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vhost_set_vring(): turn pollstart/pollstop into bool
[linux-2.6-block.git] / net / compat.c
CommitLineData
4768fbcb 1/*
1da177e4
LT		 2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
3 *
4 * Copyright (C) 2000 VA Linux Co
5 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
6 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
9 * Copyright (C) 2000 Hewlett-Packard Co.
10 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
4768fbcb 11 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs
1da177e4
LT		 12 */
13
14#include <linux/kernel.h>
5a0e3ad6 15#include <linux/gfp.h>
1da177e4 16#include <linux/fs.h>
1da177e4
LT		 17#include <linux/types.h>
18#include <linux/file.h>
19#include <linux/icmpv6.h>
20#include <linux/socket.h>
21#include <linux/syscalls.h>
22#include <linux/filter.h>
23#include <linux/compat.h>
1da177e4 24#include <linux/security.h>
bc3b2d7f 25#include <linux/export.h>
1da177e4
LT		 26
27#include <net/scm.h>
28#include <net/sock.h>
dae50295
DS		 29#include <net/ip.h>
30#include <net/ipv6.h>
1da177e4
LT		 31#include <asm/uaccess.h>
32#include <net/compat.h>
33
34static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
35 struct compat_iovec __user *uiov32,
36 int niov)
37{
38 int tot_len = 0;
39
e71a4783 40 while (niov > 0) {
1da177e4
LT		 41 compat_uptr_t buf;
42 compat_size_t len;
43
e71a4783 44 if (get_user(len, &uiov32->iov_len) ||
8acfe468
DM		 45 get_user(buf, &uiov32->iov_base))
46 return -EFAULT;
47
48 if (len > INT_MAX - tot_len)
49 len = INT_MAX - tot_len;
50
1da177e4
LT		 51 tot_len += len;
52 kiov->iov_base = compat_ptr(buf);
53 kiov->iov_len = (__kernel_size_t) len;
54 uiov32++;
55 kiov++;
56 niov--;
57 }
58 return tot_len;
59}
60
61int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
62{
63 compat_uptr_t tmp1, tmp2, tmp3;
64
65 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
66 __get_user(tmp1, &umsg->msg_name) ||
67 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
68 __get_user(tmp2, &umsg->msg_iov) ||
69 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
70 __get_user(tmp3, &umsg->msg_control) ||
71 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
72 __get_user(kmsg->msg_flags, &umsg->msg_flags))
73 return -EFAULT;
74 kmsg->msg_name = compat_ptr(tmp1);
75 kmsg->msg_iov = compat_ptr(tmp2);
76 kmsg->msg_control = compat_ptr(tmp3);
77 return 0;
78}
79
80/* I've named the args so it is easy to tell whose space the pointers are in. */
81int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
43db362d 82 struct sockaddr_storage *kern_address, int mode)
1da177e4
LT		 83{
84 int tot_len;
85
e71a4783 86 if (kern_msg->msg_namelen) {
c6d409cf 87 if (mode == VERIFY_READ) {
1da177e4
LT		 88 int err = move_addr_to_kernel(kern_msg->msg_name,
89 kern_msg->msg_namelen,
90 kern_address);
e71a4783 91 if (err < 0)
1da177e4
LT		 92 return err;
93 }
94 kern_msg->msg_name = kern_address;
95 } else
96 kern_msg->msg_name = NULL;
97
1da177e4
LT		 98 tot_len = iov_from_user_compat_to_kern(kern_iov,
99 (struct compat_iovec __user *)kern_msg->msg_iov,
100 kern_msg->msg_iovlen);
e71a4783 101 if (tot_len >= 0)
1da177e4 102 kern_msg->msg_iov = kern_iov;
1da177e4
LT		 103
104 return tot_len;
105}
106
107/* Bleech... */
108#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
109
110#define CMSG_COMPAT_DATA(cmsg) \
111 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
112#define CMSG_COMPAT_SPACE(len) \
113 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
114#define CMSG_COMPAT_LEN(len) \
115 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
116
117#define CMSG_COMPAT_FIRSTHDR(msg) \
118 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
119 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
120 (struct compat_cmsghdr __user *)NULL)
121
122#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
123 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
124 (ucmlen) <= (unsigned long) \
125 ((mhdr)->msg_controllen - \
126 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
127
