net/compat.c

   1 /*
   2  * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   3  *
   4  * Copyright (C) 2000           VA Linux Co
   5  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   6  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   9  * Copyright (C) 2000           Hewlett-Packard Co.
  10  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11  * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/gfp.h>
  16 #include <linux/fs.h>
  17 #include <linux/types.h>
  18 #include <linux/file.h>
  19 #include <linux/icmpv6.h>
  20 #include <linux/socket.h>
  21 #include <linux/syscalls.h>
  22 #include <linux/filter.h>
  23 #include <linux/compat.h>
  24 #include <linux/security.h>
  25 #include <linux/export.h>
  26
  27 #include <net/scm.h>
  28 #include <net/sock.h>
  29 #include <net/ip.h>
  30 #include <net/ipv6.h>
  31 #include <asm/uaccess.h>
  32 #include <net/compat.h>
  33
  34 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  35                                           struct compat_iovec __user *uiov32,
  36                                           int niov)
  37 {
  38         int tot_len = 0;
  39
  40         while (niov > 0) {
  41                 compat_uptr_t buf;
  42                 compat_size_t len;
  43
  44                 if (get_user(len, &uiov32->iov_len) ||
  45                     get_user(buf, &uiov32->iov_base))
  46                         return -EFAULT;
  47
  48                 if (len > INT_MAX - tot_len)
  49                         len = INT_MAX - tot_len;
  50
  51                 tot_len += len;
  52                 kiov->iov_base = compat_ptr(buf);
  53                 kiov->iov_len = (__kernel_size_t) len;
  54                 uiov32++;
  55                 kiov++;
  56                 niov--;
  57         }
  58         return tot_len;
  59 }
  60
  61 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  62 {
  63         compat_uptr_t tmp1, tmp2, tmp3;
  64
  65         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  66             __get_user(tmp1, &umsg->msg_name) ||
  67             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  68             __get_user(tmp2, &umsg->msg_iov) ||
  69             __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  70             __get_user(tmp3, &umsg->msg_control) ||
  71             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  72             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  73                 return -EFAULT;
  74
  75         if (!tmp1)
  76                 kmsg->msg_namelen = 0;
  77
  78         if (kmsg->msg_namelen < 0)
  79                 return -EINVAL;
  80
  81         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  82                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  83         kmsg->msg_name = compat_ptr(tmp1);
  84         kmsg->msg_iov = compat_ptr(tmp2);
  85         kmsg->msg_control = compat_ptr(tmp3);
  86         return 0;
  87 }
  88
  89 /* I've named the args so it is easy to tell whose space the pointers are in. */
  90 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  91                    struct sockaddr_storage *kern_address, int mode)
  92 {
  93         int tot_len;
  94
  95         if (kern_msg->msg_name && kern_msg->msg_namelen) {
  96                 if (mode == VERIFY_READ) {
  97                         int err = move_addr_to_kernel(kern_msg->msg_name,
  98                                                       kern_msg->msg_namelen,
  99                                                       kern_address);
 100                         if (err < 0)
 101                                 return err;
 102                 }
 103                 kern_msg->msg_name = kern_address;
 104         } else {
 105                 kern_msg->msg_name = NULL;
 106                 kern_msg->msg_namelen = 0;
 107         }
 108
 109         tot_len = iov_from_user_compat_to_kern(kern_iov,
 110                                           (struct compat_iovec __user *)kern_msg->msg_iov,
 111                                           kern_msg->msg_iovlen);
 112         if (tot_len >= 0)
 113                 kern_msg->msg_iov = kern_iov;
 114
 115         return tot_len;
 116 }
 117
 118 /* Bleech... */
 119 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 120
 121 #define CMSG_COMPAT_DATA(cmsg)                          \
 122         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 123 #define CMSG_COMPAT_SPACE(len)                          \
 124         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 125 #define CMSG_COMPAT_LEN(len)                            \
 126         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 127
 128 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 129         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 130          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 131          (struct compat_cmsghdr __user *)NULL)
 132
 133 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 134         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 135          (ucmlen) <= (unsigned long) \
 136          ((mhdr)->msg_controllen - \
