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 #ifdef __ARCH_NEED_COMPAT_FLOCK64_PACKED 262 #define __ARCH_COMPAT_FLOCK64_PACK __attribute__((packed)) 263 #else 264 #define __ARCH_COMPAT_FLOCK64_PACK 265 #endif 266 267 struct compat_flock { 268 short l_type; 269 short l_whence; 270 compat_off_t l_start; 271 compat_off_t l_len; 272 #ifdef __ARCH_COMPAT_FLOCK_EXTRA_SYSID 273 __ARCH_COMPAT_FLOCK_EXTRA_SYSID 274 #endif 275 compat_pid_t l_pid; 276 #ifdef __ARCH_COMPAT_FLOCK_PAD 277 __ARCH_COMPAT_FLOCK_PAD 278 #endif 279 }; 280 281 struct compat_flock64 { 282 short l_type; 283 short l_whence; 284 compat_loff_t l_start; 285 compat_loff_t l_len; 286 compat_pid_t l_pid; 287 #ifdef __ARCH_COMPAT_FLOCK64_PAD 288 __ARCH_COMPAT_FLOCK64_PAD 289 #endif 290 } __ARCH_COMPAT_FLOCK64_PACK; 291 292 struct compat_rusage { 293 struct old_timeval32 ru_utime; 294 struct old_timeval32 ru_stime; 295 compat_long_t ru_maxrss; 296 compat_long_t ru_ixrss; 297 compat_long_t ru_idrss; 298 compat_long_t ru_isrss; 299 compat_long_t ru_minflt; 300 compat_long_t ru_majflt; 301 compat_long_t ru_nswap; 302 compat_long_t ru_inblock; 303 compat_long_t ru_oublock; 304 compat_long_t ru_msgsnd; 305 compat_long_t ru_msgrcv; 306 compat_long_t ru_nsignals; 307 compat_long_t ru_nvcsw; 308 compat_long_t ru_nivcsw; 309 }; 310 311 extern int put_compat_rusage(const struct rusage *, 312 struct compat_rusage __user *); 313 314 struct compat_siginfo; 315 struct __compat_aio_sigset; 316 317 struct compat_dirent { 318 u32 d_ino; 319 compat_off_t d_off; 320 u16 d_reclen; 321 char d_name[256]; 322 }; 323 324 struct compat_ustat { 325 compat_daddr_t f_tfree; 326 compat_ino_t f_tinode; 327 char f_fname[6]; 328 char f_fpack[6]; 329 }; 330 331 #define COMPAT_SIGEV_PAD_SIZE ((SIGEV_MAX_SIZE/sizeof(int)) - 3) 332 333 typedef struct compat_sigevent { 334 compat_sigval_t sigev_value; 335 compat_int_t sigev_signo; 336 compat_int_t sigev_notify; 337 union { 338 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE]; 339 compat_int_t _tid; 340 341 struct { 342 compat_uptr_t _function; 343 compat_uptr_t _attribute; 344 } _sigev_thread; 345 } _sigev_un; 346 } compat_sigevent_t; 347 348 struct compat_ifmap { 349 compat_ulong_t mem_start; 350 compat_ulong_t mem_end; 351 unsigned short base_addr; 352 unsigned char irq; 353 unsigned char dma; 354 unsigned char port; 355 }; 356 357 struct compat_if_settings { 358 unsigned int type; /* Type of physical device or protocol */ 359 unsigned int size; /* Size of the data allocated by the caller */ 360 compat_uptr_t ifs_ifsu; /* union of pointers */ 361 }; 362 363 struct compat_ifreq { 364 union { 365 char ifrn_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 366 } ifr_ifrn; 367 union { 368 struct sockaddr ifru_addr; 369 struct sockaddr ifru_dstaddr; 370 struct sockaddr ifru_broadaddr; 371 struct sockaddr ifru_netmask; 372 struct sockaddr ifru_hwaddr; 373 short ifru_flags; 374 compat_int_t ifru_ivalue; 375 compat_int_t ifru_mtu; 376 struct compat_ifmap ifru_map; 377 char ifru_slave[IFNAMSIZ]; /* Just fits the size */ 378 char ifru_newname[IFNAMSIZ]; 379 compat_caddr_t ifru_data; 380 struct compat_if_settings ifru_settings; 381 } ifr_ifru; 382 }; 383 384 struct compat_ifconf { 385 compat_int_t ifc_len; /* size of buffer */ 386 compat_caddr_t ifcbuf; 387 }; 388 389 struct compat_robust_list { 390 compat_uptr_t next; 391 }; 392 393 struct compat_robust_list_head { 394 struct compat_robust_list list; 395 compat_long_t futex_offset; 396 compat_uptr_t list_op_pending; 397 }; 398 399 #ifdef CONFIG_COMPAT_OLD_SIGACTION 400 struct compat_old_sigaction { 401 compat_uptr_t sa_handler; 402 compat_old_sigset_t sa_mask; 403 compat_ulong_t sa_flags; 404 compat_uptr_t sa_restorer; 405 }; 406 #endif 407 408 struct compat_keyctl_kdf_params { 409 compat_uptr_t hashname; 410 compat_uptr_t otherinfo; 411 __u32 otherinfolen; 412 __u32 __spare[8]; 413 }; 414 415 struct compat_stat; 416 struct compat_statfs; 417 struct compat_statfs64; 418 struct compat_old_linux_dirent; 419 struct compat_linux_dirent; 420 struct linux_dirent64; 421 struct compat_msghdr; 422 struct compat_mmsghdr; 423 struct compat_sysinfo; 424 struct compat_sysctl_args; 425 struct compat_kexec_segment; 426 struct compat_mq_attr; 427 struct compat_msgbuf; 428 429 void copy_siginfo_to_external32(struct compat_siginfo *to, 430 