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;
 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 && type == SCM_TIMESTAMPNS) {
 237                struct timespec *ts = (struct timespec *)data;
 238                cts.tv_sec = ts->tv_sec;
 239                cts.tv_nsec = ts->tv_nsec;
 240                data = &cts;
 241                len = sizeof(cts);
 242        }
 243
 244        cmlen = CMSG_COMPAT_LEN(len);
 245        if (kmsg->msg_controllen < cmlen) {
 246                kmsg->msg_flags |= MSG_CTRUNC;
 247                cmlen = kmsg->msg_controllen;
 248        }
 249        cmhdr.cmsg_level = level;
 250        cmhdr.cmsg_type = type;
 251        cmhdr.cmsg_len = cmlen;
 252
 253        if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 254                return -EFAULT;
 255        if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 256                return -EFAULT;
 257        cmlen = CMSG_COMPAT_SPACE(len);
 258        if (kmsg->msg_controllen < cmlen)
 259                cmlen = kmsg->msg_controllen;
 260        kmsg->msg_control += cmlen;
 261        kmsg->msg_controllen -= cmlen;
 262        return 0;
 263}
 264
 265void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 266{
 267        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 268        int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 269        int fdnum = scm->fp->count;
 270        struct file **fp = scm->fp->fp;
 271        int __user *cmfptr;
 272        int err = 0, i;
 273
 274        if (fdnum < fdmax)
 275                fdmax = fdnum;
 276
 277        for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 278                int new_fd;
 279                err = security_file_receive(fp[i]);
 280                if (err)
 281                        break;
 282                err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 283                                          ? O_CLOEXEC : 0);
 284                if (err < 0)
 285                        break;
 286                new_fd = err;
 287                err = put_user(new_fd, cmfptr);
 288                if (err) {
 289                        put_unused_fd(new_fd);
 290                        break;
 291                }
 292                /* Bump the usage count and install the file. */
 293                get_file(fp[i]);
 294                fd_install(new_fd, fp[i]);
 295        }
 296
 297        if (i > 0) {
 298                int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 299                err = put_user(SOL_SOCKET, &cm->cmsg_level);
 300                if (!err)
 301                        err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 302                if (!err)
 303                        err = put_user(cmlen, &cm->cmsg_len);
 304                if (!err) {
 305                        cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 306                        kmsg->msg_control += cmlen;
 307                        kmsg->msg_controllen -= cmlen;
 308                }
 309        }
 310        if (i < fdnum)
 311                kmsg->msg_flags |= MSG_CTRUNC;
 312
 313        /*
 314         * All of the files that fit in the message have had their
 315         * usage counts incremented, so we just free the list.
 316         */
 317        __scm_destroy(scm);
 318}
 319
 320/*
 321 * A struct sock_filter is architecture independent.
