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_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 223         struct compat_cmsghdr cmhdr;
 224         struct compat_timeval ctv;
 225         struct compat_timespec cts[3];
 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 (!COMPAT_USE_64BIT_TIME) {
 234                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 235                         struct timeval *tv = (struct timeval *)data;
 236                         ctv.tv_sec = tv->tv_sec;
 237                         ctv.tv_usec = tv->tv_usec;
 238                         data = &ctv;
 239                         len = sizeof(ctv);
 240                 }
 241                 if (level == SOL_SOCKET &&
 242                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 243                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 244                         int i;
 245                         struct timespec *ts = (struct timespec *)data;
 246                         for (i = 0; i < count; i++) {
 247                                 cts[i].tv_sec = ts[i].tv_sec;
 248                                 cts[i].tv_nsec = ts[i].tv_nsec;
 249                         }
 250                         data = &cts;
 251                         len = sizeof(cts[0]) * count;
 252                 }
 253         }
 254
 255         cmlen = CMSG_COMPAT_LEN(len);
 256         if (kmsg->msg_controllen < cmlen) {
 257                 kmsg->msg_flags |= MSG_CTRUNC;
 258                 cmlen = kmsg->msg_controllen;
 259         }
 260         cmhdr.cmsg_level = level;
 261         cmhdr.cmsg_type = type;
 262         cmhdr.cmsg_len = cmlen;
 263
 264         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 265                 return -EFAULT;
 266         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 267                 return -EFAULT;
 268         cmlen = CMSG_COMPAT_SPACE(len);
 269         if (kmsg->msg_controllen < cmlen)
 270                 cmlen = kmsg->msg_controllen;
 271         kmsg->msg_control += cmlen;
 272         kmsg->msg_controllen -= cmlen;
 273         return 0;
 274 }
 275
 276 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 277 {
 278         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 279         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 280         int fdnum = scm->fp->count;
 281         struct file **fp = scm->fp->fp;
 282         int __user *cmfptr;
 283         int err = 0, i;
 284
 285         if (fdnum < fdmax)
 286                 fdmax = fdnum;
 287
 288         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 289                 int new_fd;
 290                 err = security_file_receive(fp[i]);
 291                 if (err)
 292                         break;
 293                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 294                                           ? O_CLOEXEC : 0);
 295                 if (err < 0)
 296                         break;
 297                 new_fd = err;
 298                 err = put_user(new_fd, cmfptr);
 299                 if (err) {
 300                         put_unused_fd(new_fd);
 301                         break;
 302                 }
 303                 /* Bump the usage count and install the file. */
 304                 fd_install(new_fd, get_file(fp[i]));
 305         }
 306
 307         if (i > 0) {
 308                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 309                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 310                 if (!err)
 311                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 312                 if (!err)
 313                         err = put_user(cmlen, &cm->cmsg_len);
 314                 if (!err) {
 315                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 316                         kmsg->msg_control += cmlen;
 317                         kmsg->msg_controllen -= cmlen;
 318                 }
 319         }
 320         if (i < fdnum)
 321                 kmsg->msg_flags |= MSG_CTRUNC;
 322
 323         /*
 324          * All of the files that fit in the message have had their
 325          * usage counts incremented, so we just free the list.
