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