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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_COMPAT_H
3 #define _LINUX_COMPAT_H
4 /*
5  * These are the type definitions for the architecture specific
6  * syscall compatibility layer.
7  */
8 
9 #include <linux/types.h>
10 #include <linux/time.h>
11 
12 #include <linux/stat.h>
13 #include <linux/param.h>	/* for HZ */
14 #include <linux/sem.h>
15 #include <linux/socket.h>
16 #include <linux/if.h>
17 #include <linux/fs.h>
18 #include <linux/aio_abi.h>	/* for aio_context_t */
19 #include <linux/uaccess.h>
20 #include <linux/unistd.h>
21 
22 #include <asm/compat.h>
23 #include <asm/siginfo.h>
24 #include <asm/signal.h>
25 
26 #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
27 /*
28  * It may be useful for an architecture to override the definitions of the
29  * COMPAT_SYSCALL_DEFINE0 and COMPAT_SYSCALL_DEFINEx() macros, in particular
30  * to use a different calling convention for syscalls. To allow for that,
31  + the prototypes for the compat_sys_*() functions below will *not* be included
32  * if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
33  */
34 #include <asm/syscall_wrapper.h>
35 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
36 
37 #ifndef COMPAT_USE_64BIT_TIME
38 #define COMPAT_USE_64BIT_TIME 0
39 #endif
40 
41 #ifndef __SC_DELOUSE
42 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
43 #endif
44 
45 #ifndef COMPAT_SYSCALL_DEFINE0
46 #define COMPAT_SYSCALL_DEFINE0(name) \
47 	asmlinkage long compat_sys_##name(void); \
48 	ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
49 	asmlinkage long compat_sys_##name(void)
50 #endif /* COMPAT_SYSCALL_DEFINE0 */
51 
52 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
53         COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
54 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
55 	COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
56 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
57 	COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
58 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
59 	COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
60 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
61 	COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
62 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
63 	COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
64 
65 /*
66  * The asmlinkage stub is aliased to a function named __se_compat_sys_*() which
67  * sign-extends 32-bit ints to longs whenever needed. The actual work is
68  * done within __do_compat_sys_*().
69  */
70 #ifndef COMPAT_SYSCALL_DEFINEx
71 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)					\
72 	__diag_push();								\
73 	__diag_ignore(GCC, 8, "-Wattribute-alias",				\
74 		      "Type aliasing is used to sanitize syscall arguments");\
75 	asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))	\
76 		__attribute__((alias(__stringify(__se_compat_sys##name))));	\
77 	ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO);				\
78 	static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
79 	asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));	\
80 	asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))	\
81 	{									\
82 		long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
83 		__MAP(x,__SC_TEST,__VA_ARGS__);					\
84 		return ret;							\
85 	}									\
86 	__diag_pop();								\
87 	static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
88 #endif /* COMPAT_SYSCALL_DEFINEx */
89 
90 struct compat_iovec {
91 	compat_uptr_t	iov_base;
92 	compat_size_t	iov_len;
93 };
94 
95 #ifndef compat_user_stack_pointer
96 #define compat_user_stack_pointer() current_user_stack_pointer()
97 #endif
98 #ifndef compat_sigaltstack	/* we'll need that for MIPS */
99 typedef struct compat_sigaltstack {
100 	compat_uptr_t			ss_sp;
101 	int				ss_flags;
102 	compat_size_t			ss_size;
103 } compat_stack_t;
104 #endif
105 #ifndef COMPAT_MINSIGSTKSZ
106 #define COMPAT_MINSIGSTKSZ	MINSIGSTKSZ
107 #endif
108 
109 #define compat_jiffies_to_clock_t(x)	\
110 		(((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
111 
112 typedef __compat_uid32_t	compat_uid_t;
113 typedef __compat_gid32_t	compat_gid_t;
114 
115 struct compat_sel_arg_struct;
116 struct rusage;
117 
118 struct old_itimerval32;
119 
120 struct compat_tms {
121 	compat_clock_t		tms_utime;
122 	compat_clock_t		tms_stime;
123 	compat_clock_t		tms_cutime;
124 	compat_clock_t		tms_cstime;
125 };
126 
127 #define _COMPAT_NSIG_WORDS	(_COMPAT_NSIG / _COMPAT_NSIG_BPW)
