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 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  36                                           struct compat_iovec __user *uiov32,
  37                                           int niov)
  38 {
  39         int tot_len = 0;
  40
  41         while (niov > 0) {
  42                 compat_uptr_t buf;
  43                 compat_size_t len;
  44
  45                 if (get_user(len, &uiov32->iov_len) ||
  46                     get_user(buf, &uiov32->iov_base))
  47                         return -EFAULT;
  48
  49                 if (len > INT_MAX - tot_len)
  50                         len = INT_MAX - tot_len;
  51
  52                 tot_len += len;
  53                 kiov->iov_base = compat_ptr(buf);
  54                 kiov->iov_len = (__kernel_size_t) len;
  55                 uiov32++;
  56                 kiov++;
  57                 niov--;
  58         }
  59         return tot_len;
  60 }
  61
  62 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  63 {
  64         compat_uptr_t tmp1, tmp2, tmp3;
  65
  66         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  67             __get_user(tmp1, &umsg->msg_name) ||
  68             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  69             __get_user(tmp2, &umsg->msg_iov) ||
  70             __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  71             __get_user(tmp3, &umsg->msg_control) ||
  72             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  73             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  74                 return -EFAULT;
  75
  76         if (!tmp1)
  77                 kmsg->msg_namelen = 0;
  78
  79         if (kmsg->msg_namelen < 0)
  80                 return -EINVAL;
  81
  82         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  83                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  84         kmsg->msg_name = compat_ptr(tmp1);
  85         kmsg->msg_iov = compat_ptr(tmp2);
  86         kmsg->msg_control = compat_ptr(tmp3);
  87         return 0;
  88 }
  89
  90 /* I've named the args so it is easy to tell whose space the pointers are in. */
  91 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  92                    struct sockaddr_storage *kern_address, int mode)
  93 {
  94         int tot_len;
  95
  96         if (kern_msg->msg_name && kern_msg->msg_namelen) {
  97                 if (mode == VERIFY_READ) {
  98                         int err = move_addr_to_kernel(kern_msg->msg_name,
  99                                                       kern_msg->msg_namelen,
 100                                                       kern_address);
 101                         if (err < 0)
 102                                 return err;
 103                 }
 104                 kern_msg->msg_name = kern_address;
 105         } else {
 106                 kern_msg->msg_name = NULL;
 107                 kern_msg->msg_namelen = 0;
 108         }
 109
 110         tot_len = iov_from_user_compat_to_kern(kern_iov,
 111                                           (struct compat_iovec __user *)kern_msg->msg_iov,
 112                                           kern_msg->msg_iovlen);
 113         if (tot_len >= 0)
 114                 kern_msg->msg_iov = kern_iov;
 115
 116         return tot_len;
 117 }
 118
 119 /* Bleech... */
 120 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 121
 122 #define CMSG_COMPAT_DATA(cmsg)                          \
 123         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 124 #define CMSG_COMPAT_SPACE(len)                          \
 125         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 126 #define CMSG_COMPAT_LEN(len)                            \
 127         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 128
 129 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 130         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 131          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 132          (struct compat_cmsghdr __user *)NULL)
 133
 134 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 135         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 136          (ucmlen) <= (unsigned long) \
 137          ((mhdr)->msg_controllen - \
 138           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 139
 140 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 141                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 142 {
 143         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 144         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 145                         msg->msg_controllen)
 146                 return NULL;
 147         return (struct compat_cmsghdr __user *)ptr;
 148 }
 149
 150 /* There is a lot of hair here because the alignment rules (and
 151  * thus placement) of cmsg headers and length are different for
 152  * 32-bit apps.  -DaveM
 153  */
 154 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 155                                unsigned char *stackbuf, int stackbuf_size)
 156 {
 157         struct compat_cmsghdr __user *ucmsg;
 158         struct cmsghdr *kcmsg, *kcmsg_base;
 159         compat_size_t ucmlen;
 160         __kernel_size_t kcmlen, tmp;
 161         int err = -EFAULT;
 162
 163         kcmlen = 0;
 164         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 165         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 166         while (ucmsg != NULL) {
 167                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 168                         return -EFAULT;
 169
 170                 /* Catch bogons. */
 171                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 172                         return -EINVAL;
 173
 174                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 175                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 176                 tmp = CMSG_ALIGN(tmp);
 177                 kcmlen += tmp;
 178                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 179         }
 180         if (kcmlen == 0)
 181                 return -EINVAL;
 182
 183         /* The kcmlen holds the 64-bit version of the control length.