 326          */
 327         __scm_destroy(scm);
 328 }
 329
 330 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 331                                 char __user *optval, unsigned int optlen)
 332 {
 333         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 334         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 335         compat_uptr_t ptr;
 336         u16 len;
 337
 338         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 339             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 340             __get_user(len, &fprog32->len) ||
 341             __get_user(ptr, &fprog32->filter) ||
 342             __put_user(len, &kfprog->len) ||
 343             __put_user(compat_ptr(ptr), &kfprog->filter))
 344                 return -EFAULT;
 345
 346         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 347                               sizeof(struct sock_fprog));
 348 }
 349
 350 static int do_set_sock_timeout(struct socket *sock, int level,
 351                 int optname, char __user *optval, unsigned int optlen)
 352 {
 353         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 354         struct timeval ktime;
 355         mm_segment_t old_fs;
 356         int err;
 357
 358         if (optlen < sizeof(*up))
 359                 return -EINVAL;
 360         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 361             __get_user(ktime.tv_sec, &up->tv_sec) ||
 362             __get_user(ktime.tv_usec, &up->tv_usec))
 363                 return -EFAULT;
 364         old_fs = get_fs();
 365         set_fs(KERNEL_DS);
 366         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 367         set_fs(old_fs);
 368
 369         return err;
 370 }
 371
 372 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 373                                 char __user *optval, unsigned int optlen)
 374 {
 375         if (optname == SO_ATTACH_FILTER)
 376                 return do_set_attach_filter(sock, level, optname,
 377                                             optval, optlen);
 378         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 379                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 380
 381         return sock_setsockopt(sock, level, optname, optval, optlen);
 382 }
 383
 384 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 385                                 char __user *optval, unsigned int optlen)
 386 {
 387         int err;
 388         struct socket *sock = sockfd_lookup(fd, &err);
 389
 390         if (sock) {
 391                 err = security_socket_setsockopt(sock, level, optname);
 392                 if (err) {
 393                         sockfd_put(sock);
 394                         return err;
 395                 }
 396
 397                 if (level == SOL_SOCKET)
 398                         err = compat_sock_setsockopt(sock, level,
 399                                         optname, optval, optlen);
 400                 else if (sock->ops->compat_setsockopt)
 401                         err = sock->ops->compat_setsockopt(sock, level,
 402                                         optname, optval, optlen);
 403                 else
 404                         err = sock->ops->setsockopt(sock, level,
 405                                         optname, optval, optlen);
 406                 sockfd_put(sock);
 407         }
 408         return err;
 409 }
 410
 411 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 412                 char __user *optval, int __user *optlen)
 413 {
 414         struct compat_timeval __user *up;
 415         struct timeval ktime;
 416         mm_segment_t old_fs;
 417         int len, err;
 418
 419         up = (struct compat_timeval __user *) optval;
 420         if (get_user(len, optlen))
 421                 return -EFAULT;
 422         if (len < sizeof(*up))
 423                 return -EINVAL;
 424         len = sizeof(ktime);
 425         old_fs = get_fs();
 426         set_fs(KERNEL_DS);
 427         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 428         set_fs(old_fs);
 429
 430         if (!err) {
 431                 if (put_user(sizeof(*up), optlen) ||
 432                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 433                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 434                     __put_user(ktime.tv_usec, &up->tv_usec))
 435                         err = -EFAULT;
 436         }
 437         return err;
 438 }
 439
 440 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 441                                 char __user *optval, int __user *optlen)
 442 {
 443         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 444                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 445         return sock_getsockopt(sock, level, optname, optval, optlen);
 446 }
 447
 448 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 449 {
 450         struct compat_timeval __user *ctv;
 451         int err;
 452         struct timeval tv;
 453
 454         if (COMPAT_USE_64BIT_TIME)
 455                 return sock_get_timestamp(sk, userstamp);
 456
 457         ctv = (struct compat_timeval __user *) userstamp;
 458         err = -ENOENT;
 459         if (!sock_flag(sk, SOCK_TIMESTAMP))
 460                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 461         tv = ktime_to_timeval(sk->sk_stamp);
 462         if (tv.tv_sec == -1)
 463                 return err;
 464         if (tv.tv_sec == 0) {
 465                 sk->sk_stamp = ktime_get_real();
 466                 tv = ktime_to_timeval(sk->sk_stamp);
 467         }
 468         err = 0;