 322 */
 323struct compat_sock_fprog {
 324        u16             len;
 325        compat_uptr_t   filter;         /* struct sock_filter * */
 326};
 327
 328static int do_set_attach_filter(struct socket *sock, int level, int optname,
 329                                char __user *optval, int optlen)
 330{
 331        struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 332        struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 333        compat_uptr_t ptr;
 334        u16 len;
 335
 336        if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 337            !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 338            __get_user(len, &fprog32->len) ||
 339            __get_user(ptr, &fprog32->filter) ||
 340            __put_user(len, &kfprog->len) ||
 341            __put_user(compat_ptr(ptr), &kfprog->filter))
 342                return -EFAULT;
 343
 344        return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 345                              sizeof(struct sock_fprog));
 346}
 347
 348static int do_set_sock_timeout(struct socket *sock, int level,
 349                int optname, char __user *optval, int optlen)
 350{
 351        struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
 352        struct timeval ktime;
 353        mm_segment_t old_fs;
 354        int err;
 355
 356        if (optlen < sizeof(*up))
 357                return -EINVAL;
 358        if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 359            __get_user(ktime.tv_sec, &up->tv_sec) ||
 360            __get_user(ktime.tv_usec, &up->tv_usec))
 361                return -EFAULT;
 362        old_fs = get_fs();
 363        set_fs(KERNEL_DS);
 364        err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
 365        set_fs(old_fs);
 366
 367        return err;
 368}
 369
 370static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 371                                char __user *optval, int optlen)
 372{
 373        if (optname == SO_ATTACH_FILTER)
 374                return do_set_attach_filter(sock, level, optname,
 375                                            optval, optlen);
 376        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 377                return do_set_sock_timeout(sock, level, optname, optval, optlen);
 378
 379        return sock_setsockopt(sock, level, optname, optval, optlen);
 380}
 381
 382asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 383                                char __user *optval, int optlen)
 384{
 385        int err;
 386        struct socket *sock;
 387
 388        if (optlen < 0)
 389                return -EINVAL;
 390
 391        if ((sock = sockfd_lookup(fd, &err))!=NULL)
 392        {
 393                err = security_socket_setsockopt(sock,level,optname);
 394                if (err) {
 395                        sockfd_put(sock);
 396                        return err;
 397                }
 398
 399                if (level == SOL_SOCKET)
 400                        err = compat_sock_setsockopt(sock, level,
 401                                        optname, optval, optlen);
 402                else if (sock->ops->compat_setsockopt)
 403                        err = sock->ops->compat_setsockopt(sock, level,
 404                                        optname, optval, optlen);
 405                else
 406                        err = sock->ops->setsockopt(sock, level,
 407                                        optname, optval, optlen);
 408                sockfd_put(sock);
 409        }
 410        return err;
 411}
 412
 413static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 414                char __user *optval, int __user *optlen)
 415{
 416        struct compat_timeval __user *up;
 417        struct timeval ktime;
 418        mm_segment_t old_fs;
 419        int len, err;
 420
 421        up = (struct compat_timeval __user *) optval;
 422        if (get_user(len, optlen))
 423                return -EFAULT;
 424        if (len < sizeof(*up))
 425                return -EINVAL;
 426        len = sizeof(ktime);
 427        old_fs = get_fs();
 428        set_fs(KERNEL_DS);
 429        err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 430        set_fs(old_fs);
 431
 432        if (!err) {
 433                if (put_user(sizeof(*up), optlen) ||
 434                    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 435                    __put_user(ktime.tv_sec, &up->tv_sec) ||
 436                    __put_user(ktime.tv_usec, &up->tv_usec))
 437                        err = -EFAULT;
 438        }
 439        return err;
 440}
 441
 442static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 443                                char __user *optval, int __user *optlen)
 444{
 445        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 446                return do_get_sock_timeout(sock, level, optname, optval, optlen);
 447        return sock_getsockopt(sock, level, optname, optval, optlen);
 448}
 449
