Bug 684275 – kernel: BUG: warning at drivers/char/tty_audit.c:55/tty_audit_buf_free() [rhel-6.0.z]

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Bug 684275 - kernel: BUG: warning at drivers/char/tty_audit.c:55/tty_audit_buf_free() [rhel-6.0.z]

Summary:	kernel: BUG: warning at drivers/char/tty_audit.c:55/tty_audit_buf_free() [rhe...

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	6.0
Hardware:	x86_64 Linux

Priority	urgent Severity high
Target Milestone:	rc
Target Release:	---
Assigned To:	Frantisek Hrbata
QA Contact:	Eryu Guan
Docs Contact:

URL:
Whiteboard:
Keywords:	ZStream

Depends On:	680126
Blocks:
	Show dependency tree / graph

Reported:	2011-03-11 11:36 EST by RHEL Product and Program Management
Modified:	2011-05-10 14:13 EDT (History)
CC List:	10 users (show)

See Also:
Fixed In Version:	kernel-2.6.32-71.26.1.el6
Doc Type:	Bug Fix
Doc Text:	Using the pam_tty_audit.so module (which enables or disables TTY auditing for specified users) in the /etc/pam.d/sudo file and in the /etc/pam.d/system-auth file when the audit package is not installed resulted in soft lock-ups on CPUs. As a result, the kernel became unresponsive. This was due to the kernel exiting immediately after TTY auditing was disabled, without emptying the buffer, which caused the kernel to spin in a loop, copying 0 bytes at each iteration and attempting to push each time without any effect. With this update, a locking mechanism is introduced to prevent the aforementioned behavior.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2011-05-10 14:13:16 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2011:0498	normal	SHIPPED_LIVE	Important: kernel security, bug fix, and enhancement update	2011-05-10 14:10:04 EDT

Groups: None (edit)

Description RHEL Product and Program Management 2011-03-11 11:36:52 EST

This bug has been copied from bug #680126 and has been proposed
to be backported to 6.0 z-stream (EUS).

Comment 5 KernelOops Bot 2011-04-26 01:16:09 EDT

 with this guiltyfunc:  bug 680126

Comment 7 Martin Prpič 2011-05-05 04:58:08 EDT

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Using the pam_tty_audit.so module (which enables or disables TTY auditing for specified users) in the /etc/pam.d/sudo file and in the /etc/pam.d/system-auth file when the audit package is not installed resulted in soft lock-ups on CPUs. As a result, the kernel became unresponsive. This was due to the kernel exiting immediately after TTY auditing was disabled, without emptying the buffer, which caused the kernel to spin in a loop, copying 0 bytes at each iteration and attempting to push each time without any effect. With this update, a locking mechanism is introduced to prevent the aforementioned behavior.

Comment 8 errata-xmlrpc 2011-05-10 14:13:16 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 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-2011-0498.html

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