                 const char __user *dir_name,
 559                                 const char __user *type, compat_ulong_t flags,
 560                                 const void __user *data);
 561
 562/* fs/open.c */
 563asmlinkage long compat_sys_statfs(const char __user *pathname,
 564                                  struct compat_statfs __user *buf);
 565asmlinkage long compat_sys_statfs64(const char __user *pathname,
 566                                    compat_size_t sz,
 567                                    struct compat_statfs64 __user *buf);
 568asmlinkage long compat_sys_fstatfs(unsigned int fd,
 569                                   struct compat_statfs __user *buf);
 570asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 571                                     struct compat_statfs64 __user *buf);
 572asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 573asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 574/* No generic prototype for truncate64, ftruncate64, fallocate */
 575asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 576                                  int flags, umode_t mode);
 577
 578/* fs/readdir.c */
 579asmlinkage long compat_sys_getdents(unsigned int fd,
 580                                    struct compat_linux_dirent __user *dirent,
 581                                    unsigned int count);
 582
 583/* fs/read_write.c */
 584asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 585asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 586                const struct compat_iovec __user *vec, compat_ulong_t vlen);
 587asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 588                const struct compat_iovec __user *vec, compat_ulong_t vlen);
 589/* No generic prototype for pread64 and pwrite64 */
 590asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 591                const struct compat_iovec __user *vec,
 592                compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 593asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 594                const struct compat_iovec __user *vec,
 595                compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 596#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 597asmlinkage long compat_sys_preadv64(unsigned long fd,
 598                const struct compat_iovec __user *vec,
 599                unsigned long vlen, loff_t pos);
 600#endif
 601
 602#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 603asmlinkage long compat_sys_pwritev64(unsigned long fd,
 604                const struct compat_iovec __user *vec,
 605                unsigned long vlen, loff_t pos);
 606#endif
 607
 608/* fs/sendfile.c */
 609asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 610                                    compat_off_t __user *offset, compat_size_t count);
 611asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 612                                    compat_loff_t __user *offset, compat_size_t count);
 613
 614/* fs/select.c */
 615asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 616                                    compat_ulong_t __user *outp,
 617                                    compat_ulong_t __user *exp,
 618                                    struct old_timespec32 __user *tsp,
 619                                    void __user *sig);
 620asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 621                                    compat_ulong_t __user *outp,
 622                                    compat_ulong_t __user *exp,
 623                                    struct __kernel_timespec __user *tsp,
 624                                    void __user *sig);
 625asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 626                                 unsigned int nfds,
 627                                 struct old_timespec32 __user *tsp,
 628                                 const compat_sigset_t __user *sigmask,
 629                                 compat_size_t sigsetsize);
 630asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 631                                 unsigned int nfds,
 632                                 struct __kernel_timespec __user *tsp,
 633                                 const compat_sigset_t __user *sigmask,
 634                                 compat_size_t sigsetsize);
 635
 636/* fs/signalfd.c */
 637asmlinkage long compat_sys_signalfd4(int ufd,
 638                                     const compat_sigset_t __user *sigmask,
 639                                     compat_size_t sigsetsize, int flags);
 640
 641/* fs/splice.c */
 642asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 643                                    unsigned int nr_segs, unsigned int flags);
 644
 645/* fs/stat.c */
 646asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 647                                      const char __user *filename,
 648                                      struct compat_stat __user *statbuf,
 649                                      int flag);
 650asmlinkage long compat_sys_newfstat(unsigned int fd,
 651                                    struct compat_stat __user *statbuf);
 652
 653/* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 654
 655/* kernel/exit.c */
 656asmlinkage long compat_sys_waitid(int, compat_pid_t,
 657                struct compat_siginfo __user *, int,
 658                struct compat_rusage __user *);
 659
 660
 661
 662/* kernel/futex.c */
 663asmlinkage long
 664compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 665                           compat_size_t len);
 666asmlinkage long
 667compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 668                           compat_size_t __user *len_ptr);
 669
 670/* kernel/itimer.c */
 671asmlinkage long compat_sys_getitimer(int which,
 672                                     struct compat_itimerval __user *it);
 673asmlinkage long compat_sys_setitimer(int which,
 674                                     struct compat_itimerval __user *in,
 675                                     struct compat_itimerval __user *out);
 676
 677/* kernel/kexec.c */
 678asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 679                                      compat_ulong_t nr_segments,
 680                                      struct compat_kexec_segment __user *,
 681                                      compat_ulong_t flags);
 682
 683/* kernel/posix-timers.c */
 684asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 685                        struct compat_sigevent __user *timer_event_spec,
 686                        timer_t __user *created_timer_id);
 687
 688/* kernel/ptrace.c */
 689asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 690                                  compat_long_t addr, compat_long_t data);