 450int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 451{
 452        struct compat_timeval __user *ctv =
 453                        (struct compat_timeval __user*) userstamp;
 454        int err = -ENOENT;
 455        struct timeval tv;
 456
 457        if (!sock_flag(sk, SOCK_TIMESTAMP))
 458                sock_enable_timestamp(sk);
 459        tv = ktime_to_timeval(sk->sk_stamp);
 460        if (tv.tv_sec == -1)
 461                return err;
 462        if (tv.tv_sec == 0) {
 463                sk->sk_stamp = ktime_get_real();
 464                tv = ktime_to_timeval(sk->sk_stamp);
 465        }
 466        err = 0;
 467        if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 468                        put_user(tv.tv_usec, &ctv->tv_usec))
 469                err = -EFAULT;
 470        return err;
 471}
 472EXPORT_SYMBOL(compat_sock_get_timestamp);
 473
 474int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 475{
 476        struct compat_timespec __user *ctv =
 477                        (struct compat_timespec __user*) userstamp;
 478        int err = -ENOENT;
 479        struct timespec ts;
 480
 481        if (!sock_flag(sk, SOCK_TIMESTAMP))
 482                sock_enable_timestamp(sk);
 483        ts = ktime_to_timespec(sk->sk_stamp);
 484        if (ts.tv_sec == -1)
 485                return err;
 486        if (ts.tv_sec == 0) {
 487                sk->sk_stamp = ktime_get_real();
 488                ts = ktime_to_timespec(sk->sk_stamp);
 489        }
 490        err = 0;
 491        if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 492                        put_user(ts.tv_nsec, &ctv->tv_nsec))
 493                err = -EFAULT;
 494        return err;
 495}
 496EXPORT_SYMBOL(compat_sock_get_timestampns);
 497
 498asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 499                                char __user *optval, int __user *optlen)
 500{
 501        int err;
 502        struct socket *sock;
 503
 504        if ((sock = sockfd_lookup(fd, &err))!=NULL)
 505        {
 506                err = security_socket_getsockopt(sock, level,
 507                                                           optname);
 508                if (err) {
 509                        sockfd_put(sock);
 510                        return err;
 511                }
 512
 513                if (level == SOL_SOCKET)
 514                        err = compat_sock_getsockopt(sock, level,
 515                                        optname, optval, optlen);
 516                else if (sock->ops->compat_getsockopt)
 517                        err = sock->ops->compat_getsockopt(sock, level,
 518                                        optname, optval, optlen);
 519                else
 520                        err = sock->ops->getsockopt(sock, level,
 521                                        optname, optval, optlen);
 522                sockfd_put(sock);
 523        }
 524        return err;
 525}
 526
 527struct compat_group_req {
 528        __u32                            gr_interface;
 529        struct __kernel_sockaddr_storage gr_group
 530                __attribute__ ((aligned(4)));
 531} __attribute__ ((packed));
 532
 533struct compat_group_source_req {
 534        __u32                            gsr_interface;
 535        struct __kernel_sockaddr_storage gsr_group
 536                __attribute__ ((aligned(4)));
 537        struct __kernel_sockaddr_storage gsr_source
 538                __attribute__ ((aligned(4)));
 539} __attribute__ ((packed));
 540
 541struct compat_group_filter {
 542        __u32                            gf_interface;
 543        struct __kernel_sockaddr_storage gf_group
 544                __attribute__ ((aligned(4)));
 545        __u32                            gf_fmode;
 546        __u32                            gf_numsrc;
 547        struct __kernel_sockaddr_storage gf_slist[1]
 548                __attribute__ ((aligned(4)));
 549} __attribute__ ((packed));
 550
 551#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 552                        sizeof(struct __kernel_sockaddr_storage))
 553
 554
 555int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 556        char __user *optval, int optlen,
 557        int (*setsockopt)(struct sock *,int,int,char __user *,int))
 558{
 559        char __user     *koptval = optval;
 560        int             koptlen = optlen;
 561
 562        switch (optname) {
 563        case MCAST_JOIN_GROUP:
 564        case MCAST_LEAVE_GROUP:
 565        {
 566                struct compat_group_req __user *gr32 = (void *)optval;
 567                struct group_req __user *kgr =
 568                        compat_alloc_user_space(sizeof(struct group_req));
 569                u32 interface;
 570
 571                if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 572                    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 573                    __get_user(interface, &gr32->gr_interface) ||
 574                    __put_user(interface, &kgr->gr_interface) ||
