Bug 251185 - (CVE-2007-3851) CVE-2007-3851 i965 DRM allows insecure packets
CVE-2007-3851 i965 DRM allows insecure packets
Status: CLOSED CURRENTRELEASE
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Aristeu Rozanski
impact=important,source=kernelsec,rep...
: Security
Depends On: 251188 252305
Blocks:
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Reported: 2007-08-07 12:59 EDT by Marcel Holtmann
Modified: 2012-05-02 11:11 EDT (History)
6 users (show)

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Doc Type: Bug Fix
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Last Closed: 2012-05-02 11:11:25 EDT
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Description Marcel Holtmann 2007-08-07 12:59:33 EDT
The Intel 965 and above chipsets moved the batch buffer security bit to
another place, this means the current DRM allows commands that can touch
any part of main memory to be submitted on those chipsets. The user
requires to be logged onto a local X server and have access to the drm. 

a) which users typically have access to the drm?  Anyone?

There is an xorg config option to set the permissions, but typically
only the logged in user on the primary X server can actually do anything
as there is a separate authentication processes, so usually the user
already has physical access at that point..

b) what actually can they do with it?  Modify arbitrary physical
   addresses with user-provided data?  Or something less bad?

Transfer user data to any physcial memory address...

The documentation required to actually exploit this bug isn't publicly
available.

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