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
90struct 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 */
99typedef 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
112typedef __compat_uid32_t compat_uid_t;
113typedef __compat_gid32_t compat_gid_t;
114
115struct compat_sel_arg_struct;
116struct rusage;
117
118struct old_itimerval32;
119
120struct compat_tms {
121 compat_clock_t tms_utime;
122 compat_clock_t tms_stime;
123 compat_clock_t tms_cutime;
124 compat_clock_t tms_cstime;
125};
126
127#define _COMPAT_NSIG_WORDS (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
128
129#ifndef compat_sigset_t
130typedef struct {
131 compat_sigset_word sig[_COMPAT_NSIG_WORDS];
132} compat_sigset_t;
133#endif
134
135int set_compat_user_sigmask(const compat_sigset_t __user *umask,
136 size_t sigsetsize);
137
138struct compat_sigaction {
139#ifndef __ARCH_HAS_IRIX_SIGACTION
140 compat_uptr_t sa_handler;
141 compat_ulong_t sa_flags;
142#else
143 compat_uint_t sa_flags;
144 compat_uptr_t sa_handler;
145#endif
146#ifdef __ARCH_HAS_SA_RESTORER
147 compat_uptr_t sa_restorer;
148#endif
149 compat_sigset_t sa_mask __packed;
150};
151
152typedef union compat_sigval {
153 compat_int_t sival_int;
154 compat_uptr_t sival_ptr;
155} compat_sigval_t;
156
157typedef struct compat_siginfo {
158 int si_signo;
159#ifndef __ARCH_HAS_SWAPPED_SIGINFO
160 int si_errno;
161 int si_code;
162#else
163 int si_code;
164 int si_errno;
165#endif
166
167 union {
168 int _pad[128/sizeof(int) - 3];
169
170 /* kill() */
171 struct {
172 compat_pid_t _pid; /* sender's pid */
173 __compat_uid32_t _uid; /* sender's uid */
174 } _kill;
175
176 /* POSIX.1b timers */
177 struct {
178 compat_timer_t _tid; /* timer id */
179 int _overrun; /* overrun count */
180 compat_sigval_t _sigval; /* same as below */
181 } _timer;
182
183 /* POSIX.1b signals */
184 struct {
185 compat_pid_t _pid; /* sender's pid */
186 __compat_uid32_t _uid; /* sender's uid */
187 compat_sigval_t _sigval;
188 } _rt;
189
190 /* SIGCHLD */
191 struct {
192 compat_pid_t _pid; /* which child */
193 __compat_uid32_t _uid; /* sender's uid */
194 int _status; /* exit code */
195 compat_clock_t _utime;
196 compat_clock_t _stime;
197 } _sigchld;
198
199#ifdef CONFIG_X86_X32_ABI
200 /* SIGCHLD (x32 version) */
201 struct {
202 compat_pid_t _pid; /* which child */
203 __compat_uid32_t _uid; /* sender's uid */
204 int _status; /* exit code */
205 compat_s64 _utime;
206 compat_s64 _stime;
207 } _sigchld_x32;
208#endif
209
210 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
211 struct {
212 compat_uptr_t _addr; /* faulting insn/memory ref. */
213#define __COMPAT_ADDR_BND_PKEY_PAD (__alignof__(compat_uptr_t) < sizeof(short) ? \
214 sizeof(short) : __alignof__(compat_uptr_t))
215 union {
216 /* used on alpha and sparc */
217 int _trapno; /* TRAP # which caused the signal */
218 /*
219 * used when si_code=BUS_MCEERR_AR or
220 * used when si_code=BUS_MCEERR_AO
221 */
222 short int _addr_lsb; /* Valid LSB of the reported address. */
223 /* used when si_code=SEGV_BNDERR */
224 struct {
225 char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
226 compat_uptr_t _lower;
227 compat_uptr_t _upper;
228 } _addr_bnd;
229 /* used when si_code=SEGV_PKUERR */
230 struct {
