Bug 1193907 (CVE-2015-0275)

Summary:	CVE-2015-0275 kernel: fs: ext4: fallocate zero range page size > block size BUG()
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aquini, bhu, carnil, dhoward, fhrbata, iboverma, jkacur, jross, kernel-mgr, lczerner, lgoncalv, matt, mcressma, nmurray, plougher, rvrbovsk, security-response-team, slawomir, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A flaw was found in the way the Linux kernel's ext4 file system handled the "page size > block size" condition when the fallocate zero range functionality was used. A local attacker could use this flaw to crash the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:38:53 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:
Bug Depends On:	1187071, 1193909, 1195178, 1252878, 1252880, 1252881
Bug Blocks:	1193911

Description Petr Matousek 2015-02-18 14:33:53 UTC

A flaw was found in the way the Linux kernel's EXT4 filesystem handled
page size > block size condition when fallocate zero range functionality
is used.

Acknowledgements:

This issue was discovered by Xiong Zhou of Red Hat.

Comment 2 Petr Matousek 2015-02-23 09:48:06 UTC

Upstream patch submission:

http://www.spinics.net/lists/linux-ext4/msg47193.html

Comment 3 Petr Matousek 2015-02-23 09:58:48 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6. This issue does affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2. Future updates in the respective releases may address this issue.

Comment 4 Petr Matousek 2015-02-23 10:36:24 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1195178]

Comment 5 Fedora Update System 2015-03-09 08:17:17 UTC

kernel-3.18.8-201.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2015-03-14 09:15:26 UTC

kernel-3.18.9-100.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 errata-xmlrpc 2015-09-15 09:23:39 UTC

This issue has been addressed in the following products:

  MRG for RHEL-6 v.2

Via RHSA-2015:1787 https://rhn.redhat.com/errata/RHSA-2015-1787.html

Comment 10 errata-xmlrpc 2015-09-15 09:39:26 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1788 https://rhn.redhat.com/errata/RHSA-2015-1788.html

Comment 11 errata-xmlrpc 2015-09-15 12:06:47 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1778 https://rhn.redhat.com/errata/RHSA-2015-1778.html