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                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  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_name && kern_msg->msg_namelen) {
  89                 if (mode == VERIFY_READ) {
  90                         int err = move_addr_to_kernel(kern_msg->msg_name,
  91                                                       kern_msg->msg_namelen,
  92                                                       kern_address);
  93                         if (err < 0)
  94                                 return err;
  95                 }
  96                 kern_msg->msg_name = kern_address;
  97         } else {
  98                 kern_msg->msg_name = NULL;
  99                 kern_msg->msg_namelen = 0;
 100         }
 101
 102         tot_len = iov_from_user_compat_to_kern(kern_iov,
 103                                           (struct compat_iovec __user *)kern_msg->msg_iov,
 104                                           kern_msg->msg_iovlen);
 105         if (tot_len >= 0)
 106                 kern_msg->msg_iov = kern_iov;
 107
 108         return tot_len;
 109 }
 110
 111 /* Bleech... */
 112 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 113
 114 #define CMSG_COMPAT_DATA(cmsg)                          \
 115         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 116 #define CMSG_COMPAT_SPACE(len)                          \
 117         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 118 #define CMSG_COMPAT_LEN(len)                            \
 119         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 120
 121 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 122         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 123          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 124          (struct compat_cmsghdr __user *)NULL)
 125
 126 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 127         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 128          (ucmlen) <= (unsigned long) \
 129          ((mhdr)->msg_controllen - \
 130           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 131
 132 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 133                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 134 {
 135         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 136         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 137                         msg->msg_controllen)
 138                 return NULL;
 139         return (struct compat_cmsghdr __user *)ptr;
 140 }
 141
 142 /* There is a lot of hair here because the alignment rules (and
 143  * thus placement) of cmsg headers and length are different for
 144  * 32-bit apps.  -DaveM
 145  */
 146 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 147                                unsigned char *stackbuf, int stackbuf_size)
 148 {
 149         struct compat_cmsghdr __user *ucmsg;
 150         struct cmsghdr *kcmsg, *kcmsg_base;
 151         compat_size_t ucmlen;
 152         __kernel_size_t kcmlen, tmp;
 153         int err = -EFAULT;
 154
 155         kcmlen = 0;
 156         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 157         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 158         while (ucmsg != NULL) {
 159                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 160                         return -EFAULT;
 161
 162                 /* Catch bogons. */
 163                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 164                         return -EINVAL;
 165
 166                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 167                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 168                 tmp = CMSG_ALIGN(tmp);
 169                 kcmlen += tmp;
 170                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 171         }
 172         if (kcmlen == 0)
 173                 return -EINVAL;
 174
 175         /* The kcmlen holds the 64-bit version of the control length.
 176          * It may not be modified as we do not stick it into the kmsg
 177          * until we have successfully copied over all of the data
 178          * from the user.
 179          */
 180         if (kcmlen > stackbuf_size)
 181                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 182         if (kcmsg == NULL)
 183                 return -ENOBUFS;
 184
 185         /* Now copy them over neatly. */
 186         memset(kcmsg, 0, kcmlen);
 187         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 188         while (ucmsg != NULL) {
 189                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 190                         goto Efault;
 191                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 192                         goto Einval;
 193                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 194                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 195                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 196                         goto Einval;
 197                 kcmsg->cmsg_len = tmp;
 198                 tmp = CMSG_ALIGN(tmp);
 199                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 200                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 201                     copy_from_user(CMSG_DATA(kcmsg),
