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

Synopsis:          Important: kernel-alt security and bug fix update
Advisory ID:       RHSA-2018:0502-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:0502
Issue date:        2018-03-13
CVE Names:         CVE-2017-16994 CVE-2017-17712 
=====================================================================

1. Summary:

An update for kernel-alt is now available for Red Hat Enterprise Linux 7.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, noarch, ppc64le
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, noarch, ppc64le

3. Description:

The kernel-alt packages provide the Linux kernel version 4.x.

Security Fix(es):

* hw: cpu: speculative execution permission faults handling (CVE-2017-5754,
Important)(ppc only)

* kernel: Race condition in raw_sendmsg function allows denial-of-service
or kernel addresses leak (CVE-2017-17712, Important)

* kernel: mm/pagewalk.c:walk_hugetlb_range function mishandles holes in
hugetlb ranges causing information leak (CVE-2017-16994, Moderate)

Bug Fix(es):

* When changing the Maximum Transmission Unit (MTU) size on Broadcom
BCM5717, BCM5718 and BCM5719 chipsets, the tg3 driver sometimes lost
synchronization with the device. Consequently, the device became
unresponsive. With this update, tg3 has been fixed, and devices no longer
hang due to this behavior. (BZ#1533478)

* Previously, the perf tool used strict string matching to provide related
events to a particular CPUID instruction. Consequently, the events were not
available on certain IBM PowerPC systems. This update fixes perf to use
regular expressions instead of string matching of the entire CPUID string.
As a result, the perf tool now supports events on IBM PowerPC architectures
as expected. (BZ#1536567)

* Previously, the kernel debugfs file system implemented removal protection
based on sleepable read-copy-update (SRCU), which slowed down the drivers
relying on the debugfs_remove_recursive() function. Consequently, a
decrease in performance or a deadlock sometimes occurred. This update
implements per-file removal protection in debugfs. As a result, the
performance of the system has improved significantly. (BZ#1538030)

* When running the 'perf test' command on a PowerKVM guest multiple times,
the branch instructions recorded in Branch History Rolling Buffer (BHRB)
entries were sometimes unmapped before the kernel processed the entries.
Consequently, the operating system terminated unexpectedly. This update
fixes the bug, and the operating system no longer crashes in the described
situation. (BZ#1538031)

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

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

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

1518155 - CVE-2017-16994 kernel: mm/pagewalk.c:walk_hugetlb_range function mishandles holes in hugetlb ranges causing information leak
1519781 - CVE-2017-5754 hw: cpu: speculative execution permission faults handling
1526427 - CVE-2017-17712 kernel: Race condition in raw_sendmsg function allows denial-of-service or kernel addresses leak

6. Package List:

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

Source:
kernel-alt-4.11.0-44.6.1.el7a.src.rpm

aarch64:
kernel-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-debug-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-debug-debuginfo-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-debug-devel-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-debuginfo-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-devel-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-headers-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-tools-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-tools-debuginfo-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-tools-libs-4.11.0-44.6.1.el7a.aarch64.rpm
perf-4.11.0-44.6.1.el7a.aarch64.rpm
perf-debuginfo-4.11.0-44.6.1.el7a.aarch64.rpm
python-perf-4.11.0-44.6.1.el7a.aarch64.rpm
python-perf-debuginfo-4.11.0-44.6.1.el7a.aarch64.rpm

noarch:
kernel-abi-whitelists-4.11.0-44.6.1.el7a.noarch.rpm
kernel-doc-4.11.0-44.6.1.el7a.noarch.rpm

ppc64le:
kernel-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-bootwrapper-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-debug-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-debug-debuginfo-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-debug-devel-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-debuginfo-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-devel-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-headers-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-tools-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-tools-libs-4.11.0-44.6.1.el7a.ppc64le.rpm
perf-4.11.0-44.6.1.el7a.ppc64le.rpm
perf-debuginfo-4.11.0-44.6.1.el7a.ppc64le.rpm
python-perf-4.11.0-44.6.1.el7a.ppc64le.rpm
python-perf-debuginfo-4.11.0-44.6.1.el7a.ppc64le.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):

aarch64:
kernel-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-debug-debuginfo-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-debuginfo-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-tools-debuginfo-4.11.0-44.6.1.el7a.aarch64.rpm
kernel-tools-libs-devel-4.11.0-44.6.1.el7a.aarch64.rpm
perf-debuginfo-4.11.0-44.6.1.el7a.aarch64.rpm
python-perf-debuginfo-4.11.0-44.6.1.el7a.aarch64.rpm

noarch:
kernel-abi-whitelists-4.11.0-44.6.1.el7a.noarch.rpm
kernel-doc-4.11.0-44.6.1.el7a.noarch.rpm

ppc64le:
kernel-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-debug-debuginfo-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-debuginfo-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.11.0-44.6.1.el7a.ppc64le.rpm
kernel-tools-libs-devel-4.11.0-44.6.1.el7a.ppc64le.rpm
perf-debuginfo-4.11.0-44.6.1.el7a.ppc64le.rpm
python-perf-debuginfo-4.11.0-44.6.1.el7a.ppc64le.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://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2017-16994
https://access.redhat.com/security/cve/CVE-2017-17712
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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