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/audit.h>
  26 #include <linux/export.h>
  27
  28 #include <net/scm.h>
  29 #include <net/sock.h>
  30 #include <net/ip.h>
  31 #include <net/ipv6.h>
  32 #include <linux/uaccess.h>
  33 #include <net/compat.h>
  34
  35 int get_compat_msghdr(struct msghdr *kmsg,
  36                       struct compat_msghdr __user *umsg,
  37                       struct sockaddr __user **save_addr,
  38                       struct iovec **iov)
  39 {
  40         struct compat_msghdr msg;
  41         ssize_t err;
  42
  43         if (copy_from_user(&msg, umsg, sizeof(*umsg)))
  44                 return -EFAULT;
  45
  46         kmsg->msg_flags = msg.msg_flags;
  47         kmsg->msg_namelen = msg.msg_namelen;
  48
  49         if (!msg.msg_name)
  50                 kmsg->msg_namelen = 0;
  51
  52         if (kmsg->msg_namelen < 0)
  53                 return -EINVAL;
  54
  55         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  56                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  57
  58         kmsg->msg_control = compat_ptr(msg.msg_control);
  59         kmsg->msg_controllen = msg.msg_controllen;
  60
  61         if (save_addr)
  62                 *save_addr = compat_ptr(msg.msg_name);
  63
  64         if (msg.msg_name && kmsg->msg_namelen) {
  65                 if (!save_addr) {
  66                         err = move_addr_to_kernel(compat_ptr(msg.msg_name),
  67                                                   kmsg->msg_namelen,
  68                                                   kmsg->msg_name);
  69                         if (err < 0)
  70                                 return err;
  71                 }
  72         } else {
  73                 kmsg->msg_name = NULL;
  74                 kmsg->msg_namelen = 0;
  75         }
  76
  77         if (msg.msg_iovlen > UIO_MAXIOV)
  78                 return -EMSGSIZE;
  79
  80         kmsg->msg_iocb = NULL;
  81
  82         return compat_import_iovec(save_addr ? READ : WRITE,
  83                                    compat_ptr(msg.msg_iov), msg.msg_iovlen,
  84                                    UIO_FASTIOV, iov, &kmsg->msg_iter);
  85 }
  86
  87 /* Bleech... */
  88 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
  89
  90 #define CMSG_COMPAT_DATA(cmsg)                          \
  91         ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
  92 #define CMSG_COMPAT_SPACE(len)                          \
  93         (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
  94 #define CMSG_COMPAT_LEN(len)                            \
  95         (sizeof(struct compat_cmsghdr) + (len))
  96
  97 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
  98         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
  99          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 100          (struct compat_cmsghdr __user *)NULL)
 101
 102 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 103         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 104          (ucmlen) <= (unsigned long) \
 105          ((mhdr)->msg_controllen - \
 106           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 107
 108 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 109                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 110 {
 111         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 112         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 113                         msg->msg_controllen)
 114                 return NULL;
 115         return (struct compat_cmsghdr __user *)ptr;
 116 }
 117
 118 /* There is a lot of hair here because the alignment rules (and
 119  * thus placement) of cmsg headers and length are different for
 120  * 32-bit apps.  -DaveM
 121  */
 122 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 123                                unsigned char *stackbuf, int stackbuf_size)
 124 {
 125         struct compat_cmsghdr __user *ucmsg;
 126         struct cmsghdr *kcmsg, *kcmsg_base;
 127         compat_size_t ucmlen;
 128         __kernel_size_t kcmlen, tmp;
 129         int err = -EFAULT;
 130
 131         BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
 132                      CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
 133
 134         kcmlen = 0;
 135         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 136         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 137         while (ucmsg != NULL) {
 138                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 139                         return -EFAULT;
 140
 141                 /* Catch bogons. */
 142                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 143                         return -EINVAL;
 144
 145                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 146                 tmp = CMSG_ALIGN(tmp);
 147                 kcmlen += tmp;
 148                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 149         }
 150         if (kcmlen == 0)
 151                 return -EINVAL;
 152
 153         /* The kcmlen holds the 64-bit version of the control length.
