linux/net/compat.c
<<
>>
Prefs
   1/*
   2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   3 *
   4 * Copyright (C) 2000           VA Linux Co
   5 * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   6 * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7 * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8 * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   9 * Copyright (C) 2000           Hewlett-Packard Co.
  10 * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11 * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/gfp.h>
  16#include <linux/fs.h>
  17#include <linux/types.h>
  18#include <linux/file.h>
  19#include <linux/icmpv6.h>
  20#include <linux/socket.h>
  21#include <linux/syscalls.h>
  22#include <linux/filter.h>
  23#include <linux/compat.h>
  24#include <linux/security.h>
  25#include <linux/export.h>
  26
  27#include <net/scm.h>
  28#include <net/sock.h>
  29#include <net/ip.h>
  30#include <net/ipv6.h>
  31#include <asm/uaccess.h>
  32#include <net/compat.h>
  33
  34static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  35                                          struct compat_iovec __user *uiov32,
  36                                          int niov)
  37{
  38        int tot_len = 0;
  39
  40        while (niov > 0) {
  41                compat_uptr_t buf;
  42                compat_size_t len;
  43
  44                if (get_user(len, &uiov32->iov_len) ||
  45                    get_user(buf, &uiov32->iov_base))
  46                        return -EFAULT;
  47
  48                if (len > INT_MAX - tot_len)
  49                        len = INT_MAX - tot_len;
  50
  51                tot_len += len;
  52                kiov->iov_base = compat_ptr(buf);
  53                kiov->iov_len = (__kernel_size_t) len;
  54                uiov32++;
  55                kiov++;
  56                niov--;
  57        }
  58        return tot_len;
  59}
  60
  61int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  62{
  63        compat_uptr_t tmp1, tmp2, tmp3;
  64
  65        if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  66            __get_user(tmp1, &umsg->msg_name) ||
  67            __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  68            __get_user(tmp2, &umsg->msg_iov) ||
  69            __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  70            __get_user(tmp3, &umsg->msg_control) ||
  71            __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  72            __get_user(kmsg->msg_flags, &umsg->msg_flags))
  73                return -EFAULT;
  74        kmsg->msg_name = compat_ptr(tmp1);
  75        kmsg->msg_iov = compat_ptr(tmp2);
  76        kmsg->msg_control = compat_ptr(tmp3);
  77        return 0;
  78}
  79
  80/* I've named the args so it is easy to tell whose space the pointers are in. */
  81int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  82                   struct sockaddr *kern_address, int mode)
  83{
  84        int tot_len;
  85
  86        if (kern_msg->msg_namelen) {
  87                if (mode == VERIFY_READ) {
  88                        int err = move_addr_to_kernel(kern_msg->msg_name,
  89                                                      kern_msg->msg_namelen,
  90                                                      kern_address);
  91                        if (err < 0)
  92                                return err;
  93                }
  94                kern_msg->msg_name = kern_address;
  95        } else
  96                kern_msg->msg_name = NULL;
  97
  98        tot_len = iov_from_user_compat_to_kern(kern_iov,
  99                                          (struct compat_iovec __user *)kern_msg->msg_iov,
 100                                          kern_msg->msg_iovlen);
 101        if (tot_len >= 0)
 102                kern_msg->msg_iov = kern_iov;
 103
 104        return tot_len;
 105}
 106
 107/* Bleech... */
 108#define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 109
 110#define CMSG_COMPAT_DATA(cmsg)                          \
 111        ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 112#define CMSG_COMPAT_SPACE(len)                          \
 113        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 114#define CMSG_COMPAT_LEN(len)                            \
 115        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 116
 117#define CMSG_COMPAT_FIRSTHDR(msg)                       \
 118        (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 119         (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 120         (struct compat_cmsghdr __user *)NULL)
 121
 122#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 123        ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 124         (ucmlen) <= (unsigned long) \
 125         ((mhdr)->msg_controllen - \
 126          ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 127
 128static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 129                struct compat_cmsghdr __user *cmsg, int cmsg_len)
 130{
 131        char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 132        if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 133                        msg->msg_controllen)
