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 } _perf; 239 }; 240 } _sigfault; 241 242 /* SIGPOLL */ 243 struct { 244 compat_long_t _band; /* POLL_IN, POLL_OUT, POLL_MSG */ 245 int _fd; 246 } _sigpoll; 247 248 struct { 249 compat_uptr_t _call_addr; /* calling user insn */ 250 int _syscall; /* triggering system call number */ 251 unsigned int _arch; /* AUDIT_ARCH_* of syscall */ 252 } _sigsys; 253 } _sifields; 254 } compat_siginfo_t; 255 256 struct compat_rlimit { 257 compat_ulong_t rlim_cur; 258 compat_ulong_t rlim_max; 259 }; 260 261 struct compat_rusage { 262 struct old_timeval32 ru_utime; 263 struct old_timeval32 ru_stime; 264 compat_long_t ru_maxrss; 265 compat_long_t ru_ixrss; 266 compat_long_t ru_idrss; 267 compat_long_t ru_isrss; 268 compat_long_t ru_minflt; 269 compat_long_t ru_majflt; 270 compat_long_t ru_nswap; 271 compat_long_t ru_inblock; 272 compat_long_t ru_oublock; 273 compat_long_t ru_msgsnd; 274 compat_long_t ru_msgrcv; 275 compat_long_t ru_nsignals; 276 compat_long_t ru_nvcsw; 277 compat_long_t ru_nivcsw; 278 }; 279 280 extern int put_compat_rusage(const struct rusage *, 281 struct compat_rusage __user *); 282 283 struct compat_siginfo; 284 struct __compat_aio_sigset; 285 286 struct compat_dirent { 287 u32 d_ino; 288 compat_off_t d_off; 289 u16 d_reclen; 290 char d_name[256]; 291 }; 292 293 struct compat_ustat { 294 compat_daddr_t f_tfree; 295 compat_ino_t f_tinode; 296 char f_fname[6]; 297 char f_fpack[6]; 298 }; 299 300 #define COMPAT_SIGEV_PAD_SIZE ((SIGEV_MAX_SIZE/sizeof(int)) - 3) 301 302 typedef struct compat_sigevent { 303 compat_sigval_t sigev_value; 304 compat_int_t sigev_signo; 305 compat_int_t sigev_notify; 306 union { 307 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE]; 308 compat_int_t _tid; 309 310 struct { 311 compat_uptr_t _function; 312 compat_uptr_t _attribute; 313 } _sigev_thread; 314 } _sigev_un; 315 } compat_sigevent_t; 316 317 struct compat_ifmap { 318 compat_ulong_t mem_start; 319 compat_ulong_t mem_end; 320 unsigned short base_addr; 321 unsigned char irq; 322 unsigned char dma; 323 unsigned char port; 324 }; 325 326 struct compat_if_settings { 327 unsigned int type; /* Type of physical device or protocol */ 328 unsigned int size; /* Size of the data allocated by the caller */ 329 compat_uptr_t ifs_ifsu; /* union of pointers */ 330 }; 331 332 struct compat_ifreq { 333 union { 334 char ifrn_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 335 } ifr_ifrn; 336 union { 337 struct sockaddr ifru_addr; 338 struct sockaddr ifru_dstaddr; 339 struct sockaddr ifru_broadaddr; 340 struct sockaddr ifru_netmask; 341 struct sockaddr ifru_hwaddr; 342 short ifru_flags; 343 compat_int_t ifru_ivalue; 344 compat_int_t ifru_mtu; 345 struct compat_ifmap ifru_map; 346 char ifru_slave[IFNAMSIZ]; /* Just fits the size */ 347 char ifru_newname[IFNAMSIZ]; 348 compat_caddr_t ifru_data; 349 struct compat_if_settings ifru_settings; 350 } ifr_ifru; 351 }; 352 353 struct compat_ifconf { 354 compat_int_t ifc_len; /* size of buffer */ 355 compat_caddr_t ifcbuf; 356 }; 357 358 struct compat_robust_list { 359 compat_uptr_t next; 360 }; 361 362 struct compat_robust_list_head { 363 struct compat_robust_list list; 364 compat_long_t futex_offset; 365 compat_uptr_t list_op_pending; 366 }; 367 368 #ifdef CONFIG_COMPAT_OLD_SIGACTION 369 struct compat_old_sigaction { 370 compat_uptr_t sa_handler; 371 compat_old_sigset_t sa_mask; 372 compat_ulong_t sa_flags; 373 compat_uptr_t sa_restorer; 374 }; 375 #endif 376 377 struct compat_keyctl_kdf_params { 378 compat_uptr_t hashname; 379 compat_uptr_t otherinfo; 380 __u32 otherinfolen; 381 __u32 __spare[8]; 382 }; 383 384 struct compat_stat; 385 struct compat_statfs; 386 struct compat_statfs64; 387 struct compat_old_linux_dirent; 388 struct compat_linux_dirent; 389 struct linux_dirent64; 390 struct compat_msghdr; 391 struct compat_mmsghdr; 392 struct compat_sysinfo; 393 struct compat_sysctl_args; 394 struct compat_kexec_segment; 395 struct compat_mq_attr; 396 struct compat_msgbuf; 397 398 void copy_siginfo_to_external32(struct compat_siginfo *to, 399 const struct kernel_siginfo *from); 400 int copy_siginfo_from_user32(kernel_siginfo_t *to, 401 const struct compat_siginfo __user *from); 402 int __copy_siginfo_to_user32(struct compat_siginfo __user *to, 403 const kernel_siginfo_t *from); 404 #ifndef copy_siginfo_to_user32 405 #define copy_siginfo_to_user32 __copy_siginfo_to_user32 406 #endif 