 469         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 470                         put_user(tv.tv_usec, &ctv->tv_usec))
 471                 err = -EFAULT;
 472         return err;
 473 }
 474 EXPORT_SYMBOL(compat_sock_get_timestamp);
 475
 476 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 477 {
 478         struct compat_timespec __user *ctv;
 479         int err;
 480         struct timespec ts;
 481
 482         if (COMPAT_USE_64BIT_TIME)
 483                 return sock_get_timestampns (sk, userstamp);
 484
 485         ctv = (struct compat_timespec __user *) userstamp;
 486         err = -ENOENT;
 487         if (!sock_flag(sk, SOCK_TIMESTAMP))
 488                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 489         ts = ktime_to_timespec(sk->sk_stamp);
 490         if (ts.tv_sec == -1)
 491                 return err;
 492         if (ts.tv_sec == 0) {
 493                 sk->sk_stamp = ktime_get_real();
 494                 ts = ktime_to_timespec(sk->sk_stamp);
 495         }
 496         err = 0;
 497         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 498                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 499                 err = -EFAULT;
 500         return err;
 501 }
 502 EXPORT_SYMBOL(compat_sock_get_timestampns);
 503
 504 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 505                                 char __user *optval, int __user *optlen)
 506 {
 507         int err;
 508         struct socket *sock = sockfd_lookup(fd, &err);
 509
 510         if (sock) {
 511                 err = security_socket_getsockopt(sock, level, optname);
 512                 if (err) {
 513                         sockfd_put(sock);
 514                         return err;
 515                 }
 516
 517                 if (level == SOL_SOCKET)
 518                         err = compat_sock_getsockopt(sock, level,
 519                                         optname, optval, optlen);
 520                 else if (sock->ops->compat_getsockopt)
 521                         err = sock->ops->compat_getsockopt(sock, level,
 522                                         optname, optval, optlen);
 523                 else
 524                         err = sock->ops->getsockopt(sock, level,
 525                                         optname, optval, optlen);
 526                 sockfd_put(sock);
 527         }
 528         return err;
 529 }
 530
 531 struct compat_group_req {
 532         __u32                            gr_interface;
 533         struct __kernel_sockaddr_storage gr_group
 534                 __attribute__ ((aligned(4)));
 535 } __packed;
 536
 537 struct compat_group_source_req {
 538         __u32                            gsr_interface;
 539         struct __kernel_sockaddr_storage gsr_group
 540                 __attribute__ ((aligned(4)));
 541         struct __kernel_sockaddr_storage gsr_source
 542                 __attribute__ ((aligned(4)));
 543 } __packed;
 544
 545 struct compat_group_filter {
 546         __u32                            gf_interface;
 547         struct __kernel_sockaddr_storage gf_group
 548                 __attribute__ ((aligned(4)));
 549         __u32                            gf_fmode;
 550         __u32                            gf_numsrc;
 551         struct __kernel_sockaddr_storage gf_slist[1]
 552                 __attribute__ ((aligned(4)));
 553 } __packed;
 554
 555 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 556                         sizeof(struct __kernel_sockaddr_storage))
 557
 558
 559 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 560         char __user *optval, unsigned int optlen,
 561         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 562 {
 563         char __user     *koptval = optval;
 564         int             koptlen = optlen;
 565
 566         switch (optname) {
 567         case MCAST_JOIN_GROUP:
 568         case MCAST_LEAVE_GROUP:
 569         {
 570                 struct compat_group_req __user *gr32 = (void *)optval;
 571                 struct group_req __user *kgr =
 572                         compat_alloc_user_space(sizeof(struct group_req));
 573                 u32 interface;
 574
 575                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 576                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 577                     __get_user(interface, &gr32->gr_interface) ||
 578                     __put_user(interface, &kgr->gr_interface) ||
 579                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 580                                 sizeof(kgr->gr_group)))
 581                         return -EFAULT;
 582                 koptval = (char __user *)kgr;
 583                 koptlen = sizeof(struct group_req);
 584                 break;
 585         }
 586         case MCAST_JOIN_SOURCE_GROUP:
 587         case MCAST_LEAVE_SOURCE_GROUP:
 588         case MCAST_BLOCK_SOURCE:
 589         case MCAST_UNBLOCK_SOURCE:
 590         {
 591                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 592                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 593                         sizeof(struct group_source_req));
 594                 u32 interface;
 595
 596                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 597                     !access_ok(VERIFY_WRITE, kgsr,
 598                         sizeof(struct group_source_req)) ||
 599                     __get_user(interface, &gsr32->gsr_interface) ||
 600                     __put_user(interface, &kgsr->gsr_interface) ||
 601                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 602                                 sizeof(kgsr->gsr_group)) ||
