Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/net/compat.c

  1 /*
  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>
 11  * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
 12  */
 13 
 14 #include <linux/kernel.h>
 15 #include <linux/gfp.h>
 16 #include <linux/fs.h>
 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>
 24 #include <linux/security.h>
 25 #include <linux/export.h>
 26 
 27 #include <net/scm.h>
 28 #include <net/sock.h>
 29 #include <net/ip.h>
 30 #include <net/ipv6.h>
 31 #include <linux/uaccess.h>
 32 #include <net/compat.h>
 33 
 34 int get_compat_msghdr(struct msghdr *kmsg,
 35                       struct compat_msghdr __user *umsg,
 36                       struct sockaddr __user **save_addr,
 37                       struct iovec **iov)
 38 {
 39         compat_uptr_t uaddr, uiov, tmp3;
 40         compat_size_t nr_segs;
 41         ssize_t err;
 42 
 43         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
 44             __get_user(uaddr, &umsg->msg_name) ||
 45             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
 46             __get_user(uiov, &umsg->msg_iov) ||
 47             __get_user(nr_segs, &umsg->msg_iovlen) ||
 48             __get_user(tmp3, &umsg->msg_control) ||
 49             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
 50             __get_user(kmsg->msg_flags, &umsg->msg_flags))
 51                 return -EFAULT;
 52 
 53         if (!uaddr)
 54                 kmsg->msg_namelen = 0;
 55 
 56         if (kmsg->msg_namelen < 0)
 57                 return -EINVAL;
 58 
 59         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
 60                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
 61         kmsg->msg_control = compat_ptr(tmp3);
 62 
 63         if (save_addr)
 64                 *save_addr = compat_ptr(uaddr);
 65 
 66         if (uaddr && kmsg->msg_namelen) {
 67                 if (!save_addr) {
 68                         err = move_addr_to_kernel(compat_ptr(uaddr),
 69                                                   kmsg->msg_namelen,
 70                                                   kmsg->msg_name);
 71                         if (err < 0)
 72                                 return err;
 73                 }
 74         } else {
 75                 kmsg->msg_name = NULL;
 76                 kmsg->msg_namelen = 0;
 77         }
 78 
 79         if (nr_segs > UIO_MAXIOV)
 80                 return -EMSGSIZE;
 81 
 82         kmsg->msg_iocb = NULL;
 83 
 84         return compat_import_iovec(save_addr ? READ : WRITE,
 85                                    compat_ptr(uiov), nr_segs,
 86                                    UIO_FASTIOV, iov, &kmsg->msg_iter);
 87 }
 88 
 89 /* Bleech... */
 90 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 91 
 92 #define CMSG_COMPAT_DATA(cmsg)                          \
 93         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 94 #define CMSG_COMPAT_SPACE(len)                          \
 95         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 96 #define CMSG_COMPAT_LEN(len)                            \
 97         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 98 
 99 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
100         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
101          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
102          (struct compat_cmsghdr __user *)NULL)
103 
104 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
105         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
106          (ucmlen) <= (unsigned long) \
107          ((mhdr)->msg_controllen - \
108           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
109 
110 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
111                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
112 {
113         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
114         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
115                         msg->msg_controllen)
116                 return NULL;
117         return (struct compat_cmsghdr __user *)ptr;
118 }
119 
120 /* There is a lot of hair here because the alignment rules (and
121  * thus placement) of cmsg headers and length are different for
122  * 32-bit apps.  -DaveM
123  */
124 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
125                                unsigned char *stackbuf, int stackbuf_size)
126 {
127         struct compat_cmsghdr __user *ucmsg;
128         struct cmsghdr *kcmsg, *kcmsg_base;
129         compat_size_t ucmlen;
130         __kernel_size_t kcmlen, tmp;
131         int err = -EFAULT;
132 
133         kcmlen = 0;
134         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
135         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
136         while (ucmsg != NULL) {
137                 if (get_user(ucmlen, &ucmsg->cmsg_len))
138                         return -EFAULT;
139 
140                 /* Catch bogons. */
141                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
142                         return -EINVAL;
143 
144                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
145                        CMSG_ALIGN(sizeof(struct cmsghdr)));
146                 tmp = CMSG_ALIGN(tmp);
147                 kcmlen += tmp;
148                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
149         }
150         if (kcmlen == 0)
151                 return -EINVAL;
152 
153         /* The kcmlen holds the 64-bit version of the control length.
