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 #include <asm/siginfo.h>
  24 #include <asm/signal.h>
  25
  26 #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
  27 /*
  28  * It may be useful for an architecture to override the definitions of the
  29  * COMPAT_SYSCALL_DEFINE0 and COMPAT_SYSCALL_DEFINEx() macros, in particular
  30  * to use a different calling convention for syscalls. To allow for that,
  31  + the prototypes for the compat_sys_*() functions below will *not* be included
  32  * if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
  33  */
  34 #include <asm/syscall_wrapper.h>
  35 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
  36
  37 #ifndef COMPAT_USE_64BIT_TIME
  38 #define COMPAT_USE_64BIT_TIME 0
  39 #endif
  40
  41 #ifndef __SC_DELOUSE
  42 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
  43 #endif
  44
  45 #ifndef COMPAT_SYSCALL_DEFINE0
  46 #define COMPAT_SYSCALL_DEFINE0(name) \
  47         asmlinkage long compat_sys_##name(void); \
  48         ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
  49         asmlinkage long compat_sys_##name(void)
  50 #endif /* COMPAT_SYSCALL_DEFINE0 */
  51
  52 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
  53         COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
  54 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
  55         COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
  56 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
  57         COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
  58 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
  59         COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
  60 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
  61         COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
  62 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
  63         COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
  64
  65 /*
  66  * The asmlinkage stub is aliased to a function named __se_compat_sys_*() which
  67  * sign-extends 32-bit ints to longs whenever needed. The actual work is
  68  * done within __do_compat_sys_*().
  69  */
  70 #ifndef COMPAT_SYSCALL_DEFINEx
  71 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)                                    \
  72         __diag_push();                                                          \
  73         __diag_ignore(GCC, 8, "-Wattribute-alias",                              \
  74                       "Type aliasing is used to sanitize syscall arguments");\
  75         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))        \
  76                 __attribute__((alias(__stringify(__se_compat_sys##name))));     \
  77         ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO);                         \
  78         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  79         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));  \
  80         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))   \
  81         {                                                                       \
  82                 long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
  83                 __MAP(x,__SC_TEST,__VA_ARGS__);                                 \
  84                 return ret;                                                     \
  85         }                                                                       \
  86         __diag_pop();                                                           \
  87         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
  88 #endif /* COMPAT_SYSCALL_DEFINEx */
  89
  90 struct compat_iovec {
  91         compat_uptr_t   iov_base;
  92         compat_size_t   iov_len;
  93 };
  94
  95 #ifndef compat_user_stack_pointer
  96 #define compat_user_stack_pointer() current_user_stack_pointer()
  97 #endif
  98 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
  99 typedef struct compat_sigaltstack {
 100         compat_uptr_t                   ss_sp;
 101         int                             ss_flags;
 102         compat_size_t                   ss_size;
 103 } compat_stack_t;
 104 #endif
 105 #ifndef COMPAT_MINSIGSTKSZ
 106 #define COMPAT_MINSIGSTKSZ      MINSIGSTKSZ
 107 #endif
 108
 109 #define compat_jiffies_to_clock_t(x)    \
 110                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
 111
 112 typedef __compat_uid32_t        compat_uid_t;
 113 typedef __compat_gid32_t        compat_gid_t;
 114
 115 struct compat_sel_arg_struct;
 116 struct rusage;
 117
 118 struct old_itimerval32;
 119
 120 struct compat_tms {
 121         compat_clock_t          tms_utime;
 122         compat_clock_t          tms_stime;
 123         compat_clock_t          tms_cutime;
 124         compat_clock_t          tms_cstime;
 125 };
 126
 127 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 128
 129 #ifndef compat_sigset_t
 130 typedef struct {
 131         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 132 } compat_sigset_t;
 133 #endif
 134
 135 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
 136                             size_t sigsetsize);
 137
 138 struct compat_sigaction {
 139 #ifndef __ARCH_HAS_IRIX_SIGACTION
 140         compat_uptr_t                   sa_handler;
 141         compat_ulong_t                  sa_flags;
 142 #else
 143         compat_uint_t                   sa_flags;
 144         compat_uptr_t                   sa_handler;
 145 #endif
 146 #ifdef __ARCH_HAS_SA_RESTORER
 147         compat_uptr_t                   sa_restorer;
 148 #endif
 149         compat_sigset_t                 sa_mask __packed;
 150 };
 151
 152 typedef union compat_sigval {
 153         compat_int_t    sival_int;
 154         compat_uptr_t   sival_ptr;
 155 } compat_sigval_t;
