Bug 204360

Summary:	CVE-2006-3741 sys_perfmonctl() file descriptor reference count issue
Product:	Red Hat Enterprise Linux 4	Reporter:	Marcel Holtmann <holtmann>
Component:	kernel	Assignee:	Anil S Keshavamurthy <akeshava>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.0	CC:	jbaron, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	ia64
OS:	Linux
Whiteboard:	impact=moderate,source=redhat,reported=20060826,embargo=20060906,public=20060908
Fixed In Version:	RHSA-2006-0689	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2006-10-05 19:19:39 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 Marcel Holtmann 2006-08-28 18:02:25 UTC

From Stephane Eranian:

I discovered a security problem with perfmon2.0 in mainline kernel. Under
certain circumstances, the perfmonctl() system call may not correctly manage the
file descriptor reference count. As a consequence, the system may run out of
file structure.

Comment 5 Anil S Keshavamurthy 2006-08-28 21:42:16 UTC

(In reply to comment #3)
> Use bug 204400 for RHEL3 then.
> 
Sorry about the noice here.. Checked the sources for RHEL3 U8 (kernel 2.4.21-47)
and looks like the fix is not required for RHEL3. I will go ahead and update the
bugzilla 204400.

Comment 8 Marcel Holtmann 2006-08-30 10:52:02 UTC

Running the test case on a system where the default nfile limits for a user are
still in place the user session will run out of file handles:

[test@bohr ~]$ ./test_fd1 
fopen: Too many open files in system
[test@bohr ~]$ bash
-bash: start_pipeline: pgrp pipe: Too many open files in system
-bash: /bin/bash: Too many open files in system

Any further login attempt for this user and all other non-privileged users will
fail after this test.

Since this affects all unprivileged users, it might affect unprivileged
processes like Apache childs etc.

Comment 9 Jason Baron 2006-09-22 00:39:47 UTC

committed in stream U5 build 42.13. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/

Comment 10 Jason Baron 2006-09-26 14:31:16 UTC

committed in stream E5 build 42.0.3

Comment 11 RHEL Program Management 2006-09-27 22:37:09 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 14 Red Hat Bugzilla 2006-10-05 19:19:39 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2006-0689.html