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 typedef struct {
130 compat_sigset_word sig[_COMPAT_NSIG_WORDS];
131 } compat_sigset_t;
132
133 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
134 size_t sigsetsize);
135
136 struct compat_sigaction {
137 #ifndef __ARCH_HAS_IRIX_SIGACTION
138 compat_uptr_t sa_handler;
139 compat_ulong_t sa_flags;
140 #else
141 compat_uint_t sa_flags;
142 compat_uptr_t sa_handler;
143 #endif
144 #ifdef __ARCH_HAS_SA_RESTORER
145 compat_uptr_t sa_restorer;
146 #endif
147 compat_sigset_t sa_mask __packed;
148 };
149
150 typedef union compat_sigval {
151 compat_int_t sival_int;
152 compat_uptr_t sival_ptr;
153 } compat_sigval_t;
154
155 typedef struct compat_siginfo {
156 int si_signo;
157 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
158 int si_errno;
159 int si_code;
160 #else
161 int si_code;
162 int si_errno;
163 #endif
164
165 union {
166 int _pad[128/sizeof(int) - 3];
167
168 /* kill() */
169 struct {
170 compat_pid_t _pid; /* sender's pid */
171 __compat_uid32_t _uid; /* sender's uid */
172 } _kill;
173
174 /* POSIX.1b timers */
175 struct {
176 compat_timer_t _tid; /* timer id */
177 int _overrun; /* overrun count */
178 compat_sigval_t _sigval; /* same as below */
179 } _timer;
180
181 /* POSIX.1b signals */
182 struct {
183 compat_pid_t _pid; /* sender's pid */
184 __compat_uid32_t _uid; /* sender's uid */
185 compat_sigval_t _sigval;
186 } _rt;
187
188 /* SIGCHLD */
189 struct {
190 compat_pid_t _pid; /* which child */
191 __compat_uid32_t _uid; /* sender's uid */
192 int _status; /* exit code */
193 compat_clock_t _utime;
194 compat_clock_t _stime;
195 } _sigchld;
196
197 #ifdef CONFIG_X86_X32_ABI
198 /* SIGCHLD (x32 version) */
199 struct {
200 compat_pid_t _pid; /* which child */
201 __compat_uid32_t _uid; /* sender's uid */
202 int _status; /* exit code */
203 compat_s64 _utime;
204 compat_s64 _stime;
205 } _sigchld_x32;
206 #endif
207
208 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
209 struct {
210 compat_uptr_t _addr; /* faulting insn/memory ref. */
211 #define __COMPAT_ADDR_BND_PKEY_PAD (__alignof__(compat_uptr_t) < sizeof(short) ? \
212 sizeof(short) : __alignof__(compat_uptr_t))
213 union {
214 /* used on alpha and sparc */
215 int _trapno; /* TRAP # which caused the signal */
216 /*
217 * used when si_code=BUS_MCEERR_AR or
218 * used when si_code=BUS_MCEERR_AO
219 */
220 short int _addr_lsb; /* Valid LSB of the reported address. */
221 /* used when si_code=SEGV_BNDERR */
222 struct {
223 char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
224 compat_uptr_t _lower;
225 compat_uptr_t _upper;
226 } _addr_bnd;
227 /* used when si_code=SEGV_PKUERR */
228 struct {
229 char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
230 u32 _pkey;
231 } _addr_pkey;
232 /* used when si_code=TRAP_PERF */
233 struct {
234 compat_ulong_t _data;
235 u32 _type;
236 u32 _flags;
237 } _perf;
238 };
239 } _sigfault;
240
241 /* SIGPOLL */
242 struct {
243 compat_long_t _band; /* POLL_IN, POLL_OUT, POLL_MSG */
244 int _fd;
245 } _sigpoll;
246
247 struct {
248 compat_uptr_t _call_addr; /* calling user insn */
249 int _syscall; /* triggering system call number */
250 unsigned int _arch; /* AUDIT_ARCH_* of syscall */
251 } _sigsys;
252 } _sifields;
253 } compat_siginfo_t;
254
255 struct compat_rlimit {
256 compat_ulong_t rlim_cur;
257 compat_ulong_t rlim_max;
258 };
259
260 #ifdef __ARCH_NEED_COMPAT_FLOCK64_PACKED
261 #define __ARCH_COMPAT_FLOCK64_PACK __attribute__((packed))
262 #else
263 #define __ARCH_COMPAT_FLOCK64_PACK
264 #endif
265
266 struct compat_flock {
267 short l_type;
268 short l_whence;
269 compat_off_t l_start;
270 compat_off_t l_len;
271 #ifdef __ARCH_COMPAT_FLOCK_EXTRA_SYSID
272 __ARCH_COMPAT_FLOCK_EXTRA_SYSID
273 #endif
274 compat_pid_t l_pid;
275 #ifdef __ARCH_COMPAT_FLOCK_PAD
276 __ARCH_COMPAT_FLOCK_PAD
277 #endif
278 };
279
280 struct compat_flock64 {
281 short l_type;
282 short l_whence;
283 compat_loff_t l_start;
284 compat_loff_t l_len;
285 compat_pid_t l_pid;
286 #ifdef __ARCH_COMPAT_FLOCK64_PAD
287 __ARCH_COMPAT_FLOCK64_PAD
288 #endif
289 } __ARCH_COMPAT_FLOCK64_PACK;
290
291 struct compat_rusage {
292 struct old_timeval32 ru_utime;