 184          * It may not be modified as we do not stick it into the kmsg
 185          * until we have successfully copied over all of the data
 186          * from the user.
 187          */
 188         if (kcmlen > stackbuf_size)
 189                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 190         if (kcmsg == NULL)
 191                 return -ENOBUFS;
 192
 193         /* Now copy them over neatly. */
 194         memset(kcmsg, 0, kcmlen);
 195         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 196         while (ucmsg != NULL) {
 197                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 198                         goto Efault;
 199                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 200                         goto Einval;
 201                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 202                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 203                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 204                         goto Einval;
 205                 kcmsg->cmsg_len = tmp;
 206                 tmp = CMSG_ALIGN(tmp);
 207                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 208                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 209                     copy_from_user(CMSG_DATA(kcmsg),
 210                                    CMSG_COMPAT_DATA(ucmsg),
 211                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 212                         goto Efault;
 213
 214                 /* Advance. */
 215                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 216                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 217         }
 218
 219         /* Ok, looks like we made it.  Hook it up and return success. */
 220         kmsg->msg_control = kcmsg_base;
 221         kmsg->msg_controllen = kcmlen;
 222         return 0;
 223
 224 Einval:
 225         err = -EINVAL;
 226 Efault:
 227         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 228                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 229         return err;
 230 }
 231
 232 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 233 {
 234         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 235         struct compat_cmsghdr cmhdr;
 236         struct compat_timeval ctv;
 237         struct compat_timespec cts[3];
 238         int cmlen;
 239
 240         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 241                 kmsg->msg_flags |= MSG_CTRUNC;
 242                 return 0; /* XXX: return error? check spec. */
 243         }
 244
 245         if (!COMPAT_USE_64BIT_TIME) {
 246                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 247                         struct timeval *tv = (struct timeval *)data;
 248                         ctv.tv_sec = tv->tv_sec;
 249                         ctv.tv_usec = tv->tv_usec;
 250                         data = &ctv;
 251                         len = sizeof(ctv);
 252                 }
 253                 if (level == SOL_SOCKET &&
 254                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 255                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 256                         int i;
 257                         struct timespec *ts = (struct timespec *)data;
 258                         for (i = 0; i < count; i++) {
 259                                 cts[i].tv_sec = ts[i].tv_sec;
 260                                 cts[i].tv_nsec = ts[i].tv_nsec;
 261                         }
 262                         data = &cts;
 263                         len = sizeof(cts[0]) * count;
 264                 }
 265         }
 266
 267         cmlen = CMSG_COMPAT_LEN(len);
 268         if (kmsg->msg_controllen < cmlen) {
 269                 kmsg->msg_flags |= MSG_CTRUNC;
 270                 cmlen = kmsg->msg_controllen;
 271         }
 272         cmhdr.cmsg_level = level;
 273         cmhdr.cmsg_type = type;
 274         cmhdr.cmsg_len = cmlen;
 275
 276         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 277                 return -EFAULT;
 278         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 279                 return -EFAULT;
 280         cmlen = CMSG_COMPAT_SPACE(len);
 281         if (kmsg->msg_controllen < cmlen)
 282                 cmlen = kmsg->msg_controllen;
 283         kmsg->msg_control += cmlen;
 284         kmsg->msg_controllen -= cmlen;
 285         return 0;
 286 }
 287
 288 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 289 {
 290         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 291         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 292         int fdnum = scm->fp->count;
 293         struct file **fp = scm->fp->fp;
 294         int __user *cmfptr;
 295         int err = 0, i;
 296
 297         if (fdnum < fdmax)
 298                 fdmax = fdnum;
 299
 300         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 301                 int new_fd;
 302                 err = security_file_receive(fp[i]);
 303                 if (err)
 304                         break;
 305                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 306                                           ? O_CLOEXEC : 0);
 307                 if (err < 0)
 308                         break;
 309                 new_fd = err;
 310                 err = put_user(new_fd, cmfptr);
 311                 if (err) {
 312                         put_unused_fd(new_fd);
 313                         break;
 314                 }
 315                 /* Bump the usage count and install the file. */
 316                 fd_install(new_fd, get_file(fp[i]));
 317         }
 318
 319         if (i > 0) {
 320                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 321                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 322                 if (!err)
 323                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 324                 if (!err)
 325                         err = put_user(cmlen, &cm->cmsg_len);
 326                 if (!err) {
 327                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 328                         kmsg->msg_control += cmlen;
 329                         kmsg->msg_controllen -= cmlen;
 330                 }
 331         }
 332         if (i < fdnum)
 333                 kmsg->msg_flags |= MSG_CTRUNC;
 334
 335         /*
 336          * All of the files that fit in the message have had their
 337          * usage counts incremented, so we just free the list.
