Security Advisory Important: kernel-rt security and bug fix update

Advisory: RHSA-2009:1081-1
Type: Security Advisory
Severity: Important
Issued on: 2009-06-03
Last updated on: 2009-06-03
Affected Products: Red Hat Enterprise MRG v1 for Red Hat Enterprise Linux (version 5)
CVEs ( CVE-2009-1072


Updated kernel-rt packages that fix several security issues and various
bugs are now available for Red Hat Enterprise MRG 1.1.3.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

The kernel-rt packages contain the Linux kernel, the core of any Linux
operating system.

These updated packages fix the following security issues:

* a buffer overflow flaw was found in the CIFSTCon() function of the Linux
kernel Common Internet File System (CIFS) implementation. When mounting a
CIFS share, a malicious server could send an overly-long string to the
client, possibly leading to a denial of service or privilege escalation on
the client mounting the CIFS share. (CVE-2009-1439, Important)

* the Linux kernel Network File System daemon (nfsd) implementation did not
drop the CAP_MKNOD capability when handling requests from local,
unprivileged users. This flaw could possibly lead to an information leak or
privilege escalation. (CVE-2009-1072, Moderate)

* a deficiency was found in the Linux kernel signals implementation. The
kill_something_info() function did not check if a process was outside the
caller's namespace before sending the kill signal, making it possible to
kill processes in all process ID (PID) namespaces, breaking PID namespace
isolation. (CVE-2009-1338, Moderate)

* a flaw was found in the AGPGART driver. The agp_generic_alloc_page() and
agp_generic_alloc_pages() functions did not zero out the memory pages they
allocate, which may later be available to user-space processes. This flaw
could possibly lead to an information leak. (CVE-2009-1192, Low)

These updated packages also fix the following bugs:

* the "-fwrapv" flag was added to the gcc build options to prevent gcc from
optimizing away wrapping arithmetic, as optimizing away wrapping may lead
to unexpected results. (BZ#491264)

* the bnx2x driver may have failed when highly-stressed by network
stress-tests, resulting in network access being unavailable. This driver
has been updated to resolve this issue. (BZ#495472)

* the file system mask, which lists capabilities for users with a file
system user ID (fsuid) of 0, was missing the CAP_MKNOD and
CAP_LINUX_IMMUTABLE capabilities. This could, potentially, allow users with
an fsuid other than 0 to perform actions on some file system types that
would otherwise be prevented. This update adds these capabilities.

* "/proc/[pid]/maps" and "/proc/[pid]/smaps" can only be read by processes
able to use the ptrace() call on a given process; however, certain
information from "/proc/[pid]/stat" and "/proc/[pid]/wchan" could be used
to reconstruct memory maps, making it possible to bypass the Address Space
Layout Randomization (ASLR) security feature. This update addresses this
issue. (BZ#499550)

* the get_random_int() function returned the same number until the jiffies
counter (which ticks at a clock interrupt frequency) or process ID (PID)
changed, making it possible to predict the random numbers. This may have
helped to bypass the ASLR security feature. With this update,
get_random_int() is more random and no longer uses a common seed value.
This reduces the possibility of predicting the values get_random_int()
returns. (BZ#499787)

All Red Hat Enterprise MRG users should upgrade to these updated packages,
which contain backported patches to resolve these issues. Note: The system
must be rebooted for this update to take effect.


Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at

Updated packages

Red Hat Enterprise MRG v1 for Red Hat Enterprise Linux (version 5)

File outdated by:  RHBA-2013:0927
    MD5: bfa220d8bc6e7aba73836f836cf9aa99
File outdated by:  RHBA-2013:0927
    MD5: c9ab138ac61d75ae90b1be612bd19967
File outdated by:  RHBA-2013:0927
    MD5: 70f3e6575de5158ba561a192033dd947
File outdated by:  RHBA-2013:0927
    MD5: 18dac40ffd703d4827fa9dd17cd85ea3
File outdated by:  RHBA-2013:0927
    MD5: 956dd3fdeb6193256a090822f50f12b9
File outdated by:  RHBA-2013:0927
    MD5: 503ced82ddcbec48bb5bdc94df732bde
File outdated by:  RHBA-2013:0927
    MD5: b93fc172e20978d579850ffe29c81d7e
File outdated by:  RHBA-2013:0927
    MD5: c3819d3f1f60733f6c49e521c917bafb
File outdated by:  RHBA-2013:0927
    MD5: 0f89cc3ef5ce3aecb946d6dddef0c970
File outdated by:  RHBA-2013:0927
    MD5: 9719977d3011c8306a488d69d99c8d6b
File outdated by:  RHBA-2013:0927
    MD5: 880180900f7304f180e39e500be5adcb
File outdated by:  RHBA-2013:0927
    MD5: a93f7fd99b835e170933d0e2f8294006
File outdated by:  RHBA-2013:0927
    MD5: dbb0f337f5893b95c66cd4c357eb3a73
File outdated by:  RHBA-2013:0927
    MD5: 65f9c74c46d54003977742d98abc7e00
File outdated by:  RHBA-2013:0927
    MD5: 503ced82ddcbec48bb5bdc94df732bde
File outdated by:  RHBA-2013:0927
    MD5: c4ba08604a82f722ecb2d7f9e169a4ee
File outdated by:  RHBA-2013:0927
    MD5: 0c39ca64453f6ea012f8263c021facb3
File outdated by:  RHBA-2013:0927
    MD5: f2b97a7e55aadf9a4351e6d12924a596
File outdated by:  RHBA-2013:0927
    MD5: 2ca310374fdcd923582176d9d495fb4d
(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

491264 - kernel-rt should be built with -fwrapv [mrg-1]
491572 - CVE-2009-1072 kernel: nfsd should drop CAP_MKNOD for non-root
494275 - CVE-2009-1439 kernel: cifs: memory overwrite when saving nativeFileSystem field during mount
495472 - [Broadcom10gb] daEth stress breaks bnx2x driver in MRG1.1
496031 - CVE-2009-1338 kernel: 'kill sig -1' must only apply to caller's pid namespace
497020 - CVE-2009-1192 kernel: agp: zero pages before sending to userspace
497047 - kernel: add some long-missing capabilities to fs_mask
499550 - kernel: proc: avoid information leaks to non-privileged processes [mrg-1]
499787 - kernel: random: make get_random_int() more random [mrg-1]


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