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                return -EINVAL;
  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_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
 100        tot_len = iov_from_user_compat_to_kern(kern_iov,
 101                                          (struct compat_iovec __user *)kern_msg->msg_iov,
 102                                          kern_msg->msg_iovlen);
 103        if (tot_len >= 0)
 104                kern_msg->msg_iov = kern_iov;
 105
 106        return tot_len;
 107}
 108
 109/* Bleech... */
 110#define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 111
 112#define CMSG_COMPAT_DATA(cmsg)                          \
 113        ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 114#define CMSG_COMPAT_SPACE(len)                          \
 115        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 116#define CMSG_COMPAT_LEN(len)                            \
 117        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 118
 119#define CMSG_COMPAT_FIRSTHDR(msg)                       \
 120        (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 121         (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 122         (struct compat_cmsghdr __user *)NULL)
 123
 124#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 125        ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 126         (ucmlen) <= (unsigned long) \
 127         ((mhdr)->msg_controllen - \
 128          ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 129
 130static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 131                struct compat_cmsghdr __user *cmsg, int cmsg_len)
 132{
 133        char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 134        if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 135                        msg->msg_controllen)
 136                return NULL;
 137        return (struct compat_cmsghdr __user *)ptr;
 138}
 139
 140/* There is a lot of hair here because the alignment rules (and
 141 * thus placement) of cmsg headers and length are different for
 142 * 32-bit apps.  -DaveM
 143 */
 144int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 145                               unsigned char *stackbuf, int stackbuf_size)
 146{
 147        struct compat_cmsghdr __user *ucmsg;
 148        struct cmsghdr *kcmsg, *kcmsg_base;
 149        compat_size_t ucmlen;
 150        __kernel_size_t kcmlen, tmp;
 151        int err = -EFAULT;
 152
 153        kcmlen = 0;
 154        kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 155        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 156        while (ucmsg != NULL) {
 157                if (get_user(ucmlen, &ucmsg->cmsg_len))
 158                        return -EFAULT;
 159
 160                /* Catch bogons. */
 161                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 162                        return -EINVAL;
 163
 164                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 165                       CMSG_ALIGN(sizeof(struct cmsghdr)));
 166                tmp = CMSG_ALIGN(tmp);
 167                kcmlen += tmp;
 168                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 169        }
 170        if (kcmlen == 0)
 171                return -EINVAL;
 172
 173        /* The kcmlen holds the 64-bit version of the control length.
 174         * It may not be modified as we do not stick it into the kmsg
 175         * until we have successfully copied over all of the data
 176         * from the user.
 177         */
 178        if (kcmlen > stackbuf_size)
 179                kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 180        if (kcmsg == NULL)
 181                return -ENOBUFS;
 182
 183        /* Now copy them over neatly. */
 184        memset(kcmsg, 0, kcmlen);
 185        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 186        while (ucmsg != NULL) {
 187                if (__get_user(ucmlen, &ucmsg->cmsg_len))
 188                        goto Efault;
 189                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 190                        goto Einval;
 191                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 192                       CMSG_ALIGN(sizeof(struct cmsghdr)));
 193                if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 194                        goto Einval;
 195                kcmsg->cmsg_len = tmp;
 196                tmp = CMSG_ALIGN(tmp);
 197                if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 198                    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 199                    copy_from_user(CMSG_DATA(kcmsg),
 200                                   CMSG_COMPAT_DATA(ucmsg),
 201                                   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 202                        goto Efault;
 203
 204                /* Advance. */