 202                                    CMSG_COMPAT_DATA(ucmsg),
 203                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 204                         goto Efault;
 205
 206                 /* Advance. */
 207                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 208                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 209         }
 210
 211         /* Ok, looks like we made it.  Hook it up and return success. */
 212         kmsg->msg_control = kcmsg_base;
 213         kmsg->msg_controllen = kcmlen;
 214         return 0;
 215
 216 Einval:
 217         err = -EINVAL;
 218 Efault:
 219         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 220                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 221         return err;
 222 }
 223
 224 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 225 {
 226         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 227         struct compat_cmsghdr cmhdr;
 228         struct compat_timeval ctv;
 229         struct compat_timespec cts[3];
 230         int cmlen;
 231
 232         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 233                 kmsg->msg_flags |= MSG_CTRUNC;
 234                 return 0; /* XXX: return error? check spec. */
 235         }
 236
 237         if (!COMPAT_USE_64BIT_TIME) {
 238                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 239                         struct timeval *tv = (struct timeval *)data;
 240                         ctv.tv_sec = tv->tv_sec;
 241                         ctv.tv_usec = tv->tv_usec;
 242                         data = &ctv;
 243                         len = sizeof(ctv);
 244                 }
 245                 if (level == SOL_SOCKET &&
 246                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 247                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 248                         int i;
 249                         struct timespec *ts = (struct timespec *)data;
 250                         for (i = 0; i < count; i++) {
 251                                 cts[i].tv_sec = ts[i].tv_sec;
 252                                 cts[i].tv_nsec = ts[i].tv_nsec;
 253                         }
 254                         data = &cts;
 255                         len = sizeof(cts[0]) * count;
 256                 }
 257         }
 258
 259         cmlen = CMSG_COMPAT_LEN(len);
 260         if (kmsg->msg_controllen < cmlen) {
 261                 kmsg->msg_flags |= MSG_CTRUNC;
 262                 cmlen = kmsg->msg_controllen;
 263         }
 264         cmhdr.cmsg_level = level;
 265         cmhdr.cmsg_type = type;
 266         cmhdr.cmsg_len = cmlen;
 267
 268         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 269                 return -EFAULT;
 270         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 271                 return -EFAULT;
 272         cmlen = CMSG_COMPAT_SPACE(len);
 273         if (kmsg->msg_controllen < cmlen)
 274                 cmlen = kmsg->msg_controllen;
 275         kmsg->msg_control += cmlen;
 276         kmsg->msg_controllen -= cmlen;
 277         return 0;
 278 }
 279
 280 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 281 {
 282         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 283         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 284         int fdnum = scm->fp->count;
 285         struct file **fp = scm->fp->fp;
 286         int __user *cmfptr;
 287         int err = 0, i;
 288
 289         if (fdnum < fdmax)
 290                 fdmax = fdnum;
 291
 292         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 293                 int new_fd;
 294                 err = security_file_receive(fp[i]);
 295                 if (err)
 296                         break;
 297                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 298                                           ? O_CLOEXEC : 0);
 299                 if (err < 0)
 300                         break;
 301                 new_fd = err;
 302                 err = put_user(new_fd, cmfptr);
 303                 if (err) {
 304                         put_unused_fd(new_fd);
 305                         break;
 306                 }
 307                 /* Bump the usage count and install the file. */
 308                 fd_install(new_fd, get_file(fp[i]));
 309         }
 310
 311         if (i > 0) {
 312                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 313                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 314                 if (!err)
 315                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 316                 if (!err)
 317                         err = put_user(cmlen, &cm->cmsg_len);
 318                 if (!err) {
 319                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 320                         kmsg->msg_control += cmlen;
 321                         kmsg->msg_controllen -= cmlen;
 322                 }
 323         }
 324         if (i < fdnum)
 325                 kmsg->msg_flags |= MSG_CTRUNC;
 326
 327         /*
 328          * All of the files that fit in the message have had their
 329          * usage counts incremented, so we just free the list.
