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                         compat_uptr_t *ptr, compat_size_t *len)
  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         *ptr = msg.msg_iov;
  83         *len = msg.msg_iovlen;
  84         return 0;
  85 }
  86
  87 int get_compat_msghdr(struct msghdr *kmsg,
  88                       struct compat_msghdr __user *umsg,
  89                       struct sockaddr __user **save_addr,
  90                       struct iovec **iov)
  91 {
  92         compat_uptr_t ptr;
  93         compat_size_t len;
  94         ssize_t err;
  95
  96         err = __get_compat_msghdr(kmsg, umsg, save_addr, &ptr, &len);
  97         if (err)
  98                 return err;
  99
 100         err = compat_import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr),
 101                                    len, UIO_FASTIOV, iov, &kmsg->msg_iter);
 102         return err < 0 ? err : 0;
 103 }
 104
 105 /* Bleech... */
 106 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 107
 108 #define CMSG_COMPAT_DATA(cmsg)                          \
 109         ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
 110 #define CMSG_COMPAT_SPACE(len)                          \
 111         (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
 112 #define CMSG_COMPAT_LEN(len)                            \
 113         (sizeof(struct compat_cmsghdr) + (len))
 114
 115 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 116         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 117          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 118          (struct compat_cmsghdr __user *)NULL)
 119
 120 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 121         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 122          (ucmlen) <= (unsigned long) \
 123          ((mhdr)->msg_controllen - \
 124           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 125
 126 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 127                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 128 {
 129         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 130         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 131                         msg->msg_controllen)
 132                 return NULL;
 133         return (struct compat_cmsghdr __user *)ptr;
 134 }
 135
 136 /* There is a lot of hair here because the alignment rules (and
 137  * thus placement) of cmsg headers and length are different for
 138  * 32-bit apps.  -DaveM
 139  */
 140 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 141                                unsigned char *stackbuf, int stackbuf_size)
 142 {
 143         struct compat_cmsghdr __user *ucmsg;
 144         struct cmsghdr *kcmsg, *kcmsg_base;
 145         compat_size_t ucmlen;
 146         __kernel_size_t kcmlen, tmp;
 147         int err = -EFAULT;
 148
 149         BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
 150                      CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
 151
 152         kcmlen = 0;
 153         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 154         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 155         while (ucmsg != NULL) {
 156                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 157                         return -EFAULT;
 158
 159                 /* Catch bogons. */
 160                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 161                         return -EINVAL;
 162
 163                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 164                 tmp = CMSG_ALIGN(tmp);
 165                 kcmlen += tmp;
 166                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 167         }
 168         if (kcmlen == 0)
 169                 return -EINVAL;
 170
 171         /* The kcmlen holds the 64-bit version of the control length.
 172          * It may not be modified as we do not stick it into the kmsg
 173          * until we have successfully copied over all of the data
 174          * from the user.
 175          */
 176         if (kcmlen > stackbuf_size)
 177                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 178         if (kcmsg == NULL)
 179                 return -ENOBUFS;
 180
 181         /* Now copy them over neatly. */
 182         memset(kcmsg, 0, kcmlen);
 183         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 184         while (ucmsg != NULL) {
 185                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 186                         goto Efault;
 187                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 188                         goto Einval;
 189                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 190                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 191                         goto Einval;
 192                 kcmsg->cmsg_len = tmp;
 193                 tmp = CMSG_ALIGN(tmp);
 194                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 195                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 196                     copy_from_user(CMSG_DATA(kcmsg),
 197                                    CMSG_COMPAT_DATA(ucmsg),
 198                                    (ucmlen - sizeof(*ucmsg))))
 199                         goto Efault;
 200