407 int get_compat_sigevent(struct sigevent *event, 408 const struct compat_sigevent __user *u_event); 409 410 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat); 411 412 /* 413 * Defined inline such that size can be compile time constant, which avoids 414 * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct 415 */ 416 static inline int 417 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set, 418 unsigned int size) 419 { 420 /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */ 421 #if defined(__BIG_ENDIAN) && defined(CONFIG_64BIT) 422 compat_sigset_t v; 423 switch (_NSIG_WORDS) { 424 case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3]; 425 fallthrough; 426 case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2]; 427 fallthrough; 428 case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1]; 429 fallthrough; 430 case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0]; 431 } 432 return copy_to_user(compat, &v, size) ? -EFAULT : 0; 433 #else 434 return copy_to_user(compat, set, size) ? -EFAULT : 0; 435 #endif 436 } 437 438 #ifdef CONFIG_CPU_BIG_ENDIAN 439 #define unsafe_put_compat_sigset(compat, set, label) do { \ 440 compat_sigset_t __user *__c = compat; \ 441 const sigset_t *__s = set; \ 442 \ 443 switch (_NSIG_WORDS) { \ 444 case 4: \ 445 unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label); \ 446 unsafe_put_user(__s->sig[3], &__c->sig[6], label); \ 447 fallthrough; \ 448 case 3: \ 449 unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label); \ 450 unsafe_put_user(__s->sig[2], &__c->sig[4], label); \ 451 fallthrough; \ 452 case 2: \ 453 unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label); \ 454 unsafe_put_user(__s->sig[1], &__c->sig[2], label); \ 455 fallthrough; \ 456 case 1: \ 457 unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label); \ 458 unsafe_put_user(__s->sig[0], &__c->sig[0], label); \ 459 } \ 460 } while (0) 461 462 #define unsafe_get_compat_sigset(set, compat, label) do { \ 463 const compat_sigset_t __user *__c = compat; \ 464 compat_sigset_word hi, lo; \ 465 sigset_t *__s = set; \ 466 \ 467 switch (_NSIG_WORDS) { \ 468 case 4: \ 469 unsafe_get_user(lo, &__c->sig[7], label); \ 470 unsafe_get_user(hi, &__c->sig[6], label); \ 471 __s->sig[3] = hi | (((long)lo) << 32); \ 472 fallthrough; \ 473 case 3: \ 474 unsafe_get_user(lo, &__c->sig[5], label); \ 475 unsafe_get_user(hi, &__c->sig[4], label); \ 476 __s->sig[2] = hi | (((long)lo) << 32); \ 477 fallthrough; \ 478 case 2: \ 479 unsafe_get_user(lo, &__c->sig[3], label); \ 480 unsafe_get_user(hi, &__c->sig[2], label); \ 481 __s->sig[1] = hi | (((long)lo) << 32); \ 482 fallthrough; \ 483 case 1: \ 484 unsafe_get_user(lo, &__c->sig[1], label); \ 485 unsafe_get_user(hi, &__c->sig[0], label); \ 486 __s->sig[0] = hi | (((long)lo) << 32); \ 487 } \ 488 } while (0) 489 #else 490 #define unsafe_put_compat_sigset(compat, set, label) do { \ 491 compat_sigset_t __user *__c = compat; \ 492 const sigset_t *__s = set; \ 493 \ 494 unsafe_copy_to_user(__c, __s, sizeof(*__c), label); \ 495 } while (0) 496 497 #define unsafe_get_compat_sigset(set, compat, label) do { \ 498 const compat_sigset_t __user *__c = compat; \ 499 sigset_t *__s = set; \ 500 \ 501 unsafe_copy_from_user(__s, __c, sizeof(*__c), label); \ 502 } while (0) 503 #endif 504 505 extern int compat_ptrace_request(struct task_struct *child, 506 compat_long_t request, 507 compat_ulong_t addr, compat_ulong_t data); 508 509 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request, 510 compat_ulong_t addr, compat_ulong_t data); 511 512 struct epoll_event; /* fortunately, this one is fixed-layout */ 513 514 extern void __user *compat_alloc_user_space(unsigned long len); 515 516 int compat_restore_altstack(const compat_stack_t __user *uss); 517 int __compat_save_altstack(compat_stack_t __user *, unsigned long); 518 #define unsafe_compat_save_altstack(uss, sp, label) do { \ 519 compat_stack_t __user *__uss = uss; \ 520 struct task_struct *t = current; \ 521 unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \ 522 &__uss->ss_sp, label); \ 523 unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \ 524 unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \ 525 } while (0); 526 527 /* 528 * These syscall function prototypes are kept in the same order as 529 * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls 530 * go below. 