1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_COMPAT_H
3 #define _LINUX_COMPAT_H
4 /*
5 * These are the type definitions for the architecture specific
6 * syscall compatibility layer.
7 */
8
9 #include <linux/types.h>
10 #include <linux/time.h>
11
12 #include <linux/stat.h>
13 #include <linux/param.h> /* for HZ */
14 #include <linux/sem.h>
15 #include <linux/socket.h>
16 #include <linux/if.h>
17 #include <linux/fs.h>
18 #include <linux/aio_abi.h> /* for aio_context_t */
19 #include <linux/uaccess.h>
20 #include <linux/unistd.h>
21
22 #include <asm/compat.h>
23 #include <asm/siginfo.h>
24 #include <asm/signal.h>
25
26 #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
27 /*
28 * It may be useful for an architecture to override the definitions of the
29 * COMPAT_SYSCALL_DEFINE0 and COMPAT_SYSCALL_DEFINEx() macros, in particular
30 * to use a different calling convention for syscalls. To allow for that,
31 + the prototypes for the compat_sys_*() functions below will *not* be included
32 * if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
33 */
34 #include <asm/syscall_wrapper.h>
35 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
36
37 #ifndef COMPAT_USE_64BIT_TIME
38 #define COMPAT_USE_64BIT_TIME 0
39 #endif
40
41 #ifndef __SC_DELOUSE
42 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
43 #endif
44
45 #ifndef COMPAT_SYSCALL_DEFINE0
46 #define COMPAT_SYSCALL_DEFINE0(name) \
47 asmlinkage long compat_sys_##name(void); \
48 ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
49 asmlinkage long compat_sys_##name(void)
50 #endif /* COMPAT_SYSCALL_DEFINE0 */
51
52 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
53 COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
54 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
55 COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
56 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
57 COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
58 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
59 COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
60 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
61 COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
62 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
63 COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
64
65 /*
66 * The asmlinkage stub is aliased to a function named __se_compat_sys_*() which
67 * sign-extends 32-bit ints to longs whenever needed. The actual work is
68 * done within __do_compat_sys_*().
69 */
70 #ifndef COMPAT_SYSCALL_DEFINEx
71 #define COMPAT_SYSCALL_DEFINEx(x, name, ...) \
72 __diag_push(); \
73 __diag_ignore(GCC, 8, "-Wattribute-alias", \
74 "Type aliasing is used to sanitize syscall arguments");\
75 asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
76 __attribute__((alias(__stringify(__se_compat_sys##name)))); \
77 ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO); \
78 static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
79 asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
80 asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
81 { \
82 long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
83 __MAP(x,__SC_TEST,__VA_ARGS__); \
84 return ret; \
85 } \
86 __diag_pop(); \
87 static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
88 #endif /* COMPAT_SYSCALL_DEFINEx */
89
90 struct compat_iovec {
91 compat_uptr_t iov_base;
92 compat_size_t iov_len;
93 };
94
95 #ifndef compat_user_stack_pointer
96 #define compat_user_stack_pointer() current_user_stack_pointer()
97 #endif
98 #ifndef compat_sigaltstack /* we'll need that for MIPS */
99 typedef struct compat_sigaltstack {
100 compat_uptr_t ss_sp;
101 int ss_flags;
102 compat_size_t ss_size;
103 } compat_stack_t;
104 #endif
105 #ifndef COMPAT_MINSIGSTKSZ
106 #define COMPAT_MINSIGSTKSZ MINSIGSTKSZ
107 #endif
108
109 #define compat_jiffies_to_clock_t(x) \
110 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
111
112 typedef __compat_uid32_t compat_uid_t;
113 typedef __compat_gid32_t compat_gid_t;
114
115 struct compat_sel_arg_struct;
116 struct rusage;
117
