=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2009:1106-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2009-1106.html
Issue date:        2009-06-16
CVE Names:         CVE-2009-1072 CVE-2009-1192 CVE-2009-1439 
                   CVE-2009-1630 CVE-2009-1633 CVE-2009-1758 
=====================================================================

1. Summary:

Updated kernel packages that fix several security issues and several bugs
are now available for Red Hat Enterprise Linux 5.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, noarch, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, noarch, ppc, s390x, x86_64

3. Description:

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

Security fixes:

* several flaws were found in the way the Linux kernel CIFS implementation
handles Unicode strings. CIFS clients convert Unicode strings sent by a
server to their local character sets, and then write those strings into
memory. If a malicious server sent a long enough string, it could write
past the end of the target memory region and corrupt other memory areas,
possibly leading to a denial of service or privilege escalation on the
client mounting the CIFS share. (CVE-2009-1439, CVE-2009-1633, 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)

* Frank Filz reported the NFSv4 client was missing a file permission check
for the execute bit in some situations. This could allow local,
unprivileged users to run non-executable files on NFSv4 mounted file
systems. (CVE-2009-1630, Moderate)

* a missing check was found in the hypervisor_callback() function in the
Linux kernel provided by the kernel-xen package. This could cause a denial
of service of a 32-bit guest if an application running in that guest
accesses a certain memory location in the kernel. (CVE-2009-1758, 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)

Bug fixes:

* a race in the NFS client between destroying cached access rights and
unmounting an NFS file system could have caused a system crash. "Busy
inodes" messages may have been logged. (BZ#498653)

* nanosleep() could sleep several milliseconds less than the specified time
on Intel Itanium®-based systems. (BZ#500349)

* LEDs for disk drives in AHCI mode may have displayed a fault state when
there were no faults. (BZ#500120)

* ptrace_do_wait() reported tasks were stopped each time the process doing
the trace called wait(), instead of reporting it once. (BZ#486945)

* epoll_wait() may have caused a system lockup and problems for
applications. (BZ#497322)

* missing capabilities could possibly allow users with an fsuid other than
0 to perform actions on some file system types that would otherwise be
prevented. (BZ#497271)

* on NFS mounted file systems, heavy write loads may have blocked
nfs_getattr() for long periods, causing commands that use stat(2), such as
ls, to hang. (BZ#486926)

* in rare circumstances, if an application performed multiple O_DIRECT
reads per virtual memory page and also performed fork(2), the buffer
storing the result of the I/O may have ended up with invalid data.
(BZ#486921)

* when using GFS2, gfs2_quotad may have entered an uninterpretable sleep
state. (BZ#501742)

* with this update, get_random_int() is more random and no longer uses a
common seed value, reducing the possibility of predicting the values
returned. (BZ#499783)

* the "-fwrapv" flag was added to the gcc build options to prevent gcc from
optimizing away wrapping. (BZ#501751)

* a kernel panic when enabling and disabling iSCSI paths. (BZ#502916)

* using the Broadcom NetXtreme BCM5704 network device with the tg3 driver
caused high system load and very bad performance. (BZ#502837)

* "/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. (BZ#499546)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

4. Solution:

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
http://kbase.redhat.com/faq/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

486921 - Corruption on ext3/xfs with O_DIRECT and unaligned user buffers
486926 - [RHEL5.2] nfs_getattr() hangs during heavy write workloads
486945 - waitpid() reports stopped process more than once
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
496572 - CVE-2009-1633 kernel: cifs: fix potential buffer overruns when converting unicode strings sent by server
497020 - CVE-2009-1192 kernel: agp: zero pages before sending to userspace
497322 - crm #1896100 port epoll_wait fix from RHSA-2008-0665 to RHEL 5
498653 - fault in iget() - suspected race between nfs_access_cache_shrinker() and umount - Ref.: Bug #433249
499546 - kernel: proc: avoid information leaks to non-privileged processes [rhel-5.3.z]
499783 - kernel: random: make get_random_int() more random [rhel-5.3.z]
500120 - Problem with drive status leds after update to 2.6.18-128.el5
500297 - CVE-2009-1630 kernel: nfs: fix NFS v4 client handling of MAY_EXEC in nfs_permission
500349 - RHEL5.3.z LTP nanosleep02 Test Case Failure on Fujitsu Machine
500945 - CVE-2009-1758 kernel: xen: local denial of service
501742 - GFS2: gfs2_quotad in uninterruptible sleep while idle
501751 - kernel should be built with -fwrapv [rhel-5.3.z]
502837 - BCM5704 NIC results in CPU 100%SI , sluggish system performance
502916 - kernel BUG at drivers/scsi/libiscsi.c:301!

