diff options
| author | Florian Weimer <fweimer@redhat.com> | 2015-11-09 12:48:41 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2015-11-09 12:48:41 +0100 |
| commit | 2eecc8afd02d8c65cf098cbae4de87f332dc21bd (patch) | |
| tree | a36cb50020b3836a379e515af5d1874d8d8ea92f /NEWS | |
| parent | f3d18efb8a720121066dc3401e822043beb98cde (diff) | |
Terminate process on invalid netlink response from kernel [BZ #12926]
The recvmsg system calls for netlink sockets have been particularly
prone to picking up unrelated data after a file descriptor race
(where the descriptor is closed and reopened concurrently in a
multi-threaded process, as the result of a file descriptor
management issue elsewhere). This commit adds additional error
checking and aborts the process if a datagram of unexpected length
(without the netlink header) is received, or an error code which
cannot happen due to the way the netlink socket is used.
[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.
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 8 |
1 files changed, 8 insertions, 0 deletions
@@ -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. |