linux/net/compat.c
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   1/*
   2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   3 *
   4 * Copyright (C) 2000           VA Linux Co
   5 * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   6 * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7 * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8 * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   9 * Copyright (C) 2000           Hewlett-Packard Co.
  10 * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11 * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/gfp.h>
  16#include <linux/fs.h>
  17#include <linux/types.h>
  18#include <linux/file.h>
  19#include <linux/icmpv6.h>
  20#include <linux/socket.h>
  21#include <linux/syscalls.h>
  22#include <linux/filter.h>
  23#include <linux/compat.h>
  24#include <linux/security.h>
  25#include <linux/audit.h>
  26#include <linux/export.h>
  27
  28#include <net/scm.h>
  29#include <net/sock.h>
  30#include <net/ip.h>
  31#include <net/ipv6.h>
  32#include <linux/uaccess.h>
  33#include <net/compat.h>
  34
  35int get_compat_msghdr(struct msghdr *kmsg,
  36                      struct compat_msghdr __user *umsg,
  37                      struct sockaddr __user **save_addr,
  38                      struct iovec **iov)
  39{
  40        struct compat_msghdr msg;
  41        ssize_t err;
  42
  43        if (copy_from_user(&msg, umsg, sizeof(*umsg)))
  44                return -EFAULT;
  45
  46        kmsg->msg_flags = msg.msg_flags;
  47        kmsg->msg_namelen = msg.msg_namelen;
  48
  49        if (!msg.msg_name)
  50                kmsg->msg_namelen = 0;
  51
  52        if (kmsg->msg_namelen < 0)
  53                return -EINVAL;
  54
  55        if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  56                kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  57
  58        kmsg->msg_control = compat_ptr(msg.msg_control);
  59        kmsg->msg_controllen = msg.msg_controllen;
  60
  61        if (save_addr)
  62                *save_addr = compat_ptr(msg.msg_name);
  63
  64        if (msg.msg_name && kmsg->msg_namelen) {
  65                if (!save_addr) {
  66                        err = move_addr_to_kernel(compat_ptr(msg.msg_name),
  67                                                  kmsg->msg_namelen,
  68                                                  kmsg->msg_name);
  69                        if (err < 0)
  70                                return err;
  71                }
  72        } else {
  73                kmsg->msg_name = NULL;
  74                kmsg->msg_namelen = 0;
  75        }
  76
  77        if (msg.msg_iovlen > UIO_MAXIOV)
  78                return -EMSGSIZE;
  79
  80        kmsg->msg_iocb = NULL;
  81
  82        return compat_import_iovec(save_addr ? READ : WRITE,
  83                                   compat_ptr(msg.msg_iov), msg.msg_iovlen,
  84                                   UIO_FASTIOV, iov, &kmsg->msg_iter);
  85}
  86
  87/* Bleech... */
  88#define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
  89
  90#define CMSG_COMPAT_DATA(cmsg)                          \
  91        ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
  92#define CMSG_COMPAT_SPACE(len)                          \
  93        (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
  94#define CMSG_COMPAT_LEN(len)                            \
  95        (sizeof(struct compat_cmsghdr) + (len))
  96
  97#define CMSG_COMPAT_FIRSTHDR(msg)                       \
  98        (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
  99         (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 100         (struct compat_cmsghdr __user *)NULL)
 101
 102#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 103        ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 104         (ucmlen) <= (unsigned long) \
 105         ((mhdr)->msg_controllen - \
 106          ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 107
 108static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 109                struct compat_cmsghdr __user *cmsg, int cmsg_len)
 110{
 111        char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 112        if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 113                        msg->msg_controllen)
 114                return NULL;
 115        return (struct compat_cmsghdr __user *)ptr;
 116}
 117
 118/* There is a lot of hair here because the alignment rules (and
 119 * thus placement) of cmsg headers and length are different for
 120 * 32-bit apps.  -DaveM
 121 */
 122int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 123                               unsigned char *stackbuf, int stackbuf_size)
 124{
 125        struct compat_cmsghdr __user *ucmsg;
 126        struct cmsghdr *kcmsg, *kcmsg_base;
 127        compat_size_t ucmlen;
 128        __kernel_size_t kcmlen, tmp;
 129        int err = -EFAULT;
 130
 131        BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
 132                     CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
 133
 134        kcmlen = 0;
 135        kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 136        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 137        while (ucmsg != NULL) {
 138                if (get_user(ucmlen, &ucmsg->cmsg_len))
 139                        return -EFAULT;
 140
 141                /* Catch bogons. */
 142                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 143                        return -EINVAL;
 144
 145                tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 146                tmp = CMSG_ALIGN(tmp);
 147                kcmlen += tmp;
 148                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 149        }
 150        if (kcmlen == 0)
 151                return -EINVAL;
 152
 153        /* The kcmlen holds the 64-bit version of the control length.
