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
put_compat_sigset(compat_sigset_t __user * compat,const sigset_t * set,unsigned int size)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 int compat_restore_altstack(const compat_stack_t __user *uss);
515 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
516 #define unsafe_compat_save_altstack(uss, sp, label) do { \
517 compat_stack_t __user *__uss = uss; \
518 struct task_struct *t = current; \
519 unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
520 &__uss->ss_sp, label); \
521 unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
522 unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
523 } while (0);
524
525 /*
526 * These syscall function prototypes are kept in the same order as
527 * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
528 * go below.
529 *
530 * Please note that these prototypes here are only provided for information
531 * purposes, for static analysis, and for linking from the syscall table.
532 * These functions should not be called elsewhere from kernel code.
533 *
534 * As the syscall calling convention may be different from the default
535 * for architectures overriding the syscall calling convention, do not
536 * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
537 */
538 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
539 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
540 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
541 u32 __user *iocb);
542 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
543 compat_long_t min_nr,
544 compat_long_t nr,
545 struct io_event __user *events,
546 struct old_timespec32 __user *timeout,
547 const struct __compat_aio_sigset __user *usig);
548 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
549 compat_long_t min_nr,
550 compat_long_t nr,
551 struct io_event __user *events,
552 struct __kernel_timespec __user *timeout,
553 const struct __compat_aio_sigset __user *usig);
554
555 /* fs/cookies.c */
556 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
557
558 /* fs/eventpoll.c */
559 asmlinkage long compat_sys_epoll_pwait(int epfd,
560 struct epoll_event __user *events,
561 int maxevents, int timeout,
562 const compat_sigset_t __user *sigmask,
563 compat_size_t sigsetsize);
564 asmlinkage long compat_sys_epoll_pwait2(int epfd,
565 struct epoll_event __user *events,
566 int maxevents,
567 const struct __kernel_timespec __user *timeout,
568 const compat_sigset_t __user *sigmask,
569 compat_size_t sigsetsize);
570
571 /* fs/fcntl.c */
572 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
573 compat_ulong_t arg);
574 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
575 compat_ulong_t arg);
576
577 /* fs/ioctl.c */
578 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
579 compat_ulong_t arg);
580
581 /* fs/open.c */
582 asmlinkage long compat_sys_statfs(const char __user *pathname,
583 struct compat_statfs __user *buf);
584 asmlinkage long compat_sys_statfs64(const char __user *pathname,
585 compat_size_t sz,
586 struct compat_statfs64 __user *buf);
587 asmlinkage long compat_sys_fstatfs(unsigned int fd,
588 struct compat_statfs __user *buf);
589 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
590 struct compat_statfs64 __user *buf);
591 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
592 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
593 /* No generic prototype for truncate64, ftruncate64, fallocate */
594 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
595 int flags, umode_t mode);
596
597 /* fs/readdir.c */
598 asmlinkage long compat_sys_getdents(unsigned int fd,
599 struct compat_linux_dirent __user *dirent,
600 unsigned int count);
601
602 /* fs/read_write.c */
603 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
604 /* No generic prototype for pread64 and pwrite64 */
605 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
606 const struct iovec __user *vec,
607 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
608 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
609 const struct iovec __user *vec,
610 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
611 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
612 asmlinkage long compat_sys_preadv64(unsigned long fd,
613 const struct iovec __user *vec,
614 unsigned long vlen, loff_t pos);
615 #endif
616
617 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
618 asmlinkage long compat_sys_pwritev64(unsigned long fd,
619 const struct iovec __user *vec,
620 unsigned long vlen, loff_t pos);
621 #endif
622
623 /* fs/sendfile.c */
624 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
625 compat_off_t __user *offset, compat_size_t count);
626 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
627 compat_loff_t __user *offset, compat_size_t count);
628
629 /* fs/select.c */
630 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
631 compat_ulong_t __user *outp,
632 compat_ulong_t __user *exp,
633 struct old_timespec32 __user *tsp,
634 void __user *sig);
635 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
636 compat_ulong_t __user *outp,
637 compat_ulong_t __user *exp,
638 struct __kernel_timespec __user *tsp,
639 void __user *sig);
640 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
641 unsigned int nfds,
642 struct old_timespec32 __user *tsp,
643 const compat_sigset_t __user *sigmask,
644 compat_size_t sigsetsize);
645 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
646 unsigned int nfds,
647 struct __kernel_timespec __user *tsp,
648 const compat_sigset_t __user *sigmask,
649 compat_size_t sigsetsize);
650
651 /* fs/signalfd.c */
652 asmlinkage long compat_sys_signalfd4(int ufd,
653 const compat_sigset_t __user *sigmask,
654 compat_size_t sigsetsize, int flags);
655
656 /* fs/stat.c */
657 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
658 const char __user *filename,