293 struct old_timeval32 ru_stime;
294 compat_long_t ru_maxrss;
295 compat_long_t ru_ixrss;
296 compat_long_t ru_idrss;
297 compat_long_t ru_isrss;
298 compat_long_t ru_minflt;
299 compat_long_t ru_majflt;
300 compat_long_t ru_nswap;
301 compat_long_t ru_inblock;
302 compat_long_t ru_oublock;
303 compat_long_t ru_msgsnd;
304 compat_long_t ru_msgrcv;
305 compat_long_t ru_nsignals;
306 compat_long_t ru_nvcsw;
307 compat_long_t ru_nivcsw;
308 };
309
310 extern int put_compat_rusage(const struct rusage *,
311 struct compat_rusage __user *);
312
313 struct compat_siginfo;
314 struct __compat_aio_sigset;
315
316 struct compat_dirent {
317 u32 d_ino;
318 compat_off_t d_off;
319 u16 d_reclen;
320 char d_name[256];
321 };
322
323 struct compat_ustat {
324 compat_daddr_t f_tfree;
325 compat_ino_t f_tinode;
326 char f_fname[6];
327 char f_fpack[6];
328 };
329
330 #define COMPAT_SIGEV_PAD_SIZE ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
331
332 typedef struct compat_sigevent {
333 compat_sigval_t sigev_value;
334 compat_int_t sigev_signo;
335 compat_int_t sigev_notify;
336 union {
337 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
338 compat_int_t _tid;
339
340 struct {
341 compat_uptr_t _function;
342 compat_uptr_t _attribute;
343 } _sigev_thread;
344 } _sigev_un;
345 } compat_sigevent_t;
346
347 struct compat_ifmap {
348 compat_ulong_t mem_start;
349 compat_ulong_t mem_end;
350 unsigned short base_addr;
351 unsigned char irq;
352 unsigned char dma;
353 unsigned char port;
354 };
355
356 struct compat_if_settings {
357 unsigned int type; /* Type of physical device or protocol */
358 unsigned int size; /* Size of the data allocated by the caller */
359 compat_uptr_t ifs_ifsu; /* union of pointers */
360 };
361
362 struct compat_ifreq {
363 union {
364 char ifrn_name[IFNAMSIZ]; /* if name, e.g. "en0" */
365 } ifr_ifrn;
366 union {
367 struct sockaddr ifru_addr;
368 struct sockaddr ifru_dstaddr;
369 struct sockaddr ifru_broadaddr;
370 struct sockaddr ifru_netmask;
371 struct sockaddr ifru_hwaddr;
372 short ifru_flags;
373 compat_int_t ifru_ivalue;
374 compat_int_t ifru_mtu;
375 struct compat_ifmap ifru_map;
376 char ifru_slave[IFNAMSIZ]; /* Just fits the size */
377 char ifru_newname[IFNAMSIZ];
378 compat_caddr_t ifru_data;
379 struct compat_if_settings ifru_settings;
380 } ifr_ifru;
381 };
382
383 struct compat_ifconf {
384 compat_int_t ifc_len; /* size of buffer */
385 compat_caddr_t ifcbuf;
386 };
387
388 struct compat_robust_list {
389 compat_uptr_t next;
390 };
391
392 struct compat_robust_list_head {
393 struct compat_robust_list list;
394 compat_long_t futex_offset;
395 compat_uptr_t list_op_pending;
396 };
397
398 #ifdef CONFIG_COMPAT_OLD_SIGACTION
399 struct compat_old_sigaction {
400 compat_uptr_t sa_handler;
401 compat_old_sigset_t sa_mask;
402 compat_ulong_t sa_flags;
403 compat_uptr_t sa_restorer;
404 };
405 #endif
406
407 struct compat_keyctl_kdf_params {
408 compat_uptr_t hashname;
409 compat_uptr_t otherinfo;
410 __u32 otherinfolen;
411 __u32 __spare[8];
412 };
413
414 struct compat_stat;
415 struct compat_statfs;
416 struct compat_statfs64;
417 struct compat_old_linux_dirent;
418 struct compat_linux_dirent;
419 struct linux_dirent64;
420 struct compat_msghdr;
421 struct compat_mmsghdr;
422 struct compat_sysinfo;
423 struct compat_sysctl_args;
424 struct compat_kexec_segment;
425 struct compat_mq_attr;
426 struct compat_msgbuf;
427
428 void copy_siginfo_to_external32(struct compat_siginfo *to,
429 const struct kernel_siginfo *from);
430 int copy_siginfo_from_user32(kernel_siginfo_t *to,
431 const struct compat_siginfo __user *from);
432 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
433 const kernel_siginfo_t *from);
434 #ifndef copy_siginfo_to_user32
435 #define copy_siginfo_to_user32 __copy_siginfo_to_user32
436 #endif
437 int get_compat_sigevent(struct sigevent *event,
438 const struct compat_sigevent __user *u_event);
439
440 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
441
442 /*
443 * Defined inline such that size can be compile time constant, which avoids
444 * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
445 */
446 static inline int
