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TITLE:
Linux Kernel DRM_I915_HWS_ADDR IOCTL Privilege Escalation

SECUNIA ADVISORY ID:
SA32320

VERIFY ADVISORY:
http://secunia.com/advisories/32320/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

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

DESCRIPTION:
Olaf Kirch has reported a vulnerability in the Linux kernel, which
can be exploited by malicious, local users to potentially gain
escalated privileges.

The vulnerability is caused due to the DRM_I915_HWS_ADDR IOCTL being
available to non-root users, which can be exploited to e.g. zero and
remap memory locations by sending a specially crafted IOCTL to the
driver.

Successful exploitation may allow to execute arbitrary code with
escalated privileges, but requires an Intel G33 series or newer
chipset.

SOLUTION:
Fixed in version 2.6.27-git8.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4b40893918203ee1a1f6a114316c2a19c072e9bd

PROVIDED AND/OR DISCOVERED BY:
Olaf Kirch

ORIGINAL ADVISORY:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4b40893918203ee1a1f6a114316c2a19c072e9bd

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