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Merge commit 'kumar/merge' into merge
[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
LT		 24#include <linux/security.h>
25
26#include <net/scm.h>
27#include <net/sock.h>
dae50295
DS		 28#include <net/ip.h>
29#include <net/ipv6.h>
1da177e4
LT		 30#include <asm/uaccess.h>
31#include <net/compat.h>
32
33static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
34 struct compat_iovec __user *uiov32,
35 int niov)
36{
37 int tot_len = 0;
38
e71a4783 39 while (niov > 0) {
1da177e4
LT		 40 compat_uptr_t buf;
41 compat_size_t len;
42
e71a4783 43 if (get_user(len, &uiov32->iov_len) ||
1da177e4
LT		 44 get_user(buf, &uiov32->iov_base)) {
45 tot_len = -EFAULT;
46 break;
47 }
48 tot_len += len;
49 kiov->iov_base = compat_ptr(buf);
50 kiov->iov_len = (__kernel_size_t) len;
51 uiov32++;
52 kiov++;
53 niov--;
54 }
55 return tot_len;
56}
57
58int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
59{
60 compat_uptr_t tmp1, tmp2, tmp3;
61
62 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
63 __get_user(tmp1, &umsg->msg_name) ||
64 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
65 __get_user(tmp2, &umsg->msg_iov) ||
66 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
67 __get_user(tmp3, &umsg->msg_control) ||
68 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
69 __get_user(kmsg->msg_flags, &umsg->msg_flags))
70 return -EFAULT;
71 kmsg->msg_name = compat_ptr(tmp1);
72 kmsg->msg_iov = compat_ptr(tmp2);
73 kmsg->msg_control = compat_ptr(tmp3);
74 return 0;
75}
76
77/* I've named the args so it is easy to tell whose space the pointers are in. */
78int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
230b1839 79 struct sockaddr *kern_address, int mode)
1da177e4
LT		 80{
81 int tot_len;
82
e71a4783
SH		 83 if (kern_msg->msg_namelen) {
84 if (mode==VERIFY_READ) {
1da177e4
LT		 85 int err = move_addr_to_kernel(kern_msg->msg_name,
86 kern_msg->msg_namelen,
87 kern_address);
e71a4783 88 if (err < 0)
1da177e4
LT		 89 return err;
90 }
91 kern_msg->msg_name = kern_address;
92 } else
93 kern_msg->msg_name = NULL;
94
1da177e4
LT		 95 tot_len = iov_from_user_compat_to_kern(kern_iov,
96 (struct compat_iovec __user *)kern_msg->msg_iov,
97 kern_msg->msg_iovlen);
e71a4783 98 if (tot_len >= 0)
1da177e4 99 kern_msg->msg_iov = kern_iov;
1da177e4
LT		 100
101 return tot_len;
102}
103
104/* Bleech... */
105#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
106
107#define CMSG_COMPAT_DATA(cmsg) \
108 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
109#define CMSG_COMPAT_SPACE(len) \
110 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
111#define CMSG_COMPAT_LEN(len) \
112 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
113
114#define CMSG_COMPAT_FIRSTHDR(msg) \
115 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
116 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
117 (struct compat_cmsghdr __user *)NULL)
118
119#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
120 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
121 (ucmlen) <= (unsigned long) \
122 ((mhdr)->msg_controllen - \
123 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
124
125static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
126 struct compat_cmsghdr __user *cmsg, int cmsg_len)
127{
128 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
129 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
130 msg->msg_controllen)
131 return NULL;
132 return (struct compat_cmsghdr __user *)ptr;
133}
134
135/* There is a lot of hair here because the alignment rules (and
136 * thus placement) of cmsg headers and length are different for
137 * 32-bit apps. -DaveM
138 */
8920e8f9 139int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
1da177e4
LT		 140 unsigned char *stackbuf, int stackbuf_size)
141{
142 struct compat_cmsghdr __user *ucmsg;
143 struct cmsghdr *kcmsg, *kcmsg_base;
144 compat_size_t ucmlen;
145 __kernel_size_t kcmlen, tmp;
8920e8f9 146 int err = -EFAULT;
1da177e4
LT		 147
148 kcmlen = 0;
149 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
150 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
e71a4783
SH		 151 while (ucmsg != NULL) {
152 if (get_user(ucmlen, &ucmsg->cmsg_len))
1da177e4
LT		 153 return -EFAULT;
154
155 /* Catch bogons. */
156 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
157 return -EINVAL;
158
159 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
160 CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9 161 tmp = CMSG_ALIGN(tmp);
1da177e4
LT		 162 kcmlen += tmp;
163 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
164 }
e71a4783 165 if (kcmlen == 0)
1da177e4
LT		 166 return -EINVAL;
167
168 /* The kcmlen holds the 64-bit version of the control length.