put_compat_sigset(compat_sigset_t __user * compat,const sigset_t * set,unsigned int size)447 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
448 unsigned int size)
449 {
450 /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
451 #if defined(__BIG_ENDIAN) && defined(CONFIG_64BIT)
452 compat_sigset_t v;
453 switch (_NSIG_WORDS) {
454 case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
455 fallthrough;
456 case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
457 fallthrough;
458 case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
459 fallthrough;
460 case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
461 }
462 return copy_to_user(compat, &v, size) ? -EFAULT : 0;
463 #else
464 return copy_to_user(compat, set, size) ? -EFAULT : 0;
465 #endif
466 }
467
468 #ifdef CONFIG_CPU_BIG_ENDIAN
469 #define unsafe_put_compat_sigset(compat, set, label) do { \
470 compat_sigset_t __user *__c = compat; \
471 const sigset_t *__s = set; \
472 \
473 switch (_NSIG_WORDS) { \
474 case 4: \
475 unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label); \
476 unsafe_put_user(__s->sig[3], &__c->sig[6], label); \
477 fallthrough; \
478 case 3: \
479 unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label); \
480 unsafe_put_user(__s->sig[2], &__c->sig[4], label); \
481 fallthrough; \
482 case 2: \
483 unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label); \
484 unsafe_put_user(__s->sig[1], &__c->sig[2], label); \
485 fallthrough; \
486 case 1: \
487 unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label); \
488 unsafe_put_user(__s->sig[0], &__c->sig[0], label); \
489 } \
490 } while (0)
491
492 #define unsafe_get_compat_sigset(set, compat, label) do { \
493 const compat_sigset_t __user *__c = compat; \
494 compat_sigset_word hi, lo; \
495 sigset_t *__s = set; \
496 \
497 switch (_NSIG_WORDS) { \
498 case 4: \
499 unsafe_get_user(lo, &__c->sig[7], label); \
500 unsafe_get_user(hi, &__c->sig[6], label); \
501 __s->sig[3] = hi | (((long)lo) << 32); \
502 fallthrough; \
503 case 3: \
504 unsafe_get_user(lo, &__c->sig[5], label); \
505 unsafe_get_user(hi, &__c->sig[4], label); \
506 __s->sig[2] = hi | (((long)lo) << 32); \
507 fallthrough; \
508 case 2: \
509 unsafe_get_user(lo, &__c->sig[3], label); \
510 unsafe_get_user(hi, &__c->sig[2], label); \
511 __s->sig[1] = hi | (((long)lo) << 32); \
512 fallthrough; \
513 case 1: \
514 unsafe_get_user(lo, &__c->sig[1], label); \
515 unsafe_get_user(hi, &__c->sig[0], label); \
516 __s->sig[0] = hi | (((long)lo) << 32); \
517 } \
518 } while (0)
519 #else
520 #define unsafe_put_compat_sigset(compat, set, label) do { \
521 compat_sigset_t __user *__c = compat; \
522 const sigset_t *__s = set; \
523 \
524 unsafe_copy_to_user(__c, __s, sizeof(*__c), label); \
525 } while (0)
526
527 #define unsafe_get_compat_sigset(set, compat, label) do { \
528 const compat_sigset_t __user *__c = compat; \
529 sigset_t *__s = set; \
530 \
531 unsafe_copy_from_user(__s, __c, sizeof(*__c), label); \
532 } while (0)
533 #endif
534
535 extern int compat_ptrace_request(struct task_struct *child,
536 compat_long_t request,
537 compat_ulong_t addr, compat_ulong_t data);
538
539 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
540 compat_ulong_t addr, compat_ulong_t data);
541
542 struct epoll_event; /* fortunately, this one is fixed-layout */
543
544 int compat_restore_altstack(const compat_stack_t __user *uss);
545 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
546 #define unsafe_compat_save_altstack(uss, sp, label) do { \
547 compat_stack_t __user *__uss = uss; \
548 struct task_struct *t = current; \
549 unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
550 &__uss->ss_sp, label); \
551 unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
552 unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
553 } while (0);
554
555 /*
556 * These syscall function prototypes are kept in the same order as
557 * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
558 * go below.
559 *
560 * Please note that these prototypes here are only provided for information
561 * purposes, for static analysis, and for linking from the syscall table.
562 * These functions should not be called elsewhere from kernel code.
563 *