 201                 /* Advance. */
 202                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 203                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 204         }
 205
 206         /*
 207          * check the length of messages copied in is the same as the
 208          * what we get from the first loop
 209          */
 210         if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
 211                 goto Einval;
 212
 213         /* Ok, looks like we made it.  Hook it up and return success. */
 214         kmsg->msg_control = kcmsg_base;
 215         kmsg->msg_controllen = kcmlen;
 216         return 0;
 217
 218 Einval:
 219         err = -EINVAL;
 220 Efault:
 221         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 222                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 223         return err;
 224 }
 225
 226 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 227 {
 228         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 229         struct compat_cmsghdr cmhdr;
 230         struct old_timeval32 ctv;
 231         struct old_timespec32 cts[3];
 232         int cmlen;
 233
 234         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 235                 kmsg->msg_flags |= MSG_CTRUNC;
 236                 return 0; /* XXX: return error? check spec. */
 237         }
 238
 239         if (!COMPAT_USE_64BIT_TIME) {
 240                 if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) {
 241                         struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data;
 242                         ctv.tv_sec = tv->tv_sec;
 243                         ctv.tv_usec = tv->tv_usec;
 244                         data = &ctv;
 245                         len = sizeof(ctv);
 246                 }
 247                 if (level == SOL_SOCKET &&
 248                     (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) {
 249                         int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3;
 250                         int i;
 251                         struct __kernel_old_timespec *ts = data;
 252                         for (i = 0; i < count; i++) {
 253                                 cts[i].tv_sec = ts[i].tv_sec;
 254                                 cts[i].tv_nsec = ts[i].tv_nsec;
 255                         }
 256                         data = &cts;
 257                         len = sizeof(cts[0]) * count;
 258                 }
 259         }
 260
 261         cmlen = CMSG_COMPAT_LEN(len);
 262         if (kmsg->msg_controllen < cmlen) {
 263                 kmsg->msg_flags |= MSG_CTRUNC;
 264                 cmlen = kmsg->msg_controllen;
 265         }
 266         cmhdr.cmsg_level = level;
 267         cmhdr.cmsg_type = type;
 268         cmhdr.cmsg_len = cmlen;
 269
 270         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 271                 return -EFAULT;
 272         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 273                 return -EFAULT;
 274         cmlen = CMSG_COMPAT_SPACE(len);
 275         if (kmsg->msg_controllen < cmlen)
 276                 cmlen = kmsg->msg_controllen;
 277         kmsg->msg_control += cmlen;
 278         kmsg->msg_controllen -= cmlen;
 279         return 0;
 280 }
 281
 282 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 283 {
 284         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 285         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 286         int fdnum = scm->fp->count;
 287         struct file **fp = scm->fp->fp;
 288         int __user *cmfptr;
 289         int err = 0, i;
 290
 291         if (fdnum < fdmax)
 292                 fdmax = fdnum;
 293
 294         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 295                 int new_fd;
 296                 err = security_file_receive(fp[i]);
 297                 if (err)
 298                         break;
 299                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 300                                           ? O_CLOEXEC : 0);
 301                 if (err < 0)
 302                         break;
 303                 new_fd = err;
 304                 err = put_user(new_fd, cmfptr);
 305                 if (err) {
 306                         put_unused_fd(new_fd);
 307                         break;
 308                 }
 309                 /* Bump the usage count and install the file. */
 310                 fd_install(new_fd, get_file(fp[i]));
 311         }
 312
 313         if (i > 0) {
 314                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 315                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 316                 if (!err)
 317                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 318                 if (!err)
 319                         err = put_user(cmlen, &cm->cmsg_len);
 320                 if (!err) {
 321                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 322                         kmsg->msg_control += cmlen;
 323                         kmsg->msg_controllen -= cmlen;
 324                 }
 325         }
 326         if (i < fdnum)
 327                 kmsg->msg_flags |= MSG_CTRUNC;
 328
 329         /*
 330          * All of the files that fit in the message have had their
 331          * usage counts incremented, so we just free the list.
