net/compat.c

   1 /*
   2  * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   3  *
   4  * Copyright (C) 2000           VA Linux Co
   5  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   6  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   9  * Copyright (C) 2000           Hewlett-Packard Co.
  10  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11  * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/gfp.h>
  16 #include <linux/fs.h>
  17 #include <linux/types.h>
  18 #include <linux/file.h>
  19 #include <linux/icmpv6.h>
  20 #include <linux/socket.h>
  21 #include <linux/syscalls.h>
  22 #include <linux/filter.h>
  23 #include <linux/compat.h>
  24 #include <linux/security.h>
  25 #include <linux/export.h>
  26
  27 #include <net/scm.h>
  28 #include <net/sock.h>
  29 #include <net/ip.h>
  30 #include <net/ipv6.h>
  31 #include <linux/uaccess.h>
  32 #include <net/compat.h>
  33
  34 int get_compat_msghdr(struct msghdr *kmsg,
  35                       struct compat_msghdr __user *umsg,
  36                       struct sockaddr __user **save_addr,
  37                       struct iovec **iov)
  38 {
  39         compat_uptr_t uaddr, uiov, tmp3;
  40         compat_size_t nr_segs;
  41         ssize_t err;
  42
  43         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  44             __get_user(uaddr, &umsg->msg_name) ||
  45             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  46             __get_user(uiov, &umsg->msg_iov) ||
  47             __get_user(nr_segs, &umsg->msg_iovlen) ||
  48             __get_user(tmp3, &umsg->msg_control) ||
  49             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  50             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  51                 return -EFAULT;
  52
  53         if (!uaddr)
  54                 kmsg->msg_namelen = 0;
  55
  56         if (kmsg->msg_namelen < 0)
  57                 return -EINVAL;
  58
  59         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  60                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  61         kmsg->msg_control = compat_ptr(tmp3);
  62
  63         if (save_addr)
  64                 *save_addr = compat_ptr(uaddr);
  65
  66         if (uaddr && kmsg->msg_namelen) {
  67                 if (!save_addr) {
  68                         err = move_addr_to_kernel(compat_ptr(uaddr),
  69                                                   kmsg->msg_namelen,
  70                                                   kmsg->msg_name);
  71                         if (err < 0)
  72                                 return err;
  73                 }
  74         } else {
  75                 kmsg->msg_name = NULL;
  76                 kmsg->msg_namelen = 0;
  77         }
  78
  79         if (nr_segs > UIO_MAXIOV)
  80                 return -EMSGSIZE;
  81
  82         kmsg->msg_iocb = NULL;
  83
  84         return compat_import_iovec(save_addr ? READ : WRITE,
  85                                    compat_ptr(uiov), nr_segs,
  86                                    UIO_FASTIOV, iov, &kmsg->msg_iter);
  87 }
  88
  89 /* Bleech... */
  90 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
  91
  92 #define CMSG_COMPAT_DATA(cmsg)                          \
  93         ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
  94 #define CMSG_COMPAT_SPACE(len)                          \
  95         (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
  96 #define CMSG_COMPAT_LEN(len)                            \
  97         (sizeof(struct compat_cmsghdr) + (len))
  98
  99 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 100         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 101          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 102          (struct compat_cmsghdr __user *)NULL)
 103
 104 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 105         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 106          (ucmlen) <= (unsigned long) \
 107          ((mhdr)->msg_controllen - \
 108           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 109
 110 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 111                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 112 {
 113         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 114         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 115                         msg->msg_controllen)
 116                 return NULL;
 117         return (struct compat_cmsghdr __user *)ptr;
 118 }
 119
 120 /* There is a lot of hair here because the alignment rules (and
 121  * thus placement) of cmsg headers and length are different for
 122  * 32-bit apps.  -DaveM
 123  */
 124 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 125                                unsigned char *stackbuf, int stackbuf_size)
 126 {
 127         struct compat_cmsghdr __user *ucmsg;
 128         struct cmsghdr *kcmsg, *kcmsg_base;
 129         compat_size_t ucmlen;
 130         __kernel_size_t kcmlen, tmp;
 131         int err = -EFAULT;
 132
 133         BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
 134                      CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
 135
 136         kcmlen = 0;
 137         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 138         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 139         while (ucmsg != NULL) {
 140                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 141                         return -EFAULT;
 142
 143                 /* Catch bogons. */
 144                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 145                         return -EINVAL;
 146
 147                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 148                 tmp = CMSG_ALIGN(tmp);
 149                 kcmlen += tmp;
 150                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 151         }
 152         if (kcmlen == 0)
 153                 return -EINVAL;
 154
 155         /* The kcmlen holds the 64-bit version of the control length.
