net/compat.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   4  *
   5  * Copyright (C) 2000           VA Linux Co
   6  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   7  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   8  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   9  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
  10  * Copyright (C) 2000           Hewlett-Packard Co.
  11  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  12  * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/gfp.h>
  17 #include <linux/fs.h>
  18 #include <linux/types.h>
  19 #include <linux/file.h>
  20 #include <linux/icmpv6.h>
  21 #include <linux/socket.h>
  22 #include <linux/syscalls.h>
  23 #include <linux/filter.h>
  24 #include <linux/compat.h>
  25 #include <linux/security.h>
  26 #include <linux/audit.h>
  27 #include <linux/export.h>
  28
  29 #include <net/scm.h>
  30 #include <net/sock.h>
  31 #include <net/ip.h>
  32 #include <net/ipv6.h>
  33 #include <linux/uaccess.h>
  34 #include <net/compat.h>
  35
  36 int get_compat_msghdr(struct msghdr *kmsg,
  37                       struct compat_msghdr __user *umsg,
  38                       struct sockaddr __user **save_addr,
  39                       struct iovec **iov)
  40 {
  41         struct compat_msghdr msg;
  42         ssize_t err;
  43
  44         if (copy_from_user(&msg, umsg, sizeof(*umsg)))
  45                 return -EFAULT;
  46
  47         kmsg->msg_flags = msg.msg_flags;
  48         kmsg->msg_namelen = msg.msg_namelen;
  49
  50         if (!msg.msg_name)
  51                 kmsg->msg_namelen = 0;
  52
  53         if (kmsg->msg_namelen < 0)
  54                 return -EINVAL;
  55
  56         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  57                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  58
  59         kmsg->msg_control = compat_ptr(msg.msg_control);
  60         kmsg->msg_controllen = msg.msg_controllen;
  61
  62         if (save_addr)
  63                 *save_addr = compat_ptr(msg.msg_name);
  64
  65         if (msg.msg_name && kmsg->msg_namelen) {
  66                 if (!save_addr) {
  67                         err = move_addr_to_kernel(compat_ptr(msg.msg_name),
  68                                                   kmsg->msg_namelen,
  69                                                   kmsg->msg_name);
  70                         if (err < 0)
  71                                 return err;
  72                 }
  73         } else {
  74                 kmsg->msg_name = NULL;
  75                 kmsg->msg_namelen = 0;
  76         }
  77
  78         if (msg.msg_iovlen > UIO_MAXIOV)
  79                 return -EMSGSIZE;
  80
  81         kmsg->msg_iocb = NULL;
  82
  83         return compat_import_iovec(save_addr ? READ : WRITE,
  84                                    compat_ptr(msg.msg_iov), msg.msg_iovlen,
  85                                    UIO_FASTIOV, iov, &kmsg->msg_iter);
  86 }
  87
  88 /* Bleech... */
  89 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
  90
  91 #define CMSG_COMPAT_DATA(cmsg)                          \
  92         ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
  93 #define CMSG_COMPAT_SPACE(len)                          \
  94         (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
  95 #define CMSG_COMPAT_LEN(len)                            \
  96         (sizeof(struct compat_cmsghdr) + (len))
  97
  98 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
  99         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 100          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 101          (struct compat_cmsghdr __user *)NULL)
 102
 103 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 104         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 105          (ucmlen) <= (unsigned long) \
 106          ((mhdr)->msg_controllen - \
 107           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 108
 109 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 110                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 111 {
 112         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 113         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 114                         msg->msg_controllen)
 115                 return NULL;
 116         return (struct compat_cmsghdr __user *)ptr;
 117 }
 118
 119 /* There is a lot of hair here because the alignment rules (and
 120  * thus placement) of cmsg headers and length are different for
 121  * 32-bit apps.  -DaveM
 122  */
 123 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 124                                unsigned char *stackbuf, int stackbuf_size)
 125 {
 126         struct compat_cmsghdr __user *ucmsg;
 127         struct cmsghdr *kcmsg, *kcmsg_base;
 128         compat_size_t ucmlen;
 129         __kernel_size_t kcmlen, tmp;
 130         int err = -EFAULT;
 131
 132         BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
 133                      CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
 134
 135         kcmlen = 0;
 136         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 137         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 138         while (ucmsg != NULL) {
 139                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 140                         return -EFAULT;
 141
 142                 /* Catch bogons. */
 143                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 144                         return -EINVAL;
 145
 146                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 147                 tmp = CMSG_ALIGN(tmp);
 148                 kcmlen += tmp;
 149                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 150         }
 151         if (kcmlen == 0)
 152                 return -EINVAL;
 153
 154         /* The kcmlen holds the 64-bit version of the control length.
