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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: 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: impact=moderate,public=20150218,reported=20150217,source=redhat,cvss2=4.7/AV:L/AC:M/Au:N/C:N/I:N/A:C,rhel-5/kernel=notaffected,rhel-6/kernel=notaffected,rhel-7/kernel=affected,mrg-2/realtime-kernel=affected,rhel-7/kernel-rt=affected,fedora-all/kernel=affected
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: ---
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