Bug 1525222 (CVE-2017-15128)

Summary:	CVE-2017-15128 kernel: Out of bound access in hugetlb_mcopy_atomic_pte function in mm/hugetlb.c
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
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, carnil, dhoward, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jkacur, john.j5live, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, linville, mchehab, mcressma, mjg59, mlangsdo, nmurray, rt-maint, rvrbovsk, skozina, slawomir, steved, williams, wmealing
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 flaw was found in the Linux kernel where a local user with a shell account can abuse the userfaultfd syscall when using hugetlbfs. A missing size check in hugetlb_mcopy_atomic_pte could create an invalid inode variable, leading to a kernel panic.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-27 10:54:08 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:	1545043, 1545044
Bug Blocks:	1518303

Description Pedro Sampaio 2017-12-12 20:06:23 UTC

A flaw was found in Linux kernel. A lack of size check in hugetlb_mcopy_atomic_pte could cause denial of service.

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1e3921471354244f70fe268586ff94a97a6dd4df

References:

https://marc.info/?l=linux-mm&m=150819356125109

Comment 1 Salvatore Bonaccorso 2018-01-08 19:47:50 UTC

Hi Pedro,

The link referenced is not accessible, is this issue https://marc.info/?l=linux-mm&m=150819356125109 and fixed with upstream 1e3921471354244f70fe268586ff94a97a6dd4df ?

Regards,
Salvatore

Comment 2 Pedro Sampaio 2018-01-08 20:12:52 UTC

Hi Salvatore,

Yes, I believe so. I didn't realize the link wasn't public.

Thanks.

Comment 3 Salvatore Bonaccorso 2018-01-10 19:47:01 UTC

Hi Pedro,

Many thanks for confirming!

Regards,
Salvatore

Comment 8 Eric Christensen 2018-01-23 15:32:04 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6 and kernel-alt.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7, realtime and MRG-2. Future Linux kernel updates for the respective releases may address this issue.

Comment 11 Wade Mealing 2018-02-14 06:45:09 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1545043]

Comment 12 Wade Mealing 2018-02-14 06:45:16 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1545044]

Comment 13 Justin M. Forbes 2018-02-14 14:42:14 UTC

This was fixed for Fedora with the 4.13.12 stable updates.