const struct kernel_siginfo *from); 431 int copy_siginfo_from_user32(kernel_siginfo_t *to, 432 const struct compat_siginfo __user *from); 433 int __copy_siginfo_to_user32(struct compat_siginfo __user *to, 434 const kernel_siginfo_t *from); 435 #ifndef copy_siginfo_to_user32 436 #define copy_siginfo_to_user32 __copy_siginfo_to_user32 437 #endif 438 int get_compat_sigevent(struct sigevent *event, 439 const struct compat_sigevent __user *u_event); 440 441 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat); 442 443 /* 444 * Defined inline such that size can be compile time constant, which avoids 445 * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct 446 */ 447 static inline int 448 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set, 449 unsigned int size) 450 { 451 /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */ 452 #if defined(__BIG_ENDIAN) && defined(CONFIG_64BIT) 453 compat_sigset_t v; 454 switch (_NSIG_WORDS) { 455 case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3]; 456 fallthrough; 457 case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2]; 458 fallthrough; 459 case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1]; 460 fallthrough; 461 case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0]; 462 } 463 return copy_to_user(compat, &v, size) ? -EFAULT : 0; 464 #else 465 return copy_to_user(compat, set, size) ? -EFAULT : 0; 466 #endif 467 } 468 469 #ifdef CONFIG_CPU_BIG_ENDIAN 470 #define unsafe_put_compat_sigset(compat, set, label) do { \ 471 compat_sigset_t __user *__c = compat; \ 472 const sigset_t *__s = set; \ 473 \ 474 switch (_NSIG_WORDS) { \ 475 case 4: \ 476 unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label); \ 477 unsafe_put_user(__s->sig[3], &__c->sig[6], label); \ 478 fallthrough; \ 479 case 3: \ 480 unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label); \ 481 unsafe_put_user(__s->sig[2], &__c->sig[4], label); \ 482 fallthrough; \ 483 case 2: \ 484 unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label); \ 485 unsafe_put_user(__s->sig[1], &__c->sig[2], label); \ 486 fallthrough; \ 487 case 1: \ 488 unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label); \ 489 unsafe_put_user(__s->sig[0], &__c->sig[0], label); \ 490 } \ 491 } while (0) 492 493 #define unsafe_get_compat_sigset(set, compat, label) do { \ 494 const compat_sigset_t __user *__c = compat; \ 495 compat_sigset_word hi, lo; \ 496 sigset_t *__s = set; \ 497 \ 498 switch (_NSIG_WORDS) { \ 499 case 4: \ 500 unsafe_get_user(lo, &__c->sig[7], label); \ 501 unsafe_get_user(hi, &__c->sig[6], label); \ 502 __s->sig[3] = hi | (((long)lo) << 32); \ 503 fallthrough; \ 504 case 3: \ 505 unsafe_get_user(lo, &__c->sig[5], label); \ 506 unsafe_get_user(hi, &__c->sig[4], label); \ 507 __s->sig[2] = hi | (((long)lo) << 32); \ 508 fallthrough; \ 509 case 2: \ 510 unsafe_get_user(lo, &__c->sig[3], label); \ 511 unsafe_get_user(hi, &__c->sig[2], label); \ 512 __s->sig[1] = hi | (((long)lo) << 32); \ 513 fallthrough; \ 514 case 1: \ 515 unsafe_get_user(lo, &__c->sig[1], label); \ 516 unsafe_get_user(hi, &__c->sig[0], label); \ 517 __s->sig[0] = hi | (((long)lo) << 32); \ 518 } \ 519 } while (0) 520 #else 521 #define unsafe_put_compat_sigset(compat, set, label) do { \ 522 compat_sigset_t __user *__c = compat; \ 523 const sigset_t *__s = set; \ 524 \ 525 unsafe_copy_to_user(__c, __s, sizeof(*__c), label); \ 526 } while (0) 527 528 #define unsafe_get_compat_sigset(set, compat, label) do { \ 529 const compat_sigset_t __user *__c = compat; \ 530 sigset_t *__s = set; \ 531 \ 532 unsafe_copy_from_user(__s, __c, sizeof(*__c), label); \ 533 } while (0) 534 #endif 535 536 extern int compat_ptrace_request(struct task_struct *child, 537 compat_long_t request, 538 compat_ulong_t addr, compat_ulong_t data); 539 540 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request, 541 compat_ulong_t addr, compat_ulong_t data); 542 543 struct epoll_event; /* fortunately, this one is fixed-layout */ 544 545 int compat_restore_altstack(const compat_stack_t __user *uss); 546 int __compat_save_altstack(compat_stack_t __user *, unsigned long); 547 #define unsafe_compat_save_altstack(uss, sp, label) do { \ 548 compat_stack_t __user *__uss = uss; \ 549 struct task_struct *t = current; \ 550 unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \ 551 &__uss->ss_sp, label); \ 552 unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \ 553 unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \ 554 } while (0); 555 556 /* 557 * These syscall function prototypes are kept in the same order as 558 * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls 559 * go below. 