231 char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
232 u32 _pkey;
233 } _addr_pkey;
234 /* used when si_code=TRAP_PERF */
235 struct {
236 compat_ulong_t _data;
237 u32 _type;
238 u32 _flags;
239 } _perf;
240 };
241 } _sigfault;
242
243 /* SIGPOLL */
244 struct {
245 compat_long_t _band; /* POLL_IN, POLL_OUT, POLL_MSG */
246 int _fd;
247 } _sigpoll;
248
249 struct {
250 compat_uptr_t _call_addr; /* calling user insn */
251 int _syscall; /* triggering system call number */
252 unsigned int _arch; /* AUDIT_ARCH_* of syscall */
253 } _sigsys;
254 } _sifields;
255} compat_siginfo_t;
256
257struct compat_rlimit {
258 compat_ulong_t rlim_cur;
259 compat_ulong_t rlim_max;
260};
261
262#ifdef __ARCH_NEED_COMPAT_FLOCK64_PACKED
263#define __ARCH_COMPAT_FLOCK64_PACK __attribute__((packed))
264#else
265#define __ARCH_COMPAT_FLOCK64_PACK
266#endif
267
268struct compat_flock {
269 short l_type;
270 short l_whence;
271 compat_off_t l_start;
272 compat_off_t l_len;
273#ifdef __ARCH_COMPAT_FLOCK_EXTRA_SYSID
274 __ARCH_COMPAT_FLOCK_EXTRA_SYSID
275#endif
276 compat_pid_t l_pid;
277#ifdef __ARCH_COMPAT_FLOCK_PAD
278 __ARCH_COMPAT_FLOCK_PAD
279#endif
280};
281
282struct compat_flock64 {
283 short l_type;
284 short l_whence;
285 compat_loff_t l_start;
286 compat_loff_t l_len;
287 compat_pid_t l_pid;
288#ifdef __ARCH_COMPAT_FLOCK64_PAD
289 __ARCH_COMPAT_FLOCK64_PAD
290#endif
291} __ARCH_COMPAT_FLOCK64_PACK;
292
293struct compat_rusage {
294 struct old_timeval32 ru_utime;
295 struct old_timeval32 ru_stime;
296 compat_long_t ru_maxrss;
297 compat_long_t ru_ixrss;
298 compat_long_t ru_idrss;
299 compat_long_t ru_isrss;
300 compat_long_t ru_minflt;
301 compat_long_t ru_majflt;
302 compat_long_t ru_nswap;
303 compat_long_t ru_inblock;
304 compat_long_t ru_oublock;
305 compat_long_t ru_msgsnd;
306 compat_long_t ru_msgrcv;
307 compat_long_t ru_nsignals;
308 compat_long_t ru_nvcsw;
309 compat_long_t ru_nivcsw;
310};
311
312extern int put_compat_rusage(const struct rusage *,
313 struct compat_rusage __user *);
314
315struct compat_siginfo;
316struct __compat_aio_sigset;
317
318struct compat_dirent {
319 u32 d_ino;
320 compat_off_t d_off;
321 u16 d_reclen;
322 char d_name[256];
323};
324
325struct compat_ustat {
326 compat_daddr_t f_tfree;
327 compat_ino_t f_tinode;
328 char f_fname[6];
329 char f_fpack[6];
330};
331
332#define COMPAT_SIGEV_PAD_SIZE ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
333
334typedef struct compat_sigevent {
335 compat_sigval_t sigev_value;
336 compat_int_t sigev_signo;
337 compat_int_t sigev_notify;
338 union {
339 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
340 compat_int_t _tid;
341
342 struct {
343 compat_uptr_t _function;
344 compat_uptr_t _attribute;
345 } _sigev_thread;
346 } _sigev_un;
347} compat_sigevent_t;
348
349struct compat_ifmap {
350 compat_ulong_t mem_start;
351 compat_ulong_t mem_end;
352 unsigned short base_addr;
353 unsigned char irq;
354 unsigned char dma;
355 unsigned char port;
356};
357
358struct compat_if_settings {
359 unsigned int type; /* Type of physical device or protocol */
360 unsigned int size; /* Size of the data allocated by the caller */
361 compat_uptr_t ifs_ifsu; /* union of pointers */
362};
363
364struct compat_ifreq {