154          * It may not be modified as we do not stick it into the kmsg
155          * until we have successfully copied over all of the data
156          * from the user.
157          */
158         if (kcmlen > stackbuf_size)
159                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
160         if (kcmsg == NULL)
161                 return -ENOBUFS;
162 
163         /* Now copy them over neatly. */
164         memset(kcmsg, 0, kcmlen);
165         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
166         while (ucmsg != NULL) {
167                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
168                         goto Efault;
169                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
170                         goto Einval;
171                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
172                        CMSG_ALIGN(sizeof(struct cmsghdr)));
173                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
174                         goto Einval;
175                 kcmsg->cmsg_len = tmp;
176                 tmp = CMSG_ALIGN(tmp);
177                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
178                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
179                     copy_from_user(CMSG_DATA(kcmsg),
180                                    CMSG_COMPAT_DATA(ucmsg),
181                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
182                         goto Efault;
183 
184                 /* Advance. */
185                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
186                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
187         }
188 
189         /* Ok, looks like we made it.  Hook it up and return success. */
190         kmsg->msg_control = kcmsg_base;
191         kmsg->msg_controllen = kcmlen;
192         return 0;
193 
194 Einval:
195         err = -EINVAL;
196 Efault:
197         if (kcmsg_base != (struct cmsghdr *)stackbuf)
198                 sock_kfree_s(sk, kcmsg_base, kcmlen);
199         return err;
200 }
201 
202 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
203 {
204         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
205         struct compat_cmsghdr cmhdr;
206         struct compat_timeval ctv;
207         struct compat_timespec cts[3];
208         int cmlen;
209 
210         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
211                 kmsg->msg_flags |= MSG_CTRUNC;
212                 return 0; /* XXX: return error? check spec. */
213         }
214 
215         if (!COMPAT_USE_64BIT_TIME) {
216                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
217                         struct timeval *tv = (struct timeval *)data;
218                         ctv.tv_sec = tv->tv_sec;
219                         ctv.tv_usec = tv->tv_usec;
220                         data = &ctv;
221                         len = sizeof(ctv);
222                 }
223                 if (level == SOL_SOCKET &&
224                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
225                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
226                         int i;
227                         struct timespec *ts = (struct timespec *)data;
228                         for (i = 0; i < count; i++) {
229                                 cts[i].tv_sec = ts[i].tv_sec;
230                                 cts[i].tv_nsec = ts[i].tv_nsec;
231                         }
232                         data = &cts;
233                         len = sizeof(cts[0]) * count;
234                 }
235         }
236 
237         cmlen = CMSG_COMPAT_LEN(len);
238         if (kmsg->msg_controllen < cmlen) {
239                 kmsg->msg_flags |= MSG_CTRUNC;
240                 cmlen = kmsg->msg_controllen;
241         }
242         cmhdr.cmsg_level = level;
243         cmhdr.cmsg_type = type;
244         cmhdr.cmsg_len = cmlen;
245 
246         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
247                 return -EFAULT;
248         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
249                 return -EFAULT;
250         cmlen = CMSG_COMPAT_SPACE(len);
251         if (kmsg->msg_controllen < cmlen)
252                 cmlen = kmsg->msg_controllen;
253         kmsg->msg_control += cmlen;
254         kmsg->msg_controllen -= cmlen;
255         return 0;
256 }
257 
258 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
259 {
260         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
261         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
262         int fdnum = scm->fp->count;
263         struct file **fp = scm->fp->fp;
264         int __user *cmfptr;
265         int err = 0, i;
266 
267         if (fdnum < fdmax)
268                 fdmax = fdnum;
269 
270         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
271                 int new_fd;
272                 err = security_file_receive(fp[i]);
273                 if (err)
274                         break;
275                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
276                                           ? O_CLOEXEC : 0);
277                 if (err < 0)
278                         break;
279                 new_fd = err;
280                 err = put_user(new_fd, cmfptr);
281                 if (err) {
282                         put_unused_fd(new_fd);
283                         break;
284                 }
285                 /* Bump the usage count and install the file. */
286                 fd_install(new_fd, get_file(fp[i]));
287         }
288 
289         if (i > 0) {
290                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
291                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
292                 if (!err)
293                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
294                 if (!err)
295                         err = put_user(cmlen, &cm->cmsg_len);
296                 if (!err) {
297                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
298                         kmsg->msg_control += cmlen;
299                         kmsg->msg_controllen -= cmlen;
300                 }
301         }
302         if (i < fdnum)
303                 kmsg->msg_flags |= MSG_CTRUNC;
304 
305         /*
306          * All of the files that fit in the message have had their
307          * usage counts incremented, so we just free the list.
