Synopsis

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

Type/Severity

Security Advisory: Important

Topic

Updated kernel-rt packages that fix one security issue, several bugs, and
add various enhancements are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Important security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

Description

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

• A buffer overflow flaw was found in the way the Linux kernel's Intel
  AES-NI instructions optimized version of the RFC4106 GCM mode decryption
  functionality handled fragmented packets. A remote attacker could use this
  flaw to crash, or potentially escalate their privileges on, a system over a
  connection with an active AEC-GCM mode IPSec security association.
  (CVE-2015-3331, Important)
  

The kernel-rt packages have been upgraded to version 3.10.0-229.4.1, which
provides a number of bug fixes and enhancements over the previous version,
including:

• Audit subsystem not resolving path name on directory watches
  
• audit watches do not track correctly after a rename
  
• auditctl output is changed in RHEL 7
  
• megaraid_sas: non-booting system with intel_iommu=on kernel parameter
  
• GFS2: kernel NULL pointer dereference in gfs2_inplace_reserve
  
• Crypto adapter cannot be brought online - affect all HW
  
• crypto/seqiv.c: wrong check of return code from crypto_rng_get_bytes
  
• Backport crypto: sha256_ssse3 - also test for BMI2
  
• Null pointer at team_handle_frame+0x62/0x100 [team]
  
• AES CTR x86_64 "by8" AVX optimization
  
• Intel RDSEED - Fix for entropy counting
  
• Intel SHA1 multi-buffer crypto implementation
  
• Intel SHA1 AVX2 optimization support
  
• mlx4_en: HW timestamp ends up in error queue of socket which does not
  have SO_TIMESTAMPING enabled
  

(BZ#1209963)

This update also fixes the following bugs:

• Prior to this update, heavy lock contention occurred on systems with
  greater than 32 cores when large numbers of tasks went idle simultaneously.
  Consequently, all the idle CPUs attempted to acquire the run-queue (rq)
  lock of a CPU with extra tasks in order to pull those run-able tasks.
  This increased scheduler latency due to the lock contention. Instead of
  each idle CPU attempting to acquire the run-queue lock, now each idle CPU
  will send an IPI to let the overloaded CPU select one core to pull tasks
  from it. The result is less spin-lock contention on the rq lock and
  produces improved scheduler response time. (BZ#1210924)
  
• The CONFIG_NO_HZ logic enabled/disabled the timer tick every time a CPU
  went into an idle state. This timer tick manipulation caused the system
  performance (throughput) to suffer. The CONFIG_NO_HZ configuration setting
  is now turned off by default, which increases the throughput due to the
  lower idle overhead while allowing system administrators to enable it
  selectively in their environment. (BZ#1210597)
  

All kernel-rt users are advised to upgrade to these updated packages, which
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

• Red Hat Enterprise Linux for Real Time 7 x86_64

Fixes

• BZ - 1209963 - kernel-rt: rebase tree to match RHEL7.1.z source tree
• BZ - 1213322 - CVE-2015-3331 Kernel: crypto: buffer overruns in RFC4106 implementation using AESNI

CVEs

• CVE-2015-3331

References

• http://www.redhat.com/security/updates/classification/#normal

Red Hat Enterprise Linux for Real Time 7

SRPM
kernel-rt-3.10.0-229.4.2.rt56.141.6.el7_1.src.rpm	SHA-256: 23e1d162cefd4df4f3f52e832142efec568f3c8a29623a13a50c98b144984dc6
x86_64
kernel-rt-3.10.0-229.4.2.rt56.141.6.el7_1.x86_64.rpm	SHA-256: 12321db7f77e0a7d57315f135ea4a1f26d3cf30db3c28d1671ac7e265a400be9
kernel-rt-debug-3.10.0-229.4.2.rt56.141.6.el7_1.x86_64.rpm	SHA-256: 2bd879fbcad78273e21354990c2698e62147dedf98e316bb679d4b8ac3a315a0
kernel-rt-debug-debuginfo-3.10.0-229.4.2.rt56.141.6.el7_1.x86_64.rpm	SHA-256: b404eec3fcd2e26547e4bc4a7a7860bf62e67acd427d6114bb8b5d69c663822d
kernel-rt-debug-devel-3.10.0-229.4.2.rt56.141.6.el7_1.x86_64.rpm	SHA-256: d75de24db4d0fab0512c8eb3838d7bf9c82e603ad99272b30c7f10cd98d7112e
kernel-rt-debuginfo-3.10.0-229.4.2.rt56.141.6.el7_1.x86_64.rpm	SHA-256: 0536e3154701173bcc6e7f132507ffc812fdc718729414530e0a009f9e181df6
kernel-rt-debuginfo-common-x86_64-3.10.0-229.4.2.rt56.141.6.el7_1.x86_64.rpm	SHA-256: aa4e8c25959c985e20f5e4e3b9dd0f94007bb10eb92dce88896bde5e2f3adcec
kernel-rt-devel-3.10.0-229.4.2.rt56.141.6.el7_1.x86_64.rpm	SHA-256: 9111bc40cd38b89bae06cc8640f6179aa8a7c6808da430b4474cda3081757c1a
kernel-rt-doc-3.10.0-229.4.2.rt56.141.6.el7_1.noarch.rpm	SHA-256: 14d1711cfb2124ea8bee112ef6d5f9197bf3b4fc6037195d4bff99f4569451b8
kernel-rt-trace-3.10.0-229.4.2.rt56.141.6.el7_1.x86_64.rpm	SHA-256: 040b559c74bb33ad1875548e351ef7fc42ff9897e834c2f4aa3acea961c48c68
kernel-rt-trace-debuginfo-3.10.0-229.4.2.rt56.141.6.el7_1.x86_64.rpm	SHA-256: 8e81758086d19323f08d418ffeea714bc62e3b42c4eb8bce37c34d22ef5e36c2
kernel-rt-trace-devel-3.10.0-229.4.2.rt56.141.6.el7_1.x86_64.rpm	SHA-256: 20773b9d74d44d8551a33b21d44d2d05f44854a9183df09a3e8358da33fda2f6