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 struct compat_rusage {
 263         struct old_timeval32 ru_utime;
 264         struct old_timeval32 ru_stime;
 265         compat_long_t   ru_maxrss;
 266         compat_long_t   ru_ixrss;
 267         compat_long_t   ru_idrss;
 268         compat_long_t   ru_isrss;
 269         compat_long_t   ru_minflt;
 270         compat_long_t   ru_majflt;
 271         compat_long_t   ru_nswap;
 272         compat_long_t   ru_inblock;
 273         compat_long_t   ru_oublock;
 274         compat_long_t   ru_msgsnd;
 275         compat_long_t   ru_msgrcv;
 276         compat_long_t   ru_nsignals;
 277         compat_long_t   ru_nvcsw;
 278         compat_long_t   ru_nivcsw;
 279 };
 280
 281 extern int put_compat_rusage(const struct rusage *,
 282                              struct compat_rusage __user *);
 283
 284 struct compat_siginfo;
 285 struct __compat_aio_sigset;
 286
 287 struct compat_dirent {
 288         u32             d_ino;
 289         compat_off_t    d_off;
 290         u16             d_reclen;
 291         char            d_name[256];
 292 };
 293
 294 struct compat_ustat {
 295         compat_daddr_t          f_tfree;
 296         compat_ino_t            f_tinode;
 297         char                    f_fname[6];
 298         char                    f_fpack[6];
 299 };
 300
 301 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 302
 303 typedef struct compat_sigevent {
 304         compat_sigval_t sigev_value;
 305         compat_int_t sigev_signo;
 306         compat_int_t sigev_notify;
 307         union {
 308                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 309                 compat_int_t _tid;
 310
 311                 struct {
 312                         compat_uptr_t _function;
 313                         compat_uptr_t _attribute;
 314                 } _sigev_thread;
 315         } _sigev_un;
 316 } compat_sigevent_t;
 317
 318 struct compat_ifmap {
 319         compat_ulong_t mem_start;
 320         compat_ulong_t mem_end;
 321         unsigned short base_addr;
 322         unsigned char irq;
 323         unsigned char dma;
 324         unsigned char port;
 325 };
 326
 327 struct compat_if_settings {
 328         unsigned int type;      /* Type of physical device or protocol */
 329         unsigned int size;      /* Size of the data allocated by the caller */
 330         compat_uptr_t ifs_ifsu; /* union of pointers */
 331 };
 332
 333 struct compat_ifreq {
 334         union {
 335                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 336         } ifr_ifrn;
 337         union {
 338                 struct  sockaddr ifru_addr;
 339                 struct  sockaddr ifru_dstaddr;
 340                 struct  sockaddr ifru_broadaddr;
 341                 struct  sockaddr ifru_netmask;
 342                 struct  sockaddr ifru_hwaddr;
 343                 short   ifru_flags;
 344                 compat_int_t    ifru_ivalue;
 345                 compat_int_t    ifru_mtu;
 346                 struct  compat_ifmap ifru_map;
 347                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 348                 char    ifru_newname[IFNAMSIZ];
 349                 compat_caddr_t  ifru_data;
 350                 struct  compat_if_settings ifru_settings;
 351         } ifr_ifru;
 352 };
 353
 354 struct compat_ifconf {
 355         compat_int_t    ifc_len;                /* size of buffer */
 356         compat_caddr_t  ifcbuf;
 357 };
 358
 359 struct compat_robust_list {
 360         compat_uptr_t                   next;
 361 };
 362
 363 struct compat_robust_list_head {
 364         struct compat_robust_list       list;
 365         compat_long_t                   futex_offset;
 366         compat_uptr_t                   list_op_pending;
 367 };
 368
 369 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 370 struct compat_old_sigaction {
 371         compat_uptr_t                   sa_handler;
 372         compat_old_sigset_t             sa_mask;
 373         compat_ulong_t                  sa_flags;
 374         compat_uptr_t                   sa_restorer;
 375 };
 376 #endif
 377
 378 struct compat_keyctl_kdf_params {
 379         compat_uptr_t hashname;
 380         compat_uptr_t otherinfo;
 381         __u32 otherinfolen;
 382         __u32 __spare[8];
 383 };
 384
 385 struct compat_stat;
 386 struct compat_statfs;
 387 struct compat_statfs64;
 388 struct compat_old_linux_dirent;
 389 struct compat_linux_dirent;
 390 struct linux_dirent64;
 391 struct compat_msghdr;
 392 struct compat_mmsghdr;
 393 struct compat_sysinfo;
 394 struct compat_sysctl_args;
 395 struct compat_kexec_segment;
 396 struct compat_mq_attr;
 397 struct compat_msgbuf;
 398
 399 void copy_siginfo_to_external32(struct compat_siginfo *to,
 400                 const struct kernel_siginfo *from);
 401 int copy_siginfo_from_user32(kernel_siginfo_t *to,
 402                 const struct compat_siginfo __user *from);
 403 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
 404                 const kernel_siginfo_t *from);
 405 #ifndef copy_siginfo_to_user32
 406 #define copy_siginfo_to_user32 __copy_siginfo_to_user32
 407 #endif
 408 int get_compat_sigevent(struct sigevent *event,
 409                 const struct compat_sigevent __user *u_event);
 410
 411 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 412
 413 /*
 414  * Defined inline such that size can be compile time constant, which avoids
 415  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
 416  */
 417 static inline int
 418 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 419                   unsigned int size)
