Synopsis

Important: kernel-rt security, bug fix, and enhancement update

Type/Severity

Security Advisory: Important

Topic

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.

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.

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

Affected Products

• MRG Realtime 2 x86_64

Fixes

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

CVEs

• CVE-2014-7822
• CVE-2014-8086
• CVE-2014-8172
• CVE-2015-0274
• CVE-2014-8173

References

• https://access.redhat.com/security/updates/classification/#important

MRG Realtime 2

SRPM
kernel-rt-3.10.0-229.rt56.144.el6rt.src.rpm	SHA-256: ceb7b4247984ac951fa0b8b85c28a3c758b50665e475b739f72b12d013281654
x86_64
kernel-rt-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: 78dfe401892b934d58fc8fcdb69c6e53d26eac52e729c9f1c5514f20536646be
kernel-rt-debug-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: 3e413a908267160f315d2b1cdbfb99d47c0c97c84290eeb73fe2e580d1662f50
kernel-rt-debug-debuginfo-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: a69cf5b2fa0732cb10c318a7493c6926f07473e827fefa8489da943e92467c9d
kernel-rt-debug-devel-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: 158859e692a05b67fcc15da3ce62ea113007d63cb24f13e84c889e46782606af
kernel-rt-debuginfo-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: d2991b4a387c764723b3719c64982e87acedfcc5771adc5018d997bf3c50db97
kernel-rt-debuginfo-common-x86_64-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: 6c81ed536867696ec0647acfce24750d23f4b0c1158c063ed56db80bb0f5a9db
kernel-rt-devel-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: f3f220ea0e201b255346c0063d1e509e3a0703a35b646bed84c54ac92ab25e25
kernel-rt-doc-3.10.0-229.rt56.144.el6rt.noarch.rpm	SHA-256: f079da02e0b1b073c9bf3c35cceb0afe7cf7dcad8acd71ebf6d52d98d434226b
kernel-rt-firmware-3.10.0-229.rt56.144.el6rt.noarch.rpm	SHA-256: 274c132d8d76dfd05bae9148a25b3f944aec1fe95ed4574702de969bda4dccd0
kernel-rt-trace-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: 97ea7faffae547dd48cccda83c6e8b8344bb083a6a2beeb60493aac3ab5791a1
kernel-rt-trace-debuginfo-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: ec4076bdd49fe55ca79ef881ab5d301dd9d586fd65efc085467c1ad74c0d1776
kernel-rt-trace-devel-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: ffdf06f3c54f796a6fd68d3b6e59fd14872ad8e20dd454236b9be798ce36de86
kernel-rt-vanilla-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: 925aa3667e29e2af1bc4efa72e50f13a4319c9059d74c7c10f05b7854d092579
kernel-rt-vanilla-debuginfo-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: 90d422731c60a311066135d7624c76d5c8a0818d97e602a71ab27ff921a6e15a
kernel-rt-vanilla-devel-3.10.0-229.rt56.144.el6rt.x86_64.rpm	SHA-256: ae67f87ef00a3d73acf86198de5969425b06d65d2e1c3a223a61a6915dac3aff