 134                return NULL;
 135        return (struct compat_cmsghdr __user *)ptr;
 136}
 137
 138/* There is a lot of hair here because the alignment rules (and
 139 * thus placement) of cmsg headers and length are different for
 140 * 32-bit apps.  -DaveM
 141 */
 142int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 143                               unsigned char *stackbuf, int stackbuf_size)
 144{
 145        struct compat_cmsghdr __user *ucmsg;
 146        struct cmsghdr *kcmsg, *kcmsg_base;
 147        compat_size_t ucmlen;
 148        __kernel_size_t kcmlen, tmp;
 149        int err = -EFAULT;
 150
 151        kcmlen = 0;
 152        kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 153        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 154        while (ucmsg != NULL) {
 155                if (get_user(ucmlen, &ucmsg->cmsg_len))
 156                        return -EFAULT;
 157
 158                /* Catch bogons. */
 159                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 160                        return -EINVAL;
 161
 162                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 163                       CMSG_ALIGN(sizeof(struct cmsghdr)));
 164                tmp = CMSG_ALIGN(tmp);
 165                kcmlen += tmp;
 166                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 167        }
 168        if (kcmlen == 0)
 169                return -EINVAL;
 170
 171        /* The kcmlen holds the 64-bit version of the control length.
 172         * It may not be modified as we do not stick it into the kmsg
 173         * until we have successfully copied over all of the data
 174         * from the user.
 175         */
 176        if (kcmlen > stackbuf_size)
 177                kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 178        if (kcmsg == NULL)
 179                return -ENOBUFS;
 180
 181        /* Now copy them over neatly. */
 182        memset(kcmsg, 0, kcmlen);
 183        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 184        while (ucmsg != NULL) {
 185                if (__get_user(ucmlen, &ucmsg->cmsg_len))
 186                        goto Efault;
 187                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 188                        goto Einval;
 189                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 190                       CMSG_ALIGN(sizeof(struct cmsghdr)));
 191                if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 192                        goto Einval;
 193                kcmsg->cmsg_len = tmp;
 194                tmp = CMSG_ALIGN(tmp);
 195                if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 196                    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 197                    copy_from_user(CMSG_DATA(kcmsg),
 198                                   CMSG_COMPAT_DATA(ucmsg),
 199                                   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 200                        goto Efault;
 201
 202                /* Advance. */
 203                kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 204                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 205        }
 206
 207        /* Ok, looks like we made it.  Hook it up and return success. */
 208        kmsg->msg_control = kcmsg_base;
 209        kmsg->msg_controllen = kcmlen;
 210        return 0;
 211
 212Einval:
 213        err = -EINVAL;
 214Efault:
 215        if (kcmsg_base != (struct cmsghdr *)stackbuf)
 216                sock_kfree_s(sk, kcmsg_base, kcmlen);
 217        return err;
 218}
 219
 220int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 221{
 222        struct compat_timeval ctv;
 223        struct compat_timespec cts[3];
 224        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 225        struct compat_cmsghdr cmhdr;
 226        int cmlen;
 227
 228        if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 229                kmsg->msg_flags |= MSG_CTRUNC;
 230                return 0; /* XXX: return error? check spec. */
 231        }
 232
 233        if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 234                struct timeval *tv = (struct timeval *)data;
 235                ctv.tv_sec = tv->tv_sec;
 236                ctv.tv_usec = tv->tv_usec;
 237                data = &ctv;
 238                len = sizeof(ctv);
 239        }
 240        if (level == SOL_SOCKET &&
 241            (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 242                int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 243                int i;
 244                struct timespec *ts = (struct timespec *)data;
 245                for (i = 0; i < count; i++) {
 246                        cts[i].tv_sec = ts[i].tv_sec;
 247                        cts[i].tv_nsec = ts[i].tv_nsec;
 248                }
 249                data = &cts;
 250                len = sizeof(cts[0]) * count;
 251        }
 252
 253        cmlen = CMSG_COMPAT_LEN(len);
 254        if (kmsg->msg_controllen < cmlen) {