 420 {
 421         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
 422 #if defined(__BIG_ENDIAN) && defined(CONFIG_64BIT)
 423         compat_sigset_t v;
 424         switch (_NSIG_WORDS) {
 425         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
 426                 fallthrough;
 427         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
 428                 fallthrough;
 429         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
 430                 fallthrough;
 431         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 432         }
 433         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
 434 #else
 435         return copy_to_user(compat, set, size) ? -EFAULT : 0;
 436 #endif
 437 }
 438
 439 #ifdef CONFIG_CPU_BIG_ENDIAN
 440 #define unsafe_put_compat_sigset(compat, set, label) do {               \
 441         compat_sigset_t __user *__c = compat;                           \
 442         const sigset_t *__s = set;                                      \
 443                                                                         \
 444         switch (_NSIG_WORDS) {                                          \
 445         case 4:                                                         \
 446                 unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label);        \
 447                 unsafe_put_user(__s->sig[3], &__c->sig[6], label);      \
 448                 fallthrough;                                            \
 449         case 3:                                                         \
 450                 unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label);        \
 451                 unsafe_put_user(__s->sig[2], &__c->sig[4], label);      \
 452                 fallthrough;                                            \
 453         case 2:                                                         \
 454                 unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label);        \
 455                 unsafe_put_user(__s->sig[1], &__c->sig[2], label);      \
 456                 fallthrough;                                            \
 457         case 1:                                                         \
 458                 unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label);        \
 459                 unsafe_put_user(__s->sig[0], &__c->sig[0], label);      \
 460         }                                                               \
 461 } while (0)
 462
 463 #define unsafe_get_compat_sigset(set, compat, label) do {               \
 464         const compat_sigset_t __user *__c = compat;                     \
 465         compat_sigset_word hi, lo;                                      \
 466         sigset_t *__s = set;                                            \
 467                                                                         \
 468         switch (_NSIG_WORDS) {                                          \
 469         case 4:                                                         \
 470                 unsafe_get_user(lo, &__c->sig[7], label);               \
 471                 unsafe_get_user(hi, &__c->sig[6], label);               \
 472                 __s->sig[3] = hi | (((long)lo) << 32);                  \
 473                 fallthrough;                                            \
 474         case 3:                                                         \
 475                 unsafe_get_user(lo, &__c->sig[5], label);               \
 476                 unsafe_get_user(hi, &__c->sig[4], label);               \
 477                 __s->sig[2] = hi | (((long)lo) << 32);                  \
 478                 fallthrough;                                            \
 479         case 2:                                                         \
 480                 unsafe_get_user(lo, &__c->sig[3], label);               \
 481                 unsafe_get_user(hi, &__c->sig[2], label);               \
 482                 __s->sig[1] = hi | (((long)lo) << 32);                  \
 483                 fallthrough;                                            \
 484         case 1:                                                         \
 485                 unsafe_get_user(lo, &__c->sig[1], label);               \
 486                 unsafe_get_user(hi, &__c->sig[0], label);               \
 487                 __s->sig[0] = hi | (((long)lo) << 32);                  \
 488         }                                                               \
 489 } while (0)
 490 #else
 491 #define unsafe_put_compat_sigset(compat, set, label) do {               \
 492         compat_sigset_t __user *__c = compat;                           \
 493         const sigset_t *__s = set;                                      \
 494                                                                         \
 495         unsafe_copy_to_user(__c, __s, sizeof(*__c), label);             \
 496 } while (0)
 497
 498 #define unsafe_get_compat_sigset(set, compat, label) do {               \
 499         const compat_sigset_t __user *__c = compat;                     \
 500         sigset_t *__s = set;                                            \
 501                                                                         \
 502         unsafe_copy_from_user(__s, __c, sizeof(*__c), label);           \
 503 } while (0)
 504 #endif
 505
 506 extern int compat_ptrace_request(struct task_struct *child,
 507                                  compat_long_t request,
 508                                  compat_ulong_t addr, compat_ulong_t data);