 154         * It may not be modified as we do not stick it into the kmsg
 155         * until we have successfully copied over all of the data
 156         * from the user.
 157         */
 158        if (kcmlen > stackbuf_size)
 159                kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 160        if (kcmsg == NULL)
 161                return -ENOBUFS;
 162
 163        /* Now copy them over neatly. */
 164        memset(kcmsg, 0, kcmlen);
 165        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 166        while (ucmsg != NULL) {
 167                if (__get_user(ucmlen, &ucmsg->cmsg_len))
 168                        goto Efault;
 169                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 170                        goto Einval;
 171                tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 172                if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 173                        goto Einval;
 174                kcmsg->cmsg_len = tmp;
 175                tmp = CMSG_ALIGN(tmp);
 176                if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 177                    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 178                    copy_from_user(CMSG_DATA(kcmsg),
 179                                   CMSG_COMPAT_DATA(ucmsg),
 180                                   (ucmlen - sizeof(*ucmsg))))
 181                        goto Efault;
 182
 183                /* Advance. */
 184                kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 185                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 186        }
 187
 188        /*
 189         * check the length of messages copied in is the same as the
 190         * what we get from the first loop
 191         */
 192        if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
 193                goto Einval;
 194
 195        /* Ok, looks like we made it.  Hook it up and return success. */
 196        kmsg->msg_control = kcmsg_base;
 197        kmsg->msg_controllen = kcmlen;
 198        return 0;
 199
 200Einval:
 201        err = -EINVAL;
 202Efault:
 203        if (kcmsg_base != (struct cmsghdr *)stackbuf)
 204                sock_kfree_s(sk, kcmsg_base, kcmlen);
 205        return err;
 206}
 207
 208int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 209{
 210        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 211        struct compat_cmsghdr cmhdr;
 212        struct compat_timeval ctv;
 213        struct compat_timespec cts[3];
 214        int cmlen;
 215
 216        if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 217                kmsg->msg_flags |= MSG_CTRUNC;
 218                return 0; /* XXX: return error? check spec. */
 219        }
 220
 221        if (!COMPAT_USE_64BIT_TIME) {
 222                if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 223                        struct timeval *tv = (struct timeval *)data;
 224                        ctv.tv_sec = tv->tv_sec;
 225                        ctv.tv_usec = tv->tv_usec;
 226                        data = &ctv;
 227                        len = sizeof(ctv);
 228                }
 229                if (level == SOL_SOCKET &&
 230                    (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 231                        int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 232                        int i;
 233                        struct timespec *ts = (struct timespec *)data;
 234                        for (i = 0; i < count; i++) {
 235                                cts[i].tv_sec = ts[i].tv_sec;
 236                                cts[i].tv_nsec = ts[i].tv_nsec;
 237                        }
 238                        data = &cts;
 239                        len = sizeof(cts[0]) * count;
 240                }
 241        }
 242
 243        cmlen = CMSG_COMPAT_LEN(len);
 244        if (kmsg->msg_controllen < cmlen) {
 245                kmsg->msg_flags |= MSG_CTRUNC;
 246                cmlen = kmsg->msg_controllen;
 247        }
 248        cmhdr.cmsg_level = level;
 249        cmhdr.cmsg_type = type;
 250        cmhdr.cmsg_len = cmlen;
 251
 252        if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 253                return -EFAULT;
 254        if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 255                return -EFAULT;
 256        cmlen = CMSG_COMPAT_SPACE(len);
 257        if (kmsg->msg_controllen < cmlen)
 258                cmlen = kmsg->msg_controllen;
 259        kmsg->msg_control += cmlen;
 260        kmsg->msg_controllen -= cmlen;
 261        return 0;
 262}
 263
 264void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 265{
 266        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 267        int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 268        int fdnum = scm->fp->count;
 269        struct file **fp = scm->fp->fp;
