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
  26#include <net/scm.h>
  27#include <net/sock.h>
  28#include <net/ip.h>
  29#include <net/ipv6.h>
  30#include <asm/uaccess.h>
  31#include <net/compat.h>
  32
  33static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  34                                          struct compat_iovec __user *uiov32,
  35                                          int niov)
  36{
  37        int tot_len = 0;
  38
  39        while (niov > 0) {
  40                compat_uptr_t buf;
  41                compat_size_t len;
  42
  43                if (get_user(len, &uiov32->iov_len) ||
  44                    get_user(buf, &uiov32->iov_base))
  45                        return -EFAULT;
  46
  47                if (len > INT_MAX - tot_len)
  48                        len = INT_MAX - tot_len;
  49
  50                tot_len += len;
  51                kiov->iov_base = compat_ptr(buf);
  52                kiov->iov_len = (__kernel_size_t) len;
  53                uiov32++;
  54                kiov++;
  55                niov--;
  56        }
  57        return tot_len;
  58}
  59
  60int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  61{
  62        compat_uptr_t tmp1, tmp2, tmp3;
  63
  64        if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  65            __get_user(tmp1, &umsg->msg_name) ||
  66            __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  67            __get_user(tmp2, &umsg->msg_iov) ||
  68            __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  69            __get_user(tmp3, &umsg->msg_control) ||
  70            __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  71            __get_user(kmsg->msg_flags, &umsg->msg_flags))
  72                return -EFAULT;
  73        kmsg->msg_name = compat_ptr(tmp1);
  74        kmsg->msg_iov = compat_ptr(tmp2);
  75        kmsg->msg_control = compat_ptr(tmp3);
  76        return 0;
  77}
  78
  79/* I've named the args so it is easy to tell whose space the pointers are in. */
  80int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  81                   struct sockaddr *kern_address, int mode)
  82{
  83        int tot_len;
  84
  85        if (kern_msg->msg_namelen) {
  86                if (mode == VERIFY_READ) {
  87                        int err = move_addr_to_kernel(kern_msg->msg_name,
  88                                                      kern_msg->msg_namelen,
  89                                                      kern_address);
  90                        if (err < 0)
  91                                return err;
  92                }
  93                kern_msg->msg_name = kern_address;
  94        } else
  95                kern_msg->msg_name = NULL;
  96
  97        tot_len = iov_from_user_compat_to_kern(kern_iov,
  98                                          (struct compat_iovec __user *)kern_msg->msg_iov,
  99                                          kern_msg->msg_iovlen);
 100        if (tot_len >= 0)
 101                kern_msg->msg_iov = kern_iov;
 102
 103        return tot_len;
 104}
 105
 106/* Bleech... */
 107#define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 108
 109#define CMSG_COMPAT_DATA(cmsg)                          \
 110        ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 111#define CMSG_COMPAT_SPACE(len)                          \
 112        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 113#define CMSG_COMPAT_LEN(len)                            \
 114        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 115
 116#define CMSG_COMPAT_FIRSTHDR(msg)                       \
 117        (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 118         (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 119         (struct compat_cmsghdr __user *)NULL)
 120
 121#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 122        ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 123         (ucmlen) <= (unsigned long) \
 124         ((mhdr)->msg_controllen - \
 125          ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 126
 127static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 128                struct compat_cmsghdr __user *cmsg, int cmsg_len)
 129{
 130        char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 131        if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 132                        msg->msg_controllen)
 133                return NULL;
 134        return (struct compat_cmsghdr __user *)ptr;
 135}
 136
 137/* There is a lot of hair here because the alignment rules (and
 138 * thus placement) of cmsg headers and length are different for
 139 * 32-bit apps.  -DaveM
 140 */
 141int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 142                               unsigned char *stackbuf, int stackbuf_size)
 143{
 144        struct compat_cmsghdr __user *ucmsg;
 145        struct cmsghdr *kcmsg, *kcmsg_base;
 146        compat_size_t ucmlen;
 147        __kernel_size_t kcmlen, tmp;
 148        int err = -EFAULT;
 149
 150        kcmlen = 0;
 151        kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 152        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 153        while (ucmsg != NULL) {
 154                if (get_user(ucmlen, &ucmsg->cmsg_len))
 155                        return -EFAULT;
 156
 157                /* Catch bogons. */
 158                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 159                        return -EINVAL;
 160
 161                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 162                       CMSG_ALIGN(sizeof(struct cmsghdr)));
 163                tmp = CMSG_ALIGN(tmp);
 164                kcmlen += tmp;
 165                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 166        }
 167        if (kcmlen == 0)
 168                return -EINVAL;
 169
 170        /* The kcmlen holds the 64-bit version of the control length.