 255                kmsg->msg_flags |= MSG_CTRUNC;
 256                cmlen = kmsg->msg_controllen;
 257        }
 258        cmhdr.cmsg_level = level;
 259        cmhdr.cmsg_type = type;
 260        cmhdr.cmsg_len = cmlen;
 261
 262        if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 263                return -EFAULT;
 264        if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 265                return -EFAULT;
 266        cmlen = CMSG_COMPAT_SPACE(len);
 267        if (kmsg->msg_controllen < cmlen)
 268                cmlen = kmsg->msg_controllen;
 269        kmsg->msg_control += cmlen;
 270        kmsg->msg_controllen -= cmlen;
 271        return 0;
 272}
 273
 274void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 275{
 276        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 277        int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 278        int fdnum = scm->fp->count;
 279        struct file **fp = scm->fp->fp;
 280        int __user *cmfptr;
 281        int err = 0, i;
 282
 283        if (fdnum < fdmax)
 284                fdmax = fdnum;
 285
 286        for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 287                int new_fd;
 288                err = security_file_receive(fp[i]);
 289                if (err)
 290                        break;
 291                err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 292                                          ? O_CLOEXEC : 0);
 293                if (err < 0)
 294                        break;
 295                new_fd = err;
 296                err = put_user(new_fd, cmfptr);
 297                if (err) {
 298                        put_unused_fd(new_fd);
 299                        break;
 300                }
 301                /* Bump the usage count and install the file. */
 302                get_file(fp[i]);
 303                fd_install(new_fd, fp[i]);
 304        }
 305
 306        if (i > 0) {
 307                int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 308                err = put_user(SOL_SOCKET, &cm->cmsg_level);
 309                if (!err)
 310                        err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 311                if (!err)
 312                        err = put_user(cmlen, &cm->cmsg_len);
 313                if (!err) {
 314                        cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 315                        kmsg->msg_control += cmlen;
 316                        kmsg->msg_controllen -= cmlen;
 317                }
 318        }
 319        if (i < fdnum)
 320                kmsg->msg_flags |= MSG_CTRUNC;
 321
 322        /*
 323         * All of the files that fit in the message have had their
 324         * usage counts incremented, so we just free the list.
 325         */
 326        __scm_destroy(scm);
 327}
 328
 329/*
 330 * A struct sock_filter is architecture independent.
 331 */
 332struct compat_sock_fprog {
 333        u16             len;
 334        compat_uptr_t   filter;         /* struct sock_filter * */
 335};
 336
 337static int do_set_attach_filter(struct socket *sock, int level, int optname,
 338                                char __user *optval, unsigned int optlen)
 339{
 340        struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 341        struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 342        compat_uptr_t ptr;
 343        u16 len;
 344
 345        if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 346            !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 347            __get_user(len, &fprog32->len) ||
 348            __get_user(ptr, &fprog32->filter) ||
 349            __put_user(len, &kfprog->len) ||
 350            __put_user(compat_ptr(ptr), &kfprog->filter))
 351                return -EFAULT;
 352
 353        return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 354                              sizeof(struct sock_fprog));
 355}
 356
 357static int do_set_sock_timeout(struct socket *sock, int level,
 358                int optname, char __user *optval, unsigned int optlen)
 359{
 360        struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 361        struct timeval ktime;
 362        mm_segment_t old_fs;
 363        int err;
 364
 365        if (optlen < sizeof(*up))
 366                return -EINVAL;
 367        if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 368            __get_user(ktime.tv_sec, &up->tv_sec) ||
 369            __get_user(ktime.tv_usec, &up->tv_usec))
 370                return -EFAULT;
 371        old_fs = get_fs();
 372        set_fs(KERNEL_DS);
 373        err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 374        set_fs(old_fs);
 375
 376        return err;
 377}
 378
 379static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 380                                char __user *optval, unsigned int optlen)
 381{
 382        if (optname == SO_ATTACH_FILTER)
 383                return do_set_attach_filter(sock, level, optname,
 384                                            optval, optlen);
 385        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 386                return do_set_sock_timeout(sock, level, optname, optval, optlen);
