Bug 2266376 (CVE-2021-46917)

Summary: CVE-2021-46917 kernel: wq reset does not clear WQCFG registers
Product: [Other] Security Response Reporter: Rohit Keshri <rkeshri>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: acaringi, allarkin, aquini, bhu, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, drow, dvlasenk, esandeen, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mleitner, mmilgram, mstowell, nmurray, ptalbert, rparrazo, rrobaina, rvrbovsk, rysulliv, scweaver, sukulkar, tglozar, tyberry, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Bug Depends On: 2266383    
Bug Blocks: 2266369    

Description Rohit Keshri 2024-02-27 17:39:48 UTC 
In the Linux kernel, the following vulnerability has been resolved:

dmaengine: idxd: fix wq cleanup of WQCFG registers

A pre-release silicon erratum workaround where wq reset does not clear
WQCFG registers was leaked into upstream code. Use wq reset command
instead of blasting the MMIO region. This also address an issue where
we clobber registers in future devices.

https://git.kernel.org/stable/c/e5eb9757fe4c2392e069246ae78badc573af1833
https://git.kernel.org/stable/c/ea9aadc06a9f10ad20a90edc0a484f1147d88a7a
https://git.kernel.org/stable/c/f7dc8f5619165e1fa3383d0c2519f502d9e2a1a9
Comment 1 Rohit Keshri 2024-02-27 17:57:38 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2266383]
Comment 3 Justin M. Forbes 2024-02-27 18:23:44 UTC 
This was fixed for Fedora with the 5.11.16 stable kernel update.