summaryrefslogtreecommitdiffstats
path: root/ipc/compat.c
blob: fbfd6fb0a68d2350d7df6fdd4a8a1586737ecb2e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
/*
 * 32 bit compatibility code for System V IPC
 *
 * Copyright (C) 1997,1998	Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997		David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1999		Arun Sharma <arun.sharma@intel.com>
 * Copyright (C) 2000		VA Linux Co
 * Copyright (C) 2000		Don Dugger <n0ano@valinux.com>
 * Copyright (C) 2000           Hewlett-Packard Co.
 * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 2000           Gerhard Tonn (ton@de.ibm.com)
 * Copyright (C) 2000-2002      Andi Kleen, SuSE Labs (x86-64 port)
 * Copyright (C) 2000		Silicon Graphics, Inc.
 * Copyright (C) 2001		IBM
 * Copyright (C) 2004		IBM Deutschland Entwicklung GmbH, IBM Corporation
 * Copyright (C) 2004		Arnd Bergmann (arnd@arndb.de)
 *
 * This code is collected from the versions for sparc64, mips64, s390x, ia64,
 * ppc64 and x86_64, all of which are based on the original sparc64 version
 * by Jakub Jelinek.
 *
 */
#include <linux/compat.h>
#include <linux/errno.h>
#include <linux/highuid.h>
#include <linux/init.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/syscalls.h>
#include <linux/ptrace.h>

#include <linux/mutex.h>
#include <linux/uaccess.h>

#include "util.h"

struct compat_msgbuf {
	compat_long_t mtype;
	char mtext[1];
};

struct compat_semid_ds {
	struct compat_ipc_perm sem_perm;
	compat_time_t sem_otime;
	compat_time_t sem_ctime;
	compat_uptr_t sem_base;
	compat_uptr_t sem_pending;
	compat_uptr_t sem_pending_last;
	compat_uptr_t undo;
	unsigned short sem_nsems;
};

struct compat_msqid_ds {
	struct compat_ipc_perm msg_perm;
	compat_uptr_t msg_first;
	compat_uptr_t msg_last;
	compat_time_t msg_stime;
	compat_time_t msg_rtime;
	compat_time_t msg_ctime;
	compat_ulong_t msg_lcbytes;
	compat_ulong_t msg_lqbytes;
	unsigned short msg_cbytes;
	unsigned short msg_qnum;
	unsigned short msg_qbytes;
	compat_ipc_pid_t msg_lspid;
	compat_ipc_pid_t msg_lrpid;
};

struct compat_ipc_kludge {
	compat_uptr_t msgp;
	compat_long_t msgtyp;
};

static inline int __compat_ipc_parse_version(int *cmd)
{
#ifdef	CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
	int version = *cmd & IPC_64;

	/* this is tricky: architectures that have support for the old
	 * ipc structures in 64 bit binaries need to have IPC_64 set
	 * in cmd, the others need to have it cleared */
#ifndef ipc_parse_version
	*cmd |= IPC_64;
#else
	*cmd &= ~IPC_64;
#endif
	return version;
#else
	/* With the asm-generic APIs, we always use the 64-bit versions. */
	return IPC_64;
#endif
}

static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
					  struct compat_ipc64_perm __user *up64)
{
	int err;

	err  = __get_user(p64->uid, &up64->uid);
	err |= __get_user(p64->gid, &up64->gid);
	err |= __get_user(p64->mode, &up64->mode);
	return err;
}

static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
					struct compat_ipc_perm __user *up)
{
	int err;

	err  = __get_user(p->uid, &up->uid);
	err |= __get_user(p->gid, &up->gid);
	err |= __get_user(p->mode, &up->mode);
	return err;
}

static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
					  struct compat_ipc64_perm __user *up64)
{
	int err;

	err  = __put_user(p64->key, &up64->key);
	err |= __put_user(p64->uid, &up64->uid);
	err |= __put_user(p64->gid, &up64->gid);
	err |= __put_user(p64->cuid, &up64->cuid);
	err |= __put_user(p64->cgid, &up64->cgid);
	err |= __put_user(p64->mode, &up64->mode);
	err |= __put_user(p64->seq, &up64->seq);
	return err;
}

static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
					struct compat_ipc_perm __user *uip)
{
	int err;
	__compat_uid_t u;
	__compat_gid_t g;

	err  = __put_user(p->key, &uip->key);
	SET_UID(u, p->uid);
	err |= __put_user(u, &uip->uid);
	SET_GID(g, p->gid);
	err |= __put_user(g, &uip->gid);
	SET_UID(u, p->cuid);
	err |= __put_user(u, &uip->cuid);
	SET_GID(g, p->cgid);
	err |= __put_user(g, &uip->cgid);
	err |= __put_user(p->mode, &uip->mode);
	err |= __put_user(p->seq, &uip->seq);
	return err;
}

static inline int get_compat_semid64_ds(struct semid64_ds *sem64,
					struct compat_semid64_ds __user *up64)
{
	if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
		return -EFAULT;
	return __get_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm);
}

static inline int get_compat_semid_ds(struct semid64_ds *s,
				      struct compat_semid_ds __user *up)
{
	if (!access_ok(VERIFY_READ, up, sizeof(*up)))
		return -EFAULT;
	return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
}

static inline int put_compat_semid64_ds(struct semid64_ds *sem64,
					struct compat_semid64_ds __user *up64)
{
	int err;

