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TITLE:
Linux Kernel ptrace Single Step "CS" Null Pointer Dereference

SECUNIA ADVISORY ID:
SA26935

VERIFY ADVISORY:
http://secunia.com/advisories/26935/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/

DESCRIPTION:
Evan Teran has reported a security issue in the Linux kernel, which
potentially can be exploited by malicious, local users to cause a DoS
(Denial of Service).

The vulnerability is caused due to an error in ptrace when
single-stepping a debugged child process with invalid values in the
"CS" register, which can be exploited to cause a kernel oops.

SOLUTION:
Fixed in the GIT repository.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=29eb51101c02df517ca64ec472d7501127ad1da8
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a10d9a71bafd3a283da240d2868e71346d2aef6f

PROVIDED AND/OR DISCOVERED BY:
Evan Teran

ORIGINAL ADVISORY:
http://bugzilla.kernel.org/show_bug.cgi?id=8765

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