531 * 532 * Please note that these prototypes here are only provided for information 533 * purposes, for static analysis, and for linking from the syscall table. 534 * These functions should not be called elsewhere from kernel code. 535 * 536 * As the syscall calling convention may be different from the default 537 * for architectures overriding the syscall calling convention, do not 538 * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled. 539 */ 540 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER 541 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p); 542 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr, 543 u32 __user *iocb); 544 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id, 545 compat_long_t min_nr, 546 compat_long_t nr, 547 struct io_event __user *events, 548 struct old_timespec32 __user *timeout, 549 const struct __compat_aio_sigset __user *usig); 550 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id, 551 compat_long_t min_nr, 552 compat_long_t nr, 553 struct io_event __user *events, 554 struct __kernel_timespec __user *timeout, 555 const struct __compat_aio_sigset __user *usig); 556 557 /* fs/cookies.c */ 558 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t); 559 560 /* fs/eventpoll.c */ 561 asmlinkage long compat_sys_epoll_pwait(int epfd, 562 struct epoll_event __user *events, 563 int maxevents, int timeout, 564 const compat_sigset_t __user *sigmask, 565 compat_size_t sigsetsize); 566 asmlinkage long compat_sys_epoll_pwait2(int epfd, 567 struct epoll_event __user *events, 568 int maxevents, 569 const struct __kernel_timespec __user *timeout, 570 const compat_sigset_t __user *sigmask, 571 compat_size_t sigsetsize); 572 573 /* fs/fcntl.c */ 574 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd, 575 compat_ulong_t arg); 576 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd, 577 compat_ulong_t arg); 578 579 /* fs/ioctl.c */ 580 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd, 581 compat_ulong_t arg); 582 583 /* fs/open.c */ 584 asmlinkage long compat_sys_statfs(const char __user *pathname, 585 struct compat_statfs __user *buf); 586 asmlinkage long compat_sys_statfs64(const char __user *pathname, 587 compat_size_t sz, 588 struct compat_statfs64 __user *buf); 589 asmlinkage long compat_sys_fstatfs(unsigned int fd, 590 struct compat_statfs __user *buf); 591 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, 592 struct compat_statfs64 __user *buf); 593 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t); 594 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t); 595 /* No generic prototype for truncate64, ftruncate64, fallocate */ 596 asmlinkage long compat_sys_openat(int dfd, const char __user *filename, 597 int flags, umode_t mode); 598 599 /* fs/readdir.c */ 600 asmlinkage long compat_sys_getdents(unsigned int fd, 601 struct compat_linux_dirent __user *dirent, 602 unsigned int count); 603 604 /* fs/read_write.c */ 605 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int); 606 /* No generic prototype for pread64 and pwrite64 */ 607 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd, 608 const struct iovec __user *vec, 609 compat_ulong_t vlen, u32 pos_low, u32 pos_high); 610 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd, 611 const struct iovec __user *vec, 612 compat_ulong_t vlen, u32 pos_low, u32 pos_high); 613 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 614 asmlinkage long compat_sys_preadv64(unsigned long fd, 615 const struct iovec __user *vec, 616 unsigned long vlen, loff_t pos); 617 #endif 618 619 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64 620 asmlinkage long compat_sys_pwritev64(unsigned long fd, 621 const struct iovec __user *vec, 622 unsigned long vlen, loff_t pos); 623 #endif 624 625 /* fs/sendfile.c */ 626 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd, 627 compat_off_t __user *offset, compat_size_t count); 628 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd, 629 compat_loff_t __user *offset, compat_size_t count); 630 631 /* fs/select.c */ 632 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp, 633 compat_ulong_t __user *outp, 634 compat_ulong_t __user *exp, 635 struct old_timespec32 __user *tsp, 636 void __user *sig); 637 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp, 638 compat_ulong_t __user *outp, 639 compat_ulong_t __user *exp, 640 struct __kernel_timespec __user *tsp, 641 void __user *sig); 642 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds, 