 205                kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 206                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 207        }
 208
 209        /* Ok, looks like we made it.  Hook it up and return success. */
 210        kmsg->msg_control = kcmsg_base;
 211        kmsg->msg_controllen = kcmlen;
 212        return 0;
 213
 214Einval:
 215        err = -EINVAL;
 216Efault:
 217        if (kcmsg_base != (struct cmsghdr *)stackbuf)
 218                sock_kfree_s(sk, kcmsg_base, kcmlen);
 219        return err;
 220}
 221
 222int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 223{
 224        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 225        struct compat_cmsghdr cmhdr;
 226        struct compat_timeval ctv;
 227        struct compat_timespec cts[3];
 228        int cmlen;
 229
 230        if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 231                kmsg->msg_flags |= MSG_CTRUNC;
 232                return 0; /* XXX: return error? check spec. */
 233        }
 234
 235        if (!COMPAT_USE_64BIT_TIME) {
 236                if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 237                        struct timeval *tv = (struct timeval *)data;
 238                        ctv.tv_sec = tv->tv_sec;
 239                        ctv.tv_usec = tv->tv_usec;
 240                        data = &ctv;
 241                        len = sizeof(ctv);
 242                }
 243                if (level == SOL_SOCKET &&
 244                    (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 245                        int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 246                        int i;
 247                        struct timespec *ts = (struct timespec *)data;
 248                        for (i = 0; i < count; i++) {
 249                                cts[i].tv_sec = ts[i].tv_sec;
 250                                cts[i].tv_nsec = ts[i].tv_nsec;
 251                        }
 252                        data = &cts;
 253                        len = sizeof(cts[0]) * count;
 254                }
 255        }
 256
 257        cmlen = CMSG_COMPAT_LEN(len);
 258        if (kmsg->msg_controllen < cmlen) {
 259                kmsg->msg_flags |= MSG_CTRUNC;
 260                cmlen = kmsg->msg_controllen;
 261        }
 262        cmhdr.cmsg_level = level;
 263        cmhdr.cmsg_type = type;
 264        cmhdr.cmsg_len = cmlen;
 265
 266        if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 267                return -EFAULT;
 268        if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 269                return -EFAULT;
 270        cmlen = CMSG_COMPAT_SPACE(len);
 271        if (kmsg->msg_controllen < cmlen)
 272                cmlen = kmsg->msg_controllen;
 273        kmsg->msg_control += cmlen;
 274        kmsg->msg_controllen -= cmlen;
 275        return 0;
 276}
 277
 278void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 279{
 280        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 281        int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 282        int fdnum = scm->fp->count;
 283        struct file **fp = scm->fp->fp;
 284        int __user *cmfptr;
 285        int err = 0, i;
 286
 287        if (fdnum < fdmax)
 288                fdmax = fdnum;
 289
 290        for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 291                int new_fd;
 292                err = security_file_receive(fp[i]);
 293                if (err)
 294                        break;
 295                err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 296                                          ? O_CLOEXEC : 0);
 297                if (err < 0)
 298                        break;
 299                new_fd = err;
 300                err = put_user(new_fd, cmfptr);
 301                if (err) {
 302                        put_unused_fd(new_fd);
 303                        break;
 304                }
 305                /* Bump the usage count and install the file. */
 306                fd_install(new_fd, get_file(fp[i]));
 307        }
 308
 309        if (i > 0) {
 310                int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 311                err = put_user(SOL_SOCKET, &cm->cmsg_level);
 312                if (!err)
 313                        err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 314                if (!err)
 315                        err = put_user(cmlen, &cm->cmsg_len);
 316                if (!err) {
 317                        cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 318                        kmsg->msg_control += cmlen;
 319                        kmsg->msg_controllen -= cmlen;
 320                }
 321        }
 322        if (i < fdnum)
 323                kmsg->msg_flags |= MSG_CTRUNC;
 324
 325        /*
 326         * All of the files that fit in the message have had their
 327         * usage counts incremented, so we just free the list.
