f1ef24c68fcc6578fd56e3b12ba7ee243d6fae9e
[sfrench/cifs-2.6.git] / include / linux / compat.h
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
24 #ifdef CONFIG_COMPAT
25 #include <asm/siginfo.h>
26 #include <asm/signal.h>
27 #endif
28
29 #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
30 /*
31  * It may be useful for an architecture to override the definitions of the
32  * COMPAT_SYSCALL_DEFINE0 and COMPAT_SYSCALL_DEFINEx() macros, in particular
33  * to use a different calling convention for syscalls. To allow for that,
34  + the prototypes for the compat_sys_*() functions below will *not* be included
35  * if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
36  */
37 #include <asm/syscall_wrapper.h>
38 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
39
40 #ifndef COMPAT_USE_64BIT_TIME
41 #define COMPAT_USE_64BIT_TIME 0
42 #endif
43
44 #ifndef __SC_DELOUSE
45 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
46 #endif
47
48 #ifndef COMPAT_SYSCALL_DEFINE0
49 #define COMPAT_SYSCALL_DEFINE0(name) \
50         asmlinkage long compat_sys_##name(void); \
51         ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
52         asmlinkage long compat_sys_##name(void)
53 #endif /* COMPAT_SYSCALL_DEFINE0 */
54
55 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
56         COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
57 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
58         COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
59 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
60         COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
61 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
62         COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
63 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
64         COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
65 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
66         COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
67
68 /*
69  * The asmlinkage stub is aliased to a function named __se_compat_sys_*() which
70  * sign-extends 32-bit ints to longs whenever needed. The actual work is
71  * done within __do_compat_sys_*().
72  */
73 #ifndef COMPAT_SYSCALL_DEFINEx
74 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)                                    \
75         __diag_push();                                                          \
76         __diag_ignore(GCC, 8, "-Wattribute-alias",                              \
77                       "Type aliasing is used to sanitize syscall arguments");\
78         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));       \
79         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))        \
80                 __attribute__((alias(__stringify(__se_compat_sys##name))));     \
81         ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO);                         \
82         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
83         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));  \
84         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))   \
85         {                                                                       \
86                 long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
87                 __MAP(x,__SC_TEST,__VA_ARGS__);                                 \
88                 return ret;                                                     \
89         }                                                                       \
90         __diag_pop();                                                           \
91         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
92 #endif /* COMPAT_SYSCALL_DEFINEx */
93
94 #ifdef CONFIG_COMPAT
95
96 #ifndef compat_user_stack_pointer
97 #define compat_user_stack_pointer() current_user_stack_pointer()
98 #endif
99 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
100 typedef struct compat_sigaltstack {
101         compat_uptr_t                   ss_sp;
102         int                             ss_flags;
103         compat_size_t                   ss_size;
104 } compat_stack_t;
105 #endif
106 #ifndef COMPAT_MINSIGSTKSZ
107 #define COMPAT_MINSIGSTKSZ      MINSIGSTKSZ
108 #endif
109
110 #define compat_jiffies_to_clock_t(x)    \
111                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
112
113 typedef __compat_uid32_t        compat_uid_t;
114 typedef __compat_gid32_t        compat_gid_t;
115
116 struct compat_sel_arg_struct;
117 struct rusage;
118
119 struct compat_itimerval {
120         struct old_timeval32    it_interval;
121         struct old_timeval32    it_value;
122 };
123
124 struct itimerval;
125 int get_compat_itimerval(struct itimerval *, const struct compat_itimerval __user *);
126 int put_compat_itimerval(struct compat_itimerval __user *, const struct itimerval *);
127
128 struct compat_tms {
129         compat_clock_t          tms_utime;
130         compat_clock_t          tms_stime;
131         compat_clock_t          tms_cutime;
132         compat_clock_t          tms_cstime;
133 };
134
135 struct compat_timex {
136         compat_uint_t modes;
137         compat_long_t offset;
138         compat_long_t freq;
139         compat_long_t maxerror;
140         compat_long_t esterror;
141         compat_int_t status;
142         compat_long_t constant;
143         compat_long_t precision;
144         compat_long_t tolerance;
145         struct old_timeval32 time;
146         compat_long_t tick;
147         compat_long_t ppsfreq;
148         compat_long_t jitter;
149         compat_int_t shift;