128 
129 #ifndef compat_sigset_t
130 typedef struct {
131 	compat_sigset_word	sig[_COMPAT_NSIG_WORDS];
132 } compat_sigset_t;
133 #endif
134 
135 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
136 			    size_t sigsetsize);
137 
138 struct 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 
152 typedef union compat_sigval {
153 	compat_int_t	sival_int;
154 	compat_uptr_t	sival_ptr;
155 } compat_sigval_t;
156 
157 typedef 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 
257 struct compat_rlimit {
258 	compat_ulong_t	rlim_cur;
259 	compat_ulong_t	rlim_max;
260 };
261 
262 struct compat_rusage {
263 	struct old_timeval32 ru_utime;
264 	struct old_timeval32 ru_stime;
265 	compat_long_t	ru_maxrss;
266 	compat_long_t	ru_ixrss;
267 	compat_long_t	ru_idrss;
268 	compat_long_t	ru_isrss;
269 	compat_long_t	ru_minflt;
270 	compat_long_t	ru_majflt;
271 	compat_long_t	ru_nswap;
272 	compat_long_t	ru_inblock;
273 	compat_long_t	ru_oublock;
274 	compat_long_t	ru_msgsnd;
275 	compat_long_t	ru_msgrcv;
276 	compat_long_t	ru_nsignals;
277 	compat_long_t	ru_nvcsw;
278 	compat_long_t	ru_nivcsw;
279 };
280 
281 extern int put_compat_rusage(const struct rusage *,
282 			     struct compat_rusage __user *);
283 
284 struct compat_siginfo;
285 struct __compat_aio_sigset;
286 
287 struct compat_dirent {
288 	u32		d_ino;
289 	compat_off_t	d_off;
290 	u16		d_reclen;
291 	char		d_name[256];
292 };
293 
294 struct compat_ustat {
295 	compat_daddr_t		f_tfree;
296 	compat_ino_t		f_tinode;
297 	char			f_fname[6];
298 	char			f_fpack[6];
299 };
300 
301 #define COMPAT_SIGEV_PAD_SIZE	((SIGEV_MAX_SIZE/sizeof(int)) - 3)
302 
303 typedef struct compat_sigevent {
304 	compat_sigval_t sigev_value;
305 	compat_int_t sigev_signo;
306 	compat_int_t sigev_notify;
307 	union {
308 		compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
309 		compat_int_t _tid;
310 
311 		struct {
312 			compat_uptr_t _function;
313 			compat_uptr_t _attribute;
314 		} _sigev_thread;
315 	} _sigev_un;
316 } compat_sigevent_t;
317 
318 struct compat_ifmap {
319 	compat_ulong_t mem_start;
320 	compat_ulong_t mem_end;
321 	unsigned short base_addr;
322 	unsigned char irq;
323 	unsigned char dma;
324 	unsigned char port;
325 };
326 
327 struct compat_if_settings {
328 	unsigned int type;	/* Type of physical device or protocol */
329 	unsigned int size;	/* Size of the data allocated by the caller */
330 	compat_uptr_t ifs_ifsu;	/* union of pointers */
331 };
332 
333 struct compat_ifreq {
334 	union {
335 		char	ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
336 	} ifr_ifrn;
337 	union {
338 		struct	sockaddr ifru_addr;
339 		struct	sockaddr ifru_dstaddr;
340 		struct	sockaddr ifru_broadaddr;
341 		struct	sockaddr ifru_netmask;
342 		struct	sockaddr ifru_hwaddr;
343 		short	ifru_flags;
344 		compat_int_t	ifru_ivalue;
345 		compat_int_t	ifru_mtu;
346 		struct	compat_ifmap ifru_map;
347 		char	ifru_slave[IFNAMSIZ];   /* Just fits the size */
348 		char	ifru_newname[IFNAMSIZ];
349 		compat_caddr_t	ifru_data;
350 		struct	compat_if_settings ifru_settings;
351 	} ifr_ifru;
352 };
353 
354 struct compat_ifconf {
355 	compat_int_t	ifc_len;                /* size of buffer */
356 	compat_caddr_t  ifcbuf;
357 };
358 
359 struct compat_robust_list {
360 	compat_uptr_t			next;
361 };
362 
363 struct compat_robust_list_head {
364 	struct compat_robust_list	list;
365 	compat_long_t			futex_offset;
366 	compat_uptr_t			list_op_pending;
367 };
368 
369 #ifdef CONFIG_COMPAT_OLD_SIGACTION
370 struct compat_old_sigaction {
371 	compat_uptr_t			sa_handler;
372 	compat_old_sigset_t		sa_mask;
373 	compat_ulong_t			sa_flags;
374 	compat_uptr_t			sa_restorer;
375 };
376 #endif
377 
378 struct compat_keyctl_kdf_params {
379 	compat_uptr_t hashname;
380 	compat_uptr_t otherinfo;
381 	__u32 otherinfolen;
382 	__u32 __spare[8];
383 };
384 
385 struct compat_stat;
386 struct compat_statfs;
387 struct compat_statfs64;
388 struct compat_old_linux_dirent;
389 struct compat_linux_dirent;
390 struct linux_dirent64;
391 struct compat_msghdr;
392 struct compat_mmsghdr;
393 struct compat_sysinfo;
394 struct compat_sysctl_args;
395 struct compat_kexec_segment;
396 struct compat_mq_attr;
397 struct compat_msgbuf;
398 
399 void copy_siginfo_to_external32(struct compat_siginfo *to,
400 		const struct kernel_siginfo *from);
401 int copy_siginfo_from_user32(kernel_siginfo_t *to,
402 		const struct compat_siginfo __user *from);
403 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
404 		const kernel_siginfo_t *from);
