Bug 558677 (CVE-2010-0299)

Summary:	CVE-2010-0299 kernel: Driver-Core: devtmpfs - set root directory mode to 0755
Product:	[Other] Security Response	Reporter:	Eugene Teo (Security Response) <eteo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	arozansk, davej, kmcmartin, lwang, pmatouse, rcvalle, tcallawa
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-03-28 08:38:32 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	547593, 586016, 586020
Bug Blocks:

Description Eugene Teo (Security Response) 2010-01-26 00:34:38 UTC

Description of problem:
devtmpfs - set root directory mode to 0755.

Devtmpfs lets the kernel create a tmpfs instance called devtmpfs very early at kernel initialization, before any driver-core device is registered. Every device with a major/minor will provide a device node in devtmpfs. Devtmpfs can be changed and altered by userspace at any time, and in any way needed - just like today's udev-mounted tmpfs.

Make sure the root directory permissions is 0755 instead of 1777.

This was introduced in v2.6.32-rc1 via commit 2b2af54a.

Upstream commit:
http://git.kernel.org/linus/f776c5ec4690b21b3668ad5956774a22c86f541a
http://git.kernel.org/linus/9329d1beaeed1a94f030c784dcec5ff973f402c4

Comment 1 Eugene Teo (Security Response) 2010-01-26 00:37:39 UTC

The Linux kernel as shipped with Red Hat Enterprise Linux 3, 4, 5 and Red Hat Enterprise MRG did not include support for Devtmpfs, and therefore are not affected by this issue.

Comment 5 Chuck Ebbert 2010-01-29 03:16:04 UTC

Fixed in 2.6.32.7 by:

 driver-core-devtmpfs-set-root-directory-mode-to-0755.patch