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