128static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
129 struct compat_cmsghdr __user *cmsg, int cmsg_len)
130{
131 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
132 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
133 msg->msg_controllen)
134 return NULL;
135 return (struct compat_cmsghdr __user *)ptr;
136}
137
138/* There is a lot of hair here because the alignment rules (and
139 * thus placement) of cmsg headers and length are different for
140 * 32-bit apps. -DaveM
141 */
8920e8f9 142int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
1da177e4
LT		 143 unsigned char *stackbuf, int stackbuf_size)
144{
145 struct compat_cmsghdr __user *ucmsg;
146 struct cmsghdr *kcmsg, *kcmsg_base;
147 compat_size_t ucmlen;
148 __kernel_size_t kcmlen, tmp;
8920e8f9 149 int err = -EFAULT;
1da177e4
LT		 150
151 kcmlen = 0;
152 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
153 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
e71a4783
SH		 154 while (ucmsg != NULL) {
155 if (get_user(ucmlen, &ucmsg->cmsg_len))
1da177e4
LT		 156 return -EFAULT;
157
158 /* Catch bogons. */
159 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
160 return -EINVAL;
161
162 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
163 CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9 164 tmp = CMSG_ALIGN(tmp);
1da177e4
LT		 165 kcmlen += tmp;
166 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
167 }
e71a4783 168 if (kcmlen == 0)
1da177e4
LT		 169 return -EINVAL;
170
171 /* The kcmlen holds the 64-bit version of the control length.
172 * It may not be modified as we do not stick it into the kmsg
173 * until we have successfully copied over all of the data
174 * from the user.
175 */
8920e8f9
AV		 176 if (kcmlen > stackbuf_size)
177 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
178 if (kcmsg == NULL)
1da177e4
LT		 179 return -ENOBUFS;
180
181 /* Now copy them over neatly. */
182 memset(kcmsg, 0, kcmlen);
183 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
e71a4783 184 while (ucmsg != NULL) {
8920e8f9
AV		 185 if (__get_user(ucmlen, &ucmsg->cmsg_len))
186 goto Efault;
187 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
188 goto Einval;
1da177e4
LT		 189 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
190 CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9
AV		 191 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
192 goto Einval;
1da177e4 193 kcmsg->cmsg_len = tmp;
8920e8f9
AV		 194 tmp = CMSG_ALIGN(tmp);
195 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
196 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
197 copy_from_user(CMSG_DATA(kcmsg),
198 CMSG_COMPAT_DATA(ucmsg),
199 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
200 goto Efault;
1da177e4
LT		 201
202 /* Advance. */
8920e8f9 203 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
1da177e4
LT		 204 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
205 }
206
207 /* Ok, looks like we made it. Hook it up and return success. */
208 kmsg->msg_control = kcmsg_base;
209 kmsg->msg_controllen = kcmlen;
210 return 0;
211
8920e8f9
AV		 212Einval:
213 err = -EINVAL;
214Efault:
215 if (kcmsg_base != (struct cmsghdr *)stackbuf)
216 sock_kfree_s(sk, kcmsg_base, kcmlen);
217 return err;
1da177e4
LT		 218}
219
220int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
221{
1da177e4
LT		 222 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
223 struct compat_cmsghdr cmhdr;
81881047
JJ		 224 struct compat_timeval ctv;
225 struct compat_timespec cts[3];
1da177e4
LT		 226 int cmlen;
227
e71a4783 228 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
1da177e4
LT		 229 kmsg->msg_flags |= MSG_CTRUNC;
230 return 0; /* XXX: return error? check spec. */
231 }
232
ee4fa23c 233 if (!COMPAT_USE_64BIT_TIME) {
ee4fa23c
L		 234 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
235 struct timeval *tv = (struct timeval *)data;
236 ctv.tv_sec = tv->tv_sec;
237 ctv.tv_usec = tv->tv_usec;
238 data = &ctv;
239 len = sizeof(ctv);
240 }
241 if (level == SOL_SOCKET &&
242 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