 330          */
 331         __scm_destroy(scm);
 332 }
 333
 334 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 335                                 char __user *optval, unsigned int optlen)
 336 {
 337         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 338         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 339         compat_uptr_t ptr;
 340         u16 len;
 341
 342         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 343             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 344             __get_user(len, &fprog32->len) ||
 345             __get_user(ptr, &fprog32->filter) ||
 346             __put_user(len, &kfprog->len) ||
 347             __put_user(compat_ptr(ptr), &kfprog->filter))
 348                 return -EFAULT;
 349
 350         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 351                               sizeof(struct sock_fprog));
 352 }
 353
 354 static int do_set_sock_timeout(struct socket *sock, int level,
 355                 int optname, char __user *optval, unsigned int optlen)
 356 {
 357         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 358         struct timeval ktime;
 359         mm_segment_t old_fs;
 360         int err;
 361
 362         if (optlen < sizeof(*up))
 363                 return -EINVAL;
 364         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 365             __get_user(ktime.tv_sec, &up->tv_sec) ||
 366             __get_user(ktime.tv_usec, &up->tv_usec))
 367                 return -EFAULT;
 368         old_fs = get_fs();
 369         set_fs(KERNEL_DS);
 370         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 371         set_fs(old_fs);
 372
 373         return err;
 374 }
 375
 376 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 377                                 char __user *optval, unsigned int optlen)
 378 {
 379         if (optname == SO_ATTACH_FILTER)
 380                 return do_set_attach_filter(sock, level, optname,
 381                                             optval, optlen);
 382         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 383                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 384
 385         return sock_setsockopt(sock, level, optname, optval, optlen);
 386 }
 387
 388 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 389                                 char __user *optval, unsigned int optlen)
 390 {
 391         int err;
 392         struct socket *sock = sockfd_lookup(fd, &err);
 393
 394         if (sock) {
 395                 err = security_socket_setsockopt(sock, level, optname);
 396                 if (err) {
 397                         sockfd_put(sock);
 398                         return err;
 399                 }
 400
 401                 if (level == SOL_SOCKET)
 402                         err = compat_sock_setsockopt(sock, level,
 403                                         optname, optval, optlen);
 404                 else if (sock->ops->compat_setsockopt)
 405                         err = sock->ops->compat_setsockopt(sock, level,
 406                                         optname, optval, optlen);
 407                 else
 408                         err = sock->ops->setsockopt(sock, level,
 409                                         optname, optval, optlen);
 410                 sockfd_put(sock);
 411         }
 412         return err;
 413 }
 414
 415 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 416                 char __user *optval, int __user *optlen)
 417 {
 418         struct compat_timeval __user *up;
 419         struct timeval ktime;
 420         mm_segment_t old_fs;
 421         int len, err;
 422
 423         up = (struct compat_timeval __user *) optval;
 424         if (get_user(len, optlen))
 425                 return -EFAULT;
 426         if (len < sizeof(*up))
 427                 return -EINVAL;
 428         len = sizeof(ktime);
 429         old_fs = get_fs();
 430         set_fs(KERNEL_DS);
 431         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 432         set_fs(old_fs);
 433
 434         if (!err) {
 435                 if (put_user(sizeof(*up), optlen) ||
 436                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 437                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 438                     __put_user(ktime.tv_usec, &up->tv_usec))
 439                         err = -EFAULT;
 440         }
 441         return err;
 442 }
 443
 444 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 445                                 char __user *optval, int __user *optlen)
 446 {
 447         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 448                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 449         return sock_getsockopt(sock, level, optname, optval, optlen);
 450 }
 451
 452 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 453 {
 454         struct compat_timeval __user *ctv;
 455         int err;
 456         struct timeval tv;
 457
 458         if (COMPAT_USE_64BIT_TIME)
 459                 return sock_get_timestamp(sk, userstamp);
 460
 461         ctv = (struct compat_timeval __user *) userstamp;
 462         err = -ENOENT;
 463         if (!sock_flag(sk, SOCK_TIMESTAMP))
 464                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 465         tv = ktime_to_timeval(sk->sk_stamp);
 466         if (tv.tv_sec == -1)
 467                 return err;
 468         if (tv.tv_sec == 0) {
 469                 sk->sk_stamp = ktime_get_real();
 470                 tv = ktime_to_timeval(sk->sk_stamp);
 471         }
 472         err = 0;