405 #ifndef copy_siginfo_to_user32
406 #define copy_siginfo_to_user32 __copy_siginfo_to_user32
407 #endif
408 int get_compat_sigevent(struct sigevent *event,
409 		const struct compat_sigevent __user *u_event);
410 
411 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
412 
413 /*
414  * Defined inline such that size can be compile time constant, which avoids
415  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
416  */
417 static inline int
put_compat_sigset(compat_sigset_t __user * compat,const sigset_t * set,unsigned int size)418 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
419 		  unsigned int size)
420 {
421 	/* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
422 #if defined(__BIG_ENDIAN) && defined(CONFIG_64BIT)
423 	compat_sigset_t v;
424 	switch (_NSIG_WORDS) {
425 	case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
426 		fallthrough;
427 	case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
428 		fallthrough;
429 	case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
430 		fallthrough;
431 	case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
432 	}
433 	return copy_to_user(compat, &v, size) ? -EFAULT : 0;
434 #else
435 	return copy_to_user(compat, set, size) ? -EFAULT : 0;
436 #endif
437 }
438 
439 #ifdef CONFIG_CPU_BIG_ENDIAN
440 #define unsafe_put_compat_sigset(compat, set, label) do {		\
441 	compat_sigset_t __user *__c = compat;				\
442 	const sigset_t *__s = set;					\
443 									\
444 	switch (_NSIG_WORDS) {						\
445 	case 4:								\
446 		unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label);	\
447 		unsafe_put_user(__s->sig[3], &__c->sig[6], label);	\
448 		fallthrough;						\
449 	case 3:								\
450 		unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label);	\
451 		unsafe_put_user(__s->sig[2], &__c->sig[4], label);	\
452 		fallthrough;						\
453 	case 2:								\
454 		unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label);	\
455 		unsafe_put_user(__s->sig[1], &__c->sig[2], label);	\
456 		fallthrough;						\
457 	case 1:								\
458 		unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label);	\
459 		unsafe_put_user(__s->sig[0], &__c->sig[0], label);	\
460 	}								\
461 } while (0)
462 
463 #define unsafe_get_compat_sigset(set, compat, label) do {		\
464 	const compat_sigset_t __user *__c = compat;			\
465 	compat_sigset_word hi, lo;					\
466 	sigset_t *__s = set;						\
467 									\
468 	switch (_NSIG_WORDS) {						\
469 	case 4:								\
470 		unsafe_get_user(lo, &__c->sig[7], label);		\
471 		unsafe_get_user(hi, &__c->sig[6], label);		\
472 		__s->sig[3] = hi | (((long)lo) << 32);			\
473 		fallthrough;						\
474 	case 3:								\
475 		unsafe_get_user(lo, &__c->sig[5], label);		\
476 		unsafe_get_user(hi, &__c->sig[4], label);		\
477 		__s->sig[2] = hi | (((long)lo) << 32);			\
478 		fallthrough;						\
479 	case 2:								\
480 		unsafe_get_user(lo, &__c->sig[3], label);		\
481 		unsafe_get_user(hi, &__c->sig[2], label);		\
482 		__s->sig[1] = hi | (((long)lo) << 32);			\
483 		fallthrough;						\
484 	case 1:								\
485 		unsafe_get_user(lo, &__c->sig[1], label);		\
486 		unsafe_get_user(hi, &__c->sig[0], label);		\
487 		__s->sig[0] = hi | (((long)lo) << 32);			\
488 	}								\
489 } while (0)
490 #else
491 #define unsafe_put_compat_sigset(compat, set, label) do {		\
492 	compat_sigset_t __user *__c = compat;				\
493 	const sigset_t *__s = set;					\
494 									\
495 	unsafe_copy_to_user(__c, __s, sizeof(*__c), label);		\
496 } while (0)
497 
498 #define unsafe_get_compat_sigset(set, compat, label) do {		\
499 	const compat_sigset_t __user *__c = compat;			\
500 	sigset_t *__s = set;						\
501 									\
502 	unsafe_copy_from_user(__s, __c, sizeof(*__c), label);		\
503 } while (0)
504 #endif
505 
506 extern int compat_ptrace_request(struct task_struct *child,
507 				 compat_long_t request,
508 				 compat_ulong_t addr, compat_ulong_t data);
509 
510 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
511 			       compat_ulong_t addr, compat_ulong_t data);
512 
513 struct epoll_event;	/* fortunately, this one is fixed-layout */
514 
515 int compat_restore_altstack(const compat_stack_t __user *uss);
516 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
517 #define unsafe_compat_save_altstack(uss, sp, label) do { \
518 	compat_stack_t __user *__uss = uss; \
519 	struct task_struct *t = current; \
520 	unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
521 			&__uss->ss_sp, label); \
522 	unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