308          */
309         __scm_destroy(scm);
310 }
311 
312 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
313 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
314 {
315         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
316         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
317         compat_uptr_t ptr;
318         u16 len;
319 
320         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
321             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
322             __get_user(len, &fprog32->len) ||
323             __get_user(ptr, &fprog32->filter) ||
324             __put_user(len, &kfprog->len) ||
325             __put_user(compat_ptr(ptr), &kfprog->filter))
326                 return NULL;
327 
328         return kfprog;
329 }
330 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
331 
332 static int do_set_attach_filter(struct socket *sock, int level, int optname,
333                                 char __user *optval, unsigned int optlen)
334 {
335         struct sock_fprog __user *kfprog;
336 
337         kfprog = get_compat_bpf_fprog(optval);
338         if (!kfprog)
339                 return -EFAULT;
340 
341         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
342                               sizeof(struct sock_fprog));
343 }
344 
345 static int do_set_sock_timeout(struct socket *sock, int level,
346                 int optname, char __user *optval, unsigned int optlen)
347 {
348         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
349         struct timeval ktime;
350         mm_segment_t old_fs;
351         int err;
352 
353         if (optlen < sizeof(*up))
354                 return -EINVAL;
355         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
356             __get_user(ktime.tv_sec, &up->tv_sec) ||
357             __get_user(ktime.tv_usec, &up->tv_usec))
358                 return -EFAULT;
359         old_fs = get_fs();
360         set_fs(KERNEL_DS);
361         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
362         set_fs(old_fs);
363 
364         return err;
365 }
366 
367 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
368                                 char __user *optval, unsigned int optlen)
369 {
370         if (optname == SO_ATTACH_FILTER ||
371             optname == SO_ATTACH_REUSEPORT_CBPF)
372                 return do_set_attach_filter(sock, level, optname,
373                                             optval, optlen);
374         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
375                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
376 
377         return sock_setsockopt(sock, level, optname, optval, optlen);
378 }
379 
380 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
381                        char __user *, optval, unsigned int, optlen)
382 {
383         int err;
384         struct socket *sock = sockfd_lookup(fd, &err);
385 
386         if (sock) {
387                 err = security_socket_setsockopt(sock, level, optname);
388                 if (err) {
389                         sockfd_put(sock);
390                         return err;
391                 }
392 
393                 if (level == SOL_SOCKET)
394                         err = compat_sock_setsockopt(sock, level,
395                                         optname, optval, optlen);
396                 else if (sock->ops->compat_setsockopt)
397                         err = sock->ops->compat_setsockopt(sock, level,
398                                         optname, optval, optlen);
399                 else
400                         err = sock->ops->setsockopt(sock, level,
401                                         optname, optval, optlen);
402                 sockfd_put(sock);
403         }
404         return err;
405 }
406 
407 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
408                 char __user *optval, int __user *optlen)
409 {
410         struct compat_timeval __user *up;
411         struct timeval ktime;
412         mm_segment_t old_fs;
413         int len, err;
414 
415         up = (struct compat_timeval __user *) optval;
416         if (get_user(len, optlen))
417                 return -EFAULT;
418         if (len < sizeof(*up))
419                 return -EINVAL;
420         len = sizeof(ktime);
421         old_fs = get_fs();
422         set_fs(KERNEL_DS);
423         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
424         set_fs(old_fs);
425 
426         if (!err) {
427                 if (put_user(sizeof(*up), optlen) ||
428                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
429                     __put_user(ktime.tv_sec, &up->tv_sec) ||
430                     __put_user(ktime.tv_usec, &up->tv_usec))
431                         err = -EFAULT;
432         }
433         return err;
434 }
435 
436 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
437                                 char __user *optval, int __user *optlen)
438 {
439         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
440                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
441         return sock_getsockopt(sock, level, optname, optval, optlen);
442 }
443 
444 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
445 {
446         struct compat_timeval __user *ctv;
447         int err;
448         struct timeval tv;
449 
450         if (COMPAT_USE_64BIT_TIME)
451                 return sock_get_timestamp(sk, userstamp);
452 
453         ctv = (struct compat_timeval __user *) userstamp;
454         err = -ENOENT;