 171         * It may not be modified as we do not stick it into the kmsg
 172         * until we have successfully copied over all of the data
 173         * from the user.
 174         */
 175        if (kcmlen > stackbuf_size)
 176                kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 177        if (kcmsg == NULL)
 178                return -ENOBUFS;
 179
 180        /* Now copy them over neatly. */
 181        memset(kcmsg, 0, kcmlen);
 182        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 183        while (ucmsg != NULL) {
 184                if (__get_user(ucmlen, &ucmsg->cmsg_len))
 185                        goto Efault;
 186                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 187                        goto Einval;
 188                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 189                       CMSG_ALIGN(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 - CMSG_COMPAT_ALIGN(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        /* Ok, looks like we made it.  Hook it up and return success. */
 207        kmsg->msg_control = kcmsg_base;
 208        kmsg->msg_controllen = kcmlen;
 209        return 0;
 210
 211Einval:
 212        err = -EINVAL;
 213Efault:
 214        if (kcmsg_base != (struct cmsghdr *)stackbuf)
 215                sock_kfree_s(sk, kcmsg_base, kcmlen);
 216        return err;
 217}
 218
 219int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 220{
 221        struct compat_timeval ctv;
 222        struct compat_timespec cts[3];
 223        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 224        struct compat_cmsghdr cmhdr;
 225        int cmlen;
 226
 227        if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 228                kmsg->msg_flags |= MSG_CTRUNC;
 229                return 0; /* XXX: return error? check spec. */
 230        }
 231
 232        if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 233                struct timeval *tv = (struct timeval *)data;
 234                ctv.tv_sec = tv->tv_sec;
 235                ctv.tv_usec = tv->tv_usec;
 236                data = &ctv;
 237                len = sizeof(ctv);
 238        }
 239        if (level == SOL_SOCKET &&
 240            (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 241                int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 242                int i;
 243                struct timespec *ts = (struct timespec *)data;
 244                for (i = 0; i < count; i++) {
 245                        cts[i].tv_sec = ts[i].tv_sec;
 246                        cts[i].tv_nsec = ts[i].tv_nsec;
 247                }
 248                data = &cts;
 249                len = sizeof(cts[0]) * count;
 250        }
 251
 252        cmlen = CMSG_COMPAT_LEN(len);
 253        if (kmsg->msg_controllen < cmlen) {
 254                kmsg->msg_flags |= MSG_CTRUNC;
 255                cmlen = kmsg->msg_controllen;
 256        }
 257        cmhdr.cmsg_level = level;
 258        cmhdr.cmsg_type = type;
 259        cmhdr.cmsg_len = cmlen;
 260
 261        if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 262                return -EFAULT;
 263        if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 264                return -EFAULT;
 265        cmlen = CMSG_COMPAT_SPACE(len);
 266        if (kmsg->msg_controllen < cmlen)
 267                cmlen = kmsg->msg_controllen;
 268        kmsg->msg_control += cmlen;
 269        kmsg->msg_controllen -= cmlen;
 270        return 0;
 271}
 272
 273void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 274{
 275        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 276        int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 277        int fdnum = scm->fp->count;
 278        struct file **fp = scm->fp->fp;
 279        int __user *cmfptr;
 280        int err = 0, i;
 281
 282        if (fdnum < fdmax)
 283                fdmax = fdnum;
 284
 285        for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 286                int new_fd;
 287                err = security_file_receive(fp[i]);
 288                if (err)
 289                        break;
 290                err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 291                                          ? O_CLOEXEC : 0);
 292                if (err < 0)
 293                        break;
 294                new_fd = err;
 295                err = put_user(new_fd, cmfptr);
 296                if (err) {
 297                        put_unused_fd(new_fd);
 298                        break;
 299                }
 300                /* Bump the usage count and install the file. */
 301                get_file(fp[i]);
 302                fd_install(new_fd, fp[i]);
 303        }
 304
 305        if (i > 0) {
 306                int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 307                err = put_user(SOL_SOCKET, &cm->cmsg_level);
 308                if (!err)
 309                        err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 310                if (!err)
 311                        err = put_user(cmlen, &cm->cmsg_len);
 312                if (!err) {
 313                        cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 314                        kmsg->msg_control += cmlen;
 315                        kmsg->msg_controllen -= cmlen;
 316                }
 317        }
 318        if (i < fdnum)
 319                kmsg->msg_flags |= MSG_CTRUNC;
 320
 321        /*
 322         * All of the files that fit in the message have had their
 323         * usage counts incremented, so we just free the list.