 338          */
 339         __scm_destroy(scm);
 340 }
 341
 342 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 343                                 char __user *optval, unsigned int optlen)
 344 {
 345         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 346         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 347         compat_uptr_t ptr;
 348         u16 len;
 349
 350         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 351             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 352             __get_user(len, &fprog32->len) ||
 353             __get_user(ptr, &fprog32->filter) ||
 354             __put_user(len, &kfprog->len) ||
 355             __put_user(compat_ptr(ptr), &kfprog->filter))
 356                 return -EFAULT;
 357
 358         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 359                               sizeof(struct sock_fprog));
 360 }
 361
 362 static int do_set_sock_timeout(struct socket *sock, int level,
 363                 int optname, char __user *optval, unsigned int optlen)
 364 {
 365         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 366         struct timeval ktime;
 367         mm_segment_t old_fs;
 368         int err;
 369
 370         if (optlen < sizeof(*up))
 371                 return -EINVAL;
 372         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 373             __get_user(ktime.tv_sec, &up->tv_sec) ||
 374             __get_user(ktime.tv_usec, &up->tv_usec))
 375                 return -EFAULT;
 376         old_fs = get_fs();
 377         set_fs(KERNEL_DS);
 378         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 379         set_fs(old_fs);
 380
 381         return err;
 382 }
 383
 384 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 385                                 char __user *optval, unsigned int optlen)
 386 {
 387         if (optname == SO_ATTACH_FILTER)
 388                 return do_set_attach_filter(sock, level, optname,
 389                                             optval, optlen);
 390         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 391                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 392
 393         return sock_setsockopt(sock, level, optname, optval, optlen);
 394 }
 395
 396 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 397                        char __user *, optval, unsigned int, optlen)
 398 {
 399         int err;
 400         struct socket *sock = sockfd_lookup(fd, &err);
 401
 402         if (sock) {
 403                 err = security_socket_setsockopt(sock, level, optname);
 404                 if (err) {
 405                         sockfd_put(sock);
 406                         return err;
 407                 }
 408
 409                 if (level == SOL_SOCKET)
 410                         err = compat_sock_setsockopt(sock, level,
 411                                         optname, optval, optlen);
 412                 else if (sock->ops->compat_setsockopt)
 413                         err = sock->ops->compat_setsockopt(sock, level,
 414                                         optname, optval, optlen);
 415                 else
 416                         err = sock->ops->setsockopt(sock, level,
 417                                         optname, optval, optlen);
 418                 sockfd_put(sock);
 419         }
 420         return err;
 421 }
 422
 423 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 424                 char __user *optval, int __user *optlen)
 425 {
 426         struct compat_timeval __user *up;
 427         struct timeval ktime;
 428         mm_segment_t old_fs;
 429         int len, err;
 430
 431         up = (struct compat_timeval __user *) optval;
 432         if (get_user(len, optlen))
 433                 return -EFAULT;
 434         if (len < sizeof(*up))
 435                 return -EINVAL;
 436         len = sizeof(ktime);
 437         old_fs = get_fs();
 438         set_fs(KERNEL_DS);
 439         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 440         set_fs(old_fs);
 441
 442         if (!err) {
 443                 if (put_user(sizeof(*up), optlen) ||
 444                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 445                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 446                     __put_user(ktime.tv_usec, &up->tv_usec))
 447                         err = -EFAULT;
 448         }
 449         return err;
 450 }
 451
 452 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 453                                 char __user *optval, int __user *optlen)
 454 {
 455         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 456                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 457         return sock_getsockopt(sock, level, optname, optval, optlen);
 458 }
 459
 460 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 461 {
 462         struct compat_timeval __user *ctv;
 463         int err;
 464         struct timeval tv;
 465
 466         if (COMPAT_USE_64BIT_TIME)
 467                 return sock_get_timestamp(sk, userstamp);
 468
 469         ctv = (struct compat_timeval __user *) userstamp;
 470         err = -ENOENT;
 471         if (!sock_flag(sk, SOCK_TIMESTAMP))
 472                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 473         tv = ktime_to_timeval(sk->sk_stamp);
 474         if (tv.tv_sec == -1)
 475                 return err;
 476         if (tv.tv_sec == 0) {
 477                 sk->sk_stamp = ktime_get_real();
 478                 tv = ktime_to_timeval(sk->sk_stamp);
 479         }
 480         err = 0;