243 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
244 int i;
245 struct timespec *ts = (struct timespec *)data;
246 for (i = 0; i < count; i++) {
247 cts[i].tv_sec = ts[i].tv_sec;
248 cts[i].tv_nsec = ts[i].tv_nsec;
249 }
250 data = &cts;
251 len = sizeof(cts[0]) * count;
20d49473 252 }
4768fbcb
YH		 253 }
254
1da177e4 255 cmlen = CMSG_COMPAT_LEN(len);
e71a4783 256 if (kmsg->msg_controllen < cmlen) {
1da177e4
LT		 257 kmsg->msg_flags |= MSG_CTRUNC;
258 cmlen = kmsg->msg_controllen;
259 }
260 cmhdr.cmsg_level = level;
261 cmhdr.cmsg_type = type;
262 cmhdr.cmsg_len = cmlen;
263
e71a4783 264 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
1da177e4 265 return -EFAULT;
e71a4783 266 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
1da177e4
LT		 267 return -EFAULT;
268 cmlen = CMSG_COMPAT_SPACE(len);
1ac70e7a
WY		 269 if (kmsg->msg_controllen < cmlen)
270 cmlen = kmsg->msg_controllen;
1da177e4
LT		 271 kmsg->msg_control += cmlen;
272 kmsg->msg_controllen -= cmlen;
273 return 0;
274}
275
276void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
277{
278 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
279 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
280 int fdnum = scm->fp->count;
281 struct file **fp = scm->fp->fp;
282 int __user *cmfptr;
283 int err = 0, i;
284
285 if (fdnum < fdmax)
286 fdmax = fdnum;
287
288 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
289 int new_fd;
290 err = security_file_receive(fp[i]);
291 if (err)
292 break;
4a19542e
UD		 293 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
294 ? O_CLOEXEC : 0);
1da177e4
LT		 295 if (err < 0)
296 break;
297 new_fd = err;
298 err = put_user(new_fd, cmfptr);
299 if (err) {
300 put_unused_fd(new_fd);
301 break;
302 }
303 /* Bump the usage count and install the file. */
304 get_file(fp[i]);
305 fd_install(new_fd, fp[i]);
306 }
307
308 if (i > 0) {
309 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
effee6a0 310 err = put_user(SOL_SOCKET, &cm->cmsg_level);
1da177e4
LT		 311 if (!err)
312 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
313 if (!err)
314 err = put_user(cmlen, &cm->cmsg_len);
315 if (!err) {
316 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
317 kmsg->msg_control += cmlen;
318 kmsg->msg_controllen -= cmlen;
319 }
320 }
321 if (i < fdnum)
322 kmsg->msg_flags |= MSG_CTRUNC;
323
324 /*
325 * All of the files that fit in the message have had their
326 * usage counts incremented, so we just free the list.
327 */
328 __scm_destroy(scm);
329}
330
3fdadf7d 331static int do_set_attach_filter(struct socket *sock, int level, int optname,
b7058842 332 char __user *optval, unsigned int optlen)
1da177e4
LT		 333{
334 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
4768fbcb 335 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
1da177e4
LT		 336 compat_uptr_t ptr;
337 u16 len;
338
339 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
340 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
341 __get_user(len, &fprog32->len) ||
342 __get_user(ptr, &fprog32->filter) ||
343 __put_user(len, &kfprog->len) ||
344 __put_user(compat_ptr(ptr), &kfprog->filter))
345 return -EFAULT;
346
3fdadf7d 347 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
1da177e4
LT		 348 sizeof(struct sock_fprog));
349}
350
3fdadf7d 351static int do_set_sock_timeout(struct socket *sock, int level,
b7058842 352 int optname, char __user *optval, unsigned int optlen)
1da177e4 353{
c6d409cf 354 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
1da177e4
LT		 355 struct timeval ktime;
356 mm_segment_t old_fs;
357 int err;
358
359 if (optlen < sizeof(*up))
360 return -EINVAL;
361 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
362 __get_user(ktime.tv_sec, &up->tv_sec) ||
363 __get_user(ktime.tv_usec, &up->tv_usec))
364 return -EFAULT;
365 old_fs = get_fs();
366 set_fs(KERNEL_DS);
c6d409cf 367 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
1da177e4
LT		 368 set_fs(old_fs);
369
370 return err;
371}
372