 509
 510 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 511                                compat_ulong_t addr, compat_ulong_t data);
 512
 513 struct epoll_event;     /* fortunately, this one is fixed-layout */
 514
 515 int compat_restore_altstack(const compat_stack_t __user *uss);
 516 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 517 #define unsafe_compat_save_altstack(uss, sp, label) do { \
 518         compat_stack_t __user *__uss = uss; \
 519         struct task_struct *t = current; \
 520         unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
 521                         &__uss->ss_sp, label); \
 522         unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
 523         unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
 524 } while (0);
 525
 526 /*
 527  * These syscall function prototypes are kept in the same order as
 528  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
 529  * go below.
 530  *
 531  * Please note that these prototypes here are only provided for information
 532  * purposes, for static analysis, and for linking from the syscall table.
 533  * These functions should not be called elsewhere from kernel code.
 534  *
 535  * As the syscall calling convention may be different from the default
 536  * for architectures overriding the syscall calling convention, do not
 537  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 538  */
 539 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 540 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 541 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 542                                      u32 __user *iocb);
 543 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
 544                                         compat_long_t min_nr,
 545                                         compat_long_t nr,
 546                                         struct io_event __user *events,
 547                                         struct old_timespec32 __user *timeout,
 548                                         const struct __compat_aio_sigset __user *usig);
 549 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
 550                                         compat_long_t min_nr,
 551                                         compat_long_t nr,
 552                                         struct io_event __user *events,
 553                                         struct __kernel_timespec __user *timeout,
 554                                         const struct __compat_aio_sigset __user *usig);
 555
 556 /* fs/cookies.c */
 557 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 558
 559 /* fs/eventpoll.c */
 560 asmlinkage long compat_sys_epoll_pwait(int epfd,
 561                         struct epoll_event __user *events,
 562                         int maxevents, int timeout,
 563                         const compat_sigset_t __user *sigmask,
 564                         compat_size_t sigsetsize);
 565 asmlinkage long compat_sys_epoll_pwait2(int epfd,
 566                         struct epoll_event __user *events,
 567                         int maxevents,
 568                         const struct __kernel_timespec __user *timeout,
 569                         const compat_sigset_t __user *sigmask,
 570                         compat_size_t sigsetsize);
 571
 572 /* fs/fcntl.c */
 573 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 574                                  compat_ulong_t arg);
 575 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 576                                    compat_ulong_t arg);
 577
 578 /* fs/ioctl.c */
 579 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 580                                  compat_ulong_t arg);
 581
 582 /* fs/open.c */
 583 asmlinkage long compat_sys_statfs(const char __user *pathname,
 584                                   struct compat_statfs __user *buf);
 585 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 586                                     compat_size_t sz,
 587                                     struct compat_statfs64 __user *buf);
 588 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 589                                    struct compat_statfs __user *buf);
 590 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 591                                      struct compat_statfs64 __user *buf);
 592 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 593 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 594 /* No generic prototype for truncate64, ftruncate64, fallocate */
 595 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 596                                   int flags, umode_t mode);
 597
 598 /* fs/readdir.c */
 599 asmlinkage long compat_sys_getdents(unsigned int fd,
 600                                     struct compat_linux_dirent __user *dirent,
 601                                     unsigned int count);
 602
 603 /* fs/read_write.c */
 604 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 605 /* No generic prototype for pread64 and pwrite64 */
 606 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 607                 const struct iovec __user *vec,
 608                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 609 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 610                 const struct iovec __user *vec,
 611                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 612 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 613 asmlinkage long compat_sys_preadv64(unsigned long fd,
 614                 const struct iovec __user *vec,
 615                 unsigned long vlen, loff_t pos);