643 unsigned int nfds, 644 struct old_timespec32 __user *tsp, 645 const compat_sigset_t __user *sigmask, 646 compat_size_t sigsetsize); 647 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds, 648 unsigned int nfds, 649 struct __kernel_timespec __user *tsp, 650 const compat_sigset_t __user *sigmask, 651 compat_size_t sigsetsize); 652 653 /* fs/signalfd.c */ 654 asmlinkage long compat_sys_signalfd4(int ufd, 655 const compat_sigset_t __user *sigmask, 656 compat_size_t sigsetsize, int flags); 657 658 /* fs/stat.c */ 659 asmlinkage long compat_sys_newfstatat(unsigned int dfd, 660 const char __user *filename, 661 struct compat_stat __user *statbuf, 662 int flag); 663 asmlinkage long compat_sys_newfstat(unsigned int fd, 664 struct compat_stat __user *statbuf); 665 666 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */ 667 668 /* kernel/exit.c */ 669 asmlinkage long compat_sys_waitid(int, compat_pid_t, 670 struct compat_siginfo __user *, int, 671 struct compat_rusage __user *); 672 673 674 675 /* kernel/futex.c */ 676 asmlinkage long 677 compat_sys_set_robust_list(struct compat_robust_list_head __user *head, 678 compat_size_t len); 679 asmlinkage long 680 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr, 681 compat_size_t __user *len_ptr); 682 683 /* kernel/itimer.c */ 684 asmlinkage long compat_sys_getitimer(int which, 685 struct old_itimerval32 __user *it); 686 asmlinkage long compat_sys_setitimer(int which, 687 struct old_itimerval32 __user *in, 688 struct old_itimerval32 __user *out); 689 690 /* kernel/kexec.c */ 691 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry, 692 compat_ulong_t nr_segments, 693 struct compat_kexec_segment __user *, 694 compat_ulong_t flags); 695 696 /* kernel/posix-timers.c */ 697 asmlinkage long compat_sys_timer_create(clockid_t which_clock, 698 struct compat_sigevent __user *timer_event_spec, 699 timer_t __user *created_timer_id); 700 701 /* kernel/ptrace.c */ 702 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid, 703 compat_long_t addr, compat_long_t data); 704 705 /* kernel/sched/core.c */ 706 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 707 unsigned int len, 708 compat_ulong_t __user *user_mask_ptr); 709 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, 710 unsigned int len, 711 compat_ulong_t __user *user_mask_ptr); 712 713 /* kernel/signal.c */ 714 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr, 715 compat_stack_t __user *uoss_ptr); 716 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, 717 compat_size_t sigsetsize); 718 #ifndef CONFIG_ODD_RT_SIGACTION 719 asmlinkage long compat_sys_rt_sigaction(int, 720 const struct compat_sigaction __user *, 721 struct compat_sigaction __user *, 722 compat_size_t); 723 #endif 724 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set, 725 compat_sigset_t __user *oset, 726 compat_size_t sigsetsize); 727 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset, 728 compat_size_t sigsetsize); 729 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese, 730 struct compat_siginfo __user *uinfo, 731 struct old_timespec32 __user *uts, compat_size_t sigsetsize); 732 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese, 733 struct compat_siginfo __user *uinfo, 734 struct __kernel_timespec __user *uts, compat_size_t sigsetsize); 735 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig, 736 struct compat_siginfo __user *uinfo); 737 /* No generic prototype for rt_sigreturn */ 738 739 /* kernel/sys.c */ 740 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf); 741 asmlinkage long compat_sys_getrlimit(unsigned int resource, 742 struct compat_rlimit __user *rlim); 743 asmlinkage long compat_sys_setrlimit(unsigned int resource, 744 struct compat_rlimit __user *rlim); 745 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru); 746 747 /* kernel/time.c */ 748 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv, 749 struct timezone __user *tz); 750 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv, 751 struct timezone __user *tz); 752 753 /* kernel/timer.c */ 754 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info); 755 756 /* ipc/mqueue.c */ 757 asmlinkage long compat_sys_mq_open(const char __user *u_name, 758 int oflag, compat_mode_t mode, 759 struct compat_mq_attr __user *u_attr); 760 asmlinkage long compat_sys_mq_notify(mqd_t mqdes, 761 const struct compat_sigevent __user *u_notification); 762 