Subject: Re: [PATCH] block, bfq: fix uaf for bfqq in bic_set_bfqq()
To:     Yu Kuai <yukuai1@huaweicloud.com>, jack@suse.cz, tj@kernel.org,
        josef@toxicpanda.com, axboe@kernel.dk, paolo.valente@linaro.org,
        shinichiro.kawasaki@wdc.com
Cc:     cgroups@vger.kernel.org, linux-block@vger.kernel.org,
        linux-kernel@vger.kernel.org, yi.zhang@huawei.com,
        yangerkun@huawei.com
References: <20230113094410.2907223-1-yukuai3@huawei.com>
 <ca9fefd4-7109-042c-3b25-9eb795141145@huaweicloud.com>
From:   =?UTF-8?Q?Holger_Hoffst=c3=a4tte?= <holger@applied-asynchrony.com>
Organization: Applied Asynchrony, Inc.
Message-ID: <3e8c8567-f41d-66ae-0633-dcdbed007228@applied-asynchrony.com>
Date:   Tue, 21 Feb 2023 11:19:21 +0100
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In-Reply-To: <ca9fefd4-7109-042c-3b25-9eb795141145@huaweicloud.com>
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On 2023-02-21 08:04, Yu Kuai wrote:
> Hi, Jens
> 
> 在 2023/01/13 17:44, Yu Kuai 写道:
>> After commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'"),
>> bic->bfqq will be accessed in bic_set_bfqq(), however, in some context
>> bic->bfqq will be freed first, and bic_set_bfqq() is called with the freed
>> bic->bfqq.
>>
>> Fix the problem by always freeing bfqq after bic_set_bfqq().
>>
>> Fixes: 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'")
>> Reported-and-tested-by: Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
>> Signed-off-by: Yu Kuai <yukuai3@huawei.com>
>> ---
>>   block/bfq-cgroup.c  | 2 +-
>>   block/bfq-iosched.c | 4 +++-
>>   2 files changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
>> index a6e8da5f5cfd..feb13ac25557 100644
>> --- a/block/bfq-cgroup.c
>> +++ b/block/bfq-cgroup.c
>> @@ -749,8 +749,8 @@ static void bfq_sync_bfqq_move(struct bfq_data *bfqd,
>>            * old cgroup.
>>            */
>>           bfq_put_cooperator(sync_bfqq);
>> -        bfq_release_process_ref(bfqd, sync_bfqq);
>>           bic_set_bfqq(bic, NULL, true, act_idx);
>> +        bfq_release_process_ref(bfqd, sync_bfqq);
>>       }
>>   }
>>
> 
> It seems this change is missed in GIT PULL for-6.3. I'll send a seperate
> patch to fix this...
> 

It was already applied in time for 6.2 as b600de2d7d3a16f9007fad1bdae82a3951a26af2
and also already merged to 6.1-stable.

cheers
Holger