3fdadf7d 373static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 374 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 375{
376 if (optname == SO_ATTACH_FILTER)
377 return do_set_attach_filter(sock, level, optname,
378 optval, optlen);
379 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
380 return do_set_sock_timeout(sock, level, optname, optval, optlen);
381
382 return sock_setsockopt(sock, level, optname, optval, optlen);
383}
384
1da177e4 385asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
b7058842 386 char __user *optval, unsigned int optlen)
1da177e4 387{
3fdadf7d 388 int err;
c6d409cf 389 struct socket *sock = sockfd_lookup(fd, &err);
3fdadf7d 390
c6d409cf
ED		 391 if (sock) {
392 err = security_socket_setsockopt(sock, level, optname);
3fdadf7d
DM		 393 if (err) {
394 sockfd_put(sock);
395 return err;
396 }
397
398 if (level == SOL_SOCKET)
399 err = compat_sock_setsockopt(sock, level,
400 optname, optval, optlen);
401 else if (sock->ops->compat_setsockopt)
402 err = sock->ops->compat_setsockopt(sock, level,
403 optname, optval, optlen);
404 else
405 err = sock->ops->setsockopt(sock, level,
406 optname, optval, optlen);
407 sockfd_put(sock);
408 }
409 return err;
1da177e4
LT		 410}
411
3fdadf7d 412static int do_get_sock_timeout(struct socket *sock, int level, int optname,
1da177e4
LT		 413 char __user *optval, int __user *optlen)
414{
415 struct compat_timeval __user *up;
416 struct timeval ktime;
417 mm_segment_t old_fs;
418 int len, err;
419
420 up = (struct compat_timeval __user *) optval;
421 if (get_user(len, optlen))
422 return -EFAULT;
423 if (len < sizeof(*up))
424 return -EINVAL;
425 len = sizeof(ktime);
426 old_fs = get_fs();
427 set_fs(KERNEL_DS);
3fdadf7d 428 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
1da177e4
LT		 429 set_fs(old_fs);
430
431 if (!err) {
432 if (put_user(sizeof(*up), optlen) ||
433 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
434 __put_user(ktime.tv_sec, &up->tv_sec) ||
435 __put_user(ktime.tv_usec, &up->tv_usec))
436 err = -EFAULT;
437 }
438 return err;
439}
440
3fdadf7d 441static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
1da177e4
LT		 442 char __user *optval, int __user *optlen)
443{
3fdadf7d
DM		 444 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
445 return do_get_sock_timeout(sock, level, optname, optval, optlen);
446 return sock_getsockopt(sock, level, optname, optval, optlen);
1da177e4
LT		 447}
448
f0ac2614
SP		 449int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
450{
ee4fa23c
L		 451 struct compat_timeval __user *ctv;
452 int err;
b7aa0bf7 453 struct timeval tv;
f0ac2614 454
ee4fa23c
L		 455 if (COMPAT_USE_64BIT_TIME)
456 return sock_get_timestamp(sk, userstamp);
457
458 ctv = (struct compat_timeval __user *) userstamp;
459 err = -ENOENT;
f0ac2614 460 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 461 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 462 tv = ktime_to_timeval(sk->sk_stamp);
463 if (tv.tv_sec == -1)
f0ac2614 464 return err;
b7aa0bf7
ED		 465 if (tv.tv_sec == 0) {
466 sk->sk_stamp = ktime_get_real();
467 tv = ktime_to_timeval(sk->sk_stamp);
468 }
469 err = 0;
470 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
471 put_user(tv.tv_usec, &ctv->tv_usec))
f0ac2614
SP		 472 err = -EFAULT;
473 return err;
474}
475EXPORT_SYMBOL(compat_sock_get_timestamp);
476
ae40eb1e
ED		 477int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
478{
ee4fa23c
L		 479 struct compat_timespec __user *ctv;
480 int err;
ae40eb1e
ED		 481 struct timespec ts;
482
ee4fa23c
L		 483 if (COMPAT_USE_64BIT_TIME)
484 return sock_get_timestampns (sk, userstamp);
485
486 ctv = (struct compat_timespec __user *) userstamp;
487 err = -ENOENT;
ae40eb1e 488 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 489 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 490 ts = ktime_to_timespec(sk->sk_stamp);
491 if (ts.tv_sec == -1)
492 return err;
493 if (ts.tv_sec == 0) {
494 sk->sk_stamp = ktime_get_real();
495 ts = ktime_to_timespec(sk->sk_stamp);
496 }
497 err = 0;
498 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
499 put_user(ts.tv_nsec, &ctv->tv_nsec))
