Bug 1776838 (CVE-2019-19083)

Summary:	CVE-2019-19083 kernel: memory leaks in *clock_source_create() functions under drivers/gpu/drm/amd/display/dc leads to DoS
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	acaringi, airlied, bdettelb, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mcressma, mjg59, mlangsdo, nmurray, qzhao, rt-maint, rvrbovsk, steved, 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:	A memory leak flaw was found in the Linux kernel. A system crash occurs under very specific, hard to obtain conditions, when the AMD GPU Display Engine configuration initialization handles resource cleaning when a failure occurs. The highest threat from this vulnerability is system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-25 22:13:52 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:	1776839, 1825125, 1825126, 1825127, 1825128, 1825129
Bug Blocks:	1776840

Description Guilherme de Almeida Suckevicz 2019-11-26 13:35:29 UTC

Memory leaks in *clock_source_create() functions under drivers/gpu/drm/amd/display/dc in the Linux kernel before 5.3.8 allow attackers to cause a denial of service (memory consumption). This affects the dce112_clock_source_create() function in drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c, the dce100_clock_source_create() function in drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c, the dcn10_clock_source_create() function in drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c, the dcn20_clock_source_create() function in drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c, the dce120_clock_source_create() function in drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c, the dce110_clock_source_create() function in drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c, and the dce80_clock_source_create() function in drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c, aka CID-055e547478a1.

Reference and upstream commit:
https://github.com/torvalds/linux/commit/055e547478a11a6360c7ce05e2afc3e366968a12

Comment 1 Guilherme de Almeida Suckevicz 2019-11-26 13:36:19 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1776839]

Comment 2 Justin M. Forbes 2019-11-26 14:14:38 UTC

This was fixed for Fedora with the 5.3.8 stable kernel updates.

Comment 4 Petr Matousek 2020-04-17 06:42:45 UTC

Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Comment 6 Eric Christensen 2020-04-17 16:18:16 UTC

Statement:

This issue is rated as having a Low impact because of the preconditions needed to trigger the resource cleanup code path (system-wide out-of-memory condition).