118 struct old_itimerval32;
119
120 struct compat_tms {
121 compat_clock_t tms_utime;
122 compat_clock_t tms_stime;
123 compat_clock_t tms_cutime;
124 compat_clock_t tms_cstime;
125 };
126
127 #define _COMPAT_NSIG_WORDS (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
128
129 #ifndef compat_sigset_t
130 typedef struct {
131 compat_sigset_word sig[_COMPAT_NSIG_WORDS];
132 } compat_sigset_t;
133 #endif
134
135 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
136 size_t sigsetsize);
137
138 struct compat_sigaction {
139 #ifndef __ARCH_HAS_IRIX_SIGACTION
140 compat_uptr_t sa_handler;
141 compat_ulong_t sa_flags;
142 #else
143 compat_uint_t sa_flags;
144 compat_uptr_t sa_handler;
145 #endif
146 #ifdef __ARCH_HAS_SA_RESTORER
147 compat_uptr_t sa_restorer;
148 #endif
149 compat_sigset_t sa_mask __packed;
150 };
151
152 typedef union compat_sigval {
153 compat_int_t sival_int;
154 compat_uptr_t sival_ptr;
155 } compat_sigval_t;
156
157 typedef struct compat_siginfo {
158 int si_signo;
159 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
160 int si_errno;
161 int si_code;
162 #else
163 int si_code;
164 int si_errno;
165 #endif
166
167 union {
168 int _pad[128/sizeof(int) - 3];
169
170 /* kill() */
171 struct {
172 compat_pid_t _pid; /* sender's pid */
173 __compat_uid32_t _uid; /* sender's uid */
174 } _kill;
175
176 /* POSIX.1b timers */
177 struct {
178 compat_timer_t _tid; /* timer id */
179 int _overrun; /* overrun count */
180 compat_sigval_t _sigval; /* same as below */
181 } _timer;
182
183 /* POSIX.1b signals */
184 struct {
185 compat_pid_t _pid; /* sender's pid */
186 __compat_uid32_t _uid; /* sender's uid */
187 compat_sigval_t _sigval;
188 } _rt;
189
190 /* SIGCHLD */
191 struct {
192 compat_pid_t _pid; /* which child */
193 __compat_uid32_t _uid; /* sender's uid */
194 int _status; /* exit code */
195 compat_clock_t _utime;
196 compat_clock_t _stime;
197 } _sigchld;
198
199 #ifdef CONFIG_X86_X32_ABI
200 /* SIGCHLD (x32 version) */
201 struct {
202 compat_pid_t _pid; /* which child */
203 __compat_uid32_t _uid; /* sender's uid */
204 int _status; /* exit code */
205 compat_s64 _utime;
206 compat_s64 _stime;
207 } _sigchld_x32;
208 #endif
209
210 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
211 struct {
212 compat_uptr_t _addr; /* faulting insn/memory ref. */
213 #define __COMPAT_ADDR_BND_PKEY_PAD (__alignof__(compat_uptr_t) < sizeof(short) ? \
214 sizeof(short) : __alignof__(compat_uptr_t))
215 union {
216 /* used on alpha and sparc */
217 int _trapno; /* TRAP # which caused the signal */
218 /*
219 * used when si_code=BUS_MCEERR_AR or
220 * used when si_code=BUS_MCEERR_AO
221 */
222 short int _addr_lsb; /* Valid LSB of the reported address. */
223 /* used when si_code=SEGV_BNDERR */
224 struct {
225 char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
226 compat_uptr_t _lower;
227 compat_uptr_t _upper;
228 } _addr_bnd;
229 /* used when si_code=SEGV_PKUERR */
230 struct {
231 char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
232 u32 _pkey;
233 } _addr_pkey;
234 /* used when si_code=TRAP_PERF */
235 struct {
236 compat_ulong_t _data;
237 u32 _type;
238 u32 _flags;
239 } _perf;
240 };
241 } _sigfault;
242
243 /* SIGPOLL */
244 struct {
245 compat_long_t _band; /* POLL_IN, POLL_OUT, POLL_MSG */
246 int _fd;
247 } _sigpoll;
248
249 struct {
250 compat_uptr_t _call_addr; /* calling user insn */
251 int _syscall; /* triggering system call number */
252 unsigned int _arch; /* AUDIT_ARCH_* of syscall */
253 } _sigsys;
254 } _sifields;
255 } compat_siginfo_t;
256
257 struct compat_rlimit {
258 compat_ulong_t rlim_cur;
259 compat_ulong_t rlim_max;
260 };
261
262 struct compat_rusage {
263 struct old_timeval32 ru_utime;
264 struct old_timeval32 ru_stime;
265 compat_long_t ru_maxrss;
266 compat_long_t ru_ixrss;
267 compat_long_t ru_idrss;
268 compat_long_t ru_isrss;
269 compat_long_t ru_minflt;
270 compat_long_t ru_majflt;
271 compat_long_t ru_nswap;
272 compat_long_t ru_inblock;
273 compat_long_t ru_oublock;
274 compat_long_t ru_msgsnd;
275 compat_long_t ru_msgrcv;
276 compat_long_t ru_nsignals;
