~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/compat.c

Version: ~ [ linux-6.1-rc7 ] ~ [ linux-6.0.10 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.80 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.156 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.225 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.267 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.300 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.334 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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/audit.h>
 26 #include <linux/export.h>
 27 
 28 #include <net/scm.h>
 29 #include <net/sock.h>
 30 #include <net/ip.h>
 31 #include <net/ipv6.h>
 32 #include <linux/uaccess.h>
 33 #include <net/compat.h>
 34 
 35 int get_compat_msghdr(struct msghdr *kmsg,
 36                       struct compat_msghdr __user *umsg,
 37                       struct sockaddr __user **save_addr,
 38                       struct iovec **iov)
 39 {
 40         compat_uptr_t uaddr, uiov, tmp3;
 41         compat_size_t nr_segs;
 42         ssize_t err;
 43 
 44         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
 45             __get_user(uaddr, &umsg->msg_name) ||
 46             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
 47             __get_user(uiov, &umsg->msg_iov) ||
 48             __get_user(nr_segs, &umsg->msg_iovlen) ||
 49             __get_user(tmp3, &umsg->msg_control) ||
 50             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
 51             __get_user(kmsg->msg_flags, &umsg->msg_flags))
 52                 return -EFAULT;
 53 
 54         if (!uaddr)
 55                 kmsg->msg_namelen = 0;
 56 
 57         if (kmsg->msg_namelen < 0)
 58                 return -EINVAL;
 59 
 60         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
 61                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
 62         kmsg->msg_control = compat_ptr(tmp3);
 63 
 64         if (save_addr)
 65                 *save_addr = compat_ptr(uaddr);
 66 
 67         if (uaddr && kmsg->msg_namelen) {
 68                 if (!save_addr) {
 69                         err = move_addr_to_kernel(compat_ptr(uaddr),
 70                                                   kmsg->msg_namelen,
 71                                                   kmsg->msg_name);
 72                         if (err < 0)
 73                                 return err;
 74                 }
 75         } else {
 76                 kmsg->msg_name = NULL;
 77                 kmsg->msg_namelen = 0;
 78         }
 79 
 80         if (nr_segs > UIO_MAXIOV)
 81                 return -EMSGSIZE;
 82 
 83         kmsg->msg_iocb = NULL;
 84 
 85         return compat_import_iovec(save_addr ? READ : WRITE,
 86                                    compat_ptr(uiov), nr_segs,
 87                                    UIO_FASTIOV, iov, &kmsg->msg_iter);
 88 }
 89 
 90 /* Bleech... */
 91 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 92 
 93 #define CMSG_COMPAT_DATA(cmsg)                          \
 94         ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
 95 #define CMSG_COMPAT_SPACE(len)                          \
 96         (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
 97 #define CMSG_COMPAT_LEN(len)                            \
 98         (sizeof(struct compat_cmsghdr) + (len))
 99 
100 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
101         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
102          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
103          (struct compat_cmsghdr __user *)NULL)
104 
105 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
106         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
107          (ucmlen) <= (unsigned long) \
108          ((mhdr)->msg_controllen - \
109           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
110 
111 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
112                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
113 {
114         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
115         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
116                         msg->msg_controllen)
117                 return NULL;
118         return (struct compat_cmsghdr __user *)ptr;
119 }
120 
121 /* There is a lot of hair here because the alignment rules (and
122  * thus placement) of cmsg headers and length are different for
123  * 32-bit apps.  -DaveM
124  */
125 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
126                                unsigned char *stackbuf, int stackbuf_size)
127 {
128         struct compat_cmsghdr __user *ucmsg;
129         struct cmsghdr *kcmsg, *kcmsg_base;
130         compat_size_t ucmlen;
131         __kernel_size_t kcmlen, tmp;
132         int err = -EFAULT;
133 
134         BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
135                      CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
136 
137         kcmlen = 0;
138         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
139         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
140         while (ucmsg != NULL) {
141                 if (get_user(ucmlen, &ucmsg->cmsg_len))
142                         return -EFAULT;
143 
144                 /* Catch bogons. */
145                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
146                         return -EINVAL;
147 
148                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
149                 tmp = CMSG_ALIGN(tmp);
150                 kcmlen += tmp;
151                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
152         }
153         if (kcmlen == 0)
154                 return -EINVAL;
155 
156         /* The kcmlen holds the 64-bit version of the control length.
