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         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  75                 return -EINVAL;
  76         kmsg->msg_name = compat_ptr(tmp1);
  77         kmsg->msg_iov = compat_ptr(tmp2);
  78         kmsg->msg_control = compat_ptr(tmp3);
  79         return 0;
  80 }
  81
  82 /* I've named the args so it is easy to tell whose space the pointers are in. */
  83 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  84                    struct sockaddr_storage *kern_address, int mode)
  85 {
  86         int tot_len;
  87
  88         if (kern_msg->msg_namelen) {
  89                 if (mode == VERIFY_READ) {
  90                         int err = move_addr_to_kernel(kern_msg->msg_name,
  91                                                       kern_msg->msg_namelen,
  92                                                       kern_address);
  93                         if (err < 0)
  94                                 return err;
  95                 }
  96                 if (kern_msg->msg_name)
  97                         kern_msg->msg_name = kern_address;
  98         } else
  99                 kern_msg->msg_name = NULL;
 100
 101         tot_len = iov_from_user_compat_to_kern(kern_iov,
 102                                           (struct compat_iovec __user *)kern_msg->msg_iov,
 103                                           kern_msg->msg_iovlen);
 104         if (tot_len >= 0)
 105                 kern_msg->msg_iov = kern_iov;
 106
 107         return tot_len;
 108 }
 109
 110 /* Bleech... */
 111 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 112
 113 #define CMSG_COMPAT_DATA(cmsg)                          \
 114         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 115 #define CMSG_COMPAT_SPACE(len)                          \
 116         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 117 #define CMSG_COMPAT_LEN(len)                            \
 118         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 119
 120 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 121         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 122          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 123          (struct compat_cmsghdr __user *)NULL)
 124
 125 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 126         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 127          (ucmlen) <= (unsigned long) \
 128          ((mhdr)->msg_controllen - \
 129           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 130
 131 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 132                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 133 {
 134         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 135         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 136                         msg->msg_controllen)
 137                 return NULL;
 138         return (struct compat_cmsghdr __user *)ptr;
 139 }
 140
 141 /* There is a lot of hair here because the alignment rules (and
 142  * thus placement) of cmsg headers and length are different for
 143  * 32-bit apps.  -DaveM
 144  */
 145 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 146                                unsigned char *stackbuf, int stackbuf_size)
 147 {
 148         struct compat_cmsghdr __user *ucmsg;
 149         struct cmsghdr *kcmsg, *kcmsg_base;
 150         compat_size_t ucmlen;
 151         __kernel_size_t kcmlen, tmp;
 152         int err = -EFAULT;
 153
 154         kcmlen = 0;
 155         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 156         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 157         while (ucmsg != NULL) {
 158                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 159                         return -EFAULT;
 160
 161                 /* Catch bogons. */
 162                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 163                         return -EINVAL;
 164
 165                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 166                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 167                 tmp = CMSG_ALIGN(tmp);
 168                 kcmlen += tmp;
 169                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 170         }
 171         if (kcmlen == 0)
 172                 return -EINVAL;
 173
 174         /* The kcmlen holds the 64-bit version of the control length.
 175          * It may not be modified as we do not stick it into the kmsg
 176          * until we have successfully copied over all of the data
 177          * from the user.
