Messages in this thread | | | Date | Mon, 10 Aug 2020 19:29:36 +0200 | From | Greg Kroah-Hartman <> | Subject | Re: [PATCH 4.19 06/48] ALSA: seq: oss: Serialize ioctls |
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On Mon, Aug 10, 2020 at 06:37:17PM +0200, Pavel Machek wrote: > Hi! > > > commit 80982c7e834e5d4e325b6ce33757012ecafdf0bb upstream. > > > > Some ioctls via OSS sequencer API may race and lead to UAF when the > > port create and delete are performed concurrently, as spotted by a > > couple of syzkaller cases. This patch is an attempt to address it by > > serializing the ioctls with the existing register_mutex. > > > > Basically OSS sequencer API is an obsoleted interface and was designed > > without much consideration of the concurrency. There are very few > > applications with it, and the concurrent performance isn't asked, > > hence this "big hammer" approach should be good enough. > > That really is a "big hammer". And I believe it is too big.
Please discuss code architecture decisions on the mailing list for the subsystem/patch. Doing it in random stable backports does not help out as all of the developers involved are not copied here.
thanks,
greg k-h
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