455         if (!sock_flag(sk, SOCK_TIMESTAMP))
456                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
457         tv = ktime_to_timeval(sk->sk_stamp);
458         if (tv.tv_sec == -1)
459                 return err;
460         if (tv.tv_sec == 0) {
461                 sk->sk_stamp = ktime_get_real();
462                 tv = ktime_to_timeval(sk->sk_stamp);
463         }
464         err = 0;
465         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
466                         put_user(tv.tv_usec, &ctv->tv_usec))
467                 err = -EFAULT;
468         return err;
469 }
470 EXPORT_SYMBOL(compat_sock_get_timestamp);
471 
472 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
473 {
474         struct compat_timespec __user *ctv;
475         int err;
476         struct timespec ts;
477 
478         if (COMPAT_USE_64BIT_TIME)
479                 return sock_get_timestampns (sk, userstamp);
480 
481         ctv = (struct compat_timespec __user *) userstamp;
482         err = -ENOENT;
483         if (!sock_flag(sk, SOCK_TIMESTAMP))
484                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
485         ts = ktime_to_timespec(sk->sk_stamp);
486         if (ts.tv_sec == -1)
487                 return err;
488         if (ts.tv_sec == 0) {
489                 sk->sk_stamp = ktime_get_real();
490                 ts = ktime_to_timespec(sk->sk_stamp);
491         }
492         err = 0;
493         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
494                         put_user(ts.tv_nsec, &ctv->tv_nsec))
495                 err = -EFAULT;
496         return err;
497 }
498 EXPORT_SYMBOL(compat_sock_get_timestampns);
499 
500 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
501                        char __user *, optval, int __user *, optlen)
502 {
503         int err;
504         struct socket *sock = sockfd_lookup(fd, &err);
505 
506         if (sock) {
507                 err = security_socket_getsockopt(sock, level, optname);
508                 if (err) {
509                         sockfd_put(sock);
510                         return err;
511                 }
512 
513                 if (level == SOL_SOCKET)
514                         err = compat_sock_getsockopt(sock, level,
515                                         optname, optval, optlen);
516                 else if (sock->ops->compat_getsockopt)
517                         err = sock->ops->compat_getsockopt(sock, level,
518                                         optname, optval, optlen);
519                 else
520                         err = sock->ops->getsockopt(sock, level,
521                                         optname, optval, optlen);
522                 sockfd_put(sock);
523         }
524         return err;
525 }
526 
527 struct compat_group_req {
528         __u32                            gr_interface;
529         struct __kernel_sockaddr_storage gr_group
530                 __aligned(4);
531 } __packed;
532 
533 struct compat_group_source_req {
534         __u32                            gsr_interface;
535         struct __kernel_sockaddr_storage gsr_group
536                 __aligned(4);
537         struct __kernel_sockaddr_storage gsr_source
538                 __aligned(4);
539 } __packed;
540 
541 struct compat_group_filter {
542         __u32                            gf_interface;
543         struct __kernel_sockaddr_storage gf_group
544                 __aligned(4);
545         __u32                            gf_fmode;
546         __u32                            gf_numsrc;
547         struct __kernel_sockaddr_storage gf_slist[1]
548                 __aligned(4);
549 } __packed;
550 
551 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
552                         sizeof(struct __kernel_sockaddr_storage))
553 
554 
555 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
556         char __user *optval, unsigned int optlen,
557         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
558 {
559         char __user     *koptval = optval;
560         int             koptlen = optlen;
561 
562         switch (optname) {
563         case MCAST_JOIN_GROUP:
564         case MCAST_LEAVE_GROUP:
565         {
566                 struct compat_group_req __user *gr32 = (void *)optval;
567                 struct group_req __user *kgr =
568                         compat_alloc_user_space(sizeof(struct group_req));
569                 u32 interface;
570 
571                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
572                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
573                     __get_user(interface, &gr32->gr_interface) ||
574                     __put_user(interface, &kgr->gr_interface) ||
575                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
576                                 sizeof(kgr->gr_group)))
577                         return -EFAULT;
578                 koptval = (char __user *)kgr;
579                 koptlen = sizeof(struct group_req);
580                 break;
581         }
582         case MCAST_JOIN_SOURCE_GROUP:
583         case MCAST_LEAVE_SOURCE_GROUP:
584         case MCAST_BLOCK_SOURCE:
585         case MCAST_UNBLOCK_SOURCE:
586         {
587                 struct compat_group_source_req __user *gsr32 = (void *)optval;
588                 struct group_source_req __user *kgsr = compat_alloc_user_space(
589                         sizeof(struct group_source_req));
590                 u32 interface;
591 
592                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
593                     !access_ok(VERIFY_WRITE, kgsr,
