Bug 243042 (CVE-2008-3831)

Summary:	Kernel: <=2.6.24 drivers/char/drm/i915_dma.c DOS (CVE-2008-3831)
Product:	Gentoo Security	Reporter:	Stefan Behte (RETIRED) <craig>
Component:	Kernel	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	normal	CC:	kernel
Priority:	High
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-3831
Whiteboard:	[linux <2.6.25.19] [linux >=2.6.26 <2.6.26.7] [linux >=2.6.27 <2.6.27.3]
Package list:		Runtime testing required:	---

Description Stefan Behte (RETIRED) gentoo-dev

2008-10-21 12:38:21 UTC

CVE-2008-3831 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-3831):
  The i915 driver in (1) drivers/char/drm/i915_dma.c in the Linux
  kernel 2.6.24 on Debian GNU/Linux and (2) sys/dev/pci/drm/i915_drv.c
  in OpenBSD does not restrict the DRM_I915_HWS_ADDR ioctl to the
  Direct Rendering Manager (DRM) master, which allows local users to
  cause a denial of service (memory corruption) via a crafted ioctl
  call, related to absence of the DRM_MASTER and DRM_ROOT_ONLY flags in
  the ioctl's configuration.

Comment 1 Stefan Behte (RETIRED) gentoo-dev

2008-10-21 12:40:14 UTC

Patch:
http://www.openbsd.org/cgi-bin/cvsweb/src/sys/dev/pci/drm/i915_drv.c.diff?r1=1.7;r2=1.8

Comment 2 Gordon Malm (RETIRED) gentoo-dev

2008-10-21 20:21:47 UTC

Upstream fix:

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

Comment 3 Gordon Malm (RETIRED) gentoo-dev

2008-10-21 20:28:44 UTC

Patch is currently in the review cycle for 2.6.25.19, 2.6.26.7 and 2.6.27.3

Comment 4 kfm 2009-07-20 22:27:49 UTC

Further to Gordon's remark, the patch was indeed included in the referenced. stable patches. hardened-kernel unaffected at present time. Removing alias.

PS: genpatches-2.6.26-4 added 2.6.26.7. genpatches-2.6.27-3 added 2.6.27.3. =genpatches-2.6.25* remains vulnerable. However, hardened-sources-2.6.25-r13 does not because we independently folded in the newer stable patches.