 270        int __user *cmfptr;
 271        int err = 0, i;
 272
 273        if (fdnum < fdmax)
 274                fdmax = fdnum;
 275
 276        for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 277                int new_fd;
 278                err = security_file_receive(fp[i]);
 279                if (err)
 280                        break;
 281                err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 282                                          ? O_CLOEXEC : 0);
 283                if (err < 0)
 284                        break;
 285                new_fd = err;
 286                err = put_user(new_fd, cmfptr);
 287                if (err) {
 288                        put_unused_fd(new_fd);
 289                        break;
 290                }
 291                /* Bump the usage count and install the file. */
 292                fd_install(new_fd, get_file(fp[i]));
 293        }
 294
 295        if (i > 0) {
 296                int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 297                err = put_user(SOL_SOCKET, &cm->cmsg_level);
 298                if (!err)
 299                        err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 300                if (!err)
 301                        err = put_user(cmlen, &cm->cmsg_len);
 302                if (!err) {
 303                        cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 304                        kmsg->msg_control += cmlen;
 305                        kmsg->msg_controllen -= cmlen;
 306                }
 307        }
 308        if (i < fdnum)
 309                kmsg->msg_flags |= MSG_CTRUNC;
 310
 311        /*
 312         * All of the files that fit in the message have had their
 313         * usage counts incremented, so we just free the list.
 314         */
 315        __scm_destroy(scm);
 316}
 317
 318/* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
 319struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
 320{
 321        struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 322        struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 323        struct compat_sock_fprog f32;
 324        struct sock_fprog f;
 325
 326        if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
 327                return NULL;
 328        memset(&f, 0, sizeof(f));
 329        f.len = f32.len;
 330        f.filter = compat_ptr(f32.filter);
 331        if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
 332                return NULL;
 333
 334        return kfprog;
 335}
 336EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
 337
 338static int do_set_attach_filter(struct socket *sock, int level, int optname,
 339                                char __user *optval, unsigned int optlen)
 340{
 341        struct sock_fprog __user *kfprog;
 342
 343        kfprog = get_compat_bpf_fprog(optval);
 344        if (!kfprog)
 345                return -EFAULT;
 346
 347        return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 348                              sizeof(struct sock_fprog));
 349}
 350
 351static int do_set_sock_timeout(struct socket *sock, int level,
 352                int optname, char __user *optval, unsigned int optlen)
 353{
 354        struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 355        struct timeval ktime;
 356        mm_segment_t old_fs;
 357        int err;
 358
 359        if (optlen < sizeof(*up))
 360                return -EINVAL;
 361        if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 362            __get_user(ktime.tv_sec, &up->tv_sec) ||
 363            __get_user(ktime.tv_usec, &up->tv_usec))
 364                return -EFAULT;
 365        old_fs = get_fs();
 366        set_fs(KERNEL_DS);
 367        err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 368        set_fs(old_fs);
 369
 370        return err;
 371}
 372
 373static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 374                                char __user *optval, unsigned int optlen)
 375{
 376        if (optname == SO_ATTACH_FILTER ||
 377            optname == SO_ATTACH_REUSEPORT_CBPF)
 378                return do_set_attach_filter(sock, level, optname,
 379                                            optval, optlen);
 380        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 381                return do_set_sock_timeout(sock, level, optname, optval, optlen);
 382
 383        return sock_setsockopt(sock, level, optname, optval, optlen);
 384}
 385
 386COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 387                       char __user *, optval, unsigned int, optlen)
 388{
 389        int err;
 390        struct socket *sock = sockfd_lookup(fd, &err);
 391
 392        if (sock) {
 393                err = security_socket_setsockopt(sock, level, optname);
 394                if (err) {
 395                        sockfd_put(sock);
