Important: kernel security and bug fix update

Updated kernel packages that fix several security issues and several bugs
are now available for Red Hat Enterprise MRG 1.0.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

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

These updated packages fix the following security issues:

* the possibility of a timeout value overflow was found in the Linux kernel
high-resolution timers functionality, hrtimer. This could allow a local
unprivileged user to execute arbitrary code, or cause a denial of service
(kernel panic). (CVE-2007-5966, Important)

* the possibility of a kernel crash was found in the Linux kernel IPsec
protocol implementation, due to improper handling of fragmented ESP
packets. When an attacker controlling an intermediate router fragmented
these packets into very small pieces, it would cause a kernel crash on the
receiving node during packet reassembly. (CVE-2007-6282, Important)

* on 64-bit architectures, the possibility of a timer-expiration value
overflow was found in the Linux kernel high-resolution timers
functionality, hrtimer. This could allow a local unprivileged user to set
up a large interval value, forcing the timer expiry value to become
negative, causing a denial of service (kernel hang).
(CVE-2007-6712, Important)

* on AMD64 architectures, the possibility of a kernel crash was discovered
by testing the Linux kernel process-trace ability. This could allow a local
unprivileged user to cause a denial of service (kernel crash).
(CVE-2008-1615, Important)

* a possible kernel memory leak was found in the Linux kernel Simple
Internet Transition (SIT) INET6 implementation. This could allow a local
unprivileged user to cause a denial of service. (CVE-2008-2136, Important)

* a flaw was found in the Linux kernel utimensat system call. File
permissions were not checked when UTIME_NOW and UTIME_OMIT combinations
were used. This could allow a local unprivileged user to modify file times
of arbitrary files, possibly leading to a denial of service.
(CVE-2008-2148, Important)

* a security flaw was found in the Linux kernel memory copy routines, when
running on certain AMD64 architectures. If an unsuccessful attempt to copy
kernel memory from source to destination memory locations occurred, the
copy routines did not zero the content at the destination memory location.
This could allow a local unprivileged user to view potentially sensitive
data. (CVE-2008-2729, Important)

* Gabriel Campana discovered a possible integer overflow flaw in the Linux
kernel Stream Control Transmission Protocol (SCTP) implementation. This
deficiency could lead to privilege escalation. (CVE-2008-2826, Important)

* a deficiency was found in the Linux kernel virtual memory implementation.
This could allow a local unprivileged user to make a large number of calls
to the get_user_pages function, possibly causing a denial of service.
(CVE-2008-2372, Low)

Also, these updated packages fix the following bugs:

* gdb set orig_rax to 0x00000000ffffffff, which is recognized by the
upstream kernel as "-1", but not by the Red Hat Enterprise MRG kernel.

* if the POSIX timer was programmed to fire immediately, the timer's
signal was sometimes not delivered (timer does not fire).

* rwlock caused crashes and application hangs.

* running oprofile caused system panics.

* threads releasing a mutex may have received an EPERM error.

* booting the RT kernel with the "nmi_watchdog=2" kernel option caused a
kernel panic, and an "Unable to handle kernel paging request" error.

* "echo 0 > /sys/devices/system/cpu/cpu1/online" caused crashes.

* a crash on a JTC machine.

* added a new "FUTEX_WAIT_BITSET" system call, identical to FUTEX_WAIT,
that accepts absolute time as a timeout.

Red Hat Enterprise MRG 1.0 users are advised to upgrade to these updated
packages, which contain backported patches to resolve these issues.

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

404291 - CVE-2007-6282 IPSec ESP kernel panics
429290 - provide a futex syscall command similiar to FUTEX_WAIT with takes absolute timeout
431430 - CVE-2008-1615 kernel: ptrace: Unprivileged crash on x86_64 %cs corruption
439999 - CVE-2007-6712 kernel: infinite loop in highres timers (kernel hang)
446031 - CVE-2008-2136 kernel: sit memory leak
446060 - kernel: sched_fair.c simplify sched_slice()
446397 - java testcase hangs on 2.6.24.7-52ibmrt2.3 kernel
446777 - pthread_mutex_unlock returns EPERM due to earlier EFAULT from futex lock
449676 - Turning a CPU offline causes panic
451271 - CVE-2008-2729 kernel: [x86_64] The string instruction version didn't zero the output on exception.
452478 - CVE-2008-2826 kernel: sctp: sctp_getsockopt_local_addrs_old() potential overflow
452666 - CVE-2008-2372 kernel: Reinstate ZERO_PAGE optimization in 'get_user_pages()' and fix XIP
452692 - crash with 2.6.24.7-65.el5rt
452693 - POSIX timer set to fire immediately does not fire
452974 - [24][FOCUS] plist_add/del crash with 2.6.24.7-65ibmrt2.4 kernel
453135 - CVE-2007-5966 Non-root can trigger cpu_idle soft lockup (tickless kernel only)
453677 - nmi_watchdog=2 crashes the RT kernel on boot up
454913 - [Realtime][Kernel] LTP test failure in sched_rr_get_interval02 testcase
455275 - CVE-2008-2148 kernel: fix permission checking in sys_utimensat
455747 - Oops when running oprofile

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5966
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6282
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6712
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1615
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2136
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2148
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2372
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2729
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2826
http://www.redhat.com/security/updates/classification/#important