Bug 151249 - CAN-2005-0736 epoll overflow
CAN-2005-0736 epoll overflow
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
4.0
All Linux
medium Severity low
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Assigned To: Dave Jones
Brian Brock
http://lists.grok.org.uk/pipermail/fu...
impact=low,source=vendorsec,reported=...
: Security
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2005-03-16 07:41 EST by Mark J. Cox (Product Security)
Modified: 2015-01-04 17:17 EST (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2005-04-19 14:52:26 EDT
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Description Mark J. Cox (Product Security) 2005-03-16 07:41:41 EST
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 14:52:26 EDT
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

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