 481         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 482                         put_user(tv.tv_usec, &ctv->tv_usec))
 483                 err = -EFAULT;
 484         return err;
 485 }
 486 EXPORT_SYMBOL(compat_sock_get_timestamp);
 487
 488 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 489 {
 490         struct compat_timespec __user *ctv;
 491         int err;
 492         struct timespec ts;
 493
 494         if (COMPAT_USE_64BIT_TIME)
 495                 return sock_get_timestampns (sk, userstamp);
 496
 497         ctv = (struct compat_timespec __user *) userstamp;
 498         err = -ENOENT;
 499         if (!sock_flag(sk, SOCK_TIMESTAMP))
 500                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 501         ts = ktime_to_timespec(sk->sk_stamp);
 502         if (ts.tv_sec == -1)
 503                 return err;
 504         if (ts.tv_sec == 0) {
 505                 sk->sk_stamp = ktime_get_real();
 506                 ts = ktime_to_timespec(sk->sk_stamp);
 507         }
 508         err = 0;
 509         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 510                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 511                 err = -EFAULT;
 512         return err;
 513 }
 514 EXPORT_SYMBOL(compat_sock_get_timestampns);
 515
 516 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 517                        char __user *, optval, int __user *, optlen)
 518 {
 519         int err;
 520         struct socket *sock = sockfd_lookup(fd, &err);
 521
 522         if (sock) {
 523                 err = security_socket_getsockopt(sock, level, optname);
 524                 if (err) {
 525                         sockfd_put(sock);
 526                         return err;
 527                 }
 528
 529                 if (level == SOL_SOCKET)
 530                         err = compat_sock_getsockopt(sock, level,
 531                                         optname, optval, optlen);
 532                 else if (sock->ops->compat_getsockopt)
 533                         err = sock->ops->compat_getsockopt(sock, level,
 534                                         optname, optval, optlen);
 535                 else
 536                         err = sock->ops->getsockopt(sock, level,
 537                                         optname, optval, optlen);
 538                 sockfd_put(sock);
 539         }
 540         return err;
 541 }
 542
 543 struct compat_group_req {
 544         __u32                            gr_interface;
 545         struct __kernel_sockaddr_storage gr_group
 546                 __attribute__ ((aligned(4)));
 547 } __packed;
 548
 549 struct compat_group_source_req {
 550         __u32                            gsr_interface;
 551         struct __kernel_sockaddr_storage gsr_group
 552                 __attribute__ ((aligned(4)));
 553         struct __kernel_sockaddr_storage gsr_source
 554                 __attribute__ ((aligned(4)));
 555 } __packed;
 556
 557 struct compat_group_filter {
 558         __u32                            gf_interface;
 559         struct __kernel_sockaddr_storage gf_group
 560                 __attribute__ ((aligned(4)));
 561         __u32                            gf_fmode;
 562         __u32                            gf_numsrc;
 563         struct __kernel_sockaddr_storage gf_slist[1]
 564                 __attribute__ ((aligned(4)));
 565 } __packed;
 566
 567 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 568                         sizeof(struct __kernel_sockaddr_storage))
 569
 570
 571 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 572         char __user *optval, unsigned int optlen,
 573         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 574 {
 575         char __user     *koptval = optval;
 576         int             koptlen = optlen;
 577
 578         switch (optname) {
 579         case MCAST_JOIN_GROUP:
 580         case MCAST_LEAVE_GROUP:
 581         {
 582                 struct compat_group_req __user *gr32 = (void *)optval;
 583                 struct group_req __user *kgr =
 584                         compat_alloc_user_space(sizeof(struct group_req));
 585                 u32 interface;
 586
 587                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 588                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 589                     __get_user(interface, &gr32->gr_interface) ||
 590                     __put_user(interface, &kgr->gr_interface) ||
 591                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 592                                 sizeof(kgr->gr_group)))
 593                         return -EFAULT;
 594                 koptval = (char __user *)kgr;
 595                 koptlen = sizeof(struct group_req);
 596                 break;
 597         }
 598         case MCAST_JOIN_SOURCE_GROUP:
 599         case MCAST_LEAVE_SOURCE_GROUP:
 600         case MCAST_BLOCK_SOURCE:
 601         case MCAST_UNBLOCK_SOURCE:
 602         {
 603                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 604                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 605                         sizeof(struct group_source_req));
 606                 u32 interface;
 607
 608                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 609                     !access_ok(VERIFY_WRITE, kgsr,
 610                         sizeof(struct group_source_req)) ||
 611                     __get_user(interface, &gsr32->gsr_interface) ||
 612                     __put_user(interface, &kgsr->gsr_interface) ||
 613                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 614                                 sizeof(kgsr->gsr_group)) ||
