net/compat.c

   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
  34 static 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
  61 int 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. */
  81 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  82                    struct sockaddr_storage *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
 128 static 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  */
 142 int 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
 212 Einval:
 213         err = -EINVAL;
 214 Efault:
 215         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 216                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 217         return err;
 218 }
 219
 220 int 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
 274 void 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  */
 332 struct compat_sock_fprog {
 333         u16             len;
 334         compat_uptr_t   filter;         /* struct sock_filter * */
 335 };
 336
 337 static 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
 357 static 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
 379 static 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
 391 asmlinkage 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
 418 static 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
 447 static 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
 455 int 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 }
 477 EXPORT_SYMBOL(compat_sock_get_timestamp);
 478
 479 int 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 }
 501 EXPORT_SYMBOL(compat_sock_get_timestampns);
 502
 503 asmlinkage 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
 530 struct compat_group_req {
 531         __u32                            gr_interface;
 532         struct __kernel_sockaddr_storage gr_group
 533                 __attribute__ ((aligned(4)));
 534 } __packed;
 535
 536 struct 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
 544 struct 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
 558 int 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 }
 643 EXPORT_SYMBOL(compat_mc_setsockopt);
 644
 645 int 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 }
 721 EXPORT_SYMBOL(compat_mc_getsockopt);
 722
 723
 724 /* Argument list sizes for compat_sys_socketcall */
 725 #define AL(x) ((x) * sizeof(u32))
 726 static 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
 734 asmlinkage 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
 739 asmlinkage 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
 746 asmlinkage 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
 751 asmlinkage 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
 756 asmlinkage 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
 763 asmlinkage 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
 785 asmlinkage 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 }