 324         */
 325        __scm_destroy(scm);
 326}
 327
 328/*
 329 * A struct sock_filter is architecture independent.
 330 */
 331struct compat_sock_fprog {
 332        u16             len;
 333        compat_uptr_t   filter;         /* struct sock_filter * */
 334};
 335
 336static int do_set_attach_filter(struct socket *sock, int level, int optname,
 337                                char __user *optval, unsigned int optlen)
 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        compat_uptr_t ptr;
 342        u16 len;
 343
 344        if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 345            !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 346            __get_user(len, &fprog32->len) ||
 347            __get_user(ptr, &fprog32->filter) ||
 348            __put_user(len, &kfprog->len) ||
 349            __put_user(compat_ptr(ptr), &kfprog->filter))
 350                return -EFAULT;
 351
 352        return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 353                              sizeof(struct sock_fprog));
 354}
 355
 356static int do_set_sock_timeout(struct socket *sock, int level,
 357                int optname, char __user *optval, unsigned int optlen)
 358{
 359        struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 360        struct timeval ktime;
 361        mm_segment_t old_fs;
 362        int err;
 363
 364        if (optlen < sizeof(*up))
 365                return -EINVAL;
 366        if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 367            __get_user(ktime.tv_sec, &up->tv_sec) ||
 368            __get_user(ktime.tv_usec, &up->tv_usec))
 369                return -EFAULT;
 370        old_fs = get_fs();
 371        set_fs(KERNEL_DS);
 372        err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 373        set_fs(old_fs);
 374
 375        return err;
 376}
 377
 378static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 379                                char __user *optval, unsigned int optlen)
 380{
 381        if (optname == SO_ATTACH_FILTER)
 382                return do_set_attach_filter(sock, level, optname,
 383                                            optval, optlen);
 384        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 385                return do_set_sock_timeout(sock, level, optname, optval, optlen);
 386
 387        return sock_setsockopt(sock, level, optname, optval, optlen);
 388}
 389
 390asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 391                                char __user *optval, unsigned int optlen)
 392{
 393        int err;
 394        struct socket *sock = sockfd_lookup(fd, &err);
 395
 396        if (sock) {
 397                err = security_socket_setsockopt(sock, level, optname);
 398                if (err) {
 399                        sockfd_put(sock);
 400                        return err;
 401                }
 402
 403                if (level == SOL_SOCKET)
 404                        err = compat_sock_setsockopt(sock, level,
 405                                        optname, optval, optlen);
 406                else if (sock->ops->compat_setsockopt)
 407                        err = sock->ops->compat_setsockopt(sock, level,
 408                                        optname, optval, optlen);
 409                else
 410                        err = sock->ops->setsockopt(sock, level,
 411                                        optname, optval, optlen);
 412                sockfd_put(sock);
 413        }
 414        return err;
 415}
 416
 417static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 418                char __user *optval, int __user *optlen)
 419{
 420        struct compat_timeval __user *up;
 421        struct timeval ktime;
 422        mm_segment_t old_fs;
 423        int len, err;
 424
 425        up = (struct compat_timeval __user *) optval;
 426        if (get_user(len, optlen))
 427                return -EFAULT;
 428        if (len < sizeof(*up))
 429                return -EINVAL;
 430        len = sizeof(ktime);
 431        old_fs = get_fs();
 432        set_fs(KERNEL_DS);
 433        err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 434        set_fs(old_fs);
 435
 436        if (!err) {
 437                if (put_user(sizeof(*up), optlen) ||
 438                    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 439                    __put_user(ktime.tv_sec, &up->tv_sec) ||
 440                    __put_user(ktime.tv_usec, &up->tv_usec))
 441                        err = -EFAULT;
 442        }
 443        return err;
 444}
 445
 446static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 447                                char __user *optval, int __user *optlen)
 448{
 449        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 450                return do_get_sock_timeout(sock, level, optname, optval, optlen);
 451        return sock_getsockopt(sock, level, optname, optval, optlen);
 452}
 453
 454int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 455{
 456        struct compat_timeval __user *ctv =
 457                        (struct compat_timeval __user *) userstamp;
 458        int err = -ENOENT;
 459        struct timeval tv;
 460
 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                        (struct compat_timespec __user *) userstamp;