 156
 157 typedef struct compat_siginfo {
 158         int si_signo;
 159 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
 160         int si_errno;
 161         int si_code;
 162 #else
 163         int si_code;
 164         int si_errno;
 165 #endif
 166
 167         union {
 168                 int _pad[128/sizeof(int) - 3];
 169
 170                 /* kill() */
 171                 struct {
 172                         compat_pid_t _pid;      /* sender's pid */
 173                         __compat_uid32_t _uid;  /* sender's uid */
 174                 } _kill;
 175
 176                 /* POSIX.1b timers */
 177                 struct {
 178                         compat_timer_t _tid;    /* timer id */
 179                         int _overrun;           /* overrun count */
 180                         compat_sigval_t _sigval;        /* same as below */
 181                 } _timer;
 182
 183                 /* POSIX.1b signals */
 184                 struct {
 185                         compat_pid_t _pid;      /* sender's pid */
 186                         __compat_uid32_t _uid;  /* sender's uid */
 187                         compat_sigval_t _sigval;
 188                 } _rt;
 189
 190                 /* SIGCHLD */
 191                 struct {
 192                         compat_pid_t _pid;      /* which child */
 193                         __compat_uid32_t _uid;  /* sender's uid */
 194                         int _status;            /* exit code */
 195                         compat_clock_t _utime;
 196                         compat_clock_t _stime;
 197                 } _sigchld;
 198
 199 #ifdef CONFIG_X86_X32_ABI
 200                 /* SIGCHLD (x32 version) */
 201                 struct {
 202                         compat_pid_t _pid;      /* which child */
 203                         __compat_uid32_t _uid;  /* sender's uid */
 204                         int _status;            /* exit code */
 205                         compat_s64 _utime;
 206                         compat_s64 _stime;
 207                 } _sigchld_x32;
 208 #endif
 209
 210                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 211                 struct {
 212                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
 213 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 214                                      sizeof(short) : __alignof__(compat_uptr_t))
 215                         union {
 216                                 /* used on alpha and sparc */
 217                                 int _trapno;    /* TRAP # which caused the signal */
 218                                 /*
 219                                  * used when si_code=BUS_MCEERR_AR or
 220                                  * used when si_code=BUS_MCEERR_AO
 221                                  */
 222                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
 223                                 /* used when si_code=SEGV_BNDERR */
 224                                 struct {
 225                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
 226                                         compat_uptr_t _lower;
 227                                         compat_uptr_t _upper;
 228                                 } _addr_bnd;
 229                                 /* used when si_code=SEGV_PKUERR */
 230                                 struct {
 231                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
 232                                         u32 _pkey;
 233                                 } _addr_pkey;
 234                                 /* used when si_code=TRAP_PERF */
 235                                 struct {
 236                                         compat_ulong_t _data;
 237                                         u32 _type;
 238                                         u32 _flags;
 239                                 } _perf;
 240                         };
 241                 } _sigfault;
 242
 243                 /* SIGPOLL */
 244                 struct {
 245                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 246                         int _fd;
 247                 } _sigpoll;
 248
 249                 struct {
 250                         compat_uptr_t _call_addr; /* calling user insn */
 251                         int _syscall;   /* triggering system call number */
 252                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 253                 } _sigsys;
 254         } _sifields;
 255 } compat_siginfo_t;
 256
 257 struct compat_rlimit {
 258         compat_ulong_t  rlim_cur;
 259         compat_ulong_t  rlim_max;
 260 };
 261
 262 #ifdef __ARCH_NEED_COMPAT_FLOCK64_PACKED
 263 #define __ARCH_COMPAT_FLOCK64_PACK      __attribute__((packed))
 264 #else
 265 #define __ARCH_COMPAT_FLOCK64_PACK
 266 #endif
 267
 268 struct compat_flock {
 269         short                   l_type;
 270         short                   l_whence;
 271         compat_off_t            l_start;
 272         compat_off_t            l_len;
 273 #ifdef __ARCH_COMPAT_FLOCK_EXTRA_SYSID
 274         __ARCH_COMPAT_FLOCK_EXTRA_SYSID
 275 #endif
 276         compat_pid_t            l_pid;
 277 #ifdef __ARCH_COMPAT_FLOCK_PAD
 278         __ARCH_COMPAT_FLOCK_PAD
 279 #endif
 280 };
 281
 282 struct compat_flock64 {
 283         short           l_type;
 284         short           l_whence;
 285         compat_loff_t   l_start;
 286         compat_loff_t   l_len;
 287         compat_pid_t    l_pid;
 288 #ifdef __ARCH_COMPAT_FLOCK64_PAD
 289         __ARCH_COMPAT_FLOCK64_PAD
 290 #endif
 291 } __ARCH_COMPAT_FLOCK64_PACK;
 292
 293 struct compat_rusage {
 294         struct old_timeval32 ru_utime;
 295         struct old_timeval32 ru_stime;
 296         compat_long_t   ru_maxrss;