 155          * It may not be modified as we do not stick it into the kmsg
 156          * until we have successfully copied over all of the data
 157          * from the user.
 158          */
 159         if (kcmlen > stackbuf_size)
 160                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 161         if (kcmsg == NULL)
 162                 return -ENOBUFS;
 163
 164         /* Now copy them over neatly. */
 165         memset(kcmsg, 0, kcmlen);
 166         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 167         while (ucmsg != NULL) {
 168                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 169                         goto Efault;
 170                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 171                         goto Einval;
 172                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 173                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 174                         goto Einval;
 175                 kcmsg->cmsg_len = tmp;
 176                 tmp = CMSG_ALIGN(tmp);
 177                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 178                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 179                     copy_from_user(CMSG_DATA(kcmsg),
 180                                    CMSG_COMPAT_DATA(ucmsg),
 181                                    (ucmlen - sizeof(*ucmsg))))
 182                         goto Efault;
 183
 184                 /* Advance. */
 185                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 186                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 187         }
 188
 189         /*
 190          * check the length of messages copied in is the same as the
 191          * what we get from the first loop
 192          */
 193         if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
 194                 goto Einval;
 195
 196         /* Ok, looks like we made it.  Hook it up and return success. */
 197         kmsg->msg_control = kcmsg_base;
 198         kmsg->msg_controllen = kcmlen;
 199         return 0;
 200
 201 Einval:
 202         err = -EINVAL;
 203 Efault:
 204         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 205                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 206         return err;
 207 }
 208
 209 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 210 {
 211         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 212         struct compat_cmsghdr cmhdr;
 213         struct old_timeval32 ctv;
 214         struct old_timespec32 cts[3];
 215         int cmlen;
 216
 217         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 218                 kmsg->msg_flags |= MSG_CTRUNC;
 219                 return 0; /* XXX: return error? check spec. */
 220         }
 221
 222         if (!COMPAT_USE_64BIT_TIME) {
 223                 if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) {
 224                         struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data;
 225                         ctv.tv_sec = tv->tv_sec;
 226                         ctv.tv_usec = tv->tv_usec;
 227                         data = &ctv;
 228                         len = sizeof(ctv);
 229                 }
 230                 if (level == SOL_SOCKET &&
 231                     (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) {
 232                         int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3;
 233                         int i;
 234                         struct timespec *ts = (struct timespec *)data;
 235                         for (i = 0; i < count; i++) {
 236                                 cts[i].tv_sec = ts[i].tv_sec;
 237                                 cts[i].tv_nsec = ts[i].tv_nsec;
 238                         }
 239                         data = &cts;
 240                         len = sizeof(cts[0]) * count;
 241                 }
 242         }
 243
 244         cmlen = CMSG_COMPAT_LEN(len);
 245         if (kmsg->msg_controllen < cmlen) {
 246                 kmsg->msg_flags |= MSG_CTRUNC;
 247                 cmlen = kmsg->msg_controllen;
 248         }
 249         cmhdr.cmsg_level = level;
 250         cmhdr.cmsg_type = type;
 251         cmhdr.cmsg_len = cmlen;
 252
 253         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 254                 return -EFAULT;
 255         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 256                 return -EFAULT;
 257         cmlen = CMSG_COMPAT_SPACE(len);
 258         if (kmsg->msg_controllen < cmlen)
 259                 cmlen = kmsg->msg_controllen;
 260         kmsg->msg_control += cmlen;
 261         kmsg->msg_controllen -= cmlen;
 262         return 0;
 263 }
 264
 265 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 266 {
 267         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 268         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 269         int fdnum = scm->fp->count;
 270         struct file **fp = scm->fp->fp;
 271         int __user *cmfptr;
 272         int err = 0, i;
 273
 274         if (fdnum < fdmax)
 275                 fdmax = fdnum;
 276
 277         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 278                 int new_fd;
 279                 err = security_file_receive(fp[i]);
 280                 if (err)
 281                         break;
 282                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 283                                           ? O_CLOEXEC : 0);
 284                 if (err < 0)
 285                         break;
 286                 new_fd = err;
 287                 err = put_user(new_fd, cmfptr);
 288                 if (err) {
 289                         put_unused_fd(new_fd);
 290                         break;
 291                 }
 292                 /* Bump the usage count and install the file. */
 293                 fd_install(new_fd, get_file(fp[i]));
 294         }
 295
 296         if (i > 0) {
 297                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 298                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 299                 if (!err)
 300                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 301                 if (!err)
 302                         err = put_user(cmlen, &cm->cmsg_len);
 303                 if (!err) {
 304                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 305                         kmsg->msg_control += cmlen;
 306                         kmsg->msg_controllen -= cmlen;
 307                 }
 308         }
 309         if (i < fdnum)
 310                 kmsg->msg_flags |= MSG_CTRUNC;
 311
 312         /*
 313          * All of the files that fit in the message have had their
 314          * usage counts incremented, so we just free the list.
