RHSA-2015:0102: Important: kernel security and bug fix update

The kernel packages contain the Linux kernel, the core of any Linuxoperating system. A flaw was found in the way the Linux kernel's SCTP implementation validated INIT chunks when performing Address Configuration Change(ASCONF). A remote attacker could use this flaw to crash the system bysending a specially crafted SCTP packet to trigger a NULL pointerdereference on the system. (CVE-2014-7841, Important) A race condition flaw was found in the way the Linux kernel's mmap(2), madvise(2), and fallocate(2) system calls interacted with each other whileoperating on virtual memory file system files. A local user could use thisflaw to cause a denial of service. (CVE-2014-4171, Moderate) A NULL pointer dereference flaw was found in the way the Linux kernel's Common Internet File System (CIFS) implementation handled mounting of filesystem shares. A remote attacker could use this flaw to crash a clientsystem that would mount a file system share from a malicious server.(CVE-2014-7145, Moderate) A flaw was found in the way the Linux kernel's splice() system call validated its parameters. On certain file systems, a local, unprivilegeduser could use this flaw to write past the maximum file size, and thuscrash the system. (CVE-2014-7822, Moderate) It was found that the parserockridgeinodeinternal() function of the Linux kernel's ISOFS implementation did not correctly check relocateddirectories when processing Rock Ridge child link (CL) tags. An attackerwith physical access to the system could use a specially crafted ISO imageto crash the system or, potentially, escalate their privileges on thesystem. (CVE-2014-5471, CVE-2014-5472, Low)Red Hat would like to thank Akira Fujita of NEC for reporting theCVE-2014-7822 issue. The CVE-2014-7841 issue was discovered by Liu Wei ofRed Hat.This update also fixes the following bugs: Previously, a kernel panic could occur if a process reading from a locked NFS file was killed and the lock was not released properly before the readoperations finished. Consequently, the system crashed. The code handlingfile locks has been fixed, and instead of halting, the system now emits awarning about the unreleased lock. (BZ#1172266) A race condition in the command abort handling logic of the ipr device driver could cause the kernel to panic when the driver received a responseto an abort command prior to receiving other responses to the abortedcommand due to the support for multiple interrupts. With this update, theabort handler waits for the aborted command's responses first beforecompleting an abort operation. (BZ#1162734) Previously, a race condition could occur when changing a Page Table Entry (PTE) or a Page Middle Directory (PMD) to "ptenuma" or "pmdnuma",respectively, causing the kernel to crash. This update removes the BUGON()macro from the handlemmfault() function, preventing the kernel panic inthe aforementioned scenario. (BZ#1170662)All kernel users are advised to upgrade to these updated packages, whichcontain backported patches to correct these issues. The system must berebooted for this update to take effect.