Bug 144525

Summary:	CAN-2005-0179 RLIMIT_MEMLOCK bypass and (2.6) unprivileged user DoS
Product:	Red Hat Enterprise Linux 2.1	Reporter:	Josh Bressers <bressers>
Component:	kernel	Assignee:	Jim Paradis <jparadis>
Status:	CLOSED NOTABUG	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	2.1	CC:	peterm, riel
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:	public=20060107,impact=moderate
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-03-31 21:21:44 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:

Description Josh Bressers 2005-01-07 22:11:42 UTC

*** This bug has been split off bug 144524 ***

------- Original comment by Josh Bressers (Security Response Team) on 2005.01.07
17:08 -------

This was reported by grsecurity to full-disclosure
http://lists.netsys.com/pipermail/full-disclosure/2005-January/030660.html

the 'culprit' patch is how the default RLIM_MEMLOCK and the privilege
to call mlockall have changed in 2.6.9. namely, the former has been
reduced to 32 pages while the latter has been relaxed to allow it for
otherwise unprivileged users if their RLIM_MEMLOCK is bigger than the
currently allocated vm. which is normally good enough, except as you
now know there's a path that can increase the allocated vm without
checking for RLIM_MEMLOCK.


The fix for this issue is attachment 109501 [details]

Comment 2 Jason Baron 2005-03-31 21:21:44 UTC

In rhel2.1 x86 mlock is restricted to root. Non-root users can not lock memory,
thus this is not a bug.