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/fs.h>
  16#include <linux/types.h>
  17#include <linux/file.h>
  18#include <linux/icmpv6.h>
  19#include <linux/socket.h>
  20#include <linux/syscalls.h>
  21#include <linux/filter.h>
  22#include <linux/compat.h>
  23#include <linux/security.h>
  24
  25#include <net/scm.h>
  26#include <net/sock.h>
  27#include <net/ip.h>
  28#include <net/ipv6.h>
  29#include <asm/uaccess.h>
  30#include <net/compat.h>
  31
  32static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  33                                          struct compat_iovec __user *uiov32,
  34                                          int niov)
  35{
  36        int tot_len = 0;
  37
  38        while (niov > 0) {
  39                compat_uptr_t buf;
  40                compat_size_t len;
  41
  42                if (get_user(len, &uiov32->iov_len) ||
  43                   get_user(buf, &uiov32->iov_base)) {
  44                        tot_len = -EFAULT;
  45                        break;
  46                }
  47                tot_len += len;
  48                kiov->iov_base = compat_ptr(buf);
  49                kiov->iov_len = (__kernel_size_t) len;
  50                uiov32++;
  51                kiov++;
  52                niov--;
  53        }
  54        return tot_len;
  55}
  56
  57int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  58{
  59        compat_uptr_t tmp1, tmp2, tmp3;
  60
  61        if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  62            __get_user(tmp1, &umsg->msg_name) ||
  63            __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  64            __get_user(tmp2, &umsg->msg_iov) ||
  65            __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  66            __get_user(tmp3, &umsg->msg_control) ||
  67            __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  68            __get_user(kmsg->msg_flags, &umsg->msg_flags))
  69                return -EFAULT;
  70        kmsg->msg_name = compat_ptr(tmp1);
  71        kmsg->msg_iov = compat_ptr(tmp2);
  72        kmsg->msg_control = compat_ptr(tmp3);
  73        return 0;
  74}
  75
  76/* I've named the args so it is easy to tell whose space the pointers are in. */
  77int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  78                   struct sockaddr *kern_address, int mode)
  79{
  80        int tot_len;
  81
  82        if (kern_msg->msg_namelen) {
  83                if (mode==VERIFY_READ) {
  84                        int err = move_addr_to_kernel(kern_msg->msg_name,
  85                                                      kern_msg->msg_namelen,
  86                                                      kern_address);
  87                        if (err < 0)
  88                                return err;
  89                }
  90                kern_msg->msg_name = kern_address;
  91        } else
  92                kern_msg->msg_name = NULL;
  93
  94        tot_len = iov_from_user_compat_to_kern(kern_iov,
  95                                          (struct compat_iovec __user *)kern_msg->msg_iov,
  96                                          kern_msg->msg_iovlen);
  97        if (tot_len >= 0)
  98                kern_msg->msg_iov = kern_iov;
  99
 100        return tot_len;
 101}
 102
 103/* Bleech... */
 104#define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 105
 106#define CMSG_COMPAT_DATA(cmsg)                          \
 107        ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 108#define CMSG_COMPAT_SPACE(len)                          \
 109        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 110#define CMSG_COMPAT_LEN(len)                            \
 111        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 112
 113#define CMSG_COMPAT_FIRSTHDR(msg)                       \
 114        (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 115         (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 116         (struct compat_cmsghdr __user *)NULL)
 117
 118#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 119        ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 120         (ucmlen) <= (unsigned long) \
 121         ((mhdr)->msg_controllen - \
 122          ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 123
 124static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 125                struct compat_cmsghdr __user *cmsg, int cmsg_len)
 126{
 127        char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 128        if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 129                        msg->msg_controllen)
 130                return NULL;
 131        return (struct compat_cmsghdr __user *)ptr;
 132}
 133
 134/* There is a lot of hair here because the alignment rules (and
 135 * thus placement) of cmsg headers and length are different for
 136 * 32-bit apps.  -DaveM
 137 */
 138int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 139                               unsigned char *stackbuf, int stackbuf_size)
 140{
 141        struct compat_cmsghdr __user *ucmsg;
 142        struct cmsghdr *kcmsg, *kcmsg_base;
 143        compat_size_t ucmlen;
 144        __kernel_size_t kcmlen, tmp;
 145        int err = -EFAULT;
 146
 147        kcmlen = 0;
 148        kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 149        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 150        while (ucmsg != NULL) {
 151                if (get_user(ucmlen, &ucmsg->cmsg_len))
 152                        return -EFAULT;
 153
 154                /* Catch bogons. */
 155                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 156                        return -EINVAL;
 157
 158                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 159                       CMSG_ALIGN(sizeof(struct cmsghdr)));
 160                tmp = CMSG_ALIGN(tmp);
 161                kcmlen += tmp;
 162                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 163        }
 164        if (kcmlen == 0)
 165                return -EINVAL;
 166
 167        /* The kcmlen holds the 64-bit version of the control length.