 156          * It may not be modified as we do not stick it into the kmsg
 157          * until we have successfully copied over all of the data
 158          * from the user.
 159          */
 160         if (kcmlen > stackbuf_size)
 161                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 162         if (kcmsg == NULL)
 163                 return -ENOBUFS;
 164
 165         /* Now copy them over neatly. */
 166         memset(kcmsg, 0, kcmlen);
 167         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 168         while (ucmsg != NULL) {
 169                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 170                         goto Efault;
 171                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 172                         goto Einval;
 173                 tmp = ((ucmlen - sizeof(*ucmsg)) + 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 - 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 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
 314 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
 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 NULL;
 328
 329         return kfprog;
 330 }
 331 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
 332
 333 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 334                                 char __user *optval, unsigned int optlen)
 335 {
 336         struct sock_fprog __user *kfprog;
 337
 338         kfprog = get_compat_bpf_fprog(optval);
 339         if (!kfprog)
 340                 return -EFAULT;
 341
 342         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 343                               sizeof(struct sock_fprog));
 344 }
 345
 346 static int do_set_sock_timeout(struct socket *sock, int level,
 347                 int optname, char __user *optval, unsigned int optlen)
 348 {
 349         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 350         struct timeval ktime;
 351         mm_segment_t old_fs;
 352         int err;
 353
 354         if (optlen < sizeof(*up))
 355                 return -EINVAL;
 356         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 357             __get_user(ktime.tv_sec, &up->tv_sec) ||
 358             __get_user(ktime.tv_usec, &up->tv_usec))
 359                 return -EFAULT;
 360         old_fs = get_fs();
 361         set_fs(KERNEL_DS);
 362         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 363         set_fs(old_fs);
 364
 365         return err;
 366 }
 367
 368 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 369                                 char __user *optval, unsigned int optlen)
 370 {
 371         if (optname == SO_ATTACH_FILTER ||
 372             optname == SO_ATTACH_REUSEPORT_CBPF)
 373                 return do_set_attach_filter(sock, level, optname,
 374                                             optval, optlen);
 375         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 376                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 377
 378         return sock_setsockopt(sock, level, optname, optval, optlen);
 379 }
 380
 381 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 382                        char __user *, optval, unsigned int, optlen)
 383 {
 384         int err;
 385         struct socket *sock = sockfd_lookup(fd, &err);
 386
 387         if (sock) {
 388                 err = security_socket_setsockopt(sock, level, optname);
 389                 if (err) {
 390                         sockfd_put(sock);
 391                         return err;
 392                 }
 393
 394                 if (level == SOL_SOCKET)
 395                         err = compat_sock_setsockopt(sock, level,
 396                                         optname, optval, optlen);
 397                 else if (sock->ops->compat_setsockopt)
 398                         err = sock->ops->compat_setsockopt(sock, level,
 399                                         optname, optval, optlen);
 400                 else
 401                         err = sock->ops->setsockopt(sock, level,
 402                                         optname, optval, optlen);
 403                 sockfd_put(sock);
 404         }
 405         return err;
 406 }
 407
 408 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 409                 char __user *optval, int __user *optlen)
 410 {
 411         struct compat_timeval __user *up;
 412         struct timeval ktime;
 413         mm_segment_t old_fs;
 414         int len, err;
 415
 416         up = (struct compat_timeval __user *) optval;
 417         if (get_user(len, optlen))
 418                 return -EFAULT;
 419         if (len < sizeof(*up))
 420                 return -EINVAL;
 421         len = sizeof(ktime);
 422         old_fs = get_fs();
 423         set_fs(KERNEL_DS);
 424         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 425         set_fs(old_fs);
 426
 427         if (!err) {
 428                 if (put_user(sizeof(*up), optlen) ||
 429                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 430                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 431                     __put_user(ktime.tv_usec, &up->tv_usec))
 432                         err = -EFAULT;
 433         }
 434         return err;
 435 }
 436
 437 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 438                                 char __user *optval, int __user *optlen)
 439 {
 440         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 441                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 442         return sock_getsockopt(sock, level, optname, optval, optlen);
 443 }
 444
 445 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 446 {
 447         struct compat_timeval __user *ctv;