 154          * It may not be modified as we do not stick it into the kmsg
 155          * until we have successfully copied over all of the data
 156          * from the user.
 157          */
 158         if (kcmlen > stackbuf_size)
 159                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 160         if (kcmsg == NULL)
 161                 return -ENOBUFS;
 162
 163         /* Now copy them over neatly. */
 164         memset(kcmsg, 0, kcmlen);
 165         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 166         while (ucmsg != NULL) {
 167                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 168                         goto Efault;
 169                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 170                         goto Einval;
 171                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 172                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 173                         goto Einval;
 174                 kcmsg->cmsg_len = tmp;
 175                 tmp = CMSG_ALIGN(tmp);
 176                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 177                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 178                     copy_from_user(CMSG_DATA(kcmsg),
 179                                    CMSG_COMPAT_DATA(ucmsg),
 180                                    (ucmlen - sizeof(*ucmsg))))
 181                         goto Efault;
 182
 183                 /* Advance. */
 184                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 185                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 186         }
 187
 188         /*
 189          * check the length of messages copied in is the same as the
 190          * what we get from the first loop
 191          */
 192         if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
 193                 goto Einval;
 194
 195         /* Ok, looks like we made it.  Hook it up and return success. */
 196         kmsg->msg_control = kcmsg_base;
 197         kmsg->msg_controllen = kcmlen;
 198         return 0;
 199
 200 Einval:
 201         err = -EINVAL;
 202 Efault:
 203         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 204                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 205         return err;
 206 }
 207
 208 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 209 {
 210         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 211         struct compat_cmsghdr cmhdr;
 212         struct compat_timeval ctv;
 213         struct compat_timespec cts[3];
 214         int cmlen;
 215
 216         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 217                 kmsg->msg_flags |= MSG_CTRUNC;
 218                 return 0; /* XXX: return error? check spec. */
 219         }
 220
 221         if (!COMPAT_USE_64BIT_TIME) {
 222                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 223                         struct timeval *tv = (struct timeval *)data;
 224                         ctv.tv_sec = tv->tv_sec;
 225                         ctv.tv_usec = tv->tv_usec;
 226                         data = &ctv;
 227                         len = sizeof(ctv);
 228                 }
 229                 if (level == SOL_SOCKET &&
 230                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 231                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 232                         int i;
 233                         struct timespec *ts = (struct timespec *)data;
 234                         for (i = 0; i < count; i++) {
 235                                 cts[i].tv_sec = ts[i].tv_sec;
 236                                 cts[i].tv_nsec = ts[i].tv_nsec;
 237                         }
 238                         data = &cts;
 239                         len = sizeof(cts[0]) * count;
 240                 }
 241         }
 242
 243         cmlen = CMSG_COMPAT_LEN(len);
 244         if (kmsg->msg_controllen < cmlen) {
 245                 kmsg->msg_flags |= MSG_CTRUNC;
 246                 cmlen = kmsg->msg_controllen;
 247         }
 248         cmhdr.cmsg_level = level;
 249         cmhdr.cmsg_type = type;
 250         cmhdr.cmsg_len = cmlen;
 251
 252         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 253                 return -EFAULT;
 254         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 255                 return -EFAULT;
 256         cmlen = CMSG_COMPAT_SPACE(len);
 257         if (kmsg->msg_controllen < cmlen)
 258                 cmlen = kmsg->msg_controllen;
 259         kmsg->msg_control += cmlen;
 260         kmsg->msg_controllen -= cmlen;
 261         return 0;
 262 }
 263
 264 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 265 {
 266         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 267         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 268         int fdnum = scm->fp->count;
 269         struct file **fp = scm->fp->fp;
 270         int __user *cmfptr;
 271         int err = 0, i;
 272
 273         if (fdnum < fdmax)
 274                 fdmax = fdnum;
 275
 276         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 277                 int new_fd;
 278                 err = security_file_receive(fp[i]);
 279                 if (err)
 280                         break;
 281                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 282                                           ? O_CLOEXEC : 0);
 283                 if (err < 0)
 284                         break;
 285                 new_fd = err;
 286                 err = put_user(new_fd, cmfptr);
 287                 if (err) {
 288                         put_unused_fd(new_fd);
 289                         break;
 290                 }
 291                 /* Bump the usage count and install the file. */
 292                 fd_install(new_fd, get_file(fp[i]));
 293         }
 294
 295         if (i > 0) {
 296                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 297                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 298                 if (!err)
 299                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 300                 if (!err)
 301                         err = put_user(cmlen, &cm->cmsg_len);
 302                 if (!err) {
 303                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 304                         kmsg->msg_control += cmlen;
 305                         kmsg->msg_controllen -= cmlen;
 306                 }
 307         }
 308         if (i < fdnum)
 309                 kmsg->msg_flags |= MSG_CTRUNC;
 310
 311         /*
 312          * All of the files that fit in the message have had their
 313          * usage counts incremented, so we just free the list.