 615                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 616                                 sizeof(kgsr->gsr_source)))
 617                         return -EFAULT;
 618                 koptval = (char __user *)kgsr;
 619                 koptlen = sizeof(struct group_source_req);
 620                 break;
 621         }
 622         case MCAST_MSFILTER:
 623         {
 624                 struct compat_group_filter __user *gf32 = (void *)optval;
 625                 struct group_filter __user *kgf;
 626                 u32 interface, fmode, numsrc;
 627
 628                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 629                     __get_user(interface, &gf32->gf_interface) ||
 630                     __get_user(fmode, &gf32->gf_fmode) ||
 631                     __get_user(numsrc, &gf32->gf_numsrc))
 632                         return -EFAULT;
 633                 koptlen = optlen + sizeof(struct group_filter) -
 634                                 sizeof(struct compat_group_filter);
 635                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 636                         return -EINVAL;
 637                 kgf = compat_alloc_user_space(koptlen);
 638                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 639                     __put_user(interface, &kgf->gf_interface) ||
 640                     __put_user(fmode, &kgf->gf_fmode) ||
 641                     __put_user(numsrc, &kgf->gf_numsrc) ||
 642                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 643                                 sizeof(kgf->gf_group)) ||
 644                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 645                                 numsrc * sizeof(kgf->gf_slist[0]))))
 646                         return -EFAULT;
 647                 koptval = (char __user *)kgf;
 648                 break;
 649         }
 650
 651         default:
 652                 break;
 653         }
 654         return setsockopt(sock, level, optname, koptval, koptlen);
 655 }
 656 EXPORT_SYMBOL(compat_mc_setsockopt);
 657
 658 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 659         char __user *optval, int __user *optlen,
 660         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 661 {
 662         struct compat_group_filter __user *gf32 = (void *)optval;
 663         struct group_filter __user *kgf;
 664         int __user      *koptlen;
 665         u32 interface, fmode, numsrc;
 666         int klen, ulen, err;
 667
 668         if (optname != MCAST_MSFILTER)
 669                 return getsockopt(sock, level, optname, optval, optlen);
 670
 671         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 672         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 673             __get_user(ulen, optlen))
 674                 return -EFAULT;
 675
 676         /* adjust len for pad */
 677         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 678
 679         if (klen < GROUP_FILTER_SIZE(0))
 680                 return -EINVAL;
 681
 682         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 683             __put_user(klen, koptlen))
 684                 return -EFAULT;
 685
 686         /* have to allow space for previous compat_alloc_user_space, too */
 687         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 688
 689         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 690             __get_user(interface, &gf32->gf_interface) ||
 691             __get_user(fmode, &gf32->gf_fmode) ||
 692             __get_user(numsrc, &gf32->gf_numsrc) ||
 693             __put_user(interface, &kgf->gf_interface) ||
 694             __put_user(fmode, &kgf->gf_fmode) ||
 695             __put_user(numsrc, &kgf->gf_numsrc) ||
 696             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 697                 return -EFAULT;
 698
 699         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 700         if (err)
 701                 return err;
 702
 703         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 704             __get_user(klen, koptlen))
 705                 return -EFAULT;
 706
 707         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 708
 709         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 710             __put_user(ulen, optlen))
 711                 return -EFAULT;
 712
 713         if (!access_ok(VERIFY_READ, kgf, klen) ||
 714             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 715             __get_user(interface, &kgf->gf_interface) ||
 716             __get_user(fmode, &kgf->gf_fmode) ||
 717             __get_user(numsrc, &kgf->gf_numsrc) ||
 718             __put_user(interface, &gf32->gf_interface) ||
 719             __put_user(fmode, &gf32->gf_fmode) ||
 720             __put_user(numsrc, &gf32->gf_numsrc))
 721                 return -EFAULT;
 722         if (numsrc) {
 723                 int copylen;
 724
 725                 klen -= GROUP_FILTER_SIZE(0);
 726                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 727                 if (copylen > klen)
 728                         copylen = klen;
 729                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 730                         return -EFAULT;
 731         }
 732         return err;
 733 }
 734 EXPORT_SYMBOL(compat_mc_getsockopt);
 735
 736
 737 /* Argument list sizes for compat_sys_socketcall */
 738 #define AL(x) ((x) * sizeof(u32))
 739 static unsigned char nas[21] = {
