Bug 1597814 (CVE-2018-13100)

Summary:	CVE-2018-13100 kernel: divide-by-zero in fs/f2fs/super.c
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	abhgupta, airlied, aquini, bhu, bskeggs, dbaker, dhoward, esammons, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jokerman, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, lwang, matt, mchehab, mcressma, mguzik, mjg59, nmurray, plougher, rvrbovsk, skozina, slawomir, steved, sthangav, trankin, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An issue was discovered in fs/f2fs/super.c in the Linux kernel, which does not properly validate secs_per_zone in a corrupted f2fs image. This may lead to a divide-by-zero error and a system crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-07-10 11:50:05 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:	1597816, 1597819
Bug Blocks:	1597817

Description Laura Pardo 2018-07-03 16:30:43 UTC

An issue was discovered in fs/f2fs/super.c in the Linux kernel, which does not properly validate secs_per_zone in a corrupted f2fs image, which may lead to a divide-by-zero error and a system crash.

References:

https://bugzilla.kernel.org/show_bug.cgi?id=200183 	

A suggested upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git/commit/?h=f2fs-dev&id=977f9bb558cb4a95d53b10301f5c739ed8867d4d

Comment 1 Laura Pardo 2018-07-03 16:32:21 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1597816]

Comment 6 Vladis Dronov 2018-07-10 11:50:05 UTC

Note:

An F2FS filesystem is not shipped with any of the Red Hat products.

Comment 7 Justin M. Forbes 2018-09-11 20:56:43 UTC

This issue is fixed for Fedora with the 4.18 rebases.