 178          */
 179         if (kcmlen > stackbuf_size)
 180                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 181         if (kcmsg == NULL)
 182                 return -ENOBUFS;
 183
 184         /* Now copy them over neatly. */
 185         memset(kcmsg, 0, kcmlen);
 186         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 187         while (ucmsg != NULL) {
 188                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 189                         goto Efault;
 190                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 191                         goto Einval;
 192                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 193                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 194                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 195                         goto Einval;
 196                 kcmsg->cmsg_len = tmp;
 197                 tmp = CMSG_ALIGN(tmp);
 198                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 199                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 200                     copy_from_user(CMSG_DATA(kcmsg),
 201                                    CMSG_COMPAT_DATA(ucmsg),
 202                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 203                         goto Efault;
 204
 205                 /* Advance. */
 206                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 207                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 208         }
 209
 210         /* Ok, looks like we made it.  Hook it up and return success. */
 211         kmsg->msg_control = kcmsg_base;
 212         kmsg->msg_controllen = kcmlen;
 213         return 0;
 214
 215 Einval:
 216         err = -EINVAL;
 217 Efault:
 218         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 219                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 220         return err;
 221 }
 222
 223 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 224 {
 225         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 226         struct compat_cmsghdr cmhdr;
 227         struct compat_timeval ctv;
 228         struct compat_timespec cts[3];
 229         int cmlen;
 230
 231         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 232                 kmsg->msg_flags |= MSG_CTRUNC;
 233                 return 0; /* XXX: return error? check spec. */
 234         }
 235
 236         if (!COMPAT_USE_64BIT_TIME) {
 237                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 238                         struct timeval *tv = (struct timeval *)data;
 239                         ctv.tv_sec = tv->tv_sec;
 240                         ctv.tv_usec = tv->tv_usec;
 241                         data = &ctv;
 242                         len = sizeof(ctv);
 243                 }
 244                 if (level == SOL_SOCKET &&
 245                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 246                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 247                         int i;
 248                         struct timespec *ts = (struct timespec *)data;
 249                         for (i = 0; i < count; i++) {
 250                                 cts[i].tv_sec = ts[i].tv_sec;
 251                                 cts[i].tv_nsec = ts[i].tv_nsec;
 252                         }
 253                         data = &cts;
 254                         len = sizeof(cts[0]) * count;
 255                 }
 256         }
 257
 258         cmlen = CMSG_COMPAT_LEN(len);
 259         if (kmsg->msg_controllen < cmlen) {
 260                 kmsg->msg_flags |= MSG_CTRUNC;
 261                 cmlen = kmsg->msg_controllen;
 262         }
 263         cmhdr.cmsg_level = level;
 264         cmhdr.cmsg_type = type;
 265         cmhdr.cmsg_len = cmlen;
 266
 267         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 268                 return -EFAULT;
 269         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 270                 return -EFAULT;
 271         cmlen = CMSG_COMPAT_SPACE(len);
 272         if (kmsg->msg_controllen < cmlen)
 273                 cmlen = kmsg->msg_controllen;
 274         kmsg->msg_control += cmlen;
 275         kmsg->msg_controllen -= cmlen;
 276         return 0;
 277 }
 278
 279 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 280 {
 281         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 282         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 283         int fdnum = scm->fp->count;
 284         struct file **fp = scm->fp->fp;
 285         int __user *cmfptr;
 286         int err = 0, i;
 287
 288         if (fdnum < fdmax)
 289                 fdmax = fdnum;
 290
 291         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 292                 int new_fd;
 293                 err = security_file_receive(fp[i]);
 294                 if (err)
 295                         break;
 296                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 297                                           ? O_CLOEXEC : 0);
 298                 if (err < 0)
 299                         break;
 300                 new_fd = err;
 301                 err = put_user(new_fd, cmfptr);
 302                 if (err) {
 303                         put_unused_fd(new_fd);
 304                         break;
 305                 }
 306                 /* Bump the usage count and install the file. */
 307                 fd_install(new_fd, get_file(fp[i]));
 308         }
 309
 310         if (i > 0) {
 311                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 312                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 313                 if (!err)
 314                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 315                 if (!err)
 316                         err = put_user(cmlen, &cm->cmsg_len);
 317                 if (!err) {
 318                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 319                         kmsg->msg_control += cmlen;
 320                         kmsg->msg_controllen -= cmlen;
 321                 }
 322         }
 323         if (i < fdnum)
 324                 kmsg->msg_flags |= MSG_CTRUNC;
 325
 326         /*
 327          * All of the files that fit in the message have had their
 328          * usage counts incremented, so we just free the list.