500 err = -EFAULT;
501 return err;
502}
503EXPORT_SYMBOL(compat_sock_get_timestampns);
504
3fdadf7d
DM		 505asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
506 char __user *optval, int __user *optlen)
507{
508 int err;
c6d409cf 509 struct socket *sock = sockfd_lookup(fd, &err);
3fdadf7d 510
c6d409cf
ED		 511 if (sock) {
512 err = security_socket_getsockopt(sock, level, optname);
3fdadf7d
DM		 513 if (err) {
514 sockfd_put(sock);
515 return err;
516 }
517
518 if (level == SOL_SOCKET)
519 err = compat_sock_getsockopt(sock, level,
520 optname, optval, optlen);
521 else if (sock->ops->compat_getsockopt)
522 err = sock->ops->compat_getsockopt(sock, level,
523 optname, optval, optlen);
524 else
525 err = sock->ops->getsockopt(sock, level,
526 optname, optval, optlen);
527 sockfd_put(sock);
528 }
529 return err;
530}
dae50295
DS		 531
532struct compat_group_req {
533 __u32 gr_interface;
534 struct __kernel_sockaddr_storage gr_group
535 __attribute__ ((aligned(4)));
bc10502d 536} __packed;
dae50295
DS		 537
538struct compat_group_source_req {
539 __u32 gsr_interface;
540 struct __kernel_sockaddr_storage gsr_group
541 __attribute__ ((aligned(4)));
542 struct __kernel_sockaddr_storage gsr_source
543 __attribute__ ((aligned(4)));
bc10502d 544} __packed;
dae50295
DS		 545
546struct compat_group_filter {
547 __u32 gf_interface;
548 struct __kernel_sockaddr_storage gf_group
549 __attribute__ ((aligned(4)));
550 __u32 gf_fmode;
551 __u32 gf_numsrc;
552 struct __kernel_sockaddr_storage gf_slist[1]
553 __attribute__ ((aligned(4)));
bc10502d 554} __packed;
dae50295 555
be666e0a
DS		 556#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
557 sizeof(struct __kernel_sockaddr_storage))
558
dae50295
DS		 559
560int compat_mc_setsockopt(struct sock *sock, int level, int optname,
b7058842 561 char __user *optval, unsigned int optlen,
c6d409cf 562 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
dae50295
DS		 563{
564 char __user *koptval = optval;
565 int koptlen = optlen;
566
567 switch (optname) {
568 case MCAST_JOIN_GROUP:
569 case MCAST_LEAVE_GROUP:
570 {
571 struct compat_group_req __user *gr32 = (void *)optval;
572 struct group_req __user *kgr =
573 compat_alloc_user_space(sizeof(struct group_req));
574 u32 interface;
575
576 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
577 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
578 __get_user(interface, &gr32->gr_interface) ||
579 __put_user(interface, &kgr->gr_interface) ||
580 copy_in_user(&kgr->gr_group, &gr32->gr_group,
581 sizeof(kgr->gr_group)))
582 return -EFAULT;
583 koptval = (char __user *)kgr;
584 koptlen = sizeof(struct group_req);
585 break;
586 }
587 case MCAST_JOIN_SOURCE_GROUP:
588 case MCAST_LEAVE_SOURCE_GROUP:
589 case MCAST_BLOCK_SOURCE:
590 case MCAST_UNBLOCK_SOURCE:
591 {
592 struct compat_group_source_req __user *gsr32 = (void *)optval;
be666e0a 593 struct group_source_req __user *kgsr = compat_alloc_user_space(
dae50295
DS		 594 sizeof(struct group_source_req));
595 u32 interface;
596
597 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
598 !access_ok(VERIFY_WRITE, kgsr,
599 sizeof(struct group_source_req)) ||
600 __get_user(interface, &gsr32->gsr_interface) ||
601 __put_user(interface, &kgsr->gsr_interface) ||
602 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
603 sizeof(kgsr->gsr_group)) ||
604 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
605 sizeof(kgsr->gsr_source)))
606 return -EFAULT;
607 koptval = (char __user *)kgsr;
608 koptlen = sizeof(struct group_source_req);
609 break;
610 }
611 case MCAST_MSFILTER:
612 {
613 struct compat_group_filter __user *gf32 = (void *)optval;
be666e0a 614 struct group_filter __user *kgf;
dae50295
DS		 615 u32 interface, fmode, numsrc;
616
be666e0a 617 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
dae50295
DS		 618 __get_user(interface, &gf32->gf_interface) ||
619 __get_user(fmode, &gf32->gf_fmode) ||
620 __get_user(numsrc, &gf32->gf_numsrc))
621 return -EFAULT;
622 koptlen = optlen + sizeof(struct group_filter) -