 448         int err;
 449         struct timeval tv;
 450
 451         if (COMPAT_USE_64BIT_TIME)
 452                 return sock_get_timestamp(sk, userstamp);
 453
 454         ctv = (struct compat_timeval __user *) userstamp;
 455         err = -ENOENT;
 456         if (!sock_flag(sk, SOCK_TIMESTAMP))
 457                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 458         tv = ktime_to_timeval(sk->sk_stamp);
 459         if (tv.tv_sec == -1)
 460                 return err;
 461         if (tv.tv_sec == 0) {
 462                 sk->sk_stamp = ktime_get_real();
 463                 tv = ktime_to_timeval(sk->sk_stamp);
 464         }
 465         err = 0;
 466         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 467                         put_user(tv.tv_usec, &ctv->tv_usec))
 468                 err = -EFAULT;
 469         return err;
 470 }
 471 EXPORT_SYMBOL(compat_sock_get_timestamp);
 472
 473 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 474 {
 475         struct compat_timespec __user *ctv;
 476         int err;
 477         struct timespec ts;
 478
 479         if (COMPAT_USE_64BIT_TIME)
 480                 return sock_get_timestampns (sk, userstamp);
 481
 482         ctv = (struct compat_timespec __user *) userstamp;
 483         err = -ENOENT;
 484         if (!sock_flag(sk, SOCK_TIMESTAMP))
 485                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 486         ts = ktime_to_timespec(sk->sk_stamp);
 487         if (ts.tv_sec == -1)
 488                 return err;
 489         if (ts.tv_sec == 0) {
 490                 sk->sk_stamp = ktime_get_real();
 491                 ts = ktime_to_timespec(sk->sk_stamp);
 492         }
 493         err = 0;
 494         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 495                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 496                 err = -EFAULT;
 497         return err;
 498 }
 499 EXPORT_SYMBOL(compat_sock_get_timestampns);
 500
 501 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 502                        char __user *, optval, int __user *, optlen)
 503 {
 504         int err;
 505         struct socket *sock = sockfd_lookup(fd, &err);
 506
 507         if (sock) {
 508                 err = security_socket_getsockopt(sock, level, optname);
 509                 if (err) {
 510                         sockfd_put(sock);
 511                         return err;
 512                 }
 513
 514                 if (level == SOL_SOCKET)
 515                         err = compat_sock_getsockopt(sock, level,
 516                                         optname, optval, optlen);
 517                 else if (sock->ops->compat_getsockopt)
 518                         err = sock->ops->compat_getsockopt(sock, level,
 519                                         optname, optval, optlen);
 520                 else
 521                         err = sock->ops->getsockopt(sock, level,
 522                                         optname, optval, optlen);
 523                 sockfd_put(sock);
 524         }
 525         return err;
 526 }
 527
 528 struct compat_group_req {
 529         __u32                            gr_interface;
 530         struct __kernel_sockaddr_storage gr_group
 531                 __aligned(4);
 532 } __packed;
 533
 534 struct compat_group_source_req {
 535         __u32                            gsr_interface;
 536         struct __kernel_sockaddr_storage gsr_group
 537                 __aligned(4);
 538         struct __kernel_sockaddr_storage gsr_source
 539                 __aligned(4);
 540 } __packed;
 541
 542 struct compat_group_filter {
 543         __u32                            gf_interface;
 544         struct __kernel_sockaddr_storage gf_group
 545                 __aligned(4);
 546         __u32                            gf_fmode;
 547         __u32                            gf_numsrc;
 548         struct __kernel_sockaddr_storage gf_slist[1]
 549                 __aligned(4);
 550 } __packed;
 551
 552 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 553                         sizeof(struct __kernel_sockaddr_storage))
 554
 555
 556 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 557         char __user *optval, unsigned int optlen,
 558         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 559 {
 560         char __user     *koptval = optval;
 561         int             koptlen = optlen;
 562
 563         switch (optname) {
 564         case MCAST_JOIN_GROUP:
 565         case MCAST_LEAVE_GROUP:
 566         {
 567                 struct compat_group_req __user *gr32 = (void *)optval;
 568                 struct group_req __user *kgr =
 569                         compat_alloc_user_space(sizeof(struct group_req));
 570                 u32 interface;
 571
 572                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 573                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 574                     __get_user(interface, &gr32->gr_interface) ||
 575                     __put_user(interface, &kgr->gr_interface) ||
 576                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 577                                 sizeof(kgr->gr_group)))
 578                         return -EFAULT;
 579                 koptval = (char __user *)kgr;
 580                 koptlen = sizeof(struct group_req);
 581                 break;
 582         }
 583         case MCAST_JOIN_SOURCE_GROUP:
 584         case MCAST_LEAVE_SOURCE_GROUP:
 585         case MCAST_BLOCK_SOURCE:
 586         case MCAST_UNBLOCK_SOURCE:
 587         {
 588                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 589                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 590                         sizeof(struct group_source_req));