 168         * It may not be modified as we do not stick it into the kmsg
 169         * until we have successfully copied over all of the data
 170         * from the user.
 171         */
 172        if (kcmlen > stackbuf_size)
 173                kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 174        if (kcmsg == NULL)
 175                return -ENOBUFS;
 176
 177        /* Now copy them over neatly. */
 178        memset(kcmsg, 0, kcmlen);
 179        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 180        while (ucmsg != NULL) {
 181                if (__get_user(ucmlen, &ucmsg->cmsg_len))
 182                        goto Efault;
 183                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 184                        goto Einval;
 185                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 186                       CMSG_ALIGN(sizeof(struct cmsghdr)));
 187                if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 188                        goto Einval;
 189                kcmsg->cmsg_len = tmp;
 190                tmp = CMSG_ALIGN(tmp);
 191                if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 192                    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 193                    copy_from_user(CMSG_DATA(kcmsg),
 194                                   CMSG_COMPAT_DATA(ucmsg),
 195                                   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 196                        goto Efault;
 197
 198                /* Advance. */
 199                kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 200                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 201        }
 202
 203        /* Ok, looks like we made it.  Hook it up and return success. */
 204        kmsg->msg_control = kcmsg_base;
 205        kmsg->msg_controllen = kcmlen;
 206        return 0;
 207
 208Einval:
 209        err = -EINVAL;
 210Efault:
 211        if (kcmsg_base != (struct cmsghdr *)stackbuf)
 212                sock_kfree_s(sk, kcmsg_base, kcmlen);
 213        return err;
 214}
 215
 216int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 217{
 218        struct compat_timeval ctv;
 219        struct compat_timespec cts[3];
 220        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 221        struct compat_cmsghdr cmhdr;
 222        int cmlen;
 223
 224        if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 225                kmsg->msg_flags |= MSG_CTRUNC;
 226                return 0; /* XXX: return error? check spec. */
 227        }
 228
 229        if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 230                struct timeval *tv = (struct timeval *)data;
 231                ctv.tv_sec = tv->tv_sec;
 232                ctv.tv_usec = tv->tv_usec;
 233                data = &ctv;
 234                len = sizeof(ctv);
 235        }
 236        if (level == SOL_SOCKET &&
 237            (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 238                int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 239                int i;
 240                struct timespec *ts = (struct timespec *)data;
 241                for (i = 0; i < count; i++) {
 242                        cts[i].tv_sec = ts[i].tv_sec;
 243                        cts[i].tv_nsec = ts[i].tv_nsec;
 244                }
 245                data = &cts;
 246                len = sizeof(cts[0]) * count;
 247        }
 248
 249        cmlen = CMSG_COMPAT_LEN(len);
 250        if (kmsg->msg_controllen < cmlen) {
 251                kmsg->msg_flags |= MSG_CTRUNC;
 252                cmlen = kmsg->msg_controllen;
 253        }
 254        cmhdr.cmsg_level = level;
 255        cmhdr.cmsg_type = type;
 256        cmhdr.cmsg_len = cmlen;
 257
 258        if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 259                return -EFAULT;
 260        if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 261                return -EFAULT;
 262        cmlen = CMSG_COMPAT_SPACE(len);
 263        if (kmsg->msg_controllen < cmlen)
 264                cmlen = kmsg->msg_controllen;
 265        kmsg->msg_control += cmlen;
 266        kmsg->msg_controllen -= cmlen;
 267        return 0;
 268}
 269
 270void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 271{
 272        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 273        int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 274        int fdnum = scm->fp->count;
 275        struct file **fp = scm->fp->fp;
 276        int __user *cmfptr;
 277        int err = 0, i;
 278
 279        if (fdnum < fdmax)
 280                fdmax = fdnum;