365 union {
366 char ifrn_name[IFNAMSIZ]; /* if name, e.g. "en0" */
367 } ifr_ifrn;
368 union {
369 struct sockaddr ifru_addr;
370 struct sockaddr ifru_dstaddr;
371 struct sockaddr ifru_broadaddr;
372 struct sockaddr ifru_netmask;
373 struct sockaddr ifru_hwaddr;
374 short ifru_flags;
375 compat_int_t ifru_ivalue;
376 compat_int_t ifru_mtu;
377 struct compat_ifmap ifru_map;
378 char ifru_slave[IFNAMSIZ]; /* Just fits the size */
379 char ifru_newname[IFNAMSIZ];
380 compat_caddr_t ifru_data;
381 struct compat_if_settings ifru_settings;
382 } ifr_ifru;
383};
384
385struct compat_ifconf {
386 compat_int_t ifc_len; /* size of buffer */
387 compat_caddr_t ifcbuf;
388};
389
390struct compat_robust_list {
391 compat_uptr_t next;
392};
393
394struct compat_robust_list_head {
395 struct compat_robust_list list;
396 compat_long_t futex_offset;
397 compat_uptr_t list_op_pending;
398};
399
400#ifdef CONFIG_COMPAT_OLD_SIGACTION
401struct compat_old_sigaction {
402 compat_uptr_t sa_handler;
403 compat_old_sigset_t sa_mask;
404 compat_ulong_t sa_flags;
405 compat_uptr_t sa_restorer;
406};
407#endif
408
409struct compat_keyctl_kdf_params {
410 compat_uptr_t hashname;
411 compat_uptr_t otherinfo;
412 __u32 otherinfolen;
413 __u32 __spare[8];
414};
415
416struct compat_stat;
417struct compat_statfs;
418struct compat_statfs64;
419struct compat_old_linux_dirent;
420struct compat_linux_dirent;
421struct linux_dirent64;
422struct compat_msghdr;
423struct compat_mmsghdr;
424struct compat_sysinfo;
425struct compat_sysctl_args;
426struct compat_kexec_segment;
427struct compat_mq_attr;
428struct compat_msgbuf;
429
430void copy_siginfo_to_external32(struct compat_siginfo *to,
431 const struct kernel_siginfo *from);
432int copy_siginfo_from_user32(kernel_siginfo_t *to,
433 const struct compat_siginfo __user *from);
434int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
435 const kernel_siginfo_t *from);
436#ifndef copy_siginfo_to_user32
437#define copy_siginfo_to_user32 __copy_siginfo_to_user32
438#endif
439int get_compat_sigevent(struct sigevent *event,
440 const struct compat_sigevent __user *u_event);
441
442extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
443
444/*
445 * Defined inline such that size can be compile time constant, which avoids
446 * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
447 */
448static inline int
449put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
450 unsigned int size)
451{
452 /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
453#if defined(__BIG_ENDIAN) && defined(CONFIG_64BIT)
454 compat_sigset_t v;
455 switch (_NSIG_WORDS) {
456 case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
457 fallthrough;
458 case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
459 fallthrough;
460 case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
461 fallthrough;
462 case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
463 }
464 return copy_to_user(compat, &v, size) ? -EFAULT : 0;
465#else
466 return copy_to_user(compat, set, size) ? -EFAULT : 0;
467#endif
468}
469
470#ifdef CONFIG_CPU_BIG_ENDIAN
471#define unsafe_put_compat_sigset(compat, set, label) do { \
472 compat_sigset_t __user *__c = compat; \
473 const sigset_t *__s = set; \
474 \
475 switch (_NSIG_WORDS) { \
