Bug 137822 - CAN-2004-1057 VM_IO refcount issue
CAN-2004-1057 VM_IO refcount issue
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 2.1
Classification: Red Hat
Component: kernel (Show other bugs)
2.1
ia64 Linux
medium Severity low
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Assigned To: Jim Paradis
Brian Brock
impact=low,public=20041101
: Security
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2004-11-01 15:19 EST by Josh Bressers
Modified: 2013-08-05 21:09 EDT (History)
4 users (show)

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Doc Type: Bug Fix
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Last Closed: 2005-01-21 10:41:20 EST
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Description Josh Bressers 2004-11-01 15:19:57 EST
Alan Cox told vendor-sec the kernel policy on page locking allows DMA
to and from freed kernel pages/panic kernels because PG_Reserved pages
are not refcounted, but some kernel space gets remapped as driver
buffers.  Known to affect OSS audio, video, usb perhaps.

I'm marking this private for now.

See attachment 106045 [details] for the patch taken from 

http://www.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.23aa3/00_VM_IO-4
Comment 1 Jim Paradis 2004-11-05 17:49:00 EST
I believe this should be slated for U7
Comment 2 Jim Paradis 2004-12-21 14:13:24 EST
This patch has just been committed to the RHEL2.1 E7 patch pool (in
kernel version 2.4.18-e.53)
Comment 3 Josh Bressers 2005-01-21 10:41:20 EST
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-2005-017.html

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