 281
 282        for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 283                int new_fd;
 284                err = security_file_receive(fp[i]);
 285                if (err)
 286                        break;
 287                err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 288                                          ? O_CLOEXEC : 0);
 289                if (err < 0)
 290                        break;
 291                new_fd = err;
 292                err = put_user(new_fd, cmfptr);
 293                if (err) {
 294                        put_unused_fd(new_fd);
 295                        break;
 296                }
 297                /* Bump the usage count and install the file. */
 298                get_file(fp[i]);
 299                fd_install(new_fd, fp[i]);
 300        }
 301
 302        if (i > 0) {
 303                int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 304                err = put_user(SOL_SOCKET, &cm->cmsg_level);
 305                if (!err)
 306                        err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 307                if (!err)
 308                        err = put_user(cmlen, &cm->cmsg_len);
 309                if (!err) {
 310                        cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 311                        kmsg->msg_control += cmlen;
 312                        kmsg->msg_controllen -= cmlen;
 313                }
 314        }
 315        if (i < fdnum)
 316                kmsg->msg_flags |= MSG_CTRUNC;
 317
 318        /*
 319         * All of the files that fit in the message have had their
 320         * usage counts incremented, so we just free the list.
 321         */
 322        __scm_destroy(scm);
 323}
 324
 325/*
 326 * A struct sock_filter is architecture independent.
 327 */
 328struct compat_sock_fprog {
 329        u16             len;
 330        compat_uptr_t   filter;         /* struct sock_filter * */
 331};
 332
 333static int do_set_attach_filter(struct socket *sock, int level, int optname,
 334                                char __user *optval, int optlen)
 335{
 336        struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 337        struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 338        compat_uptr_t ptr;
 339        u16 len;
 340
 341        if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 342            !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 343            __get_user(len, &fprog32->len) ||
 344            __get_user(ptr, &fprog32->filter) ||
 345            __put_user(len, &kfprog->len) ||
 346            __put_user(compat_ptr(ptr), &kfprog->filter))
 347                return -EFAULT;
 348
 349        return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 350                              sizeof(struct sock_fprog));
 351}
 352
 353static int do_set_sock_timeout(struct socket *sock, int level,
 354                int optname, char __user *optval, int optlen)
 355{
 356        struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
 357        struct timeval ktime;
 358        mm_segment_t old_fs;
 359        int err;
 360
 361        if (optlen < sizeof(*up))
 362                return -EINVAL;
 363        if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 364            __get_user(ktime.tv_sec, &up->tv_sec) ||
 365            __get_user(ktime.tv_usec, &up->tv_usec))
 366                return -EFAULT;
 367        old_fs = get_fs();
 368        set_fs(KERNEL_DS);
 369        err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
 370        set_fs(old_fs);
 371
 372        return err;
 373}
 374
 375static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 376                                char __user *optval, int optlen)
 377{
 378        if (optname == SO_ATTACH_FILTER)
 379                return do_set_attach_filter(sock, level, optname,
 380                                            optval, optlen);
 381        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 382                return do_set_sock_timeout(sock, level, optname, optval, optlen);
 383
 384        return sock_setsockopt(sock, level, optname, optval, optlen);
 385}
 386
 387asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 388                                char __user *optval, int optlen)
 389{
 390        int err;
 391        struct socket *sock;
 392
 393        if (optlen < 0)
 394                return -EINVAL;
 395
 396        if ((sock = sockfd_lookup(fd, &err))!=NULL)
 397        {
 398                err = security_socket_setsockopt(sock,level,optname);
 399                if (err) {
 400                        sockfd_put(sock);