150         compat_long_t stabil;
151         compat_long_t jitcnt;
152         compat_long_t calcnt;
153         compat_long_t errcnt;
154         compat_long_t stbcnt;
155         compat_int_t tai;
156
157         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
158         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
159         compat_int_t:32; compat_int_t:32; compat_int_t:32;
160 };
161
162 struct timex;
163 int compat_get_timex(struct timex *, const struct compat_timex __user *);
164 int compat_put_timex(struct compat_timex __user *, const struct timex *);
165
166 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
167
168 typedef struct {
169         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
170 } compat_sigset_t;
171
172 struct compat_sigaction {
173 #ifndef __ARCH_HAS_IRIX_SIGACTION
174         compat_uptr_t                   sa_handler;
175         compat_ulong_t                  sa_flags;
176 #else
177         compat_uint_t                   sa_flags;
178         compat_uptr_t                   sa_handler;
179 #endif
180 #ifdef __ARCH_HAS_SA_RESTORER
181         compat_uptr_t                   sa_restorer;
182 #endif
183         compat_sigset_t                 sa_mask __packed;
184 };
185
186 typedef union compat_sigval {
187         compat_int_t    sival_int;
188         compat_uptr_t   sival_ptr;
189 } compat_sigval_t;
190
191 typedef struct compat_siginfo {
192         int si_signo;
193 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
194         int si_errno;
195         int si_code;
196 #else
197         int si_code;
198         int si_errno;
199 #endif
200
201         union {
202                 int _pad[128/sizeof(int) - 3];
203
204                 /* kill() */
205                 struct {
206                         compat_pid_t _pid;      /* sender's pid */
207                         __compat_uid32_t _uid;  /* sender's uid */
208                 } _kill;
209
210                 /* POSIX.1b timers */
211                 struct {
212                         compat_timer_t _tid;    /* timer id */
213                         int _overrun;           /* overrun count */
214                         compat_sigval_t _sigval;        /* same as below */
215                 } _timer;
216
217                 /* POSIX.1b signals */
218                 struct {
219                         compat_pid_t _pid;      /* sender's pid */
220                         __compat_uid32_t _uid;  /* sender's uid */
221                         compat_sigval_t _sigval;
222                 } _rt;
223
224                 /* SIGCHLD */
225                 struct {
226                         compat_pid_t _pid;      /* which child */
227                         __compat_uid32_t _uid;  /* sender's uid */
228                         int _status;            /* exit code */
229                         compat_clock_t _utime;
230                         compat_clock_t _stime;
231                 } _sigchld;
232
233 #ifdef CONFIG_X86_X32_ABI
234                 /* SIGCHLD (x32 version) */
235                 struct {
236                         compat_pid_t _pid;      /* which child */
237                         __compat_uid32_t _uid;  /* sender's uid */
238                         int _status;            /* exit code */
239                         compat_s64 _utime;
240                         compat_s64 _stime;
241                 } _sigchld_x32;
242 #endif
243
244                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
245                 struct {
246                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
247 #ifdef __ARCH_SI_TRAPNO
248                         int _trapno;    /* TRAP # which caused the signal */
249 #endif
250 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
251                                      sizeof(short) : __alignof__(compat_uptr_t))
252                         union {
253                                 /*
254                                  * used when si_code=BUS_MCEERR_AR or
255                                  * used when si_code=BUS_MCEERR_AO
256                                  */
257                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
258                                 /* used when si_code=SEGV_BNDERR */
259                                 struct {
260                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
261                                         compat_uptr_t _lower;
262                                         compat_uptr_t _upper;
263                                 } _addr_bnd;
264                                 /* used when si_code=SEGV_PKUERR */
265                                 struct {
266                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
267                                         u32 _pkey;
268                                 } _addr_pkey;
269                         };
270                 } _sigfault;
271
272                 /* SIGPOLL */
273                 struct {
274                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
275                         int _fd;
276                 } _sigpoll;
277
278                 struct {
279                         compat_uptr_t _call_addr; /* calling user insn */
280                         int _syscall;   /* triggering system call number */
281                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
282                 } _sigsys;
283         } _sifields;
284 } compat_siginfo_t;
285
286 /*
287  * These functions operate on 32- or 64-bit specs depending on
288  * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments.