157          * It may not be modified as we do not stick it into the kmsg
158          * until we have successfully copied over all of the data
159          * from the user.
160          */
161         if (kcmlen > stackbuf_size)
162                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
163         if (kcmsg == NULL)
164                 return -ENOBUFS;
165 
166         /* Now copy them over neatly. */
167         memset(kcmsg, 0, kcmlen);
168         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
169         while (ucmsg != NULL) {
170                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
171                         goto Efault;
172                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
173                         goto Einval;
174                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
175                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
176                         goto Einval;
177                 kcmsg->cmsg_len = tmp;
178                 tmp = CMSG_ALIGN(tmp);
179                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
180                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
181                     copy_from_user(CMSG_DATA(kcmsg),
182                                    CMSG_COMPAT_DATA(ucmsg),
183                                    (ucmlen - sizeof(*ucmsg))))
184                         goto Efault;
185 
186                 /* Advance. */
187                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
188                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
189         }
190 
191         /* Ok, looks like we made it.  Hook it up and return success. */
192         kmsg->msg_control = kcmsg_base;
193         kmsg->msg_controllen = kcmlen;
194         return 0;
195 
196 Einval:
197         err = -EINVAL;
198 Efault:
199         if (kcmsg_base != (struct cmsghdr *)stackbuf)
200                 sock_kfree_s(sk, kcmsg_base, kcmlen);
201         return err;
202 }
203 
204 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
205 {
206         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
207         struct compat_cmsghdr cmhdr;
208         struct compat_timeval ctv;
209         struct compat_timespec cts[3];
210         int cmlen;
211 
212         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
213                 kmsg->msg_flags |= MSG_CTRUNC;
214                 return 0; /* XXX: return error? check spec. */
215         }
216 
217         if (!COMPAT_USE_64BIT_TIME) {
218                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
219                         struct timeval *tv = (struct timeval *)data;
220                         ctv.tv_sec = tv->tv_sec;
221                         ctv.tv_usec = tv->tv_usec;
222                         data = &ctv;
223                         len = sizeof(ctv);
224                 }
225                 if (level == SOL_SOCKET &&
226                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
227                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
228                         int i;
229                         struct timespec *ts = (struct timespec *)data;
230                         for (i = 0; i < count; i++) {
231                                 cts[i].tv_sec = ts[i].tv_sec;
232                                 cts[i].tv_nsec = ts[i].tv_nsec;
233                         }
234                         data = &cts;
235                         len = sizeof(cts[0]) * count;
236                 }
237         }
238 
239         cmlen = CMSG_COMPAT_LEN(len);
240         if (kmsg->msg_controllen < cmlen) {
241                 kmsg->msg_flags |= MSG_CTRUNC;
242                 cmlen = kmsg->msg_controllen;
243         }
244         cmhdr.cmsg_level = level;
245         cmhdr.cmsg_type = type;
246         cmhdr.cmsg_len = cmlen;
247 
248         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
249                 return -EFAULT;
250         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
251                 return -EFAULT;
252         cmlen = CMSG_COMPAT_SPACE(len);
253         if (kmsg->msg_controllen < cmlen)
254                 cmlen = kmsg->msg_controllen;
255         kmsg->msg_control += cmlen;
256         kmsg->msg_controllen -= cmlen;
257         return 0;
258 }
259 
260 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
261 {
262         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
263         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
264         int fdnum = scm->fp->count;
265         struct file **fp = scm->fp->fp;
266         int __user *cmfptr;
267         int err = 0, i;
268 
269         if (fdnum < fdmax)
270                 fdmax = fdnum;
271 
272         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
273                 int new_fd;
274                 err = security_file_receive(fp[i]);
275                 if (err)
276                         break;
277                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
278                                           ? O_CLOEXEC : 0);
279                 if (err < 0)
280                         break;
281                 new_fd = err;
282                 err = put_user(new_fd, cmfptr);
283                 if (err) {
284                         put_unused_fd(new_fd);
285                         break;
286                 }
287                 /* Bump the usage count and install the file. */
288                 fd_install(new_fd, get_file(fp[i]));
289         }
290 
291         if (i > 0) {
292                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
293                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
294                 if (!err)
295                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
296                 if (!err)
297                         err = put_user(cmlen, &cm->cmsg_len);
298                 if (!err) {
299                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
300                         kmsg->msg_control += cmlen;
301                         kmsg->msg_controllen -= cmlen;
302                 }
303         }
304         if (i < fdnum)
305                 kmsg->msg_flags |= MSG_CTRUNC;
306 
307         /*
308          * All of the files that fit in the message have had their
309          * usage counts incremented, so we just free the list.