 332          */
 333         __scm_destroy(scm);
 334 }
 335
 336 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
 337 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
 338 {
 339         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 340         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 341         struct compat_sock_fprog f32;
 342         struct sock_fprog f;
 343
 344         if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
 345                 return NULL;
 346         memset(&f, 0, sizeof(f));
 347         f.len = f32.len;
 348         f.filter = compat_ptr(f32.filter);
 349         if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
 350                 return NULL;
 351
 352         return kfprog;
 353 }
 354 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
 355
 356 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 357                                 char __user *optval, unsigned int optlen)
 358 {
 359         struct sock_fprog __user *kfprog;
 360
 361         kfprog = get_compat_bpf_fprog(optval);
 362         if (!kfprog)
 363                 return -EFAULT;
 364
 365         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 366                               sizeof(struct sock_fprog));
 367 }
 368
 369 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 370                                 char __user *optval, unsigned int optlen)
 371 {
 372         if (optname == SO_ATTACH_FILTER ||
 373             optname == SO_ATTACH_REUSEPORT_CBPF)
 374                 return do_set_attach_filter(sock, level, optname,
 375                                             optval, optlen);
 376         return sock_setsockopt(sock, level, optname, optval, optlen);
 377 }
 378
 379 static int __compat_sys_setsockopt(int fd, int level, int optname,
 380                                    char __user *optval, unsigned int optlen)
 381 {
 382         int err;
 383         struct socket *sock;
 384
 385         if (optlen > INT_MAX)
 386                 return -EINVAL;
 387
 388         sock = sockfd_lookup(fd, &err);
 389         if (sock) {
 390                 err = security_socket_setsockopt(sock, level, optname);
 391                 if (err) {
 392                         sockfd_put(sock);
 393                         return err;
 394                 }
 395
 396                 if (level == SOL_SOCKET)
 397                         err = compat_sock_setsockopt(sock, level,
 398                                         optname, optval, optlen);
 399                 else if (sock->ops->compat_setsockopt)
 400                         err = sock->ops->compat_setsockopt(sock, level,
 401                                         optname, optval, optlen);
 402                 else
 403                         err = sock->ops->setsockopt(sock, level,
 404                                         optname, optval, optlen);
 405                 sockfd_put(sock);
 406         }
 407         return err;
 408 }
 409
 410 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 411                        char __user *, optval, unsigned int, optlen)
 412 {
 413         return __compat_sys_setsockopt(fd, level, optname, optval, optlen);
 414 }
 415
 416 static int __compat_sys_getsockopt(int fd, int level, int optname,
 417                                    char __user *optval,
 418                                    int __user *optlen)
 419 {
 420         int err;
 421         struct socket *sock = sockfd_lookup(fd, &err);
 422
 423         if (sock) {
 424                 err = security_socket_getsockopt(sock, level, optname);
 425                 if (err) {
 426                         sockfd_put(sock);
 427                         return err;
 428                 }
 429
 430                 if (level == SOL_SOCKET)
 431                         err = sock_getsockopt(sock, level,
 432                                         optname, optval, optlen);
 433                 else if (sock->ops->compat_getsockopt)
 434                         err = sock->ops->compat_getsockopt(sock, level,
 435                                         optname, optval, optlen);
 436                 else
 437                         err = sock->ops->getsockopt(sock, level,
 438                                         optname, optval, optlen);
 439                 sockfd_put(sock);
 440         }
 441         return err;
 442 }
 443
 444 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 445                        char __user *, optval, int __user *, optlen)
 446 {
 447         return __compat_sys_getsockopt(fd, level, optname, optval, optlen);
 448 }
 449
 450 struct compat_group_req {
 451         __u32                            gr_interface;
 452         struct __kernel_sockaddr_storage gr_group
 453                 __aligned(4);
 454 } __packed;
 455
 456 struct compat_group_source_req {
 457         __u32                            gsr_interface;
 458         struct __kernel_sockaddr_storage gsr_group
 459                 __aligned(4);
 460         struct __kernel_sockaddr_storage gsr_source
 461                 __aligned(4);
 462 } __packed;
 463
 464 struct compat_group_filter {
 465         __u32                            gf_interface;