 329          */
 330         __scm_destroy(scm);
 331 }
 332
 333 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 334                                 char __user *optval, unsigned int optlen)
 335 {
 336         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 337         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 338         compat_uptr_t ptr;
 339         u16 len;
 340
 341         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 342             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 343             __get_user(len, &fprog32->len) ||
 344             __get_user(ptr, &fprog32->filter) ||
 345             __put_user(len, &kfprog->len) ||
 346             __put_user(compat_ptr(ptr), &kfprog->filter))
 347                 return -EFAULT;
 348
 349         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 350                               sizeof(struct sock_fprog));
 351 }
 352
 353 static int do_set_sock_timeout(struct socket *sock, int level,
 354                 int optname, char __user *optval, unsigned int optlen)
 355 {
 356         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 357         struct timeval ktime;
 358         mm_segment_t old_fs;
 359         int err;
 360
 361         if (optlen < sizeof(*up))
 362                 return -EINVAL;
 363         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 364             __get_user(ktime.tv_sec, &up->tv_sec) ||
 365             __get_user(ktime.tv_usec, &up->tv_usec))
 366                 return -EFAULT;
 367         old_fs = get_fs();
 368         set_fs(KERNEL_DS);
 369         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 370         set_fs(old_fs);
 371
 372         return err;
 373 }
 374
 375 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 376                                 char __user *optval, unsigned int optlen)
 377 {
 378         if (optname == SO_ATTACH_FILTER)
 379                 return do_set_attach_filter(sock, level, optname,
 380                                             optval, optlen);
 381         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 382                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 383
 384         return sock_setsockopt(sock, level, optname, optval, optlen);
 385 }
 386
 387 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 388                                 char __user *optval, unsigned int optlen)
 389 {
 390         int err;
 391         struct socket *sock = sockfd_lookup(fd, &err);
 392
 393         if (sock) {
 394                 err = security_socket_setsockopt(sock, level, optname);
 395                 if (err) {
 396                         sockfd_put(sock);
 397                         return err;
 398                 }
 399
 400                 if (level == SOL_SOCKET)
 401                         err = compat_sock_setsockopt(sock, level,
 402                                         optname, optval, optlen);
 403                 else if (sock->ops->compat_setsockopt)
 404                         err = sock->ops->compat_setsockopt(sock, level,
 405                                         optname, optval, optlen);
 406                 else
 407                         err = sock->ops->setsockopt(sock, level,
 408                                         optname, optval, optlen);
 409                 sockfd_put(sock);
 410         }
 411         return err;
 412 }
 413
 414 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 415                 char __user *optval, int __user *optlen)
 416 {
 417         struct compat_timeval __user *up;
 418         struct timeval ktime;
 419         mm_segment_t old_fs;
 420         int len, err;
 421
 422         up = (struct compat_timeval __user *) optval;
 423         if (get_user(len, optlen))
 424                 return -EFAULT;
 425         if (len < sizeof(*up))
 426                 return -EINVAL;
 427         len = sizeof(ktime);
 428         old_fs = get_fs();
 429         set_fs(KERNEL_DS);
 430         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 431         set_fs(old_fs);
 432
 433         if (!err) {
 434                 if (put_user(sizeof(*up), optlen) ||
 435                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 436                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 437                     __put_user(ktime.tv_usec, &up->tv_usec))
 438                         err = -EFAULT;
 439         }
 440         return err;
 441 }
 442
 443 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 444                                 char __user *optval, int __user *optlen)
 445 {
 446         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 447                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 448         return sock_getsockopt(sock, level, optname, optval, optlen);
 449 }
 450
 451 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 452 {
 453         struct compat_timeval __user *ctv;
 454         int err;
 455         struct timeval tv;
 456
 457         if (COMPAT_USE_64BIT_TIME)
 458                 return sock_get_timestamp(sk, userstamp);
 459
 460         ctv = (struct compat_timeval __user *) userstamp;
 461         err = -ENOENT;
 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         int err;
 483         struct timespec ts;
 484
 485         if (COMPAT_USE_64BIT_TIME)
 486                 return sock_get_timestampns (sk, userstamp);
 487
 488         ctv = (struct compat_timespec __user *) userstamp;
 489         err = -ENOENT;
 490         if (!sock_flag(sk, SOCK_TIMESTAMP))