 740         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 741         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 742         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 743         AL(4), AL(5), AL(4)
 744 };
 745 #undef AL
 746
 747 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 748 {
 749         return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 750 }
 751
 752 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 753                        unsigned int, vlen, unsigned int, flags)
 754 {
 755         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 756                               flags | MSG_CMSG_COMPAT);
 757 }
 758
 759 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 760 {
 761         return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 762 }
 763
 764 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 765 {
 766         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 767 }
 768
 769 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 770                        unsigned int, flags, struct sockaddr __user *, addr,
 771                        int __user *, addrlen)
 772 {
 773         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 774 }
 775
 776 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 777                        unsigned int, vlen, unsigned int, flags,
 778                        struct compat_timespec __user *, timeout)
 779 {
 780         int datagrams;
 781         struct timespec ktspec;
 782
 783         if (timeout == NULL)
 784                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 785                                       flags | MSG_CMSG_COMPAT, NULL);
 786
 787         if (compat_get_timespec(&ktspec, timeout))
 788                 return -EFAULT;
 789
 790         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 791                                    flags | MSG_CMSG_COMPAT, &ktspec);
 792         if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 793                 datagrams = -EFAULT;
 794
 795         return datagrams;
 796 }
 797
 798 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 799 {
 800         u32 a[AUDITSC_ARGS];
 801         unsigned int len;
 802         u32 a0, a1;
 803         int ret;
 804
 805         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 806                 return -EINVAL;
 807         len = nas[call];
 808         if (len > sizeof(a))
 809                 return -EINVAL;
 810
 811         if (copy_from_user(a, args, len))
 812                 return -EFAULT;
 813
 814         ret = audit_socketcall_compat(len / sizeof(a[0]), a);
 815         if (ret)
 816                 return ret;
 817
 818         a0 = a[0];
 819         a1 = a[1];
 820
 821         switch (call) {
 822         case SYS_SOCKET:
 823                 ret = sys_socket(a0, a1, a[2]);
 824                 break;
 825         case SYS_BIND:
 826                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 827                 break;
 828         case SYS_CONNECT:
 829                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 830                 break;
 831         case SYS_LISTEN:
 832                 ret = sys_listen(a0, a1);
 833                 break;
 834         case SYS_ACCEPT:
 835                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 836                 break;
 837         case SYS_GETSOCKNAME:
 838                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 839                 break;
 840         case SYS_GETPEERNAME:
 841                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 842                 break;
 843         case SYS_SOCKETPAIR:
 844                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 845                 break;
 846         case SYS_SEND:
 847                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 848                 break;
 849         case SYS_SENDTO:
 850                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 851                 break;
 852         case SYS_RECV:
 853                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 854                 break;
 855         case SYS_RECVFROM:
 856                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 857                                           compat_ptr(a[4]), compat_ptr(a[5]));
 858                 break;
 859         case SYS_SHUTDOWN:
 860                 ret = sys_shutdown(a0, a1);
 861                 break;
 862         case SYS_SETSOCKOPT:
 863                 ret = compat_sys_setsockopt(a0, a1, a[2],
 864                                 compat_ptr(a[3]), a[4]);
 865                 break;
 866         case SYS_GETSOCKOPT:
 867                 ret = compat_sys_getsockopt(a0, a1, a[2],
 868                                 compat_ptr(a[3]), compat_ptr(a[4]));
 869                 break;
 870         case SYS_SENDMSG:
 871                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 872                 break;
 873         case SYS_SENDMMSG:
 874                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 875                 break;
 876         case SYS_RECVMSG:
 877                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 878                 break;
 879         case SYS_RECVMMSG:
 880                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 881                                           compat_ptr(a[4]));
 882                 break;
 883         case SYS_ACCEPT4:
 884                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 885                 break;
 886         default:
 887                 ret = -EINVAL;
 888                 break;
 889         }
 890         return ret;
 891 }