 137           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 138
 139 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 140                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 141 {
 142         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 143         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 144                         msg->msg_controllen)
 145                 return NULL;
 146         return (struct compat_cmsghdr __user *)ptr;
 147 }
 148
 149 /* There is a lot of hair here because the alignment rules (and
 150  * thus placement) of cmsg headers and length are different for
 151  * 32-bit apps.  -DaveM
 152  */
 153 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 154                                unsigned char *stackbuf, int stackbuf_size)
 155 {
 156         struct compat_cmsghdr __user *ucmsg;
 157         struct cmsghdr *kcmsg, *kcmsg_base;
 158         compat_size_t ucmlen;
 159         __kernel_size_t kcmlen, tmp;
 160         int err = -EFAULT;
 161
 162         kcmlen = 0;
 163         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 164         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 165         while (ucmsg != NULL) {
 166                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 167                         return -EFAULT;
 168
 169                 /* Catch bogons. */
 170                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 171                         return -EINVAL;
 172
 173                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 174                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 175                 tmp = CMSG_ALIGN(tmp);
 176                 kcmlen += tmp;
 177                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 178         }
 179         if (kcmlen == 0)
 180                 return -EINVAL;
 181
 182         /* The kcmlen holds the 64-bit version of the control length.
 183          * It may not be modified as we do not stick it into the kmsg
 184          * until we have successfully copied over all of the data
 185          * from the user.
 186          */
 187         if (kcmlen > stackbuf_size)
 188                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 189         if (kcmsg == NULL)
 190                 return -ENOBUFS;
 191
 192         /* Now copy them over neatly. */
 193         memset(kcmsg, 0, kcmlen);
 194         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 195         while (ucmsg != NULL) {
 196                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 197                         goto Efault;
 198                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 199                         goto Einval;
 200                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 201                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 202                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 203                         goto Einval;
 204                 kcmsg->cmsg_len = tmp;
 205                 tmp = CMSG_ALIGN(tmp);
 206                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 207                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 208                     copy_from_user(CMSG_DATA(kcmsg),
 209                                    CMSG_COMPAT_DATA(ucmsg),
 210                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 211                         goto Efault;
 212
 213                 /* Advance. */
 214                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 215                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 216         }
 217
 218         /* Ok, looks like we made it.  Hook it up and return success. */
 219         kmsg->msg_control = kcmsg_base;
 220         kmsg->msg_controllen = kcmlen;
 221         return 0;
 222
 223 Einval:
 224         err = -EINVAL;
 225 Efault:
 226         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 227                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 228         return err;
 229 }
 230
 231 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 232 {
 233         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 234         struct compat_cmsghdr cmhdr;
 235         struct compat_timeval ctv;
 236         struct compat_timespec cts[3];
 237         int cmlen;
 238
 239         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 240                 kmsg->msg_flags |= MSG_CTRUNC;
 241                 return 0; /* XXX: return error? check spec. */
 242         }
 243
 244         if (!COMPAT_USE_64BIT_TIME) {
 245                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 246                         struct timeval *tv = (struct timeval *)data;
 247                         ctv.tv_sec = tv->tv_sec;
 248                         ctv.tv_usec = tv->tv_usec;
 249                         data = &ctv;
 250                         len = sizeof(ctv);
 251                 }
 252                 if (level == SOL_SOCKET &&
 253                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 254                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 255                         int i;
