Bug 456218

Summary: kernel: serial open/close loop disables irq [rhel-5.3]
Product: Red Hat Enterprise Linux 5 Reporter: Eugene Teo (Security Response) <eteo>
Component: kernelAssignee: Eugene Teo (Security Response) <eteo>
Status: CLOSED ERRATA QA Contact: Martin Jenner <mjenner>
Severity: low Docs Contact:
Priority: low    
Version: 5.3CC: dzickus, lwang
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2009-01-20 20:22:39 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
Upstream patch for this issue
none
Proposed backported patch
none
Reproducer none

Description Eugene Teo (Security Response) 2008-07-22 09:51:49 UTC
A Debian user reported that a simple program that repeatedly opens and closes a
serial device will eventually cause an irq line to be disabled.

References:
http://bugzilla.kernel.org/show_bug.cgi?id=7750
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=404815

Comment 2 Eugene Teo (Security Response) 2008-07-22 09:55:50 UTC
Created attachment 312322 [details]
Upstream patch for this issue

Comment 3 Eugene Teo (Security Response) 2008-07-22 09:59:10 UTC
Created attachment 312323 [details]
Proposed backported patch

Comment 4 Eugene Teo (Security Response) 2008-07-22 10:00:13 UTC
Created attachment 312324 [details]
Reproducer

Source: http://bugzilla.kernel.org/attachment.cgi?id=9958&action=view

Comment 5 Eugene Teo (Security Response) 2008-07-22 10:09:14 UTC
The bug is reported to be reproducible if the kernel is compiled with
CONFIG_PREEMPT_NONE=y. I have tested this on rhel-4, and rhel-5, but without
success. On rhel-5, the kernel is compiled with CONFIG_PREEMPT_VOLUNTARY=y, and
/dev/ttyS* are not accessible to local unprivileged users (unless you are in
uucp group for /dev/ttyS[1-3]). Let's get it fixed anyway.

Comment 7 RHEL Program Management 2008-07-22 13:31:48 UTC
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
release.

Comment 8 Don Zickus 2008-07-25 20:26:56 UTC
in kernel-2.6.18-100.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 12 errata-xmlrpc 2009-01-20 20:22:39 UTC
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 therefore 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-2009-0225.html