 314          */
 315         __scm_destroy(scm);
 316 }
 317
 318 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
 319 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
 320 {
 321         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 322         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 323         struct compat_sock_fprog f32;
 324         struct sock_fprog f;
 325
 326         if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
 327                 return NULL;
 328         memset(&f, 0, sizeof(f));
 329         f.len = f32.len;
 330         f.filter = compat_ptr(f32.filter);
 331         if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
 332                 return NULL;
 333
 334         return kfprog;
 335 }
 336 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
 337
 338 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 339                                 char __user *optval, unsigned int optlen)
 340 {
 341         struct sock_fprog __user *kfprog;
 342
 343         kfprog = get_compat_bpf_fprog(optval);
 344         if (!kfprog)
 345                 return -EFAULT;
 346
 347         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 348                               sizeof(struct sock_fprog));
 349 }
 350
 351 static int do_set_sock_timeout(struct socket *sock, int level,
 352                 int optname, char __user *optval, unsigned int optlen)
 353 {
 354         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 355         struct timeval ktime;
 356         mm_segment_t old_fs;
 357         int err;
 358
 359         if (optlen < sizeof(*up))
 360                 return -EINVAL;
 361         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 362             __get_user(ktime.tv_sec, &up->tv_sec) ||
 363             __get_user(ktime.tv_usec, &up->tv_usec))
 364                 return -EFAULT;
 365         old_fs = get_fs();
 366         set_fs(KERNEL_DS);
 367         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 368         set_fs(old_fs);
 369
 370         return err;
 371 }
 372
 373 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 374                                 char __user *optval, unsigned int optlen)
 375 {
 376         if (optname == SO_ATTACH_FILTER ||
 377             optname == SO_ATTACH_REUSEPORT_CBPF)
 378                 return do_set_attach_filter(sock, level, optname,
 379                                             optval, optlen);
 380         if (!COMPAT_USE_64BIT_TIME &&
 381             (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 static int __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 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 415                        char __user *, optval, unsigned int, optlen)
 416 {
 417         return __compat_sys_setsockopt(fd, level, optname, optval, optlen);
 418 }
 419
 420 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 421                 char __user *optval, int __user *optlen)
 422 {
 423         struct compat_timeval __user *up;
 424         struct timeval ktime;
 425         mm_segment_t old_fs;
 426         int len, err;
 427
 428         up = (struct compat_timeval __user *) optval;
 429         if (get_user(len, optlen))
 430                 return -EFAULT;
 431         if (len < sizeof(*up))
 432                 return -EINVAL;
 433         len = sizeof(ktime);
 434         old_fs = get_fs();
 435         set_fs(KERNEL_DS);
 436         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 437         set_fs(old_fs);
 438
 439         if (!err) {
 440                 if (put_user(sizeof(*up), optlen) ||
 441                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 442                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 443                     __put_user(ktime.tv_usec, &up->tv_usec))
 444                         err = -EFAULT;
 445         }
 446         return err;
 447 }
 448
 449 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 450                                 char __user *optval, int __user *optlen)
 451 {
 452         if (!COMPAT_USE_64BIT_TIME &&
 453             (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
 454                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 455         return sock_getsockopt(sock, level, optname, optval, optlen);
 456 }
 457
 458 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 459 {
 460         struct compat_timeval __user *ctv;
 461         int err;
 462         struct timeval tv;
 463
 464         if (COMPAT_USE_64BIT_TIME)
 465                 return sock_get_timestamp(sk, userstamp);
 466
 467         ctv = (struct compat_timeval __user *) userstamp;
 468         err = -ENOENT;
 469         sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 470         tv = ktime_to_timeval(sk->sk_stamp);
 471         if (tv.tv_sec == -1)