 297         compat_long_t   ru_ixrss;
 298         compat_long_t   ru_idrss;
 299         compat_long_t   ru_isrss;
 300         compat_long_t   ru_minflt;
 301         compat_long_t   ru_majflt;
 302         compat_long_t   ru_nswap;
 303         compat_long_t   ru_inblock;
 304         compat_long_t   ru_oublock;
 305         compat_long_t   ru_msgsnd;
 306         compat_long_t   ru_msgrcv;
 307         compat_long_t   ru_nsignals;
 308         compat_long_t   ru_nvcsw;
 309         compat_long_t   ru_nivcsw;
 310 };
 311
 312 extern int put_compat_rusage(const struct rusage *,
 313                              struct compat_rusage __user *);
 314
 315 struct compat_siginfo;
 316 struct __compat_aio_sigset;
 317
 318 struct compat_dirent {
 319         u32             d_ino;
 320         compat_off_t    d_off;
 321         u16             d_reclen;
 322         char            d_name[256];
 323 };
 324
 325 struct compat_ustat {
 326         compat_daddr_t          f_tfree;
 327         compat_ino_t            f_tinode;
 328         char                    f_fname[6];
 329         char                    f_fpack[6];
 330 };
 331
 332 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 333
 334 typedef struct compat_sigevent {
 335         compat_sigval_t sigev_value;
 336         compat_int_t sigev_signo;
 337         compat_int_t sigev_notify;
 338         union {
 339                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 340                 compat_int_t _tid;
 341
 342                 struct {
 343                         compat_uptr_t _function;
 344                         compat_uptr_t _attribute;
 345                 } _sigev_thread;
 346         } _sigev_un;
 347 } compat_sigevent_t;
 348
 349 struct compat_ifmap {
 350         compat_ulong_t mem_start;
 351         compat_ulong_t mem_end;
 352         unsigned short base_addr;
 353         unsigned char irq;
 354         unsigned char dma;
 355         unsigned char port;
 356 };
 357
 358 struct compat_if_settings {
 359         unsigned int type;      /* Type of physical device or protocol */
 360         unsigned int size;      /* Size of the data allocated by the caller */
 361         compat_uptr_t ifs_ifsu; /* union of pointers */
 362 };
 363
 364 struct compat_ifreq {
 365         union {
 366                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 367         } ifr_ifrn;
 368         union {
 369                 struct  sockaddr ifru_addr;
 370                 struct  sockaddr ifru_dstaddr;
 371                 struct  sockaddr ifru_broadaddr;
 372                 struct  sockaddr ifru_netmask;
 373                 struct  sockaddr ifru_hwaddr;
 374                 short   ifru_flags;
 375                 compat_int_t    ifru_ivalue;
 376                 compat_int_t    ifru_mtu;
 377                 struct  compat_ifmap ifru_map;
 378                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 379                 char    ifru_newname[IFNAMSIZ];
 380                 compat_caddr_t  ifru_data;
 381                 struct  compat_if_settings ifru_settings;
 382         } ifr_ifru;
 383 };
 384
 385 struct compat_ifconf {
 386         compat_int_t    ifc_len;                /* size of buffer */
 387         compat_caddr_t  ifcbuf;
 388 };
 389
 390 struct compat_robust_list {
 391         compat_uptr_t                   next;
 392 };
 393
 394 struct compat_robust_list_head {
 395         struct compat_robust_list       list;
 396         compat_long_t                   futex_offset;
 397         compat_uptr_t                   list_op_pending;
 398 };
 399
 400 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 401 struct compat_old_sigaction {
 402         compat_uptr_t                   sa_handler;
 403         compat_old_sigset_t             sa_mask;
 404         compat_ulong_t                  sa_flags;
 405         compat_uptr_t                   sa_restorer;
 406 };
 407 #endif
 408
 409 struct compat_keyctl_kdf_params {
 410         compat_uptr_t hashname;
 411         compat_uptr_t otherinfo;
 412         __u32 otherinfolen;
 413         __u32 __spare[8];
 414 };
 415
 416 struct compat_stat;
 417 struct compat_statfs;
 418 struct compat_statfs64;
 419 struct compat_old_linux_dirent;
 420 struct compat_linux_dirent;
 421 struct linux_dirent64;
 422 struct compat_msghdr;
 423 struct compat_mmsghdr;
 424 struct compat_sysinfo;
 425 struct compat_sysctl_args;
 426 struct compat_kexec_segment;
 427 struct compat_mq_attr;
 428 struct compat_msgbuf;
 429
 430 void copy_siginfo_to_external32(struct compat_siginfo *to,
 431                 const struct kernel_siginfo *from);
 432 int copy_siginfo_from_user32(kernel_siginfo_t *to,
 433                 const struct compat_siginfo __user *from);
 434 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
 435                 const kernel_siginfo_t *from);
 436 #ifndef copy_siginfo_to_user32
 437 #define copy_siginfo_to_user32 __copy_siginfo_to_user32
 438 #endif
 439 int get_compat_sigevent(struct sigevent *event,
 440                 const struct compat_sigevent __user *u_event);
 441
 442 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 443
 444 /*
 445  * Defined inline such that size can be compile time constant, which avoids
 446  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 447  */
 448 static inline int
 449 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 450                   unsigned int size)
 451 {
 452         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 453 #if defined(__BIG_ENDIAN) && defined(CONFIG_64BIT)
 454         compat_sigset_t v;
 455         switch (_NSIG_WORDS) {
 456         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 457                 fallthrough;