564 * As the syscall calling convention may be different from the default
565 * for architectures overriding the syscall calling convention, do not
566 * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
567 */
568 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
569 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
570 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
571 u32 __user *iocb);
572 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
573 compat_long_t min_nr,
574 compat_long_t nr,
575 struct io_event __user *events,
576 struct old_timespec32 __user *timeout,
577 const struct __compat_aio_sigset __user *usig);
578 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
579 compat_long_t min_nr,
580 compat_long_t nr,
581 struct io_event __user *events,
582 struct __kernel_timespec __user *timeout,
583 const struct __compat_aio_sigset __user *usig);
584 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
585 asmlinkage long compat_sys_epoll_pwait(int epfd,
586 struct epoll_event __user *events,
587 int maxevents, int timeout,
588 const compat_sigset_t __user *sigmask,
589 compat_size_t sigsetsize);
590 asmlinkage long compat_sys_epoll_pwait2(int epfd,
591 struct epoll_event __user *events,
592 int maxevents,
593 const struct __kernel_timespec __user *timeout,
594 const compat_sigset_t __user *sigmask,
595 compat_size_t sigsetsize);
596 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
597 compat_ulong_t arg);
598 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
599 compat_ulong_t arg);
600 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
601 compat_ulong_t arg);
602 asmlinkage long compat_sys_statfs(const char __user *pathname,
603 struct compat_statfs __user *buf);
604 asmlinkage long compat_sys_statfs64(const char __user *pathname,
605 compat_size_t sz,
606 struct compat_statfs64 __user *buf);
607 asmlinkage long compat_sys_fstatfs(unsigned int fd,
608 struct compat_statfs __user *buf);
609 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
610 struct compat_statfs64 __user *buf);
611 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
612 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
613 /* No generic prototype for truncate64, ftruncate64, fallocate */
614 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
615 int flags, umode_t mode);
616 asmlinkage long compat_sys_getdents(unsigned int fd,
617 struct compat_linux_dirent __user *dirent,
618 unsigned int count);
619 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
620 /* No generic prototype for pread64 and pwrite64 */
621 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
622 const struct iovec __user *vec,
623 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
624 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
625 const struct iovec __user *vec,
626 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
627 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
628 asmlinkage long compat_sys_preadv64(unsigned long fd,
629 const struct iovec __user *vec,
630 unsigned long vlen, loff_t pos);
631 #endif
632
633 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
634 asmlinkage long compat_sys_pwritev64(unsigned long fd,
635 const struct iovec __user *vec,
636 unsigned long vlen, loff_t pos);
637 #endif
638 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
639 compat_off_t __user *offset, compat_size_t count);
640 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
641 compat_loff_t __user *offset, compat_size_t count);
642 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
643 compat_ulong_t __user *outp,
644 compat_ulong_t __user *exp,
645 struct old_timespec32 __user *tsp,
646 void __user *sig);
647 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
648 compat_ulong_t __user *outp,
649 compat_ulong_t __user *exp,
650 struct __kernel_timespec __user *tsp,
651 void __user *sig);
652 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
653 unsigned int nfds,
654 struct old_timespec32 __user *tsp,
655 const compat_sigset_t __user *sigmask,
656 compat_size_t sigsetsize);
657 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
658 unsigned int nfds,
659 struct __kernel_timespec __user *tsp,