476 case 4: \
477 unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label); \
478 unsafe_put_user(__s->sig[3], &__c->sig[6], label); \
479 fallthrough; \
480 case 3: \
481 unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label); \
482 unsafe_put_user(__s->sig[2], &__c->sig[4], label); \
483 fallthrough; \
484 case 2: \
485 unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label); \
486 unsafe_put_user(__s->sig[1], &__c->sig[2], label); \
487 fallthrough; \
488 case 1: \
489 unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label); \
490 unsafe_put_user(__s->sig[0], &__c->sig[0], label); \
491 } \
492} while (0)
493
494#define unsafe_get_compat_sigset(set, compat, label) do { \
495 const compat_sigset_t __user *__c = compat; \
496 compat_sigset_word hi, lo; \
497 sigset_t *__s = set; \
498 \
499 switch (_NSIG_WORDS) { \
500 case 4: \
501 unsafe_get_user(lo, &__c->sig[7], label); \
502 unsafe_get_user(hi, &__c->sig[6], label); \
503 __s->sig[3] = hi | (((long)lo) << 32); \
504 fallthrough; \
505 case 3: \
506 unsafe_get_user(lo, &__c->sig[5], label); \
507 unsafe_get_user(hi, &__c->sig[4], label); \
508 __s->sig[2] = hi | (((long)lo) << 32); \
509 fallthrough; \
510 case 2: \
511 unsafe_get_user(lo, &__c->sig[3], label); \
512 unsafe_get_user(hi, &__c->sig[2], label); \
513 __s->sig[1] = hi | (((long)lo) << 32); \
514 fallthrough; \
515 case 1: \
516 unsafe_get_user(lo, &__c->sig[1], label); \
517 unsafe_get_user(hi, &__c->sig[0], label); \
518 __s->sig[0] = hi | (((long)lo) << 32); \
519 } \
520} while (0)
521#else
522#define unsafe_put_compat_sigset(compat, set, label) do { \
523 compat_sigset_t __user *__c = compat; \
524 const sigset_t *__s = set; \
525 \
526 unsafe_copy_to_user(__c, __s, sizeof(*__c), label); \
527} while (0)
528
529#define unsafe_get_compat_sigset(set, compat, label) do { \
530 const compat_sigset_t __user *__c = compat; \
531 sigset_t *__s = set; \
532 \
533 unsafe_copy_from_user(__s, __c, sizeof(*__c), label); \
534} while (0)
535#endif
536
537extern int compat_ptrace_request(struct task_struct *child,
538 compat_long_t request,
539 compat_ulong_t addr, compat_ulong_t data);
540
541extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
542 compat_ulong_t addr, compat_ulong_t data);
543
544struct epoll_event; /* fortunately, this one is fixed-layout */
545
546int compat_restore_altstack(const compat_stack_t __user *uss);
547int __compat_save_altstack(compat_stack_t __user *, unsigned long);
548#define unsafe_compat_save_altstack(uss, sp, label) do { \
549 compat_stack_t __user *__uss = uss; \
550 struct task_struct *t = current; \
551 unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
552 &__uss->ss_sp, label); \
553 unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
554 unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
555} while (0);
556
557/*
558 * These syscall function prototypes are kept in the same order as
559 * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
560 * go below.
561 *
562 * Please note that these prototypes here are only provided for information
563 * purposes, for static analysis, and for linking from the syscall table.
564 * These functions should not be called elsewhere from kernel code.
