Bug 648665 (CVE-2010-4078)

Summary:	CVE-2010-4078 kernel: drivers/video/sis/sis_main.c: reading uninitialized stack memory
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	Keywords:	Security
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Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	Bug Fix
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Last Closed:	2015-08-22 05:56:58 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Petr Matousek 2010-11-01 21:23:07 UTC

Description of problem:
The FBIOGET_VBLANK device ioctl in sis_main.c allows unprivileged users to read 16 bytes of uninitialized stack memory, because the 'reserved' member of the fb_vblank struct declared on the stack is not altered or zeroed before being copied back to the user.

Reference:
http://www.openwall.com/lists/oss-security/2010/10/06/6
http://lkml.indiana.edu/hypermail//linux/kernel/1009.1/03385.html

Acknowledgements:

Red Hat would like to thank Dan Rosenberg for reporting this issue.

Comment 1 Petr Matousek 2010-11-02 11:05:55 UTC

Statement:

This issue did not affect the versions of Linux kernel as shipped with Red Hat
Enterprise Linux 3, 4, 5, and Red Hat Enterprise MRG as they did not include
or support the affected functionality.

Comment 2 Eugene Teo (Security Response) 2010-11-22 13:33:33 UTC

Upstream commit:
http://git.kernel.org/linus/fd02db9de73faebc51240619c7c7f99bee9f65c7