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Bug 151249

Summary: CAN-2005-0736 epoll overflow
Product: Red Hat Enterprise Linux 4 Reporter: Mark J. Cox <mjc>
Component: kernelAssignee: Dave Jones <davej>
Status: CLOSED ERRATA QA Contact: Brian Brock <bbrock>
Severity: low Docs Contact:
Priority: medium    
Version: 4.0CC: pfrields, riel
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
URL: http://lists.grok.org.uk/pipermail/full-disclosure/2005-March/032314.html
Whiteboard: impact=low,source=vendorsec,reported=20050308,public=20050309
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2005-04-19 18:52:26 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 Mark J. Cox 2005-03-16 12:41:41 UTC 
Reported to vendor-sec from the kernel security list, originally from Georgi
Guninski.  

"It is possible to partially overwrite low kernel memory due to integer overflow
in sys_epoll_wait and misuse of __put_user in ep_send_events"

Note that this area usually doesn't actually contain anything (the first 4kB are
left alone for dosemu etc to read the original 16-bit interrupt descriptors, and
the rest is just about the last thing we ever allocate, so it's usually unused)

Fixed upstream, see
http://linux.bkbits.net:8080/linux-2.6/cset@422dd06a1p5PsyFhoGAJseinjEq3ew
Comment 2 Josh Bressers 2005-04-19 18:52:26 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-2005-366.html