 256                         struct timespec *ts = (struct timespec *)data;
 257                         for (i = 0; i < count; i++) {
 258                                 cts[i].tv_sec = ts[i].tv_sec;
 259                                 cts[i].tv_nsec = ts[i].tv_nsec;
 260                         }
 261                         data = &cts;
 262                         len = sizeof(cts[0]) * count;
 263                 }
 264         }
 265
 266         cmlen = CMSG_COMPAT_LEN(len);
 267         if (kmsg->msg_controllen < cmlen) {
 268                 kmsg->msg_flags |= MSG_CTRUNC;
 269                 cmlen = kmsg->msg_controllen;
 270         }
 271         cmhdr.cmsg_level = level;
 272         cmhdr.cmsg_type = type;
 273         cmhdr.cmsg_len = cmlen;
 274
 275         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 276                 return -EFAULT;
 277         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 278                 return -EFAULT;
 279         cmlen = CMSG_COMPAT_SPACE(len);
 280         if (kmsg->msg_controllen < cmlen)
 281                 cmlen = kmsg->msg_controllen;
 282         kmsg->msg_control += cmlen;
 283         kmsg->msg_controllen -= cmlen;
 284         return 0;
 285 }
 286
 287 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 288 {
 289         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 290         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 291         int fdnum = scm->fp->count;
 292         struct file **fp = scm->fp->fp;
 293         int __user *cmfptr;
 294         int err = 0, i;
 295
 296         if (fdnum < fdmax)
 297                 fdmax = fdnum;
 298
 299         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 300                 int new_fd;
 301                 err = security_file_receive(fp[i]);
 302                 if (err)
 303                         break;
 304                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 305                                           ? O_CLOEXEC : 0);
 306                 if (err < 0)
 307                         break;
 308                 new_fd = err;
 309                 err = put_user(new_fd, cmfptr);
 310                 if (err) {
 311                         put_unused_fd(new_fd);
 312                         break;
 313                 }
 314                 /* Bump the usage count and install the file. */
 315                 fd_install(new_fd, get_file(fp[i]));
 316         }
 317
 318         if (i > 0) {
 319                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 320                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 321                 if (!err)
 322                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 323                 if (!err)
 324                         err = put_user(cmlen, &cm->cmsg_len);
 325                 if (!err) {
 326                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 327                         kmsg->msg_control += cmlen;
 328                         kmsg->msg_controllen -= cmlen;
 329                 }
 330         }
 331         if (i < fdnum)
 332                 kmsg->msg_flags |= MSG_CTRUNC;
 333
 334         /*
 335          * All of the files that fit in the message have had their
 336          * usage counts incremented, so we just free the list.
 337          */
 338         __scm_destroy(scm);
 339 }
 340
 341 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 342                                 char __user *optval, unsigned int optlen)
 343 {
 344         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 345         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 346         compat_uptr_t ptr;
 347         u16 len;
 348
 349         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 350             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 351             __get_user(len, &fprog32->len) ||
 352             __get_user(ptr, &fprog32->filter) ||
 353             __put_user(len, &kfprog->len) ||
 354             __put_user(compat_ptr(ptr), &kfprog->filter))
 355                 return -EFAULT;
 356
 357         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 358                               sizeof(struct sock_fprog));
 359 }
 360
 361 static int do_set_sock_timeout(struct socket *sock, int level,
 362                 int optname, char __user *optval, unsigned int optlen)
 363 {
 364         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 365         struct timeval ktime;
 366         mm_segment_t old_fs;
 367         int err;
 368
 369         if (optlen < sizeof(*up))
 370                 return -EINVAL;
 371         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 372             __get_user(ktime.tv_sec, &up->tv_sec) ||
 373             __get_user(ktime.tv_usec, &up->tv_usec))
 374                 return -EFAULT;
 375         old_fs = get_fs();
 376         set_fs(KERNEL_DS);
 377         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 378         set_fs(old_fs);
 379
 380         return err;
 381 }
 382