 328         */
 329        __scm_destroy(scm);
 330}
 331
 332static int do_set_attach_filter(struct socket *sock, int level, int optname,
 333                                char __user *optval, unsigned int optlen)
 334{
 335        struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 336        struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 337        compat_uptr_t ptr;
 338        u16 len;
 339
 340        if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 341            !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 342            __get_user(len, &fprog32->len) ||
 343            __get_user(ptr, &fprog32->filter) ||
 344            __put_user(len, &kfprog->len) ||
 345            __put_user(compat_ptr(ptr), &kfprog->filter))
 346                return -EFAULT;
 347
 348        return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 349                              sizeof(struct sock_fprog));
 350}
 351
 352static int do_set_sock_timeout(struct socket *sock, int level,
 353                int optname, char __user *optval, unsigned int optlen)
 354{
 355        struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 356        struct timeval ktime;
 357        mm_segment_t old_fs;
 358        int err;
 359
 360        if (optlen < sizeof(*up))
 361                return -EINVAL;
 362        if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 363            __get_user(ktime.tv_sec, &up->tv_sec) ||
 364            __get_user(ktime.tv_usec, &up->tv_usec))
 365                return -EFAULT;
 366        old_fs = get_fs();
 367        set_fs(KERNEL_DS);
 368        err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 369        set_fs(old_fs);
 370
 371        return err;
 372}
 373
 374static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 375                                char __user *optval, unsigned int optlen)
 376{
 377        if (optname == SO_ATTACH_FILTER)
 378                return do_set_attach_filter(sock, level, optname,
 379                                            optval, optlen);
 380        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 381                return do_set_sock_timeout(sock, level, optname, optval, optlen);
 382
 383        return sock_setsockopt(sock, level, optname, optval, optlen);
 384}
 385
 386asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 387                                char __user *optval, unsigned int optlen)
 388{
 389        int err;
 390        struct socket *sock = sockfd_lookup(fd, &err);
 391
 392        if (sock) {
 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        int err;
 454        struct timeval tv;
 455
 456        if (COMPAT_USE_64BIT_TIME)
 457                return sock_get_timestamp(sk, userstamp);
 458
 459        ctv = (struct compat_timeval __user *) userstamp;
 460        err = -ENOENT;
 461        if (!sock_flag(sk, SOCK_TIMESTAMP))
 462                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 463        tv = ktime_to_timeval(sk->sk_stamp);
 464        if (tv.tv_sec == -1)
 465                return err;
 466        if (tv.tv_sec == 0) {
 467                sk->sk_stamp = ktime_get_real();
 468                tv = ktime_to_timeval(sk->sk_stamp);
 469        }
 470        err = 0;
 471        if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 472                        put_user(tv.tv_usec, &ctv->tv_usec))
 473                err = -EFAULT;
 474        return err;
 475}
 476EXPORT_SYMBOL(compat_sock_get_timestamp);
 477
 478int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 479{
 480        struct compat_timespec __user *ctv;
 481        int err;
 482        struct timespec ts;
 483
 484        if (COMPAT_USE_64BIT_TIME)
 485                return sock_get_timestampns (sk, userstamp);
 486
 487        ctv = (struct compat_timespec __user *) userstamp;
 488        err = -ENOENT;
 489        if (!sock_flag(sk, SOCK_TIMESTAMP))
 490                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 491        ts = ktime_to_timespec(sk->sk_stamp);
 492        if (ts.tv_sec == -1)
 493                return err;
 494        if (ts.tv_sec == 0) {
 495                sk->sk_stamp = ktime_get_real();
 496                ts = ktime_to_timespec(sk->sk_stamp);
 497        }
 498        err = 0;
 499        if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 500                        put_user(ts.tv_nsec, &ctv->tv_nsec))
 501                err = -EFAULT;
 502        return err;
 503}
 504EXPORT_SYMBOL(compat_sock_get_timestampns);
 505
 506asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 507                                char __user *optval, int __user *optlen)
 508{
 509        int err;
 510        struct socket *sock = sockfd_lookup(fd, &err);
 511
 512        if (sock) {
 513                err = security_socket_getsockopt(sock, level, optname);
 514                if (err) {
 515                        sockfd_put(sock);
 516                        return err;
 517                }
 518
 519                if (level == SOL_SOCKET)
 520                        err = compat_sock_getsockopt(sock, level,