310          */
311         __scm_destroy(scm);
312 }
313 
314 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
315 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
316 {
317         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
318         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
319         compat_uptr_t ptr;
320         u16 len;
321 
322         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
323             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
324             __get_user(len, &fprog32->len) ||
325             __get_user(ptr, &fprog32->filter) ||
326             __put_user(len, &kfprog->len) ||
327             __put_user(compat_ptr(ptr), &kfprog->filter))
328                 return NULL;
329 
330         return kfprog;
331 }
332 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
333 
334 static int do_set_attach_filter(struct socket *sock, int level, int optname,
335                                 char __user *optval, unsigned int optlen)
336 {
337         struct sock_fprog __user *kfprog;
338 
339         kfprog = get_compat_bpf_fprog(optval);
340         if (!kfprog)
341                 return -EFAULT;
342 
343         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
344                               sizeof(struct sock_fprog));
345 }
346 
347 static int do_set_sock_timeout(struct socket *sock, int level,
348                 int optname, char __user *optval, unsigned int optlen)
349 {
350         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
351         struct timeval ktime;
352         mm_segment_t old_fs;
353         int err;
354 
355         if (optlen < sizeof(*up))
356                 return -EINVAL;
357         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
358             __get_user(ktime.tv_sec, &up->tv_sec) ||
359             __get_user(ktime.tv_usec, &up->tv_usec))
360                 return -EFAULT;
361         old_fs = get_fs();
362         set_fs(KERNEL_DS);
363         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
364         set_fs(old_fs);
365 
366         return err;
367 }
368 
369 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
370                                 char __user *optval, unsigned int optlen)
371 {
372         if (optname == SO_ATTACH_FILTER ||
373             optname == SO_ATTACH_REUSEPORT_CBPF)
374                 return do_set_attach_filter(sock, level, optname,
375                                             optval, optlen);
376         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
377                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
378 
379         return sock_setsockopt(sock, level, optname, optval, optlen);
380 }
381 
382 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
383                        char __user *, optval, unsigned int, optlen)
384 {
385         int err;
386         struct socket *sock = sockfd_lookup(fd, &err);
387 
388         if (sock) {
389                 err = security_socket_setsockopt(sock, level, optname);
390                 if (err) {
391                         sockfd_put(sock);
392                         return err;
393                 }
394 
395                 if (level == SOL_SOCKET)
396                         err = compat_sock_setsockopt(sock, level,
397                                         optname, optval, optlen);
398                 else if (sock->ops->compat_setsockopt)
399                         err = sock->ops->compat_setsockopt(sock, level,
400                                         optname, optval, optlen);
401                 else
402                         err = sock->ops->setsockopt(sock, level,
403                                         optname, optval, optlen);
404                 sockfd_put(sock);
405         }
406         return err;
407 }
408 
409 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
410                 char __user *optval, int __user *optlen)
411 {
412         struct compat_timeval __user *up;
413         struct timeval ktime;
414         mm_segment_t old_fs;
415         int len, err;
416 
417         up = (struct compat_timeval __user *) optval;
418         if (get_user(len, optlen))
419                 return -EFAULT;
420         if (len < sizeof(*up))
421                 return -EINVAL;
422         len = sizeof(ktime);
423         old_fs = get_fs();
424         set_fs(KERNEL_DS);
425         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
426         set_fs(old_fs);
427 
428         if (!err) {
429                 if (put_user(sizeof(*up), optlen) ||
430                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
431                     __put_user(ktime.tv_sec, &up->tv_sec) ||
432                     __put_user(ktime.tv_usec, &up->tv_usec))
433                         err = -EFAULT;
434         }
435         return err;
436 }
437 
438 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
439                                 char __user *optval, int __user *optlen)
440 {
441         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
442                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
443         return sock_getsockopt(sock, level, optname, optval, optlen);
444 }
445 
446 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
447 {
448         struct compat_timeval __user *ctv;
449         int err;
450         struct timeval tv;
451 
452         if (COMPAT_USE_64BIT_TIME)
453                 return sock_get_timestamp(sk, userstamp);
454 
455         ctv = (struct compat_timeval __user *) userstamp;
456         err = -ENOENT;
457         if (!sock_flag(sk, SOCK_TIMESTAMP))
458                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