 473         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 474                         put_user(tv.tv_usec, &ctv->tv_usec))
 475                 err = -EFAULT;
 476         return err;
 477 }
 478 EXPORT_SYMBOL(compat_sock_get_timestamp);
 479
 480 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 481 {
 482         struct compat_timespec __user *ctv;
 483         int err;
 484         struct timespec ts;
 485
 486         if (COMPAT_USE_64BIT_TIME)
 487                 return sock_get_timestampns (sk, userstamp);
 488
 489         ctv = (struct compat_timespec __user *) userstamp;
 490         err = -ENOENT;
 491         if (!sock_flag(sk, SOCK_TIMESTAMP))
 492                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 493         ts = ktime_to_timespec(sk->sk_stamp);
 494         if (ts.tv_sec == -1)
 495                 return err;
 496         if (ts.tv_sec == 0) {
 497                 sk->sk_stamp = ktime_get_real();
 498                 ts = ktime_to_timespec(sk->sk_stamp);
 499         }
 500         err = 0;
 501         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 502                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 503                 err = -EFAULT;
 504         return err;
 505 }
 506 EXPORT_SYMBOL(compat_sock_get_timestampns);
 507
 508 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 509                                 char __user *optval, int __user *optlen)
 510 {
 511         int err;
 512         struct socket *sock = sockfd_lookup(fd, &err);
 513
 514         if (sock) {
 515                 err = security_socket_getsockopt(sock, level, optname);
 516                 if (err) {
 517                         sockfd_put(sock);
 518                         return err;
 519                 }
 520
 521                 if (level == SOL_SOCKET)
 522                         err = compat_sock_getsockopt(sock, level,
 523                                         optname, optval, optlen);
 524                 else if (sock->ops->compat_getsockopt)
 525                         err = sock->ops->compat_getsockopt(sock, level,
 526                                         optname, optval, optlen);
 527                 else
 528                         err = sock->ops->getsockopt(sock, level,
 529                                         optname, optval, optlen);
 530                 sockfd_put(sock);
 531         }
 532         return err;
 533 }
 534
 535 struct compat_group_req {
 536         __u32                            gr_interface;
 537         struct __kernel_sockaddr_storage gr_group
 538                 __attribute__ ((aligned(4)));
 539 } __packed;
 540
 541 struct compat_group_source_req {
 542         __u32                            gsr_interface;
 543         struct __kernel_sockaddr_storage gsr_group
 544                 __attribute__ ((aligned(4)));
 545         struct __kernel_sockaddr_storage gsr_source
 546                 __attribute__ ((aligned(4)));
 547 } __packed;
 548
 549 struct compat_group_filter {
 550         __u32                            gf_interface;
 551         struct __kernel_sockaddr_storage gf_group
 552                 __attribute__ ((aligned(4)));
 553         __u32                            gf_fmode;
 554         __u32                            gf_numsrc;
 555         struct __kernel_sockaddr_storage gf_slist[1]
 556                 __attribute__ ((aligned(4)));
 557 } __packed;
 558
 559 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 560                         sizeof(struct __kernel_sockaddr_storage))
 561
 562
 563 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 564         char __user *optval, unsigned int optlen,
 565         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 566 {
 567         char __user     *koptval = optval;
 568         int             koptlen = optlen;
 569
 570         switch (optname) {
 571         case MCAST_JOIN_GROUP:
 572         case MCAST_LEAVE_GROUP:
 573         {
 574                 struct compat_group_req __user *gr32 = (void *)optval;
 575                 struct group_req __user *kgr =
 576                         compat_alloc_user_space(sizeof(struct group_req));
 577                 u32 interface;
 578
 579                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 580                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 581                     __get_user(interface, &gr32->gr_interface) ||
 582                     __put_user(interface, &kgr->gr_interface) ||
 583                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 584                                 sizeof(kgr->gr_group)))
 585                         return -EFAULT;
 586                 koptval = (char __user *)kgr;
 587                 koptlen = sizeof(struct group_req);
 588                 break;
 589         }
 590         case MCAST_JOIN_SOURCE_GROUP:
 591         case MCAST_LEAVE_SOURCE_GROUP:
 592         case MCAST_BLOCK_SOURCE:
 593         case MCAST_UNBLOCK_SOURCE:
 594         {
 595                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 596                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 597                         sizeof(struct group_source_req));
 598                 u32 interface;
 599
 600                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 601                     !access_ok(VERIFY_WRITE, kgsr,
 602                         sizeof(struct group_source_req)) ||
 603                     __get_user(interface, &gsr32->gsr_interface) ||
 604                     __put_user(interface, &kgsr->gsr_interface) ||
 605                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 606                                 sizeof(kgsr->gsr_group)) ||