277 compat_long_t ru_nvcsw;
278 compat_long_t ru_nivcsw;
279 };
280
281 extern int put_compat_rusage(const struct rusage *,
282 struct compat_rusage __user *);
283
284 struct compat_siginfo;
285 struct __compat_aio_sigset;
286
287 struct compat_dirent {
288 u32 d_ino;
289 compat_off_t d_off;
290 u16 d_reclen;
291 char d_name[256];
292 };
293
294 struct compat_ustat {
295 compat_daddr_t f_tfree;
296 compat_ino_t f_tinode;
297 char f_fname[6];
298 char f_fpack[6];
299 };
300
301 #define COMPAT_SIGEV_PAD_SIZE ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
302
303 typedef struct compat_sigevent {
304 compat_sigval_t sigev_value;
305 compat_int_t sigev_signo;
306 compat_int_t sigev_notify;
307 union {
308 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
309 compat_int_t _tid;
310
311 struct {
312 compat_uptr_t _function;
313 compat_uptr_t _attribute;
314 } _sigev_thread;
315 } _sigev_un;
316 } compat_sigevent_t;
317
318 struct compat_ifmap {
319 compat_ulong_t mem_start;
320 compat_ulong_t mem_end;
321 unsigned short base_addr;
322 unsigned char irq;
323 unsigned char dma;
324 unsigned char port;
325 };
326
327 struct compat_if_settings {
328 unsigned int type; /* Type of physical device or protocol */
329 unsigned int size; /* Size of the data allocated by the caller */
330 compat_uptr_t ifs_ifsu; /* union of pointers */
331 };
332
333 struct compat_ifreq {
334 union {
335 char ifrn_name[IFNAMSIZ]; /* if name, e.g. "en0" */
336 } ifr_ifrn;
337 union {
338 struct sockaddr ifru_addr;
339 struct sockaddr ifru_dstaddr;
340 struct sockaddr ifru_broadaddr;
341 struct sockaddr ifru_netmask;
342 struct sockaddr ifru_hwaddr;
343 short ifru_flags;
344 compat_int_t ifru_ivalue;
345 compat_int_t ifru_mtu;
346 struct compat_ifmap ifru_map;
347 char ifru_slave[IFNAMSIZ]; /* Just fits the size */
348 char ifru_newname[IFNAMSIZ];
349 compat_caddr_t ifru_data;
350 struct compat_if_settings ifru_settings;
351 } ifr_ifru;
352 };
353
354 struct compat_ifconf {
355 compat_int_t ifc_len; /* size of buffer */
356 compat_caddr_t ifcbuf;
357 };
358
359 struct compat_robust_list {
360 compat_uptr_t next;
361 };
362
363 struct compat_robust_list_head {
364 struct compat_robust_list list;
365 compat_long_t futex_offset;
366 compat_uptr_t list_op_pending;
367 };
368
369 #ifdef CONFIG_COMPAT_OLD_SIGACTION
370 struct compat_old_sigaction {
371 compat_uptr_t sa_handler;
372 compat_old_sigset_t sa_mask;
373 compat_ulong_t sa_flags;
374 compat_uptr_t sa_restorer;
375 };
376 #endif
377
378 struct compat_keyctl_kdf_params {
379 compat_uptr_t hashname;
380 compat_uptr_t otherinfo;
381 __u32 otherinfolen;
382 __u32 __spare[8];
383 };
384
385 struct compat_stat;
386 struct compat_statfs;
387 struct compat_statfs64;
388 struct compat_old_linux_dirent;
389 struct compat_linux_dirent;
390 struct linux_dirent64;
391 struct compat_msghdr;
392 struct compat_mmsghdr;
393 struct compat_sysinfo;
394 struct compat_sysctl_args;
395 struct compat_kexec_segment;
396 struct compat_mq_attr;
397 struct compat_msgbuf;
398
399 void copy_siginfo_to_external32(struct compat_siginfo *to,
400 const struct kernel_siginfo *from);
401 int copy_siginfo_from_user32(kernel_siginfo_t *to,
402 const struct compat_siginfo __user *from);
403 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
404 const kernel_siginfo_t *from);
405 #ifndef copy_siginfo_to_user32
406 #define copy_siginfo_to_user32 __copy_siginfo_to_user32
407 #endif
408 int get_compat_sigevent(struct sigevent *event,
409 const struct compat_sigevent __user *u_event);
410
411 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
412
413 /*
414 * Defined inline such that size can be compile time constant, which avoids
415 * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
416 */
417 static inline int
put_compat_sigset(compat_sigset_t __user * compat,const sigset_t * set,unsigned int size)418 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
419 unsigned int size)
420 {
421 /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
422 #if defined(__BIG_ENDIAN) && defined(CONFIG_64BIT)
423 compat_sigset_t v;
424 switch (_NSIG_WORDS) {
