Red Hat Bugzilla – Bug 137822
CAN-2004-1057 VM_IO refcount issue
Last modified: 2013-08-05 21:09:31 EDT
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
I believe this should be slated for U7
This patch has just been committed to the RHEL2.1 E7 patch pool (in
kernel version 2.4.18-e.53)
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.