 521                                        optname, optval, optlen);
 522                else if (sock->ops->compat_getsockopt)
 523                        err = sock->ops->compat_getsockopt(sock, level,
 524                                        optname, optval, optlen);
 525                else
 526                        err = sock->ops->getsockopt(sock, level,
 527                                        optname, optval, optlen);
 528                sockfd_put(sock);
 529        }
 530        return err;
 531}
 532
 533struct compat_group_req {
 534        __u32                            gr_interface;
 535        struct __kernel_sockaddr_storage gr_group
 536                __attribute__ ((aligned(4)));
 537} __packed;
 538
 539struct compat_group_source_req {
 540        __u32                            gsr_interface;
 541        struct __kernel_sockaddr_storage gsr_group
 542                __attribute__ ((aligned(4)));
 543        struct __kernel_sockaddr_storage gsr_source
 544                __attribute__ ((aligned(4)));
 545} __packed;
 546
 547struct compat_group_filter {
 548        __u32                            gf_interface;
 549        struct __kernel_sockaddr_storage gf_group
 550                __attribute__ ((aligned(4)));
 551        __u32                            gf_fmode;
 552        __u32                            gf_numsrc;
 553        struct __kernel_sockaddr_storage gf_slist[1]
 554                __attribute__ ((aligned(4)));
 555} __packed;
 556
 557#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 558                        sizeof(struct __kernel_sockaddr_storage))
 559
 560
 561int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 562        char __user *optval, unsigned int optlen,
 563        int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 564{
 565        char __user     *koptval = optval;
 566        int             koptlen = optlen;
 567
 568        switch (optname) {
 569        case MCAST_JOIN_GROUP:
 570        case MCAST_LEAVE_GROUP:
 571        {
 572                struct compat_group_req __user *gr32 = (void *)optval;
 573                struct group_req __user *kgr =
 574                        compat_alloc_user_space(sizeof(struct group_req));
 575                u32 interface;
 576
 577                if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 578                    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 579                    __get_user(interface, &gr32->gr_interface) ||
 580                    __put_user(interface, &kgr->gr_interface) ||
 581                    copy_in_user(&kgr->gr_group, &gr32->gr_group,
 582                                sizeof(kgr->gr_group)))
 583                        return -EFAULT;
 584                koptval = (char __user *)kgr;
 585                koptlen = sizeof(struct group_req);
 586                break;
 587        }
 588        case MCAST_JOIN_SOURCE_GROUP:
 589        case MCAST_LEAVE_SOURCE_GROUP:
 590        case MCAST_BLOCK_SOURCE:
 591        case MCAST_UNBLOCK_SOURCE:
 592        {
 593                struct compat_group_source_req __user *gsr32 = (void *)optval;
 594                struct group_source_req __user *kgsr = compat_alloc_user_space(
 595                        sizeof(struct group_source_req));
 596                u32 interface;
 597
 598                if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 599                    !access_ok(VERIFY_WRITE, kgsr,
 600                        sizeof(struct group_source_req)) ||
 601                    __get_user(interface, &gsr32->gsr_interface) ||
 602                    __put_user(interface, &kgsr->gsr_interface) ||
 603                    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 604                                sizeof(kgsr->gsr_group)) ||
 605                    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 606                                sizeof(kgsr->gsr_source)))
 607                        return -EFAULT;
 608                koptval = (char __user *)kgsr;
 609                koptlen = sizeof(struct group_source_req);
 610                break;
 611        }
 612        case MCAST_MSFILTER:
 613        {
 614                struct compat_group_filter __user *gf32 = (void *)optval;
 615                struct group_filter __user *kgf;
 616                u32 interface, fmode, numsrc;
 617
 618                if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 619                    __get_user(interface, &gf32->gf_interface) ||
 620                    __get_user(fmode, &gf32->gf_fmode) ||
 621                    __get_user(numsrc, &gf32->gf_numsrc))
 622                        return -EFAULT;
 623                koptlen = optlen + sizeof(struct group_filter) -
 624                                sizeof(struct compat_group_filter);
 625                if (koptlen < GROUP_FILTER_SIZE(numsrc))
 626                        return -EINVAL;
 627                kgf = compat_alloc_user_space(koptlen);
 628                if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 629                    __put_user(interface, &kgf->gf_interface) ||