289  */
290 extern int compat_get_timespec(struct timespec *, const void __user *);
291 extern int compat_put_timespec(const struct timespec *, void __user *);
292 extern int compat_get_timeval(struct timeval *, const void __user *);
293 extern int compat_put_timeval(const struct timeval *, void __user *);
294
295 struct compat_iovec {
296         compat_uptr_t   iov_base;
297         compat_size_t   iov_len;
298 };
299
300 struct compat_rlimit {
301         compat_ulong_t  rlim_cur;
302         compat_ulong_t  rlim_max;
303 };
304
305 struct compat_rusage {
306         struct old_timeval32 ru_utime;
307         struct old_timeval32 ru_stime;
308         compat_long_t   ru_maxrss;
309         compat_long_t   ru_ixrss;
310         compat_long_t   ru_idrss;
311         compat_long_t   ru_isrss;
312         compat_long_t   ru_minflt;
313         compat_long_t   ru_majflt;
314         compat_long_t   ru_nswap;
315         compat_long_t   ru_inblock;
316         compat_long_t   ru_oublock;
317         compat_long_t   ru_msgsnd;
318         compat_long_t   ru_msgrcv;
319         compat_long_t   ru_nsignals;
320         compat_long_t   ru_nvcsw;
321         compat_long_t   ru_nivcsw;
322 };
323
324 extern int put_compat_rusage(const struct rusage *,
325                              struct compat_rusage __user *);
326
327 struct compat_siginfo;
328 struct __compat_aio_sigset;
329
330 struct compat_dirent {
331         u32             d_ino;
332         compat_off_t    d_off;
333         u16             d_reclen;
334         char            d_name[256];
335 };
336
337 struct compat_ustat {
338         compat_daddr_t          f_tfree;
339         compat_ino_t            f_tinode;
340         char                    f_fname[6];
341         char                    f_fpack[6];
342 };
343
344 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
345
346 typedef struct compat_sigevent {
347         compat_sigval_t sigev_value;
348         compat_int_t sigev_signo;
349         compat_int_t sigev_notify;
350         union {
351                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
352                 compat_int_t _tid;
353
354                 struct {
355                         compat_uptr_t _function;
356                         compat_uptr_t _attribute;
357                 } _sigev_thread;
358         } _sigev_un;
359 } compat_sigevent_t;
360
361 struct compat_ifmap {
362         compat_ulong_t mem_start;
363         compat_ulong_t mem_end;
364         unsigned short base_addr;
365         unsigned char irq;
366         unsigned char dma;
367         unsigned char port;
368 };
369
370 struct compat_if_settings {
371         unsigned int type;      /* Type of physical device or protocol */
372         unsigned int size;      /* Size of the data allocated by the caller */
373         compat_uptr_t ifs_ifsu; /* union of pointers */
374 };
375
376 struct compat_ifreq {
377         union {
378                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
379         } ifr_ifrn;
380         union {
381                 struct  sockaddr ifru_addr;
382                 struct  sockaddr ifru_dstaddr;
383                 struct  sockaddr ifru_broadaddr;
384                 struct  sockaddr ifru_netmask;
385                 struct  sockaddr ifru_hwaddr;
386                 short   ifru_flags;
387                 compat_int_t    ifru_ivalue;
388                 compat_int_t    ifru_mtu;
389                 struct  compat_ifmap ifru_map;
390                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
391                 char    ifru_newname[IFNAMSIZ];
392                 compat_caddr_t  ifru_data;
393                 struct  compat_if_settings ifru_settings;
394         } ifr_ifru;
395 };
396
397 struct compat_ifconf {
398         compat_int_t    ifc_len;                /* size of buffer */
399         compat_caddr_t  ifcbuf;
400 };
401
402 struct compat_robust_list {
403         compat_uptr_t                   next;
404 };
405
406 struct compat_robust_list_head {
407         struct compat_robust_list       list;
408         compat_long_t                   futex_offset;
409         compat_uptr_t                   list_op_pending;
410 };
411
412 #ifdef CONFIG_COMPAT_OLD_SIGACTION
413 struct compat_old_sigaction {
414         compat_uptr_t                   sa_handler;
415         compat_old_sigset_t             sa_mask;
416         compat_ulong_t                  sa_flags;
417         compat_uptr_t                   sa_restorer;
418 };
419 #endif
420
421 struct compat_keyctl_kdf_params {
422         compat_uptr_t hashname;
