Synopsis: Low: kernel security and bug fix update
Advisory ID: SLSA-2013:1034-1
Issue Date: 2013-07-10
CVE Numbers: CVE-2013-0914
This update fixes the following security issues:
* Information leaks in the Linux kernel could allow a local, unprivileged
user to leak kernel memory to user-space. (CVE-2012-6544, CVE-2012-6545,
CVE-2013-3222, CVE-2013-3224, CVE-2013-3231, CVE-2013-3235, Low)
* An information leak was found in the Linux kernel’s POSIX signals
implementation. A local, unprivileged user could use this flaw to bypass
the Address Space Layout Randomization (ASLR) security feature.
* A heap-based buffer overflow in the way the tg3 Ethernet driver parsed
the vital product data (VPD) of devices could allow an attacker with
physical access to a system to cause a denial of service or, potentially,
escalate their privileges. (CVE-2013-1929, Low)
This update also fixes the following bugs:
* Previously on system boot, devices with associated Reserved Memory
Region Reporting (RMRR) information had lost their RMRR information after
they were removed from the static identity (SI) domain. Consequently, a
system unexpectedly terminated in an endless loop due to unexpected NMIs
triggered by DMA errors. This problem was observed on HP ProLiant
Generation 7 (G7) and 8 (Gen8) systems. This update prevents non-USB
devices that have RMRR information associated with them from being placed
into the SI domain during system boot. HP ProLiant G7 and Gen8 systems
that contain devices with the RMRR information now boot as expected.
* Previously, the kernel’s futex wait code used timeouts that had
granularity in milliseconds. Also, when passing these timeouts to system
calls, the kernel converted the timeouts to “jiffies”. Consequently,
programs could time out inaccurately which could lead to significant
latency problems in certain environments. This update modifies the futex
wait code to use a high-resolution timer (hrtimer) so the timeout
granularity is now in microseconds. Timeouts are no longer converted to
“jiffies” when passed to system calls. Timeouts passed to programs are now
accurate and the programs time out as expected.
* A recent change modified the size of the task_struct structure in the
floating point unit (fpu) counter. However, on Intel Itanium systems, this
change caused the kernel Application Binary Interface (kABI) to stop
working properly when a previously compiled module was loaded, resulting
in a kernel panic. With this update the change causing this bug has been
reverted so the bug can no longer occur.
* The cxgb4 driver previously did not clear data structures used for
firmware requests. Consequently, when initializing some Chelsio’s
Terminator 4 (T4) adapters, a probe request could fail because the request
was incompatible with the adapter’s firmware. This update modifies the
cxgb4 driver to properly initialize firmware request structures before
sending a request to the firmware and the problem no longer occurs.
The system must be rebooted for this update to take effect.
– Scientific Linux Development Team