Re: [PATCH for-6.12 0/4] block, bfq: fix corner cases related to bfqq merging

[Jens Axboe]

On 9/3/24 7:32 PM, Yu Kuai wrote:
> Hi,
> 
> 在 2024/09/03 23:51, Jens Axboe 写道:
>> On 9/2/24 7:03 AM, Yu Kuai wrote:
>>> From: Yu Kuai <yukuai3@xxxxxxxxxx>
>>>
>>> Our syzkaller report a UAF problem(details in patch 1), however it can't
>>> be reporduced. And this set are some corner cases fix that might be
>>> related, and they are found by code review.
>>>
>>> Yu Kuai (4):
>>>    block, bfq: fix possible UAF for bfqq->bic with merge chain
>>>    block, bfq: choose the last bfqq from merge chain in
>>>      bfq_setup_cooperator()
>>>    block, bfq: don't break merge chain in bfq_split_bfqq()
>>>    block, bfq: use bfq_reassign_last_bfqq() in bfq_bfqq_move()
>>>
>>>   block/bfq-cgroup.c  |  7 +------
>>>   block/bfq-iosched.c | 17 +++++++++++------
>>>   block/bfq-iosched.h |  2 ++
>>>   3 files changed, 14 insertions(+), 12 deletions(-)
>>
>> BFQ is effectively unmaintained, and has been for quite a while at
>> this point. I'll apply these, thanks for looking into it, but I think we
>> should move BFQ to an unmaintained state at this point.
> 
> Sorry to hear that, we would be willing to take on the responsibility of
> maintaining this code, please let me know if there are any specific
> guidelines or processes we should follow. We do have customers are using
> bfq in downstream kernels, and we are still running lots of test for
> bfq.

Most important is just reviewing fixes and tending to bug reports, and
then collecting those fixes and sending them out to the list+me for
inclusion. Not much more needs to happen, this series is a good example
of it.

-- 
Jens Axboe