 616 #endif
 617
 618 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 619 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 620                 const struct iovec __user *vec,
 621                 unsigned long vlen, loff_t pos);
 622 #endif
 623
 624 /* fs/sendfile.c */
 625 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 626                                     compat_off_t __user *offset, compat_size_t count);
 627 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 628                                     compat_loff_t __user *offset, compat_size_t count);
 629
 630 /* fs/select.c */
 631 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
 632                                     compat_ulong_t __user *outp,
 633                                     compat_ulong_t __user *exp,
 634                                     struct old_timespec32 __user *tsp,
 635                                     void __user *sig);
 636 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
 637                                     compat_ulong_t __user *outp,
 638                                     compat_ulong_t __user *exp,
 639                                     struct __kernel_timespec __user *tsp,
 640                                     void __user *sig);
 641 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
 642                                  unsigned int nfds,
 643                                  struct old_timespec32 __user *tsp,
 644                                  const compat_sigset_t __user *sigmask,
 645                                  compat_size_t sigsetsize);
 646 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
 647                                  unsigned int nfds,
 648                                  struct __kernel_timespec __user *tsp,
 649                                  const compat_sigset_t __user *sigmask,
 650                                  compat_size_t sigsetsize);
 651
 652 /* fs/signalfd.c */
 653 asmlinkage long compat_sys_signalfd4(int ufd,
 654                                      const compat_sigset_t __user *sigmask,
 655                                      compat_size_t sigsetsize, int flags);
 656
 657 /* fs/stat.c */
 658 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 659                                       const char __user *filename,
 660                                       struct compat_stat __user *statbuf,
 661                                       int flag);
 662 asmlinkage long compat_sys_newfstat(unsigned int fd,
 663                                     struct compat_stat __user *statbuf);
 664
 665 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
 666
 667 /* kernel/exit.c */
 668 asmlinkage long compat_sys_waitid(int, compat_pid_t,
 669                 struct compat_siginfo __user *, int,
 670                 struct compat_rusage __user *);
 671
 672
 673
 674 /* kernel/futex.c */
 675 asmlinkage long
 676 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 677                            compat_size_t len);
 678 asmlinkage long
 679 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 680                            compat_size_t __user *len_ptr);
 681
 682 /* kernel/itimer.c */
 683 asmlinkage long compat_sys_getitimer(int which,
 684                                      struct old_itimerval32 __user *it);
 685 asmlinkage long compat_sys_setitimer(int which,
 686                                      struct old_itimerval32 __user *in,
 687                                      struct old_itimerval32 __user *out);
 688
 689 /* kernel/kexec.c */
 690 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 691                                       compat_ulong_t nr_segments,
 692                                       struct compat_kexec_segment __user *,
 693                                       compat_ulong_t flags);
 694
 695 /* kernel/posix-timers.c */
 696 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 697                         struct compat_sigevent __user *timer_event_spec,
 698                         timer_t __user *created_timer_id);
 699
 700 /* kernel/ptrace.c */
 701 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 702                                   compat_long_t addr, compat_long_t data);
 703
 704 /* kernel/sched/core.c */
 705 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 706                                      unsigned int len,
 707                                      compat_ulong_t __user *user_mask_ptr);
 708 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 709                                      unsigned int len,
 710                                      compat_ulong_t __user *user_mask_ptr);
 711
 712 /* kernel/signal.c */
 713 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 714                                        compat_stack_t __user *uoss_ptr);
 715 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 716                                          compat_size_t sigsetsize);
 717 #ifndef CONFIG_ODD_RT_SIGACTION
 718 asmlinkage long compat_sys_rt_sigaction(int,
 719                                  const struct compat_sigaction __user *,
 720                                  struct compat_sigaction __user *,
 721                                  compat_size_t);
 722 #endif
 723 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 724                                           compat_sigset_t __user *oset,
 725                                           compat_size_t sigsetsize);
 726 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 727                                          compat_size_t sigsetsize);