659 struct compat_stat __user *statbuf,
660 int flag);
661 asmlinkage long compat_sys_newfstat(unsigned int fd,
662 struct compat_stat __user *statbuf);
663
664 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
665
666 /* kernel/exit.c */
667 asmlinkage long compat_sys_waitid(int, compat_pid_t,
668 struct compat_siginfo __user *, int,
669 struct compat_rusage __user *);
670
671
672
673 /* kernel/futex.c */
674 asmlinkage long
675 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
676 compat_size_t len);
677 asmlinkage long
678 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
679 compat_size_t __user *len_ptr);
680
681 /* kernel/itimer.c */
682 asmlinkage long compat_sys_getitimer(int which,
683 struct old_itimerval32 __user *it);
684 asmlinkage long compat_sys_setitimer(int which,
685 struct old_itimerval32 __user *in,
686 struct old_itimerval32 __user *out);
687
688 /* kernel/kexec.c */
689 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
690 compat_ulong_t nr_segments,
691 struct compat_kexec_segment __user *,
692 compat_ulong_t flags);
693
694 /* kernel/posix-timers.c */
695 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
696 struct compat_sigevent __user *timer_event_spec,
697 timer_t __user *created_timer_id);
698
699 /* kernel/ptrace.c */
700 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
701 compat_long_t addr, compat_long_t data);
702
703 /* kernel/sched/core.c */
704 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
705 unsigned int len,
706 compat_ulong_t __user *user_mask_ptr);
707 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
708 unsigned int len,
709 compat_ulong_t __user *user_mask_ptr);
710
711 /* kernel/signal.c */
712 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
713 compat_stack_t __user *uoss_ptr);
714 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
715 compat_size_t sigsetsize);
716 #ifndef CONFIG_ODD_RT_SIGACTION
717 asmlinkage long compat_sys_rt_sigaction(int,
718 const struct compat_sigaction __user *,
719 struct compat_sigaction __user *,
720 compat_size_t);
721 #endif
722 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
723 compat_sigset_t __user *oset,
724 compat_size_t sigsetsize);
725 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
726 compat_size_t sigsetsize);
727 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
728 struct compat_siginfo __user *uinfo,
729 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
730 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
731 struct compat_siginfo __user *uinfo,
732 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
733 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
734 struct compat_siginfo __user *uinfo);
735 /* No generic prototype for rt_sigreturn */
736
737 /* kernel/sys.c */
738 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
739 asmlinkage long compat_sys_getrlimit(unsigned int resource,
740 struct compat_rlimit __user *rlim);
741 asmlinkage long compat_sys_setrlimit(unsigned int resource,
742 struct compat_rlimit __user *rlim);
743 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
744
745 /* kernel/time.c */
746 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
747 struct timezone __user *tz);
748 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
749 struct timezone __user *tz);
750
751 /* kernel/timer.c */
752 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
753
754 /* ipc/mqueue.c */
755 asmlinkage long compat_sys_mq_open(const char __user *u_name,
756 int oflag, compat_mode_t mode,
757 struct compat_mq_attr __user *u_attr);
758 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
759 const struct compat_sigevent __user *u_notification);
760 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
761 const struct compat_mq_attr __user *u_mqstat,
762 struct compat_mq_attr __user *u_omqstat);
763
764 /* ipc/msg.c */
765 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
766 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
767 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
768 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
769 compat_ssize_t msgsz, int msgflg);
770
771 /* ipc/sem.c */
772 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
773
774 /* ipc/shm.c */
775 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
776 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
777
778 /* net/socket.c */
779 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
780 unsigned flags, struct sockaddr __user *addr,
781 int __user *addrlen);
782 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
783 unsigned flags);
784 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
785 unsigned int flags);
786
787 /* mm/filemap.c: No generic prototype for readahead */
788
789 /* security/keys/keyctl.c */
790 asmlinkage long compat_sys_keyctl(u32 option,
791 u32 arg2, u32 arg3, u32 arg4, u32 arg5);
792
793 /* arch/example/kernel/sys_example.c */
794 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
795 const compat_uptr_t __user *envp);
796
797 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
798
799 /* mm/, CONFIG_MMU only */
800 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
801 compat_pid_t pid, int sig,
802 struct compat_siginfo __user *uinfo);
803 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
804 unsigned vlen, unsigned int flags,
805 struct __kernel_timespec __user *timeout);
806 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
807 unsigned vlen, unsigned int flags,
808 struct old_timespec32 __user *timeout);
809 asmlinkage long compat_sys_wait4(compat_pid_t pid,
810 compat_uint_t __user *stat_addr, int options,
811 struct compat_rusage __user *ru);
812 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
813 int, const char __user *);
814 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
815 struct file_handle __user *handle,
816 int flags);
817 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
