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TITLE:
Linux Kernel "clear_child_tid" Memory Corruption

SECUNIA ADVISORY ID:
SA35983

VERIFY ADVISORY:
http://secunia.com/advisories/35983/

DESCRIPTION:
A vulnerability has been reported in the Linux Kernel, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service).

The vulnerability is caused due to the kernel improperly using the
"current->clear_child_tid" pointer from a parent process when writing
to memory in a child process. This can be exploited to corrupt memory
in a child process created with "fork()".

SOLUTION:
Restrict local access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Jens Rosenboom

ORIGINAL ADVISORY:
http://lkml.org/lkml/2009/7/31/76

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