560 * 561 * Please note that these prototypes here are only provided for information 562 * purposes, for static analysis, and for linking from the syscall table. 563 * These functions should not be called elsewhere from kernel code. 564 * 565 * As the syscall calling convention may be different from the default 566 * for architectures overriding the syscall calling convention, do not 567 * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled. 568 */ 569 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER 570 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p); 571 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr, 572 u32 __user *iocb); 573 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id, 574 compat_long_t min_nr, 575 compat_long_t nr, 576 struct io_event __user *events, 577 struct old_timespec32 __user *timeout, 578 const struct __compat_aio_sigset __user *usig); 579 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id, 580 compat_long_t min_nr, 581 compat_long_t nr, 582 struct io_event __user *events, 583 struct __kernel_timespec __user *timeout, 584 const struct __compat_aio_sigset __user *usig); 585 586 /* fs/cookies.c */ 587 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t); 588 589 /* fs/eventpoll.c */ 590 asmlinkage long compat_sys_epoll_pwait(int epfd, 591 struct epoll_event __user *events, 592 int maxevents, int timeout, 593 const compat_sigset_t __user *sigmask, 594 compat_size_t sigsetsize); 595 asmlinkage long compat_sys_epoll_pwait2(int epfd, 596 struct epoll_event __user *events, 597 int maxevents, 598 const struct __kernel_timespec __user *timeout, 599 const compat_sigset_t __user *sigmask, 600 compat_size_t sigsetsize); 601 602 /* fs/fcntl.c */ 603 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd, 604 compat_ulong_t arg); 605 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd, 606 compat_ulong_t arg); 607 608 /* fs/ioctl.c */ 609 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd, 610 compat_ulong_t arg); 611 612 /* fs/open.c */ 613 asmlinkage long compat_sys_statfs(const char __user *pathname, 614 struct compat_statfs __user *buf); 615 asmlinkage long compat_sys_statfs64(const char __user *pathname, 616 compat_size_t sz, 617 struct compat_statfs64 __user *buf); 618 asmlinkage long compat_sys_fstatfs(unsigned int fd, 619 struct compat_statfs __user *buf); 620 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, 621 struct compat_statfs64 __user *buf); 622 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t); 623 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t); 624 /* No generic prototype for truncate64, ftruncate64, fallocate */ 625 asmlinkage long compat_sys_openat(int dfd, const char __user *filename, 626 int flags, umode_t mode); 627 628 /* fs/readdir.c */ 629 asmlinkage long compat_sys_getdents(unsigned int fd, 630 struct compat_linux_dirent __user *dirent, 631 unsigned int count); 632 633 /* fs/read_write.c */ 634 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int); 635 /* No generic prototype for pread64 and pwrite64 */ 636 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd, 637 const struct iovec __user *vec, 638 compat_ulong_t vlen, u32 pos_low, u32 pos_high); 639 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd, 640 const struct iovec __user *vec, 641 compat_ulong_t vlen, u32 pos_low, u32 pos_high); 642 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 643 asmlinkage long compat_sys_preadv64(unsigned long fd, 644 const struct iovec __user *vec, 645 unsigned long vlen, loff_t pos); 646 #endif 647 648 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64 649 asmlinkage long compat_sys_pwritev64(unsigned long fd, 650 const struct iovec __user *vec, 651 unsigned long vlen, loff_t pos); 652 #endif 653 654 /* fs/sendfile.c */ 655 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd, 656 compat_off_t __user *offset, compat_size_t count); 657 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd, 658 compat_loff_t __user *offset, compat_size_t