169 * It may not be modified as we do not stick it into the kmsg
170 * until we have successfully copied over all of the data
171 * from the user.
172 */
8920e8f9
AV		 173 if (kcmlen > stackbuf_size)
174 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
175 if (kcmsg == NULL)
1da177e4
LT		 176 return -ENOBUFS;
177
178 /* Now copy them over neatly. */
179 memset(kcmsg, 0, kcmlen);
180 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
e71a4783 181 while (ucmsg != NULL) {
8920e8f9
AV		 182 if (__get_user(ucmlen, &ucmsg->cmsg_len))
183 goto Efault;
184 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
185 goto Einval;
1da177e4
LT		 186 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
187 CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9
AV		 188 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
189 goto Einval;
1da177e4 190 kcmsg->cmsg_len = tmp;
8920e8f9
AV		 191 tmp = CMSG_ALIGN(tmp);
192 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
193 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
194 copy_from_user(CMSG_DATA(kcmsg),
195 CMSG_COMPAT_DATA(ucmsg),
196 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
197 goto Efault;
1da177e4
LT		 198
199 /* Advance. */
8920e8f9 200 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
1da177e4
LT		 201 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
202 }
203
204 /* Ok, looks like we made it. Hook it up and return success. */
205 kmsg->msg_control = kcmsg_base;
206 kmsg->msg_controllen = kcmlen;
207 return 0;
208
8920e8f9
AV		 209Einval:
210 err = -EINVAL;
211Efault:
212 if (kcmsg_base != (struct cmsghdr *)stackbuf)
213 sock_kfree_s(sk, kcmsg_base, kcmlen);
214 return err;
1da177e4
LT		 215}
216
217int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
218{
219 struct compat_timeval ctv;
20d49473 220 struct compat_timespec cts[3];
1da177e4
LT		 221 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
222 struct compat_cmsghdr cmhdr;
223 int cmlen;
224
e71a4783 225 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
1da177e4
LT		 226 kmsg->msg_flags |= MSG_CTRUNC;
227 return 0; /* XXX: return error? check spec. */
228 }
229
d35aac10 230 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
1da177e4
LT		 231 struct timeval *tv = (struct timeval *)data;
232 ctv.tv_sec = tv->tv_sec;
233 ctv.tv_usec = tv->tv_usec;
234 data = &ctv;
92f37fd2
ED		 235 len = sizeof(ctv);
236 }
20d49473
PO		 237 if (level == SOL_SOCKET &&
238 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
239 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
240 int i;
92f37fd2 241 struct timespec *ts = (struct timespec *)data;
20d49473
PO		 242 for (i = 0; i < count; i++) {
243 cts[i].tv_sec = ts[i].tv_sec;
244 cts[i].tv_nsec = ts[i].tv_nsec;
245 }
92f37fd2 246 data = &cts;
20d49473 247 len = sizeof(cts[0]) * count;
4768fbcb
YH		 248 }
249
1da177e4 250 cmlen = CMSG_COMPAT_LEN(len);
e71a4783 251 if (kmsg->msg_controllen < cmlen) {
1da177e4
LT		 252 kmsg->msg_flags |= MSG_CTRUNC;
253 cmlen = kmsg->msg_controllen;
254 }
255 cmhdr.cmsg_level = level;
256 cmhdr.cmsg_type = type;
257 cmhdr.cmsg_len = cmlen;
258
e71a4783 259 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
1da177e4 260 return -EFAULT;
e71a4783 261 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
1da177e4
LT		 262 return -EFAULT;
263 cmlen = CMSG_COMPAT_SPACE(len);
1ac70e7a
WY		 264 if (kmsg->msg_controllen < cmlen)
265 cmlen = kmsg->msg_controllen;
1da177e4
LT		 266 kmsg->msg_control += cmlen;
267 kmsg->msg_controllen -= cmlen;
268 return 0;
269}
270