423         compat_uptr_t otherinfo;
424         __u32 otherinfolen;
425         __u32 __spare[8];
426 };
427
428 struct compat_statfs;
429 struct compat_statfs64;
430 struct compat_old_linux_dirent;
431 struct compat_linux_dirent;
432 struct linux_dirent64;
433 struct compat_msghdr;
434 struct compat_mmsghdr;
435 struct compat_sysinfo;
436 struct compat_sysctl_args;
437 struct compat_kexec_segment;
438 struct compat_mq_attr;
439 struct compat_msgbuf;
440
441 extern void compat_exit_robust_list(struct task_struct *curr);
442
443 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
444
445 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
446
447 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
448                        unsigned long bitmap_size);
449 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
450                        unsigned long bitmap_size);
451 int copy_siginfo_from_user32(kernel_siginfo_t *to, const struct compat_siginfo __user *from);
452 int copy_siginfo_to_user32(struct compat_siginfo __user *to, const kernel_siginfo_t *from);
453 int get_compat_sigevent(struct sigevent *event,
454                 const struct compat_sigevent __user *u_event);
455
456 static inline int old_timeval32_compare(struct old_timeval32 *lhs,
457                                         struct old_timeval32 *rhs)
458 {
459         if (lhs->tv_sec < rhs->tv_sec)
460                 return -1;
461         if (lhs->tv_sec > rhs->tv_sec)
462                 return 1;
463         return lhs->tv_usec - rhs->tv_usec;
464 }
465
466 static inline int old_timespec32_compare(struct old_timespec32 *lhs,
467                                         struct old_timespec32 *rhs)
468 {
469         if (lhs->tv_sec < rhs->tv_sec)
470                 return -1;
471         if (lhs->tv_sec > rhs->tv_sec)
472                 return 1;
473         return lhs->tv_nsec - rhs->tv_nsec;
474 }
475
476 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
477
478 /*
479  * Defined inline such that size can be compile time constant, which avoids
480  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
481  */
482 static inline int
483 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
484                   unsigned int size)
485 {
486         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
487 #ifdef __BIG_ENDIAN
488         compat_sigset_t v;
489         switch (_NSIG_WORDS) {
490         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
491         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
492         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
493         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
494         }
495         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
496 #else
497         return copy_to_user(compat, set, size) ? -EFAULT : 0;
498 #endif
499 }
500
501 extern int compat_ptrace_request(struct task_struct *child,
502                                  compat_long_t request,
503                                  compat_ulong_t addr, compat_ulong_t data);
504
505 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
506                                compat_ulong_t addr, compat_ulong_t data);
507
508 struct epoll_event;     /* fortunately, this one is fixed-layout */
509
510 extern ssize_t compat_rw_copy_check_uvector(int type,
511                 const struct compat_iovec __user *uvector,
512                 unsigned long nr_segs,
513                 unsigned long fast_segs, struct iovec *fast_pointer,
514                 struct iovec **ret_pointer);
515
516 extern void __user *compat_alloc_user_space(unsigned long len);
517
518 int compat_restore_altstack(const compat_stack_t __user *uss);
519 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
520 #define compat_save_altstack_ex(uss, sp) do { \
521         compat_stack_t __user *__uss = uss; \
522         struct task_struct *t = current; \
523         put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
524         put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
525         put_user_ex(t->sas_ss_size, &__uss->ss_size); \
526         if (t->sas_ss_flags & SS_AUTODISARM) \
527                 sas_ss_reset(t); \
528 } while (0);
529
530 /*
531  * These syscall function prototypes are kept in the same order as
532  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
533  * go below.
534  *
535  * Please note that these prototypes here are only provided for information
536  * purposes, for static analysis, and for linking from the syscall table.
537  * These functions should not be called elsewhere from kernel code.