 315          */
 316         __scm_destroy(scm);
 317 }
 318
 319 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
 320 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
 321 {
 322         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 323         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 324         struct compat_sock_fprog f32;
 325         struct sock_fprog f;
 326
 327         if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
 328                 return NULL;
 329         memset(&f, 0, sizeof(f));
 330         f.len = f32.len;
 331         f.filter = compat_ptr(f32.filter);
 332         if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
 333                 return NULL;
 334
 335         return kfprog;
 336 }
 337 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
 338
 339 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 340                                 char __user *optval, unsigned int optlen)
 341 {
 342         struct sock_fprog __user *kfprog;
 343
 344         kfprog = get_compat_bpf_fprog(optval);
 345         if (!kfprog)
 346                 return -EFAULT;
 347
 348         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 349                               sizeof(struct sock_fprog));
 350 }
 351
 352 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 353                                 char __user *optval, unsigned int optlen)
 354 {
 355         if (optname == SO_ATTACH_FILTER ||
 356             optname == SO_ATTACH_REUSEPORT_CBPF)
 357                 return do_set_attach_filter(sock, level, optname,
 358                                             optval, optlen);
 359         return sock_setsockopt(sock, level, optname, optval, optlen);
 360 }
 361
 362 static int __compat_sys_setsockopt(int fd, int level, int optname,
 363                                    char __user *optval, unsigned int optlen)
 364 {
 365         int err;
 366         struct socket *sock;
 367
 368         if (optlen > INT_MAX)
 369                 return -EINVAL;
 370
 371         sock = sockfd_lookup(fd, &err);
 372         if (sock) {
 373                 err = security_socket_setsockopt(sock, level, optname);
 374                 if (err) {
 375                         sockfd_put(sock);
 376                         return err;
 377                 }
 378
 379                 if (level == SOL_SOCKET)
 380                         err = compat_sock_setsockopt(sock, level,
 381                                         optname, optval, optlen);
 382                 else if (sock->ops->compat_setsockopt)
 383                         err = sock->ops->compat_setsockopt(sock, level,
 384                                         optname, optval, optlen);
 385                 else
 386                         err = sock->ops->setsockopt(sock, level,
 387                                         optname, optval, optlen);
 388                 sockfd_put(sock);
 389         }
 390         return err;
 391 }
 392
 393 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 394                        char __user *, optval, unsigned int, optlen)
 395 {
 396         return __compat_sys_setsockopt(fd, level, optname, optval, optlen);
 397 }
 398
 399 static int __compat_sys_getsockopt(int fd, int level, int optname,
 400                                    char __user *optval,
 401                                    int __user *optlen)
 402 {
 403         int err;
 404         struct socket *sock = sockfd_lookup(fd, &err);
 405
 406         if (sock) {
 407                 err = security_socket_getsockopt(sock, level, optname);
 408                 if (err) {
 409                         sockfd_put(sock);
 410                         return err;
 411                 }
 412
 413                 if (level == SOL_SOCKET)
 414                         err = sock_getsockopt(sock, level,
 415                                         optname, optval, optlen);
 416                 else if (sock->ops->compat_getsockopt)
 417                         err = sock->ops->compat_getsockopt(sock, level,
 418                                         optname, optval, optlen);
 419                 else
 420                         err = sock->ops->getsockopt(sock, level,
 421                                         optname, optval, optlen);
 422                 sockfd_put(sock);
 423         }
 424         return err;
 425 }
 426
 427 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 428                        char __user *, optval, int __user *, optlen)
 429 {
 430         return __compat_sys_getsockopt(fd, level, optname, optval, optlen);
 431 }
 432
 433 struct compat_group_req {
 434         __u32                            gr_interface;
 435         struct __kernel_sockaddr_storage gr_group
 436                 __aligned(4);
 437 } __packed;
 438
 439 struct compat_group_source_req {
 440         __u32                            gsr_interface;
 441         struct __kernel_sockaddr_storage gsr_group
 442                 __aligned(4);
 443         struct __kernel_sockaddr_storage gsr_source
 444                 __aligned(4);
 445 } __packed;
 446
 447 struct compat_group_filter {
 448         __u32                            gf_interface;