 607                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 608                                 sizeof(kgsr->gsr_source)))
 609                         return -EFAULT;
 610                 koptval = (char __user *)kgsr;
 611                 koptlen = sizeof(struct group_source_req);
 612                 break;
 613         }
 614         case MCAST_MSFILTER:
 615         {
 616                 struct compat_group_filter __user *gf32 = (void *)optval;
 617                 struct group_filter __user *kgf;
 618                 u32 interface, fmode, numsrc;
 619
 620                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 621                     __get_user(interface, &gf32->gf_interface) ||
 622                     __get_user(fmode, &gf32->gf_fmode) ||
 623                     __get_user(numsrc, &gf32->gf_numsrc))
 624                         return -EFAULT;
 625                 koptlen = optlen + sizeof(struct group_filter) -
 626                                 sizeof(struct compat_group_filter);
 627                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 628                         return -EINVAL;
 629                 kgf = compat_alloc_user_space(koptlen);
 630                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 631                     __put_user(interface, &kgf->gf_interface) ||
 632                     __put_user(fmode, &kgf->gf_fmode) ||
 633                     __put_user(numsrc, &kgf->gf_numsrc) ||
 634                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 635                                 sizeof(kgf->gf_group)) ||
 636                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 637                                 numsrc * sizeof(kgf->gf_slist[0]))))
 638                         return -EFAULT;
 639                 koptval = (char __user *)kgf;
 640                 break;
 641         }
 642
 643         default:
 644                 break;
 645         }
 646         return setsockopt(sock, level, optname, koptval, koptlen);
 647 }
 648 EXPORT_SYMBOL(compat_mc_setsockopt);
 649
 650 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 651         char __user *optval, int __user *optlen,
 652         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 653 {
 654         struct compat_group_filter __user *gf32 = (void *)optval;
 655         struct group_filter __user *kgf;
 656         int __user      *koptlen;
 657         u32 interface, fmode, numsrc;
 658         int klen, ulen, err;
 659
 660         if (optname != MCAST_MSFILTER)
 661                 return getsockopt(sock, level, optname, optval, optlen);
 662
 663         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 664         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 665             __get_user(ulen, optlen))
 666                 return -EFAULT;
 667
 668         /* adjust len for pad */
 669         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 670
 671         if (klen < GROUP_FILTER_SIZE(0))
 672                 return -EINVAL;
 673
 674         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 675             __put_user(klen, koptlen))
 676                 return -EFAULT;
 677
 678         /* have to allow space for previous compat_alloc_user_space, too */
 679         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 680
 681         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 682             __get_user(interface, &gf32->gf_interface) ||
 683             __get_user(fmode, &gf32->gf_fmode) ||
 684             __get_user(numsrc, &gf32->gf_numsrc) ||
 685             __put_user(interface, &kgf->gf_interface) ||
 686             __put_user(fmode, &kgf->gf_fmode) ||
 687             __put_user(numsrc, &kgf->gf_numsrc) ||
 688             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 689                 return -EFAULT;
 690
 691         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 692         if (err)
 693                 return err;
 694
 695         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 696             __get_user(klen, koptlen))
 697                 return -EFAULT;
 698
 699         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 700
 701         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 702             __put_user(ulen, optlen))
 703                 return -EFAULT;
 704
 705         if (!access_ok(VERIFY_READ, kgf, klen) ||
 706             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 707             __get_user(interface, &kgf->gf_interface) ||
 708             __get_user(fmode, &kgf->gf_fmode) ||
 709             __get_user(numsrc, &kgf->gf_numsrc) ||
 710             __put_user(interface, &gf32->gf_interface) ||
 711             __put_user(fmode, &gf32->gf_fmode) ||
 712             __put_user(numsrc, &gf32->gf_numsrc))
 713                 return -EFAULT;
 714         if (numsrc) {
 715                 int copylen;
 716
 717                 klen -= GROUP_FILTER_SIZE(0);
 718                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 719                 if (copylen > klen)
 720                         copylen = klen;
 721                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 722                         return -EFAULT;
 723         }
 724         return err;
 725 }
 726 EXPORT_SYMBOL(compat_mc_getsockopt);
 727
 728
 729 /* Argument list sizes for compat_sys_socketcall */
 730 #define AL(x) ((x) * sizeof(u32))
 731 static unsigned char nas[21] = {
 732         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 733         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 734         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 735         AL(4), AL(5), AL(4)
