linux-kernel - Re: KASAN: use-after-free Read in crypto_aead_free

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Date:   Wed, 20 Dec 2017 11:15:38 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Stephan Mueller <smueller@...onox.de>
Cc:     syzbot 
        <bot+e5e6fab2d4dc3d9877ac240fed364027bb960ad0@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in crypto_aead_free_instance

On Wed, Dec 20, 2017 at 10:55 AM, Stephan Mueller <smueller@...onox.de> wrote:
> Am Mittwoch, 20. Dezember 2017, 10:50:10 CET schrieb Dmitry Vyukov:
>
> Hi Dmitry,
>
>> On Wed, Dec 20, 2017 at 10:29 AM, Stephan Mueller <smueller@...onox.de>
> wrote:
>> > Am Mittwoch, 20. Dezember 2017, 10:19:43 CET schrieb Dmitry Vyukov:
>> >
>> > Hi Dmitry,
>> >
>> >> > This issue vanishes after applying the patch "[PATCH v2] crypto: AF_ALG
>> >> > -
>> >> > limit mask and type".
>> >>
>> >> Hi Stephan,
>> >>
>> >> syzbot does not understand arbitrary English prose, it only understands
>> >
>> > this:
>> >> > Once a fix for this bug is merged into any tree, reply to this email
>> >> > with:
>> >> > #syz fix: exact-commit-title
>> >>
>> >> Let's tell it about the fix:
>> >>
>> >> #syz fix: crypto: AF_ALG - limit mask and type
>> >
>> > I have seen that this is the approach, but the fix is not yet in the tree.
>> > I just want to let folks know that there is a patch.
>>
>> Ah, ok, sorry. It's just difficult to tell when there is a reason to
>> not provide the tag right now, or when people are don't know about
>> them or ignore.
>> If the patch is merged with this title, then there is nothing else to
>> do. If it's merged under a different title, a new "#syz fix:" tag will
>> override the old one.
>
> Maybe you can teach the syzcaller that there is a proposed fix? E.g.
>
> #syz proposed: commit-title

What will be its meaning? How will it differ from fix?