Bug 1489078 (CVE-2017-12146)

Summary:	CVE-2017-12146 kernel: Race condition in driver_override implementation
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, eparis, esammons, esandeen, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, lwang, matt, mchehab, mcressma, mguzik, mjg59, mlangsdo, nhorman, nmurray, plougher, quintela, rt-maint, rvrbovsk, slawomir, vdronov, williams, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.13	Doc Type:	Bug Fix
Doc Text:	It was found that the driver_override implementation in base/platform.c in the Linux kernel is susceptible to race condition when different threads are reading vs storing a different driver override.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-09-21 16:25:35 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:	1489079, 1494199
Bug Blocks:	1489083

Description Adam Mariš 2017-09-06 16:10:26 UTC

It was found that the driver_override implementation in base/platform.c is susceptible to race condition when different threads are reading vs storing a different driver override.

Upstream patch:

https://github.com/torvalds/linux/commit/6265539776a0810b7ce6398c27866ddb9c6bd154

Introduced by commit:

https://github.com/torvalds/linux/commit/3d713e0e382e

Comment 1 Adam Mariš 2017-09-06 16:11:48 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1489079]

Comment 2 Adam Mariš 2017-09-06 16:48:17 UTC

External References:

https://source.android.com/security/bulletin/2017-09-01

Comment 3 Justin M. Forbes 2017-09-06 18:06:05 UTC

This was fixed in the 4.12.1 stable release and is on all currently supported Fedora releases.

Comment 7 Vladis Dronov 2017-09-21 16:24:09 UTC

Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG-2 as the code with the flaw is not present in the products listed.