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Bug 144136

Summary: CAN-2004-1235 isec.pl do_brk() privilege escalation
Product: Red Hat Enterprise Linux 4 Reporter: Josh Bressers <bressers>
Component: kernelAssignee: Dave Jones <davej>
Status: CLOSED ERRATA QA Contact: Brian Brock <bbrock>
Severity: high Docs Contact:
Priority: medium    
Version: 4.0CC: jbaron, pfrields, riel, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: reported=20041222,public=20050106,impact=important
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2005-02-18 17:21:07 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:    
Bug Blocks: 144195    
Attachments:
Description Flags
Proposed patch for this issue. none

Description Josh Bressers 2005-01-04 19:39:06 UTC 
isec.pl reported a missing down() on mmap_sem semaphore whilst calling do_brk;
so if do_brk() sleeps on a kmalloc it may get into a VMA list race - leading to
results similar to the do_brk exploit.
Comment 2 Josh Bressers 2005-01-04 19:49:58 UTC 
Created attachment 109344 [details]
Proposed patch for this issue.
Comment 3 Mark J. Cox 2005-01-10 09:28:25 UTC 
Removing embargo
Comment 4 Josh Bressers 2005-02-18 17:21:07 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-2005-092.html