 396                        return err;
 397                }
 398
 399                if (level == SOL_SOCKET)
 400                        err = compat_sock_setsockopt(sock, level,
 401                                        optname, optval, optlen);
 402                else if (sock->ops->compat_setsockopt)
 403                        err = sock->ops->compat_setsockopt(sock, level,
 404                                        optname, optval, optlen);
 405                else
 406                        err = sock->ops->setsockopt(sock, level,
 407                                        optname, optval, optlen);
 408                sockfd_put(sock);
 409        }
 410        return err;
 411}
 412
 413static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 414                char __user *optval, int __user *optlen)
 415{
 416        struct compat_timeval __user *up;
 417        struct timeval ktime;
 418        mm_segment_t old_fs;
 419        int len, err;
 420
 421        up = (struct compat_timeval __user *) optval;
 422        if (get_user(len, optlen))
 423                return -EFAULT;
 424        if (len < sizeof(*up))
 425                return -EINVAL;
 426        len = sizeof(ktime);
 427        old_fs = get_fs();
 428        set_fs(KERNEL_DS);
 429        err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 430        set_fs(old_fs);
 431
 432        if (!err) {
 433                if (put_user(sizeof(*up), optlen) ||
 434                    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 435                    __put_user(ktime.tv_sec, &up->tv_sec) ||
 436                    __put_user(ktime.tv_usec, &up->tv_usec))
 437                        err = -EFAULT;
 438        }
 439        return err;
 440}
 441
 442static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 443                                char __user *optval, int __user *optlen)
 444{
 445        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 446                return do_get_sock_timeout(sock, level, optname, optval, optlen);
 447        return sock_getsockopt(sock, level, optname, optval, optlen);
 448}
 449
 450int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 451{
 452        struct compat_timeval __user *ctv;
 453        int err;
 454        struct timeval tv;
 455
 456        if (COMPAT_USE_64BIT_TIME)
 457                return sock_get_timestamp(sk, userstamp);
 458
 459        ctv = (struct compat_timeval __user *) userstamp;
 460        err = -ENOENT;
 461        if (!sock_flag(sk, SOCK_TIMESTAMP))
 462                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 463        tv = ktime_to_timeval(sk->sk_stamp);
 464        if (tv.tv_sec == -1)
 465                return err;
 466        if (tv.tv_sec == 0) {
 467                sk->sk_stamp = ktime_get_real();
 468                tv = ktime_to_timeval(sk->sk_stamp);
 469        }
 470        err = 0;
 471        if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 472                        put_user(tv.tv_usec, &ctv->tv_usec))
 473                err = -EFAULT;
 474        return err;
 475}
 476EXPORT_SYMBOL(compat_sock_get_timestamp);
 477
 478int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 479{
 480        struct compat_timespec __user *ctv;
 481        int err;
 482        struct timespec ts;
 483
 484        if (COMPAT_USE_64BIT_TIME)
 485                return sock_get_timestampns (sk, userstamp);
 486
 487        ctv = (struct compat_timespec __user *) userstamp;
 488        err = -ENOENT;
 489        if (!sock_flag(sk, SOCK_TIMESTAMP))
 490                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 491        ts = ktime_to_timespec(sk->sk_stamp);
 492        if (ts.tv_sec == -1)
 493                return err;
 494        if (ts.tv_sec == 0) {
 495                sk->sk_stamp = ktime_get_real();
 496                ts = ktime_to_timespec(sk->sk_stamp);
 497        }
 498        err = 0;
 499        if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 500                        put_user(ts.tv_nsec, &ctv->tv_nsec))
 501                err = -EFAULT;
 502        return err;
 503}
 504EXPORT_SYMBOL(compat_sock_get_timestampns);
 505
 506COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 507                       char __user *, optval, int __user *, optlen)
 508{
 509        int err;
 510        struct socket *sock = sockfd_lookup(fd, &err);
 511
 512        if (sock) {
 513                err = security_socket_getsockopt(sock, level, optname);
 514                if (err) {
 515                        sockfd_put(sock);
 516                        return err;
 517                }
 518
 519                if (level == SOL_SOCKET)
 520                        err = compat_sock_getsockopt(sock, level,
 521                                        optname, optval, optlen);
 522                else if (sock->ops->compat_getsockopt)