 466         struct __kernel_sockaddr_storage gf_group
 467                 __aligned(4);
 468         __u32                            gf_fmode;
 469         __u32                            gf_numsrc;
 470         struct __kernel_sockaddr_storage gf_slist[1]
 471                 __aligned(4);
 472 } __packed;
 473
 474 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 475                         sizeof(struct __kernel_sockaddr_storage))
 476
 477
 478 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 479         char __user *optval, unsigned int optlen,
 480         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 481 {
 482         char __user     *koptval = optval;
 483         int             koptlen = optlen;
 484
 485         switch (optname) {
 486         case MCAST_JOIN_GROUP:
 487         case MCAST_LEAVE_GROUP:
 488         {
 489                 struct compat_group_req __user *gr32 = (void __user *)optval;
 490                 struct group_req __user *kgr =
 491                         compat_alloc_user_space(sizeof(struct group_req));
 492                 u32 interface;
 493
 494                 if (!access_ok(gr32, sizeof(*gr32)) ||
 495                     !access_ok(kgr, sizeof(struct group_req)) ||
 496                     __get_user(interface, &gr32->gr_interface) ||
 497                     __put_user(interface, &kgr->gr_interface) ||
 498                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 499                                 sizeof(kgr->gr_group)))
 500                         return -EFAULT;
 501                 koptval = (char __user *)kgr;
 502                 koptlen = sizeof(struct group_req);
 503                 break;
 504         }
 505         case MCAST_JOIN_SOURCE_GROUP:
 506         case MCAST_LEAVE_SOURCE_GROUP:
 507         case MCAST_BLOCK_SOURCE:
 508         case MCAST_UNBLOCK_SOURCE:
 509         {
 510                 struct compat_group_source_req __user *gsr32 = (void __user *)optval;
 511                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 512                         sizeof(struct group_source_req));
 513                 u32 interface;
 514
 515                 if (!access_ok(gsr32, sizeof(*gsr32)) ||
 516                     !access_ok(kgsr,
 517                         sizeof(struct group_source_req)) ||
 518                     __get_user(interface, &gsr32->gsr_interface) ||
 519                     __put_user(interface, &kgsr->gsr_interface) ||
 520                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 521                                 sizeof(kgsr->gsr_group)) ||
 522                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 523                                 sizeof(kgsr->gsr_source)))
 524                         return -EFAULT;
 525                 koptval = (char __user *)kgsr;
 526                 koptlen = sizeof(struct group_source_req);
 527                 break;
 528         }
 529         case MCAST_MSFILTER:
 530         {
 531                 struct compat_group_filter __user *gf32 = (void __user *)optval;
 532                 struct group_filter __user *kgf;
 533                 u32 interface, fmode, numsrc;
 534
 535                 if (!access_ok(gf32, __COMPAT_GF0_SIZE) ||
 536                     __get_user(interface, &gf32->gf_interface) ||
 537                     __get_user(fmode, &gf32->gf_fmode) ||
 538                     __get_user(numsrc, &gf32->gf_numsrc))
 539                         return -EFAULT;
 540                 koptlen = optlen + sizeof(struct group_filter) -
 541                                 sizeof(struct compat_group_filter);
 542                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 543                         return -EINVAL;
 544                 kgf = compat_alloc_user_space(koptlen);
 545                 if (!access_ok(kgf, koptlen) ||
 546                     __put_user(interface, &kgf->gf_interface) ||
 547                     __put_user(fmode, &kgf->gf_fmode) ||
 548                     __put_user(numsrc, &kgf->gf_numsrc) ||
 549                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 550                                 sizeof(kgf->gf_group)) ||
 551                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 552                                 numsrc * sizeof(kgf->gf_slist[0]))))
 553                         return -EFAULT;
 554                 koptval = (char __user *)kgf;
 555                 break;
 556         }
 557
 558         default:
 559                 break;
 560         }
 561         return setsockopt(sock, level, optname, koptval, koptlen);
 562 }
 563 EXPORT_SYMBOL(compat_mc_setsockopt);
 564
 565 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 566         char __user *optval, int __user *optlen,
 567         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 568 {
 569         struct compat_group_filter __user *gf32 = (void __user *)optval;
 570         struct group_filter __user *kgf;
 571         int __user      *koptlen;
 572         u32 interface, fmode, numsrc;
 573         int klen, ulen, err;
 574
 575         if (optname != MCAST_MSFILTER)