818 unsigned vlen, unsigned int flags);
819 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
820 const compat_uptr_t __user *argv,
821 const compat_uptr_t __user *envp, int flags);
822 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
823 const struct iovec __user *vec,
824 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
825 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
826 const struct iovec __user *vec,
827 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
828 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
829 asmlinkage long compat_sys_preadv64v2(unsigned long fd,
830 const struct iovec __user *vec,
831 unsigned long vlen, loff_t pos, rwf_t flags);
832 #endif
833
834 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
835 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
836 const struct iovec __user *vec,
837 unsigned long vlen, loff_t pos, rwf_t flags);
838 #endif
839
840
841 /*
842 * Deprecated system calls which are still defined in
843 * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
844 */
845
846 /* __ARCH_WANT_SYSCALL_NO_AT */
847 asmlinkage long compat_sys_open(const char __user *filename, int flags,
848 umode_t mode);
849
850 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
851 asmlinkage long compat_sys_signalfd(int ufd,
852 const compat_sigset_t __user *sigmask,
853 compat_size_t sigsetsize);
854
855 /* __ARCH_WANT_SYSCALL_OFF_T */
856 asmlinkage long compat_sys_newstat(const char __user *filename,
857 struct compat_stat __user *statbuf);
858 asmlinkage long compat_sys_newlstat(const char __user *filename,
859 struct compat_stat __user *statbuf);
860
861 /* __ARCH_WANT_SYSCALL_DEPRECATED */
862 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
863 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
864 struct old_timeval32 __user *tvp);
865 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
866 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
867 unsigned flags);
868
869 /* obsolete: fs/readdir.c */
870 asmlinkage long compat_sys_old_readdir(unsigned int fd,
871 struct compat_old_linux_dirent __user *,
872 unsigned int count);
873
874 /* obsolete: fs/select.c */
875 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
876
877 /* obsolete: ipc */
878 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
879
880 /* obsolete: kernel/signal.c */
881 #ifdef __ARCH_WANT_SYS_SIGPENDING
882 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
883 #endif
884
885 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
886 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
887 compat_old_sigset_t __user *oset);
888 #endif
889 #ifdef CONFIG_COMPAT_OLD_SIGACTION
890 asmlinkage long compat_sys_sigaction(int sig,
891 const struct compat_old_sigaction __user *act,
892 struct compat_old_sigaction __user *oact);
893 #endif
894
895 /* obsolete: net/socket.c */
896 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
897
898 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
899
900 /**
901 * ns_to_old_timeval32 - Compat version of ns_to_timeval
902 * @nsec: the nanoseconds value to be converted
903 *
904 * Returns the old_timeval32 representation of the nsec parameter.
905 */
ns_to_old_timeval32(s64 nsec)906 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
907 {
908 struct __kernel_old_timeval tv;
909 struct old_timeval32 ctv;
910
911 tv = ns_to_kernel_old_timeval(nsec);
912 ctv.tv_sec = tv.tv_sec;
913 ctv.tv_usec = tv.tv_usec;
914
915 return ctv;
916 }
917
918 /*
919 * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
920 * directly. Instead, use one of the functions which work equivalently, such
921 * as the kcompat_sys_xyzyyz() functions prototyped below.
922 */
923
924 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
925 struct compat_statfs64 __user * buf);
926 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
927 struct compat_statfs64 __user * buf);
928
929 #ifdef CONFIG_COMPAT
930
931 /*
932 * For most but not all architectures, "am I in a compat syscall?" and
933 * "am I a compat task?" are the same question. For architectures on which
934 * they aren't the same question, arch code can override in_compat_syscall.
935 */
936 #ifndef in_compat_syscall
in_compat_syscall(void)937 static inline bool in_compat_syscall(void) { return is_compat_task(); }
938 #endif
939
940 #else /* !CONFIG_COMPAT */
941
942 #define is_compat_task() (0)
943 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
944 #define in_compat_syscall in_compat_syscall
in_compat_syscall(void)945 static inline bool in_compat_syscall(void) { return false; }
946
947 #endif /* CONFIG_COMPAT */
948
949 #define BITS_PER_COMPAT_LONG (8*sizeof(compat_long_t))
950
951 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
952
953 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
954 unsigned long bitmap_size);
955 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
956 unsigned long bitmap_size);
957
958 /*
959 * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
960 * types, and will need special compat treatment for that. Most architectures
961 * don't need that special handling even for compat syscalls.
962 */
963 #ifndef compat_need_64bit_alignment_fixup
964 #define compat_need_64bit_alignment_fixup() false
965 #endif
966
967 /*
968 * A pointer passed in from user mode. This should not
969 * be used for syscall parameters, just declare them
970 * as pointers because the syscall entry code will have
971 * appropriately converted them already.
972 */
973 #ifndef compat_ptr
compat_ptr(compat_uptr_t uptr)974 static inline void __user *compat_ptr(compat_uptr_t uptr)
975 {
976 return (void __user *)(unsigned long)uptr;
977 }
978 #endif
979
ptr_to_compat(void __user * uptr)980 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
981 {
982 return (u32)(unsigned long)uptr;
983 }
984
985 #endif /* _LINUX_COMPAT_H */
986