565 *
566 * As the syscall calling convention may be different from the default
567 * for architectures overriding the syscall calling convention, do not
568 * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
569 */
570#ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
571asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
572asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
573 u32 __user *iocb);
574asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
575 compat_long_t min_nr,
576 compat_long_t nr,
577 struct io_event __user *events,
578 struct old_timespec32 __user *timeout,
579 const struct __compat_aio_sigset __user *usig);
580asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
581 compat_long_t min_nr,
582 compat_long_t nr,
583 struct io_event __user *events,
584 struct __kernel_timespec __user *timeout,
585 const struct __compat_aio_sigset __user *usig);
586
587/* fs/cookies.c */
588asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
589
590/* fs/eventpoll.c */
591asmlinkage long compat_sys_epoll_pwait(int epfd,
592 struct epoll_event __user *events,
593 int maxevents, int timeout,
594 const compat_sigset_t __user *sigmask,
595 compat_size_t sigsetsize);
596asmlinkage long compat_sys_epoll_pwait2(int epfd,
597 struct epoll_event __user *events,
598 int maxevents,
599 const struct __kernel_timespec __user *timeout,
600 const compat_sigset_t __user *sigmask,
601 compat_size_t sigsetsize);
602
603/* fs/fcntl.c */
604asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
605 compat_ulong_t arg);
606asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
607 compat_ulong_t arg);
608
609/* fs/ioctl.c */
610asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
611 compat_ulong_t arg);
612
613/* fs/open.c */
614asmlinkage long compat_sys_statfs(const char __user *pathname,
615 struct compat_statfs __user *buf);
616asmlinkage long compat_sys_statfs64(const char __user *pathname,
617 compat_size_t sz,
618 struct compat_statfs64 __user *buf);
619asmlinkage long compat_sys_fstatfs(unsigned int fd,
620 struct compat_statfs __user *buf);
621asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
622 struct compat_statfs64 __user *buf);
623asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
624asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
625/* No generic prototype for truncate64, ftruncate64, fallocate */
626asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
627 int flags, umode_t mode);
628
629/* fs/readdir.c */
630asmlinkage long compat_sys_getdents(unsigned int fd,
631 struct compat_linux_dirent __user *dirent,
632 unsigned int count);
633
634/* fs/read_write.c */
635asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
636/* No generic prototype for pread64 and pwrite64 */
637asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
638 const struct iovec __user *vec,
639 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
640asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
641 const struct iovec __user *vec,
642 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
643#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
644asmlinkage long compat_sys_preadv64(unsigned long fd,
645 const struct iovec __user *vec,
646 unsigned long vlen, loff_t pos);
647#endif
648
649#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
650asmlinkage long compat_sys_pwritev64(unsigned long fd,
651 const struct iovec __user *vec,
652 unsigned long vlen, loff_t pos);
653#endif
654
655/* fs/sendfile.c */
656asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
657 compat_off_t __user *offset, compat_size_t count);
658asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
659 compat_loff_t __user *offset, compat_size_t count);
660
661/* fs/select.c */
662asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
663 compat_ulong_t __user *outp,
664 compat_ulong_t __user *exp,
665 struct old_timespec32 __user *tsp,
666 void __user *sig);
667asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
668 compat_ulong_t __user *outp,
669 compat_ulong_t __user *exp,
670 struct __kernel_timespec __user *tsp,
671 void __user *sig);
672asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
673 unsigned int nfds,
674 struct old_timespec32 __user *tsp,
675 const compat_sigset_t __user *sigmask,
676 compat_size_t sigsetsize);
677asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
678 unsigned int nfds,
679 struct __kernel_timespec __user *tsp,