 575                    copy_in_user(&kgr->gr_group, &gr32->gr_group,
 576                                sizeof(kgr->gr_group)))
 577                        return -EFAULT;
 578                koptval = (char __user *)kgr;
 579                koptlen = sizeof(struct group_req);
 580                break;
 581        }
 582        case MCAST_JOIN_SOURCE_GROUP:
 583        case MCAST_LEAVE_SOURCE_GROUP:
 584        case MCAST_BLOCK_SOURCE:
 585        case MCAST_UNBLOCK_SOURCE:
 586        {
 587                struct compat_group_source_req __user *gsr32 = (void *)optval;
 588                struct group_source_req __user *kgsr = compat_alloc_user_space(
 589                        sizeof(struct group_source_req));
 590                u32 interface;
 591
 592                if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 593                    !access_ok(VERIFY_WRITE, kgsr,
 594                        sizeof(struct group_source_req)) ||
 595                    __get_user(interface, &gsr32->gsr_interface) ||
 596                    __put_user(interface, &kgsr->gsr_interface) ||
 597                    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 598                                sizeof(kgsr->gsr_group)) ||
 599                    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 600                                sizeof(kgsr->gsr_source)))
 601                        return -EFAULT;
 602                koptval = (char __user *)kgsr;
 603                koptlen = sizeof(struct group_source_req);
 604                break;
 605        }
 606        case MCAST_MSFILTER:
 607        {
 608                struct compat_group_filter __user *gf32 = (void *)optval;
 609                struct group_filter __user *kgf;
 610                u32 interface, fmode, numsrc;
 611
 612                if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 613                    __get_user(interface, &gf32->gf_interface) ||
 614                    __get_user(fmode, &gf32->gf_fmode) ||
 615                    __get_user(numsrc, &gf32->gf_numsrc))
 616                        return -EFAULT;
 617                koptlen = optlen + sizeof(struct group_filter) -
 618                                sizeof(struct compat_group_filter);
 619                if (koptlen < GROUP_FILTER_SIZE(numsrc))
 620                        return -EINVAL;
 621                kgf = compat_alloc_user_space(koptlen);
 622                if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 623                    __put_user(interface, &kgf->gf_interface) ||
 624                    __put_user(fmode, &kgf->gf_fmode) ||
 625                    __put_user(numsrc, &kgf->gf_numsrc) ||
 626                    copy_in_user(&kgf->gf_group, &gf32->gf_group,
 627                                sizeof(kgf->gf_group)) ||
 628                    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 629                                numsrc * sizeof(kgf->gf_slist[0]))))
 630                        return -EFAULT;
 631                koptval = (char __user *)kgf;
 632                break;
 633        }
 634
 635        default:
 636                break;
 637        }
 638        return setsockopt(sock, level, optname, koptval, koptlen);
 639}
 640
 641EXPORT_SYMBOL(compat_mc_setsockopt);
 642
 643int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 644        char __user *optval, int __user *optlen,
 645        int (*getsockopt)(struct sock *,int,int,char __user *,int __user *))
 646{
 647        struct compat_group_filter __user *gf32 = (void *)optval;
 648        struct group_filter __user *kgf;
 649        int __user      *koptlen;
 650        u32 interface, fmode, numsrc;
 651        int klen, ulen, err;
 652
 653        if (optname != MCAST_MSFILTER)
 654                return getsockopt(sock, level, optname, optval, optlen);
 655
 656        koptlen = compat_alloc_user_space(sizeof(*koptlen));
 657        if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 658            __get_user(ulen, optlen))
 659                return -EFAULT;
 660
 661        /* adjust len for pad */
 662        klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 663
 664        if (klen < GROUP_FILTER_SIZE(0))
 665                return -EINVAL;
 666
 667        if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 668            __put_user(klen, koptlen))
 669                return -EFAULT;
 670
 671        /* have to allow space for previous compat_alloc_user_space, too */
 672        kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 673
 674        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 675            __get_user(interface, &gf32->gf_interface) ||
 676            __get_user(fmode, &gf32->gf_fmode) ||
 677            __get_user(numsrc, &gf32->gf_numsrc) ||
 678            __put_user(interface, &kgf->gf_interface) ||
 679            __put_user(fmode, &kgf->gf_fmode) ||
 680            __put_user(numsrc, &kgf->gf_numsrc) ||