count); 659 660 /* fs/select.c */ 661 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp, 662 compat_ulong_t __user *outp, 663 compat_ulong_t __user *exp, 664 struct old_timespec32 __user *tsp, 665 void __user *sig); 666 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp, 667 compat_ulong_t __user *outp, 668 compat_ulong_t __user *exp, 669 struct __kernel_timespec __user *tsp, 670 void __user *sig); 671 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds, 672 unsigned int nfds, 673 struct old_timespec32 __user *tsp, 674 const compat_sigset_t __user *sigmask, 675 compat_size_t sigsetsize); 676 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds, 677 unsigned int nfds, 678 struct __kernel_timespec __user *tsp, 679 const compat_sigset_t __user *sigmask, 680 compat_size_t sigsetsize); 681 682 /* fs/signalfd.c */ 683 asmlinkage long compat_sys_signalfd4(int ufd, 684 const compat_sigset_t __user *sigmask, 685 compat_size_t sigsetsize, int flags); 686 687 /* fs/stat.c */ 688 asmlinkage long compat_sys_newfstatat(unsigned int dfd, 689 const char __user *filename, 690 struct compat_stat __user *statbuf, 691 int flag); 692 asmlinkage long compat_sys_newfstat(unsigned int fd, 693 struct compat_stat __user *statbuf); 694 695 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */ 696 697 /* kernel/exit.c */ 698 asmlinkage long compat_sys_waitid(int, compat_pid_t, 699 struct compat_siginfo __user *, int, 700 struct compat_rusage __user *); 701 702 703 704 /* kernel/futex.c */ 705 asmlinkage long 706 compat_sys_set_robust_list(struct compat_robust_list_head __user *head, 707 compat_size_t len); 708 asmlinkage long 709 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr, 710 compat_size_t __user *len_ptr); 711 712 /* kernel/itimer.c */ 713 asmlinkage long compat_sys_getitimer(int which, 714 struct old_itimerval32 __user *it); 715 asmlinkage long compat_sys_setitimer(int which, 716 struct old_itimerval32 __user *in, 717 struct old_itimerval32 __user *out); 718 719 /* kernel/kexec.c */ 720 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry, 721 compat_ulong_t nr_segments, 722 struct compat_kexec_segment __user *, 723 compat_ulong_t flags); 724 725 /* kernel/posix-timers.c */ 726 asmlinkage long compat_sys_timer_create(clockid_t which_clock, 727 struct compat_sigevent __user *timer_event_spec, 728 timer_t __user *created_timer_id); 729 730 /* kernel/ptrace.c */ 731 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid, 732 compat_long_t addr, compat_long_t data); 733 734 /* kernel/sched/core.c */ 735 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 736 unsigned int len, 737 compat_ulong_t __user *user_mask_ptr); 738 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, 739 unsigned int len, 740 compat_ulong_t __user *user_mask_ptr); 741 742 /* kernel/signal.c */ 743 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr, 744 compat_stack_t __user *uoss_ptr); 745 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, 746 compat_size_t sigsetsize); 747 #ifndef CONFIG_ODD_RT_SIGACTION 748 asmlinkage long compat_sys_rt_sigaction(int, 749 const struct compat_sigaction __user *, 750 struct compat_sigaction __user *, 751 compat_size_t); 752 #endif 753 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set, 754 compat_sigset_t __user *oset, 755 compat_size_t sigsetsize); 756 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset, 757 compat_size_t sigsetsize); 758 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese, 759 struct compat_siginfo __user *uinfo, 760 struct old_timespec32 __user *uts, compat_size_t sigsetsize); 761 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese, 762 struct compat_siginfo __user *uinfo, 763 struct __kernel_timespec __user *uts, compat_size_t sigsetsize); 764 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig, 765 struct compat_siginfo __user *uinfo); 766 /* No generic prototype for rt_sigreturn */ 767 768 /* kernel/sys.c */ 769 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf); 770 asmlinkage long compat_sys_getrlimit(unsigned int resource, 771 struct compat_rlimit __user *rlim); 772 asmlinkage long compat_sys_setrlimit(unsigned int resource, 773 struct compat_rlimit __user *rlim); 774 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru); 775 776 /* kernel/time.c */ 777 