 482        int err = -ENOENT;
 483        struct timespec ts;
 484
 485        if (!sock_flag(sk, SOCK_TIMESTAMP))
 486                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 487        ts = ktime_to_timespec(sk->sk_stamp);
 488        if (ts.tv_sec == -1)
 489                return err;
 490        if (ts.tv_sec == 0) {
 491                sk->sk_stamp = ktime_get_real();
 492                ts = ktime_to_timespec(sk->sk_stamp);
 493        }
 494        err = 0;
 495        if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 496                        put_user(ts.tv_nsec, &ctv->tv_nsec))
 497                err = -EFAULT;
 498        return err;
 499}
 500EXPORT_SYMBOL(compat_sock_get_timestampns);
 501
 502asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 503                                char __user *optval, int __user *optlen)
 504{
 505        int err;
 506        struct socket *sock = sockfd_lookup(fd, &err);
 507
 508        if (sock) {
 509                err = security_socket_getsockopt(sock, level, optname);
 510                if (err) {
 511                        sockfd_put(sock);
 512                        return err;
 513                }
 514
 515                if (level == SOL_SOCKET)
 516                        err = compat_sock_getsockopt(sock, level,
 517                                        optname, optval, optlen);
 518                else if (sock->ops->compat_getsockopt)
 519                        err = sock->ops->compat_getsockopt(sock, level,
 520                                        optname, optval, optlen);
 521                else
 522                        err = sock->ops->getsockopt(sock, level,
 523                                        optname, optval, optlen);
 524                sockfd_put(sock);
 525        }
 526        return err;
 527}
 528
 529struct compat_group_req {
 530        __u32                            gr_interface;
 531        struct __kernel_sockaddr_storage gr_group
 532                __attribute__ ((aligned(4)));
 533} __packed;
 534
 535struct compat_group_source_req {
 536        __u32                            gsr_interface;
 537        struct __kernel_sockaddr_storage gsr_group
 538                __attribute__ ((aligned(4)));
 539        struct __kernel_sockaddr_storage gsr_source
 540                __attribute__ ((aligned(4)));
 541} __packed;
 542
 543struct compat_group_filter {
 544        __u32                            gf_interface;
 545        struct __kernel_sockaddr_storage gf_group
 546                __attribute__ ((aligned(4)));
 547        __u32                            gf_fmode;
 548        __u32                            gf_numsrc;
 549        struct __kernel_sockaddr_storage gf_slist[1]
 550                __attribute__ ((aligned(4)));
 551} __packed;
 552
 553#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 554                        sizeof(struct __kernel_sockaddr_storage))
 555
 556
 557int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 558        char __user *optval, unsigned int optlen,
 559        int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 560{
 561        char __user     *koptval = optval;
 562        int             koptlen = optlen;
 563
 564        switch (optname) {
 565        case MCAST_JOIN_GROUP:
 566        case MCAST_LEAVE_GROUP:
 567        {
 568                struct compat_group_req __user *gr32 = (void *)optval;
 569                struct group_req __user *kgr =
 570                        compat_alloc_user_space(sizeof(struct group_req));
 571                u32 interface;
 572
 573                if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 574                    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 575                    __get_user(interface, &gr32->gr_interface) ||
 576                    __put_user(interface, &kgr->gr_interface) ||
 577                    copy_in_user(&kgr->gr_group, &gr32->gr_group,
 578                                sizeof(kgr->gr_group)))
 579                        return -EFAULT;
 580                koptval = (char __user *)kgr;
 581                koptlen = sizeof(struct group_req);
 582                break;
 583        }
 584        case MCAST_JOIN_SOURCE_GROUP:
 585        case MCAST_LEAVE_SOURCE_GROUP:
 586        case MCAST_BLOCK_SOURCE:
 587        case MCAST_UNBLOCK_SOURCE:
 588        {
 589                struct compat_group_source_req __user *gsr32 = (void *)optval;
 590                struct group_source_req __user *kgsr = compat_alloc_user_space(
 591                        sizeof(struct group_source_req));
 592                u32 interface;
 593
 594                if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 595                    !access_ok(VERIFY_WRITE, kgsr,
 596                        sizeof(struct group_source_req)) ||
 597                    __get_user(interface, &gsr32->gsr_interface) ||
 598                    __put_user(interface, &kgsr->gsr_interface) ||
 599                    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 600                                sizeof(kgsr->gsr_group)) ||
 601                    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 602                                sizeof(kgsr->gsr_source)))
 603                        return -EFAULT;
 604                koptval = (char __user *)kgsr;
