RHSA-2015:1788: Important: kernel-rt security, bug fix, and enhancement update

The kernel-rt packages contain the Linux kernel, the core of any Linuxoperating system. A flaw was found in the kernel's implementation of the Berkeley Packet Filter (BPF). A local attacker could craft BPF code to crash the system bycreating a situation in which the JIT compiler would fail to correctlyoptimize the JIT image on the last pass. This would lead to the CPUexecuting instructions that were not part of the JIT code. (CVE-2015-4700,Important) Two flaws were found in the way the Linux kernel's networking implementation handled UDP packets with incorrect checksum values. A remoteattacker could potentially use these flaws to trigger an infinite loop inthe kernel, resulting in a denial of service on the system, or cause adenial of service in applications using the edge triggered epollfunctionality. (CVE-2015-5364, CVE-2015-5366, Important) A flaw was found in the way the Linux kernel's ext4 file system handled the "page size > block size" condition when the fallocate zero rangefunctionality was used. A local attacker could use this flaw to crash thesystem. (CVE-2015-0275, Moderate) It was found that the Linux kernel's keyring implementation would leak memory when adding a key to a keyring via the addkey() function. A localattacker could use this flaw to exhaust all available memory on the system.(CVE-2015-1333, Moderate) A race condition flaw was found in the way the Linux kernel's SCTP implementation handled Address Configuration lists when performing AddressConfiguration Change (ASCONF). A local attacker could use this flaw tocrash the system via a race condition triggered by setting certain ASCONFoptions on a socket. (CVE-2015-3212, Moderate) An information leak flaw was found in the way the Linux kernel's Virtual Dynamic Shared Object (vDSO) implementation performed addressrandomization. A local, unprivileged user could use this flaw to leakkernel memory addresses to user-space. (CVE-2014-9585, Low)Red Hat would like to thank Daniel Borkmann for reporting CVE-2015-4700,and Canonical for reporting the CVE-2015-1333 issue. The CVE-2015-0275issue was discovered by Xiong Zhou of Red Hat, and the CVE-2015-3212 issuewas discovered by Ji Jianwen of Red Hat Engineering.The kernel-rt packages have been upgraded to version 3.10.0-229.13.1, whichprovides a number of bug fixes and enhancements over the previous version,including: Fix regression in scsisendehcmnd() boot hangs at "Console: switching to colour dummy device 80x25" Update tcp stack to 3.17 kernel Missing some code from patch "(...) Fix VGA switcheroo problem related to hotplug" ksoftirqd high CPU usage due to stray tasklet from ioatdma driver During Live Partition Mobility (LPM) testing, RHEL 7.1 LPARs will crash in kmemcachealloc(BZ#1253809)This update also fixes the following bug: The hwlatdetector.ko module samples the clock and records any intervals between reads that exceed a specified threshold. However, the modulepreviously tracked the maximum interval seen for the "inner" interval butdid not record when the "outer" interval was greater. A patch has beenapplied to fix this bug, and hwlatdetector.ko now correctly records if theouter interval is the maximal interval encountered during the run.(BZ#1252365)All kernel-rt users are advised to upgrade to these updated packages, whichcorrect these issues and add these enhancements. The system must berebooted for this update to take effect.