 691
 692/* kernel/sched/core.c */
 693asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 694                                     unsigned int len,
 695                                     compat_ulong_t __user *user_mask_ptr);
 696asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 697                                     unsigned int len,
 698                                     compat_ulong_t __user *user_mask_ptr);
 699
 700/* kernel/signal.c */
 701asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 702                                       compat_stack_t __user *uoss_ptr);
 703asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 704                                         compat_size_t sigsetsize);
 705#ifndef CONFIG_ODD_RT_SIGACTION
 706asmlinkage long compat_sys_rt_sigaction(int,
 707                                 const struct compat_sigaction __user *,
 708                                 struct compat_sigaction __user *,
 709                                 compat_size_t);
 710#endif
 711asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 712                                          compat_sigset_t __user *oset,
 713                                          compat_size_t sigsetsize);
 714asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 715                                         compat_size_t sigsetsize);
 716asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 717                struct compat_siginfo __user *uinfo,
 718                struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 719asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 720                struct compat_siginfo __user *uinfo,
 721                struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 722asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 723                                struct compat_siginfo __user *uinfo);
 724/* No generic prototype for rt_sigreturn */
 725
 726/* kernel/sys.c */
 727asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 728asmlinkage long compat_sys_getrlimit(unsigned int resource,
 729                                     struct compat_rlimit __user *rlim);
 730asmlinkage long compat_sys_setrlimit(unsigned int resource,
 731                                     struct compat_rlimit __user *rlim);
 732asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 733
 734/* kernel/time.c */
 735asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 736                struct timezone __user *tz);
 737asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 738                struct timezone __user *tz);
 739
 740/* kernel/timer.c */
 741asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 742
 743/* ipc/mqueue.c */
 744asmlinkage long compat_sys_mq_open(const char __user *u_name,
 745                        int oflag, compat_mode_t mode,
 746                        struct compat_mq_attr __user *u_attr);
 747asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 748                        const struct compat_sigevent __user *u_notification);
 749asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 750                        const struct compat_mq_attr __user *u_mqstat,
 751                        struct compat_mq_attr __user *u_omqstat);
 752
 753/* ipc/msg.c */
 754asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 755asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 756                compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 757asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 758                compat_ssize_t msgsz, int msgflg);
 759
 760/* ipc/sem.c */
 761asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 762
 763/* ipc/shm.c */
 764asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 765asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 766
 767/* net/socket.c */
 768asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 769                            unsigned flags, struct sockaddr __user *addr,
 770                            int __user *addrlen);
 771asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 772                                      char __user *optval, unsigned int optlen);
 773asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 774                                      char __user *optval, int __user *optlen);
 775asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 776                                   unsigned flags);
 777asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 778                                   unsigned int flags);
 779
 780/* mm/filemap.c: No generic prototype for readahead */
 781
 782/* security/keys/keyctl.c */
 783asmlinkage long compat_sys_keyctl(u32 option,
 784                              u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 785
 786/* arch/example/kernel/sys_example.c */
 787asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 788                     const compat_uptr_t __user *envp);
 789
 790/* mm/fadvise.c: No generic prototype for fadvise64_64 */
 791
 792/* mm/, CONFIG_MMU only */
 793asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 794                                 compat_ulong_t mode,
 795                                 compat_ulong_t __user *nmask,
 796                                 compat_ulong_t maxnode, compat_ulong_t flags);
 797asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 798                                         compat_ulong_t __user *nmask,
 799                                         compat_ulong_t maxnode,
 800                                         compat_ulong_t addr,
 801                                         compat_ulong_t flags);
 802asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 803                                         compat_ulong_t maxnode);
 804asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 805                compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 806                const compat_ulong_t __user *new_nodes);
 807asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 808                                      __u32 __user *pages,
 809                                      const int __user *nodes,
 810                                      int __user *status,
 811                                      int flags);
 812
 813asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 814                                        compat_pid_t pid, int sig,
 815                                        struct compat_siginfo __user *uinfo);
 816asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 817                                    unsigned vlen, unsigned int flags,
 818                                    struct __kernel_timespec __user *timeout);