660 const compat_sigset_t __user *sigmask,
661 compat_size_t sigsetsize);
662 asmlinkage long compat_sys_signalfd4(int ufd,
663 const compat_sigset_t __user *sigmask,
664 compat_size_t sigsetsize, int flags);
665 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
666 const char __user *filename,
667 struct compat_stat __user *statbuf,
668 int flag);
669 asmlinkage long compat_sys_newfstat(unsigned int fd,
670 struct compat_stat __user *statbuf);
671 /* No generic prototype for sync_file_range and sync_file_range2 */
672 asmlinkage long compat_sys_waitid(int, compat_pid_t,
673 struct compat_siginfo __user *, int,
674 struct compat_rusage __user *);
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 asmlinkage long compat_sys_getitimer(int which,
682 struct old_itimerval32 __user *it);
683 asmlinkage long compat_sys_setitimer(int which,
684 struct old_itimerval32 __user *in,
685 struct old_itimerval32 __user *out);
686 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
687 compat_ulong_t nr_segments,
688 struct compat_kexec_segment __user *,
689 compat_ulong_t flags);
690 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
691 struct compat_sigevent __user *timer_event_spec,
692 timer_t __user *created_timer_id);
693 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
694 compat_long_t addr, compat_long_t data);
695 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
696 unsigned int len,
697 compat_ulong_t __user *user_mask_ptr);
698 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
699 unsigned int len,
700 compat_ulong_t __user *user_mask_ptr);
701 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
702 compat_stack_t __user *uoss_ptr);
703 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
704 compat_size_t sigsetsize);
705 #ifndef CONFIG_ODD_RT_SIGACTION
706 asmlinkage long compat_sys_rt_sigaction(int,
707 const struct compat_sigaction __user *,
708 struct compat_sigaction __user *,
709 compat_size_t);
710 #endif
711 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
712 compat_sigset_t __user *oset,
713 compat_size_t sigsetsize);
714 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
715 compat_size_t sigsetsize);
716 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
717 struct compat_siginfo __user *uinfo,
718 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
719 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
720 struct compat_siginfo __user *uinfo,
721 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
722 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
723 struct compat_siginfo __user *uinfo);
724 /* No generic prototype for rt_sigreturn */
725 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
726 asmlinkage long compat_sys_getrlimit(unsigned int resource,
727 struct compat_rlimit __user *rlim);
728 asmlinkage long compat_sys_setrlimit(unsigned int resource,
729 struct compat_rlimit __user *rlim);
730 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
731 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
732 struct timezone __user *tz);
733 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
734 struct timezone __user *tz);
735 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
736 asmlinkage long compat_sys_mq_open(const char __user *u_name,
737 int oflag, compat_mode_t mode,
738 struct compat_mq_attr __user *u_attr);
739 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
740 const struct compat_sigevent __user *u_notification);
741 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
742 const struct compat_mq_attr __user *u_mqstat,
743 struct compat_mq_attr __user *u_omqstat);
744 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
745 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
746 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
747 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
748 compat_ssize_t msgsz, int msgflg);
749 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
750 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
751 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
752 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
753 unsigned flags, struct sockaddr __user *addr,
754 int __user *addrlen);