 383 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 384                                 char __user *optval, unsigned int optlen)
 385 {
 386         if (optname == SO_ATTACH_FILTER)
 387                 return do_set_attach_filter(sock, level, optname,
 388                                             optval, optlen);
 389         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 390                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 391
 392         return sock_setsockopt(sock, level, optname, optval, optlen);
 393 }
 394
 395 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 396                                 char __user *optval, unsigned int optlen)
 397 {
 398         int err;
 399         struct socket *sock = sockfd_lookup(fd, &err);
 400
 401         if (sock) {
 402                 err = security_socket_setsockopt(sock, level, optname);
 403                 if (err) {
 404                         sockfd_put(sock);
 405                         return err;
 406                 }
 407
 408                 if (level == SOL_SOCKET)
 409                         err = compat_sock_setsockopt(sock, level,
 410                                         optname, optval, optlen);
 411                 else if (sock->ops->compat_setsockopt)
 412                         err = sock->ops->compat_setsockopt(sock, level,
 413                                         optname, optval, optlen);
 414                 else
 415                         err = sock->ops->setsockopt(sock, level,
 416                                         optname, optval, optlen);
 417                 sockfd_put(sock);
 418         }
 419         return err;
 420 }
 421
 422 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 423                 char __user *optval, int __user *optlen)
 424 {
 425         struct compat_timeval __user *up;
 426         struct timeval ktime;
 427         mm_segment_t old_fs;
 428         int len, err;
 429
 430         up = (struct compat_timeval __user *) optval;
 431         if (get_user(len, optlen))
 432                 return -EFAULT;
 433         if (len < sizeof(*up))
 434                 return -EINVAL;
 435         len = sizeof(ktime);
 436         old_fs = get_fs();
 437         set_fs(KERNEL_DS);
 438         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 439         set_fs(old_fs);
 440
 441         if (!err) {
 442                 if (put_user(sizeof(*up), optlen) ||
 443                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 444                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 445                     __put_user(ktime.tv_usec, &up->tv_usec))
 446                         err = -EFAULT;
 447         }
 448         return err;
 449 }
 450
 451 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 452                                 char __user *optval, int __user *optlen)
 453 {
 454         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 455                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 456         return sock_getsockopt(sock, level, optname, optval, optlen);
 457 }
 458
 459 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 460 {
 461         struct compat_timeval __user *ctv;
 462         int err;
 463         struct timeval tv;
 464
 465         if (COMPAT_USE_64BIT_TIME)
 466                 return sock_get_timestamp(sk, userstamp);
 467
 468         ctv = (struct compat_timeval __user *) userstamp;
 469         err = -ENOENT;
 470         if (!sock_flag(sk, SOCK_TIMESTAMP))
 471                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 472         tv = ktime_to_timeval(sk->sk_stamp);
 473         if (tv.tv_sec == -1)
 474                 return err;
 475         if (tv.tv_sec == 0) {
 476                 sk->sk_stamp = ktime_get_real();
 477                 tv = ktime_to_timeval(sk->sk_stamp);
 478         }
 479         err = 0;
 480         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 481                         put_user(tv.tv_usec, &ctv->tv_usec))
 482                 err = -EFAULT;
 483         return err;
 484 }
 485 EXPORT_SYMBOL(compat_sock_get_timestamp);
 486
 487 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 488 {
 489         struct compat_timespec __user *ctv;
 490         int err;
 491         struct timespec ts;
 492
 493         if (COMPAT_USE_64BIT_TIME)
 494                 return sock_get_timestampns (sk, userstamp);
 495
 496         ctv = (struct compat_timespec __user *) userstamp;
 497         err = -ENOENT;
 498         if (!sock_flag(sk, SOCK_TIMESTAMP))
 499                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 500         ts = ktime_to_timespec(sk->sk_stamp);
 501         if (ts.tv_sec == -1)
 502                 return err;
 503         if (ts.tv_sec == 0) {
 504                 sk->sk_stamp = ktime_get_real();
 505                 ts = ktime_to_timespec(sk->sk_stamp);
 506         }
 507         err = 0;
 508         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 509                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 510                 err = -EFAULT;
 511         return err;
 512 }
