Bug 190073

Summary: CVE-2006-2071 mprotect gives write permission to a readonly attachment
Product: Red Hat Enterprise Linux 4 Reporter: Marcel Holtmann <holtmann>
Component: kernelAssignee: Jason Baron <jbaron>
Status: CLOSED ERRATA QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 4.0CC: knoel, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: impact=moderate,public=20060417
Fixed In Version: RHSA-2006-0689 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2006-10-05 19:17:20 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:
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Description Flags
reproducer none

Description Marcel Holtmann 2006-04-27 11:17:00 UTC 
All of 2.4 and 2.6 kernels have been letting mprotect give write permission to a
readonly attachment of shared memory, whether or not IPC would give the caller
that permission.

SUS says "The behaviour of this function [mprotect] is unspecified if the
mapping was not established by a call to mmap", but I don't think we can
interpret that as allowing it to subvert IPC permissions.
Comment 1 Marcel Holtmann 2006-04-27 11:28:22 UTC 
The upstream fix can be found here:

http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b78b6af66a5fbaf17d7e6bfc32384df5e34408c8
Comment 2 Marcel Holtmann 2006-04-27 17:24:15 UTC 
This is _not_ CVE-2006-1524. The commit message of the upstream fix is wrong.
Comment 4 Jason Baron 2006-06-01 15:58:55 UTC 
Created attachment 130353 [details]
reproducer

better test program. returns PASS, FAIL, or ABORT.
Comment 5 Jason Baron 2006-08-21 20:47:19 UTC 
committed in stream U5 build 42.2. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/
Comment 6 Jason Baron 2006-09-26 14:30:00 UTC 
committed in stream E5 build 42.0.3
Comment 7 RHEL Program Management 2006-09-27 21:32:35 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 9 Jay Turner 2006-10-03 13:39:29 UTC 
QE ack for 4.5.
Comment 11 Red Hat Bugzilla 2006-10-05 19:17:20 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