 630                    __put_user(fmode, &kgf->gf_fmode) ||
 631                    __put_user(numsrc, &kgf->gf_numsrc) ||
 632                    copy_in_user(&kgf->gf_group, &gf32->gf_group,
 633                                sizeof(kgf->gf_group)) ||
 634                    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 635                                numsrc * sizeof(kgf->gf_slist[0]))))
 636                        return -EFAULT;
 637                koptval = (char __user *)kgf;
 638                break;
 639        }
 640
 641        default:
 642                break;
 643        }
 644        return setsockopt(sock, level, optname, koptval, koptlen);
 645}
 646EXPORT_SYMBOL(compat_mc_setsockopt);
 647
 648int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 649        char __user *optval, int __user *optlen,
 650        int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 651{
 652        struct compat_group_filter __user *gf32 = (void *)optval;
 653        struct group_filter __user *kgf;
 654        int __user      *koptlen;
 655        u32 interface, fmode, numsrc;
 656        int klen, ulen, err;
 657
 658        if (optname != MCAST_MSFILTER)
 659                return getsockopt(sock, level, optname, optval, optlen);
 660
 661        koptlen = compat_alloc_user_space(sizeof(*koptlen));
 662        if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 663            __get_user(ulen, optlen))
 664                return -EFAULT;
 665
 666        /* adjust len for pad */
 667        klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 668
 669        if (klen < GROUP_FILTER_SIZE(0))
 670                return -EINVAL;
 671
 672        if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 673            __put_user(klen, koptlen))
 674                return -EFAULT;
 675
 676        /* have to allow space for previous compat_alloc_user_space, too */
 677        kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 678
 679        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 680            __get_user(interface, &gf32->gf_interface) ||
 681            __get_user(fmode, &gf32->gf_fmode) ||
 682            __get_user(numsrc, &gf32->gf_numsrc) ||
 683            __put_user(interface, &kgf->gf_interface) ||
 684            __put_user(fmode, &kgf->gf_fmode) ||
 685            __put_user(numsrc, &kgf->gf_numsrc) ||
 686            copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 687                return -EFAULT;
 688
 689        err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 690        if (err)
 691                return err;
 692
 693        if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 694            __get_user(klen, koptlen))
 695                return -EFAULT;
 696
 697        ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 698
 699        if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 700            __put_user(ulen, optlen))
 701                return -EFAULT;
 702
 703        if (!access_ok(VERIFY_READ, kgf, klen) ||
 704            !access_ok(VERIFY_WRITE, gf32, ulen) ||
 705            __get_user(interface, &kgf->gf_interface) ||
 706            __get_user(fmode, &kgf->gf_fmode) ||
 707            __get_user(numsrc, &kgf->gf_numsrc) ||
 708            __put_user(interface, &gf32->gf_interface) ||
 709            __put_user(fmode, &gf32->gf_fmode) ||
 710            __put_user(numsrc, &gf32->gf_numsrc))
 711                return -EFAULT;
 712        if (numsrc) {
 713                int copylen;
 714
 715                klen -= GROUP_FILTER_SIZE(0);
 716                copylen = numsrc * sizeof(gf32->gf_slist[0]);
 717                if (copylen > klen)
 718                        copylen = klen;
 719                if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 720                        return -EFAULT;
 721        }
 722        return err;
 723}
 724EXPORT_SYMBOL(compat_mc_getsockopt);
 725
 726
 727/* Argument list sizes for compat_sys_socketcall */
 728#define AL(x) ((x) * sizeof(u32))
 729static unsigned char nas[21] = {
 730        AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 731        AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 732        AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 733        AL(4), AL(5), AL(4)
 734};
 735#undef AL
 736
 737asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 738{
 739        if (flags & MSG_CMSG_COMPAT)
 740                return -EINVAL;
 741        return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 742}
 743
 744asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 745                                    unsigned int vlen, unsigned int flags)
 746{
 747        if (flags & MSG_CMSG_COMPAT)
 748                return -EINVAL;
 749        return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 750                              flags | MSG_CMSG_COMPAT);
 751}
 752
 753asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 754{
 755        if (flags & MSG_CMSG_COMPAT)
 756                return -EINVAL;