 681            copy_in_user(&kgf->gf_group,&gf32->gf_group,sizeof(kgf->gf_group)))
 682                return -EFAULT;
 683
 684        err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 685        if (err)
 686                return err;
 687
 688        if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 689            __get_user(klen, koptlen))
 690                return -EFAULT;
 691
 692        ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 693
 694        if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 695            __put_user(ulen, optlen))
 696                return -EFAULT;
 697
 698        if (!access_ok(VERIFY_READ, kgf, klen) ||
 699            !access_ok(VERIFY_WRITE, gf32, ulen) ||
 700            __get_user(interface, &kgf->gf_interface) ||
 701            __get_user(fmode, &kgf->gf_fmode) ||
 702            __get_user(numsrc, &kgf->gf_numsrc) ||
 703            __put_user(interface, &gf32->gf_interface) ||
 704            __put_user(fmode, &gf32->gf_fmode) ||
 705            __put_user(numsrc, &gf32->gf_numsrc))
 706                return -EFAULT;
 707        if (numsrc) {
 708                int copylen;
 709
 710                klen -= GROUP_FILTER_SIZE(0);
 711                copylen = numsrc * sizeof(gf32->gf_slist[0]);
 712                if (copylen > klen)
 713                        copylen = klen;
 714                if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 715                        return -EFAULT;
 716        }
 717        return err;
 718}
 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[19]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
 726                                AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
 727                                AL(6),AL(2),AL(5),AL(5),AL(3),AL(3),
 728                                AL(4)};
 729#undef AL
 730
 731asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 732{
 733        return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 734}
 735
 736asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 737{
 738        return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 739}
 740
 741asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 742{
 743        int ret;
 744        u32 a[6];
 745        u32 a0, a1;
 746
 747        if (call < SYS_SOCKET || call > SYS_ACCEPT4)
 748                return -EINVAL;
 749        if (copy_from_user(a, args, nas[call]))
 750                return -EFAULT;
 751        a0 = a[0];
 752        a1 = a[1];
 753
 754        switch (call) {
 755        case SYS_SOCKET:
 756                ret = sys_socket(a0, a1, a[2]);
 757                break;
 758        case SYS_BIND:
 759                ret = sys_bind(a0, compat_ptr(a1), a[2]);
 760                break;
 761        case SYS_CONNECT:
 762                ret = sys_connect(a0, compat_ptr(a1), a[2]);
 763                break;
 764        case SYS_LISTEN:
 765                ret = sys_listen(a0, a1);
 766                break;
 767        case SYS_ACCEPT:
 768                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 769                break;
 770        case SYS_GETSOCKNAME:
 771                ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 772                break;
 773        case SYS_GETPEERNAME:
 774                ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 775                break;
 776        case SYS_SOCKETPAIR:
 777                ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 778                break;
 779        case SYS_SEND:
 780                ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 781                break;
 782        case SYS_SENDTO:
 783                ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 784                break;
 785        case SYS_RECV:
 786                ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 787                break;
 788        case SYS_RECVFROM:
 789                ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
 790                break;
 791        case SYS_SHUTDOWN:
 792                ret = sys_shutdown(a0,a1);
 793                break;
 794        case SYS_SETSOCKOPT:
 795                ret = compat_sys_setsockopt(a0, a1, a[2],
 796                                compat_ptr(a[3]), a[4]);
 797                break;
 798        case SYS_GETSOCKOPT:
 799                ret = compat_sys_getsockopt(a0, a1, a[2],
 800                                compat_ptr(a[3]), compat_ptr(a[4]));
 801                break;
 802        case SYS_SENDMSG:
 803                ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 804                break;
 805        case SYS_RECVMSG:
 806                ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 807                break;
 808        case SYS_ACCEPT4:
 809                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 810                break;
 811        default:
 812                ret = -EINVAL;
 813                break;
 814        }
 815        return ret;
 816}
 817