Bug 1220956 (CVE-2021-47088)

Summary:	VUL-0: CVE-2021-47088: kernel: mm/damon/dbgfs: protect targets destructions with kdamond_lock
Product:	[Novell Products] SUSE Security Incidents	Reporter:	SMASH SMASH <smash_bz>
Component:	Incidents	Assignee:	Kernel Bugs <kernel-bugs>
Status:	RESOLVED FIXED	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P5 - None	CC:	rfrohl
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/396234/
Whiteboard:
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description SMASH SMASH 2024-03-05 10:48:13 UTC

In the Linux kernel, the following vulnerability has been resolved:

mm/damon/dbgfs: protect targets destructions with kdamond_lock

DAMON debugfs interface iterates current monitoring targets in
'dbgfs_target_ids_read()' while holding the corresponding
'kdamond_lock'.  However, it also destructs the monitoring targets in
'dbgfs_before_terminate()' without holding the lock.  This can result in
a use_after_free bug.  This commit avoids the race by protecting the
destruction with the corresponding 'kdamond_lock'.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47088
https://www.cve.org/CVERecord?id=CVE-2021-47088
https://git.kernel.org/stable/c/330c6117a82c16a9a365a51cec5c9ab30b13245c
https://git.kernel.org/stable/c/34796417964b8d0aef45a99cf6c2d20cebe33733

Comment 1 Robert Frohl 2024-03-05 11:00:08 UTC

does not affect any of our kernels, closing