Bug 1220760 (CVE-2021-47016)

Summary: VUL-0: CVE-2021-47016: kernel: m68k: mvme147,mvme16x: Don't wipe PCC timer config bits
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Security Team bot <security-team>
Status: RESOLVED INVALID QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: andrea.mattiazzo, mhocko
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/395863/
Whiteboard: CVSSv3.1:SUSE:CVE-2021-47016:4.4:(AV:L/AC:L/PR:H/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 2024-03-01 11:02:09 UTC 
In the Linux kernel, the following vulnerability has been resolved:

m68k: mvme147,mvme16x: Don't wipe PCC timer config bits

Don't clear the timer 1 configuration bits when clearing the interrupt flag
and counter overflow. As Michael reported, "This results in no timer
interrupts being delivered after the first. Initialization then hangs
in calibrate_delay as the jiffies counter is not updated."

On mvme16x, enable the timer after requesting the irq, consistent with
mvme147.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47016
https://www.cve.org/CVERecord?id=CVE-2021-47016
https://bugzilla.redhat.com/show_bug.cgi?id=2267200
https://lore.kernel.org/linux-cve-announce/2024022919-CVE-2021-47016-320d@gregkh/T/#u

Patch:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=43262178c043
Comment 1 Andrea Mattiazzo 2024-03-01 11:05:54 UTC 
Tracking as affected:
- cve/linux-5.3

Below cve/linux-5.3 are not affected. cve/linux-5.14, stable and SLE15-SP6 are already patched.
Comment 2 Andrea Mattiazzo 2024-03-01 11:24:56 UTC 
Just recognize that CONFIG_MVME16x and CONFIG_MVME147 is not set on cve/linux-5.3, so affected files are not built. Closing.
Comment 4 Michal Hocko 2024-04-26 17:00:32 UTC 
m68k is not a supported architecture. This one is invalid. Please close so