 401                        return err;
 402                }
 403
 404                if (level == SOL_SOCKET)
 405                        err = compat_sock_setsockopt(sock, level,
 406                                        optname, optval, optlen);
 407                else if (sock->ops->compat_setsockopt)
 408                        err = sock->ops->compat_setsockopt(sock, level,
 409                                        optname, optval, optlen);
 410                else
 411                        err = sock->ops->setsockopt(sock, level,
 412                                        optname, optval, optlen);
 413                sockfd_put(sock);
 414        }
 415        return err;
 416}
 417
 418static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 419                char __user *optval, int __user *optlen)
 420{
 421        struct compat_timeval __user *up;
 422        struct timeval ktime;
 423        mm_segment_t old_fs;
 424        int len, err;
 425
 426        up = (struct compat_timeval __user *) optval;
 427        if (get_user(len, optlen))
 428                return -EFAULT;
 429        if (len < sizeof(*up))
 430                return -EINVAL;
 431        len = sizeof(ktime);
 432        old_fs = get_fs();
 433        set_fs(KERNEL_DS);
 434        err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 435        set_fs(old_fs);
 436
 437        if (!err) {
 438                if (put_user(sizeof(*up), optlen) ||
 439                    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 440                    __put_user(ktime.tv_sec, &up->tv_sec) ||
 441                    __put_user(ktime.tv_usec, &up->tv_usec))
 442                        err = -EFAULT;
 443        }
 444        return err;
 445}
 446
 447static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 448                                char __user *optval, int __user *optlen)
 449{
 450        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 451                return do_get_sock_timeout(sock, level, optname, optval, optlen);
 452        return sock_getsockopt(sock, level, optname, optval, optlen);
 453}
 454
 455int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 456{
 457        struct compat_timeval __user *ctv =
 458                        (struct compat_timeval __user*) userstamp;
 459        int err = -ENOENT;
 460        struct timeval tv;
 461
 462        if (!sock_flag(sk, SOCK_TIMESTAMP))
 463                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 464        tv = ktime_to_timeval(sk->sk_stamp);
 465        if (tv.tv_sec == -1)
 466                return err;
 467        if (tv.tv_sec == 0) {
 468                sk->sk_stamp = ktime_get_real();
 469                tv = ktime_to_timeval(sk->sk_stamp);
 470        }
 471        err = 0;
 472        if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 473                        put_user(tv.tv_usec, &ctv->tv_usec))
 474                err = -EFAULT;
 475        return err;
 476}
 477EXPORT_SYMBOL(compat_sock_get_timestamp);
 478
 479int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 480{
 481        struct compat_timespec __user *ctv =
 482                        (struct compat_timespec __user*) userstamp;
 483        int err = -ENOENT;
 484        struct timespec ts;
 485
 486        if (!sock_flag(sk, SOCK_TIMESTAMP))
 487                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 488        ts = ktime_to_timespec(sk->sk_stamp);
 489        if (ts.tv_sec == -1)
 490                return err;
 491        if (ts.tv_sec == 0) {
 492                sk->sk_stamp = ktime_get_real();
 493                ts = ktime_to_timespec(sk->sk_stamp);
 494        }
 495        err = 0;
 496        if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 497                        put_user(ts.tv_nsec, &ctv->tv_nsec))
 498                err = -EFAULT;
 499        return err;
 500}
 501EXPORT_SYMBOL(compat_sock_get_timestampns);
 502
 503asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 504                                char __user *optval, int __user *optlen)
 505{
 506        int err;
 507        struct socket *sock;
 508
 509        if ((sock = sockfd_lookup(fd, &err))!=NULL)
 510        {
 511                err = security_socket_getsockopt(sock, level,
 512                                                           optname);
 513                if (err) {
 514                        sockfd_put(sock);
 515                        return err;
 516                }
 517
 518                if (level == SOL_SOCKET)
 519                        err = compat_sock_getsockopt(sock, level,
