Bug 201684 - CVE-2006-4093 Local DoS through uncleared HID0[31]
CVE-2006-4093 Local DoS through uncleared HID0[31]
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Janice Girouard - IBM on-site partner
Brian Brock
: Security
Depends On:
  Show dependency treegraph
Reported: 2006-08-08 06:34 EDT by Marcel Holtmann
Modified: 2012-05-19 19:38 EDT (History)
3 users (show)

See Also:
Fixed In Version: RHSA-2006-0689
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2006-10-05 15:18:35 EDT
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Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

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Description Marcel Holtmann 2006-08-08 06:34:17 EDT
Report from Olof Johansson:

On PPC970, having HID0[31] (en_attn) set makes it possible to wedge the machine
by just doing an 'asm volatile("attn");' from userspace, clearly a local DoS
exposure. Apple firmware seems to set it and we don't clear it at boot time.

I'm not aware of any intentional exploits of this. I happened to come across it
by running crash01 from LTP, it tries to execute random data as code and kept
locking up my machine.
Comment 1 Marcel Holtmann 2006-08-08 06:35:56 EDT
Created attachment 133779 [details]
Proposed patch from Olof Johansson
Comment 5 Jason Baron 2006-09-26 11:00:36 EDT
committed in stream E5 build 42.0.3
Comment 6 RHEL Product and Program Management 2006-09-27 18:38:38 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
Comment 8 Jason Baron 2006-09-28 11:52:23 EDT
committed in stream U5 build 42.14. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/
Comment 9 Jay Turner 2006-10-03 09:39:51 EDT
QE ack for 4.5.
Comment 11 Red Hat Bugzilla 2006-10-05 15:18:36 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.


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