 736 };
 737 #undef AL
 738
 739 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 740 {
 741         if (flags & MSG_CMSG_COMPAT)
 742                 return -EINVAL;
 743         return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 744 }
 745
 746 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 747                                     unsigned int vlen, unsigned int flags)
 748 {
 749         if (flags & MSG_CMSG_COMPAT)
 750                 return -EINVAL;
 751         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 752                               flags | MSG_CMSG_COMPAT);
 753 }
 754
 755 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 756 {
 757         if (flags & MSG_CMSG_COMPAT)
 758                 return -EINVAL;
 759         return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 760 }
 761
 762 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
 763 {
 764         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 765 }
 766
 767 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
 768                                     unsigned int flags, struct sockaddr __user *addr,
 769                                     int __user *addrlen)
 770 {
 771         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 772 }
 773
 774 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 775                                     unsigned int vlen, unsigned int flags,
 776                                     struct compat_timespec __user *timeout)
 777 {
 778         int datagrams;
 779         struct timespec ktspec;
 780
 781         if (flags & MSG_CMSG_COMPAT)
 782                 return -EINVAL;
 783
 784         if (timeout == NULL)
 785                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 786                                       flags | MSG_CMSG_COMPAT, NULL);
 787
 788         if (compat_get_timespec(&ktspec, timeout))
 789                 return -EFAULT;
 790
 791         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 792                                    flags | MSG_CMSG_COMPAT, &ktspec);
 793         if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 794                 datagrams = -EFAULT;
 795
 796         return datagrams;
 797 }
 798
 799 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 800 {
 801         int ret;
 802         u32 a[6];
 803         u32 a0, a1;
 804
 805         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 806                 return -EINVAL;
 807         if (copy_from_user(a, args, nas[call]))
 808                 return -EFAULT;
 809         a0 = a[0];
 810         a1 = a[1];
 811
 812         switch (call) {
 813         case SYS_SOCKET:
 814                 ret = sys_socket(a0, a1, a[2]);
 815                 break;
 816         case SYS_BIND:
 817                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 818                 break;
 819         case SYS_CONNECT:
 820                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 821                 break;
 822         case SYS_LISTEN:
 823                 ret = sys_listen(a0, a1);
 824                 break;
 825         case SYS_ACCEPT:
 826                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 827                 break;
 828         case SYS_GETSOCKNAME:
 829                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 830                 break;
 831         case SYS_GETPEERNAME:
 832                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 833                 break;
 834         case SYS_SOCKETPAIR:
 835                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 836                 break;
 837         case SYS_SEND:
 838                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 839                 break;
 840         case SYS_SENDTO:
 841                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 842                 break;
 843         case SYS_RECV:
 844                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 845                 break;
 846         case SYS_RECVFROM:
 847                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 848                                           compat_ptr(a[4]), compat_ptr(a[5]));
 849                 break;
 850         case SYS_SHUTDOWN:
 851                 ret = sys_shutdown(a0, a1);
 852                 break;
 853         case SYS_SETSOCKOPT:
 854                 ret = compat_sys_setsockopt(a0, a1, a[2],
 855                                 compat_ptr(a[3]), a[4]);
 856                 break;
 857         case SYS_GETSOCKOPT:
 858                 ret = compat_sys_getsockopt(a0, a1, a[2],
 859                                 compat_ptr(a[3]), compat_ptr(a[4]));
 860                 break;
 861         case SYS_SENDMSG:
 862                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 863                 break;
 864         case SYS_SENDMMSG:
 865                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 866                 break;
 867         case SYS_RECVMSG:
 868                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 869                 break;
 870         case SYS_RECVMMSG:
 871                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 872                                           compat_ptr(a[4]));
 873                 break;
 874         case SYS_ACCEPT4:
 875                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 876                 break;
 877         default:
 878                 ret = -EINVAL;
 879                 break;
 880         }
 881         return ret;
 882 }