755 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
756 unsigned flags);
757 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
758 unsigned int flags);
759 /* No generic prototype for readahead */
760 asmlinkage long compat_sys_keyctl(u32 option,
761 u32 arg2, u32 arg3, u32 arg4, u32 arg5);
762 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
763 const compat_uptr_t __user *envp);
764 /* No generic prototype for fadvise64_64 */
765 /* CONFIG_MMU only */
766 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
767 compat_pid_t pid, int sig,
768 struct compat_siginfo __user *uinfo);
769 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
770 unsigned vlen, unsigned int flags,
771 struct __kernel_timespec __user *timeout);
772 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
773 unsigned vlen, unsigned int flags,
774 struct old_timespec32 __user *timeout);
775 asmlinkage long compat_sys_wait4(compat_pid_t pid,
776 compat_uint_t __user *stat_addr, int options,
777 struct compat_rusage __user *ru);
778 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
779 int, const char __user *);
780 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
781 struct file_handle __user *handle,
782 int flags);
783 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
784 unsigned vlen, unsigned int flags);
785 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
786 const compat_uptr_t __user *argv,
787 const compat_uptr_t __user *envp, int flags);
788 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
789 const struct iovec __user *vec,
790 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
791 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
792 const struct iovec __user *vec,
793 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
794 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
795 asmlinkage long compat_sys_preadv64v2(unsigned long fd,
796 const struct iovec __user *vec,
797 unsigned long vlen, loff_t pos, rwf_t flags);
798 #endif
799
800 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
801 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
802 const struct iovec __user *vec,
803 unsigned long vlen, loff_t pos, rwf_t flags);
804 #endif
805
806
807 /*
808 * Deprecated system calls which are still defined in
809 * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
810 */
811
812 /* __ARCH_WANT_SYSCALL_NO_AT */
813 asmlinkage long compat_sys_open(const char __user *filename, int flags,
814 umode_t mode);
815
816 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
817 asmlinkage long compat_sys_signalfd(int ufd,
818 const compat_sigset_t __user *sigmask,
819 compat_size_t sigsetsize);
820
821 /* __ARCH_WANT_SYSCALL_OFF_T */
822 asmlinkage long compat_sys_newstat(const char __user *filename,
823 struct compat_stat __user *statbuf);
824 asmlinkage long compat_sys_newlstat(const char __user *filename,
825 struct compat_stat __user *statbuf);
826
827 /* __ARCH_WANT_SYSCALL_DEPRECATED */
828 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
829 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
830 struct old_timeval32 __user *tvp);
831 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
832 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
833 unsigned flags);
834
835 /* obsolete */
836 asmlinkage long compat_sys_old_readdir(unsigned int fd,
837 struct compat_old_linux_dirent __user *,
838 unsigned int count);
839
840 /* obsolete */
841 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
842
843 /* obsolete */
844 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
845
846 /* obsolete */
847 #ifdef __ARCH_WANT_SYS_SIGPENDING
848 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
849 #endif
850
851 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
852 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
853 compat_old_sigset_t __user *oset);
854 #endif
855 #ifdef CONFIG_COMPAT_OLD_SIGACTION
856 asmlinkage long compat_sys_sigaction(int sig,
857 const struct compat_old_sigaction __user *act,
858 struct compat_old_sigaction __user *oact);
859 #endif
860
861 /* obsolete */
862 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
863
864 #ifdef __ARCH_WANT_COMPAT_TRUNCATE64
