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