[Ksplice][Ubuntu-12.10-Updates] New updates available via Ksplice (USN-1796-1)

[Sonja Tideman]

Synopsis: USN-1796-1 can now be patched using Ksplice
CVEs: CVE-2013-0914 CVE-2013-1767 CVE-2013-1792 CVE-2013-2546

Systems running Ubuntu 12.10 Quantal can now use Ksplice to patch
against the latest Ubuntu Security Notice, USN-1796-1.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack on Ubuntu 12.10 Quantal
install these updates.

On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf,
these updates will be installed automatically and you do not need to
take any action.

Alternatively, you can install these updates by running:

# /usr/sbin/uptrack-upgrade -y


DESCRIPTION

* Deadlock in spurious IRQ handling.

Invalid locking could lead to a deadlock in the spurious
IRQ deadlock handling code.


* NULL pointer dereference in comedi subdevice character device.

Missing NULL pointer checks could result in a kernel crash when
accessing sub-devices that don't support asynchronous operations.


* NULL pointer dereference in USB serial disconnect.

When an USB serial device is disconnected, a missing lock could lead
to a null pointer dereference with another function using the freed
data from the disconnected device.


* Denial-of-service in nanosleep implementation.

Failure to clean up correctly timers when performing a clock_nanosleep()
call using CPU_TIMER would result in a reference count leak on the
calling task.  This could allow an unprivileged, local user to trigger a
denial-of-service attack.


* Kernel crash in NFSv4.1 in XDR decode.

Invalid assumptions when decoding XDR messages can lead to the
NFSv4 code using uninitialized memory, leading to a kernel crash.


* Kernel deadlock in Xen pv-spinlocks.

A race condition can lead to a deadlock where a CPU gets stuck
waiting forever for a lock.


* CVE-2013-1767: Use-after-free in tmpfs mempolicy remount.

If a tempfs mount that was originally mounted with the mpol=M
option is remounted it reuses the already freed mempolicy object.


* NULL pointer dereference in ext4 bitmap handling.

A missing NULL pointer check could result in a kernel crash when
processing block bitmaps in the ext4 filesystem.


* Use-after-free in ext4 AIO handling.

An inode reference was released before all operations on it were
complete.  This might lead to a use-after-free if the inode was freed.


* Race condition in ext4 block preallocation.

Incorrect locking in ext4 block preallocation could lead to memory
corruption and undefined behavior.


* Kernel crash in target lun configuration.

Missing bounds checks for the mapped_lun attribute in the target lun
configfs filesystem could result in a kernel crash.


* Use-after-free in direct I/O AIO handling.

An inode reference was released before all operations on it were
complete.  This might lead to a use-after-free if the inode was freed.


* Use-after-free in OCFS2 AIO handling.

An inode reference was released before all operations on it were
complete.  This might lead to a use-after-free if the inode was freed.


* Deadlock in GSM driver on multiplexer close.

If a multiplexer is closed while client ports are still open,
the n_gsm driver attempts to close the client ports but ends up
deadlocking waiting on a lock.


* CVE-2013-1792: Denial-of-service in user keyring management.

A race condition in installing a user keyring could allow a local,
unprivileged user to crash the machine causing a denial-of-service.


* CVE-2013-0914: Information leak in signal handlers.

A logic error in the handling of signal handlers allows a child process to
leak information about the memory layout of parent processes.


* CVE-2013-2546, 2547, 2548: Information leaks in crypto report API.

Invalid memory copying and a failure to properly initilize all structure
data fields could result in kernel memory disclosures in the crypto
algorithm report API.

SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.