 603                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 604                                 sizeof(kgsr->gsr_source)))
 605                         return -EFAULT;
 606                 koptval = (char __user *)kgsr;
 607                 koptlen = sizeof(struct group_source_req);
 608                 break;
 609         }
 610         case MCAST_MSFILTER:
 611         {
 612                 struct compat_group_filter __user *gf32 = (void *)optval;
 613                 struct group_filter __user *kgf;
 614                 u32 interface, fmode, numsrc;
 615
 616                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 617                     __get_user(interface, &gf32->gf_interface) ||
 618                     __get_user(fmode, &gf32->gf_fmode) ||
 619                     __get_user(numsrc, &gf32->gf_numsrc))
 620                         return -EFAULT;
 621                 koptlen = optlen + sizeof(struct group_filter) -
 622                                 sizeof(struct compat_group_filter);
 623                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 624                         return -EINVAL;
 625                 kgf = compat_alloc_user_space(koptlen);
 626                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 627                     __put_user(interface, &kgf->gf_interface) ||
 628                     __put_user(fmode, &kgf->gf_fmode) ||
 629                     __put_user(numsrc, &kgf->gf_numsrc) ||
 630                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 631                                 sizeof(kgf->gf_group)) ||
 632                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 633                                 numsrc * sizeof(kgf->gf_slist[0]))))
 634                         return -EFAULT;
 635                 koptval = (char __user *)kgf;
 636                 break;
 637         }
 638
 639         default:
 640                 break;
 641         }
 642         return setsockopt(sock, level, optname, koptval, koptlen);
 643 }
 644 EXPORT_SYMBOL(compat_mc_setsockopt);
 645
 646 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 647         char __user *optval, int __user *optlen,
 648         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 649 {
 650         struct compat_group_filter __user *gf32 = (void *)optval;
 651         struct group_filter __user *kgf;
 652         int __user      *koptlen;
 653         u32 interface, fmode, numsrc;
 654         int klen, ulen, err;
 655
 656         if (optname != MCAST_MSFILTER)
 657                 return getsockopt(sock, level, optname, optval, optlen);
 658
 659         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 660         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 661             __get_user(ulen, optlen))
 662                 return -EFAULT;
 663
 664         /* adjust len for pad */
 665         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 666
 667         if (klen < GROUP_FILTER_SIZE(0))
 668                 return -EINVAL;
 669
 670         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 671             __put_user(klen, koptlen))
 672                 return -EFAULT;
 673
 674         /* have to allow space for previous compat_alloc_user_space, too */
 675         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 676
 677         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 678             __get_user(interface, &gf32->gf_interface) ||
 679             __get_user(fmode, &gf32->gf_fmode) ||
 680             __get_user(numsrc, &gf32->gf_numsrc) ||
 681             __put_user(interface, &kgf->gf_interface) ||
 682             __put_user(fmode, &kgf->gf_fmode) ||
 683             __put_user(numsrc, &kgf->gf_numsrc) ||
 684             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 685                 return -EFAULT;
 686
 687         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 688         if (err)
 689                 return err;
 690
 691         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 692             __get_user(klen, koptlen))
 693                 return -EFAULT;
 694
 695         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 696
 697         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 698             __put_user(ulen, optlen))
 699                 return -EFAULT;
 700
 701         if (!access_ok(VERIFY_READ, kgf, klen) ||
 702             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 703             __get_user(interface, &kgf->gf_interface) ||
 704             __get_user(fmode, &kgf->gf_fmode) ||
 705             __get_user(numsrc, &kgf->gf_numsrc) ||
 706             __put_user(interface, &gf32->gf_interface) ||
 707             __put_user(fmode, &gf32->gf_fmode) ||
 708             __put_user(numsrc, &gf32->gf_numsrc))
 709                 return -EFAULT;
 710         if (numsrc) {
 711                 int copylen;
 712
 713                 klen -= GROUP_FILTER_SIZE(0);
 714                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 715                 if (copylen > klen)
 716                         copylen = klen;
 717                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 718                         return -EFAULT;
 719         }
 720         return err;
 721 }
 722 EXPORT_SYMBOL(compat_mc_getsockopt);
 723
 724
 725 /* Argument list sizes for compat_sys_socketcall */
 726 #define AL(x) ((x) * sizeof(u32))
 727 static unsigned char nas[21] = {
 728         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 729         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 730         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 731         AL(4), AL(5), AL(4)