 757        return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 758}
 759
 760asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
 761{
 762        return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 763}
 764
 765asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
 766                                    unsigned int flags, struct sockaddr __user *addr,
 767                                    int __user *addrlen)
 768{
 769        return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 770}
 771
 772asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 773                                    unsigned int vlen, unsigned int flags,
 774                                    struct compat_timespec __user *timeout)
 775{
 776        int datagrams;
 777        struct timespec ktspec;
 778
 779        if (flags & MSG_CMSG_COMPAT)
 780                return -EINVAL;
 781
 782        if (COMPAT_USE_64BIT_TIME)
 783                return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 784                                      flags | MSG_CMSG_COMPAT,
 785                                      (struct timespec *) timeout);
 786
 787        if (timeout == NULL)
 788                return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 789                                      flags | MSG_CMSG_COMPAT, NULL);
 790
 791        if (get_compat_timespec(&ktspec, timeout))
 792                return -EFAULT;
 793
 794        datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 795                                   flags | MSG_CMSG_COMPAT, &ktspec);
 796        if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
 797                datagrams = -EFAULT;
 798
 799        return datagrams;
 800}
 801
 802asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 803{
 804        int ret;
 805        u32 a[6];
 806        u32 a0, a1;
 807
 808        if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 809                return -EINVAL;
 810        if (copy_from_user(a, args, nas[call]))
 811                return -EFAULT;
 812        a0 = a[0];
 813        a1 = a[1];
 814
 815        switch (call) {
 816        case SYS_SOCKET:
 817                ret = sys_socket(a0, a1, a[2]);
 818                break;
 819        case SYS_BIND:
 820                ret = sys_bind(a0, compat_ptr(a1), a[2]);
 821                break;
 822        case SYS_CONNECT:
 823                ret = sys_connect(a0, compat_ptr(a1), a[2]);
 824                break;
 825        case SYS_LISTEN:
 826                ret = sys_listen(a0, a1);
 827                break;
 828        case SYS_ACCEPT:
 829                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 830                break;
 831        case SYS_GETSOCKNAME:
 832                ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 833                break;
 834        case SYS_GETPEERNAME:
 835                ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 836                break;
 837        case SYS_SOCKETPAIR:
 838                ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 839                break;
 840        case SYS_SEND:
 841                ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 842                break;
 843        case SYS_SENDTO:
 844                ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 845                break;
 846        case SYS_RECV:
 847                ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 848                break;
 849        case SYS_RECVFROM:
 850                ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 851                                          compat_ptr(a[4]), compat_ptr(a[5]));
 852                break;
 853        case SYS_SHUTDOWN:
 854                ret = sys_shutdown(a0, a1);
 855                break;
 856        case SYS_SETSOCKOPT:
 857                ret = compat_sys_setsockopt(a0, a1, a[2],
 858                                compat_ptr(a[3]), a[4]);
 859                break;
 860        case SYS_GETSOCKOPT:
 861                ret = compat_sys_getsockopt(a0, a1, a[2],
 862                                compat_ptr(a[3]), compat_ptr(a[4]));
 863                break;
 864        case SYS_SENDMSG:
 865                ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 866                break;
 867        case SYS_SENDMMSG:
 868                ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 869                break;
 870        case SYS_RECVMSG:
 871                ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 872                break;
 873        case SYS_RECVMMSG:
 874                ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 875                                          compat_ptr(a[4]));
 876                break;
 877        case SYS_ACCEPT4:
 878                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 879                break;
 880        default:
 881                ret = -EINVAL;
 882                break;
 883        }
 884        return ret;
 885}
 886
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