 449         struct __kernel_sockaddr_storage gf_group
 450                 __aligned(4);
 451         __u32                            gf_fmode;
 452         __u32                            gf_numsrc;
 453         struct __kernel_sockaddr_storage gf_slist[1]
 454                 __aligned(4);
 455 } __packed;
 456
 457 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 458                         sizeof(struct __kernel_sockaddr_storage))
 459
 460
 461 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 462         char __user *optval, unsigned int optlen,
 463         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 464 {
 465         char __user     *koptval = optval;
 466         int             koptlen = optlen;
 467
 468         switch (optname) {
 469         case MCAST_JOIN_GROUP:
 470         case MCAST_LEAVE_GROUP:
 471         {
 472                 struct compat_group_req __user *gr32 = (void __user *)optval;
 473                 struct group_req __user *kgr =
 474                         compat_alloc_user_space(sizeof(struct group_req));
 475                 u32 interface;
 476
 477                 if (!access_ok(gr32, sizeof(*gr32)) ||
 478                     !access_ok(kgr, sizeof(struct group_req)) ||
 479                     __get_user(interface, &gr32->gr_interface) ||
 480                     __put_user(interface, &kgr->gr_interface) ||
 481                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 482                                 sizeof(kgr->gr_group)))
 483                         return -EFAULT;
 484                 koptval = (char __user *)kgr;
 485                 koptlen = sizeof(struct group_req);
 486                 break;
 487         }
 488         case MCAST_JOIN_SOURCE_GROUP:
 489         case MCAST_LEAVE_SOURCE_GROUP:
 490         case MCAST_BLOCK_SOURCE:
 491         case MCAST_UNBLOCK_SOURCE:
 492         {
 493                 struct compat_group_source_req __user *gsr32 = (void __user *)optval;
 494                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 495                         sizeof(struct group_source_req));
 496                 u32 interface;
 497
 498                 if (!access_ok(gsr32, sizeof(*gsr32)) ||
 499                     !access_ok(kgsr,
 500                         sizeof(struct group_source_req)) ||
 501                     __get_user(interface, &gsr32->gsr_interface) ||
 502                     __put_user(interface, &kgsr->gsr_interface) ||
 503                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 504                                 sizeof(kgsr->gsr_group)) ||
 505                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 506                                 sizeof(kgsr->gsr_source)))
 507                         return -EFAULT;
 508                 koptval = (char __user *)kgsr;
 509                 koptlen = sizeof(struct group_source_req);
 510                 break;
 511         }
 512         case MCAST_MSFILTER:
 513         {
 514                 struct compat_group_filter __user *gf32 = (void __user *)optval;
 515                 struct group_filter __user *kgf;
 516                 u32 interface, fmode, numsrc;
 517
 518                 if (!access_ok(gf32, __COMPAT_GF0_SIZE) ||
 519                     __get_user(interface, &gf32->gf_interface) ||
 520                     __get_user(fmode, &gf32->gf_fmode) ||
 521                     __get_user(numsrc, &gf32->gf_numsrc))
 522                         return -EFAULT;
 523                 koptlen = optlen + sizeof(struct group_filter) -
 524                                 sizeof(struct compat_group_filter);
 525                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 526                         return -EINVAL;
 527                 kgf = compat_alloc_user_space(koptlen);
 528                 if (!access_ok(kgf, koptlen) ||
 529                     __put_user(interface, &kgf->gf_interface) ||
 530                     __put_user(fmode, &kgf->gf_fmode) ||
 531                     __put_user(numsrc, &kgf->gf_numsrc) ||
 532                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 533                                 sizeof(kgf->gf_group)) ||
 534                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 535                                 numsrc * sizeof(kgf->gf_slist[0]))))
 536                         return -EFAULT;
 537                 koptval = (char __user *)kgf;
 538                 break;
 539         }
 540
 541         default:
 542                 break;
 543         }
 544         return setsockopt(sock, level, optname, koptval, koptlen);
 545 }
 546 EXPORT_SYMBOL(compat_mc_setsockopt);
 547
 548 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 549         char __user *optval, int __user *optlen,
 550         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 551 {
 552         struct compat_group_filter __user *gf32 = (void __user *)optval;
 553         struct group_filter __user *kgf;
 554         int __user      *koptlen;
 555         u32 interface, fmode, numsrc;
 556         int klen, ulen, err;
 557
 558         if (optname != MCAST_MSFILTER)