680 const compat_sigset_t __user *sigmask,
681 compat_size_t sigsetsize);
682
683/* fs/signalfd.c */
684asmlinkage long compat_sys_signalfd4(int ufd,
685 const compat_sigset_t __user *sigmask,
686 compat_size_t sigsetsize, int flags);
687
688/* fs/stat.c */
689asmlinkage long compat_sys_newfstatat(unsigned int dfd,
690 const char __user *filename,
691 struct compat_stat __user *statbuf,
692 int flag);
693asmlinkage long compat_sys_newfstat(unsigned int fd,
694 struct compat_stat __user *statbuf);
695
696/* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
697
698/* kernel/exit.c */
699asmlinkage long compat_sys_waitid(int, compat_pid_t,
700 struct compat_siginfo __user *, int,
701 struct compat_rusage __user *);
702
703
704
705/* kernel/futex.c */
706asmlinkage long
707compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
708 compat_size_t len);
709asmlinkage long
710compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
711 compat_size_t __user *len_ptr);
712
713/* kernel/itimer.c */
714asmlinkage long compat_sys_getitimer(int which,
715 struct old_itimerval32 __user *it);
716asmlinkage long compat_sys_setitimer(int which,
717 struct old_itimerval32 __user *in,
718 struct old_itimerval32 __user *out);
719
720/* kernel/kexec.c */
721asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
722 compat_ulong_t nr_segments,
723 struct compat_kexec_segment __user *,
724 compat_ulong_t flags);
725
726/* kernel/posix-timers.c */
727asmlinkage long compat_sys_timer_create(clockid_t which_clock,
728 struct compat_sigevent __user *timer_event_spec,
729 timer_t __user *created_timer_id);
730
731/* kernel/ptrace.c */
732asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
733 compat_long_t addr, compat_long_t data);
734
735/* kernel/sched/core.c */
736asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
737 unsigned int len,
738 compat_ulong_t __user *user_mask_ptr);
739asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
740 unsigned int len,
741 compat_ulong_t __user *user_mask_ptr);
742
743/* kernel/signal.c */
744asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
745 compat_stack_t __user *uoss_ptr);
746asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
747 compat_size_t sigsetsize);
748#ifndef CONFIG_ODD_RT_SIGACTION
749asmlinkage long compat_sys_rt_sigaction(int,
750 const struct compat_sigaction __user *,
751 struct compat_sigaction __user *,
752 compat_size_t);
753#endif
754asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
755 compat_sigset_t __user *oset,
756 compat_size_t sigsetsize);
757asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
758 compat_size_t sigsetsize);
759asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
760 struct compat_siginfo __user *uinfo,
761 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
762asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
763 struct compat_siginfo __user *uinfo,
764 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
765asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
766 struct compat_siginfo __user *uinfo);
767/* No generic prototype for rt_sigreturn */
768
769/* kernel/sys.c */
770asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
771asmlinkage long compat_sys_getrlimit(unsigned int resource,
772 struct compat_rlimit __user *rlim);
773asmlinkage long compat_sys_setrlimit(unsigned int resource,
774 struct compat_rlimit __user *rlim);
775asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
776
777/* kernel/time.c */
778asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
779 struct timezone __user *tz);
780asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
781 struct timezone __user *tz);
782
783/* kernel/timer.c */
784asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
785
786/* ipc/mqueue.c */
787asmlinkage long compat_sys_mq_open(const char __user *u_name,
788 int oflag, compat_mode_t mode,
789 struct compat_mq_attr __user *u_attr);
790asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
791 const struct compat_sigevent __user *u_notification);
792asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
793 const struct compat_mq_attr __user *u_mqstat,
794 struct compat_mq_attr __user *u_omqstat);
795
796/* ipc/msg.c */
797asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
798asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
799 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
800asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