425 case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
426 fallthrough;
427 case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
428 fallthrough;
429 case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
430 fallthrough;
431 case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
432 }
433 return copy_to_user(compat, &v, size) ? -EFAULT : 0;
434 #else
435 return copy_to_user(compat, set, size) ? -EFAULT : 0;
436 #endif
437 }
438
439 #ifdef CONFIG_CPU_BIG_ENDIAN
440 #define unsafe_put_compat_sigset(compat, set, label) do { \
441 compat_sigset_t __user *__c = compat; \
442 const sigset_t *__s = set; \
443 \
444 switch (_NSIG_WORDS) { \
445 case 4: \
446 unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label); \
447 unsafe_put_user(__s->sig[3], &__c->sig[6], label); \
448 fallthrough; \
449 case 3: \
450 unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label); \
451 unsafe_put_user(__s->sig[2], &__c->sig[4], label); \
452 fallthrough; \
453 case 2: \
454 unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label); \
455 unsafe_put_user(__s->sig[1], &__c->sig[2], label); \
456 fallthrough; \
457 case 1: \
458 unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label); \
459 unsafe_put_user(__s->sig[0], &__c->sig[0], label); \
460 } \
461 } while (0)
462
463 #define unsafe_get_compat_sigset(set, compat, label) do { \
464 const compat_sigset_t __user *__c = compat; \
465 compat_sigset_word hi, lo; \
466 sigset_t *__s = set; \
467 \
468 switch (_NSIG_WORDS) { \
469 case 4: \
470 unsafe_get_user(lo, &__c->sig[7], label); \
471 unsafe_get_user(hi, &__c->sig[6], label); \
472 __s->sig[3] = hi | (((long)lo) << 32); \
473 fallthrough; \
474 case 3: \
475 unsafe_get_user(lo, &__c->sig[5], label); \
476 unsafe_get_user(hi, &__c->sig[4], label); \
477 __s->sig[2] = hi | (((long)lo) << 32); \
478 fallthrough; \
479 case 2: \
480 unsafe_get_user(lo, &__c->sig[3], label); \
481 unsafe_get_user(hi, &__c->sig[2], label); \
482 __s->sig[1] = hi | (((long)lo) << 32); \
483 fallthrough; \
484 case 1: \
485 unsafe_get_user(lo, &__c->sig[1], label); \
486 unsafe_get_user(hi, &__c->sig[0], label); \
487 __s->sig[0] = hi | (((long)lo) << 32); \
488 } \
489 } while (0)
490 #else
491 #define unsafe_put_compat_sigset(compat, set, label) do { \
492 compat_sigset_t __user *__c = compat; \
493 const sigset_t *__s = set; \
494 \
495 unsafe_copy_to_user(__c, __s, sizeof(*__c), label); \
496 } while (0)
497
498 #define unsafe_get_compat_sigset(set, compat, label) do { \
499 const compat_sigset_t __user *__c = compat; \
500 sigset_t *__s = set; \
501 \
502 unsafe_copy_from_user(__s, __c, sizeof(*__c), label); \
503 } while (0)
504 #endif
505
506 extern int compat_ptrace_request(struct task_struct *child,
507 compat_long_t request,
508 compat_ulong_t addr, compat_ulong_t data);
509
510 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
511 compat_ulong_t addr, compat_ulong_t data);
512
513 struct epoll_event; /* fortunately, this one is fixed-layout */
514
515 int compat_restore_altstack(const compat_stack_t __user *uss);
516 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
517 #define unsafe_compat_save_altstack(uss, sp, label) do { \
518 compat_stack_t __user *__uss = uss; \
519 struct task_struct *t = current; \
520 unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
521 &__uss->ss_sp, label); \
522 unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
523 unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
524 } while (0);
525
526 /*
527 * These syscall function prototypes are kept in the same order as
528 * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
529 * go below.
530 *
531 * Please note that these prototypes here are only provided for information
532 * purposes, for static analysis, and for linking from the syscall table.
533 * These functions should not be called elsewhere from kernel code.
534 *
535 * As the syscall calling convention may be different from the default
536 * for architectures overriding the syscall calling convention, do not
537 * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