 458         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 459                 fallthrough;
 460         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 461                 fallthrough;
 462         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 463         }
 464         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 465 #else
 466         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 467 #endif
 468 }
 469
 470 #ifdef CONFIG_CPU_BIG_ENDIAN
 471 #define unsafe_put_compat_sigset(compat, set, label) do {               \
 472         compat_sigset_t __user *__c = compat;                           \
 473         const sigset_t *__s = set;                                      \
 474                                                                         \
 475         switch (_NSIG_WORDS) {                                          \
 476         case 4:                                                         \
 477                 unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label);        \
 478                 unsafe_put_user(__s->sig[3], &__c->sig[6], label);      \
 479                 fallthrough;                                            \
 480         case 3:                                                         \
 481                 unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label);        \
 482                 unsafe_put_user(__s->sig[2], &__c->sig[4], label);      \
 483                 fallthrough;                                            \
 484         case 2:                                                         \
 485                 unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label);        \
 486                 unsafe_put_user(__s->sig[1], &__c->sig[2], label);      \
 487                 fallthrough;                                            \
 488         case 1:                                                         \
 489                 unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label);        \
 490                 unsafe_put_user(__s->sig[0], &__c->sig[0], label);      \
 491         }                                                               \
 492 } while (0)
 493
 494 #define unsafe_get_compat_sigset(set, compat, label) do {               \
 495         const compat_sigset_t __user *__c = compat;                     \
 496         compat_sigset_word hi, lo;                                      \
 497         sigset_t *__s = set;                                            \
 498                                                                         \
 499         switch (_NSIG_WORDS) {                                          \
 500         case 4:                                                         \
 501                 unsafe_get_user(lo, &__c->sig[7], label);               \
 502                 unsafe_get_user(hi, &__c->sig[6], label);               \
 503                 __s->sig[3] = hi | (((long)lo) << 32);                  \
 504                 fallthrough;                                            \
 505         case 3:                                                         \
 506                 unsafe_get_user(lo, &__c->sig[5], label);               \
 507                 unsafe_get_user(hi, &__c->sig[4], label);               \
 508                 __s->sig[2] = hi | (((long)lo) << 32);                  \
 509                 fallthrough;                                            \
 510         case 2:                                                         \
 511                 unsafe_get_user(lo, &__c->sig[3], label);               \
 512                 unsafe_get_user(hi, &__c->sig[2], label);               \
 513                 __s->sig[1] = hi | (((long)lo) << 32);                  \
 514                 fallthrough;                                            \
 515         case 1:                                                         \
 516                 unsafe_get_user(lo, &__c->sig[1], label);               \
 517                 unsafe_get_user(hi, &__c->sig[0], label);               \
 518                 __s->sig[0] = hi | (((long)lo) << 32);                  \
 519         }                                                               \
 520 } while (0)
 521 #else
 522 #define unsafe_put_compat_sigset(compat, set, label) do {               \
 523         compat_sigset_t __user *__c = compat;                           \
 524         const sigset_t *__s = set;                                      \
 525                                                                         \
 526         unsafe_copy_to_user(__c, __s, sizeof(*__c), label);             \
 527 } while (0)
 528
 529 #define unsafe_get_compat_sigset(set, compat, label) do {               \
 530         const compat_sigset_t __user *__c = compat;                     \
 531         sigset_t *__s = set;                                            \
 532                                                                         \
 533         unsafe_copy_from_user(__s, __c, sizeof(*__c), label);           \
 534 } while (0)
 535 #endif
 536
 537 extern int compat_ptrace_request(struct task_struct *child,
 538                                  compat_long_t request,
 539                                  compat_ulong_t addr, compat_ulong_t data);
 540
 541 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 542                                compat_ulong_t addr, compat_ulong_t data);
 543
 544 struct epoll_event;     /* fortunately, this one is fixed-layout */
 545
 546 int compat_restore_altstack(const compat_stack_t __user *uss);
 547 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 548 #define unsafe_compat_save_altstack(uss, sp, label) do { \
 549         compat_stack_t __user *__uss = uss; \
 550         struct task_struct *t = current; \
