Bug 218003 - pci: Unaligned config read/write overflow
Summary: pci: Unaligned config read/write overflow
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: xen
Version: 5.0
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
: ---
Assignee: Rik van Riel
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2006-12-01 06:11 UTC by Herbert Xu
Modified: 2007-11-30 22:07 UTC (History)
1 user (show)

Fixed In Version: RC
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2007-02-08 01:10:57 UTC
Target Upstream Version:
Embargoed:

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Description Herbert Xu 2006-12-01 06:11:08 UTC 
Changesets 12586+12649 from xen-unstable.

[QEMU] pci: Unaligned config read/write overflow

The default config read/write handlers allows a 4-byte read/write at
address 255.  This can clobber the field after the config area.  This
happens to be the PCIBus pointer in the PCIDevice structure.

This patch stops this from reducing the read/write to the (largest
multiple of 2) number of bytes within the config area.

Signed-off-by: Herbert Xu <herbert.org.au>

[QEMU] Simpler workaround for guest writes to PCI config
space that extend past byte 0xff.
Signed-off-by: Keir Fraser <keir>
Comment 1 Jay Turner 2006-12-01 14:29:23 UTC 
QE ack for RHEL5.
Comment 3 RHEL Program Management 2007-02-08 01:10:57 UTC 
A package has been built which should help the problem described in 
this bug report. This report is therefore being closed with a resolution 
of CURRENTRELEASE. You may reopen this bug report if the solution does 
not work for you.
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