 520                                        optname, optval, optlen);
 521                else if (sock->ops->compat_getsockopt)
 522                        err = sock->ops->compat_getsockopt(sock, level,
 523                                        optname, optval, optlen);
 524                else
 525                        err = sock->ops->getsockopt(sock, level,
 526                                        optname, optval, optlen);
 527                sockfd_put(sock);
 528        }
 529        return err;
 530}
 531
 532struct compat_group_req {
 533        __u32                            gr_interface;
 534        struct __kernel_sockaddr_storage gr_group
 535                __attribute__ ((aligned(4)));
 536} __attribute__ ((packed));
 537
 538struct compat_group_source_req {
 539        __u32                            gsr_interface;
 540        struct __kernel_sockaddr_storage gsr_group
 541                __attribute__ ((aligned(4)));
 542        struct __kernel_sockaddr_storage gsr_source
 543                __attribute__ ((aligned(4)));
 544} __attribute__ ((packed));
 545
 546struct compat_group_filter {
 547        __u32                            gf_interface;
 548        struct __kernel_sockaddr_storage gf_group
 549                __attribute__ ((aligned(4)));
 550        __u32                            gf_fmode;
 551        __u32                            gf_numsrc;
 552        struct __kernel_sockaddr_storage gf_slist[1]
 553                __attribute__ ((aligned(4)));
 554} __attribute__ ((packed));
 555
 556#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 557                        sizeof(struct __kernel_sockaddr_storage))
 558
 559
 560int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 561        char __user *optval, int optlen,
 562        int (*setsockopt)(struct sock *,int,int,char __user *,int))
 563{
 564        char __user     *koptval = optval;
 565        int             koptlen = optlen;
 566
 567        switch (optname) {
 568        case MCAST_JOIN_GROUP:
 569        case MCAST_LEAVE_GROUP:
 570        {
 571                struct compat_group_req __user *gr32 = (void *)optval;
 572                struct group_req __user *kgr =
 573                        compat_alloc_user_space(sizeof(struct group_req));
 574                u32 interface;
 575
 576                if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 577                    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 578                    __get_user(interface, &gr32->gr_interface) ||
 579                    __put_user(interface, &kgr->gr_interface) ||
 580                    copy_in_user(&kgr->gr_group, &gr32->gr_group,
 581                                sizeof(kgr->gr_group)))
 582                        return -EFAULT;
 583                koptval = (char __user *)kgr;
 584                koptlen = sizeof(struct group_req);
 585                break;
 586        }
 587        case MCAST_JOIN_SOURCE_GROUP:
 588        case MCAST_LEAVE_SOURCE_GROUP:
 589        case MCAST_BLOCK_SOURCE:
 590        case MCAST_UNBLOCK_SOURCE:
 591        {
 592                struct compat_group_source_req __user *gsr32 = (void *)optval;
 593                struct group_source_req __user *kgsr = compat_alloc_user_space(
 594                        sizeof(struct group_source_req));
 595                u32 interface;
 596
 597                if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 598                    !access_ok(VERIFY_WRITE, kgsr,
 599                        sizeof(struct group_source_req)) ||
 600                    __get_user(interface, &gsr32->gsr_interface) ||
 601                    __put_user(interface, &kgsr->gsr_interface) ||
 602                    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 603                                sizeof(kgsr->gsr_group)) ||
 604                    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 605                                sizeof(kgsr->gsr_source)))
 606                        return -EFAULT;
 607                koptval = (char __user *)kgsr;
 608                koptlen = sizeof(struct group_source_req);
 609                break;
 610        }
 611        case MCAST_MSFILTER:
 612        {
 613                struct compat_group_filter __user *gf32 = (void *)optval;
 614                struct group_filter __user *kgf;
 615                u32 interface, fmode, numsrc;
 616
 617                if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 618                    __get_user(interface, &gf32->gf_interface) ||
 619                    __get_user(fmode, &gf32->gf_fmode) ||
 620                    __get_user(numsrc, &gf32->gf_numsrc))