 551         unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
 552                         &__uss->ss_sp, label); \
 553         unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
 554         unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
 555 } while (0);
 556
 557 /*
 558  * These syscall function prototypes are kept in the same order as
 559  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 560  * go below.
 561  *
 562  * Please note that these prototypes here are only provided for information
 563  * purposes, for static analysis, and for linking from the syscall table.
 564  * These functions should not be called elsewhere from kernel code.
 565  *
 566  * As the syscall calling convention may be different from the default
 567  * for architectures overriding the syscall calling convention, do not
 568  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 569  */
 570 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 571 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 572 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 573                                      u32 __user *iocb);
 574 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 575                                         compat_long_t min_nr,
 576                                         compat_long_t nr,
 577                                         struct io_event __user *events,
 578                                         struct old_timespec32 __user *timeout,
 579                                         const struct __compat_aio_sigset __user *usig);
 580 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 581                                         compat_long_t min_nr,
 582                                         compat_long_t nr,
 583                                         struct io_event __user *events,
 584                                         struct __kernel_timespec __user *timeout,
 585                                         const struct __compat_aio_sigset __user *usig);
 586
 587 /* fs/cookies.c */
 588 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 589
 590 /* fs/eventpoll.c */
 591 asmlinkage long compat_sys_epoll_pwait(int epfd,
 592                         struct epoll_event __user *events,
 593                         int maxevents, int timeout,
 594                         const compat_sigset_t __user *sigmask,
 595                         compat_size_t sigsetsize);
 596 asmlinkage long compat_sys_epoll_pwait2(int epfd,
 597                         struct epoll_event __user *events,
 598                         int maxevents,
 599                         const struct __kernel_timespec __user *timeout,
 600                         const compat_sigset_t __user *sigmask,
 601                         compat_size_t sigsetsize);
 602
 603 /* fs/fcntl.c */
 604 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 605                                  compat_ulong_t arg);
 606 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 607                                    compat_ulong_t arg);
 608
 609 /* fs/ioctl.c */
 610 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 611                                  compat_ulong_t arg);
 612
 613 /* fs/open.c */
 614 asmlinkage long compat_sys_statfs(const char __user *pathname,
 615                                   struct compat_statfs __user *buf);
 616 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 617                                     compat_size_t sz,
 618                                     struct compat_statfs64 __user *buf);
 619 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 620                                    struct compat_statfs __user *buf);
 621 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 622                                      struct compat_statfs64 __user *buf);
 623 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 624 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 625 /* No generic prototype for truncate64, ftruncate64, fallocate */
 626 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 627                                   int flags, umode_t mode);
 628
 629 /* fs/readdir.c */
 630 asmlinkage long compat_sys_getdents(unsigned int fd,
 631                                     struct compat_linux_dirent __user *dirent,
 632                                     unsigned int count);
 633
 634 /* fs/read_write.c */
 635 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 636 /* No generic prototype for pread64 and pwrite64 */
 637 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 638                 const struct iovec __user *vec,
 639                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 640 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 641                 const struct iovec __user *vec,
 642                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 643 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 644 asmlinkage long compat_sys_preadv64(unsigned long fd,
 645                 const struct iovec __user *vec,
 646                 unsigned long vlen, loff_t pos);
 647 #endif
 648
 649 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 650 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 651                 const struct iovec __user *vec,
 652                 unsigned long vlen, loff_t pos);
 653 #endif
 654
 655 /* fs/sendfile.c */
 656 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 657                                     compat_off_t __user *offset, compat_size_t count);
 658 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 659                                     compat_loff_t __user *offset, compat_size_t count);
 660
 661 /* fs/select.c */
 662 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 663                                     compat_ulong_t __user *outp,