594                         sizeof(struct group_source_req)) ||
595                     __get_user(interface, &gsr32->gsr_interface) ||
596                     __put_user(interface, &kgsr->gsr_interface) ||
597                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
598                                 sizeof(kgsr->gsr_group)) ||
599                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
600                                 sizeof(kgsr->gsr_source)))
601                         return -EFAULT;
602                 koptval = (char __user *)kgsr;
603                 koptlen = sizeof(struct group_source_req);
604                 break;
605         }
606         case MCAST_MSFILTER:
607         {
608                 struct compat_group_filter __user *gf32 = (void *)optval;
609                 struct group_filter __user *kgf;
610                 u32 interface, fmode, numsrc;
611 
612                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
613                     __get_user(interface, &gf32->gf_interface) ||
614                     __get_user(fmode, &gf32->gf_fmode) ||
615                     __get_user(numsrc, &gf32->gf_numsrc))
616                         return -EFAULT;
617                 koptlen = optlen + sizeof(struct group_filter) -
618                                 sizeof(struct compat_group_filter);
619                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
620                         return -EINVAL;
621                 kgf = compat_alloc_user_space(koptlen);
622                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
623                     __put_user(interface, &kgf->gf_interface) ||
624                     __put_user(fmode, &kgf->gf_fmode) ||
625                     __put_user(numsrc, &kgf->gf_numsrc) ||
626                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
627                                 sizeof(kgf->gf_group)) ||
628                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
629                                 numsrc * sizeof(kgf->gf_slist[0]))))
630                         return -EFAULT;
631                 koptval = (char __user *)kgf;
632                 break;
633         }
634 
635         default:
636                 break;
637         }
638         return setsockopt(sock, level, optname, koptval, koptlen);
639 }
640 EXPORT_SYMBOL(compat_mc_setsockopt);
641 
642 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
643         char __user *optval, int __user *optlen,
644         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
645 {
646         struct compat_group_filter __user *gf32 = (void *)optval;
647         struct group_filter __user *kgf;
648         int __user      *koptlen;
649         u32 interface, fmode, numsrc;
650         int klen, ulen, err;
651 
652         if (optname != MCAST_MSFILTER)
653                 return getsockopt(sock, level, optname, optval, optlen);
654 
655         koptlen = compat_alloc_user_space(sizeof(*koptlen));
656         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
657             __get_user(ulen, optlen))
658                 return -EFAULT;
659 
660         /* adjust len for pad */
661         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
662 
663         if (klen < GROUP_FILTER_SIZE(0))
664                 return -EINVAL;
665 
666         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
667             __put_user(klen, koptlen))
668                 return -EFAULT;
669 
670         /* have to allow space for previous compat_alloc_user_space, too */
671         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
672 
673         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
674             __get_user(interface, &gf32->gf_interface) ||
675             __get_user(fmode, &gf32->gf_fmode) ||
676             __get_user(numsrc, &gf32->gf_numsrc) ||
677             __put_user(interface, &kgf->gf_interface) ||
678             __put_user(fmode, &kgf->gf_fmode) ||
679             __put_user(numsrc, &kgf->gf_numsrc) ||
680             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
681                 return -EFAULT;
682 
683         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
684         if (err)
685                 return err;
686 
687         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
688             __get_user(klen, koptlen))
689                 return -EFAULT;
690 
691         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
692 
693         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
694             __put_user(ulen, optlen))
695                 return -EFAULT;
696 
697         if (!access_ok(VERIFY_READ, kgf, klen) ||
698             !access_ok(VERIFY_WRITE, gf32, ulen) ||
699             __get_user(interface, &kgf->gf_interface) ||
700             __get_user(fmode, &kgf->gf_fmode) ||
701             __get_user(numsrc, &kgf->gf_numsrc) ||
702             __put_user(interface, &gf32->gf_interface) ||
703             __put_user(fmode, &gf32->gf_fmode) ||
704             __put_user(numsrc, &gf32->gf_numsrc))
705                 return -EFAULT;
706         if (numsrc) {
707                 int copylen;
708 
709                 klen -= GROUP_FILTER_SIZE(0);
710                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
711                 if (copylen > klen)
712                         copylen = klen;
713                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
714                         return -EFAULT;
715         }
716         return err;
717 }