538 */
539 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
540 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
541 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
542 u32 __user *iocb);
543 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
544 compat_long_t min_nr,
545 compat_long_t nr,
546 struct io_event __user *events,
547 struct old_timespec32 __user *timeout,
548 const struct __compat_aio_sigset __user *usig);
549 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
550 compat_long_t min_nr,
551 compat_long_t nr,
552 struct io_event __user *events,
553 struct __kernel_timespec __user *timeout,
554 const struct __compat_aio_sigset __user *usig);
555
556 /* fs/cookies.c */
557 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
558
559 /* fs/eventpoll.c */
560 asmlinkage long compat_sys_epoll_pwait(int epfd,
561 struct epoll_event __user *events,
562 int maxevents, int timeout,
563 const compat_sigset_t __user *sigmask,
564 compat_size_t sigsetsize);
565 asmlinkage long compat_sys_epoll_pwait2(int epfd,
566 struct epoll_event __user *events,
567 int maxevents,
568 const struct __kernel_timespec __user *timeout,
569 const compat_sigset_t __user *sigmask,
570 compat_size_t sigsetsize);
571
572 /* fs/fcntl.c */
573 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
574 compat_ulong_t arg);
575 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
576 compat_ulong_t arg);
577
578 /* fs/ioctl.c */
579 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
580 compat_ulong_t arg);
581
582 /* fs/open.c */
583 asmlinkage long compat_sys_statfs(const char __user *pathname,
584 struct compat_statfs __user *buf);
585 asmlinkage long compat_sys_statfs64(const char __user *pathname,
586 compat_size_t sz,
587 struct compat_statfs64 __user *buf);
588 asmlinkage long compat_sys_fstatfs(unsigned int fd,
589 struct compat_statfs __user *buf);
590 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
591 struct compat_statfs64 __user *buf);
592 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
593 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
594 /* No generic prototype for truncate64, ftruncate64, fallocate */
595 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
596 int flags, umode_t mode);
597
598 /* fs/readdir.c */
599 asmlinkage long compat_sys_getdents(unsigned int fd,
600 struct compat_linux_dirent __user *dirent,
601 unsigned int count);
602
603 /* fs/read_write.c */
604 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
605 /* No generic prototype for pread64 and pwrite64 */
606 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
607 const struct iovec __user *vec,
608 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
609 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
610 const struct iovec __user *vec,
611 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
612 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
613 asmlinkage long compat_sys_preadv64(unsigned long fd,
614 const struct iovec __user *vec,
615 unsigned long vlen, loff_t pos);
616 #endif
617
618 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
619 asmlinkage long compat_sys_pwritev64(unsigned long fd,
620 const struct iovec __user *vec,
621 unsigned long vlen, loff_t pos);
622 #endif
623
624 /* fs/sendfile.c */
625 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
626 compat_off_t __user *offset, compat_size_t count);
627 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
628 compat_loff_t __user *offset, compat_size_t count);
629
630 /* fs/select.c */
631 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
632 compat_ulong_t __user *outp,
633 compat_ulong_t __user *exp,
634 struct old_timespec32 __user *tsp,
635 void __user *sig);
636 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
637 compat_ulong_t __user *outp,
638 compat_ulong_t __user *exp,
639 struct __kernel_timespec __user *tsp,
640 void __user *sig);
641 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
642 unsigned int nfds,
643 struct old_timespec32 __user *tsp,
644 const compat_sigset_t __user *sigmask,