 664                                     compat_ulong_t __user *exp,
 665                                     struct old_timespec32 __user *tsp,
 666                                     void __user *sig);
 667 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 668                                     compat_ulong_t __user *outp,
 669                                     compat_ulong_t __user *exp,
 670                                     struct __kernel_timespec __user *tsp,
 671                                     void __user *sig);
 672 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 673                                  unsigned int nfds,
 674                                  struct old_timespec32 __user *tsp,
 675                                  const compat_sigset_t __user *sigmask,
 676                                  compat_size_t sigsetsize);
 677 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 678                                  unsigned int nfds,
 679                                  struct __kernel_timespec __user *tsp,
 680                                  const compat_sigset_t __user *sigmask,
 681                                  compat_size_t sigsetsize);
 682
 683 /* fs/signalfd.c */
 684 asmlinkage long compat_sys_signalfd4(int ufd,
 685                                      const compat_sigset_t __user *sigmask,
 686                                      compat_size_t sigsetsize, int flags);
 687
 688 /* fs/stat.c */
 689 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 690                                       const char __user *filename,
 691                                       struct compat_stat __user *statbuf,
 692                                       int flag);
 693 asmlinkage long compat_sys_newfstat(unsigned int fd,
 694                                     struct compat_stat __user *statbuf);
 695
 696 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 697
 698 /* kernel/exit.c */
 699 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 700                 struct compat_siginfo __user *, int,
 701                 struct compat_rusage __user *);
 702
 703
 704
 705 /* kernel/futex.c */
 706 asmlinkage long
 707 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 708                            compat_size_t len);
 709 asmlinkage long
 710 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 711                            compat_size_t __user *len_ptr);
 712
 713 /* kernel/itimer.c */
 714 asmlinkage long compat_sys_getitimer(int which,
 715                                      struct old_itimerval32 __user *it);
 716 asmlinkage long compat_sys_setitimer(int which,
 717                                      struct old_itimerval32 __user *in,
 718                                      struct old_itimerval32 __user *out);
 719
 720 /* kernel/kexec.c */
 721 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 722                                       compat_ulong_t nr_segments,
 723                                       struct compat_kexec_segment __user *,
 724                                       compat_ulong_t flags);
 725
 726 /* kernel/posix-timers.c */
 727 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 728                         struct compat_sigevent __user *timer_event_spec,
 729                         timer_t __user *created_timer_id);
 730
 731 /* kernel/ptrace.c */
 732 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 733                                   compat_long_t addr, compat_long_t data);
 734
 735 /* kernel/sched/core.c */
 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
 743 /* kernel/signal.c */
 744 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 745                                        compat_stack_t __user *uoss_ptr);
 746 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 747                                          compat_size_t sigsetsize);
 748 #ifndef CONFIG_ODD_RT_SIGACTION
 749 asmlinkage long compat_sys_rt_sigaction(int,
 750                                  const struct compat_sigaction __user *,
 751                                  struct compat_sigaction __user *,
 752                                  compat_size_t);
 753 #endif
 754 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 755                                           compat_sigset_t __user *oset,
 756                                           compat_size_t sigsetsize);
 757 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 758                                          compat_size_t sigsetsize);
 759 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 760                 struct compat_siginfo __user *uinfo,
 761                 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 762 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 763                 struct compat_siginfo __user *uinfo,
 764                 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 765 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 766                                 struct compat_siginfo __user *uinfo);
 767 /* No generic prototype for rt_sigreturn */
 768
 769 /* kernel/sys.c */
 770 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 771 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 772                                      struct compat_rlimit __user *rlim);
 773 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 774                                      struct compat_rlimit __user *rlim);
 775 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 776
 777 /* kernel/time.c */
 778 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 779                 struct timezone __user *tz);
 780 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 781                 struct timezone __user *tz);