 576                 return getsockopt(sock, level, optname, optval, optlen);
 577
 578         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 579         if (!access_ok(optlen, sizeof(*optlen)) ||
 580             __get_user(ulen, optlen))
 581                 return -EFAULT;
 582
 583         /* adjust len for pad */
 584         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 585
 586         if (klen < GROUP_FILTER_SIZE(0))
 587                 return -EINVAL;
 588
 589         if (!access_ok(koptlen, sizeof(*koptlen)) ||
 590             __put_user(klen, koptlen))
 591                 return -EFAULT;
 592
 593         /* have to allow space for previous compat_alloc_user_space, too */
 594         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 595
 596         if (!access_ok(gf32, __COMPAT_GF0_SIZE) ||
 597             __get_user(interface, &gf32->gf_interface) ||
 598             __get_user(fmode, &gf32->gf_fmode) ||
 599             __get_user(numsrc, &gf32->gf_numsrc) ||
 600             __put_user(interface, &kgf->gf_interface) ||
 601             __put_user(fmode, &kgf->gf_fmode) ||
 602             __put_user(numsrc, &kgf->gf_numsrc) ||
 603             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 604                 return -EFAULT;
 605
 606         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 607         if (err)
 608                 return err;
 609
 610         if (!access_ok(koptlen, sizeof(*koptlen)) ||
 611             __get_user(klen, koptlen))
 612                 return -EFAULT;
 613
 614         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 615
 616         if (!access_ok(optlen, sizeof(*optlen)) ||
 617             __put_user(ulen, optlen))
 618                 return -EFAULT;
 619
 620         if (!access_ok(kgf, klen) ||
 621             !access_ok(gf32, ulen) ||
 622             __get_user(interface, &kgf->gf_interface) ||
 623             __get_user(fmode, &kgf->gf_fmode) ||
 624             __get_user(numsrc, &kgf->gf_numsrc) ||
 625             __put_user(interface, &gf32->gf_interface) ||
 626             __put_user(fmode, &gf32->gf_fmode) ||
 627             __put_user(numsrc, &gf32->gf_numsrc))
 628                 return -EFAULT;
 629         if (numsrc) {
 630                 int copylen;
 631
 632                 klen -= GROUP_FILTER_SIZE(0);
 633                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 634                 if (copylen > klen)
 635                         copylen = klen;
 636                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 637                         return -EFAULT;
 638         }
 639         return err;
 640 }
 641 EXPORT_SYMBOL(compat_mc_getsockopt);
 642
 643
 644 /* Argument list sizes for compat_sys_socketcall */
 645 #define AL(x) ((x) * sizeof(u32))
 646 static unsigned char nas[21] = {
 647         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 648         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 649         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 650         AL(4), AL(5), AL(4)
 651 };
 652 #undef AL
 653
 654 static inline long __compat_sys_sendmsg(int fd,
 655                                         struct compat_msghdr __user *msg,
 656                                         unsigned int flags)
 657 {
 658         return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
 659                              flags | MSG_CMSG_COMPAT, false);
 660 }
 661
 662 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
 663                        unsigned int, flags)
 664 {
 665         return __compat_sys_sendmsg(fd, msg, flags);
 666 }
 667
 668 static inline long __compat_sys_sendmmsg(int fd,
 669                                          struct compat_mmsghdr __user *mmsg,
 670                                          unsigned int vlen, unsigned int flags)
 671 {
 672         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 673                               flags | MSG_CMSG_COMPAT, false);
 674 }
 675
 676 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 677                        unsigned int, vlen, unsigned int, flags)
 678 {
 679         return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
 680 }
 681
 682 static inline long __compat_sys_recvmsg(int fd,
 683                                         struct compat_msghdr __user *msg,
 684                                         unsigned int flags)
 685 {
 686         return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
 687                              flags | MSG_CMSG_COMPAT, false);
 688 }
 689
 690 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
 691                        unsigned int, flags)
 692 {
 693         return __compat_sys_recvmsg(fd, msg, flags);
 694 }
 695
 696 static inline long __compat_sys_recvfrom(int fd, void __user *buf,
 697                                          compat_size_t len, unsigned int flags,
 698                                          struct sockaddr __user *addr,
 699                                          int __user *addrlen)
 700 {
 701         return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
 702                               addrlen);
 703 }
 704