 728 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
 729                 struct compat_siginfo __user *uinfo,
 730                 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
 731 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
 732                 struct compat_siginfo __user *uinfo,
 733                 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
 734 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 735                                 struct compat_siginfo __user *uinfo);
 736 /* No generic prototype for rt_sigreturn */
 737
 738 /* kernel/sys.c */
 739 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 740 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 741                                      struct compat_rlimit __user *rlim);
 742 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 743                                      struct compat_rlimit __user *rlim);
 744 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 745
 746 /* kernel/time.c */
 747 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 748                 struct timezone __user *tz);
 749 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 750                 struct timezone __user *tz);
 751
 752 /* kernel/timer.c */
 753 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 754
 755 /* ipc/mqueue.c */
 756 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 757                         int oflag, compat_mode_t mode,
 758                         struct compat_mq_attr __user *u_attr);
 759 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 760                         const struct compat_sigevent __user *u_notification);
 761 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 762                         const struct compat_mq_attr __user *u_mqstat,
 763                         struct compat_mq_attr __user *u_omqstat);
 764
 765 /* ipc/msg.c */
 766 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
 767 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 768                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 769 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 770                 compat_ssize_t msgsz, int msgflg);
 771
 772 /* ipc/sem.c */
 773 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 774
 775 /* ipc/shm.c */
 776 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
 777 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 778
 779 /* net/socket.c */
 780 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 781                             unsigned flags, struct sockaddr __user *addr,
 782                             int __user *addrlen);
 783 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 784                                    unsigned flags);
 785 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 786                                    unsigned int flags);
 787
 788 /* mm/filemap.c: No generic prototype for readahead */
 789
 790 /* security/keys/keyctl.c */
 791 asmlinkage long compat_sys_keyctl(u32 option,
 792                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 793
 794 /* arch/example/kernel/sys_example.c */
 795 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 796                      const compat_uptr_t __user *envp);
 797
 798 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
 799
 800 /* mm/, CONFIG_MMU only */
 801 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
 802                                         compat_pid_t pid, int sig,
 803                                         struct compat_siginfo __user *uinfo);
 804 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
 805                                     unsigned vlen, unsigned int flags,
 806                                     struct __kernel_timespec __user *timeout);
 807 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
 808                                     unsigned vlen, unsigned int flags,
 809                                     struct old_timespec32 __user *timeout);
 810 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 811                                  compat_uint_t __user *stat_addr, int options,
 812                                  struct compat_rusage __user *ru);
 813 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 814                                             int, const char __user *);
 815 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 816                                              struct file_handle __user *handle,
 817                                              int flags);
 818 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 819                                     unsigned vlen, unsigned int flags);
 820 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 821                      const compat_uptr_t __user *argv,
 822                      const compat_uptr_t __user *envp, int flags);
 823 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 824                 const struct iovec __user *vec,
 825                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 826 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 827                 const struct iovec __user *vec,
 828                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 829 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 830 asmlinkage long  compat_sys_preadv64v2(unsigned long fd,
 831                 const struct iovec __user *vec,
 832                 unsigned long vlen, loff_t pos, rwf_t flags);
 833 #endif
 834
 835 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 836 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 837                 const struct iovec __user *vec,