 782
 783 /* kernel/timer.c */
 784 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 785
 786 /* ipc/mqueue.c */
 787 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 788                         int oflag, compat_mode_t mode,
 789                         struct compat_mq_attr __user *u_attr);
 790 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 791                         const struct compat_sigevent __user *u_notification);
 792 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 793                         const struct compat_mq_attr __user *u_mqstat,
 794                         struct compat_mq_attr __user *u_omqstat);
 795
 796 /* ipc/msg.c */
 797 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 798 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 799                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 800 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 801                 compat_ssize_t msgsz, int msgflg);
 802
 803 /* ipc/sem.c */
 804 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 805
 806 /* ipc/shm.c */
 807 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 808 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 809
 810 /* net/socket.c */
 811 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 812                             unsigned flags, struct sockaddr __user *addr,
 813                             int __user *addrlen);
 814 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 815                                    unsigned flags);
 816 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 817                                    unsigned int flags);
 818
 819 /* mm/filemap.c: No generic prototype for readahead */
 820
 821 /* security/keys/keyctl.c */
 822 asmlinkage long compat_sys_keyctl(u32 option,
 823                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 824
 825 /* arch/example/kernel/sys_example.c */
 826 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 827                      const compat_uptr_t __user *envp);
 828
 829 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 830
 831 /* mm/, CONFIG_MMU only */
 832 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 833                                         compat_pid_t pid, int sig,
 834                                         struct compat_siginfo __user *uinfo);
 835 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 836                                     unsigned vlen, unsigned int flags,
 837                                     struct __kernel_timespec __user *timeout);
 838 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 839                                     unsigned vlen, unsigned int flags,
 840                                     struct old_timespec32 __user *timeout);
 841 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 842                                  compat_uint_t __user *stat_addr, int options,
 843                                  struct compat_rusage __user *ru);
 844 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 845                                             int, const char __user *);
 846 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 847                                              struct file_handle __user *handle,
 848                                              int flags);
 849 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 850                                     unsigned vlen, unsigned int flags);
 851 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 852                      const compat_uptr_t __user *argv,
 853                      const compat_uptr_t __user *envp, int flags);
 854 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 855                 const struct iovec __user *vec,
 856                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 857 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 858                 const struct iovec __user *vec,
 859                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 860 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 861 asmlinkage long  compat_sys_preadv64v2(unsigned long fd,
 862                 const struct iovec __user *vec,
 863                 unsigned long vlen, loff_t pos, rwf_t flags);
 864 #endif
 865
 866 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 867 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 868                 const struct iovec __user *vec,
 869                 unsigned long vlen, loff_t pos, rwf_t flags);
 870 #endif
 871
 872
 873 /*
 874  * Deprecated system calls which are still defined in
 875  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 876  */
 877
 878 /* __ARCH_WANT_SYSCALL_NO_AT */
 879 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 880                                 umode_t mode);
 881
 882 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 883 asmlinkage long compat_sys_signalfd(int ufd,
 884                                     const compat_sigset_t __user *sigmask,
 885                                     compat_size_t sigsetsize);
 886
 887 /* __ARCH_WANT_SYSCALL_OFF_T */
 888 asmlinkage long compat_sys_newstat(const char __user *filename,
 889                                    struct compat_stat __user *statbuf);
 890 asmlinkage long compat_sys_newlstat(const char __user *filename,
 891                                     struct compat_stat __user *statbuf);
 892
 893 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 894 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 895                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 896                 struct old_timeval32 __user *tvp);
 897 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 898 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 899                                 unsigned flags);
