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Bug 149589

Summary:	CAN-2005-0209 netfilter SKB problem
Product:	Red Hat Enterprise Linux 4	Reporter:	Mark J. Cox <mjc>
Component:	kernel	Assignee:	David Miller <davem>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	high	Docs Contact:
Priority:	medium
Version:	4.0	CC:	davej, riel, tburke
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:	impact=important,public=20050124
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-04-19 18:52:25 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:

Description Mark J. Cox 2005-02-24 10:46:52 UTC

"If we forward a fragmented packet, we can have ip_summed set to
CHECKSUM_HW or similar.  This is fine for local protocol processing,
but once if we are forwarding this packet we want to reset ip_summed
to CHECKSUM_NONE."  This allows you to crash a host remotely using bad
fragments but only affects certain NICs.  Dave Miller said "Acenic and
SunGEM are the only two cards affected which are in widespread use."

Simple patch:
http://linux.bkbits.net:8080/linux-2.6/cset@41f59581p1swNaow4K1aBglV-q2jfQ

Comment 1 Josh Bressers 2005-04-19 18:52:25 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 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.

http://rhn.redhat.com/errata/RHSA-2005-366.html