645 compat_size_t sigsetsize);
646 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
647 unsigned int nfds,
648 struct __kernel_timespec __user *tsp,
649 const compat_sigset_t __user *sigmask,
650 compat_size_t sigsetsize);
651
652 /* fs/signalfd.c */
653 asmlinkage long compat_sys_signalfd4(int ufd,
654 const compat_sigset_t __user *sigmask,
655 compat_size_t sigsetsize, int flags);
656
657 /* fs/stat.c */
658 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
659 const char __user *filename,
660 struct compat_stat __user *statbuf,
661 int flag);
662 asmlinkage long compat_sys_newfstat(unsigned int fd,
663 struct compat_stat __user *statbuf);
664
665 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
666
667 /* kernel/exit.c */
668 asmlinkage long compat_sys_waitid(int, compat_pid_t,
669 struct compat_siginfo __user *, int,
670 struct compat_rusage __user *);
671
672
673
674 /* kernel/futex.c */
675 asmlinkage long
676 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
677 compat_size_t len);
678 asmlinkage long
679 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
680 compat_size_t __user *len_ptr);
681
682 /* kernel/itimer.c */
683 asmlinkage long compat_sys_getitimer(int which,
684 struct old_itimerval32 __user *it);
685 asmlinkage long compat_sys_setitimer(int which,
686 struct old_itimerval32 __user *in,
687 struct old_itimerval32 __user *out);
688
689 /* kernel/kexec.c */
690 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
691 compat_ulong_t nr_segments,
692 struct compat_kexec_segment __user *,
693 compat_ulong_t flags);
694
695 /* kernel/posix-timers.c */
696 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
697 struct compat_sigevent __user *timer_event_spec,
698 timer_t __user *created_timer_id);
699
700 /* kernel/ptrace.c */
701 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
702 compat_long_t addr, compat_long_t data);
703
704 /* kernel/sched/core.c */
705 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
706 unsigned int len,
707 compat_ulong_t __user *user_mask_ptr);
708 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
709 unsigned int len,
710 compat_ulong_t __user *user_mask_ptr);
711
712 /* kernel/signal.c */
713 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
714 compat_stack_t __user *uoss_ptr);
715 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
716 compat_size_t sigsetsize);
717 #ifndef CONFIG_ODD_RT_SIGACTION
718 asmlinkage long compat_sys_rt_sigaction(int,
719 const struct compat_sigaction __user *,
720 struct compat_sigaction __user *,
721 compat_size_t);
722 #endif
723 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
724 compat_sigset_t __user *oset,
725 compat_size_t sigsetsize);
726 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
727 compat_size_t sigsetsize);
728 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
729 struct compat_siginfo __user *uinfo,
730 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
731 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
732 struct compat_siginfo __user *uinfo,
733 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
734 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
735 struct compat_siginfo __user *uinfo);
736 /* No generic prototype for rt_sigreturn */
737
738 /* kernel/sys.c */
739 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
740 asmlinkage long compat_sys_getrlimit(unsigned int resource,
741 struct compat_rlimit __user *rlim);
742 asmlinkage long compat_sys_setrlimit(unsigned int resource,
743 struct compat_rlimit __user *rlim);
744 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
745
746 /* kernel/time.c */
747 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
748 struct timezone __user *tz);
749 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
750 struct timezone __user *tz);
751
752 /* kernel/timer.c */
753 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
754
755 /* ipc/mqueue.c */
756 asmlinkage long compat_sys_mq_open(const char __user *u_name,
757 int oflag, compat_mode_t mode,
758 struct compat_mq_attr __user *u_attr);
759 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