 591                 u32 interface;
 592
 593                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 594                     !access_ok(VERIFY_WRITE, kgsr,
 595                         sizeof(struct group_source_req)) ||
 596                     __get_user(interface, &gsr32->gsr_interface) ||
 597                     __put_user(interface, &kgsr->gsr_interface) ||
 598                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 599                                 sizeof(kgsr->gsr_group)) ||
 600                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 601                                 sizeof(kgsr->gsr_source)))
 602                         return -EFAULT;
 603                 koptval = (char __user *)kgsr;
 604                 koptlen = sizeof(struct group_source_req);
 605                 break;
 606         }
 607         case MCAST_MSFILTER:
 608         {
 609                 struct compat_group_filter __user *gf32 = (void *)optval;
 610                 struct group_filter __user *kgf;
 611                 u32 interface, fmode, numsrc;
 612
 613                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 614                     __get_user(interface, &gf32->gf_interface) ||
 615                     __get_user(fmode, &gf32->gf_fmode) ||
 616                     __get_user(numsrc, &gf32->gf_numsrc))
 617                         return -EFAULT;
 618                 koptlen = optlen + sizeof(struct group_filter) -
 619                                 sizeof(struct compat_group_filter);
 620                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 621                         return -EINVAL;
 622                 kgf = compat_alloc_user_space(koptlen);
 623                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 624                     __put_user(interface, &kgf->gf_interface) ||
 625                     __put_user(fmode, &kgf->gf_fmode) ||
 626                     __put_user(numsrc, &kgf->gf_numsrc) ||
 627                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 628                                 sizeof(kgf->gf_group)) ||
 629                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 630                                 numsrc * sizeof(kgf->gf_slist[0]))))
 631                         return -EFAULT;
 632                 koptval = (char __user *)kgf;
 633                 break;
 634         }
 635
 636         default:
 637                 break;
 638         }
 639         return setsockopt(sock, level, optname, koptval, koptlen);
 640 }
 641 EXPORT_SYMBOL(compat_mc_setsockopt);
 642
 643 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 644         char __user *optval, int __user *optlen,
 645         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 646 {
 647         struct compat_group_filter __user *gf32 = (void *)optval;
 648         struct group_filter __user *kgf;
 649         int __user      *koptlen;
 650         u32 interface, fmode, numsrc;
 651         int klen, ulen, err;
 652
 653         if (optname != MCAST_MSFILTER)
 654                 return getsockopt(sock, level, optname, optval, optlen);
 655
 656         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 657         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 658             __get_user(ulen, optlen))
 659                 return -EFAULT;
 660
 661         /* adjust len for pad */
 662         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 663
 664         if (klen < GROUP_FILTER_SIZE(0))
 665                 return -EINVAL;
 666
 667         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 668             __put_user(klen, koptlen))
 669                 return -EFAULT;
 670
 671         /* have to allow space for previous compat_alloc_user_space, too */
 672         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 673
 674         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 675             __get_user(interface, &gf32->gf_interface) ||
 676             __get_user(fmode, &gf32->gf_fmode) ||
 677             __get_user(numsrc, &gf32->gf_numsrc) ||
 678             __put_user(interface, &kgf->gf_interface) ||
 679             __put_user(fmode, &kgf->gf_fmode) ||
 680             __put_user(numsrc, &kgf->gf_numsrc) ||
 681             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 682                 return -EFAULT;
 683
 684         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 685         if (err)
 686                 return err;
 687
 688         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 689             __get_user(klen, koptlen))
 690                 return -EFAULT;
 691
 692         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 693
 694         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 695             __put_user(ulen, optlen))
 696                 return -EFAULT;
 697
 698         if (!access_ok(VERIFY_READ, kgf, klen) ||
 699             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 700             __get_user(interface, &kgf->gf_interface) ||
 701             __get_user(fmode, &kgf->gf_fmode) ||
 702             __get_user(numsrc, &kgf->gf_numsrc) ||
 703             __put_user(interface, &gf32->gf_interface) ||
 704             __put_user(fmode, &gf32->gf_fmode) ||
 705             __put_user(numsrc, &gf32->gf_numsrc))
 706                 return -EFAULT;
 707         if (numsrc) {
 708                 int copylen;
 709
 710                 klen -= GROUP_FILTER_SIZE(0);
 711                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 712                 if (copylen > klen)
 713                         copylen = klen;