 705 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 706 {
 707         return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
 708 }
 709
 710 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 711                        unsigned int, flags, struct sockaddr __user *, addr,
 712                        int __user *, addrlen)
 713 {
 714         return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
 715 }
 716
 717 COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg,
 718                        unsigned int, vlen, unsigned int, flags,
 719                        struct __kernel_timespec __user *, timeout)
 720 {
 721         return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 722                               flags | MSG_CMSG_COMPAT, timeout, NULL);
 723 }
 724
 725 #ifdef CONFIG_COMPAT_32BIT_TIME
 726 COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg,
 727                        unsigned int, vlen, unsigned int, flags,
 728                        struct old_timespec32 __user *, timeout)
 729 {
 730         return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 731                               flags | MSG_CMSG_COMPAT, NULL, timeout);
 732 }
 733 #endif
 734
 735 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 736 {
 737         u32 a[AUDITSC_ARGS];
 738         unsigned int len;
 739         u32 a0, a1;
 740         int ret;
 741
 742         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 743                 return -EINVAL;
 744         len = nas[call];
 745         if (len > sizeof(a))
 746                 return -EINVAL;
 747
 748         if (copy_from_user(a, args, len))
 749                 return -EFAULT;
 750
 751         ret = audit_socketcall_compat(len / sizeof(a[0]), a);
 752         if (ret)
 753                 return ret;
 754
 755         a0 = a[0];
 756         a1 = a[1];
 757
 758         switch (call) {
 759         case SYS_SOCKET:
 760                 ret = __sys_socket(a0, a1, a[2]);
 761                 break;
 762         case SYS_BIND:
 763                 ret = __sys_bind(a0, compat_ptr(a1), a[2]);
 764                 break;
 765         case SYS_CONNECT:
 766                 ret = __sys_connect(a0, compat_ptr(a1), a[2]);
 767                 break;
 768         case SYS_LISTEN:
 769                 ret = __sys_listen(a0, a1);
 770                 break;
 771         case SYS_ACCEPT:
 772                 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 773                 break;
 774         case SYS_GETSOCKNAME:
 775                 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 776                 break;
 777         case SYS_GETPEERNAME:
 778                 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 779                 break;
 780         case SYS_SOCKETPAIR:
 781                 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 782                 break;
 783         case SYS_SEND:
 784                 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
 785                 break;
 786         case SYS_SENDTO:
 787                 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
 788                                    compat_ptr(a[4]), a[5]);
 789                 break;
 790         case SYS_RECV:
 791                 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 792                                             NULL, NULL);
 793                 break;
 794         case SYS_RECVFROM:
 795                 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 796                                             compat_ptr(a[4]),
 797                                             compat_ptr(a[5]));
 798                 break;
 799         case SYS_SHUTDOWN:
 800                 ret = __sys_shutdown(a0, a1);
 801                 break;
 802         case SYS_SETSOCKOPT:
 803                 ret = __compat_sys_setsockopt(a0, a1, a[2],
 804                                               compat_ptr(a[3]), a[4]);
 805                 break;
 806         case SYS_GETSOCKOPT:
 807                 ret = __compat_sys_getsockopt(a0, a1, a[2],
 808                                               compat_ptr(a[3]),
 809                                               compat_ptr(a[4]));
 810                 break;
 811         case SYS_SENDMSG:
 812                 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 813                 break;
 814         case SYS_SENDMMSG:
 815                 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 816                 break;
 817         case SYS_RECVMSG:
 818                 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 819                 break;
 820         case SYS_RECVMMSG:
 821                 ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2],
 822                                      a[3] | MSG_CMSG_COMPAT, NULL,
 823                                      compat_ptr(a[4]));
 824                 break;
 825         case SYS_ACCEPT4:
 826                 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 827                 break;
 828         default:
 829                 ret = -EINVAL;
 830                 break;
 831         }
 832         return ret;
 833 }