 513 EXPORT_SYMBOL(compat_sock_get_timestampns);
 514
 515 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 516                                 char __user *optval, int __user *optlen)
 517 {
 518         int err;
 519         struct socket *sock = sockfd_lookup(fd, &err);
 520
 521         if (sock) {
 522                 err = security_socket_getsockopt(sock, level, optname);
 523                 if (err) {
 524                         sockfd_put(sock);
 525                         return err;
 526                 }
 527
 528                 if (level == SOL_SOCKET)
 529                         err = compat_sock_getsockopt(sock, level,
 530                                         optname, optval, optlen);
 531                 else if (sock->ops->compat_getsockopt)
 532                         err = sock->ops->compat_getsockopt(sock, level,
 533                                         optname, optval, optlen);
 534                 else
 535                         err = sock->ops->getsockopt(sock, level,
 536                                         optname, optval, optlen);
 537                 sockfd_put(sock);
 538         }
 539         return err;
 540 }
 541
 542 struct compat_group_req {
 543         __u32                            gr_interface;
 544         struct __kernel_sockaddr_storage gr_group
 545                 __attribute__ ((aligned(4)));
 546 } __packed;
 547
 548 struct compat_group_source_req {
 549         __u32                            gsr_interface;
 550         struct __kernel_sockaddr_storage gsr_group
 551                 __attribute__ ((aligned(4)));
 552         struct __kernel_sockaddr_storage gsr_source
 553                 __attribute__ ((aligned(4)));
 554 } __packed;
 555
 556 struct compat_group_filter {
 557         __u32                            gf_interface;
 558         struct __kernel_sockaddr_storage gf_group
 559                 __attribute__ ((aligned(4)));
 560         __u32                            gf_fmode;
 561         __u32                            gf_numsrc;
 562         struct __kernel_sockaddr_storage gf_slist[1]
 563                 __attribute__ ((aligned(4)));
 564 } __packed;
 565
 566 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 567                         sizeof(struct __kernel_sockaddr_storage))
 568
 569
 570 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 571         char __user *optval, unsigned int optlen,
 572         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 573 {
 574         char __user     *koptval = optval;
 575         int             koptlen = optlen;
 576
 577         switch (optname) {
 578         case MCAST_JOIN_GROUP:
 579         case MCAST_LEAVE_GROUP:
 580         {
 581                 struct compat_group_req __user *gr32 = (void *)optval;
 582                 struct group_req __user *kgr =
 583                         compat_alloc_user_space(sizeof(struct group_req));
 584                 u32 interface;
 585
 586                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 587                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 588                     __get_user(interface, &gr32->gr_interface) ||
 589                     __put_user(interface, &kgr->gr_interface) ||
 590                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 591                                 sizeof(kgr->gr_group)))
 592                         return -EFAULT;
 593                 koptval = (char __user *)kgr;
 594                 koptlen = sizeof(struct group_req);
 595                 break;
 596         }
 597         case MCAST_JOIN_SOURCE_GROUP:
 598         case MCAST_LEAVE_SOURCE_GROUP:
 599         case MCAST_BLOCK_SOURCE:
 600         case MCAST_UNBLOCK_SOURCE:
 601         {
 602                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 603                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 604                         sizeof(struct group_source_req));
 605                 u32 interface;
 606
 607                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 608                     !access_ok(VERIFY_WRITE, kgsr,
 609                         sizeof(struct group_source_req)) ||
 610                     __get_user(interface, &gsr32->gsr_interface) ||
 611                     __put_user(interface, &kgsr->gsr_interface) ||
 612                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 613                                 sizeof(kgsr->gsr_group)) ||
 614                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 615                                 sizeof(kgsr->gsr_source)))
 616                         return -EFAULT;
 617                 koptval = (char __user *)kgsr;
 618                 koptlen = sizeof(struct group_source_req);
 619                 break;
 620         }
 621         case MCAST_MSFILTER:
 622         {
 623                 struct compat_group_filter __user *gf32 = (void *)optval;
 624                 struct group_filter __user *kgf;
 625                 u32 interface, fmode, numsrc;
 626
 627                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 628                     __get_user(interface, &gf32->gf_interface) ||