523 	unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
524 } while (0);
525 
526 /*
527  * These syscall function prototypes are kept in the same order as
528  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
529  * go below.
530  *
531  * Please note that these prototypes here are only provided for information
532  * purposes, for static analysis, and for linking from the syscall table.
533  * These functions should not be called elsewhere from kernel code.
534  *
535  * As the syscall calling convention may be different from the default
536  * for architectures overriding the syscall calling convention, do not
537  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
538  */
539 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
540 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
541 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
542 				     u32 __user *iocb);
543 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
544 					compat_long_t min_nr,
545 					compat_long_t nr,
546 					struct io_event __user *events,
547 					struct old_timespec32 __user *timeout,
548 					const struct __compat_aio_sigset __user *usig);
549 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
550 					compat_long_t min_nr,
551 					compat_long_t nr,
552 					struct io_event __user *events,
553 					struct __kernel_timespec __user *timeout,
554 					const struct __compat_aio_sigset __user *usig);
555 
556 /* fs/cookies.c */
557 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
558 
559 /* fs/eventpoll.c */
560 asmlinkage long compat_sys_epoll_pwait(int epfd,
561 			struct epoll_event __user *events,
562 			int maxevents, int timeout,
563 			const compat_sigset_t __user *sigmask,
564 			compat_size_t sigsetsize);
565 asmlinkage long compat_sys_epoll_pwait2(int epfd,
566 			struct epoll_event __user *events,
567 			int maxevents,
568 			const struct __kernel_timespec __user *timeout,
569 			const compat_sigset_t __user *sigmask,
570 			compat_size_t sigsetsize);
571 
572 /* fs/fcntl.c */
573 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
574 				 compat_ulong_t arg);
575 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
576 				   compat_ulong_t arg);
577 
578 /* fs/ioctl.c */
579 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
580 				 compat_ulong_t arg);
581 
582 /* fs/open.c */
583 asmlinkage long compat_sys_statfs(const char __user *pathname,
584 				  struct compat_statfs __user *buf);
585 asmlinkage long compat_sys_statfs64(const char __user *pathname,
586 				    compat_size_t sz,
587 				    struct compat_statfs64 __user *buf);
588 asmlinkage long compat_sys_fstatfs(unsigned int fd,
589 				   struct compat_statfs __user *buf);
590 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
591 				     struct compat_statfs64 __user *buf);
592 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
593 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
594 /* No generic prototype for truncate64, ftruncate64, fallocate */
595 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
596 				  int flags, umode_t mode);
597 
598 /* fs/readdir.c */
599 asmlinkage long compat_sys_getdents(unsigned int fd,
600 				    struct compat_linux_dirent __user *dirent,
601 				    unsigned int count);
602 
603 /* fs/read_write.c */
604 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
605 /* No generic prototype for pread64 and pwrite64 */
606 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
607 		const struct iovec __user *vec,
608 		compat_ulong_t vlen, u32 pos_low, u32 pos_high);
609 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
610 		const struct iovec __user *vec,
611 		compat_ulong_t vlen, u32 pos_low, u32 pos_high);
612 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
613 asmlinkage long compat_sys_preadv64(unsigned long fd,
614 		const struct iovec __user *vec,
615 		unsigned long vlen, loff_t pos);
616 #endif
617 
618 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
619 asmlinkage long compat_sys_pwritev64(unsigned long fd,
620 		const struct iovec __user *vec,
621 		unsigned long vlen, loff_t pos);
622 #endif
623 
624 /* fs/sendfile.c */
625 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
626 				    compat_off_t __user *offset, compat_size_t count);
627 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
628 				    compat_loff_t __user *offset, compat_size_t count);
629 
630 /* fs/select.c */
631 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
632 				    compat_ulong_t __user *outp,
633 				    compat_ulong_t __user *exp,
634 				    struct old_timespec32 __user *tsp,
635 				    void __user *sig);
636 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
637 				    compat_ulong_t __user *outp,
638 				    compat_ulong_t __user *exp,
639 				    struct __kernel_timespec __user *tsp,
640 				    void __user *sig);
641 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
642 				 unsigned int nfds,
643 				 struct old_timespec32 __user *tsp,
644 				 const compat_sigset_t __user *sigmask,
645 				 compat_size_t sigsetsize);
646 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
647 				 unsigned int nfds,
648 				 struct __kernel_timespec __user *tsp,
649 				 const compat_sigset_t __user *sigmask,
650 				 compat_size_t sigsetsize);
651 
652 /* fs/signalfd.c */
653 asmlinkage long compat_sys_signalfd4(int ufd,
654 				     const compat_sigset_t __user *sigmask,
655 				     compat_size_t sigsetsize, int flags);
656 
657 /* fs/stat.c */
658 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
659 				      const char __user *filename,
660 				      struct compat_stat __user *statbuf,
661 				      int flag);
662 asmlinkage long compat_sys_newfstat(unsigned int fd,
663 				    struct compat_stat __user *statbuf);
664 
665 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
666 
667 /* kernel/exit.c */
668 asmlinkage long compat_sys_waitid(int, compat_pid_t,
669 		struct compat_siginfo __user *, int,
670 		struct compat_rusage __user *);
671 
672 
673 
674 /* kernel/futex.c */
675 asmlinkage long
676 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
677 			   compat_size_t len);
678 asmlinkage long
679 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
680 			   compat_size_t __user *len_ptr);
681 
682 /* kernel/itimer.c */
683 asmlinkage long compat_sys_getitimer(int which,
684 				     struct old_itimerval32 __user *it);
685 asmlinkage long compat_sys_setitimer(int which,
686 				     struct old_itimerval32 __user *in,
687 				     struct old_itimerval32 __user *out);
688 
689 /* kernel/kexec.c */
690 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
691 				      compat_ulong_t nr_segments,
692 				      struct compat_kexec_segment __user *,
693 				      compat_ulong_t flags);
694 
695 /* kernel/posix-timers.c */
696 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
697 			struct compat_sigevent __user *timer_event_spec,
698 			timer_t __user *created_timer_id);
699 
700 /* kernel/ptrace.c */
701 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
702 				  compat_long_t addr, compat_long_t data);
703 
704 /* kernel/sched/core.c */
705 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
706 				     unsigned int len,
707 				     compat_ulong_t __user *user_mask_ptr);
708 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
709 				     unsigned int len,
710 				     compat_ulong_t __user *user_mask_ptr);
711 
712 /* kernel/signal.c */
713 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
714 				       compat_stack_t __user *uoss_ptr);
715 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
716 					 compat_size_t sigsetsize);
717 #ifndef CONFIG_ODD_RT_SIGACTION
718 asmlinkage long compat_sys_rt_sigaction(int,
719 				 const struct compat_sigaction __user *,
720 				 struct compat_sigaction __user *,
721 				 compat_size_t);
722 #endif
723 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
724 					  compat_sigset_t __user *oset,
725 					  compat_size_t sigsetsize);
726 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
727 					 compat_size_t sigsetsize);
728 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
729 		struct compat_siginfo __user *uinfo,
730 		struct old_timespec32 __user *uts, compat_size_t sigsetsize);
731 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
732 		struct compat_siginfo __user *uinfo,
733 		struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
734 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
735 				struct compat_siginfo __user *uinfo);
736 /* No generic prototype for rt_sigreturn */
737 
738 /* kernel/sys.c */
739 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
740 asmlinkage long compat_sys_getrlimit(unsigned int resource,
741 				     struct compat_rlimit __user *rlim);
742 asmlinkage long compat_sys_setrlimit(unsigned int resource,
743 				     struct compat_rlimit __user *rlim);
744 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
745 
746 /* kernel/time.c */
747 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
748 		struct timezone __user *tz);
749 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
750 		struct timezone __user *tz);
751 
752 /* kernel/timer.c */
753 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
754 
755 /* ipc/mqueue.c */
756 asmlinkage long compat_sys_mq_open(const char __user *u_name,
757 			int oflag, compat_mode_t mode,
758 			struct compat_mq_attr __user *u_attr);
759 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
760 			const struct compat_sigevent __user *u_notification);
761 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
762 			const struct compat_mq_attr __user *u_mqstat,
763 			struct compat_mq_attr __user *u_omqstat);
764 
765 /* ipc/msg.c */
766 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
767 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
768 		compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
769 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
770 		compat_ssize_t msgsz, int msgflg);
771 
772 /* ipc/sem.c */
773 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
774 
775 /* ipc/shm.c */
776 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
777 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
778 
779 /* net/socket.c */
780 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
781 			    unsigned flags, struct sockaddr __user *addr,
782 			    int __user *addrlen);
783 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
784 				   unsigned flags);
785 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
786 				   unsigned int flags);
787 
788 /* mm/filemap.c: No generic prototype for readahead */
789 
790 /* security/keys/keyctl.c */
791 asmlinkage long compat_sys_keyctl(u32 option,
792 			      u32 arg2, u32 arg3, u32 arg4, u32 arg5);
793 
794 /* arch/example/kernel/sys_example.c */
795 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
796 		     const compat_uptr_t __user *envp);
797 
798 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
799 
800 /* mm/, CONFIG_MMU only */
801 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
802 					compat_pid_t pid, int sig,
803 					struct compat_siginfo __user *uinfo);
804 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
805 				    unsigned vlen, unsigned int flags,
806 				    struct __kernel_timespec __user *timeout);
807 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
808 				    unsigned vlen, unsigned int flags,
809 				    struct old_timespec32 __user *timeout);
810 asmlinkage long compat_sys_wait4(compat_pid_t pid,
811 				 compat_uint_t __user *stat_addr, int options,
812 				 struct compat_rusage __user *ru);
813 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
814 					    int, const char __user *);
815 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
816 					     struct file_handle __user *handle,
817 					     int flags);
818 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
819 				    unsigned vlen, unsigned int flags);
820 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
821 		     const compat_uptr_t __user *argv,
822 		     const compat_uptr_t __user *envp, int flags);
823 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
824 		const struct iovec __user *vec,
825 		compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
826 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
827 		const struct iovec __user *vec,
828 		compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
829 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
830 asmlinkage long  compat_sys_preadv64v2(unsigned long fd,
831 		const struct iovec __user *vec,
832 		unsigned long vlen, loff_t pos, rwf_t flags);
833 #endif
834 
835 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
836 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
837 		const struct iovec __user *vec,
838 		unsigned long vlen, loff_t pos, rwf_t flags);
839 #endif
840 
841 
842 /*
843  * Deprecated system calls which are still defined in
844  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
845  */
846 
847 /* __ARCH_WANT_SYSCALL_NO_AT */
848 asmlinkage long compat_sys_open(const char __user *filename, int flags,
849 				umode_t mode);
850 
851 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
852 asmlinkage long compat_sys_signalfd(int ufd,
853 				    const compat_sigset_t __user *sigmask,
854 				    compat_size_t sigsetsize);
855 
856 /* __ARCH_WANT_SYSCALL_OFF_T */
857 asmlinkage long compat_sys_newstat(const char __user *filename,
858 				   struct compat_stat __user *statbuf);