 523                        err = sock->ops->compat_getsockopt(sock, level,
 524                                        optname, optval, optlen);
 525                else
 526                        err = sock->ops->getsockopt(sock, level,
 527                                        optname, optval, optlen);
 528                sockfd_put(sock);
 529        }
 530        return err;
 531}
 532
 533struct compat_group_req {
 534        __u32                            gr_interface;
 535        struct __kernel_sockaddr_storage gr_group
 536                __aligned(4);
 537} __packed;
 538
 539struct compat_group_source_req {
 540        __u32                            gsr_interface;
 541        struct __kernel_sockaddr_storage gsr_group
 542                __aligned(4);
 543        struct __kernel_sockaddr_storage gsr_source
 544                __aligned(4);
 545} __packed;
 546
 547struct compat_group_filter {
 548        __u32                            gf_interface;
 549        struct __kernel_sockaddr_storage gf_group
 550                __aligned(4);
 551        __u32                            gf_fmode;
 552        __u32                            gf_numsrc;
 553        struct __kernel_sockaddr_storage gf_slist[1]
 554                __aligned(4);
 555} __packed;
 556
 557#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 558                        sizeof(struct __kernel_sockaddr_storage))
 559
 560
 561int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 562        char __user *optval, unsigned int optlen,
 563        int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 564{
 565        char __user     *koptval = optval;
 566        int             koptlen = optlen;
 567
 568        switch (optname) {
 569        case MCAST_JOIN_GROUP:
 570        case MCAST_LEAVE_GROUP:
 571        {
 572                struct compat_group_req __user *gr32 = (void *)optval;
 573                struct group_req __user *kgr =
 574                        compat_alloc_user_space(sizeof(struct group_req));
 575                u32 interface;
 576
 577                if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 578                    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 579                    __get_user(interface, &gr32->gr_interface) ||
 580                    __put_user(interface, &kgr->gr_interface) ||
 581                    copy_in_user(&kgr->gr_group, &gr32->gr_group,
 582                                sizeof(kgr->gr_group)))
 583                        return -EFAULT;
 584                koptval = (char __user *)kgr;
 585                koptlen = sizeof(struct group_req);
 586                break;
 587        }
 588        case MCAST_JOIN_SOURCE_GROUP:
 589        case MCAST_LEAVE_SOURCE_GROUP:
 590        case MCAST_BLOCK_SOURCE:
 591        case MCAST_UNBLOCK_SOURCE:
 592        {
 593                struct compat_group_source_req __user *gsr32 = (void *)optval;
 594                struct group_source_req __user *kgsr = compat_alloc_user_space(
 595                        sizeof(struct group_source_req));
 596                u32 interface;
 597
 598                if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 599                    !access_ok(VERIFY_WRITE, kgsr,
 600                        sizeof(struct group_source_req)) ||
 601                    __get_user(interface, &gsr32->gsr_interface) ||
 602                    __put_user(interface, &kgsr->gsr_interface) ||
 603                    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 604                                sizeof(kgsr->gsr_group)) ||
 605                    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 606                                sizeof(kgsr->gsr_source)))
 607                        return -EFAULT;
 608                koptval = (char __user *)kgsr;
 609                koptlen = sizeof(struct group_source_req);
 610                break;
 611        }
 612        case MCAST_MSFILTER:
 613        {
 614                struct compat_group_filter __user *gf32 = (void *)optval;
 615                struct group_filter __user *kgf;
 616                u32 interface, fmode, numsrc;
 617
 618                if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 619                    __get_user(interface, &gf32->gf_interface) ||
 620                    __get_user(fmode, &gf32->gf_fmode) ||
 621                    __get_user(numsrc, &gf32->gf_numsrc))
 622                        return -EFAULT;
 623                koptlen = optlen + sizeof(struct group_filter) -
 624                                sizeof(struct compat_group_filter);
 625                if (koptlen < GROUP_FILTER_SIZE(numsrc))
 626                        return -EINVAL;
 627                kgf = compat_alloc_user_space(koptlen);
 628                if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 629                    __put_user(interface, &kgf->gf_interface) ||