623 sizeof(struct compat_group_filter);
624 if (koptlen < GROUP_FILTER_SIZE(numsrc))
625 return -EINVAL;
626 kgf = compat_alloc_user_space(koptlen);
627 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
628 __put_user(interface, &kgf->gf_interface) ||
629 __put_user(fmode, &kgf->gf_fmode) ||
630 __put_user(numsrc, &kgf->gf_numsrc) ||
631 copy_in_user(&kgf->gf_group, &gf32->gf_group,
632 sizeof(kgf->gf_group)) ||
be666e0a 633 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
dae50295
DS		 634 numsrc * sizeof(kgf->gf_slist[0]))))
635 return -EFAULT;
636 koptval = (char __user *)kgf;
637 break;
638 }
639
640 default:
641 break;
642 }
643 return setsockopt(sock, level, optname, koptval, koptlen);
644}
dae50295
DS		 645EXPORT_SYMBOL(compat_mc_setsockopt);
646
42908c69
DS		 647int compat_mc_getsockopt(struct sock *sock, int level, int optname,
648 char __user *optval, int __user *optlen,
c6d409cf 649 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
42908c69
DS		 650{
651 struct compat_group_filter __user *gf32 = (void *)optval;
652 struct group_filter __user *kgf;
653 int __user *koptlen;
654 u32 interface, fmode, numsrc;
655 int klen, ulen, err;
656
657 if (optname != MCAST_MSFILTER)
658 return getsockopt(sock, level, optname, optval, optlen);
659
660 koptlen = compat_alloc_user_space(sizeof(*koptlen));
661 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
662 __get_user(ulen, optlen))
663 return -EFAULT;
664
665 /* adjust len for pad */
666 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
667
668 if (klen < GROUP_FILTER_SIZE(0))
669 return -EINVAL;
670
671 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
672 __put_user(klen, koptlen))
673 return -EFAULT;
674
675 /* have to allow space for previous compat_alloc_user_space, too */
676 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
677
678 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
679 __get_user(interface, &gf32->gf_interface) ||
680 __get_user(fmode, &gf32->gf_fmode) ||
681 __get_user(numsrc, &gf32->gf_numsrc) ||
682 __put_user(interface, &kgf->gf_interface) ||
683 __put_user(fmode, &kgf->gf_fmode) ||
684 __put_user(numsrc, &kgf->gf_numsrc) ||
c6d409cf 685 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
42908c69
DS		 686 return -EFAULT;
687
688 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
689 if (err)
690 return err;
691
692 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
693 __get_user(klen, koptlen))
694 return -EFAULT;
695
696 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
697
698 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
699 __put_user(ulen, optlen))
700 return -EFAULT;
701
702 if (!access_ok(VERIFY_READ, kgf, klen) ||
703 !access_ok(VERIFY_WRITE, gf32, ulen) ||
704 __get_user(interface, &kgf->gf_interface) ||
705 __get_user(fmode, &kgf->gf_fmode) ||
706 __get_user(numsrc, &kgf->gf_numsrc) ||
707 __put_user(interface, &gf32->gf_interface) ||
708 __put_user(fmode, &gf32->gf_fmode) ||
709 __put_user(numsrc, &gf32->gf_numsrc))
710 return -EFAULT;
711 if (numsrc) {
712 int copylen;
713
714 klen -= GROUP_FILTER_SIZE(0);
715 copylen = numsrc * sizeof(gf32->gf_slist[0]);
716 if (copylen > klen)
717 copylen = klen;
c6d409cf 718 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
42908c69
DS		 719 return -EFAULT;
720 }
721 return err;
722}
42908c69
DS		 723EXPORT_SYMBOL(compat_mc_getsockopt);
724
dae50295 725
1da177e4
LT		 726/* Argument list sizes for compat_sys_socketcall */
727#define AL(x) ((x) * sizeof(u32))
228e548e 728static unsigned char nas[21] = {
c6d409cf
ED		 729 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
730 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
731 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
228e548e 732 AL(4), AL(5), AL(4)
c6d409cf 733};
1da177e4
LT		 734#undef AL
735
95c96174 736asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
1da177e4
LT		 737{
738 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
739}
740
228e548e 741asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
95c96174 742 unsigned int vlen, unsigned int flags)