 900
 901 /* obsolete: fs/readdir.c */
 902 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 903                                        struct compat_old_linux_dirent __user *,
 904                                        unsigned int count);
 905
 906 /* obsolete: fs/select.c */
 907 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 908
 909 /* obsolete: ipc */
 910 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 911
 912 /* obsolete: kernel/signal.c */
 913 #ifdef __ARCH_WANT_SYS_SIGPENDING
 914 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 915 #endif
 916
 917 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 918 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 919                                        compat_old_sigset_t __user *oset);
 920 #endif
 921 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 922 asmlinkage long compat_sys_sigaction(int sig,
 923                                    const struct compat_old_sigaction __user *act,
 924                                    struct compat_old_sigaction __user *oact);
 925 #endif
 926
 927 /* obsolete: net/socket.c */
 928 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 929
 930 #ifdef __ARCH_WANT_COMPAT_TRUNCATE64
 931 asmlinkage long compat_sys_truncate64(const char __user *pathname, compat_arg_u64(len));
 932 #endif
 933
 934 #ifdef __ARCH_WANT_COMPAT_FTRUNCATE64
 935 asmlinkage long compat_sys_ftruncate64(unsigned int fd, compat_arg_u64(len));
 936 #endif
 937
 938 #ifdef __ARCH_WANT_COMPAT_FALLOCATE
 939 asmlinkage long compat_sys_fallocate(int fd, int mode, compat_arg_u64(offset),
 940                                      compat_arg_u64(len));
 941 #endif
 942
 943 #ifdef __ARCH_WANT_COMPAT_PREAD64
 944 asmlinkage long compat_sys_pread64(unsigned int fd, char __user *buf, size_t count,
 945                                    compat_arg_u64(pos));
 946 #endif
 947
 948 #ifdef __ARCH_WANT_COMPAT_PWRITE64
 949 asmlinkage long compat_sys_pwrite64(unsigned int fd, const char __user *buf, size_t count,
 950                                     compat_arg_u64(pos));
 951 #endif
 952
 953 #ifdef __ARCH_WANT_COMPAT_SYNC_FILE_RANGE
 954 asmlinkage long compat_sys_sync_file_range(int fd, compat_arg_u64(pos),
 955                                            compat_arg_u64(nbytes), unsigned int flags);
 956 #endif
 957
 958 #ifdef __ARCH_WANT_COMPAT_FADVISE64_64
 959 asmlinkage long compat_sys_fadvise64_64(int fd, compat_arg_u64(pos),
 960                                         compat_arg_u64(len), int advice);
 961 #endif
 962
 963 #ifdef __ARCH_WANT_COMPAT_READAHEAD
 964 asmlinkage long compat_sys_readahead(int fd, compat_arg_u64(offset), size_t count);
 965 #endif
 966
 967 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 968
 969 /**
 970  * ns_to_old_timeval32 - Compat version of ns_to_timeval
 971  * @nsec:       the nanoseconds value to be converted
 972  *
 973  * Returns the old_timeval32 representation of the nsec parameter.
 974  */
 975 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
 976 {
 977         struct __kernel_old_timeval tv;
 978         struct old_timeval32 ctv;
 979
 980         tv = ns_to_kernel_old_timeval(nsec);
 981         ctv.tv_sec = tv.tv_sec;
 982         ctv.tv_usec = tv.tv_usec;
 983
 984         return ctv;
 985 }
 986
 987 /*
 988  * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 989  * directly.  Instead, use one of the functions which work equivalently, such
 990  * as the kcompat_sys_xyzyyz() functions prototyped below.
 991  */
 992
 993 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 994                      struct compat_statfs64 __user * buf);
 995 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 996                           struct compat_statfs64 __user * buf);
 997
 998 #ifdef CONFIG_COMPAT
 999
1000 /*
1001  * For most but not all architectures, "am I in a compat syscall?" and
1002  * "am I a compat task?" are the same question.  For architectures on which
1003  * they aren't the same question, arch code can override in_compat_syscall.
1004  */
1005 #ifndef in_compat_syscall
1006 static inline bool in_compat_syscall(void) { return is_compat_task(); }
1007 #endif
1008
1009 #else /* !CONFIG_COMPAT */
1010
1011 #define is_compat_task() (0)
1012 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
1013 #define in_compat_syscall in_compat_syscall
1014 static inline bool in_compat_syscall(void) { return false; }
1015
1016 #endif /* CONFIG_COMPAT */
1017
1018 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
1019
1020 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
1021
1022 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
1023                        unsigned long bitmap_size);
1024 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
1025                        unsigned long bitmap_size);
1026
1027 /*
1028  * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
1029  * types, and will need special compat treatment for that.  Most architectures
1030  * don't need that special handling even for compat syscalls.
1031  */
1032 #ifndef compat_need_64bit_alignment_fixup
1033 #define compat_need_64bit_alignment_fixup()             false
1034 #endif
1035
1036 /*
1037  * A pointer passed in from user mode. This should not
1038  * be used for syscall parameters, just declare them
1039  * as pointers because the syscall entry code will have
1040  * appropriately converted them already.
1041  */
1042 #ifndef compat_ptr
1043 static inline void __user *compat_ptr(compat_uptr_t uptr)
1044 {
1045         return (void __user *)(unsigned long)uptr;
1046 }
1047 #endif
1048
1049 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
1050 {
1051         return (u32)(unsigned long)uptr;
1052 }
1053
1054 #endif /* _LINUX_COMPAT_H */