diff options
| -rw-r--r-- | ChangeLog | 16 | ||||
| -rw-r--r-- | NEWS | 8 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/Makefile | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/Versions | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/check_native.c | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/check_pf.c | 4 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/ifaddrs.c | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/netlink_assert_response.c | 106 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/netlinkaccess.h | 6 |
9 files changed, 145 insertions, 1 deletions
@@ -1,3 +1,19 @@ +2015-11-09 Florian Weimer <fweimer@redhat.com> + + [BZ #12926] + Terminate process on invalid netlink response. + * sysdeps/unix/sysv/linux/netlinkaccess.h + (__netlink_assert_response): Declare. + * sysdeps/unix/sysv/linux/netlink_assert_response.c: New file. + * sysdeps/unix/sysv/linux/Makefile [$(subdir) == inet] + (sysdep_routines): Add netlink_assert_response. + * sysdeps/unix/sysv/linux/check_native.c (__check_native): Call + __netlink_assert_response. + * sysdeps/unix/sysv/linux/check_pf.c (make_request): Likewise. + * sysdeps/unix/sysv/linux/ifaddrs.c (__netlink_request): Likewise. + * sysdeps/unix/sysv/linux/Versions (GLIBC_PRIVATE): Add + __netlink_assert_response. + 2015-11-07 H.J. Lu <hongjiu.lu@intel.com> [BZ #19178] @@ -11,6 +11,14 @@ Version 2.23 the following new symbols are used: fts64_children, fts64_close, fts64_open, fts64_read and fts64_set. +* getaddrinfo now detects certain invalid responses on an internal netlink + socket. If such responses are received, an affected process will + terminate with an error message of "Unexpected error <number> on netlink + descriptor <number>" or "Unexpected netlink response of size <number> on + descriptor <number>". The most likely cause for these errors is a + multi-threaded application which erroneously closes and reuses the netlink + file descriptor while it is used by getaddrinfo. + * A defect in the malloc implementation, present since glibc 2.15 (2012) or glibc 2.10 via --enable-experimental-malloc (2009), could result in the unnecessary serialization of memory allocation requests across threads. diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index 2c67a6619f..d6cc529885 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -151,6 +151,7 @@ sysdep_headers += netinet/if_fddi.h netinet/if_tr.h \ netipx/ipx.h netash/ash.h netax25/ax25.h netatalk/at.h \ netrom/netrom.h netpacket/packet.h netrose/rose.h \ neteconet/ec.h netiucv/iucv.h +sysdep_routines += netlink_assert_response endif # Don't compile the ctype glue code, since there is no old non-GNU C library. diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions index 16bb281590..202ffccc29 100644 --- a/sysdeps/unix/sysv/linux/Versions +++ b/sysdeps/unix/sysv/linux/Versions @@ -169,5 +169,7 @@ libc { GLIBC_PRIVATE { # functions used in other libraries __syscall_rt_sigqueueinfo; + # functions used by nscd + __netlink_assert_response; } } diff --git a/sysdeps/unix/sysv/linux/check_native.c b/sysdeps/unix/sysv/linux/check_native.c index eaefca10e4..d04c8f2a1f 100644 --- a/sysdeps/unix/sysv/linux/check_native.c +++ b/sysdeps/unix/sysv/linux/check_native.c @@ -35,6 +35,7 @@ #include <not-cancel.h> +#include "netlinkaccess.h" void __check_native (uint32_t a1_index, int *a1_native, @@ -117,6 +118,7 @@ __check_native (uint32_t a1_index, int *a1_native, }; ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0)); + __netlink_assert_response (fd, read_len); if (read_len < 0) goto out_fail; diff --git a/sysdeps/unix/sysv/linux/check_pf.c b/sysdeps/unix/sysv/linux/check_pf.c index f072fb3de7..af4fdf8d9a 100644 --- a/sysdeps/unix/sysv/linux/check_pf.c +++ b/sysdeps/unix/sysv/linux/check_pf.c @@ -36,6 +36,7 @@ #include <atomic.h> #include <nscd/nscd-client.h> +#include "netlinkaccess.h" #ifndef IFA_F_HOMEADDRESS # define IFA_F_HOMEADDRESS 0 @@ -164,7 +165,8 @@ make_request (int fd, pid_t pid) }; ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0)); - if (read_len <= 0) + __netlink_assert_response (fd, read_len); + if (read_len < 0) goto out_fail; if (msg.msg_flags & MSG_TRUNC) diff --git a/sysdeps/unix/sysv/linux/ifaddrs.c b/sysdeps/unix/sysv/linux/ifaddrs.c index 64b4a1c859..768a7ed798 100644 --- a/sysdeps/unix/sysv/linux/ifaddrs.c +++ b/sysdeps/unix/sysv/linux/ifaddrs.c @@ -168,6 +168,7 @@ __netlink_request (struct netlink_handle *h, int type) }; read_len = TEMP_FAILURE_RETRY (__recvmsg (h->fd, &msg, 0)); + __netlink_assert_response (h->fd, read_len); if (read_len < 0) goto out_fail; diff --git a/sysdeps/unix/sysv/linux/netlink_assert_response.c b/sysdeps/unix/sysv/linux/netlink_assert_response.c new file mode 100644 index 0000000000..b570e93db8 --- /dev/null +++ b/sysdeps/unix/sysv/linux/netlink_assert_response.c @@ -0,0 +1,106 @@ +/* Check recvmsg results for netlink sockets. + Copyright (C) 2015 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <sys/socket.h> + +#include "netlinkaccess.h" + +static int +get_address_family (int fd) +{ + struct sockaddr_storage sa; + socklen_t sa_len = sizeof (sa); + if (__getsockname (fd, (struct sockaddr *) &sa, &sa_len) < 0) + return -1; + /* Check that the socket family number is preserved despite in-band + signaling. */ + _Static_assert (sizeof (sa.ss_family) < sizeof (int), "address family size"); + _Static_assert (0 < (__typeof__ (sa.ss_family)) -1, + "address family unsigned"); + return sa.ss_family; +} + +void +internal_function +__netlink_assert_response (int fd, ssize_t result) +{ + if (result < 0) + { + /* Check if the error is unexpected. */ + bool terminate = false; + int error_code = errno; + int family = get_address_family (fd); + if (family != AF_NETLINK) + /* If the address family does not match (or getsockname + failed), report the original error. */ + terminate = true; + else if (error_code == EBADF + || error_code == ENOTCONN + || error_code == ENOTSOCK + || error_code == ECONNREFUSED) + /* These errors indicate that the descriptor is not a + connected socket. */ + terminate = true; + else if (error_code == EAGAIN || error_code == EWOULDBLOCK) + { + /* The kernel might return EAGAIN for other reasons than a + non-blocking socket. But if the socket is not blocking, + it is not ours, so report the error. */ + int mode = __fcntl (fd, F_GETFL, 0); + if (mode < 0 || (mode & O_NONBLOCK) != 0) + terminate = true; + } + if (terminate) + { + char message[200]; + if (family < 0) + __snprintf (message, sizeof (message), + "Unexpected error %d on netlink descriptor %d", + error_code, fd); + else + __snprintf (message, sizeof (message), + "Unexpected error %d on netlink descriptor %d" + " (address family %d)", + error_code, fd, family); + __libc_fatal (message); + } + else + /* Restore orignal errno value. */ + __set_errno (error_code); + } + else if (result < sizeof (struct nlmsghdr)) + { + char message[200]; + int family = get_address_family (fd); + if (family < 0) + __snprintf (message, sizeof (message), + "Unexpected netlink response of size %zd" + " on descriptor %d", + result, fd); + else + __snprintf (message, sizeof (message), + "Unexpected netlink response of size %zd" + " on descriptor %d (address family %d)", + result, fd, family); + __libc_fatal (message); + } +} +libc_hidden_def (__netlink_assert_response) diff --git a/sysdeps/unix/sysv/linux/netlinkaccess.h b/sysdeps/unix/sysv/linux/netlinkaccess.h index c204b67a20..01ac35c641 100644 --- a/sysdeps/unix/sysv/linux/netlinkaccess.h +++ b/sysdeps/unix/sysv/linux/netlinkaccess.h @@ -19,6 +19,7 @@ #define _NETLINKACCESS_H 1 #include <stdint.h> +#include <sys/types.h> #include <asm/types.h> #include <linux/netlink.h> #include <linux/rtnetlink.h> @@ -48,5 +49,10 @@ extern void __netlink_close (struct netlink_handle *h); extern void __netlink_free_handle (struct netlink_handle *h); extern int __netlink_request (struct netlink_handle *h, int type); +/* Terminate the process if RESULT is an invalid recvmsg result for + the netlink socket FD. */ +void __netlink_assert_response (int fd, ssize_t result) + internal_function; +libc_hidden_proto (__netlink_assert_response) #endif /* netlinkaccess.h */ |