 629                     __get_user(fmode, &gf32->gf_fmode) ||
 630                     __get_user(numsrc, &gf32->gf_numsrc))
 631                         return -EFAULT;
 632                 koptlen = optlen + sizeof(struct group_filter) -
 633                                 sizeof(struct compat_group_filter);
 634                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 635                         return -EINVAL;
 636                 kgf = compat_alloc_user_space(koptlen);
 637                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 638                     __put_user(interface, &kgf->gf_interface) ||
 639                     __put_user(fmode, &kgf->gf_fmode) ||
 640                     __put_user(numsrc, &kgf->gf_numsrc) ||
 641                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 642                                 sizeof(kgf->gf_group)) ||
 643                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 644                                 numsrc * sizeof(kgf->gf_slist[0]))))
 645                         return -EFAULT;
 646                 koptval = (char __user *)kgf;
 647                 break;
 648         }
 649
 650         default:
 651                 break;
 652         }
 653         return setsockopt(sock, level, optname, koptval, koptlen);
 654 }
 655 EXPORT_SYMBOL(compat_mc_setsockopt);
 656
 657 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 658         char __user *optval, int __user *optlen,
 659         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 660 {
 661         struct compat_group_filter __user *gf32 = (void *)optval;
 662         struct group_filter __user *kgf;
 663         int __user      *koptlen;
 664         u32 interface, fmode, numsrc;
 665         int klen, ulen, err;
 666
 667         if (optname != MCAST_MSFILTER)
 668                 return getsockopt(sock, level, optname, optval, optlen);
 669
 670         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 671         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 672             __get_user(ulen, optlen))
 673                 return -EFAULT;
 674
 675         /* adjust len for pad */
 676         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 677
 678         if (klen < GROUP_FILTER_SIZE(0))
 679                 return -EINVAL;
 680
 681         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 682             __put_user(klen, koptlen))
 683                 return -EFAULT;
 684
 685         /* have to allow space for previous compat_alloc_user_space, too */
 686         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 687
 688         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 689             __get_user(interface, &gf32->gf_interface) ||
 690             __get_user(fmode, &gf32->gf_fmode) ||
 691             __get_user(numsrc, &gf32->gf_numsrc) ||
 692             __put_user(interface, &kgf->gf_interface) ||
 693             __put_user(fmode, &kgf->gf_fmode) ||
 694             __put_user(numsrc, &kgf->gf_numsrc) ||
 695             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 696                 return -EFAULT;
 697
 698         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 699         if (err)
 700                 return err;
 701
 702         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 703             __get_user(klen, koptlen))
 704                 return -EFAULT;
 705
 706         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 707
 708         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 709             __put_user(ulen, optlen))
 710                 return -EFAULT;
 711
 712         if (!access_ok(VERIFY_READ, kgf, klen) ||
 713             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 714             __get_user(interface, &kgf->gf_interface) ||
 715             __get_user(fmode, &kgf->gf_fmode) ||
 716             __get_user(numsrc, &kgf->gf_numsrc) ||
 717             __put_user(interface, &gf32->gf_interface) ||
 718             __put_user(fmode, &gf32->gf_fmode) ||
 719             __put_user(numsrc, &gf32->gf_numsrc))
 720                 return -EFAULT;
 721         if (numsrc) {
 722                 int copylen;
 723
 724                 klen -= GROUP_FILTER_SIZE(0);
 725                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 726                 if (copylen > klen)
 727                         copylen = klen;
 728                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 729                         return -EFAULT;
 730         }
 731         return err;
 732 }
 733 EXPORT_SYMBOL(compat_mc_getsockopt);
 734
 735
 736 /* Argument list sizes for compat_sys_socketcall */
 737 #define AL(x) ((x) * sizeof(u32))
 738 static unsigned char nas[21] = {
 739         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 740         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 741         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 742         AL(4), AL(5), AL(4)
 743 };
 744 #undef AL
 745
 746 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 747 {