 819asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 820                                    unsigned vlen, unsigned int flags,
 821                                    struct old_timespec32 __user *timeout);
 822asmlinkage long compat_sys_wait4(compat_pid_t pid,
 823                                 compat_uint_t __user *stat_addr, int options,
 824                                 struct compat_rusage __user *ru);
 825asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 826                                            int, const char __user *);
 827asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 828                                             struct file_handle __user *handle,
 829                                             int flags);
 830asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 831                                    unsigned vlen, unsigned int flags);
 832asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 833                const struct compat_iovec __user *lvec,
 834                compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 835                compat_ulong_t riovcnt, compat_ulong_t flags);
 836asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 837                const struct compat_iovec __user *lvec,
 838                compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 839                compat_ulong_t riovcnt, compat_ulong_t flags);
 840asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 841                     const compat_uptr_t __user *argv,
 842                     const compat_uptr_t __user *envp, int flags);
 843asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 844                const struct compat_iovec __user *vec,
 845                compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 846asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 847                const struct compat_iovec __user *vec,
 848                compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 849#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 850asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 851                const struct compat_iovec __user *vec,
 852                unsigned long vlen, loff_t pos, rwf_t flags);
 853#endif
 854
 855#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 856asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 857                const struct compat_iovec __user *vec,
 858                unsigned long vlen, loff_t pos, rwf_t flags);
 859#endif
 860
 861
 862/*
 863 * Deprecated system calls which are still defined in
 864 * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 865 */
 866
 867/* __ARCH_WANT_SYSCALL_NO_AT */
 868asmlinkage long compat_sys_open(const char __user *filename, int flags,
 869                                umode_t mode);
 870
 871/* __ARCH_WANT_SYSCALL_NO_FLAGS */
 872asmlinkage long compat_sys_signalfd(int ufd,
 873                                    const compat_sigset_t __user *sigmask,
 874                                    compat_size_t sigsetsize);
 875
 876/* __ARCH_WANT_SYSCALL_OFF_T */
 877asmlinkage long compat_sys_newstat(const char __user *filename,
 878                                   struct compat_stat __user *statbuf);
 879asmlinkage long compat_sys_newlstat(const char __user *filename,
 880                                    struct compat_stat __user *statbuf);
 881
 882/* __ARCH_WANT_SYSCALL_DEPRECATED */
 883asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 884                compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 885                struct old_timeval32 __user *tvp);
 886asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 887asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 888                                unsigned flags);
 889asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
 890
 891/* obsolete: fs/readdir.c */
 892asmlinkage long compat_sys_old_readdir(unsigned int fd,
 893                                       struct compat_old_linux_dirent __user *,
 894                                       unsigned int count);
 895
 896/* obsolete: fs/select.c */
 897asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 898
 899/* obsolete: ipc */
 900asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 901
 902/* obsolete: kernel/signal.c */
 903#ifdef __ARCH_WANT_SYS_SIGPENDING
 904asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 905#endif
 906
 907#ifdef __ARCH_WANT_SYS_SIGPROCMASK
 908asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 909                                       compat_old_sigset_t __user *oset);
 910#endif
 911#ifdef CONFIG_COMPAT_OLD_SIGACTION
 912asmlinkage long compat_sys_sigaction(int sig,
 913                                   const struct compat_old_sigaction __user *act,
 914                                   struct compat_old_sigaction __user *oact);
 915#endif
 916
 917/* obsolete: net/socket.c */
 918asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 919
 920#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 921
 922
 923/*
 924 * For most but not all architectures, "am I in a compat syscall?" and
 925 * "am I a compat task?" are the same question.  For architectures on which
 926 * they aren't the same question, arch code can override in_compat_syscall.
 927 */
 928
 929#ifndef in_compat_syscall
 930static inline bool in_compat_syscall(void) { return is_compat_task(); }
 931#endif
 932
 933/**
 934 * ns_to_old_timeval32 - Compat version of ns_to_timeval
 935 * @nsec:       the nanoseconds value to be converted
 936 *
 937 * Returns the old_timeval32 representation of the nsec parameter.
 938 */
 939static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
 940{
 941        struct timeval tv;
 942        struct old_timeval32 ctv;
 943
 944        tv = ns_to_timeval(nsec);
 945        ctv.tv_sec = tv.tv_sec;
 946        ctv.tv_usec = tv.tv_usec;
 947
 948        return ctv;
 949}
 950
 951/*
 952 * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 953 * directly.  Instead, use one of the functions which work equivalently, such
 954 * as the kcompat_sys_xyzyyz() functions prototyped below.
 955 */
 956
 957int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 958                     struct compat_statfs64 __user * buf);
 959int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 960                          struct compat_statfs64 __user * buf);
 961
 962#else /* !CONFIG_COMPAT */
 963
 964#define is_compat_task() (0)
 965/* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
 966#define in_compat_syscall in_compat_syscall
 967static inline bool in_compat_syscall(void) { return false; }
 968
 969#endif /* CONFIG_COMPAT */
 970
 971#endif /* _LINUX_COMPAT_H */
 972