459         tv = ktime_to_timeval(sk->sk_stamp);
460         if (tv.tv_sec == -1)
461                 return err;
462         if (tv.tv_sec == 0) {
463                 sk->sk_stamp = ktime_get_real();
464                 tv = ktime_to_timeval(sk->sk_stamp);
465         }
466         err = 0;
467         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
468                         put_user(tv.tv_usec, &ctv->tv_usec))
469                 err = -EFAULT;
470         return err;
471 }
472 EXPORT_SYMBOL(compat_sock_get_timestamp);
473 
474 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
475 {
476         struct compat_timespec __user *ctv;
477         int err;
478         struct timespec ts;
479 
480         if (COMPAT_USE_64BIT_TIME)
481                 return sock_get_timestampns (sk, userstamp);
482 
483         ctv = (struct compat_timespec __user *) userstamp;
484         err = -ENOENT;
485         if (!sock_flag(sk, SOCK_TIMESTAMP))
486                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
487         ts = ktime_to_timespec(sk->sk_stamp);
488         if (ts.tv_sec == -1)
489                 return err;
490         if (ts.tv_sec == 0) {
491                 sk->sk_stamp = ktime_get_real();
492                 ts = ktime_to_timespec(sk->sk_stamp);
493         }
494         err = 0;
495         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
496                         put_user(ts.tv_nsec, &ctv->tv_nsec))
497                 err = -EFAULT;
498         return err;
499 }
500 EXPORT_SYMBOL(compat_sock_get_timestampns);
501 
502 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
503                        char __user *, optval, int __user *, optlen)
504 {
505         int err;
506         struct socket *sock = sockfd_lookup(fd, &err);
507 
508         if (sock) {
509                 err = security_socket_getsockopt(sock, level, optname);
510                 if (err) {
511                         sockfd_put(sock);
512                         return err;
513                 }
514 
515                 if (level == SOL_SOCKET)
516                         err = compat_sock_getsockopt(sock, level,
517                                         optname, optval, optlen);
518                 else if (sock->ops->compat_getsockopt)
519                         err = sock->ops->compat_getsockopt(sock, level,
520                                         optname, optval, optlen);
521                 else
522                         err = sock->ops->getsockopt(sock, level,
523                                         optname, optval, optlen);
524                 sockfd_put(sock);
525         }
526         return err;
527 }
528 
529 struct compat_group_req {
530         __u32                            gr_interface;
531         struct __kernel_sockaddr_storage gr_group
532                 __aligned(4);
533 } __packed;
534 
535 struct compat_group_source_req {
536         __u32                            gsr_interface;
537         struct __kernel_sockaddr_storage gsr_group
538                 __aligned(4);
539         struct __kernel_sockaddr_storage gsr_source
540                 __aligned(4);
541 } __packed;
542 
543 struct compat_group_filter {
544         __u32                            gf_interface;
545         struct __kernel_sockaddr_storage gf_group
546                 __aligned(4);
547         __u32                            gf_fmode;
548         __u32                            gf_numsrc;
549         struct __kernel_sockaddr_storage gf_slist[1]
550                 __aligned(4);
551 } __packed;
552 
553 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
554                         sizeof(struct __kernel_sockaddr_storage))
555 
556 
557 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
558         char __user *optval, unsigned int optlen,
559         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
560 {
561         char __user     *koptval = optval;
562         int             koptlen = optlen;
563 
564         switch (optname) {
565         case MCAST_JOIN_GROUP:
566         case MCAST_LEAVE_GROUP:
567         {
568                 struct compat_group_req __user *gr32 = (void *)optval;
569                 struct group_req __user *kgr =
570                         compat_alloc_user_space(sizeof(struct group_req));
571                 u32 interface;
572 
573                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
574                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
575                     __get_user(interface, &gr32->gr_interface) ||
576                     __put_user(interface, &kgr->gr_interface) ||
577                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
578                                 sizeof(kgr->gr_group)))
579                         return -EFAULT;
580                 koptval = (char __user *)kgr;
581                 koptlen = sizeof(struct group_req);
582                 break;
583         }
584         case MCAST_JOIN_SOURCE_GROUP:
585         case MCAST_LEAVE_SOURCE_GROUP:
586         case MCAST_BLOCK_SOURCE:
587         case MCAST_UNBLOCK_SOURCE:
588         {
589                 struct compat_group_source_req __user *gsr32 = (void *)optval;
590                 struct group_source_req __user *kgsr = compat_alloc_user_space(
591                         sizeof(struct group_source_req));
592                 u32 interface;
593 
594                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
595                     !access_ok(VERIFY_WRITE, kgsr,
596                         sizeof(struct group_source_req)) ||
597                     __get_user(interface, &gsr32->gsr_interface) ||