	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
		return -EFAULT;
	err  = __put_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm);
	err |= __put_user(sem64->sem_otime, &up64->sem_otime);
	err |= __put_user(sem64->sem_ctime, &up64->sem_ctime);
	err |= __put_user(sem64->sem_nsems, &up64->sem_nsems);
	return err;
}

static inline int put_compat_semid_ds(struct semid64_ds *s,
				      struct compat_semid_ds __user *up)
{
	int err;

	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
		return -EFAULT;
	err  = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
	err |= __put_user(s->sem_otime, &up->sem_otime);
	err |= __put_user(s->sem_ctime, &up->sem_ctime);
	err |= __put_user(s->sem_nsems, &up->sem_nsems);
	return err;
}

static long do_compat_semctl(int first, int second, int third, u32 pad)
{
	unsigned long fourth;
	int err, err2;
	struct semid64_ds sem64;
	struct semid64_ds __user *up64;
	int version = __compat_ipc_parse_version(&third);

	memset(&sem64, 0, sizeof(sem64));

	if ((third & (~IPC_64)) == SETVAL)
#ifdef __BIG_ENDIAN
		fourth = (unsigned long)pad << 32;
#else
		fourth = pad;
#endif
	else
		fourth = (unsigned long)compat_ptr(pad);
	switch (third & (~IPC_64)) {
	case IPC_INFO:
	case IPC_RMID:
	case SEM_INFO:
	case GETVAL:
	case GETPID:
	case GETNCNT:
	case GETZCNT:
	case GETALL:
	case SETVAL:
	case SETALL:
		err = sys_semctl(first, second, third, fourth);
		break;

	case IPC_STAT:
	case SEM_STAT:
		up64 = compat_alloc_user_space(sizeof(sem64));
		fourth = (unsigned long)up64;
		err = sys_semctl(first, second, third, fourth);
		if (err < 0)
			break;
		if (copy_from_user(&sem64, up64, sizeof(sem64)))
			err2 = -EFAULT;
		else if (version == IPC_64)
			err2 = put_compat_semid64_ds(&sem64, compat_ptr(pad));
		else
			err2 = put_compat_semid_ds(&sem64, compat_ptr(pad));
		if (err2)
			err = -EFAULT;
		break;

	case IPC_SET:
		if (version == IPC_64)
			err = get_compat_semid64_ds(&sem64, compat_ptr(pad));
		else
			err = get_compat_semid_ds(&sem64, compat_ptr(pad));

		up64 = compat_alloc_user_space(sizeof(sem64));
		if (copy_to_user(up64, &sem64, sizeof(sem64)))
			err = -EFAULT;
		if (err)
			break;

		fourth = (unsigned long)up64;
		err = sys_semctl(first, second, third, fourth);
		break;

	default:
		err = -EINVAL;
		break;
	}
	return err;
}

static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
{
	struct compat_msgbuf __user *msgp = dest;
	size_t msgsz;

	if (put_user(msg->m_type, &msgp->mtype))
		return -EFAULT;

	msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
	if (store_msg(msgp->mtext, msg, msgsz))
		return -EFAULT;
	return msgsz;
}

#ifndef COMPAT_SHMLBA
#define COMPAT_SHMLBA	SHMLBA
#endif

#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
	u32, third, compat_uptr_t, ptr, u32, fifth)
{
	int version;
	u32 pad;

	version = call >> 16; /* hack for backward compatibility */
	call &= 0xffff;

	switch (call) {
	case SEMOP:
		/* struct sembuf is the same on 32 and 64bit :)) */
		return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
	case SEMTIMEDOP:
		return compat_sys_semtimedop(first, compat_ptr(ptr), second,
						compat_ptr(fifth));
	case SEMGET:
		return sys_semget(first, second, third);
	case SEMCTL:
		if (!ptr)
			return -EINVAL;
		if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
			return -EFAULT;
		return do_compat_semctl(first, second, third, pad);

	case MSGSND: {
		struct compat_msgbuf __user *up = compat_ptr(ptr);
		compat_long_t type;

		if (first < 0 || second < 0)
			return -EINVAL;

		if (get_user(type, &up->mtype))
			return -EFAULT;

		return do_msgsnd(first, type, up->mtext, second, third);
	}
	case MSGRCV: {
		void __user *uptr = compat_ptr(ptr);

		if (first < 0 || second < 0)
			return -EINVAL;

		if (!version) {
			struct compat_ipc_kludge ipck;
			if (!uptr)
				return -EINVAL;
			if (copy_from_user(&ipck, uptr, sizeof(ipck)))
				return -EFAULT;
			uptr = compat_ptr(ipck.msgp);
			fifth = ipck.msgtyp;
		}
		return do_msgrcv(first, uptr, second, (s32)fifth, third,
				 compat_do_msg_fill);
	}
	case MSGGET:
		return sys_msgget(first, second);
	case MSGCTL:
		return compat_sys_msgctl(first, second, compat_ptr(ptr));

	case SHMAT: {
		int err;
		unsigned long raddr;

		if (version == 1)
			return -EINVAL;
		err = do_shmat(first, compat_ptr(ptr), second, &raddr,
			       COMPAT_SHMLBA);
		if (err < 0)
			return err;
		return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
	}
	case SHMDT:
		return sys_shmdt(compat_ptr(ptr));
	case SHMGET:
		return sys_shmget(first, (unsigned)second, third);
	case SHMCTL:
		return compat_sys_shmctl(first, second, compat_ptr(ptr));
	}

	return -ENOSYS;
}
#endif

COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
{
	return do_compat_semctl(semid, semnum, cmd, arg);
}

COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
		       compat_ssize_t, msgsz, int, msgflg)
{
	struct compat_msgbuf __user *up = compat_ptr(msgp);
	compat_long_t mtype;

	if (get_user(mtype, &up->mtype))
		return -EFAULT;
	return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg);
}

COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
		       compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg)
{
	return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp,
			 msgflg, compat_do_msg_fill);
}

static inline int get_compat_msqid64(struct msqid64_ds *m64,
				     struct compat_msqid64_ds __user *up64)
{
	int err;

	if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
		return -EFAULT;
	err  = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
	err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
	return err;
}

static inline int get_compat_msqid(struct msqid64_ds *m,
				   struct compat_msqid_ds __user *up)
{
	int err;

	if (!access_ok(VERIFY_READ, up, sizeof(*up)))
		return -EFAULT;
	err  = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
	err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
	return err;
}

static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
				 struct compat_msqid64_ds __user *up64)
{
	int err;

	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
		return -EFAULT;
	err  = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
	err |= __put_user(m64->msg_stime, &up64->msg_stime);
	err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
	err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
	err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
	err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
	err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
	err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
	err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
	return err;
}

static inline int put_compat_msqid_ds(struct msqid64_ds *m,
				      struct compat_msqid_ds __user *up)
{
	int err;

	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
		return -EFAULT;
	err  = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
	err |= __put_user(m->msg_stime, &up->msg_stime);
	err |= __put_user(m->msg_rtime, &up->msg_rtime);
	err |= __put_user(m->msg_ctime, &up->msg_ctime);
	err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
	err |= __put_user(m->msg_qnum, &up->msg_qnum);
	err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
	err |= __put_user(m->msg_lspid, &up->msg_lspid);
	err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
	return err;
}

COMPAT_SYSCALL_DEFINE3(msgctl, int, first, int, second, void __user *, uptr)
{
	int err, err2;
	struct msqid64_ds m64;
	int version = __compat_ipc_parse_version(&second);
	void __user *p;

	memset(&m64, 0, sizeof(m64));

	switch (second & (~IPC_64)) {
	case IPC_INFO:
	case IPC_RMID:
	case MSG_INFO:
		err = sys_msgctl(first, second, uptr);
		break;

	case IPC_SET:
		if (version == IPC_64)
			err = get_compat_msqid64(&m64, uptr);
		else
			err = get_compat_msqid(&m64, uptr);

		if (err)
			break;
		p = compat_alloc_user_space(sizeof(m64));
		if (copy_to_user(p, &m64, sizeof(m64)))
			err = -EFAULT;
		else
			err = sys_msgctl(first, second, p);
		break;

	case IPC_STAT:
	case MSG_STAT:
		p = compat_alloc_user_space(sizeof(m64));
		err = sys_msgctl(first, second, p);
		if (err < 0)
			break;
		if (copy_from_user(&m64, p, sizeof(m64)))
			err2 = -EFAULT;
		else if (version == IPC_64)
			err2 = put_compat_msqid64_ds(&m64, uptr);
		else
			err2 = put_compat_msqid_ds(&m64, uptr);
		if (err2)
			err = -EFAULT;
		break;

	default:
		err = -EINVAL;
		break;
	}
	return err;
}

COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
{
	unsigned long ret;
	long err;

	err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
	if (err)
		return err;
	force_successful_syscall_return();
	return (long)ret;
}

COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
		       unsigned, nsops,
		       const struct compat_timespec __user *, timeout)
{
	struct timespec __user *ts64;
	if (compat_convert_timespec(&ts64, timeout))
		return -EFAULT;
	return sys_semtimedop(semid, tsems, nsops, ts64);
}