859 asmlinkage long compat_sys_newlstat(const char __user *filename,
860 				    struct compat_stat __user *statbuf);
861 
862 /* __ARCH_WANT_SYSCALL_DEPRECATED */
863 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
864 		compat_ulong_t __user *outp, compat_ulong_t __user *exp,
865 		struct old_timeval32 __user *tvp);
866 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
867 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
868 				unsigned flags);
869 
870 /* obsolete: fs/readdir.c */
871 asmlinkage long compat_sys_old_readdir(unsigned int fd,
872 				       struct compat_old_linux_dirent __user *,
873 				       unsigned int count);
874 
875 /* obsolete: fs/select.c */
876 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
877 
878 /* obsolete: ipc */
879 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
880 
881 /* obsolete: kernel/signal.c */
882 #ifdef __ARCH_WANT_SYS_SIGPENDING
883 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
884 #endif
885 
886 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
887 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
888 				       compat_old_sigset_t __user *oset);
889 #endif
890 #ifdef CONFIG_COMPAT_OLD_SIGACTION
891 asmlinkage long compat_sys_sigaction(int sig,
892                                    const struct compat_old_sigaction __user *act,
893                                    struct compat_old_sigaction __user *oact);
894 #endif
895 
896 /* obsolete: net/socket.c */
897 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
898 
899 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
900 
901 /**
902  * ns_to_old_timeval32 - Compat version of ns_to_timeval
903  * @nsec:	the nanoseconds value to be converted
904  *
905  * Returns the old_timeval32 representation of the nsec parameter.
906  */
ns_to_old_timeval32(s64 nsec)907 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
908 {
909 	struct __kernel_old_timeval tv;
910 	struct old_timeval32 ctv;
911 
912 	tv = ns_to_kernel_old_timeval(nsec);
913 	ctv.tv_sec = tv.tv_sec;
914 	ctv.tv_usec = tv.tv_usec;
915 
916 	return ctv;
917 }
918 
919 /*
920  * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
921  * directly.  Instead, use one of the functions which work equivalently, such
922  * as the kcompat_sys_xyzyyz() functions prototyped below.
923  */
924 
925 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
926 		     struct compat_statfs64 __user * buf);
927 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
928 			  struct compat_statfs64 __user * buf);
929 
930 #ifdef CONFIG_COMPAT
931 
932 /*
933  * For most but not all architectures, "am I in a compat syscall?" and
934  * "am I a compat task?" are the same question.  For architectures on which
935  * they aren't the same question, arch code can override in_compat_syscall.
936  */
937 #ifndef in_compat_syscall
in_compat_syscall(void)938 static inline bool in_compat_syscall(void) { return is_compat_task(); }
939 #endif
940 
941 #else /* !CONFIG_COMPAT */
942 
943 #define is_compat_task() (0)
944 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
945 #define in_compat_syscall in_compat_syscall
in_compat_syscall(void)946 static inline bool in_compat_syscall(void) { return false; }
947 
948 #endif /* CONFIG_COMPAT */
949 
950 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
951 
952 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
953 
954 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
955 		       unsigned long bitmap_size);
956 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
957 		       unsigned long bitmap_size);
958 
959 /*
960  * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
961  * types, and will need special compat treatment for that.  Most architectures
962  * don't need that special handling even for compat syscalls.
963  */
964 #ifndef compat_need_64bit_alignment_fixup
965 #define compat_need_64bit_alignment_fixup()		false
966 #endif
967 
968 /*
969  * A pointer passed in from user mode. This should not
970  * be used for syscall parameters, just declare them
971  * as pointers because the syscall entry code will have
972  * appropriately converted them already.
973  */
974 #ifndef compat_ptr
compat_ptr(compat_uptr_t uptr)975 static inline void __user *compat_ptr(compat_uptr_t uptr)
976 {
977 	return (void __user *)(unsigned long)uptr;
978 }
979 #endif
980 
ptr_to_compat(void __user * uptr)981 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
982 {
983 	return (u32)(unsigned long)uptr;
984 }
985 
986 #endif /* _LINUX_COMPAT_H */
987