 472                 return err;
 473         if (tv.tv_sec == 0) {
 474                 sk->sk_stamp = ktime_get_real();
 475                 tv = ktime_to_timeval(sk->sk_stamp);
 476         }
 477         err = 0;
 478         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 479                         put_user(tv.tv_usec, &ctv->tv_usec))
 480                 err = -EFAULT;
 481         return err;
 482 }
 483 EXPORT_SYMBOL(compat_sock_get_timestamp);
 484
 485 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 486 {
 487         struct compat_timespec __user *ctv;
 488         int err;
 489         struct timespec ts;
 490
 491         if (COMPAT_USE_64BIT_TIME)
 492                 return sock_get_timestampns (sk, userstamp);
 493
 494         ctv = (struct compat_timespec __user *) userstamp;
 495         err = -ENOENT;
 496         sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 497         ts = ktime_to_timespec(sk->sk_stamp);
 498         if (ts.tv_sec == -1)
 499                 return err;
 500         if (ts.tv_sec == 0) {
 501                 sk->sk_stamp = ktime_get_real();
 502                 ts = ktime_to_timespec(sk->sk_stamp);
 503         }
 504         err = 0;
 505         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 506                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 507                 err = -EFAULT;
 508         return err;
 509 }
 510 EXPORT_SYMBOL(compat_sock_get_timestampns);
 511
 512 static int __compat_sys_getsockopt(int fd, int level, int optname,
 513                                    char __user *optval,
 514                                    int __user *optlen)
 515 {
 516         int err;
 517         struct socket *sock = sockfd_lookup(fd, &err);
 518
 519         if (sock) {
 520                 err = security_socket_getsockopt(sock, level, optname);
 521                 if (err) {
 522                         sockfd_put(sock);
 523                         return err;
 524                 }
 525
 526                 if (level == SOL_SOCKET)
 527                         err = compat_sock_getsockopt(sock, level,
 528                                         optname, optval, optlen);
 529                 else if (sock->ops->compat_getsockopt)
 530                         err = sock->ops->compat_getsockopt(sock, level,
 531                                         optname, optval, optlen);
 532                 else
 533                         err = sock->ops->getsockopt(sock, level,
 534                                         optname, optval, optlen);
 535                 sockfd_put(sock);
 536         }
 537         return err;
 538 }
 539
 540 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 541                        char __user *, optval, int __user *, optlen)
 542 {
 543         return __compat_sys_getsockopt(fd, level, optname, optval, optlen);
 544 }
 545
 546 struct compat_group_req {
 547         __u32                            gr_interface;
 548         struct __kernel_sockaddr_storage gr_group
 549                 __aligned(4);
 550 } __packed;
 551
 552 struct compat_group_source_req {
 553         __u32                            gsr_interface;
 554         struct __kernel_sockaddr_storage gsr_group
 555                 __aligned(4);
 556         struct __kernel_sockaddr_storage gsr_source
 557                 __aligned(4);
 558 } __packed;
 559
 560 struct compat_group_filter {
 561         __u32                            gf_interface;
 562         struct __kernel_sockaddr_storage gf_group
 563                 __aligned(4);
 564         __u32                            gf_fmode;
 565         __u32                            gf_numsrc;
 566         struct __kernel_sockaddr_storage gf_slist[1]
 567                 __aligned(4);
 568 } __packed;
 569
 570 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 571                         sizeof(struct __kernel_sockaddr_storage))
 572
 573
 574 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 575         char __user *optval, unsigned int optlen,
 576         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 577 {
 578         char __user     *koptval = optval;
 579         int             koptlen = optlen;
 580
 581         switch (optname) {
 582         case MCAST_JOIN_GROUP:
 583         case MCAST_LEAVE_GROUP:
 584         {
 585                 struct compat_group_req __user *gr32 = (void *)optval;
 586                 struct group_req __user *kgr =
 587                         compat_alloc_user_space(sizeof(struct group_req));
 588                 u32 interface;
 589
 590                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 591                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 592                     __get_user(interface, &gr32->gr_interface) ||
 593                     __put_user(interface, &kgr->gr_interface) ||
