On Fri 01-04-22 11:40:39, yukuai (C) wrote: > 在 2022/03/30 20:42, Jan Kara 写道: > > Hello, > > > > with a big delay (I'm sorry for that) here is the sixth version of my patches > > to fix use-after-free issues in BFQ when processes with merged queues get moved > > to different cgroups. The patches have survived some beating in my test VM, but > > so far I fail to reproduce the original KASAN reports so testing from people > > who can reproduce them is most welcome. Kuai, can you please give these patches > > a run in your setup? Thanks a lot for your help with fixing this! > > > Hi, Jan > > I ran the reproducer for more than 12 hours aready, and the uaf is not > reporduced anymore. Before this patchset this problem can be reporduced > within an hour. Great to hear that! Thanks a lot for testing and help with analysis! Can I add your Tested-by tag? Honza > > Changes since v5: > > * Added handling of situation when bio is submitted for a cgroup that has > > already went through bfq_pd_offline() > > * Convert bfq to avoid using deprecated __bio_blkcg() and thus fix possible > > races when returned cgroup can change while bfq is working with a request > > > > Changes since v4: > > * Even more aggressive splitting of merged bfq queues to avoid problems with > > long merge chains. > > > > Changes since v3: > > * Changed handling of bfq group move to handle the case when target of the > > merge has moved. > > > > Changes since v2: > > * Improved handling of bfq queue splitting on move between cgroups > > * Removed broken change to bfq_put_cooperator() > > > > Changes since v1: > > * Added fix for bfq_put_cooperator() > > * Added fix to handle move between cgroups in bfq_merge_bio() > > > > Honza > > Previous versions: > > Link: http://lore.kernel.org/r/20211223171425.3551-1-jack@xxxxxxx # v1 > > Link: http://lore.kernel.org/r/20220105143037.20542-1-jack@xxxxxxx # v2 > > Link: http://lore.kernel.org/r/20220112113529.6355-1-jack@xxxxxxx # v3 > > Link: http://lore.kernel.org/r/20220114164215.28972-1-jack@xxxxxxx # v4 > > Link: http://lore.kernel.org/r/20220121105503.14069-1-jack@xxxxxxx # v5 > > . > > -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