 838                 unsigned long vlen, loff_t pos, rwf_t flags);
 839 #endif
 840
 841
 842 /*
 843  * Deprecated system calls which are still defined in
 844  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 845  */
 846
 847 /* __ARCH_WANT_SYSCALL_NO_AT */
 848 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 849                                 umode_t mode);
 850
 851 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
 852 asmlinkage long compat_sys_signalfd(int ufd,
 853                                     const compat_sigset_t __user *sigmask,
 854                                     compat_size_t sigsetsize);
 855
 856 /* __ARCH_WANT_SYSCALL_OFF_T */
 857 asmlinkage long compat_sys_newstat(const char __user *filename,
 858                                    struct compat_stat __user *statbuf);
 859 asmlinkage long compat_sys_newlstat(const char __user *filename,
 860                                     struct compat_stat __user *statbuf);
 861
 862 /* __ARCH_WANT_SYSCALL_DEPRECATED */
 863 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 864                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 865                 struct old_timeval32 __user *tvp);
 866 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 867 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 868                                 unsigned flags);
 869
 870 /* obsolete: fs/readdir.c */
 871 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 872                                        struct compat_old_linux_dirent __user *,
 873                                        unsigned int count);
 874
 875 /* obsolete: fs/select.c */
 876 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 877
 878 /* obsolete: ipc */
 879 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 880
 881 /* obsolete: kernel/signal.c */
 882 #ifdef __ARCH_WANT_SYS_SIGPENDING
 883 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 884 #endif
 885
 886 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 887 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 888                                        compat_old_sigset_t __user *oset);
 889 #endif
 890 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 891 asmlinkage long compat_sys_sigaction(int sig,
 892                                    const struct compat_old_sigaction __user *act,
 893                                    struct compat_old_sigaction __user *oact);
 894 #endif
 895
 896 /* obsolete: net/socket.c */
 897 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 898
 899 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 900
 901 /**
 902  * ns_to_old_timeval32 - Compat version of ns_to_timeval
 903  * @nsec:       the nanoseconds value to be converted
 904  *
 905  * Returns the old_timeval32 representation of the nsec parameter.
 906  */
 907 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
 908 {
 909         struct __kernel_old_timeval tv;
 910         struct old_timeval32 ctv;
 911
 912         tv = ns_to_kernel_old_timeval(nsec);
 913         ctv.tv_sec = tv.tv_sec;
 914         ctv.tv_usec = tv.tv_usec;
 915
 916         return ctv;
 917 }
 918
 919 /*
 920  * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 921  * directly.  Instead, use one of the functions which work equivalently, such
 922  * as the kcompat_sys_xyzyyz() functions prototyped below.
 923  */
 924
 925 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 926                      struct compat_statfs64 __user * buf);
 927 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 928                           struct compat_statfs64 __user * buf);
 929
 930 #ifdef CONFIG_COMPAT
 931
 932 /*
 933  * For most but not all architectures, "am I in a compat syscall?" and
 934  * "am I a compat task?" are the same question.  For architectures on which
 935  * they aren't the same question, arch code can override in_compat_syscall.
 936  */
 937 #ifndef in_compat_syscall
 938 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 939 #endif
 940
 941 #else /* !CONFIG_COMPAT */
 942
 943 #define is_compat_task() (0)
 944 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
 945 #define in_compat_syscall in_compat_syscall
 946 static inline bool in_compat_syscall(void) { return false; }
 947
 948 #endif /* CONFIG_COMPAT */
 949
 950 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 951
 952 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 953
 954 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 955                        unsigned long bitmap_size);
 956 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 957                        unsigned long bitmap_size);
 958
 959 /*
 960  * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
 961  * types, and will need special compat treatment for that.  Most architectures
 962  * don't need that special handling even for compat syscalls.
 963  */
 964 #ifndef compat_need_64bit_alignment_fixup
 965 #define compat_need_64bit_alignment_fixup()             false
 966 #endif
 967
 968 /*
 969  * A pointer passed in from user mode. This should not
 970  * be used for syscall parameters, just declare them
 971  * as pointers because the syscall entry code will have
 972  * appropriately converted them already.
 973  */
 974 #ifndef compat_ptr
 975 static inline void __user *compat_ptr(compat_uptr_t uptr)
 976 {
 977         return (void __user *)(unsigned long)uptr;
 978 }
 979 #endif
 980
 981 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 982 {
 983         return (u32)(unsigned long)uptr;
 984 }
 985
 986 #endif /* _LINUX_COMPAT_H */