 594                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 595                                 sizeof(kgr->gr_group)))
 596                         return -EFAULT;
 597                 koptval = (char __user *)kgr;
 598                 koptlen = sizeof(struct group_req);
 599                 break;
 600         }
 601         case MCAST_JOIN_SOURCE_GROUP:
 602         case MCAST_LEAVE_SOURCE_GROUP:
 603         case MCAST_BLOCK_SOURCE:
 604         case MCAST_UNBLOCK_SOURCE:
 605         {
 606                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 607                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 608                         sizeof(struct group_source_req));
 609                 u32 interface;
 610
 611                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 612                     !access_ok(VERIFY_WRITE, kgsr,
 613                         sizeof(struct group_source_req)) ||
 614                     __get_user(interface, &gsr32->gsr_interface) ||
 615                     __put_user(interface, &kgsr->gsr_interface) ||
 616                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 617                                 sizeof(kgsr->gsr_group)) ||
 618                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 619                                 sizeof(kgsr->gsr_source)))
 620                         return -EFAULT;
 621                 koptval = (char __user *)kgsr;
 622                 koptlen = sizeof(struct group_source_req);
 623                 break;
 624         }
 625         case MCAST_MSFILTER:
 626         {
 627                 struct compat_group_filter __user *gf32 = (void *)optval;
 628                 struct group_filter __user *kgf;
 629                 u32 interface, fmode, numsrc;
 630
 631                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 632                     __get_user(interface, &gf32->gf_interface) ||
 633                     __get_user(fmode, &gf32->gf_fmode) ||
 634                     __get_user(numsrc, &gf32->gf_numsrc))
 635                         return -EFAULT;
 636                 koptlen = optlen + sizeof(struct group_filter) -
 637                                 sizeof(struct compat_group_filter);
 638                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 639                         return -EINVAL;
 640                 kgf = compat_alloc_user_space(koptlen);
 641                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 642                     __put_user(interface, &kgf->gf_interface) ||
 643                     __put_user(fmode, &kgf->gf_fmode) ||
 644                     __put_user(numsrc, &kgf->gf_numsrc) ||
 645                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 646                                 sizeof(kgf->gf_group)) ||
 647                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 648                                 numsrc * sizeof(kgf->gf_slist[0]))))
 649                         return -EFAULT;
 650                 koptval = (char __user *)kgf;
 651                 break;
 652         }
 653
 654         default:
 655                 break;
 656         }
 657         return setsockopt(sock, level, optname, koptval, koptlen);
 658 }
 659 EXPORT_SYMBOL(compat_mc_setsockopt);
 660
 661 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 662         char __user *optval, int __user *optlen,
 663         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 664 {
 665         struct compat_group_filter __user *gf32 = (void *)optval;
 666         struct group_filter __user *kgf;
 667         int __user      *koptlen;
 668         u32 interface, fmode, numsrc;
 669         int klen, ulen, err;
 670
 671         if (optname != MCAST_MSFILTER)
 672                 return getsockopt(sock, level, optname, optval, optlen);
 673
 674         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 675         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 676             __get_user(ulen, optlen))
 677                 return -EFAULT;
 678
 679         /* adjust len for pad */
 680         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 681
 682         if (klen < GROUP_FILTER_SIZE(0))
 683                 return -EINVAL;
 684
 685         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 686             __put_user(klen, koptlen))
 687                 return -EFAULT;
 688
 689         /* have to allow space for previous compat_alloc_user_space, too */
 690         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 691
 692         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 693             __get_user(interface, &gf32->gf_interface) ||
 694             __get_user(fmode, &gf32->gf_fmode) ||
 695             __get_user(numsrc, &gf32->gf_numsrc) ||
 696             __put_user(interface, &kgf->gf_interface) ||