 630                    __put_user(fmode, &kgf->gf_fmode) ||
 631                    __put_user(numsrc, &kgf->gf_numsrc) ||
 632                    copy_in_user(&kgf->gf_group, &gf32->gf_group,
 633                                sizeof(kgf->gf_group)) ||
 634                    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 635                                numsrc * sizeof(kgf->gf_slist[0]))))
 636                        return -EFAULT;
 637                koptval = (char __user *)kgf;
 638                break;
 639        }
 640
 641        default:
 642                break;
 643        }
 644        return setsockopt(sock, level, optname, koptval, koptlen);
 645}
 646EXPORT_SYMBOL(compat_mc_setsockopt);
 647
 648int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 649        char __user *optval, int __user *optlen,
 650        int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 651{
 652        struct compat_group_filter __user *gf32 = (void *)optval;
 653        struct group_filter __user *kgf;
 654        int __user      *koptlen;
 655        u32 interface, fmode, numsrc;
 656        int klen, ulen, err;
 657
 658        if (optname != MCAST_MSFILTER)
 659                return getsockopt(sock, level, optname, optval, optlen);
 660
 661        koptlen = compat_alloc_user_space(sizeof(*koptlen));
 662        if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 663            __get_user(ulen, optlen))
 664                return -EFAULT;
 665
 666        /* adjust len for pad */
 667        klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 668
 669        if (klen < GROUP_FILTER_SIZE(0))
 670                return -EINVAL;
 671
 672        if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 673            __put_user(klen, koptlen))
 674                return -EFAULT;
 675
 676        /* have to allow space for previous compat_alloc_user_space, too */
 677        kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 678
 679        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 680            __get_user(interface, &gf32->gf_interface) ||
 681            __get_user(fmode, &gf32->gf_fmode) ||
 682            __get_user(numsrc, &gf32->gf_numsrc) ||
 683            __put_user(interface, &kgf->gf_interface) ||
 684            __put_user(fmode, &kgf->gf_fmode) ||
 685            __put_user(numsrc, &kgf->gf_numsrc) ||
 686            copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 687                return -EFAULT;
 688
 689        err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 690        if (err)
 691                return err;
 692
 693        if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 694            __get_user(klen, koptlen))
 695                return -EFAULT;
 696
 697        ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 698
 699        if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 700            __put_user(ulen, optlen))
 701                return -EFAULT;
 702
 703        if (!access_ok(VERIFY_READ, kgf, klen) ||
 704            !access_ok(VERIFY_WRITE, gf32, ulen) ||
 705            __get_user(interface, &kgf->gf_interface) ||
 706            __get_user(fmode, &kgf->gf_fmode) ||
 707            __get_user(numsrc, &kgf->gf_numsrc) ||
 708            __put_user(interface, &gf32->gf_interface) ||
 709            __put_user(fmode, &gf32->gf_fmode) ||
 710            __put_user(numsrc, &gf32->gf_numsrc))
 711                return -EFAULT;
 712        if (numsrc) {
 713                int copylen;
 714
 715                klen -= GROUP_FILTER_SIZE(0);
 716                copylen = numsrc * sizeof(gf32->gf_slist[0]);
 717                if (copylen > klen)
 718                        copylen = klen;
 719                if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 720                        return -EFAULT;
 721        }
 722        return err;
 723}
 724EXPORT_SYMBOL(compat_mc_getsockopt);
 725
 726
 727/* Argument list sizes for compat_sys_socketcall */
 728#define AL(x) ((x) * sizeof(u32))
 729static unsigned char nas[21] = {
 730        AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 731        AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 732        AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 733        AL(4), AL(5), AL(4)
 734};
 735#undef AL
 736
 737COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 738{
 739        return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 740}
 741
 742COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 743                       unsigned int, vlen, unsigned int, flags)
 744{
 745        return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 746                              flags | MSG_CMSG_COMPAT);
 747}
 748
 749COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 750{
 751        return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 752}