760 const struct compat_sigevent __user *u_notification);
761 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
762 const struct compat_mq_attr __user *u_mqstat,
763 struct compat_mq_attr __user *u_omqstat);
764
765 /* ipc/msg.c */
766 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
767 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
768 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
769 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
770 compat_ssize_t msgsz, int msgflg);
771
772 /* ipc/sem.c */
773 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
774
775 /* ipc/shm.c */
776 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
777 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
778
779 /* net/socket.c */
780 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
781 unsigned flags, struct sockaddr __user *addr,
782 int __user *addrlen);
783 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
784 unsigned flags);
785 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
786 unsigned int flags);
787
788 /* mm/filemap.c: No generic prototype for readahead */
789
790 /* security/keys/keyctl.c */
791 asmlinkage long compat_sys_keyctl(u32 option,
792 u32 arg2, u32 arg3, u32 arg4, u32 arg5);
793
794 /* arch/example/kernel/sys_example.c */
795 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
796 const compat_uptr_t __user *envp);
797
798 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
799
800 /* mm/, CONFIG_MMU only */
801 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
802 compat_pid_t pid, int sig,
803 struct compat_siginfo __user *uinfo);
804 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
805 unsigned vlen, unsigned int flags,
806 struct __kernel_timespec __user *timeout);
807 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
808 unsigned vlen, unsigned int flags,
809 struct old_timespec32 __user *timeout);
810 asmlinkage long compat_sys_wait4(compat_pid_t pid,
811 compat_uint_t __user *stat_addr, int options,
812 struct compat_rusage __user *ru);
813 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
814 int, const char __user *);
815 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
816 struct file_handle __user *handle,
817 int flags);
818 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
819 unsigned vlen, unsigned int flags);
820 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
821 const compat_uptr_t __user *argv,
822 const compat_uptr_t __user *envp, int flags);
823 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
824 const struct iovec __user *vec,
825 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
826 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
827 const struct iovec __user *vec,
828 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
829 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
830 asmlinkage long compat_sys_preadv64v2(unsigned long fd,
831 const struct iovec __user *vec,
832 unsigned long vlen, loff_t pos, rwf_t flags);
833 #endif
834
835 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
836 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
837 const struct iovec __user *vec,
838 unsigned long vlen, loff_t pos, rwf_t flags);
839 #endif
840
841
842 /*
843 * Deprecated system calls which are still defined in
844 * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
845 */
846
847 /* __ARCH_WANT_SYSCALL_NO_AT */
848 asmlinkage long compat_sys_open(const char __user *filename, int flags,
849 umode_t mode);
850
851 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
852 asmlinkage long compat_sys_signalfd(int ufd,
853 const compat_sigset_t __user *sigmask,
854 compat_size_t sigsetsize);
855
856 /* __ARCH_WANT_SYSCALL_OFF_T */
857 asmlinkage long compat_sys_newstat(const char __user *filename,
858 struct compat_stat __user *statbuf);
859 asmlinkage long compat_sys_newlstat(const char __user *filename,
860 struct compat_stat __user *statbuf);
861
862 /* __ARCH_WANT_SYSCALL_DEPRECATED */
863 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
864 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