271void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
272{
273 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
274 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
275 int fdnum = scm->fp->count;
276 struct file **fp = scm->fp->fp;
277 int __user *cmfptr;
278 int err = 0, i;
279
280 if (fdnum < fdmax)
281 fdmax = fdnum;
282
283 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
284 int new_fd;
285 err = security_file_receive(fp[i]);
286 if (err)
287 break;
4a19542e
UD		 288 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
289 ? O_CLOEXEC : 0);
1da177e4
LT		 290 if (err < 0)
291 break;
292 new_fd = err;
293 err = put_user(new_fd, cmfptr);
294 if (err) {
295 put_unused_fd(new_fd);
296 break;
297 }
298 /* Bump the usage count and install the file. */
299 get_file(fp[i]);
300 fd_install(new_fd, fp[i]);
301 }
302
303 if (i > 0) {
304 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
effee6a0 305 err = put_user(SOL_SOCKET, &cm->cmsg_level);
1da177e4
LT		 306 if (!err)
307 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
308 if (!err)
309 err = put_user(cmlen, &cm->cmsg_len);
310 if (!err) {
311 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
312 kmsg->msg_control += cmlen;
313 kmsg->msg_controllen -= cmlen;
314 }
315 }
316 if (i < fdnum)
317 kmsg->msg_flags |= MSG_CTRUNC;
318
319 /*
320 * All of the files that fit in the message have had their
321 * usage counts incremented, so we just free the list.
322 */
323 __scm_destroy(scm);
324}
325
1da177e4
LT		 326/*
327 * A struct sock_filter is architecture independent.
328 */
329struct compat_sock_fprog {
330 u16 len;
331 compat_uptr_t filter; /* struct sock_filter * */
332};
333
3fdadf7d 334static int do_set_attach_filter(struct socket *sock, int level, int optname,
b7058842 335 char __user *optval, unsigned int optlen)
1da177e4
LT		 336{
337 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
4768fbcb 338 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
1da177e4
LT		 339 compat_uptr_t ptr;
340 u16 len;
341
342 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
343 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
344 __get_user(len, &fprog32->len) ||
345 __get_user(ptr, &fprog32->filter) ||
346 __put_user(len, &kfprog->len) ||
347 __put_user(compat_ptr(ptr), &kfprog->filter))
348 return -EFAULT;
349
3fdadf7d 350 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
1da177e4
LT		 351 sizeof(struct sock_fprog));
352}
353
3fdadf7d 354static int do_set_sock_timeout(struct socket *sock, int level,
b7058842 355 int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 356{
357 struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
358 struct timeval ktime;
359 mm_segment_t old_fs;
360 int err;
361
362 if (optlen < sizeof(*up))
363 return -EINVAL;
364 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
365 __get_user(ktime.tv_sec, &up->tv_sec) ||
366 __get_user(ktime.tv_usec, &up->tv_usec))
367 return -EFAULT;
368 old_fs = get_fs();
369 set_fs(KERNEL_DS);
3fdadf7d 370 err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
1da177e4
LT		 371 set_fs(old_fs);
372
373 return err;
374}
375
3fdadf7d 376static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 377 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 378{
379 if (optname == SO_ATTACH_FILTER)
380 return do_set_attach_filter(sock, level, optname,
381 optval, optlen);
382 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
383 return do_set_sock_timeout(sock, level, optname, optval, optlen);
384
385 return sock_setsockopt(sock, level, optname, optval, optlen);
