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