598                     __put_user(interface, &kgsr->gsr_interface) ||
599                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
600                                 sizeof(kgsr->gsr_group)) ||
601                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
602                                 sizeof(kgsr->gsr_source)))
603                         return -EFAULT;
604                 koptval = (char __user *)kgsr;
605                 koptlen = sizeof(struct group_source_req);
606                 break;
607         }
608         case MCAST_MSFILTER:
609         {
610                 struct compat_group_filter __user *gf32 = (void *)optval;
611                 struct group_filter __user *kgf;
612                 u32 interface, fmode, numsrc;
613 
614                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
615                     __get_user(interface, &gf32->gf_interface) ||
616                     __get_user(fmode, &gf32->gf_fmode) ||
617                     __get_user(numsrc, &gf32->gf_numsrc))
618                         return -EFAULT;
619                 koptlen = optlen + sizeof(struct group_filter) -
620                                 sizeof(struct compat_group_filter);
621                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
622                         return -EINVAL;
623                 kgf = compat_alloc_user_space(koptlen);
624                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
625                     __put_user(interface, &kgf->gf_interface) ||
626                     __put_user(fmode, &kgf->gf_fmode) ||
627                     __put_user(numsrc, &kgf->gf_numsrc) ||
628                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
629                                 sizeof(kgf->gf_group)) ||
630                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
631                                 numsrc * sizeof(kgf->gf_slist[0]))))
632                         return -EFAULT;
633                 koptval = (char __user *)kgf;
634                 break;
635         }
636 
637         default:
638                 break;
639         }
640         return setsockopt(sock, level, optname, koptval, koptlen);
641 }
642 EXPORT_SYMBOL(compat_mc_setsockopt);
643 
644 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
645         char __user *optval, int __user *optlen,
646         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
647 {
648         struct compat_group_filter __user *gf32 = (void *)optval;
649         struct group_filter __user *kgf;
650         int __user      *koptlen;
651         u32 interface, fmode, numsrc;
652         int klen, ulen, err;
653 
654         if (optname != MCAST_MSFILTER)
655                 return getsockopt(sock, level, optname, optval, optlen);
656 
657         koptlen = compat_alloc_user_space(sizeof(*koptlen));
658         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
659             __get_user(ulen, optlen))
660                 return -EFAULT;
661 
662         /* adjust len for pad */
663         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
664 
665         if (klen < GROUP_FILTER_SIZE(0))
666                 return -EINVAL;
667 
668         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
669             __put_user(klen, koptlen))
670                 return -EFAULT;
671 
672         /* have to allow space for previous compat_alloc_user_space, too */
673         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
674 
675         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
676             __get_user(interface, &gf32->gf_interface) ||
677             __get_user(fmode, &gf32->gf_fmode) ||
678             __get_user(numsrc, &gf32->gf_numsrc) ||
679             __put_user(interface, &kgf->gf_interface) ||
680             __put_user(fmode, &kgf->gf_fmode) ||
681             __put_user(numsrc, &kgf->gf_numsrc) ||
682             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
683                 return -EFAULT;
684 
685         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
686         if (err)
687                 return err;
688 
689         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
690             __get_user(klen, koptlen))
691                 return -EFAULT;
692 
693         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
694 
695         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
696             __put_user(ulen, optlen))
697                 return -EFAULT;
698 
699         if (!access_ok(VERIFY_READ, kgf, klen) ||
700             !access_ok(VERIFY_WRITE, gf32, ulen) ||
701             __get_user(interface, &kgf->gf_interface) ||
702             __get_user(fmode, &kgf->gf_fmode) ||
703             __get_user(numsrc, &kgf->gf_numsrc) ||
704             __put_user(interface, &gf32->gf_interface) ||
705             __put_user(fmode, &gf32->gf_fmode) ||
706             __put_user(numsrc, &gf32->gf_numsrc))
707                 return -EFAULT;
708         if (numsrc) {
709                 int copylen;
710 
711                 klen -= GROUP_FILTER_SIZE(0);
712                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
713                 if (copylen > klen)
714                         copylen = klen;
715                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
716                         return -EFAULT;
717         }
718         return err;
719 }
720 EXPORT_SYMBOL(compat_mc_getsockopt);
721 
722 
723 /* Argument list sizes for compat_sys_socketcall */
724 #define AL(x) ((x) * sizeof(u32))
725 static unsigned char nas[21] = {
726         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