386}
387
1da177e4 388asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
b7058842 389 char __user *optval, unsigned int optlen)
1da177e4 390{
3fdadf7d
DM		 391 int err;
392 struct socket *sock;
393
3fdadf7d
DM		 394 if ((sock = sockfd_lookup(fd, &err))!=NULL)
395 {
396 err = security_socket_setsockopt(sock,level,optname);
397 if (err) {
398 sockfd_put(sock);
399 return err;
400 }
401
402 if (level == SOL_SOCKET)
403 err = compat_sock_setsockopt(sock, level,
404 optname, optval, optlen);
405 else if (sock->ops->compat_setsockopt)
406 err = sock->ops->compat_setsockopt(sock, level,
407 optname, optval, optlen);
408 else
409 err = sock->ops->setsockopt(sock, level,
410 optname, optval, optlen);
411 sockfd_put(sock);
412 }
413 return err;
1da177e4
LT		 414}
415
3fdadf7d 416static int do_get_sock_timeout(struct socket *sock, int level, int optname,
1da177e4
LT		 417 char __user *optval, int __user *optlen)
418{
419 struct compat_timeval __user *up;
420 struct timeval ktime;
421 mm_segment_t old_fs;
422 int len, err;
423
424 up = (struct compat_timeval __user *) optval;
425 if (get_user(len, optlen))
426 return -EFAULT;
427 if (len < sizeof(*up))
428 return -EINVAL;
429 len = sizeof(ktime);
430 old_fs = get_fs();
431 set_fs(KERNEL_DS);
3fdadf7d 432 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
1da177e4
LT		 433 set_fs(old_fs);
434
435 if (!err) {
436 if (put_user(sizeof(*up), optlen) ||
437 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
438 __put_user(ktime.tv_sec, &up->tv_sec) ||
439 __put_user(ktime.tv_usec, &up->tv_usec))
440 err = -EFAULT;
441 }
442 return err;
443}
444
3fdadf7d 445static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
1da177e4
LT		 446 char __user *optval, int __user *optlen)
447{
3fdadf7d
DM		 448 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
449 return do_get_sock_timeout(sock, level, optname, optval, optlen);
450 return sock_getsockopt(sock, level, optname, optval, optlen);
1da177e4
LT		 451}
452
f0ac2614
SP		 453int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
454{
455 struct compat_timeval __user *ctv =
456 (struct compat_timeval __user*) userstamp;
457 int err = -ENOENT;
b7aa0bf7 458 struct timeval tv;
f0ac2614
SP		 459
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{
479 struct compat_timespec __user *ctv =
480 (struct compat_timespec __user*) userstamp;
481 int err = -ENOENT;
482 struct timespec ts;
483
484 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 485 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 486 ts = ktime_to_timespec(sk->sk_stamp);
487 if (ts.tv_sec == -1)
488 return err;
489 if (ts.tv_sec == 0) {
490 sk->sk_stamp = ktime_get_real();
491 ts = ktime_to_timespec(sk->sk_stamp);
492 }
493 err = 0;
494 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
495 put_user(ts.tv_nsec, &ctv->tv_nsec))
496 err = -EFAULT;
497 return err;
498}
499EXPORT_SYMBOL(compat_sock_get_timestampns);
500
3fdadf7d
DM		 501asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
502 char __user *optval, int __user *optlen)
503{
504 int err;
505 struct socket *sock;
506
507 if ((sock = sockfd_lookup(fd, &err))!=NULL)
508 {
509 err = security_socket_getsockopt(sock, level,
510 optname);
511 if (err) {
512 sockfd_put(sock);
513 return err;
514 }
515
516 if (level == SOL_SOCKET)
517 err = compat_sock_getsockopt(sock, level,
518 optname, optval, optlen);
519 else if (sock->ops->compat_getsockopt)
520 err = sock->ops->compat_getsockopt(sock, level,
521 optname, optval, optlen);
522 else
523 err = sock->ops->getsockopt(sock, level,
524 optname, optval, optlen);
525 sockfd_put(sock);
526 }
527 return err;
528}
dae50295
DS		 529
530struct compat_group_req {
531 __u32 gr_interface;
532 struct __kernel_sockaddr_storage gr_group
533 __attribute__ ((aligned(4)));
534} __attribute__ ((packed));
535
536struct compat_group_source_req {
537 __u32 gsr_interface;
538 struct __kernel_sockaddr_storage gsr_group
539 __attribute__ ((aligned(4)));
540 struct __kernel_sockaddr_storage gsr_source
541 __attribute__ ((aligned(4)));
542} __attribute__ ((packed));
543
544struct compat_group_filter {
545 __u32 gf_interface;
546 struct __kernel_sockaddr_storage gf_group
547 __attribute__ ((aligned(4)));
548 __u32 gf_fmode;
549 __u32 gf_numsrc;
550 struct __kernel_sockaddr_storage gf_slist[1]
551 __attribute__ ((aligned(4)));
552} __attribute__ ((packed));
553
be666e0a
DS		 554#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
555 sizeof(struct __kernel_sockaddr_storage))
556
dae50295
DS		 557
558int compat_mc_setsockopt(struct sock *sock, int level, int optname,
b7058842
DM		 559 char __user *optval, unsigned int optlen,
560 int (*setsockopt)(struct sock *,int,int,char __user *,unsigned int))
dae50295
DS		 561{
562 char __user *koptval = optval;
563 int koptlen = optlen;
564
565 switch (optname) {
566 case MCAST_JOIN_GROUP:
567 case MCAST_LEAVE_GROUP:
568 {
569 struct compat_group_req __user *gr32 = (void *)optval;
570 struct group_req __user *kgr =
571 compat_alloc_user_space(sizeof(struct group_req));
572 u32 interface;
573
574 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
575 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
576 __get_user(interface, &gr32->gr_interface) ||
577 __put_user(interface, &kgr->gr_interface) ||
578 copy_in_user(&kgr->gr_group, &gr32->gr_group,
579 sizeof(kgr->gr_group)))
580 return -EFAULT;
581 koptval = (char __user *)kgr;
582 koptlen = sizeof(struct group_req);
583 break;
584 }
585 case MCAST_JOIN_SOURCE_GROUP:
586 case MCAST_LEAVE_SOURCE_GROUP:
587 case MCAST_BLOCK_SOURCE:
588 case MCAST_UNBLOCK_SOURCE:
589 {
590 struct compat_group_source_req __user *gsr32 = (void *)optval;
be666e0a 591 struct group_source_req __user *kgsr = compat_alloc_user_space(
dae50295
DS		 592 sizeof(struct group_source_req));
593 u32 interface;
594
595 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
596 !access_ok(VERIFY_WRITE, kgsr,
597 sizeof(struct group_source_req)) ||
598 __get_user(interface, &gsr32->gsr_interface) ||
599 __put_user(interface, &kgsr->gsr_interface) ||
600 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
601 sizeof(kgsr->gsr_group)) ||
602 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
603 sizeof(kgsr->gsr_source)))
604 return -EFAULT;
605 koptval = (char __user *)kgsr;
606 koptlen = sizeof(struct group_source_req);
607 break;
608 }
609 case MCAST_MSFILTER:
610 {
611 struct compat_group_filter __user *gf32 = (void *)optval;
be666e0a 612 struct group_filter __user *kgf;
dae50295
DS		 613 u32 interface, fmode, numsrc;
614
be666e0a 615 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
dae50295
DS		 616 __get_user(interface, &gf32->gf_interface) ||
617 __get_user(fmode, &gf32->gf_fmode) ||
618 __get_user(numsrc, &gf32->gf_numsrc))
619 return -EFAULT;
620 koptlen = optlen + sizeof(struct group_filter) -
621 sizeof(struct compat_group_filter);
622 if (koptlen < GROUP_FILTER_SIZE(numsrc))
623 return -EINVAL;
624 kgf = compat_alloc_user_space(koptlen);
625 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