801 compat_ssize_t msgsz, int msgflg);
802
803/* ipc/sem.c */
804asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
805
806/* ipc/shm.c */
807asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
808asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
809
810/* net/socket.c */
811asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
812 unsigned flags, struct sockaddr __user *addr,
813 int __user *addrlen);
814asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
815 unsigned flags);
816asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
817 unsigned int flags);
818
819/* mm/filemap.c: No generic prototype for readahead */
820
821/* security/keys/keyctl.c */
822asmlinkage long compat_sys_keyctl(u32 option,
823 u32 arg2, u32 arg3, u32 arg4, u32 arg5);
824
825/* arch/example/kernel/sys_example.c */
826asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
827 const compat_uptr_t __user *envp);
828
829/* mm/fadvise.c: No generic prototype for fadvise64_64 */
830
831/* mm/, CONFIG_MMU only */
832asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
833 compat_pid_t pid, int sig,
834 struct compat_siginfo __user *uinfo);
835asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
836 unsigned vlen, unsigned int flags,
837 struct __kernel_timespec __user *timeout);
838asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
839 unsigned vlen, unsigned int flags,
840 struct old_timespec32 __user *timeout);
841asmlinkage long compat_sys_wait4(compat_pid_t pid,
842 compat_uint_t __user *stat_addr, int options,
843 struct compat_rusage __user *ru);
844asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
845 int, const char __user *);
846asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
847 struct file_handle __user *handle,
848 int flags);
849asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
850 unsigned vlen, unsigned int flags);
851asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
852 const compat_uptr_t __user *argv,
853 const compat_uptr_t __user *envp, int flags);
854asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
855 const struct iovec __user *vec,
856 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
857asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
858 const struct iovec __user *vec,
859 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
860#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
861asmlinkage long compat_sys_preadv64v2(unsigned long fd,
862 const struct iovec __user *vec,
863 unsigned long vlen, loff_t pos, rwf_t flags);
864#endif
865
866#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
867asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
868 const struct iovec __user *vec,
869 unsigned long vlen, loff_t pos, rwf_t flags);
870#endif
871
872
873/*
874 * Deprecated system calls which are still defined in
875 * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
876 */
877
878/* __ARCH_WANT_SYSCALL_NO_AT */
879asmlinkage long compat_sys_open(const char __user *filename, int flags,
880 umode_t mode);
881
882/* __ARCH_WANT_SYSCALL_NO_FLAGS */
883asmlinkage long compat_sys_signalfd(int ufd,
884 const compat_sigset_t __user *sigmask,
885 compat_size_t sigsetsize);
886
887/* __ARCH_WANT_SYSCALL_OFF_T */
888asmlinkage long compat_sys_newstat(const char __user *filename,
889 struct compat_stat __user *statbuf);
890asmlinkage long compat_sys_newlstat(const char __user *filename,
891 struct compat_stat __user *statbuf);
892
893/* __ARCH_WANT_SYSCALL_DEPRECATED */
894asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
895 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
896 struct old_timeval32 __user *tvp);
897asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
898asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
899 unsigned flags);
900
901/* obsolete: fs/readdir.c */
902asmlinkage long compat_sys_old_readdir(unsigned int fd,
903 struct compat_old_linux_dirent __user *,
904 unsigned int count);
905
906/* obsolete: fs/select.c */
907asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
908
909/* obsolete: ipc */
910asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
911
912/* obsolete: kernel/signal.c */
913#ifdef __ARCH_WANT_SYS_SIGPENDING
914asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
915#endif
916
917#ifdef __ARCH_WANT_SYS_SIGPROCMASK
918asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
919 compat_old_sigset_t __user *oset);
920#endif