865 asmlinkage long compat_sys_truncate64(const char __user *pathname, compat_arg_u64(len));
866 #endif
867
868 #ifdef __ARCH_WANT_COMPAT_FTRUNCATE64
869 asmlinkage long compat_sys_ftruncate64(unsigned int fd, compat_arg_u64(len));
870 #endif
871
872 #ifdef __ARCH_WANT_COMPAT_FALLOCATE
873 asmlinkage long compat_sys_fallocate(int fd, int mode, compat_arg_u64(offset),
874 compat_arg_u64(len));
875 #endif
876
877 #ifdef __ARCH_WANT_COMPAT_PREAD64
878 asmlinkage long compat_sys_pread64(unsigned int fd, char __user *buf, size_t count,
879 compat_arg_u64(pos));
880 #endif
881
882 #ifdef __ARCH_WANT_COMPAT_PWRITE64
883 asmlinkage long compat_sys_pwrite64(unsigned int fd, const char __user *buf, size_t count,
884 compat_arg_u64(pos));
885 #endif
886
887 #ifdef __ARCH_WANT_COMPAT_SYNC_FILE_RANGE
888 asmlinkage long compat_sys_sync_file_range(int fd, compat_arg_u64(pos),
889 compat_arg_u64(nbytes), unsigned int flags);
890 #endif
891
892 #ifdef __ARCH_WANT_COMPAT_FADVISE64_64
893 asmlinkage long compat_sys_fadvise64_64(int fd, compat_arg_u64(pos),
894 compat_arg_u64(len), int advice);
895 #endif
896
897 #ifdef __ARCH_WANT_COMPAT_READAHEAD
898 asmlinkage long compat_sys_readahead(int fd, compat_arg_u64(offset), size_t count);
899 #endif
900
901 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
902
903 /**
904 * ns_to_old_timeval32 - Compat version of ns_to_timeval
905 * @nsec: the nanoseconds value to be converted
906 *
907 * Returns the old_timeval32 representation of the nsec parameter.
908 */
ns_to_old_timeval32(s64 nsec)909 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
910 {
911 struct __kernel_old_timeval tv;
912 struct old_timeval32 ctv;
913
914 tv = ns_to_kernel_old_timeval(nsec);
915 ctv.tv_sec = tv.tv_sec;
916 ctv.tv_usec = tv.tv_usec;
917
918 return ctv;
919 }
920
921 /*
922 * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
923 * directly. Instead, use one of the functions which work equivalently, such
924 * as the kcompat_sys_xyzyyz() functions prototyped below.
925 */
926
927 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
928 struct compat_statfs64 __user * buf);
929 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
930 struct compat_statfs64 __user * buf);
931
932 #ifdef CONFIG_COMPAT
933
934 /*
935 * For most but not all architectures, "am I in a compat syscall?" and
936 * "am I a compat task?" are the same question. For architectures on which
937 * they aren't the same question, arch code can override in_compat_syscall.
938 */
939 #ifndef in_compat_syscall
in_compat_syscall(void)940 static inline bool in_compat_syscall(void) { return is_compat_task(); }
941 #endif
942
943 #else /* !CONFIG_COMPAT */
944
945 #define is_compat_task() (0)
946 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
947 #define in_compat_syscall in_compat_syscall
in_compat_syscall(void)948 static inline bool in_compat_syscall(void) { return false; }
949
950 #endif /* CONFIG_COMPAT */
951
952 #define BITS_PER_COMPAT_LONG (8*sizeof(compat_long_t))
953
954 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
955
956 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
957 unsigned long bitmap_size);
958 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
959 unsigned long bitmap_size);
960
961 /*
962 * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
963 * types, and will need special compat treatment for that. Most architectures
964 * don't need that special handling even for compat syscalls.
965 */
966 #ifndef compat_need_64bit_alignment_fixup
967 #define compat_need_64bit_alignment_fixup() false
968 #endif
969
970 /*
971 * A pointer passed in from user mode. This should not
972 * be used for syscall parameters, just declare them
973 * as pointers because the syscall entry code will have
974 * appropriately converted them already.
975 */
976 #ifndef compat_ptr
compat_ptr(compat_uptr_t uptr)977 static inline void __user *compat_ptr(compat_uptr_t uptr)
978 {
979 return (void __user *)(unsigned long)uptr;
980 }
981 #endif
982
ptr_to_compat(void __user * uptr)983 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
984 {
985 return (u32)(unsigned long)uptr;
986 }
987
988 #endif /* _LINUX_COMPAT_H */
989