228e548e
AB		 743{
744 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
745 flags | MSG_CMSG_COMPAT);
746}
747
1da177e4
LT		 748asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
749{
750 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
751}
752
95c96174 753asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
1dacc76d
JB		 754{
755 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
756}
757
758asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
95c96174 759 unsigned int flags, struct sockaddr __user *addr,
1dacc76d
JB		 760 int __user *addrlen)
761{
762 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
763}
764
a2e27255 765asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
95c96174 766 unsigned int vlen, unsigned int flags,
60c2ffd3 767 struct compat_timespec __user *timeout)
a2e27255
ACM		 768{
769 int datagrams;
770 struct timespec ktspec;
a2e27255 771
ee4fa23c
L		 772 if (COMPAT_USE_64BIT_TIME)
773 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
774 flags | MSG_CMSG_COMPAT,
775 (struct timespec *) timeout);
776
5b23136b
JMG		 777 if (timeout == NULL)
778 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
779 flags | MSG_CMSG_COMPAT, NULL);
780
de039f02 781 if (get_compat_timespec(&ktspec, timeout))
a2e27255
ACM		 782 return -EFAULT;
783
784 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
785 flags | MSG_CMSG_COMPAT, &ktspec);
de039f02 786 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
a2e27255
ACM		 787 datagrams = -EFAULT;
788
789 return datagrams;
790}
791
1da177e4
LT		 792asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
793{
794 int ret;
795 u32 a[6];
796 u32 a0, a1;
4768fbcb 797
228e548e 798 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
1da177e4
LT		 799 return -EINVAL;
800 if (copy_from_user(a, args, nas[call]))
801 return -EFAULT;
802 a0 = a[0];
803 a1 = a[1];
4768fbcb 804
e71a4783 805 switch (call) {
1da177e4
LT		 806 case SYS_SOCKET:
807 ret = sys_socket(a0, a1, a[2]);
808 break;
809 case SYS_BIND:
810 ret = sys_bind(a0, compat_ptr(a1), a[2]);
811 break;
812 case SYS_CONNECT:
813 ret = sys_connect(a0, compat_ptr(a1), a[2]);
814 break;
815 case SYS_LISTEN:
816 ret = sys_listen(a0, a1);
817 break;
818 case SYS_ACCEPT:
de11defe 819 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
1da177e4
LT		 820 break;
821 case SYS_GETSOCKNAME:
822 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
823 break;
824 case SYS_GETPEERNAME:
825 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
826 break;
827 case SYS_SOCKETPAIR:
828 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
829 break;
830 case SYS_SEND:
831 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
832 break;
833 case SYS_SENDTO:
834 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
835 break;
836 case SYS_RECV:
1dacc76d 837 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
1da177e4
LT		 838 break;
839 case SYS_RECVFROM:
1dacc76d
JB		 840 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
841 compat_ptr(a[4]), compat_ptr(a[5]));
1da177e4
LT		 842 break;
843 case SYS_SHUTDOWN:
c6d409cf 844 ret = sys_shutdown(a0, a1);
1da177e4
LT		 845 break;
846 case SYS_SETSOCKOPT:
847 ret = compat_sys_setsockopt(a0, a1, a[2],
848 compat_ptr(a[3]), a[4]);
849 break;
850 case SYS_GETSOCKOPT:
851 ret = compat_sys_getsockopt(a0, a1, a[2],
852 compat_ptr(a[3]), compat_ptr(a[4]));
853 break;
854 case SYS_SENDMSG:
855 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
856 break;
228e548e
AB		 857 case SYS_SENDMMSG:
858 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
859 break;
1da177e4
LT		 860 case SYS_RECVMSG:
861 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
862 break;
a2e27255
ACM		 863 case SYS_RECVMMSG:
864 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
865 compat_ptr(a[4]));
866 break;
de11defe
UD		 867 case SYS_ACCEPT4:
868 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
aaca0bdc 869 break;
1da177e4
LT		 870 default:
871 ret = -EINVAL;
872 break;
873 }
874 return ret;
875}
Linux 6.x block layer and io_uring tree(s)