 732 };
 733 #undef AL
 734
 735 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 736 {
 737         return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 738 }
 739
 740 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 741                                     unsigned int vlen, unsigned int flags)
 742 {
 743         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 744                               flags | MSG_CMSG_COMPAT);
 745 }
 746
 747 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 748 {
 749         return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 750 }
 751
 752 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
 753 {
 754         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 755 }
 756
 757 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
 758                                     unsigned int flags, struct sockaddr __user *addr,
 759                                     int __user *addrlen)
 760 {
 761         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 762 }
 763
 764 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 765                                     unsigned int vlen, unsigned int flags,
 766                                     struct compat_timespec __user *timeout)
 767 {
 768         int datagrams;
 769         struct timespec ktspec;
 770
 771         if (COMPAT_USE_64BIT_TIME)
 772                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 773                                       flags | MSG_CMSG_COMPAT,
 774                                       (struct timespec *) timeout);
 775
 776         if (timeout == NULL)
 777                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 778                                       flags | MSG_CMSG_COMPAT, NULL);
 779
 780         if (get_compat_timespec(&ktspec, timeout))
 781                 return -EFAULT;
 782
 783         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 784                                    flags | MSG_CMSG_COMPAT, &ktspec);
 785         if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
 786                 datagrams = -EFAULT;
 787
 788         return datagrams;
 789 }
 790
 791 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 792 {
 793         int ret;
 794         u32 a[6];
 795         u32 a0, a1;
 796
 797         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 798                 return -EINVAL;
 799         if (copy_from_user(a, args, nas[call]))
 800                 return -EFAULT;
 801         a0 = a[0];
 802         a1 = a[1];
 803
 804         switch (call) {
 805         case SYS_SOCKET:
 806                 ret = sys_socket(a0, a1, a[2]);
 807                 break;
 808         case SYS_BIND:
 809                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 810                 break;
 811         case SYS_CONNECT:
 812                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 813                 break;
 814         case SYS_LISTEN:
 815                 ret = sys_listen(a0, a1);
 816                 break;
 817         case SYS_ACCEPT:
 818                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 819                 break;
 820         case SYS_GETSOCKNAME:
 821                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 822                 break;
 823         case SYS_GETPEERNAME:
 824                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 825                 break;
 826         case SYS_SOCKETPAIR:
 827                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 828                 break;
 829         case SYS_SEND:
 830                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 831                 break;
 832         case SYS_SENDTO:
 833                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 834                 break;
 835         case SYS_RECV:
 836                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 837                 break;
 838         case SYS_RECVFROM:
 839                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 840                                           compat_ptr(a[4]), compat_ptr(a[5]));
 841                 break;
 842         case SYS_SHUTDOWN:
 843                 ret = sys_shutdown(a0, a1);
 844                 break;
 845         case SYS_SETSOCKOPT:
 846                 ret = compat_sys_setsockopt(a0, a1, a[2],
 847                                 compat_ptr(a[3]), a[4]);
 848                 break;
 849         case SYS_GETSOCKOPT:
 850                 ret = compat_sys_getsockopt(a0, a1, a[2],
 851                                 compat_ptr(a[3]), compat_ptr(a[4]));
 852                 break;
 853         case SYS_SENDMSG:
 854                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 855                 break;
 856         case SYS_SENDMMSG:
 857                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 858                 break;
 859         case SYS_RECVMSG:
 860                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 861                 break;
 862         case SYS_RECVMMSG:
 863                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 864                                           compat_ptr(a[4]));
 865                 break;
 866         case SYS_ACCEPT4:
 867                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 868                 break;
 869         default:
 870                 ret = -EINVAL;
 871                 break;
 872         }
 873         return ret;
 874 }