538  *
539  * As the syscall calling convention may be different from the default
540  * for architectures overriding the syscall calling convention, do not
541  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
542  */
543 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
544 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
545 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
546                                      u32 __user *iocb);
547 asmlinkage long compat_sys_io_getevents(compat_aio_context_t ctx_id,
548                                         compat_long_t min_nr,
549                                         compat_long_t nr,
550                                         struct io_event __user *events,
551                                         struct old_timespec32 __user *timeout);
552 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
553                                         compat_long_t min_nr,
554                                         compat_long_t nr,
555                                         struct io_event __user *events,
556                                         struct old_timespec32 __user *timeout,
557                                         const struct __compat_aio_sigset __user *usig);
558
559 /* fs/cookies.c */
560 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
561
562 /* fs/eventpoll.c */
563 asmlinkage long compat_sys_epoll_pwait(int epfd,
564                         struct epoll_event __user *events,
565                         int maxevents, int timeout,
566                         const compat_sigset_t __user *sigmask,
567                         compat_size_t sigsetsize);
568
569 /* fs/fcntl.c */
570 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
571                                  compat_ulong_t arg);
572 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
573                                    compat_ulong_t arg);
574
575 /* fs/ioctl.c */
576 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
577                                  compat_ulong_t arg);
578
579 /* fs/namespace.c */
580 asmlinkage long compat_sys_mount(const char __user *dev_name,
581                                  const char __user *dir_name,
582                                  const char __user *type, compat_ulong_t flags,
583                                  const void __user *data);
584
585 /* fs/open.c */
586 asmlinkage long compat_sys_statfs(const char __user *pathname,
587                                   struct compat_statfs __user *buf);
588 asmlinkage long compat_sys_statfs64(const char __user *pathname,
589                                     compat_size_t sz,
590                                     struct compat_statfs64 __user *buf);
591 asmlinkage long compat_sys_fstatfs(unsigned int fd,
592                                    struct compat_statfs __user *buf);
593 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
594                                      struct compat_statfs64 __user *buf);
595 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
596 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
597 /* No generic prototype for truncate64, ftruncate64, fallocate */
598 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
599                                   int flags, umode_t mode);
600
601 /* fs/readdir.c */
602 asmlinkage long compat_sys_getdents(unsigned int fd,
603                                     struct compat_linux_dirent __user *dirent,
604                                     unsigned int count);
605
606 /* fs/read_write.c */
607 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
608 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
609                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
610 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
611                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
612 /* No generic prototype for pread64 and pwrite64 */
613 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
614                 const struct compat_iovec __user *vec,
615                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
616 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
617                 const struct compat_iovec __user *vec,
618                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
619 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
620 asmlinkage long compat_sys_preadv64(unsigned long fd,
621                 const struct compat_iovec __user *vec,
622                 unsigned long vlen, loff_t pos);
623 #endif
624
625 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
626 asmlinkage long compat_sys_pwritev64(unsigned long fd,
627                 const struct compat_iovec __user *vec,
628                 unsigned long vlen, loff_t pos);
629 #endif
630
631 /* fs/sendfile.c */
632 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
633                                     compat_off_t __user *offset, compat_size_t count);
634 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
635                                     compat_loff_t __user *offset, compat_size_t count);
636
637 /* fs/select.c */
638 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
639                                     compat_ulong_t __user *outp,
640                                     compat_ulong_t __user *exp,
641                                     struct old_timespec32 __user *tsp,
642                                     void __user *sig);
643 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
644                                  unsigned int nfds,
645                                  struct old_timespec32 __user *tsp,
646                                  const compat_sigset_t __user *sigmask,
647                                  compat_size_t sigsetsize);
648
649 /* fs/signalfd.c */
650 asmlinkage long compat_sys_signalfd4(int ufd,
651                                      const compat_sigset_t __user *sigmask,
652                                      compat_size_t sigsetsize, int flags);
653
654 /* fs/splice.c */
655 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
656                                     unsigned int nr_segs, unsigned int flags);
657
658 /* fs/stat.c */
