Bugzilla – Bug 1220835
VUL-0: CVE-2023-52485: kernel: drm/amd/display: Wake DMCUB before sending a command cause deadlock
Last modified: 2024-06-25 18:14:34 UTC
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Wake DMCUB before sending a command [Why] We can hang in place trying to send commands when the DMCUB isn't powered on. [How] For functions that execute within a DC context or DC lock we can wrap the direct calls to dm_execute_dmub_cmd/list with code that exits idle power optimizations and reallows once we're done with the command submission on success. For DM direct submissions the DM will need to manage the enter/exit sequencing manually. We cannot invoke a DMCUB command directly within the DM execution helper or we can deadlock. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-52485 https://www.cve.org/CVERecord?id=CVE-2023-52485 https://git.kernel.org/stable/c/303197775a97416b62d4da69280d0c120a20e009 https://git.kernel.org/stable/c/8892780834ae294bc3697c7d0e056d7743900b39 https://bugzilla.redhat.com/show_bug.cgi?id=2267195
a bit confusing for me, I would think this goes back to e97cc04fe0fb (i.e. 6.5) at the very least. But the fix is only in 6.7.3 and 6.8-rc1, but is not in 6.6.x.
Takashi, this seems to be in your area.
We already bumped the DRM stuff up to 6.7, so we could simply backport from 6.7.y. Now bakported to SLE15-SP6 branch. Older branches unaffected (or unfixable from the patch). Reassigned back to security team.
All done, closing.