 559                 return getsockopt(sock, level, optname, optval, optlen);
 560
 561         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 562         if (!access_ok(optlen, sizeof(*optlen)) ||
 563             __get_user(ulen, optlen))
 564                 return -EFAULT;
 565
 566         /* adjust len for pad */
 567         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 568
 569         if (klen < GROUP_FILTER_SIZE(0))
 570                 return -EINVAL;
 571
 572         if (!access_ok(koptlen, sizeof(*koptlen)) ||
 573             __put_user(klen, koptlen))
 574                 return -EFAULT;
 575
 576         /* have to allow space for previous compat_alloc_user_space, too */
 577         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 578
 579         if (!access_ok(gf32, __COMPAT_GF0_SIZE) ||
 580             __get_user(interface, &gf32->gf_interface) ||
 581             __get_user(fmode, &gf32->gf_fmode) ||
 582             __get_user(numsrc, &gf32->gf_numsrc) ||
 583             __put_user(interface, &kgf->gf_interface) ||
 584             __put_user(fmode, &kgf->gf_fmode) ||
 585             __put_user(numsrc, &kgf->gf_numsrc) ||
 586             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 587                 return -EFAULT;
 588
 589         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 590         if (err)
 591                 return err;
 592
 593         if (!access_ok(koptlen, sizeof(*koptlen)) ||
 594             __get_user(klen, koptlen))
 595                 return -EFAULT;
 596
 597         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 598
 599         if (!access_ok(optlen, sizeof(*optlen)) ||
 600             __put_user(ulen, optlen))
 601                 return -EFAULT;
 602
 603         if (!access_ok(kgf, klen) ||
 604             !access_ok(gf32, ulen) ||
 605             __get_user(interface, &kgf->gf_interface) ||
 606             __get_user(fmode, &kgf->gf_fmode) ||
 607             __get_user(numsrc, &kgf->gf_numsrc) ||
 608             __put_user(interface, &gf32->gf_interface) ||
 609             __put_user(fmode, &gf32->gf_fmode) ||
 610             __put_user(numsrc, &gf32->gf_numsrc))
 611                 return -EFAULT;
 612         if (numsrc) {
 613                 int copylen;
 614
 615                 klen -= GROUP_FILTER_SIZE(0);
 616                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 617                 if (copylen > klen)
 618                         copylen = klen;
 619                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 620                         return -EFAULT;
 621         }
 622         return err;
 623 }
 624 EXPORT_SYMBOL(compat_mc_getsockopt);
 625
 626
 627 /* Argument list sizes for compat_sys_socketcall */
 628 #define AL(x) ((x) * sizeof(u32))
 629 static unsigned char nas[21] = {
 630         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 631         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 632         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 633         AL(4), AL(5), AL(4)
 634 };
 635 #undef AL
 636
 637 static inline long __compat_sys_sendmsg(int fd,
 638                                         struct compat_msghdr __user *msg,
 639                                         unsigned int flags)
 640 {
 641         return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
 642                              flags | MSG_CMSG_COMPAT, false);
 643 }
 644
 645 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
 646                        unsigned int, flags)
 647 {
 648         return __compat_sys_sendmsg(fd, msg, flags);
 649 }
 650
 651 static inline long __compat_sys_sendmmsg(int fd,
 652                                          struct compat_mmsghdr __user *mmsg,
 653                                          unsigned int vlen, unsigned int flags)
 654 {
 655         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 656                               flags | MSG_CMSG_COMPAT, false);
 657 }
 658
 659 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 660                        unsigned int, vlen, unsigned int, flags)
 661 {
 662         return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
 663 }
 664
 665 static inline long __compat_sys_recvmsg(int fd,
 666                                         struct compat_msghdr __user *msg,
 667                                         unsigned int flags)
 668 {
 669         return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
 670                              flags | MSG_CMSG_COMPAT, false);
 671 }
 672
 673 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
 674                        unsigned int, flags)
 675 {
 676         return __compat_sys_recvmsg(fd, msg, flags);
 677 }
 678
 679 static inline long __compat_sys_recvfrom(int fd, void __user *buf,
 680                                          compat_size_t len, unsigned int flags,
 681                                          struct sockaddr __user *addr,
 682                                          int __user *addrlen)
 683 {
 684         return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
 685                               addrlen);
 686 }
 687