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv, 778 struct timezone __user *tz); 779 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv, 780 struct timezone __user *tz); 781 782 /* kernel/timer.c */ 783 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info); 784 785 /* ipc/mqueue.c */ 786 asmlinkage long compat_sys_mq_open(const char __user *u_name, 787 int oflag, compat_mode_t mode, 788 struct compat_mq_attr __user *u_attr); 789 asmlinkage long compat_sys_mq_notify(mqd_t mqdes, 790 const struct compat_sigevent __user *u_notification); 791 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes, 792 const struct compat_mq_attr __user *u_mqstat, 793 struct compat_mq_attr __user *u_omqstat); 794 795 /* ipc/msg.c */ 796 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr); 797 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp, 798 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg); 799 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp, 800 compat_ssize_t msgsz, int msgflg); 801 802 /* ipc/sem.c */ 803 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg); 804 805 /* ipc/shm.c */ 806 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr); 807 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg); 808 809 /* net/socket.c */ 810 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len, 811 unsigned flags, struct sockaddr __user *addr, 812 int __user *addrlen); 813 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, 814 unsigned flags); 815 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, 816 unsigned int flags); 817 818 /* mm/filemap.c: No generic prototype for readahead */ 819 820 /* security/keys/keyctl.c */ 821 asmlinkage long compat_sys_keyctl(u32 option, 822 u32 arg2, u32 arg3, u32 arg4, u32 arg5); 823 824 /* arch/example/kernel/sys_example.c */ 825 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv, 826 const compat_uptr_t __user *envp); 827 828 /* mm/fadvise.c: No generic prototype for fadvise64_64 */ 829 830 /* mm/, CONFIG_MMU only */ 831 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, 832 compat_pid_t pid, int sig, 833 struct compat_siginfo __user *uinfo); 834 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg, 835 unsigned vlen, unsigned int flags, 836 struct __kernel_timespec __user *timeout); 837 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg, 838 unsigned vlen, unsigned int flags, 839 struct old_timespec32 __user *timeout); 840 asmlinkage long compat_sys_wait4(compat_pid_t pid, 841 compat_uint_t __user *stat_addr, int options, 842 struct compat_rusage __user *ru); 843 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32, 844 int, const char __user *); 845 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd, 846 struct file_handle __user *handle, 847 int flags); 848 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg, 849 unsigned vlen, unsigned int flags); 850 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename, 851 const compat_uptr_t __user *argv, 852 const compat_uptr_t __user *envp, int flags); 853 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd, 854 const struct iovec __user *vec, 855 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags); 856 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd, 857 const struct iovec __user *vec, 858 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags); 859 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2 860 asmlinkage long compat_sys_preadv64v2(unsigned long fd, 861 const struct iovec __user *vec, 862 unsigned long vlen, loff_t pos, rwf_t flags); 863 #endif 864 865 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2 866 asmlinkage long compat_sys_pwritev64v2(unsigned long fd, 867 const struct iovec __user *vec, 868 unsigned long vlen, loff_t pos, rwf_t flags); 869 #endif 870 871 872 /* 873 * Deprecated system calls which are still defined in 874 * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch 875 */ 876 877 /* __ARCH_WANT_SYSCALL_NO_AT */ 878 asmlinkage long compat_sys_open(const char __user *filename, int flags, 879 umode_t mode); 880 881 /* __ARCH_WANT_SYSCALL_NO_FLAGS */ 882 asmlinkage long compat_sys_signalfd(int ufd, 883 const compat_sigset_t __user *sigmask, 884 compat_size_t sigsetsize); 885 886 /* __ARCH_WANT_SYSCALL_OFF_T */ 887 asmlinkage long compat_sys_newstat(const char __user *filename, 888 struct compat_stat __user *statbuf); 889 asmlinkage long compat_sys_newlstat(const char __user *filename, 890 struct compat_stat __user *statbuf); 891 892 /* __ARCH_WANT_SYSCALL_DEPRECATED */ 893 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp, 894 compat_ulong_t __user *outp, compat_ulong_t __user *exp, 895 struct old_timeval32 __user *tvp); 896 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32); 897 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len, 898 unsigned flags); 899 900 /* obsolete: fs/readdir.c */ 901 asmlinkage long compat_sys_old_readdir(unsigned int fd, 902 struct compat_old_linux_dirent __user *, 903 unsigned int count); 904 905 /* obsolete: fs/select.c */ 906 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg); 907 908 /* obsolete: ipc */ 909 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32); 910 911 /* obsolete: kernel/signal.c */ 912 #ifdef __ARCH_WANT_SYS_SIGPENDING 913 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set); 914 #endif 915 916 #ifdef __ARCH_WANT_SYS_SIGPROCMASK 917 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset, 918 compat_old_sigset_t __user *oset); 919 #endif 920 #ifdef CONFIG_COMPAT_OLD_SIGACTION 921 asmlinkage long compat_sys_sigaction(int sig, 922 const struct compat_old_sigaction __user *act, 923 struct compat_old_sigaction __user *oact); 924 #endif 925 926 /* obsolete: net/socket.c */ 927 asmlinkage long compat_sys_socketcall(int call, u32 __user *args); 928 929 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */ 930 931 /** 932 * ns_to_old_timeval32 - Compat version of ns_to_timeval 933 * @nsec: the nanoseconds value to be converted 934 * 935 * Returns the old_timeval32 representation of the nsec parameter. 936 */ 937 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec) 938 { 939 struct __kernel_old_timeval tv; 940 struct old_timeval32 ctv; 941 942 tv = ns_to_kernel_old_timeval(nsec); 943 ctv.tv_sec = tv.tv_sec; 944 ctv.tv_usec = tv.tv_usec; 945 946 return ctv; 947 } 948 949 /* 950 * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz()) 951 * directly. Instead, use one of the functions which work equivalently, such 952 * as the kcompat_sys_xyzyyz() functions prototyped below. 953 */ 954 955 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz, 956 struct compat_statfs64 __user * buf); 957 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz, 958 struct compat_statfs64 __user * buf); 959 960 #ifdef CONFIG_COMPAT 961 962 /* 963 * For most but not all architectures, "am I in a compat syscall?" and 964 * "am I a compat task?" are the same question. For architectures on which 965 * they aren't the same question, arch code can override in_compat_syscall. 966 */ 967 #ifndef in_compat_syscall 968 static inline bool in_compat_syscall(void) { return is_compat_task(); } 969 #endif 970 971 #else /* !CONFIG_COMPAT */ 972 973 #define is_compat_task() (0) 974 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */ 975 #define in_compat_syscall in_compat_syscall 976 static inline bool in_compat_syscall(void) { return false; } 977 978 #endif /* CONFIG_COMPAT */ 979 980 #define BITS_PER_COMPAT_LONG (8*sizeof(compat_long_t)) 981 982 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG) 983 984 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 985 unsigned long bitmap_size); 986 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 987 unsigned long bitmap_size); 988 989 /* 990 * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit 991 * types, and will need special compat treatment for that. Most architectures 992 * don't need that special handling even for compat syscalls. 993 */ 994 #ifndef compat_need_64bit_alignment_fixup 995 #define compat_need_64bit_alignment_fixup() false 996 #endif 997 998 /* 999 * A pointer passed in from user mode. This should not 1000 * be used for syscall parameters, just declare them 1001 * as pointers because the syscall entry code will have 1002 * appropriately converted them already. 1003 */ 1004 #ifndef compat_ptr 1005 static inline void __user *compat_ptr(compat_uptr_t uptr) 1006 { 1007 return (void __user *)(unsigned long)uptr; 1008 } 1009 #endif 1010 1011 static inline compat_uptr_t ptr_to_compat(void __user *uptr) 1012 { 1013 return (u32)(unsigned long)uptr; 1014 } 1015 1016 #endif /* _LINUX_COMPAT_H */ 1017