 491                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 492         ts = ktime_to_timespec(sk->sk_stamp);
 493         if (ts.tv_sec == -1)
 494                 return err;
 495         if (ts.tv_sec == 0) {
 496                 sk->sk_stamp = ktime_get_real();
 497                 ts = ktime_to_timespec(sk->sk_stamp);
 498         }
 499         err = 0;
 500         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 501                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 502                 err = -EFAULT;
 503         return err;
 504 }
 505 EXPORT_SYMBOL(compat_sock_get_timestampns);
 506
 507 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 508                                 char __user *optval, int __user *optlen)
 509 {
 510         int err;
 511         struct socket *sock = sockfd_lookup(fd, &err);
 512
 513         if (sock) {
 514                 err = security_socket_getsockopt(sock, level, optname);
 515                 if (err) {
 516                         sockfd_put(sock);
 517                         return err;
 518                 }
 519
 520                 if (level == SOL_SOCKET)
 521                         err = compat_sock_getsockopt(sock, level,
 522                                         optname, optval, optlen);
 523                 else if (sock->ops->compat_getsockopt)
 524                         err = sock->ops->compat_getsockopt(sock, level,
 525                                         optname, optval, optlen);
 526                 else
 527                         err = sock->ops->getsockopt(sock, level,
 528                                         optname, optval, optlen);
 529                 sockfd_put(sock);
 530         }
 531         return err;
 532 }
 533
 534 struct compat_group_req {
 535         __u32                            gr_interface;
 536         struct __kernel_sockaddr_storage gr_group
 537                 __attribute__ ((aligned(4)));
 538 } __packed;
 539
 540 struct compat_group_source_req {
 541         __u32                            gsr_interface;
 542         struct __kernel_sockaddr_storage gsr_group
 543                 __attribute__ ((aligned(4)));
 544         struct __kernel_sockaddr_storage gsr_source
 545                 __attribute__ ((aligned(4)));
 546 } __packed;
 547
 548 struct compat_group_filter {
 549         __u32                            gf_interface;
 550         struct __kernel_sockaddr_storage gf_group
 551                 __attribute__ ((aligned(4)));
 552         __u32                            gf_fmode;
 553         __u32                            gf_numsrc;
 554         struct __kernel_sockaddr_storage gf_slist[1]
 555                 __attribute__ ((aligned(4)));
 556 } __packed;
 557
 558 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 559                         sizeof(struct __kernel_sockaddr_storage))
 560
 561
 562 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 563         char __user *optval, unsigned int optlen,
 564         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 565 {
 566         char __user     *koptval = optval;
 567         int             koptlen = optlen;
 568
 569         switch (optname) {
 570         case MCAST_JOIN_GROUP:
 571         case MCAST_LEAVE_GROUP:
 572         {
 573                 struct compat_group_req __user *gr32 = (void *)optval;
 574                 struct group_req __user *kgr =
 575                         compat_alloc_user_space(sizeof(struct group_req));
 576                 u32 interface;
 577
 578                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 579                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 580                     __get_user(interface, &gr32->gr_interface) ||
 581                     __put_user(interface, &kgr->gr_interface) ||
 582                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 583                                 sizeof(kgr->gr_group)))
 584                         return -EFAULT;
 585                 koptval = (char __user *)kgr;
 586                 koptlen = sizeof(struct group_req);
 587                 break;
 588         }
 589         case MCAST_JOIN_SOURCE_GROUP:
 590         case MCAST_LEAVE_SOURCE_GROUP:
 591         case MCAST_BLOCK_SOURCE:
 592         case MCAST_UNBLOCK_SOURCE:
 593         {
 594                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 595                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 596                         sizeof(struct group_source_req));
 597                 u32 interface;
 598
 599                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 600                     !access_ok(VERIFY_WRITE, kgsr,
 601                         sizeof(struct group_source_req)) ||
 602                     __get_user(interface, &gsr32->gsr_interface) ||
 603                     __put_user(interface, &kgsr->gsr_interface) ||
 604                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 605                                 sizeof(kgsr->gsr_group)) ||
 606                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 607                                 sizeof(kgsr->gsr_source)))
 608                         return -EFAULT;
 609                 koptval = (char __user *)kgsr;
 610                 koptlen = sizeof(struct group_source_req);
 611                 break;
 612         }
 613         case MCAST_MSFILTER:
 614         {
 615                 struct compat_group_filter __user *gf32 = (void *)optval;
