7.2 - RHSA-2015:0694

Problem Description:

Updated kernel-rt packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise MRG 2.5.

Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

2. Relevant releases/architectures:

MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

3. Description:

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

* A flaw was found in the way the Linux kernel's XFS file system handled replacing of remote attributes under certain conditions. A local user with access to XFS file system mount could potentially use this flaw to escalate their privileges on the system. (CVE-2015-0274, Important)

* A flaw was found in the way the Linux kernel's splice() system call validated its parameters. On certain file systems, a local, unprivileged user could use this flaw to write past the maximum file size, and thus crash the system. (CVE-2014-7822, Moderate)

* A race condition flaw was found in the Linux kernel's ext4 file system implementation that allowed a local, unprivileged user to crash the system by simultaneously writing to a file and toggling the O_DIRECT flag using fcntl(F_SETFL) on that file. (CVE-2014-8086, Moderate)

* It was found that due to excessive files_lock locking, a soft lockup could be triggered in the Linux kernel when performing asynchronous I/O operations. A local, unprivileged user could use this flaw to crash the system. (CVE-2014-8172, Moderate)

* A NULL pointer dereference flaw was found in the way the Linux kernel's madvise MADV_WILLNEED functionality handled page table locking. A local, unprivileged user could use this flaw to crash the system. (CVE-2014-8173, Moderate)

Red Hat would like to thank Eric Windisch of the Docker project for reporting CVE-2015-0274, and Akira Fujita of NEC for reporting CVE-2014-7822.

Bug fixes:

* A patch removing the xt_connlimit revision zero ABI was not reverted in the kernel-rt package, which caused problems because the iptables package requires this revision. A patch to remove the xt_connlimit revision 0 was reverted from the kernel-rt sources to allow the iptables command to execute correctly. (BZ#1169755)

* With an older Mellanox Connect-IB (mlx4) driver present in the MRG Realtime kernel, a race condition could occur that would cause a loss of connection. The mlx4 driver was updated, resolving the race condition and allowing proper connectivity. (BZ#1182246)

* The MRG Realtime kernel did not contain the appropriate code to resume after a device failed, causing the volume status after a repair to not be properly updated. A 'refresh needed' was still listed in the 'lvs' output after executing the 'lvchange --refresh' command. A patch was added that adds the ability to correctly restore a transiently failed device upon resume. (BZ#1159803)

* The sosreport executable would hang when reading /proc/net/rpc/use-gss-proxy because of faulty wait_queue logic in the proc handler. This wait_queue logic was removed from the proc handler, allowing the reads to correctly return the current state. (BZ#1169900)

Enhancements:

* The MRG Realtime kernel-rt sources have been modified to take advantage of the updated 3.10 kernel sources that are available with the Red Hat Enterprise Linux 7 releases. (BZ#1172844)

* The MRG Realtime version of the e1000e driver has been updated to provide support for the Intel I218-LM network adapter. (BZ#1191767)

* The MRG Realtime kernel was updated to provide support for the Mellanox Connect-IB (mlx5). (BZ#1171363)

* The rt-firmware package has been updated to provide additional firmware files required by the new version of the Red Hat Enterprise MRG 2.5 kernel (BZ#1184251)

All kernel-rt users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements. The system must be rebooted for this update to take effect.

4. Solution:

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

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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

1151353 - CVE-2014-8086 Kernel: fs: ext4 race condition 1163792 - CVE-2014-7822 kernel: splice: lack of generic write checks 1169755 - iptables: Protocol wrong type for socket (regression, bisected) 1171363 - realtime kernel does not support Mellanox Connect-IB(mlx5) 1172844 - RFE: rebase the 3.10 kernel-rt 1195248 - CVE-2015-0274 kernel: xfs: replacing remote attributes memory corruption 1198457 - CVE-2014-8173 kernel: NULL pointer dereference in madvise(MADV_WILLNEED) support 1198503 - CVE-2014-8172 kernel: soft lockup on aio