Bug 1227787 (CVE-2024-40924)

Summary:	VUL-0: CVE-2024-40924: kernel: drm/i915/dpt: make DPT object unshrinkable
Product:	[Novell Products] SUSE Security Incidents	Reporter:	SMASH SMASH <smash_bz>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	RESOLVED FIXED	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	camila.matos, miroslav.franc
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/413851/
Whiteboard:	CVSSv3.1:SUSE:CVE-2024-40924:5.5:(AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description SMASH SMASH 2024-07-15 12:03:09 UTC

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

drm/i915/dpt: Make DPT object unshrinkable

In some scenarios, the DPT object gets shrunk but
the actual framebuffer did not and thus its still
there on the DPT's vm->bound_list. Then it tries to
rewrite the PTEs via a stale CPU mapping. This causes panic.

[vsyrjala: Add TODO comment]
(cherry picked from commit 51064d471c53dcc8eddd2333c3f1c1d9131ba36c)

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-40924
https://www.cve.org/CVERecord?id=CVE-2024-40924
https://git.kernel.org/stable/c/327280149066f0e5f2e50356b5823f76dabfe86e
https://git.kernel.org/stable/c/43e2b37e2ab660c3565d4cff27922bc70e79c3f1
https://git.kernel.org/stable/c/7a9883be3b98673333eec65c4a21cc18e60292eb
https://git.kernel.org/stable/c/a2552020fb714ff357182c3c179abfac2289f84d
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-40924.mbox