 616                 struct group_filter __user *kgf;
 617                 u32 interface, fmode, numsrc;
 618
 619                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 620                     __get_user(interface, &gf32->gf_interface) ||
 621                     __get_user(fmode, &gf32->gf_fmode) ||
 622                     __get_user(numsrc, &gf32->gf_numsrc))
 623                         return -EFAULT;
 624                 koptlen = optlen + sizeof(struct group_filter) -
 625                                 sizeof(struct compat_group_filter);
 626                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 627                         return -EINVAL;
 628                 kgf = compat_alloc_user_space(koptlen);
 629                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 630                     __put_user(interface, &kgf->gf_interface) ||
 631                     __put_user(fmode, &kgf->gf_fmode) ||
 632                     __put_user(numsrc, &kgf->gf_numsrc) ||
 633                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 634                                 sizeof(kgf->gf_group)) ||
 635                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 636                                 numsrc * sizeof(kgf->gf_slist[0]))))
 637                         return -EFAULT;
 638                 koptval = (char __user *)kgf;
 639                 break;
 640         }
 641
 642         default:
 643                 break;
 644         }
 645         return setsockopt(sock, level, optname, koptval, koptlen);
 646 }
 647 EXPORT_SYMBOL(compat_mc_setsockopt);
 648
 649 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 650         char __user *optval, int __user *optlen,
 651         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 652 {
 653         struct compat_group_filter __user *gf32 = (void *)optval;
 654         struct group_filter __user *kgf;
 655         int __user      *koptlen;
 656         u32 interface, fmode, numsrc;
 657         int klen, ulen, err;
 658
 659         if (optname != MCAST_MSFILTER)
 660                 return getsockopt(sock, level, optname, optval, optlen);
 661
 662         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 663         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 664             __get_user(ulen, optlen))
 665                 return -EFAULT;
 666
 667         /* adjust len for pad */
 668         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 669
 670         if (klen < GROUP_FILTER_SIZE(0))
 671                 return -EINVAL;
 672
 673         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 674             __put_user(klen, koptlen))
 675                 return -EFAULT;
 676
 677         /* have to allow space for previous compat_alloc_user_space, too */
 678         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 679
 680         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 681             __get_user(interface, &gf32->gf_interface) ||
 682             __get_user(fmode, &gf32->gf_fmode) ||
 683             __get_user(numsrc, &gf32->gf_numsrc) ||
 684             __put_user(interface, &kgf->gf_interface) ||
 685             __put_user(fmode, &kgf->gf_fmode) ||
 686             __put_user(numsrc, &kgf->gf_numsrc) ||
 687             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 688                 return -EFAULT;
 689
 690         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 691         if (err)
 692                 return err;
 693
 694         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 695             __get_user(klen, koptlen))
 696                 return -EFAULT;
 697
 698         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 699
 700         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 701             __put_user(ulen, optlen))
 702                 return -EFAULT;
 703
 704         if (!access_ok(VERIFY_READ, kgf, klen) ||
 705             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 706             __get_user(interface, &kgf->gf_interface) ||
 707             __get_user(fmode, &kgf->gf_fmode) ||
 708             __get_user(numsrc, &kgf->gf_numsrc) ||
 709             __put_user(interface, &gf32->gf_interface) ||
 710             __put_user(fmode, &gf32->gf_fmode) ||
 711             __put_user(numsrc, &gf32->gf_numsrc))
 712                 return -EFAULT;
 713         if (numsrc) {
 714                 int copylen;
 715
 716                 klen -= GROUP_FILTER_SIZE(0);
 717                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 718                 if (copylen > klen)
 719                         copylen = klen;
 720                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 721                         return -EFAULT;
 722         }
 723         return err;
 724 }
 725 EXPORT_SYMBOL(compat_mc_getsockopt);
 726
 727
 728 /* Argument list sizes for compat_sys_socketcall */
 729 #define AL(x) ((x) * sizeof(u32))
 730 static unsigned char nas[21] = {
 731         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 732         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 733         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 734         AL(4), AL(5), AL(4)
 735 };
 736 #undef AL
 737
 738 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 739 {
 740         if (flags & MSG_CMSG_COMPAT)
 741                 return -EINVAL;
 742         return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 743 }
 744