 714                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 715                         return -EFAULT;
 716         }
 717         return err;
 718 }
 719 EXPORT_SYMBOL(compat_mc_getsockopt);
 720
 721
 722 /* Argument list sizes for compat_sys_socketcall */
 723 #define AL(x) ((x) * sizeof(u32))
 724 static unsigned char nas[21] = {
 725         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 726         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 727         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 728         AL(4), AL(5), AL(4)
 729 };
 730 #undef AL
 731
 732 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 733 {
 734         return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 735 }
 736
 737 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 738                        unsigned int, vlen, unsigned int, flags)
 739 {
 740         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 741                               flags | MSG_CMSG_COMPAT);
 742 }
 743
 744 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 745 {
 746         return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 747 }
 748
 749 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 750 {
 751         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 752 }
 753
 754 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 755                        unsigned int, flags, struct sockaddr __user *, addr,
 756                        int __user *, addrlen)
 757 {
 758         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 759 }
 760
 761 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 762                        unsigned int, vlen, unsigned int, flags,
 763                        struct compat_timespec __user *, timeout)
 764 {
 765         int datagrams;
 766         struct timespec ktspec;
 767
 768         if (timeout == NULL)
 769                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 770                                       flags | MSG_CMSG_COMPAT, NULL);
 771
 772         if (compat_get_timespec(&ktspec, timeout))
 773                 return -EFAULT;
 774
 775         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 776                                    flags | MSG_CMSG_COMPAT, &ktspec);
 777         if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 778                 datagrams = -EFAULT;
 779
 780         return datagrams;
 781 }
 782
 783 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 784 {
 785         int ret;
 786         u32 a[6];
 787         u32 a0, a1;
 788
 789         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 790                 return -EINVAL;
 791         if (copy_from_user(a, args, nas[call]))
 792                 return -EFAULT;
 793         a0 = a[0];
 794         a1 = a[1];
 795
 796         switch (call) {
 797         case SYS_SOCKET:
 798                 ret = sys_socket(a0, a1, a[2]);
 799                 break;
 800         case SYS_BIND:
 801                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 802                 break;
 803         case SYS_CONNECT:
 804                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 805                 break;
 806         case SYS_LISTEN:
 807                 ret = sys_listen(a0, a1);
 808                 break;
 809         case SYS_ACCEPT:
 810                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 811                 break;
 812         case SYS_GETSOCKNAME:
 813                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 814                 break;
 815         case SYS_GETPEERNAME:
 816                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 817                 break;
 818         case SYS_SOCKETPAIR:
 819                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 820                 break;
 821         case SYS_SEND:
 822                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 823                 break;
 824         case SYS_SENDTO:
 825                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 826                 break;
 827         case SYS_RECV:
 828                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 829                 break;
 830         case SYS_RECVFROM:
 831                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 832                                           compat_ptr(a[4]), compat_ptr(a[5]));
 833                 break;
 834         case SYS_SHUTDOWN:
 835                 ret = sys_shutdown(a0, a1);
 836                 break;
 837         case SYS_SETSOCKOPT:
 838                 ret = compat_sys_setsockopt(a0, a1, a[2],
 839                                 compat_ptr(a[3]), a[4]);
 840                 break;
 841         case SYS_GETSOCKOPT:
 842                 ret = compat_sys_getsockopt(a0, a1, a[2],
 843                                 compat_ptr(a[3]), compat_ptr(a[4]));
 844                 break;
 845         case SYS_SENDMSG:
 846                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 847                 break;
 848         case SYS_SENDMMSG:
 849                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 850                 break;
 851         case SYS_RECVMSG:
 852                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 853                 break;
 854         case SYS_RECVMMSG:
 855                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 856                                           compat_ptr(a[4]));
 857                 break;
 858         case SYS_ACCEPT4:
 859                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 860                 break;
 861         default:
 862                 ret = -EINVAL;
 863                 break;
 864         }
 865         return ret;
 866 }