659 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
660                                       const char __user *filename,
661                                       struct compat_stat __user *statbuf,
662                                       int flag);
663 asmlinkage long compat_sys_newfstat(unsigned int fd,
664                                     struct compat_stat __user *statbuf);
665
666 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
667
668 /* fs/timerfd.c */
669 asmlinkage long compat_sys_timerfd_gettime(int ufd,
670                                    struct old_itimerspec32 __user *otmr);
671 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
672                                    const struct old_itimerspec32 __user *utmr,
673                                    struct old_itimerspec32 __user *otmr);
674
675 /* fs/utimes.c */
676 asmlinkage long compat_sys_utimensat(unsigned int dfd,
677                                      const char __user *filename,
678                                      struct old_timespec32 __user *t,
679                                      int flags);
680
681 /* kernel/exit.c */
682 asmlinkage long compat_sys_waitid(int, compat_pid_t,
683                 struct compat_siginfo __user *, int,
684                 struct compat_rusage __user *);
685
686
687
688 /* kernel/futex.c */
689 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
690                 struct old_timespec32 __user *utime, u32 __user *uaddr2,
691                 u32 val3);
692 asmlinkage long
693 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
694                            compat_size_t len);
695 asmlinkage long
696 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
697                            compat_size_t __user *len_ptr);
698
699 /* kernel/hrtimer.c */
700 asmlinkage long compat_sys_nanosleep(struct old_timespec32 __user *rqtp,
701                                      struct old_timespec32 __user *rmtp);
702
703 /* kernel/itimer.c */
704 asmlinkage long compat_sys_getitimer(int which,
705                                      struct compat_itimerval __user *it);
706 asmlinkage long compat_sys_setitimer(int which,
707                                      struct compat_itimerval __user *in,
708                                      struct compat_itimerval __user *out);
709
710 /* kernel/kexec.c */
711 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
712                                       compat_ulong_t nr_segments,
713                                       struct compat_kexec_segment __user *,
714                                       compat_ulong_t flags);
715
716 /* kernel/posix-timers.c */
717 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
718                         struct compat_sigevent __user *timer_event_spec,
719                         timer_t __user *created_timer_id);
720 asmlinkage long compat_sys_timer_gettime(timer_t timer_id,
721                                  struct old_itimerspec32 __user *setting);
722 asmlinkage long compat_sys_timer_settime(timer_t timer_id, int flags,
723                                          struct old_itimerspec32 __user *new,
724                                          struct old_itimerspec32 __user *old);
725 asmlinkage long compat_sys_clock_settime(clockid_t which_clock,
726                                          struct old_timespec32 __user *tp);
727 asmlinkage long compat_sys_clock_gettime(clockid_t which_clock,
728                                          struct old_timespec32 __user *tp);
729 asmlinkage long compat_sys_clock_getres(clockid_t which_clock,
730                                         struct old_timespec32 __user *tp);
731 asmlinkage long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
732                                            struct old_timespec32 __user *rqtp,
733                                            struct old_timespec32 __user *rmtp);
734
735 /* kernel/ptrace.c */
736 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
737                                   compat_long_t addr, compat_long_t data);
738
739 /* kernel/sched/core.c */
740 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
741                                      unsigned int len,
742                                      compat_ulong_t __user *user_mask_ptr);
743 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
744                                      unsigned int len,
745                                      compat_ulong_t __user *user_mask_ptr);
746 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
747                                                  struct old_timespec32 __user *interval);
748
749 /* kernel/signal.c */
750 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
751                                        compat_stack_t __user *uoss_ptr);
752 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
753                                          compat_size_t sigsetsize);
754 #ifndef CONFIG_ODD_RT_SIGACTION
755 asmlinkage long compat_sys_rt_sigaction(int,
756                                  const struct compat_sigaction __user *,
757                                  struct compat_sigaction __user *,
758                                  compat_size_t);
759 #endif
760 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
761                                           compat_sigset_t __user *oset,
762                                           compat_size_t sigsetsize);
763 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
764                                          compat_size_t sigsetsize);
765 asmlinkage long compat_sys_rt_sigtimedwait(compat_sigset_t __user *uthese,
766                 struct compat_siginfo __user *uinfo,
767                 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
768 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
769                                 struct compat_siginfo __user *uinfo);
770 /* No generic prototype for rt_sigreturn */
771
772 /* kernel/sys.c */
773 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
774 asmlinkage long compat_sys_getrlimit(unsigned int resource,
775                                      struct compat_rlimit __user *rlim);
776 asmlinkage long compat_sys_setrlimit(unsigned int resource,