 387
 388        return sock_setsockopt(sock, level, optname, optval, optlen);
 389}
 390
 391asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 392                                char __user *optval, unsigned int optlen)
 393{
 394        int err;
 395        struct socket *sock = sockfd_lookup(fd, &err);
 396
 397        if (sock) {
 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 = sockfd_lookup(fd, &err);
 508
 509        if (sock) {
 510                err = security_socket_getsockopt(sock, level, optname);
 511                if (err) {
 512                        sockfd_put(sock);
 513                        return err;
 514                }
 515
 516                if (level == SOL_SOCKET)
 517                        err = compat_sock_getsockopt(sock, level,
 518                                        optname, optval, optlen);
 519                else if (sock->ops->compat_getsockopt)
 520                        err = sock->ops->compat_getsockopt(sock, level,
 521                                        optname, optval, optlen);
 522                else
 523                        err = sock->ops->getsockopt(sock, level,
 524                                        optname, optval, optlen);
 525                sockfd_put(sock);
 526        }
 527        return err;
 528}
 529
 530struct compat_group_req {
 531        __u32                            gr_interface;
 532        struct __kernel_sockaddr_storage gr_group
 533                __attribute__ ((aligned(4)));
 534} __packed;
 535
 536struct compat_group_source_req {
 537        __u32                            gsr_interface;
 538        struct __kernel_sockaddr_storage gsr_group
 539                __attribute__ ((aligned(4)));
 540        struct __kernel_sockaddr_storage gsr_source
 541                __attribute__ ((aligned(4)));
 542} __packed;
 543
 544struct compat_group_filter {
 545        __u32                            gf_interface;
 546        struct __kernel_sockaddr_storage gf_group
 547                __attribute__ ((aligned(4)));
 548        __u32                            gf_fmode;
 549        __u32                            gf_numsrc;
 550        struct __kernel_sockaddr_storage gf_slist[1]
 551                __attribute__ ((aligned(4)));
 552} __packed;
 553
 554#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 555                        sizeof(struct __kernel_sockaddr_storage))
 556
 557
 558int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 559        char __user *optval, unsigned int optlen,
 560        int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 561{
 562        char __user     *koptval = optval;
 563        int             koptlen = optlen;
 564
 565        switch (optname) {
 566        case MCAST_JOIN_GROUP:
 567        case MCAST_LEAVE_GROUP:
 568        {
 569                struct compat_group_req __user *gr32 = (void *)optval;
 570                struct group_req __user *kgr =
 571                        compat_alloc_user_space(sizeof(struct group_req));
 572                u32 interface;
 573
 574                if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 575                    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 576                    __get_user(interface, &gr32->gr_interface) ||
 577                    __put_user(interface, &kgr->gr_interface) ||
 578                    copy_in_user(&kgr->gr_group, &gr32->gr_group,
 579                                sizeof(kgr->gr_group)))
 580                        return -EFAULT;
 581                koptval = (char __user *)kgr;
 582                koptlen = sizeof(struct group_req);
 583                break;
 584        }
 585        case MCAST_JOIN_SOURCE_GROUP:
 586        case MCAST_LEAVE_SOURCE_GROUP:
 587        case MCAST_BLOCK_SOURCE:
 588        case MCAST_UNBLOCK_SOURCE:
 589        {
 590                struct compat_group_source_req __user *gsr32 = (void *)optval;
 591                struct group_source_req __user *kgsr = compat_alloc_user_space(
 592                        sizeof(struct group_source_req));
 593                u32 interface;
 594
 595                if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 596                    !access_ok(VERIFY_WRITE, kgsr,
 597                        sizeof(struct group_source_req)) ||
 598                    __get_user(interface, &gsr32->gsr_interface) ||
 599                    __put_user(interface, &kgsr->gsr_interface) ||
 600                    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 601                                sizeof(kgsr->gsr_group)) ||
 602                    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 603                                sizeof(kgsr->gsr_source)))
 604                        return -EFAULT;
 605                koptval = (char __user *)kgsr;
 606                koptlen = sizeof(struct group_source_req);
 607                break;
 608        }
 609        case MCAST_MSFILTER:
 610        {
 611                struct compat_group_filter __user *gf32 = (void *)optval;
 612                struct group_filter __user *kgf;
