Bug 558677 – CVE-2010-0299 kernel: Driver-Core: devtmpfs - set root directory mode to 0755

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Bug 558677 - (CVE-2010-0299) CVE-2010-0299 kernel: Driver-Core: devtmpfs - set root directory mode to 0755

Summary:	CVE-2010-0299 kernel: Driver-Core: devtmpfs - set root directory mode to 0755

Status:	CLOSED CURRENTRELEASE

Aliases:	CVE-2010-0299

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	high Severity high
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
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Whiteboard:	impact=important,source=vendor-sec,re...
Keywords:	Security

Depends On:	547593 586016 586020
Blocks:
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Reported:	2010-01-25 19:34 EST by Eugene Teo (Security Response)
Modified:	2015-07-31 02:24 EDT (History)
CC List:	7 users (show)

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Fixed In Version:
Doc Type:	Bug Fix
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Last Closed:	2012-03-28 04:38:32 EDT
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Description Eugene Teo (Security Response) 2010-01-25 19:34:38 EST

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) 2010-01-25 19:37:39 EST

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 2010-01-28 22:16:04 EST

Fixed in 2.6.32.7 by:

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

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