727         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
728         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
729         AL(4), AL(5), AL(4)
730 };
731 #undef AL
732 
733 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
734 {
735         return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
736 }
737 
738 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
739                        unsigned int, vlen, unsigned int, flags)
740 {
741         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
742                               flags | MSG_CMSG_COMPAT);
743 }
744 
745 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
746 {
747         return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
748 }
749 
750 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
751 {
752         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
753 }
754 
755 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
756                        unsigned int, flags, struct sockaddr __user *, addr,
757                        int __user *, addrlen)
758 {
759         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
760 }
761 
762 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
763                        unsigned int, vlen, unsigned int, flags,
764                        struct compat_timespec __user *, timeout)
765 {
766         int datagrams;
767         struct timespec ktspec;
768 
769         if (timeout == NULL)
770                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
771                                       flags | MSG_CMSG_COMPAT, NULL);
772 
773         if (compat_get_timespec(&ktspec, timeout))
774                 return -EFAULT;
775 
776         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
777                                    flags | MSG_CMSG_COMPAT, &ktspec);
778         if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
779                 datagrams = -EFAULT;
780 
781         return datagrams;
782 }
783 
784 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
785 {
786         u32 a[AUDITSC_ARGS];
787         unsigned int len;
788         u32 a0, a1;
789         int ret;
790 
791         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
792                 return -EINVAL;
793         len = nas[call];
794         if (len > sizeof(a))
795                 return -EINVAL;
796 
797         if (copy_from_user(a, args, len))
798                 return -EFAULT;
799 
800         ret = audit_socketcall_compat(len / sizeof(a[0]), a);
801         if (ret)
802                 return ret;
803 
804         a0 = a[0];
805         a1 = a[1];
806 
807         switch (call) {
808         case SYS_SOCKET:
809                 ret = sys_socket(a0, a1, a[2]);
810                 break;
811         case SYS_BIND:
812                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
813                 break;
814         case SYS_CONNECT:
815                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
816                 break;
817         case SYS_LISTEN:
818                 ret = sys_listen(a0, a1);
819                 break;
820         case SYS_ACCEPT:
821                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
822                 break;
823         case SYS_GETSOCKNAME:
824                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
825                 break;
826         case SYS_GETPEERNAME:
827                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
828                 break;
829         case SYS_SOCKETPAIR:
830                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
831                 break;
832         case SYS_SEND:
833                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
834                 break;
835         case SYS_SENDTO:
836                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
837                 break;
838         case SYS_RECV:
839                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
840                 break;
841         case SYS_RECVFROM:
842                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
843                                           compat_ptr(a[4]), compat_ptr(a[5]));
844                 break;
845         case SYS_SHUTDOWN:
846                 ret = sys_shutdown(a0, a1);
847                 break;
848         case SYS_SETSOCKOPT:
849                 ret = compat_sys_setsockopt(a0, a1, a[2],
850                                 compat_ptr(a[3]), a[4]);
851                 break;
852         case SYS_GETSOCKOPT:
853                 ret = compat_sys_getsockopt(a0, a1, a[2],
854                                 compat_ptr(a[3]), compat_ptr(a[4]));
855                 break;
856         case SYS_SENDMSG:
857                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
858                 break;
859         case SYS_SENDMMSG:
860                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
861                 break;
862         case SYS_RECVMSG:
863                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
864                 break;
865         case SYS_RECVMMSG:
866                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
867                                           compat_ptr(a[4]));
868                 break;
869         case SYS_ACCEPT4:
870                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
871                 break;
872         default:
873                 ret = -EINVAL;
874                 break;
875         }
876         return ret;
877 }
878 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp