linux/net/compat.c
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   1/*
   2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   3 *
   4 * Copyright (C) 2000           VA Linux Co
   5 * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   6 * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7 * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8 * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   9 * Copyright (C) 2000           Hewlett-Packard Co.
  10 * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11 * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/gfp.h>
  16#include <linux/fs.h>
  17#include <linux/types.h>
  18#include <linux/file.h>
  19#include <linux/icmpv6.h>
  20#include <linux/socket.h>
  21#include <linux/syscalls.h>
  22#include <linux/filter.h>
  23#include <linux/compat.h>
  24#include <linux/security.h>
  25#include <linux/export.h>
  26
  27#include <net/scm.h>
  28#include <net/sock.h>
  29#include <net/ip.h>
  30#include <net/ipv6.h>
  31#include <asm/uaccess.h>
  32#include <net/compat.h>
  33
  34static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  35                                          struct compat_iovec __user *uiov32,
  36                                          int niov)
  37{
  38        int tot_len = 0;
  39
  40        while (niov > 0) {
  41                compat_uptr_t buf;
  42                compat_size_t len;
  43
  44                if (get_user(len, &uiov32->iov_len) ||
  45                    get_user(buf, &uiov32->iov_base))
  46                        return -EFAULT;
  47
  48                if (len > INT_MAX - tot_len)
  49                        len = INT_MAX - tot_len;
  50
  51                tot_len += len;
  52                kiov->iov_base = compat_ptr(buf);
  53                kiov->iov_len = (__kernel_size_t) len;
  54                uiov32++;
  55                kiov++;
  56                niov--;
  57        }
  58        return tot_len;
  59}
  60
  61int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  62{
  63        compat_uptr_t tmp1, tmp2, tmp3;
  64
  65        if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  66            __get_user(tmp1, &umsg->msg_name) ||
  67            __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  68            __get_user(tmp2, &umsg->msg_iov) ||
  69            __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  70            __get_user(tmp3, &umsg->msg_control) ||
  71            __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  72            __get_user(kmsg->msg_flags, &umsg->msg_flags))
  73                return -EFAULT;
  74        if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  75                kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  76        kmsg->msg_name = compat_ptr(tmp1);
  77        kmsg->msg_iov = compat_ptr(tmp2);
  78        kmsg->msg_control = compat_ptr(tmp3);
  79        return 0;
  80}
  81
  82/* I've named the args so it is easy to tell whose space the pointers are in. */
  83int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  84                   struct sockaddr_storage *kern_address, int mode)
  85{
  86        int tot_len;
  87
  88        if (kern_msg->msg_name && kern_msg->msg_namelen) {
  89                if (mode == VERIFY_READ) {
  90                        int err = move_addr_to_kernel(kern_msg->msg_name,
  91                                                      kern_msg->msg_namelen,
  92                                                      kern_address);
  93                        if (err < 0)
  94                                return err;
  95                }
  96                kern_msg->msg_name = kern_address;
  97        } else {
  98                kern_msg->msg_name = NULL;
  99                kern_msg->msg_namelen = 0;
 100        }
 101
 102        tot_len = iov_from_user_compat_to_kern(kern_iov,
 103                                          (struct compat_iovec __user *)kern_msg->msg_iov,
 104                                          kern_msg->msg_iovlen);
 105        if (tot_len >= 0)
 106                kern_msg->msg_iov = kern_iov;
 107
 108        return tot_len;
 109}
 110
 111/* Bleech... */
 112#define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 113
 114#define CMSG_COMPAT_DATA(cmsg)                          \
 115        ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 116#define CMSG_COMPAT_SPACE(len)                          \
 117        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 118#define CMSG_COMPAT_LEN(len)                            \
 119        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 120
 121#define CMSG_COMPAT_FIRSTHDR(msg)                       \
 122        (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 123         (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 124         (struct compat_cmsghdr __user *)NULL)
 125
 126#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 127        ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 128         (ucmlen) <= (unsigned long) \
 129         ((mhdr)->msg_controllen - \
 130          ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 131
 132static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 133                struct compat_cmsghdr __user *cmsg, int cmsg_len)
 134{
 135        char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 136        if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 137                        msg->msg_controllen)
 138                return NULL;
 139        return (struct compat_cmsghdr __user *)ptr;
 140}
 141
 142/* There is a lot of hair here because the alignment rules (and
 143 * thus placement) of cmsg headers and length are different for
 144 * 32-bit apps.  -DaveM
 145 */
 146int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 147                               unsigned char *stackbuf, int stackbuf_size)
 148{
 149        struct compat_cmsghdr __user *ucmsg;
 150        struct cmsghdr *kcmsg, *kcmsg_base;
 151        compat_size_t ucmlen;
 152        __kernel_size_t kcmlen, tmp;
 153        int err = -EFAULT;
 154
 155        kcmlen = 0;
 156        kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 157        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 158        while (ucmsg != NULL) {
 159                if (get_user(ucmlen, &ucmsg->cmsg_len))
 160                        return -EFAULT;
 161
 162                /* Catch bogons. */
 163                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 164                        return -EINVAL;
 165
 166                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 167                       CMSG_ALIGN(sizeof(struct cmsghdr)));
 168                tmp = CMSG_ALIGN(tmp);
 169                kcmlen += tmp;
 170                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 171        }
 172        if (kcmlen == 0)
 173                return -EINVAL;
 174
 175        /* The kcmlen holds the 64-bit version of the control length.
 176         * It may not be modified as we do not stick it into the kmsg
 177         * until we have successfully copied over all of the data
 178         * from the user.
 179         */
 180        if (kcmlen > stackbuf_size)
 181                kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 182        if (kcmsg == NULL)
 183                return -ENOBUFS;
 184
 185        /* Now copy them over neatly. */
 186        memset(kcmsg, 0, kcmlen);
 187        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 188        while (ucmsg != NULL) {
 189                if (__get_user(ucmlen, &ucmsg->cmsg_len))
 190                        goto Efault;
 191                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 192                        goto Einval;
 193                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 194                       CMSG_ALIGN(sizeof(struct cmsghdr)));
 195                if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 196                        goto Einval;
 197                kcmsg->cmsg_len = tmp;
 198                tmp = CMSG_ALIGN(tmp);
 199                if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 200                    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 201                    copy_from_user(CMSG_DATA(kcmsg),
 202                                   CMSG_COMPAT_DATA(ucmsg),
 203                                   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 204                        goto Efault;
 205
 206                /* Advance. */
 207                kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 208                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 209        }
 210
 211        /* Ok, looks like we made it.  Hook it up and return success. */
 212        kmsg->msg_control = kcmsg_base;
 213        kmsg->msg_controllen = kcmlen;
 214        return 0;
 215
 216Einval:
 217        err = -EINVAL;
 218Efault:
 219        if (kcmsg_base != (struct cmsghdr *)stackbuf)
 220                sock_kfree_s(sk, kcmsg_base, kcmlen);
 221        return err;
 222}
 223
 224int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 225{
 226        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 227        struct compat_cmsghdr cmhdr;
 228        struct compat_timeval ctv;
 229        struct compat_timespec cts[3];
 230        int cmlen;
 231
 232        if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 233                kmsg->msg_flags |= MSG_CTRUNC;
 234                return 0; /* XXX: return error? check spec. */
 235        }
 236
 237        if (!COMPAT_USE_64BIT_TIME) {
 238                if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 239                        struct timeval *tv = (struct timeval *)data;
 240                        ctv.tv_sec = tv->tv_sec;
 241                        ctv.tv_usec = tv->tv_usec;
 242                        data = &ctv;
 243                        len = sizeof(ctv);
 244                }
 245                if (level == SOL_SOCKET &&
 246                    (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 247                        int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 248                        int i;
 249                        struct timespec *ts = (struct timespec *)data;
 250                        for (i = 0; i < count; i++) {
 251                                cts[i].tv_sec = ts[i].tv_sec;
 252                                cts[i].tv_nsec = ts[i].tv_nsec;
 253                        }
 254                        data = &cts;
 255                        len = sizeof(cts[0]) * count;
 256                }
 257        }
 258
 259        cmlen = CMSG_COMPAT_LEN(len);
 260        if (kmsg->msg_controllen < cmlen) {
 261                kmsg->msg_flags |= MSG_CTRUNC;
 262                cmlen = kmsg->msg_controllen;
 263        }
 264        cmhdr.cmsg_level = level;
 265        cmhdr.cmsg_type = type;
 266        cmhdr.cmsg_len = cmlen;
 267
 268        if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 269                return -EFAULT;
 270        if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 271                return -EFAULT;
 272        cmlen = CMSG_COMPAT_SPACE(len);
 273        if (kmsg->msg_controllen < cmlen)
 274                cmlen = kmsg->msg_controllen;
 275        kmsg->msg_control += cmlen;
 276        kmsg->msg_controllen -= cmlen;
 277        return 0;
 278}
 279
 280void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 281{
 282        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 283        int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 284        int fdnum = scm->fp->count;
 285        struct file **fp = scm->fp->fp;
 286        int __user *cmfptr;
 287        int err = 0, i;
 288
 289        if (fdnum < fdmax)
 290                fdmax = fdnum;
 291
 292        for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 293                int new_fd;
 294                err = security_file_receive(fp[i]);
 295                if (err)
 296                        break;
 297                err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 298                                          ? O_CLOEXEC : 0);
 299                if (err < 0)
 300                        break;
 301                new_fd = err;
 302                err = put_user(new_fd, cmfptr);
 303                if (err) {
 304                        put_unused_fd(new_fd);
 305                        break;
 306                }
 307                /* Bump the usage count and install the file. */
 308                fd_install(new_fd, get_file(fp[i]));
 309        }
 310
 311        if (i > 0) {
 312                int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 313                err = put_user(SOL_SOCKET, &cm->cmsg_level);
 314                if (!err)
 315                        err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 316                if (!err)
 317                        err = put_user(cmlen, &cm->cmsg_len);
 318                if (!err) {
 319                        cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 320                        kmsg->msg_control += cmlen;
 321                        kmsg->msg_controllen -= cmlen;
 322                }
 323        }
 324        if (i < fdnum)
 325                kmsg->msg_flags |= MSG_CTRUNC;
 326
 327        /*
 328         * All of the files that fit in the message have had their
 329         * usage counts incremented, so we just free the list.
 330         */
 331        __scm_destroy(scm);
 332}
 333
 334static int do_set_attach_filter(struct socket *sock, int level, int optname,
 335                                char __user *optval, unsigned int optlen)
 336{
 337        struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 338        struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 339        compat_uptr_t ptr;
 340        u16 len;
 341
 342        if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 343            !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 344            __get_user(len, &fprog32->len) ||
 345            __get_user(ptr, &fprog32->filter) ||
 346            __put_user(len, &kfprog->len) ||
 347            __put_user(compat_ptr(ptr), &kfprog->filter))
 348                return -EFAULT;
 349
 350        return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 351                              sizeof(struct sock_fprog));
 352}
 353
 354static int do_set_sock_timeout(struct socket *sock, int level,
 355                int optname, char __user *optval, unsigned int optlen)
 356{
 357        struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 358        struct timeval ktime;
 359        mm_segment_t old_fs;
 360        int err;
 361
 362        if (optlen < sizeof(*up))
 363                return -EINVAL;
 364        if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 365            __get_user(ktime.tv_sec, &up->tv_sec) ||
 366            __get_user(ktime.tv_usec, &up->tv_usec))
 367                return -EFAULT;
 368        old_fs = get_fs();
 369        set_fs(KERNEL_DS);
 370        err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 371        set_fs(old_fs);
 372
 373        return err;
 374}
 375
 376static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 377                                char __user *optval, unsigned int optlen)
 378{
 379        if (optname == SO_ATTACH_FILTER)
 380                return do_set_attach_filter(sock, level, optname,
 381                                            optval, optlen);
 382        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 383                return do_set_sock_timeout(sock, level, optname, optval, optlen);
 384
 385        return sock_setsockopt(sock, level, optname, optval, optlen);
 386}
 387
 388COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 389                       char __user *, optval, unsigned int, optlen)
 390{
 391        int err;
 392        struct socket *sock = sockfd_lookup(fd, &err);
 393
 394        if (sock) {
 395                err = security_socket_setsockopt(sock, level, optname);
 396                if (err) {
 397                        sockfd_put(sock);
 398                        return err;
 399                }
 400
 401                if (level == SOL_SOCKET)
 402                        err = compat_sock_setsockopt(sock, level,
 403                                        optname, optval, optlen);
 404                else if (sock->ops->compat_setsockopt)
 405                        err = sock->ops->compat_setsockopt(sock, level,
 406                                        optname, optval, optlen);
 407                else
 408                        err = sock->ops->setsockopt(sock, level,
 409                                        optname, optval, optlen);
 410                sockfd_put(sock);
 411        }
 412        return err;
 413}
 414
 415static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 416                char __user *optval, int __user *optlen)
 417{
 418        struct compat_timeval __user *up;
 419        struct timeval ktime;
 420        mm_segment_t old_fs;
 421        int len, err;
 422
 423        up = (struct compat_timeval __user *) optval;
 424        if (get_user(len, optlen))
 425                return -EFAULT;
 426        if (len < sizeof(*up))
 427                return -EINVAL;
 428        len = sizeof(ktime);
 429        old_fs = get_fs();
 430        set_fs(KERNEL_DS);
 431        err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 432        set_fs(old_fs);
 433
 434        if (!err) {
 435                if (put_user(sizeof(*up), optlen) ||
 436                    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 437                    __put_user(ktime.tv_sec, &up->tv_sec) ||
 438                    __put_user(ktime.tv_usec, &up->tv_usec))
 439                        err = -EFAULT;
 440        }
 441        return err;
 442}
 443
 444static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 445                                char __user *optval, int __user *optlen)
 446{
 447        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 448                return do_get_sock_timeout(sock, level, optname, optval, optlen);
 449        return sock_getsockopt(sock, level, optname, optval, optlen);
 450}
 451
 452int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 453{
 454        struct compat_timeval __user *ctv;
 455        int err;
 456        struct timeval tv;
 457
 458        if (COMPAT_USE_64BIT_TIME)
 459                return sock_get_timestamp(sk, userstamp);
 460
 461        ctv = (struct compat_timeval __user *) userstamp;
 462        err = -ENOENT;
 463        if (!sock_flag(sk, SOCK_TIMESTAMP))
 464                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 465        tv = ktime_to_timeval(sk->sk_stamp);
 466        if (tv.tv_sec == -1)
 467                return err;
 468        if (tv.tv_sec == 0) {
 469                sk->sk_stamp = ktime_get_real();
 470                tv = ktime_to_timeval(sk->sk_stamp);
 471        }
 472        err = 0;
 473        if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 474                        put_user(tv.tv_usec, &ctv->tv_usec))
 475                err = -EFAULT;
 476        return err;
 477}
 478EXPORT_SYMBOL(compat_sock_get_timestamp);
 479
 480int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 481{
 482        struct compat_timespec __user *ctv;
 483        int err;
 484        struct timespec ts;
 485
 486        if (COMPAT_USE_64BIT_TIME)
 487                return sock_get_timestampns (sk, userstamp);
 488
 489        ctv = (struct compat_timespec __user *) userstamp;
 490        err = -ENOENT;
 491        if (!sock_flag(sk, SOCK_TIMESTAMP))
 492                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 493        ts = ktime_to_timespec(sk->sk_stamp);
 494        if (ts.tv_sec == -1)
 495                return err;
 496        if (ts.tv_sec == 0) {
 497                sk->sk_stamp = ktime_get_real();
 498                ts = ktime_to_timespec(sk->sk_stamp);
 499        }
 500        err = 0;
 501        if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 502                        put_user(ts.tv_nsec, &ctv->tv_nsec))
 503                err = -EFAULT;
 504        return err;
 505}
 506EXPORT_SYMBOL(compat_sock_get_timestampns);
 507
 508COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 509                       char __user *, optval, int __user *, optlen)
 510{
 511        int err;
 512        struct socket *sock = sockfd_lookup(fd, &err);
 513
 514        if (sock) {
 515                err = security_socket_getsockopt(sock, level, optname);
 516                if (err) {
 517                        sockfd_put(sock);
 518                        return err;
 519                }
 520
 521                if (level == SOL_SOCKET)
 522                        err = compat_sock_getsockopt(sock, level,
 523                                        optname, optval, optlen);
 524                else if (sock->ops->compat_getsockopt)
 525                        err = sock->ops->compat_getsockopt(sock, level,
 526                                        optname, optval, optlen);
 527                else
 528                        err = sock->ops->getsockopt(sock, level,
 529                                        optname, optval, optlen);
 530                sockfd_put(sock);
 531        }
 532        return err;
 533}
 534
 535struct compat_group_req {
 536        __u32                            gr_interface;
 537        struct __kernel_sockaddr_storage gr_group
 538                __attribute__ ((aligned(4)));
 539} __packed;
 540
 541struct compat_group_source_req {
 542        __u32                            gsr_interface;
 543        struct __kernel_sockaddr_storage gsr_group
 544                __attribute__ ((aligned(4)));
 545        struct __kernel_sockaddr_storage gsr_source
 546                __attribute__ ((aligned(4)));
 547} __packed;
 548
 549struct compat_group_filter {
 550        __u32                            gf_interface;
 551        struct __kernel_sockaddr_storage gf_group
 552                __attribute__ ((aligned(4)));
 553        __u32                            gf_fmode;
 554        __u32                            gf_numsrc;
 555        struct __kernel_sockaddr_storage gf_slist[1]
 556                __attribute__ ((aligned(4)));
 557} __packed;
 558
 559#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 560                        sizeof(struct __kernel_sockaddr_storage))
 561
 562
 563int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 564        char __user *optval, unsigned int optlen,
 565        int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 566{
 567        char __user     *koptval = optval;
 568        int             koptlen = optlen;
 569
 570        switch (optname) {
 571        case MCAST_JOIN_GROUP:
 572        case MCAST_LEAVE_GROUP:
 573        {
 574                struct compat_group_req __user *gr32 = (void *)optval;
 575                struct group_req __user *kgr =
 576                        compat_alloc_user_space(sizeof(struct group_req));
 577                u32 interface;
 578
 579                if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 580                    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 581                    __get_user(interface, &gr32->gr_interface) ||
 582                    __put_user(interface, &kgr->gr_interface) ||
 583                    copy_in_user(&kgr->gr_group, &gr32->gr_group,
 584                                sizeof(kgr->gr_group)))
 585                        return -EFAULT;
 586                koptval = (char __user *)kgr;
 587                koptlen = sizeof(struct group_req);
 588                break;
 589        }
 590        case MCAST_JOIN_SOURCE_GROUP:
 591        case MCAST_LEAVE_SOURCE_GROUP:
 592        case MCAST_BLOCK_SOURCE:
 593        case MCAST_UNBLOCK_SOURCE:
 594        {
 595                struct compat_group_source_req __user *gsr32 = (void *)optval;
 596                struct group_source_req __user *kgsr = compat_alloc_user_space(
 597                        sizeof(struct group_source_req));
 598                u32 interface;
 599
 600                if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 601                    !access_ok(VERIFY_WRITE, kgsr,
 602                        sizeof(struct group_source_req)) ||
 603                    __get_user(interface, &gsr32->gsr_interface) ||
 604                    __put_user(interface, &kgsr->gsr_interface) ||
 605                    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 606                                sizeof(kgsr->gsr_group)) ||
 607                    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 608                                sizeof(kgsr->gsr_source)))
 609                        return -EFAULT;
 610                koptval = (char __user *)kgsr;
 611                koptlen = sizeof(struct group_source_req);
 612                break;
 613        }
 614        case MCAST_MSFILTER:
 615        {
 616                struct compat_group_filter __user *gf32 = (void *)optval;
 617                struct group_filter __user *kgf;
 618                u32 interface, fmode, numsrc;
 619
 620                if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 621                    __get_user(interface, &gf32->gf_interface) ||
 622                    __get_user(fmode, &gf32->gf_fmode) ||
 623                    __get_user(numsrc, &gf32->gf_numsrc))
 624                        return -EFAULT;
 625                koptlen = optlen + sizeof(struct group_filter) -
 626                                sizeof(struct compat_group_filter);
 627                if (koptlen < GROUP_FILTER_SIZE(numsrc))
 628                        return -EINVAL;
 629                kgf = compat_alloc_user_space(koptlen);
 630                if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 631                    __put_user(interface, &kgf->gf_interface) ||
 632                    __put_user(fmode, &kgf->gf_fmode) ||
 633                    __put_user(numsrc, &kgf->gf_numsrc) ||
 634                    copy_in_user(&kgf->gf_group, &gf32->gf_group,
 635                                sizeof(kgf->gf_group)) ||
 636                    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 637                                numsrc * sizeof(kgf->gf_slist[0]))))
 638                        return -EFAULT;
 639                koptval = (char __user *)kgf;
 640                break;
 641        }
 642
 643        default:
 644                break;
 645        }
 646        return setsockopt(sock, level, optname, koptval, koptlen);
 647}
 648EXPORT_SYMBOL(compat_mc_setsockopt);
 649
 650int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 651        char __user *optval, int __user *optlen,
 652        int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 653{
 654        struct compat_group_filter __user *gf32 = (void *)optval;
 655        struct group_filter __user *kgf;
 656        int __user      *koptlen;
 657        u32 interface, fmode, numsrc;
 658        int klen, ulen, err;
 659
 660        if (optname != MCAST_MSFILTER)
 661                return getsockopt(sock, level, optname, optval, optlen);
 662
 663        koptlen = compat_alloc_user_space(sizeof(*koptlen));
 664        if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 665            __get_user(ulen, optlen))
 666                return -EFAULT;
 667
 668        /* adjust len for pad */
 669        klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 670
 671        if (klen < GROUP_FILTER_SIZE(0))
 672                return -EINVAL;
 673
 674        if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 675            __put_user(klen, koptlen))
 676                return -EFAULT;
 677
 678        /* have to allow space for previous compat_alloc_user_space, too */
 679        kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 680
 681        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 682            __get_user(interface, &gf32->gf_interface) ||
 683            __get_user(fmode, &gf32->gf_fmode) ||
 684            __get_user(numsrc, &gf32->gf_numsrc) ||
 685            __put_user(interface, &kgf->gf_interface) ||
 686            __put_user(fmode, &kgf->gf_fmode) ||
 687            __put_user(numsrc, &kgf->gf_numsrc) ||
 688            copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 689                return -EFAULT;
 690
 691        err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 692        if (err)
 693                return err;
 694
 695        if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 696            __get_user(klen, koptlen))
 697                return -EFAULT;
 698
 699        ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 700
 701        if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 702            __put_user(ulen, optlen))
 703                return -EFAULT;
 704
 705        if (!access_ok(VERIFY_READ, kgf, klen) ||
 706            !access_ok(VERIFY_WRITE, gf32, ulen) ||
 707            __get_user(interface, &kgf->gf_interface) ||
 708            __get_user(fmode, &kgf->gf_fmode) ||
 709            __get_user(numsrc, &kgf->gf_numsrc) ||
 710            __put_user(interface, &gf32->gf_interface) ||
 711            __put_user(fmode, &gf32->gf_fmode) ||
 712            __put_user(numsrc, &gf32->gf_numsrc))
 713                return -EFAULT;
 714        if (numsrc) {
 715                int copylen;
 716
 717                klen -= GROUP_FILTER_SIZE(0);
 718                copylen = numsrc * sizeof(gf32->gf_slist[0]);
 719                if (copylen > klen)
 720                        copylen = klen;
 721                if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 722                        return -EFAULT;
 723        }
 724        return err;
 725}
 726EXPORT_SYMBOL(compat_mc_getsockopt);
 727
 728
 729/* Argument list sizes for compat_sys_socketcall */
 730#define AL(x) ((x) * sizeof(u32))
 731static unsigned char nas[21] = {
 732        AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 733        AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 734        AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 735        AL(4), AL(5), AL(4)
 736};
 737#undef AL
 738
 739COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 740{
 741        if (flags & MSG_CMSG_COMPAT)
 742                return -EINVAL;
 743        return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 744}
 745
 746COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 747                       unsigned int, vlen, unsigned int, flags)
 748{
 749        if (flags & MSG_CMSG_COMPAT)
 750                return -EINVAL;
 751        return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 752                              flags | MSG_CMSG_COMPAT);
 753}
 754
 755COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 756{
 757        if (flags & MSG_CMSG_COMPAT)
 758                return -EINVAL;
 759        return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 760}
 761
 762COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 763{
 764        return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 765}
 766
 767COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 768                       unsigned int, flags, struct sockaddr __user *, addr,
 769                       int __user *, addrlen)
 770{
 771        return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 772}
 773
 774COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 775                       unsigned int, vlen, unsigned int, flags,
 776                       struct compat_timespec __user *, timeout)
 777{
 778        int datagrams;
 779        struct timespec ktspec;
 780
 781        if (flags & MSG_CMSG_COMPAT)
 782                return -EINVAL;
 783
 784        if (timeout == NULL)
 785                return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 786                                      flags | MSG_CMSG_COMPAT, NULL);
 787
 788        if (compat_get_timespec(&ktspec, timeout))
 789                return -EFAULT;
 790
 791        datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 792                                   flags | MSG_CMSG_COMPAT, &ktspec);
 793        if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 794                datagrams = -EFAULT;
 795
 796        return datagrams;
 797}
 798
 799COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 800{
 801        int ret;
 802        u32 a[6];
 803        u32 a0, a1;
 804
 805        if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 806                return -EINVAL;
 807        if (copy_from_user(a, args, nas[call]))
 808                return -EFAULT;
 809        a0 = a[0];
 810        a1 = a[1];
 811
 812        switch (call) {
 813        case SYS_SOCKET:
 814                ret = sys_socket(a0, a1, a[2]);
 815                break;
 816        case SYS_BIND:
 817                ret = sys_bind(a0, compat_ptr(a1), a[2]);
 818                break;
 819        case SYS_CONNECT:
 820                ret = sys_connect(a0, compat_ptr(a1), a[2]);
 821                break;
 822        case SYS_LISTEN:
 823                ret = sys_listen(a0, a1);
 824                break;
 825        case SYS_ACCEPT:
 826                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 827                break;
 828        case SYS_GETSOCKNAME:
 829                ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 830                break;
 831        case SYS_GETPEERNAME:
 832                ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 833                break;
 834        case SYS_SOCKETPAIR:
 835                ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 836                break;
 837        case SYS_SEND:
 838                ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 839                break;
 840        case SYS_SENDTO:
 841                ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 842                break;
 843        case SYS_RECV:
 844                ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 845                break;
 846        case SYS_RECVFROM:
 847                ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 848                                          compat_ptr(a[4]), compat_ptr(a[5]));
 849                break;
 850        case SYS_SHUTDOWN:
 851                ret = sys_shutdown(a0, a1);
 852                break;
 853        case SYS_SETSOCKOPT:
 854                ret = compat_sys_setsockopt(a0, a1, a[2],
 855                                compat_ptr(a[3]), a[4]);
 856                break;
 857        case SYS_GETSOCKOPT:
 858                ret = compat_sys_getsockopt(a0, a1, a[2],
 859                                compat_ptr(a[3]), compat_ptr(a[4]));
 860                break;
 861        case SYS_SENDMSG:
 862                ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 863                break;
 864        case SYS_SENDMMSG:
 865                ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 866                break;
 867        case SYS_RECVMSG:
 868                ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 869                break;
 870        case SYS_RECVMMSG:
 871                ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 872                                          compat_ptr(a[4]));
 873                break;
 874        case SYS_ACCEPT4:
 875                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 876                break;
 877        default:
 878                ret = -EINVAL;
 879                break;
 880        }
 881        return ret;
 882}
 883
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