 613                u32 interface, fmode, numsrc;
 614
 615                if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 616                    __get_user(interface, &gf32->gf_interface) ||
 617                    __get_user(fmode, &gf32->gf_fmode) ||
 618                    __get_user(numsrc, &gf32->gf_numsrc))
 619                        return -EFAULT;
 620                koptlen = optlen + sizeof(struct group_filter) -
 621                                sizeof(struct compat_group_filter);
 622                if (koptlen < GROUP_FILTER_SIZE(numsrc))
 623                        return -EINVAL;
 624                kgf = compat_alloc_user_space(koptlen);
 625                if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 626                    __put_user(interface, &kgf->gf_interface) ||
 627                    __put_user(fmode, &kgf->gf_fmode) ||
 628                    __put_user(numsrc, &kgf->gf_numsrc) ||
 629                    copy_in_user(&kgf->gf_group, &gf32->gf_group,
 630                                sizeof(kgf->gf_group)) ||
 631                    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 632                                numsrc * sizeof(kgf->gf_slist[0]))))
 633                        return -EFAULT;
 634                koptval = (char __user *)kgf;
 635                break;
 636        }
 637
 638        default:
 639                break;
 640        }
 641        return setsockopt(sock, level, optname, koptval, koptlen);
 642}
 643EXPORT_SYMBOL(compat_mc_setsockopt);
 644
 645int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 646        char __user *optval, int __user *optlen,
 647        int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 648{
 649        struct compat_group_filter __user *gf32 = (void *)optval;
 650        struct group_filter __user *kgf;
 651        int __user      *koptlen;
 652        u32 interface, fmode, numsrc;
 653        int klen, ulen, err;
 654
 655        if (optname != MCAST_MSFILTER)
 656                return getsockopt(sock, level, optname, optval, optlen);
 657
 658        koptlen = compat_alloc_user_space(sizeof(*koptlen));
 659        if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 660            __get_user(ulen, optlen))
 661                return -EFAULT;
 662
 663        /* adjust len for pad */
 664        klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 665
 666        if (klen < GROUP_FILTER_SIZE(0))
 667                return -EINVAL;
 668
 669        if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 670            __put_user(klen, koptlen))
 671                return -EFAULT;
 672
 673        /* have to allow space for previous compat_alloc_user_space, too */
 674        kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 675
 676        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 677            __get_user(interface, &gf32->gf_interface) ||
 678            __get_user(fmode, &gf32->gf_fmode) ||
 679            __get_user(numsrc, &gf32->gf_numsrc) ||
 680            __put_user(interface, &kgf->gf_interface) ||
 681            __put_user(fmode, &kgf->gf_fmode) ||
 682            __put_user(numsrc, &kgf->gf_numsrc) ||
 683            copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 684                return -EFAULT;
 685
 686        err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 687        if (err)
 688                return err;
 689
 690        if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 691            __get_user(klen, koptlen))
 692                return -EFAULT;
 693
 694        ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 695
 696        if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 697            __put_user(ulen, optlen))
 698                return -EFAULT;
 699
 700        if (!access_ok(VERIFY_READ, kgf, klen) ||
 701            !access_ok(VERIFY_WRITE, gf32, ulen) ||
 702            __get_user(interface, &kgf->gf_interface) ||
 703            __get_user(fmode, &kgf->gf_fmode) ||
 704            __get_user(numsrc, &kgf->gf_numsrc) ||
 705            __put_user(interface, &gf32->gf_interface) ||
 706            __put_user(fmode, &gf32->gf_fmode) ||
 707            __put_user(numsrc, &gf32->gf_numsrc))
 708                return -EFAULT;
 709        if (numsrc) {
 710                int copylen;
 711
 712                klen -= GROUP_FILTER_SIZE(0);
 713                copylen = numsrc * sizeof(gf32->gf_slist[0]);
 714                if (copylen > klen)
 715                        copylen = klen;
 716                if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 717                        return -EFAULT;
 718        }
 719        return err;
 720}
 721EXPORT_SYMBOL(compat_mc_getsockopt);
 722
 723
 724/* Argument list sizes for compat_sys_socketcall */
 725#define AL(x) ((x) * sizeof(u32))
 726static unsigned char nas[21] = {
 727        AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 728        AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 729        AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 730        AL(4), AL(5), AL(4)
 731};
 732#undef AL
 733