 753
 754COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 755{
 756        return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 757}
 758
 759COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 760                       unsigned int, flags, struct sockaddr __user *, addr,
 761                       int __user *, addrlen)
 762{
 763        return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 764}
 765
 766COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 767                       unsigned int, vlen, unsigned int, flags,
 768                       struct compat_timespec __user *, timeout)
 769{
 770        int datagrams;
 771        struct timespec ktspec;
 772
 773        if (timeout == NULL)
 774                return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 775                                      flags | MSG_CMSG_COMPAT, NULL);
 776
 777        if (compat_get_timespec(&ktspec, timeout))
 778                return -EFAULT;
 779
 780        datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 781                                   flags | MSG_CMSG_COMPAT, &ktspec);
 782        if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 783                datagrams = -EFAULT;
 784
 785        return datagrams;
 786}
 787
 788COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 789{
 790        u32 a[AUDITSC_ARGS];
 791        unsigned int len;
 792        u32 a0, a1;
 793        int ret;
 794
 795        if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 796                return -EINVAL;
 797        len = nas[call];
 798        if (len > sizeof(a))
 799                return -EINVAL;
 800
 801        if (copy_from_user(a, args, len))
 802                return -EFAULT;
 803
 804        ret = audit_socketcall_compat(len / sizeof(a[0]), a);
 805        if (ret)
 806                return ret;
 807
 808        a0 = a[0];
 809        a1 = a[1];
 810
 811        switch (call) {
 812        case SYS_SOCKET:
 813                ret = sys_socket(a0, a1, a[2]);
 814                break;
 815        case SYS_BIND:
 816                ret = sys_bind(a0, compat_ptr(a1), a[2]);
 817                break;
 818        case SYS_CONNECT:
 819                ret = sys_connect(a0, compat_ptr(a1), a[2]);
 820                break;
 821        case SYS_LISTEN:
 822                ret = sys_listen(a0, a1);
 823                break;
 824        case SYS_ACCEPT:
 825                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 826                break;
 827        case SYS_GETSOCKNAME:
 828                ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 829                break;
 830        case SYS_GETPEERNAME:
 831                ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 832                break;
 833        case SYS_SOCKETPAIR:
 834                ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 835                break;
 836        case SYS_SEND:
 837                ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 838                break;
 839        case SYS_SENDTO:
 840                ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 841                break;
 842        case SYS_RECV:
 843                ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 844                break;
 845        case SYS_RECVFROM:
 846                ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 847                                          compat_ptr(a[4]), compat_ptr(a[5]));
 848                break;
 849        case SYS_SHUTDOWN:
 850                ret = sys_shutdown(a0, a1);
 851                break;
 852        case SYS_SETSOCKOPT:
 853                ret = compat_sys_setsockopt(a0, a1, a[2],
 854                                compat_ptr(a[3]), a[4]);
 855                break;
 856        case SYS_GETSOCKOPT:
 857                ret = compat_sys_getsockopt(a0, a1, a[2],
 858                                compat_ptr(a[3]), compat_ptr(a[4]));
 859                break;
 860        case SYS_SENDMSG:
 861                ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 862                break;
 863        case SYS_SENDMMSG:
 864                ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 865                break;
 866        case SYS_RECVMSG:
 867                ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 868                break;
 869        case SYS_RECVMMSG:
 870                ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 871                                          compat_ptr(a[4]));
 872                break;
 873        case SYS_ACCEPT4:
 874                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 875                break;
 876        default:
 877                ret = -EINVAL;
 878                break;
 879        }
 880        return ret;
 881}
 882
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