718 EXPORT_SYMBOL(compat_mc_getsockopt);
719 
720 
721 /* Argument list sizes for compat_sys_socketcall */
722 #define AL(x) ((x) * sizeof(u32))
723 static unsigned char nas[21] = {
724         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
725         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
726         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
727         AL(4), AL(5), AL(4)
728 };
729 #undef AL
730 
731 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
732 {
733         return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
734 }
735 
736 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
737                        unsigned int, vlen, unsigned int, flags)
738 {
739         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
740                               flags | MSG_CMSG_COMPAT);
741 }
742 
743 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
744 {
745         return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
746 }
747 
748 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
749 {
750         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
751 }
752 
753 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
754                        unsigned int, flags, struct sockaddr __user *, addr,
755                        int __user *, addrlen)
756 {
757         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
758 }
759 
760 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
761                        unsigned int, vlen, unsigned int, flags,
762                        struct compat_timespec __user *, timeout)
763 {
764         int datagrams;
765         struct timespec ktspec;
766 
767         if (timeout == NULL)
768                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
769                                       flags | MSG_CMSG_COMPAT, NULL);
770 
771         if (compat_get_timespec(&ktspec, timeout))
772                 return -EFAULT;
773 
774         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
775                                    flags | MSG_CMSG_COMPAT, &ktspec);
776         if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
777                 datagrams = -EFAULT;
778 
779         return datagrams;
780 }
781 
782 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
783 {
784         int ret;
785         u32 a[6];
786         u32 a0, a1;
787 
788         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
789                 return -EINVAL;
790         if (copy_from_user(a, args, nas[call]))
791                 return -EFAULT;
792         a0 = a[0];
793         a1 = a[1];
794 
795         switch (call) {
796         case SYS_SOCKET:
797                 ret = sys_socket(a0, a1, a[2]);
798                 break;
799         case SYS_BIND:
800                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
801                 break;
802         case SYS_CONNECT:
803                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
804                 break;
805         case SYS_LISTEN:
806                 ret = sys_listen(a0, a1);
807                 break;
808         case SYS_ACCEPT:
809                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
810                 break;
811         case SYS_GETSOCKNAME:
812                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
813                 break;
814         case SYS_GETPEERNAME:
815                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
816                 break;
817         case SYS_SOCKETPAIR:
818                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
819                 break;
820         case SYS_SEND:
821                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
822                 break;
823         case SYS_SENDTO:
824                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
825                 break;
826         case SYS_RECV:
827                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
828                 break;
829         case SYS_RECVFROM:
830                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
831                                           compat_ptr(a[4]), compat_ptr(a[5]));
832                 break;
833         case SYS_SHUTDOWN:
834                 ret = sys_shutdown(a0, a1);
835                 break;
836         case SYS_SETSOCKOPT:
837                 ret = compat_sys_setsockopt(a0, a1, a[2],
838                                 compat_ptr(a[3]), a[4]);
839                 break;
840         case SYS_GETSOCKOPT:
841                 ret = compat_sys_getsockopt(a0, a1, a[2],
842                                 compat_ptr(a[3]), compat_ptr(a[4]));
843                 break;
844         case SYS_SENDMSG:
845                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
846                 break;
847         case SYS_SENDMMSG:
848                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
849                 break;
850         case SYS_RECVMSG:
851                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
852                 break;
853         case SYS_RECVMMSG:
854                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
855                                           compat_ptr(a[4]));
856                 break;
857         case SYS_ACCEPT4:
858                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
859                 break;
860         default:
861                 ret = -EINVAL;
862                 break;
863         }
864         return ret;
865 }
866 

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