 605                koptlen = sizeof(struct group_source_req);
 606                break;
 607        }
 608        case MCAST_MSFILTER:
 609        {
 610                struct compat_group_filter __user *gf32 = (void *)optval;
 611                struct group_filter __user *kgf;
 612                u32 interface, fmode, numsrc;
 613
 614                if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 615                    __get_user(interface, &gf32->gf_interface) ||
 616                    __get_user(fmode, &gf32->gf_fmode) ||
 617                    __get_user(numsrc, &gf32->gf_numsrc))
 618                        return -EFAULT;
 619                koptlen = optlen + sizeof(struct group_filter) -
 620                                sizeof(struct compat_group_filter);
 621                if (koptlen < GROUP_FILTER_SIZE(numsrc))
 622                        return -EINVAL;
 623                kgf = compat_alloc_user_space(koptlen);
 624                if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 625                    __put_user(interface, &kgf->gf_interface) ||
 626                    __put_user(fmode, &kgf->gf_fmode) ||
 627                    __put_user(numsrc, &kgf->gf_numsrc) ||
 628                    copy_in_user(&kgf->gf_group, &gf32->gf_group,
 629                                sizeof(kgf->gf_group)) ||
 630                    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 631                                numsrc * sizeof(kgf->gf_slist[0]))))
 632                        return -EFAULT;
 633                koptval = (char __user *)kgf;
 634                break;
 635        }
 636
 637        default:
 638                break;
 639        }
 640        return setsockopt(sock, level, optname, koptval, koptlen);
 641}
 642EXPORT_SYMBOL(compat_mc_setsockopt);
 643
 644int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 645        char __user *optval, int __user *optlen,
 646        int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 647{
 648        struct compat_group_filter __user *gf32 = (void *)optval;
 649        struct group_filter __user *kgf;
 650        int __user      *koptlen;
 651        u32 interface, fmode, numsrc;
 652        int klen, ulen, err;
 653
 654        if (optname != MCAST_MSFILTER)
 655                return getsockopt(sock, level, optname, optval, optlen);
 656
 657        koptlen = compat_alloc_user_space(sizeof(*koptlen));
 658        if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 659            __get_user(ulen, optlen))
 660                return -EFAULT;
 661
 662        /* adjust len for pad */
 663        klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 664
 665        if (klen < GROUP_FILTER_SIZE(0))
 666                return -EINVAL;
 667
 668        if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 669            __put_user(klen, koptlen))
 670                return -EFAULT;
 671
 672        /* have to allow space for previous compat_alloc_user_space, too */
 673        kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 674
 675        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 676            __get_user(interface, &gf32->gf_interface) ||
 677            __get_user(fmode, &gf32->gf_fmode) ||
 678            __get_user(numsrc, &gf32->gf_numsrc) ||
 679            __put_user(interface, &kgf->gf_interface) ||
 680            __put_user(fmode, &kgf->gf_fmode) ||
 681            __put_user(numsrc, &kgf->gf_numsrc) ||
 682            copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 683                return -EFAULT;
 684
 685        err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 686        if (err)
 687                return err;
 688
 689        if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 690            __get_user(klen, koptlen))
 691                return -EFAULT;
 692
 693        ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 694
 695        if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 696            __put_user(ulen, optlen))
 697                return -EFAULT;
 698
 699        if (!access_ok(VERIFY_READ, kgf, klen) ||
 700            !access_ok(VERIFY_WRITE, gf32, ulen) ||
 701            __get_user(interface, &kgf->gf_interface) ||
 702            __get_user(fmode, &kgf->gf_fmode) ||
 703            __get_user(numsrc, &kgf->gf_numsrc) ||
 704            __put_user(interface, &gf32->gf_interface) ||
 705            __put_user(fmode, &gf32->gf_fmode) ||
 706            __put_user(numsrc, &gf32->gf_numsrc))
 707                return -EFAULT;
 708        if (numsrc) {
 709                int copylen;
 710
 711                klen -= GROUP_FILTER_SIZE(0);
 712                copylen = numsrc * sizeof(gf32->gf_slist[0]);
 713                if (copylen > klen)
 714                        copylen = klen;
 715                if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 716                        return -EFAULT;
 717        }
 718        return err;
 719}
 720EXPORT_SYMBOL(compat_mc_getsockopt);
 721
 722
 723/* Argument list sizes for compat_sys_socketcall */
 724#define AL(x) ((x) * sizeof(u32))
 725static unsigned char nas[21] = {
 726        AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 727        AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 728        AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 729        AL(4), AL(5), AL(4)
