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