 697             __put_user(fmode, &kgf->gf_fmode) ||
 698             __put_user(numsrc, &kgf->gf_numsrc) ||
 699             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 700                 return -EFAULT;
 701
 702         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 703         if (err)
 704                 return err;
 705
 706         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 707             __get_user(klen, koptlen))
 708                 return -EFAULT;
 709
 710         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 711
 712         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 713             __put_user(ulen, optlen))
 714                 return -EFAULT;
 715
 716         if (!access_ok(VERIFY_READ, kgf, klen) ||
 717             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 718             __get_user(interface, &kgf->gf_interface) ||
 719             __get_user(fmode, &kgf->gf_fmode) ||
 720             __get_user(numsrc, &kgf->gf_numsrc) ||
 721             __put_user(interface, &gf32->gf_interface) ||
 722             __put_user(fmode, &gf32->gf_fmode) ||
 723             __put_user(numsrc, &gf32->gf_numsrc))
 724                 return -EFAULT;
 725         if (numsrc) {
 726                 int copylen;
 727
 728                 klen -= GROUP_FILTER_SIZE(0);
 729                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 730                 if (copylen > klen)
 731                         copylen = klen;
 732                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 733                         return -EFAULT;
 734         }
 735         return err;
 736 }
 737 EXPORT_SYMBOL(compat_mc_getsockopt);
 738
 739
 740 /* Argument list sizes for compat_sys_socketcall */
 741 #define AL(x) ((x) * sizeof(u32))
 742 static unsigned char nas[21] = {
 743         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 744         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 745         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 746         AL(4), AL(5), AL(4)
 747 };
 748 #undef AL
 749
 750 static inline long __compat_sys_sendmsg(int fd,
 751                                         struct compat_msghdr __user *msg,
 752                                         unsigned int flags)
 753 {
 754         return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
 755                              flags | MSG_CMSG_COMPAT, false);
 756 }
 757
 758 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
 759                        unsigned int, flags)
 760 {
 761         return __compat_sys_sendmsg(fd, msg, flags);
 762 }
 763
 764 static inline long __compat_sys_sendmmsg(int fd,
 765                                          struct compat_mmsghdr __user *mmsg,
 766                                          unsigned int vlen, unsigned int flags)
 767 {
 768         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 769                               flags | MSG_CMSG_COMPAT, false);
 770 }
 771
 772 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 773                        unsigned int, vlen, unsigned int, flags)
 774 {
 775         return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
 776 }
 777
 778 static inline long __compat_sys_recvmsg(int fd,
 779                                         struct compat_msghdr __user *msg,
 780                                         unsigned int flags)
 781 {
 782         return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
 783                              flags | MSG_CMSG_COMPAT, false);
 784 }
 785
 786 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
 787                        unsigned int, flags)
 788 {
 789         return __compat_sys_recvmsg(fd, msg, flags);
 790 }
 791
 792 static inline long __compat_sys_recvfrom(int fd, void __user *buf,
 793                                          compat_size_t len, unsigned int flags,
 794                                          struct sockaddr __user *addr,
 795                                          int __user *addrlen)
 796 {
 797         return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
 798                               addrlen);
 799 }
 800
 801 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 802 {
 803         return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
 804 }
 805
 806 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 807                        unsigned int, flags, struct sockaddr __user *, addr,
 808                        int __user *, addrlen)
 809 {
 810         return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
 811 }
 812
 813 static int __compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 814                                  unsigned int vlen, unsigned int flags,
 815                                  struct compat_timespec __user *timeout)