 730};
 731#undef AL
 732
 733asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 734{
 735        return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 736}
 737
 738asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 739                                    unsigned vlen, unsigned int flags)
 740{
 741        return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 742                              flags | MSG_CMSG_COMPAT);
 743}
 744
 745asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 746{
 747        return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 748}
 749
 750asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags)
 751{
 752        return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 753}
 754
 755asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
 756                                    unsigned flags, struct sockaddr __user *addr,
 757                                    int __user *addrlen)
 758{
 759        return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 760}
 761
 762asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 763                                    unsigned vlen, unsigned int flags,
 764                                    struct compat_timespec __user *timeout)
 765{
 766        int datagrams;
 767        struct timespec ktspec;
 768
 769        if (timeout == NULL)
 770                return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 771                                      flags | MSG_CMSG_COMPAT, NULL);
 772
 773        if (get_compat_timespec(&ktspec, timeout))
 774                return -EFAULT;
 775
 776        datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 777                                   flags | MSG_CMSG_COMPAT, &ktspec);
 778        if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
 779                datagrams = -EFAULT;
 780
 781        return datagrams;
 782}
 783
 784asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 785{
 786        int ret;
 787        u32 a[6];
 788        u32 a0, a1;
 789
 790        if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 791                return -EINVAL;
 792        if (copy_from_user(a, args, nas[call]))
 793                return -EFAULT;
 794        a0 = a[0];
 795        a1 = a[1];
 796
 797        switch (call) {
 798        case SYS_SOCKET:
 799                ret = sys_socket(a0, a1, a[2]);
 800                break;
 801        case SYS_BIND:
 802                ret = sys_bind(a0, compat_ptr(a1), a[2]);
 803                break;
 804        case SYS_CONNECT:
 805                ret = sys_connect(a0, compat_ptr(a1), a[2]);
 806                break;
 807        case SYS_LISTEN:
 808                ret = sys_listen(a0, a1);
 809                break;
 810        case SYS_ACCEPT:
 811                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 812                break;
 813        case SYS_GETSOCKNAME:
 814                ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 815                break;
 816        case SYS_GETPEERNAME:
 817                ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 818                break;
 819        case SYS_SOCKETPAIR:
 820                ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 821                break;
 822        case SYS_SEND:
 823                ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 824                break;
 825        case SYS_SENDTO:
 826                ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 827                break;
 828        case SYS_RECV:
 829                ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 830                break;
 831        case SYS_RECVFROM:
 832                ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 833                                          compat_ptr(a[4]), compat_ptr(a[5]));
 834                break;
 835        case SYS_SHUTDOWN:
 836                ret = sys_shutdown(a0, a1);
 837                break;
 838        case SYS_SETSOCKOPT:
 839                ret = compat_sys_setsockopt(a0, a1, a[2],
 840                                compat_ptr(a[3]), a[4]);
 841                break;
 842        case SYS_GETSOCKOPT:
 843                ret = compat_sys_getsockopt(a0, a1, a[2],
 844                                compat_ptr(a[3]), compat_ptr(a[4]));
 845                break;
 846        case SYS_SENDMSG:
 847                ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 848                break;
 849        case SYS_SENDMMSG:
 850                ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 851                break;
 852        case SYS_RECVMSG:
 853                ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 854                break;
 855        case SYS_RECVMMSG:
 856                ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 857                                          compat_ptr(a[4]));
 858                break;
 859        case SYS_ACCEPT4:
 860                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 861                break;
 862        default:
 863                ret = -EINVAL;
 864                break;
 865        }
 866        return ret;
 867}
 868
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