 688 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 689 {
 690         return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
 691 }
 692
 693 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 694                        unsigned int, flags, struct sockaddr __user *, addr,
 695                        int __user *, addrlen)
 696 {
 697         return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
 698 }
 699
 700 COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg,
 701                        unsigned int, vlen, unsigned int, flags,
 702                        struct __kernel_timespec __user *, timeout)
 703 {
 704         return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 705                               flags | MSG_CMSG_COMPAT, timeout, NULL);
 706 }
 707
 708 #ifdef CONFIG_COMPAT_32BIT_TIME
 709 COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg,
 710                        unsigned int, vlen, unsigned int, flags,
 711                        struct old_timespec32 __user *, timeout)
 712 {
 713         return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 714                               flags | MSG_CMSG_COMPAT, NULL, timeout);
 715 }
 716 #endif
 717
 718 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 719 {
 720         u32 a[AUDITSC_ARGS];
 721         unsigned int len;
 722         u32 a0, a1;
 723         int ret;
 724
 725         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 726                 return -EINVAL;
 727         len = nas[call];
 728         if (len > sizeof(a))
 729                 return -EINVAL;
 730
 731         if (copy_from_user(a, args, len))
 732                 return -EFAULT;
 733
 734         ret = audit_socketcall_compat(len / sizeof(a[0]), a);
 735         if (ret)
 736                 return ret;
 737
 738         a0 = a[0];
 739         a1 = a[1];
 740
 741         switch (call) {
 742         case SYS_SOCKET:
 743                 ret = __sys_socket(a0, a1, a[2]);
 744                 break;
 745         case SYS_BIND:
 746                 ret = __sys_bind(a0, compat_ptr(a1), a[2]);
 747                 break;
 748         case SYS_CONNECT:
 749                 ret = __sys_connect(a0, compat_ptr(a1), a[2]);
 750                 break;
 751         case SYS_LISTEN:
 752                 ret = __sys_listen(a0, a1);
 753                 break;
 754         case SYS_ACCEPT:
 755                 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 756                 break;
 757         case SYS_GETSOCKNAME:
 758                 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 759                 break;
 760         case SYS_GETPEERNAME:
 761                 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 762                 break;
 763         case SYS_SOCKETPAIR:
 764                 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 765                 break;
 766         case SYS_SEND:
 767                 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
 768                 break;
 769         case SYS_SENDTO:
 770                 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
 771                                    compat_ptr(a[4]), a[5]);
 772                 break;
 773         case SYS_RECV:
 774                 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 775                                             NULL, NULL);
 776                 break;
 777         case SYS_RECVFROM:
 778                 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 779                                             compat_ptr(a[4]),
 780                                             compat_ptr(a[5]));
 781                 break;
 782         case SYS_SHUTDOWN:
 783                 ret = __sys_shutdown(a0, a1);
 784                 break;
 785         case SYS_SETSOCKOPT:
 786                 ret = __compat_sys_setsockopt(a0, a1, a[2],
 787                                               compat_ptr(a[3]), a[4]);
 788                 break;
 789         case SYS_GETSOCKOPT:
 790                 ret = __compat_sys_getsockopt(a0, a1, a[2],
 791                                               compat_ptr(a[3]),
 792                                               compat_ptr(a[4]));
 793                 break;
 794         case SYS_SENDMSG:
 795                 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 796                 break;
 797         case SYS_SENDMMSG:
 798                 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 799                 break;
 800         case SYS_RECVMSG:
 801                 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 802                 break;
 803         case SYS_RECVMMSG:
 804                 ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2],
 805                                      a[3] | MSG_CMSG_COMPAT, NULL,
 806                                      compat_ptr(a[4]));
 807                 break;
 808         case SYS_ACCEPT4:
 809                 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 810                 break;
 811         default:
 812                 ret = -EINVAL;
 813                 break;
 814         }
 815         return ret;
 816 }