626 __put_user(interface, &kgf->gf_interface) ||
627 __put_user(fmode, &kgf->gf_fmode) ||
628 __put_user(numsrc, &kgf->gf_numsrc) ||
629 copy_in_user(&kgf->gf_group, &gf32->gf_group,
630 sizeof(kgf->gf_group)) ||
be666e0a 631 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
dae50295
DS		 632 numsrc * sizeof(kgf->gf_slist[0]))))
633 return -EFAULT;
634 koptval = (char __user *)kgf;
635 break;
636 }
637
638 default:
639 break;
640 }
641 return setsockopt(sock, level, optname, koptval, koptlen);
642}
643
644EXPORT_SYMBOL(compat_mc_setsockopt);
645
42908c69
DS		 646int compat_mc_getsockopt(struct sock *sock, int level, int optname,
647 char __user *optval, int __user *optlen,
648 int (*getsockopt)(struct sock *,int,int,char __user *,int __user *))
649{
650 struct compat_group_filter __user *gf32 = (void *)optval;
651 struct group_filter __user *kgf;
652 int __user *koptlen;
653 u32 interface, fmode, numsrc;
654 int klen, ulen, err;
655
656 if (optname != MCAST_MSFILTER)
657 return getsockopt(sock, level, optname, optval, optlen);
658
659 koptlen = compat_alloc_user_space(sizeof(*koptlen));
660 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
661 __get_user(ulen, optlen))
662 return -EFAULT;
663
664 /* adjust len for pad */
665 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
666
667 if (klen < GROUP_FILTER_SIZE(0))
668 return -EINVAL;
669
670 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
671 __put_user(klen, koptlen))
672 return -EFAULT;
673
674 /* have to allow space for previous compat_alloc_user_space, too */
675 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
676
677 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
678 __get_user(interface, &gf32->gf_interface) ||
679 __get_user(fmode, &gf32->gf_fmode) ||
680 __get_user(numsrc, &gf32->gf_numsrc) ||
681 __put_user(interface, &kgf->gf_interface) ||
682 __put_user(fmode, &kgf->gf_fmode) ||
683 __put_user(numsrc, &kgf->gf_numsrc) ||
684 copy_in_user(&kgf->gf_group,&gf32->gf_group,sizeof(kgf->gf_group)))
685 return -EFAULT;
686
687 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
688 if (err)
689 return err;
690
691 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
692 __get_user(klen, koptlen))
693 return -EFAULT;
694
695 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
696
697 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
698 __put_user(ulen, optlen))
699 return -EFAULT;
700
701 if (!access_ok(VERIFY_READ, kgf, klen) ||
702 !access_ok(VERIFY_WRITE, gf32, ulen) ||
703 __get_user(interface, &kgf->gf_interface) ||
704 __get_user(fmode, &kgf->gf_fmode) ||
705 __get_user(numsrc, &kgf->gf_numsrc) ||
706 __put_user(interface, &gf32->gf_interface) ||
707 __put_user(fmode, &gf32->gf_fmode) ||
708 __put_user(numsrc, &gf32->gf_numsrc))
709 return -EFAULT;
710 if (numsrc) {
711 int copylen;
712
713 klen -= GROUP_FILTER_SIZE(0);
714 copylen = numsrc * sizeof(gf32->gf_slist[0]);
715 if (copylen > klen)
716 copylen = klen;
717 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
718 return -EFAULT;
719 }
720 return err;
721}
722
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))
a2e27255 728static unsigned char nas[20]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
1da177e4 729 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
aaca0bdc 730 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3),
a2e27255 731 AL(4),AL(5)};
1da177e4
LT		 732#undef AL
733
734asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
735{
736 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
737}
738
739asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
740{
741 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
742}
743
1dacc76d
JB		 744asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags)
745{
746 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
747}
748
749asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
750 unsigned flags, struct sockaddr __user *addr,
751 int __user *addrlen)
752{
753 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
754}
755
a2e27255
ACM		 756asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
757 unsigned vlen, unsigned int flags,
60c2ffd3 758 struct compat_timespec __user *timeout)
a2e27255
ACM		 759{
760 int datagrams;
761 struct timespec ktspec;
a2e27255 762
5b23136b
JMG		 763 if (timeout == NULL)
764 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
765 flags | MSG_CMSG_COMPAT, NULL);
766
de039f02 767 if (get_compat_timespec(&ktspec, timeout))
a2e27255
ACM		 768 return -EFAULT;
769
770 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
771 flags | MSG_CMSG_COMPAT, &ktspec);
de039f02 772 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
a2e27255
ACM		 773 datagrams = -EFAULT;
774
775 return datagrams;
776}
777
1da177e4
LT		 778asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
779{
780 int ret;
781 u32 a[6];
782 u32 a0, a1;
4768fbcb 783
a2e27255 784 if (call < SYS_SOCKET || call > SYS_RECVMMSG)
1da177e4
LT		 785 return -EINVAL;
786 if (copy_from_user(a, args, nas[call]))
787 return -EFAULT;
788 a0 = a[0];
789 a1 = a[1];
4768fbcb 790
e71a4783 791 switch (call) {
1da177e4
LT		 792 case SYS_SOCKET:
793 ret = sys_socket(a0, a1, a[2]);
794 break;
795 case SYS_BIND:
796 ret = sys_bind(a0, compat_ptr(a1), a[2]);
797 break;
798 case SYS_CONNECT:
799 ret = sys_connect(a0, compat_ptr(a1), a[2]);
800 break;
801 case SYS_LISTEN:
802 ret = sys_listen(a0, a1);
803 break;
804 case SYS_ACCEPT:
de11defe 805 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
1da177e4
LT		 806 break;
807 case SYS_GETSOCKNAME:
808 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
809 break;
810 case SYS_GETPEERNAME:
811 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
812 break;
813 case SYS_SOCKETPAIR:
814 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
815 break;
816 case SYS_SEND:
817 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
818 break;
819 case SYS_SENDTO:
820 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
821 break;
822 case SYS_RECV:
1dacc76d 823 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
1da177e4
LT		 824 break;
825 case SYS_RECVFROM:
1dacc76d
JB		 826 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
827 compat_ptr(a[4]), compat_ptr(a[5]));
1da177e4
LT		 828 break;
829 case SYS_SHUTDOWN:
830 ret = sys_shutdown(a0,a1);
831 break;
832 case SYS_SETSOCKOPT:
833 ret = compat_sys_setsockopt(a0, a1, a[2],
834 compat_ptr(a[3]), a[4]);
835 break;
836 case SYS_GETSOCKOPT:
837 ret = compat_sys_getsockopt(a0, a1, a[2],
838 compat_ptr(a[3]), compat_ptr(a[4]));
839 break;
840 case SYS_SENDMSG:
841 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
842 break;
843 case SYS_RECVMSG:
844 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
845 break;
a2e27255
ACM		 846 case SYS_RECVMMSG:
847 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
848 compat_ptr(a[4]));
849 break;
de11defe
UD		 850 case SYS_ACCEPT4:
851 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
aaca0bdc 852 break;
1da177e4
LT		 853 default:
854 ret = -EINVAL;
855 break;
856 }
857 return ret;
858}
Linux 6.x block layer and io_uring tree(s)