865 struct old_timeval32 __user *tvp);
866 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
867 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
868 unsigned flags);
869
870 /* obsolete: fs/readdir.c */
871 asmlinkage long compat_sys_old_readdir(unsigned int fd,
872 struct compat_old_linux_dirent __user *,
873 unsigned int count);
874
875 /* obsolete: fs/select.c */
876 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
877
878 /* obsolete: ipc */
879 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
880
881 /* obsolete: kernel/signal.c */
882 #ifdef __ARCH_WANT_SYS_SIGPENDING
883 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
884 #endif
885
886 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
887 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
888 compat_old_sigset_t __user *oset);
889 #endif
890 #ifdef CONFIG_COMPAT_OLD_SIGACTION
891 asmlinkage long compat_sys_sigaction(int sig,
892 const struct compat_old_sigaction __user *act,
893 struct compat_old_sigaction __user *oact);
894 #endif
895
896 /* obsolete: net/socket.c */
897 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
898
899 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
900
901 /**
902 * ns_to_old_timeval32 - Compat version of ns_to_timeval
903 * @nsec: the nanoseconds value to be converted
904 *
905 * Returns the old_timeval32 representation of the nsec parameter.
906 */
ns_to_old_timeval32(s64 nsec)907 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
908 {
909 struct __kernel_old_timeval tv;
910 struct old_timeval32 ctv;
911
912 tv = ns_to_kernel_old_timeval(nsec);
913 ctv.tv_sec = tv.tv_sec;
914 ctv.tv_usec = tv.tv_usec;
915
916 return ctv;
917 }
918
919 /*
920 * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
921 * directly. Instead, use one of the functions which work equivalently, such
922 * as the kcompat_sys_xyzyyz() functions prototyped below.
923 */
924
925 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
926 struct compat_statfs64 __user * buf);
927 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
928 struct compat_statfs64 __user * buf);
929
930 #ifdef CONFIG_COMPAT
931
932 /*
933 * For most but not all architectures, "am I in a compat syscall?" and
934 * "am I a compat task?" are the same question. For architectures on which
935 * they aren't the same question, arch code can override in_compat_syscall.
936 */
937 #ifndef in_compat_syscall
in_compat_syscall(void)938 static inline bool in_compat_syscall(void) { return is_compat_task(); }
939 #endif
940
941 #else /* !CONFIG_COMPAT */
942
943 #define is_compat_task() (0)
944 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
945 #define in_compat_syscall in_compat_syscall
in_compat_syscall(void)946 static inline bool in_compat_syscall(void) { return false; }
947
948 #endif /* CONFIG_COMPAT */
949
950 #define BITS_PER_COMPAT_LONG (8*sizeof(compat_long_t))
951
952 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
953
954 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
955 unsigned long bitmap_size);
956 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
957 unsigned long bitmap_size);
958
959 /*
960 * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
961 * types, and will need special compat treatment for that. Most architectures
962 * don't need that special handling even for compat syscalls.
963 */
964 #ifndef compat_need_64bit_alignment_fixup
965 #define compat_need_64bit_alignment_fixup() false
966 #endif
967
968 /*
969 * A pointer passed in from user mode. This should not
970 * be used for syscall parameters, just declare them
971 * as pointers because the syscall entry code will have
972 * appropriately converted them already.
973 */
974 #ifndef compat_ptr
compat_ptr(compat_uptr_t uptr)975 static inline void __user *compat_ptr(compat_uptr_t uptr)
976 {
977 return (void __user *)(unsigned long)uptr;
978 }
979 #endif
980
ptr_to_compat(void __user * uptr)981 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
982 {
983 return (u32)(unsigned long)uptr;
984 }
985
986 #endif /* _LINUX_COMPAT_H */
987