777                                      struct compat_rlimit __user *rlim);
778 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
779
780 /* kernel/time.c */
781 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
782                 struct timezone __user *tz);
783 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
784                 struct timezone __user *tz);
785 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
786
787 /* kernel/timer.c */
788 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
789
790 /* ipc/mqueue.c */
791 asmlinkage long compat_sys_mq_open(const char __user *u_name,
792                         int oflag, compat_mode_t mode,
793                         struct compat_mq_attr __user *u_attr);
794 asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
795                         const char __user *u_msg_ptr,
796                         compat_size_t msg_len, unsigned int msg_prio,
797                         const struct old_timespec32 __user *u_abs_timeout);
798 asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
799                         char __user *u_msg_ptr,
800                         compat_size_t msg_len, unsigned int __user *u_msg_prio,
801                         const struct old_timespec32 __user *u_abs_timeout);
802 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
803                         const struct compat_sigevent __user *u_notification);
804 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
805                         const struct compat_mq_attr __user *u_mqstat,
806                         struct compat_mq_attr __user *u_omqstat);
807
808 /* ipc/msg.c */
809 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
810 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
811                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
812 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
813                 compat_ssize_t msgsz, int msgflg);
814
815 /* ipc/sem.c */
816 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
817 asmlinkage long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
818                 unsigned nsems, const struct old_timespec32 __user *timeout);
819
820 /* ipc/shm.c */
821 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
822 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
823
824 /* net/socket.c */
825 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
826                             unsigned flags, struct sockaddr __user *addr,
827                             int __user *addrlen);
828 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
829                                       char __user *optval, unsigned int optlen);
830 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
831                                       char __user *optval, int __user *optlen);
832 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
833                                    unsigned flags);
834 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
835                                    unsigned int flags);
836
837 /* mm/filemap.c: No generic prototype for readahead */
838
839 /* security/keys/keyctl.c */
840 asmlinkage long compat_sys_keyctl(u32 option,
841                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
842
843 /* arch/example/kernel/sys_example.c */
844 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
845                      const compat_uptr_t __user *envp);
846
847 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
848
849 /* mm/, CONFIG_MMU only */
850 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
851                                  compat_ulong_t mode,
852                                  compat_ulong_t __user *nmask,
853                                  compat_ulong_t maxnode, compat_ulong_t flags);
854 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
855                                          compat_ulong_t __user *nmask,
856                                          compat_ulong_t maxnode,
857                                          compat_ulong_t addr,
858                                          compat_ulong_t flags);
859 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
860                                          compat_ulong_t maxnode);
861 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
862                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
863                 const compat_ulong_t __user *new_nodes);
864 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
865                                       __u32 __user *pages,
866                                       const int __user *nodes,
867                                       int __user *status,
868                                       int flags);
869
870 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
871                                         compat_pid_t pid, int sig,
872                                         struct compat_siginfo __user *uinfo);
873 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
874                                     unsigned vlen, unsigned int flags,
875                                     struct old_timespec32 __user *timeout);
876 asmlinkage long compat_sys_wait4(compat_pid_t pid,
877                                  compat_uint_t __user *stat_addr, int options,
878                                  struct compat_rusage __user *ru);
879 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
880                                             int, const char __user *);
881 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
882                                              struct file_handle __user *handle,
883                                              int flags);
884 asmlinkage long compat_sys_clock_adjtime(clockid_t which_clock,
885                                          struct compat_timex __user *tp);
886 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
887                                     unsigned vlen, unsigned int flags);
888 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
889                 const struct compat_iovec __user *lvec,
890                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
891                 compat_ulong_t riovcnt, compat_ulong_t flags);