921#ifdef CONFIG_COMPAT_OLD_SIGACTION
922asmlinkage long compat_sys_sigaction(int sig,
923 const struct compat_old_sigaction __user *act,
924 struct compat_old_sigaction __user *oact);
925#endif
926
927/* obsolete: net/socket.c */
928asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
929
930#ifdef __ARCH_WANT_COMPAT_TRUNCATE64
931asmlinkage long compat_sys_truncate64(const char __user *pathname, compat_arg_u64(len));
932#endif
933
934#ifdef __ARCH_WANT_COMPAT_FTRUNCATE64
935asmlinkage long compat_sys_ftruncate64(unsigned int fd, compat_arg_u64(len));
936#endif
937
938#ifdef __ARCH_WANT_COMPAT_FALLOCATE
939asmlinkage long compat_sys_fallocate(int fd, int mode, compat_arg_u64(offset),
940 compat_arg_u64(len));
941#endif
942
943#ifdef __ARCH_WANT_COMPAT_PREAD64
944asmlinkage long compat_sys_pread64(unsigned int fd, char __user *buf, size_t count,
945 compat_arg_u64(pos));
946#endif
947
948#ifdef __ARCH_WANT_COMPAT_PWRITE64
949asmlinkage long compat_sys_pwrite64(unsigned int fd, const char __user *buf, size_t count,
950 compat_arg_u64(pos));
951#endif
952
953#ifdef __ARCH_WANT_COMPAT_SYNC_FILE_RANGE
954asmlinkage long compat_sys_sync_file_range(int fd, compat_arg_u64(pos),
955 compat_arg_u64(nbytes), unsigned int flags);
956#endif
957
958#ifdef __ARCH_WANT_COMPAT_FADVISE64_64
959asmlinkage long compat_sys_fadvise64_64(int fd, compat_arg_u64(pos),
960 compat_arg_u64(len), int advice);
961#endif
962
963#ifdef __ARCH_WANT_COMPAT_READAHEAD
964asmlinkage long compat_sys_readahead(int fd, compat_arg_u64(offset), size_t count);
965#endif
966
967#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
968
969/**
970 * ns_to_old_timeval32 - Compat version of ns_to_timeval
971 * @nsec: the nanoseconds value to be converted
972 *
973 * Returns the old_timeval32 representation of the nsec parameter.
974 */
975static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
976{
977 struct __kernel_old_timeval tv;
978 struct old_timeval32 ctv;
979
980 tv = ns_to_kernel_old_timeval(nsec);
981 ctv.tv_sec = tv.tv_sec;
982 ctv.tv_usec = tv.tv_usec;
983
984 return ctv;
985}
986
987/*
988 * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
989 * directly. Instead, use one of the functions which work equivalently, such
990 * as the kcompat_sys_xyzyyz() functions prototyped below.
991 */
992
993int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
994 struct compat_statfs64 __user * buf);
995int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
996 struct compat_statfs64 __user * buf);
997
998#ifdef CONFIG_COMPAT
999
1000/*
1001 * For most but not all architectures, "am I in a compat syscall?" and
1002 * "am I a compat task?" are the same question. For architectures on which
1003 * they aren't the same question, arch code can override in_compat_syscall.
1004 */
1005#ifndef in_compat_syscall
1006static inline bool in_compat_syscall(void) { return is_compat_task(); }
1007#endif
1008
1009#else /* !CONFIG_COMPAT */
1010
1011#define is_compat_task() (0)
1012/* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
1013#define in_compat_syscall in_compat_syscall
1014static inline bool in_compat_syscall(void) { return false; }
1015
1016#endif /* CONFIG_COMPAT */
1017
1018#define BITS_PER_COMPAT_LONG (8*sizeof(compat_long_t))
1019
1020#define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
1021
1022long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
1023 unsigned long bitmap_size);
1024long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
1025 unsigned long bitmap_size);
1026
1027/*
1028 * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
1029 * types, and will need special compat treatment for that. Most architectures
1030 * don't need that special handling even for compat syscalls.
1031 */
1032#ifndef compat_need_64bit_alignment_fixup
1033#define compat_need_64bit_alignment_fixup() false
1034#endif
1035
1036/*
1037 * A pointer passed in from user mode. This should not
1038 * be used for syscall parameters, just declare them
1039 * as pointers because the syscall entry code will have
1040 * appropriately converted them already.
1041 */
1042#ifndef compat_ptr
1043static inline void __user *compat_ptr(compat_uptr_t uptr)
1044{
1045 return (void __user *)(unsigned long)uptr;
1046}
1047#endif
1048
1049static inline compat_uptr_t ptr_to_compat(void __user *uptr)
1050{
1051 return (u32)(unsigned long)uptr;
1052}
1053
1054#endif /* _LINUX_COMPAT_H */
1055

source code of linux/include/linux/compat.h