 745 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 746                                     unsigned int vlen, unsigned int flags)
 747 {
 748         if (flags & MSG_CMSG_COMPAT)
 749                 return -EINVAL;
 750         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 751                               flags | MSG_CMSG_COMPAT);
 752 }
 753
 754 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 755 {
 756         if (flags & MSG_CMSG_COMPAT)
 757                 return -EINVAL;
 758         return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 759 }
 760
 761 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
 762 {
 763         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 764 }
 765
 766 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
 767                                     unsigned int flags, struct sockaddr __user *addr,
 768                                     int __user *addrlen)
 769 {
 770         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 771 }
 772
 773 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 774                                     unsigned int vlen, unsigned int flags,
 775                                     struct compat_timespec __user *timeout)
 776 {
 777         int datagrams;
 778         struct timespec ktspec;
 779
 780         if (flags & MSG_CMSG_COMPAT)
 781                 return -EINVAL;
 782
 783         if (COMPAT_USE_64BIT_TIME)
 784                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 785                                       flags | MSG_CMSG_COMPAT,
 786                                       (struct timespec *) timeout);
 787
 788         if (timeout == NULL)
 789                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 790                                       flags | MSG_CMSG_COMPAT, NULL);
 791
 792         if (get_compat_timespec(&ktspec, timeout))
 793                 return -EFAULT;
 794
 795         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 796                                    flags | MSG_CMSG_COMPAT, &ktspec);
 797         if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
 798                 datagrams = -EFAULT;
 799
 800         return datagrams;
 801 }
 802
 803 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 804 {
 805         int ret;
 806         u32 a[6];
 807         u32 a0, a1;
 808
 809         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 810                 return -EINVAL;
 811         if (copy_from_user(a, args, nas[call]))
 812                 return -EFAULT;
 813         a0 = a[0];
 814         a1 = a[1];
 815
 816         switch (call) {
 817         case SYS_SOCKET:
 818                 ret = sys_socket(a0, a1, a[2]);
 819                 break;
 820         case SYS_BIND:
 821                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 822                 break;
 823         case SYS_CONNECT:
 824                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 825                 break;
 826         case SYS_LISTEN:
 827                 ret = sys_listen(a0, a1);
 828                 break;
 829         case SYS_ACCEPT:
 830                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 831                 break;
 832         case SYS_GETSOCKNAME:
 833                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 834                 break;
 835         case SYS_GETPEERNAME:
 836                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 837                 break;
 838         case SYS_SOCKETPAIR:
 839                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 840                 break;
 841         case SYS_SEND:
 842                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 843                 break;
 844         case SYS_SENDTO:
 845                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 846                 break;
 847         case SYS_RECV:
 848                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 849                 break;
 850         case SYS_RECVFROM:
 851                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 852                                           compat_ptr(a[4]), compat_ptr(a[5]));
 853                 break;
 854         case SYS_SHUTDOWN:
 855                 ret = sys_shutdown(a0, a1);
 856                 break;
 857         case SYS_SETSOCKOPT:
 858                 ret = compat_sys_setsockopt(a0, a1, a[2],
 859                                 compat_ptr(a[3]), a[4]);
 860                 break;
 861         case SYS_GETSOCKOPT:
 862                 ret = compat_sys_getsockopt(a0, a1, a[2],
 863                                 compat_ptr(a[3]), compat_ptr(a[4]));
 864                 break;
 865         case SYS_SENDMSG:
 866                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 867                 break;
 868         case SYS_SENDMMSG:
 869                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 870                 break;
 871         case SYS_RECVMSG:
 872                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 873                 break;
 874         case SYS_RECVMMSG:
 875                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 876                                           compat_ptr(a[4]));
 877                 break;
 878         case SYS_ACCEPT4:
 879                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 880                 break;
 881         default:
 882                 ret = -EINVAL;
 883                 break;
 884         }
 885         return ret;
 886 }