892 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
893                 const struct compat_iovec __user *lvec,
894                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
895                 compat_ulong_t riovcnt, compat_ulong_t flags);
896 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
897                      const compat_uptr_t __user *argv,
898                      const compat_uptr_t __user *envp, int flags);
899 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
900                 const struct compat_iovec __user *vec,
901                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
902 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
903                 const struct compat_iovec __user *vec,
904                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
905 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
906 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
907                 const struct compat_iovec __user *vec,
908                 unsigned long vlen, loff_t pos, rwf_t flags);
909 #endif
910
911 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
912 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
913                 const struct compat_iovec __user *vec,
914                 unsigned long vlen, loff_t pos, rwf_t flags);
915 #endif
916
917
918 /*
919  * Deprecated system calls which are still defined in
920  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
921  */
922
923 /* __ARCH_WANT_SYSCALL_NO_AT */
924 asmlinkage long compat_sys_open(const char __user *filename, int flags,
925                                 umode_t mode);
926 asmlinkage long compat_sys_utimes(const char __user *filename,
927                                   struct old_timeval32 __user *t);
928
929 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
930 asmlinkage long compat_sys_signalfd(int ufd,
931                                     const compat_sigset_t __user *sigmask,
932                                     compat_size_t sigsetsize);
933
934 /* __ARCH_WANT_SYSCALL_OFF_T */
935 asmlinkage long compat_sys_newstat(const char __user *filename,
936                                    struct compat_stat __user *statbuf);
937 asmlinkage long compat_sys_newlstat(const char __user *filename,
938                                     struct compat_stat __user *statbuf);
939
940 /* __ARCH_WANT_SYSCALL_DEPRECATED */
941 asmlinkage long compat_sys_time(old_time32_t __user *tloc);
942 asmlinkage long compat_sys_utime(const char __user *filename,
943                                  struct old_utimbuf32 __user *t);
944 asmlinkage long compat_sys_futimesat(unsigned int dfd,
945                                      const char __user *filename,
946                                      struct old_timeval32 __user *t);
947 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
948                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
949                 struct old_timeval32 __user *tvp);
950 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
951 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
952                                 unsigned flags);
953 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
954
955 /* obsolete: fs/readdir.c */
956 asmlinkage long compat_sys_old_readdir(unsigned int fd,
957                                        struct compat_old_linux_dirent __user *,
958                                        unsigned int count);
959
960 /* obsolete: fs/select.c */
961 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
962
963 /* obsolete: ipc */
964 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
965
966 /* obsolete: kernel/signal.c */
967 #ifdef __ARCH_WANT_SYS_SIGPENDING
968 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
969 #endif
970
971 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
972 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
973                                        compat_old_sigset_t __user *oset);
974 #endif
975 #ifdef CONFIG_COMPAT_OLD_SIGACTION
976 asmlinkage long compat_sys_sigaction(int sig,
977                                    const struct compat_old_sigaction __user *act,
978                                    struct compat_old_sigaction __user *oact);
979 #endif
980
981 /* obsolete: kernel/time/time.c */
982 asmlinkage long compat_sys_stime(old_time32_t __user *tptr);
983
984 /* obsolete: net/socket.c */
985 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
986
987 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
988
989
990 /*
991  * For most but not all architectures, "am I in a compat syscall?" and
992  * "am I a compat task?" are the same question.  For architectures on which
993  * they aren't the same question, arch code can override in_compat_syscall.
994  */
995
996 #ifndef in_compat_syscall
997 static inline bool in_compat_syscall(void) { return is_compat_task(); }
998 #endif
999
1000 /**
1001  * ns_to_old_timeval32 - Compat version of ns_to_timeval
1002  * @nsec:       the nanoseconds value to be converted
1003  *
1004  * Returns the old_timeval32 representation of the nsec parameter.
1005  */
1006 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
1007 {
1008         struct timeval tv;
1009         struct old_timeval32 ctv;
1010
1011         tv = ns_to_timeval(nsec);
1012         ctv.tv_sec = tv.tv_sec;
1013         ctv.tv_usec = tv.tv_usec;
1014
1015         return ctv;
1016 }
1017
1018 /*
1019  * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
1020  * directly.  Instead, use one of the functions which work equivalently, such
1021  * as the kcompat_sys_xyzyyz() functions prototyped below.
1022  */
1023
1024 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
1025                      struct compat_statfs64 __user * buf);
1026 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
1027                           struct compat_statfs64 __user * buf);
1028
1029 #else /* !CONFIG_COMPAT */
1030
1031 #define is_compat_task() (0)
1032 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
1033 #define in_compat_syscall in_compat_syscall
1034 static inline bool in_compat_syscall(void) { return false; }
1035
1036 #endif /* CONFIG_COMPAT */
1037
1038 #endif /* _LINUX_COMPAT_H */