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kernel-2.6.18-128.1.14.el5.src.rpm

i386:
kernel-2.6.18-128.1.14.el5.i686.rpm
kernel-PAE-2.6.18-128.1.14.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-128.1.14.el5.i686.rpm
kernel-PAE-devel-2.6.18-128.1.14.el5.i686.rpm
kernel-debug-2.6.18-128.1.14.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-128.1.14.el5.i686.rpm
kernel-debug-devel-2.6.18-128.1.14.el5.i686.rpm
kernel-debuginfo-2.6.18-128.1.14.el5.i686.rpm
kernel-debuginfo-common-2.6.18-128.1.14.el5.i686.rpm
kernel-devel-2.6.18-128.1.14.el5.i686.rpm
kernel-headers-2.6.18-128.1.14.el5.i386.rpm
kernel-xen-2.6.18-128.1.14.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-128.1.14.el5.i686.rpm
kernel-xen-devel-2.6.18-128.1.14.el5.i686.rpm

noarch:
kernel-doc-2.6.18-128.1.14.el5.noarch.rpm

x86_64:
kernel-2.6.18-128.1.14.el5.x86_64.rpm
kernel-debug-2.6.18-128.1.14.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-128.1.14.el5.x86_64.rpm
kernel-debug-devel-2.6.18-128.1.14.el5.x86_64.rpm
kernel-debuginfo-2.6.18-128.1.14.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-128.1.14.el5.x86_64.rpm
kernel-devel-2.6.18-128.1.14.el5.x86_64.rpm
kernel-headers-2.6.18-128.1.14.el5.x86_64.rpm
kernel-xen-2.6.18-128.1.14.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-128.1.14.el5.x86_64.rpm
kernel-xen-devel-2.6.18-128.1.14.el5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kernel-2.6.18-128.1.14.el5.src.rpm

i386:
kernel-2.6.18-128.1.14.el5.i686.rpm
kernel-PAE-2.6.18-128.1.14.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-128.1.14.el5.i686.rpm
kernel-PAE-devel-2.6.18-128.1.14.el5.i686.rpm
kernel-debug-2.6.18-128.1.14.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-128.1.14.el5.i686.rpm
kernel-debug-devel-2.6.18-128.1.14.el5.i686.rpm
kernel-debuginfo-2.6.18-128.1.14.el5.i686.rpm
kernel-debuginfo-common-2.6.18-128.1.14.el5.i686.rpm
kernel-devel-2.6.18-128.1.14.el5.i686.rpm
kernel-headers-2.6.18-128.1.14.el5.i386.rpm
kernel-xen-2.6.18-128.1.14.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-128.1.14.el5.i686.rpm
kernel-xen-devel-2.6.18-128.1.14.el5.i686.rpm

ia64:
kernel-2.6.18-128.1.14.el5.ia64.rpm
kernel-debug-2.6.18-128.1.14.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-128.1.14.el5.ia64.rpm
kernel-debug-devel-2.6.18-128.1.14.el5.ia64.rpm
kernel-debuginfo-2.6.18-128.1.14.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-128.1.14.el5.ia64.rpm
kernel-devel-2.6.18-128.1.14.el5.ia64.rpm
kernel-headers-2.6.18-128.1.14.el5.ia64.rpm
kernel-xen-2.6.18-128.1.14.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-128.1.14.el5.ia64.rpm
kernel-xen-devel-2.6.18-128.1.14.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-128.1.14.el5.noarch.rpm

ppc:
kernel-2.6.18-128.1.14.el5.ppc64.rpm
kernel-debug-2.6.18-128.1.14.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-128.1.14.el5.ppc64.rpm
kernel-debug-devel-2.6.18-128.1.14.el5.ppc64.rpm
kernel-debuginfo-2.6.18-128.1.14.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-128.1.14.el5.ppc64.rpm
kernel-devel-2.6.18-128.1.14.el5.ppc64.rpm
kernel-headers-2.6.18-128.1.14.el5.ppc.rpm
kernel-headers-2.6.18-128.1.14.el5.ppc64.rpm
kernel-kdump-2.6.18-128.1.14.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-128.1.14.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-128.1.14.el5.ppc64.rpm

s390x:
kernel-2.6.18-128.1.14.el5.s390x.rpm
kernel-debug-2.6.18-128.1.14.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-128.1.14.el5.s390x.rpm
kernel-debug-devel-2.6.18-128.1.14.el5.s390x.rpm
kernel-debuginfo-2.6.18-128.1.14.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-128.1.14.el5.s390x.rpm
kernel-devel-2.6.18-128.1.14.el5.s390x.rpm
kernel-headers-2.6.18-128.1.14.el5.s390x.rpm
kernel-kdump-2.6.18-128.1.14.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-128.1.14.el5.s390x.rpm
kernel-kdump-devel-2.6.18-128.1.14.el5.s390x.rpm

x86_64:
kernel-2.6.18-128.1.14.el5.x86_64.rpm
kernel-debug-2.6.18-128.1.14.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-128.1.14.el5.x86_64.rpm
kernel-debug-devel-2.6.18-128.1.14.el5.x86_64.rpm
kernel-debuginfo-2.6.18-128.1.14.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-128.1.14.el5.x86_64.rpm
kernel-devel-2.6.18-128.1.14.el5.x86_64.rpm
kernel-headers-2.6.18-128.1.14.el5.x86_64.rpm
kernel-xen-2.6.18-128.1.14.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-128.1.14.el5.x86_64.rpm
kernel-xen-devel-2.6.18-128.1.14.el5.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1072
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1192
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1439
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1630
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1633
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1758
http://www.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is .  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2009 Red Hat, Inc.