 748         return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 749 }
 750
 751 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 752                                     unsigned int vlen, unsigned int flags)
 753 {
 754         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 755                               flags | MSG_CMSG_COMPAT);
 756 }
 757
 758 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 759 {
 760         return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 761 }
 762
 763 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
 764 {
 765         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 766 }
 767
 768 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
 769                                     unsigned int flags, struct sockaddr __user *addr,
 770                                     int __user *addrlen)
 771 {
 772         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 773 }
 774
 775 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 776                                     unsigned int vlen, unsigned int flags,
 777                                     struct compat_timespec __user *timeout)
 778 {
 779         int datagrams;
 780         struct timespec ktspec;
 781
 782         if (timeout == NULL)
 783                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 784                                       flags | MSG_CMSG_COMPAT, NULL);
 785
 786         if (compat_get_timespec(&ktspec, timeout))
 787                 return -EFAULT;
 788
 789         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 790                                    flags | MSG_CMSG_COMPAT, &ktspec);
 791         if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 792                 datagrams = -EFAULT;
 793
 794         return datagrams;
 795 }
 796
 797 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 798 {
 799         int ret;
 800         u32 a[6];
 801         u32 a0, a1;
 802
 803         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 804                 return -EINVAL;
 805         if (copy_from_user(a, args, nas[call]))
 806                 return -EFAULT;
 807         a0 = a[0];
 808         a1 = a[1];
 809
 810         switch (call) {
 811         case SYS_SOCKET:
 812                 ret = sys_socket(a0, a1, a[2]);
 813                 break;
 814         case SYS_BIND:
 815                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 816                 break;
 817         case SYS_CONNECT:
 818                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 819                 break;
 820         case SYS_LISTEN:
 821                 ret = sys_listen(a0, a1);
 822                 break;
 823         case SYS_ACCEPT:
 824                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 825                 break;
 826         case SYS_GETSOCKNAME:
 827                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 828                 break;
 829         case SYS_GETPEERNAME:
 830                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 831                 break;
 832         case SYS_SOCKETPAIR:
 833                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 834                 break;
 835         case SYS_SEND:
 836                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 837                 break;
 838         case SYS_SENDTO:
 839                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 840                 break;
 841         case SYS_RECV:
 842                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 843                 break;
 844         case SYS_RECVFROM:
 845                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 846                                           compat_ptr(a[4]), compat_ptr(a[5]));
 847                 break;
 848         case SYS_SHUTDOWN:
 849                 ret = sys_shutdown(a0, a1);
 850                 break;
 851         case SYS_SETSOCKOPT:
 852                 ret = compat_sys_setsockopt(a0, a1, a[2],
 853                                 compat_ptr(a[3]), a[4]);
 854                 break;
 855         case SYS_GETSOCKOPT:
 856                 ret = compat_sys_getsockopt(a0, a1, a[2],
 857                                 compat_ptr(a[3]), compat_ptr(a[4]));
 858                 break;
 859         case SYS_SENDMSG:
 860                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 861                 break;
 862         case SYS_SENDMMSG:
 863                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 864                 break;
 865         case SYS_RECVMSG:
 866                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 867                 break;
 868         case SYS_RECVMMSG:
 869                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 870                                           compat_ptr(a[4]));
 871                 break;
 872         case SYS_ACCEPT4:
 873                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 874                 break;
 875         default:
 876                 ret = -EINVAL;
 877                 break;
 878         }
 879         return ret;
 880 }