Bug 1250030 (CVE-2015-5707)

Summary:	CVE-2015-5707 kernel: number wraparound vulnerability in function start_req()
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:	aquini, bhu, dhoward, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, madhu.chinakonda, mchehab, mcressma, nmurray, rt-maint, rvrbovsk, slong, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	An integer-overflow vulnerability was found in the scsi block-request handling code in function start_req(). A local attacker could use specially crafted IOV requests to overflow a counter used in bio_map_user_iov()'s page calculation, and write past the end of the array that contains kernel-page pointers.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-21 00:47:25 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:
Bug Depends On:	1250034, 1293521
Bug Blocks:	1250036

Description Adam Mariš 2015-08-04 11:45:20 UTC

This bug, which was probably introduced in Linux 2.6.28, was assigned CVE.
In drivers/scsi/sg.c in function start_req(), there was code segment vulnerable to number wraparound in the calculation of total number of pages in bio_map_user_iov().
This can result to allocating small array of pointers to pages that would be overflowed. It was fixed in Linux 4.1-rc1.

CVE assignment:
http://seclists.org/oss-sec/2015/q3/278

Upstream patches:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fdc81f45e9f57858da6351836507fbcf1b7583ee
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=451a2886b6bf90e2fb378f7c46c655450fb96e81

Comment 1 Adam Mariš 2015-08-04 11:55:22 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1250034]

Comment 2 Wade Mealing 2015-12-22 01:27:17 UTC

Statement:

This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 6, 7 MRG-2 and realtime kernels and does not plan be addressed in a future update.