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes, 763 const struct compat_mq_attr __user *u_mqstat, 764 struct compat_mq_attr __user *u_omqstat); 765 766 /* ipc/msg.c */ 767 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr); 768 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp, 769 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg); 770 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp, 771 compat_ssize_t msgsz, int msgflg); 772 773 /* ipc/sem.c */ 774 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg); 775 776 /* ipc/shm.c */ 777 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr); 778 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg); 779 780 /* net/socket.c */ 781 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len, 782 unsigned flags, struct sockaddr __user *addr, 783 int __user *addrlen); 784 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, 785 unsigned flags); 786 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, 787 unsigned int flags); 788 789 /* mm/filemap.c: No generic prototype for readahead */ 790 791 /* security/keys/keyctl.c */ 792 asmlinkage long compat_sys_keyctl(u32 option, 793 u32 arg2, u32 arg3, u32 arg4, u32 arg5); 794 795 /* arch/example/kernel/sys_example.c */ 796 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv, 797 const compat_uptr_t __user *envp); 798 799 /* mm/fadvise.c: No generic prototype for fadvise64_64 */ 800 801 /* mm/, CONFIG_MMU only */ 802 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len, 803 compat_ulong_t mode, 804 compat_ulong_t __user *nmask, 805 compat_ulong_t maxnode, compat_ulong_t flags); 806 asmlinkage long compat_sys_get_mempolicy(int __user *policy, 807 compat_ulong_t __user *nmask, 808 compat_ulong_t maxnode, 809 compat_ulong_t addr, 810 compat_ulong_t flags); 811 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask, 812 compat_ulong_t maxnode); 813 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 814 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes, 815 const compat_ulong_t __user *new_nodes); 816 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages, 817 __u32 __user *pages, 818 const int __user *nodes, 819 int __user *status, 820 int flags); 821 822 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, 823 compat_pid_t pid, int sig, 824 struct compat_siginfo __user *uinfo); 825 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg, 826 unsigned vlen, unsigned int flags, 827 struct __kernel_timespec __user *timeout); 828 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg, 829 unsigned vlen, unsigned int flags, 830 struct old_timespec32 __user *timeout); 831 asmlinkage long compat_sys_wait4(compat_pid_t pid, 832 compat_uint_t __user *stat_addr, int options, 833 struct compat_rusage __user *ru); 834 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32, 835 int, const char __user *); 836 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd, 837 struct file_handle __user *handle, 838 int flags); 839 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg, 840 unsigned vlen, unsigned int flags); 841 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename, 842 const compat_uptr_t __user *argv, 843 const compat_uptr_t __user *envp, int flags); 844 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd, 845 const struct iovec __user *vec, 846 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags); 847 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd, 848 const struct iovec __user *vec, 849 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags); 850 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2 851 asmlinkage long compat_sys_preadv64v2(unsigned long fd, 852 const struct iovec __user *vec, 853 unsigned long vlen, loff_t pos, rwf_t flags); 854 #endif 855 856 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2 857 asmlinkage long compat_sys_pwritev64v2(unsigned long fd, 858 const struct iovec __user *vec, 859 unsigned long vlen, loff_t pos, rwf_t flags); 860 #endif 861 862 863 /* 864 * Deprecated system calls which are still defined in 865 * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch 866 */ 867 868 /* __ARCH_WANT_SYSCALL_NO_AT */ 869 asmlinkage long compat_sys_open(const char __user *filename, int flags, 870 umode_t mode); 871 872 /* __ARCH_WANT_SYSCALL_NO_FLAGS */ 873 asmlinkage long compat_sys_signalfd(int ufd, 874 const compat_sigset_t __user *sigmask, 875 compat_size_t