 816 {
 817         int datagrams;
 818         struct timespec ktspec;
 819
 820         if (timeout == NULL)
 821                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 822                                       flags | MSG_CMSG_COMPAT, NULL);
 823
 824         if (compat_get_timespec(&ktspec, timeout))
 825                 return -EFAULT;
 826
 827         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 828                                    flags | MSG_CMSG_COMPAT, &ktspec);
 829         if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 830                 datagrams = -EFAULT;
 831
 832         return datagrams;
 833 }
 834
 835 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 836                        unsigned int, vlen, unsigned int, flags,
 837                        struct compat_timespec __user *, timeout)
 838 {
 839         return __compat_sys_recvmmsg(fd, mmsg, vlen, flags, timeout);
 840 }
 841
 842 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 843 {
 844         u32 a[AUDITSC_ARGS];
 845         unsigned int len;
 846         u32 a0, a1;
 847         int ret;
 848
 849         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 850                 return -EINVAL;
 851         len = nas[call];
 852         if (len > sizeof(a))
 853                 return -EINVAL;
 854
 855         if (copy_from_user(a, args, len))
 856                 return -EFAULT;
 857
 858         ret = audit_socketcall_compat(len / sizeof(a[0]), a);
 859         if (ret)
 860                 return ret;
 861
 862         a0 = a[0];
 863         a1 = a[1];
 864
 865         switch (call) {
 866         case SYS_SOCKET:
 867                 ret = __sys_socket(a0, a1, a[2]);
 868                 break;
 869         case SYS_BIND:
 870                 ret = __sys_bind(a0, compat_ptr(a1), a[2]);
 871                 break;
 872         case SYS_CONNECT:
 873                 ret = __sys_connect(a0, compat_ptr(a1), a[2]);
 874                 break;
 875         case SYS_LISTEN:
 876                 ret = __sys_listen(a0, a1);
 877                 break;
 878         case SYS_ACCEPT:
 879                 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 880                 break;
 881         case SYS_GETSOCKNAME:
 882                 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 883                 break;
 884         case SYS_GETPEERNAME:
 885                 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 886                 break;
 887         case SYS_SOCKETPAIR:
 888                 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 889                 break;
 890         case SYS_SEND:
 891                 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
 892                 break;
 893         case SYS_SENDTO:
 894                 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
 895                                    compat_ptr(a[4]), a[5]);
 896                 break;
 897         case SYS_RECV:
 898                 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 899                                             NULL, NULL);
 900                 break;
 901         case SYS_RECVFROM:
 902                 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 903                                             compat_ptr(a[4]),
 904                                             compat_ptr(a[5]));
 905                 break;
 906         case SYS_SHUTDOWN:
 907                 ret = __sys_shutdown(a0, a1);
 908                 break;
 909         case SYS_SETSOCKOPT:
 910                 ret = __compat_sys_setsockopt(a0, a1, a[2],
 911                                               compat_ptr(a[3]), a[4]);
 912                 break;
 913         case SYS_GETSOCKOPT:
 914                 ret = __compat_sys_getsockopt(a0, a1, a[2],
 915                                               compat_ptr(a[3]),
 916                                               compat_ptr(a[4]));
 917                 break;
 918         case SYS_SENDMSG:
 919                 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 920                 break;
 921         case SYS_SENDMMSG:
 922                 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 923                 break;
 924         case SYS_RECVMSG:
 925                 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 926                 break;
 927         case SYS_RECVMMSG:
 928                 ret = __compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 929                                             compat_ptr(a[4]));
 930                 break;
 931         case SYS_ACCEPT4:
 932                 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 933                 break;
 934         default:
 935                 ret = -EINVAL;
 936                 break;
 937         }
 938         return ret;
 939 }