 734asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 735{
 736        return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 737}
 738
 739asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 740                                    unsigned vlen, unsigned int flags)
 741{
 742        return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 743                              flags | MSG_CMSG_COMPAT);
 744}
 745
 746asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 747{
 748        return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 749}
 750
 751asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags)
 752{
 753        return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 754}
 755
 756asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
 757                                    unsigned flags, struct sockaddr __user *addr,
 758                                    int __user *addrlen)
 759{
 760        return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 761}
 762
 763asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 764                                    unsigned vlen, unsigned int flags,
 765                                    struct compat_timespec __user *timeout)
 766{
 767        int datagrams;
 768        struct timespec ktspec;
 769
 770        if (timeout == NULL)
 771                return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 772                                      flags | MSG_CMSG_COMPAT, NULL);
 773
 774        if (get_compat_timespec(&ktspec, timeout))
 775                return -EFAULT;
 776
 777        datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 778                                   flags | MSG_CMSG_COMPAT, &ktspec);
 779        if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
 780                datagrams = -EFAULT;
 781
 782        return datagrams;
 783}
 784
 785asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 786{
 787        int ret;
 788        u32 a[6];
 789        u32 a0, a1;
 790
 791        if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 792                return -EINVAL;
 793        if (copy_from_user(a, args, nas[call]))
 794                return -EFAULT;
 795        a0 = a[0];
 796        a1 = a[1];
 797
 798        switch (call) {
 799        case SYS_SOCKET:
 800                ret = sys_socket(a0, a1, a[2]);
 801                break;
 802        case SYS_BIND:
 803                ret = sys_bind(a0, compat_ptr(a1), a[2]);
 804                break;
 805        case SYS_CONNECT:
 806                ret = sys_connect(a0, compat_ptr(a1), a[2]);
 807                break;
 808        case SYS_LISTEN:
 809                ret = sys_listen(a0, a1);
 810                break;
 811        case SYS_ACCEPT:
 812                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 813                break;
 814        case SYS_GETSOCKNAME:
 815                ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 816                break;
 817        case SYS_GETPEERNAME:
 818                ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 819                break;
 820        case SYS_SOCKETPAIR:
 821                ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 822                break;
 823        case SYS_SEND:
 824                ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 825                break;
 826        case SYS_SENDTO:
 827                ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 828                break;
 829        case SYS_RECV:
 830                ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 831                break;
 832        case SYS_RECVFROM:
 833                ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 834                                          compat_ptr(a[4]), compat_ptr(a[5]));
 835                break;
 836        case SYS_SHUTDOWN:
 837                ret = sys_shutdown(a0, a1);
 838                break;
 839        case SYS_SETSOCKOPT:
 840                ret = compat_sys_setsockopt(a0, a1, a[2],
 841                                compat_ptr(a[3]), a[4]);
 842                break;
 843        case SYS_GETSOCKOPT:
 844                ret = compat_sys_getsockopt(a0, a1, a[2],
 845                                compat_ptr(a[3]), compat_ptr(a[4]));
 846                break;
 847        case SYS_SENDMSG:
 848                ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 849                break;
 850        case SYS_SENDMMSG:
 851                ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 852                break;
 853        case SYS_RECVMSG:
 854                ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 855                break;
 856        case SYS_RECVMMSG:
 857                ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 858                                          compat_ptr(a[4]));
 859                break;
 860        case SYS_ACCEPT4:
 861                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 862                break;
 863        default:
 864                ret = -EINVAL;
 865                break;
 866        }
 867        return ret;
 868}
 869