sigsetsize); 876 877 /* __ARCH_WANT_SYSCALL_OFF_T */ 878 asmlinkage long compat_sys_newstat(const char __user *filename, 879 struct compat_stat __user *statbuf); 880 asmlinkage long compat_sys_newlstat(const char __user *filename, 881 struct compat_stat __user *statbuf); 882 883 /* __ARCH_WANT_SYSCALL_DEPRECATED */ 884 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp, 885 compat_ulong_t __user *outp, compat_ulong_t __user *exp, 886 struct old_timeval32 __user *tvp); 887 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32); 888 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len, 889 unsigned flags); 890 891 /* obsolete: fs/readdir.c */ 892 asmlinkage long compat_sys_old_readdir(unsigned int fd, 893 struct compat_old_linux_dirent __user *, 894 unsigned int count); 895 896 /* obsolete: fs/select.c */ 897 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg); 898 899 /* obsolete: ipc */ 900 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32); 901 902 /* obsolete: kernel/signal.c */ 903 #ifdef __ARCH_WANT_SYS_SIGPENDING 904 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set); 905 #endif 906 907 #ifdef __ARCH_WANT_SYS_SIGPROCMASK 908 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset, 909 compat_old_sigset_t __user *oset); 910 #endif 911 #ifdef CONFIG_COMPAT_OLD_SIGACTION 912 asmlinkage long compat_sys_sigaction(int sig, 913 const struct compat_old_sigaction __user *act, 914 struct compat_old_sigaction __user *oact); 915 #endif 916 917 /* obsolete: net/socket.c */ 918 asmlinkage long compat_sys_socketcall(int call, u32 __user *args); 919 920 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */ 921 922 /** 923 * ns_to_old_timeval32 - Compat version of ns_to_timeval 924 * @nsec: the nanoseconds value to be converted 925 * 926 * Returns the old_timeval32 representation of the nsec parameter. 927 */ 928 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec) 929 { 930 struct __kernel_old_timeval tv; 931 struct old_timeval32 ctv; 932 933 tv = ns_to_kernel_old_timeval(nsec); 934 ctv.tv_sec = tv.tv_sec; 935 ctv.tv_usec = tv.tv_usec; 936 937 return ctv; 938 } 939 940 /* 941 * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz()) 942 * directly. Instead, use one of the functions which work equivalently, such 943 * as the kcompat_sys_xyzyyz() functions prototyped below. 944 */ 945 946 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz, 947 struct compat_statfs64 __user * buf); 948 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz, 949 struct compat_statfs64 __user * buf); 950 951 #ifdef CONFIG_COMPAT 952 953 /* 954 * For most but not all architectures, "am I in a compat syscall?" and 955 * "am I a compat task?" are the same question. For architectures on which 956 * they aren't the same question, arch code can override in_compat_syscall. 957 */ 958 #ifndef in_compat_syscall 959 static inline bool in_compat_syscall(void) { return is_compat_task(); } 960 #endif 961 962 #else /* !CONFIG_COMPAT */ 963 964 #define is_compat_task() (0) 965 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */ 966 #define in_compat_syscall in_compat_syscall 967 static inline bool in_compat_syscall(void) { return false; } 968 969 #endif /* CONFIG_COMPAT */ 970 971 #define BITS_PER_COMPAT_LONG (8*sizeof(compat_long_t)) 972 973 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG) 974 975 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 976 unsigned long bitmap_size); 977 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 978 unsigned long bitmap_size); 979 980 /* 981 * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit 982 * types, and will need special compat treatment for that. Most architectures 983 * don't need that special handling even for compat syscalls. 984 */ 985 #ifndef compat_need_64bit_alignment_fixup 986 #define compat_need_64bit_alignment_fixup() false 987 #endif 988 989 /* 990 * A pointer passed in from user mode. This should not 991 * be used for syscall parameters, just declare them 992 * as pointers because the syscall entry code will have 993 * appropriately converted them already. 994 */ 995 #ifndef compat_ptr 996 static inline void __user *compat_ptr(compat_uptr_t uptr) 997 { 998 return (void __user *)(unsigned long)uptr; 999 } 1000 #endif 1001 1002 static inline compat_uptr_t ptr_to_compat(void __user *uptr) 1003 { 1004 return (u32)(unsigned long)uptr; 1005 } 1006 1007 #endif /* _LINUX_COMPAT_H */ 1008