 621                        return -EFAULT;
 622                koptlen = optlen + sizeof(struct group_filter) -
 623                                sizeof(struct compat_group_filter);
 624                if (koptlen < GROUP_FILTER_SIZE(numsrc))
 625                        return -EINVAL;
 626                kgf = compat_alloc_user_space(koptlen);
 627                if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 628                    __put_user(interface, &kgf->gf_interface) ||
 629                    __put_user(fmode, &kgf->gf_fmode) ||
 630                    __put_user(numsrc, &kgf->gf_numsrc) ||
 631                    copy_in_user(&kgf->gf_group, &gf32->gf_group,
 632                                sizeof(kgf->gf_group)) ||
 633                    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 634                                numsrc * sizeof(kgf->gf_slist[0]))))
 635                        return -EFAULT;
 636                koptval = (char __user *)kgf;
 637                break;
 638        }
 639
 640        default:
 641                break;
 642        }
 643        return setsockopt(sock, level, optname, koptval, koptlen);
 644}
 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}
 724
 725EXPORT_SYMBOL(compat_mc_getsockopt);
 726
 727
 728/* Argument list sizes for compat_sys_socketcall */
 729#define AL(x) ((x) * sizeof(u32))
 730static unsigned char nas[19]={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)};
 734#undef AL
 735
 736asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 737{
 738        return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 739}
 740
 741asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 742{
 743        return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 744}
 745
 746asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 747{
 748        int ret;
 749        u32 a[6];
 750        u32 a0, a1;
 751
 752        if (call < SYS_SOCKET || call > SYS_ACCEPT4)
 753                return -EINVAL;
 754        if (copy_from_user(a, args, nas[call]))
 755                return -EFAULT;
 756        a0 = a[0];
 757        a1 = a[1];
 758
 759        switch (call) {
 760        case SYS_SOCKET:
 761                ret = sys_socket(a0, a1, a[2]);
 762                break;
 763        case SYS_BIND:
 764                ret = sys_bind(a0, compat_ptr(a1), a[2]);
 765                break;
 766        case SYS_CONNECT:
 767                ret = sys_connect(a0, compat_ptr(a1), a[2]);
 768                break;
 769        case SYS_LISTEN:
 770                ret = sys_listen(a0, a1);
 771                break;
 772        case SYS_ACCEPT:
 773                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 774                break;
 775        case SYS_GETSOCKNAME:
 776                ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 777                break;
 778        case SYS_GETPEERNAME:
 779                ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 780                break;
 781        case SYS_SOCKETPAIR:
 782                ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 783                break;
 784        case SYS_SEND:
 785                ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 786                break;
 787        case SYS_SENDTO:
 788                ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 789                break;
 790        case SYS_RECV:
 791                ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 792                break;
 793        case SYS_RECVFROM:
 794                ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
 795                break;
 796        case SYS_SHUTDOWN:
 797                ret = sys_shutdown(a0,a1);
 798                break;
 799        case SYS_SETSOCKOPT:
 800                ret = compat_sys_setsockopt(a0, a1, a[2],
 801                                compat_ptr(a[3]), a[4]);
 802                break;
 803        case SYS_GETSOCKOPT:
 804                ret = compat_sys_getsockopt(a0, a1, a[2],
 805                                compat_ptr(a[3]), compat_ptr(a[4]));
 806                break;
 807        case SYS_SENDMSG:
 808                ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 809                break;
 810        case SYS_RECVMSG:
 811                ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 812                break;
 813        case SYS_ACCEPT4:
 814                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 815                break;
 816        default:
 817                ret = -EINVAL;
 818                break;
 819        }
 820        return ret;
 821}
 822