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

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Message-ID: <CACT4Y+ZPvO-nEMJsHvzm9zPOdB803Eh9+UO_E++Wx6xBxw=mLA@mail.gmail.com>
Date:   Wed, 20 Dec 2017 12:59:43 +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 12:49 PM, Stephan Mueller <smueller@...onox.de> wrote:
> Am Mittwoch, 20. Dezember 2017, 11:15:38 CET schrieb Dmitry Vyukov:
>
> Hi Dmitry,
>
>>
>> What will be its meaning? How will it differ from fix?
>
> Maybe a short clarification would help: what is the meaning of the syz fix
> marker?

It's described here:
https://github.com/google/syzkaller/blob/master/docs/syzbot.md#bug-status-tracking

> Depending on this answer, all that I am thinking of is to mark bug
> reports for which there are fixes actively discussed, but yet not integrated.
> Thus, such marker should only help others to point them to active discussions
> instead of them trying to find fixes alone.

If it's only for humans, then there is no need to make a special
machine-readable command for this.
So basically what you wrote above is good:

> This issue vanishes after applying the patch "[PATCH v2] crypto: AF_ALG - limit mask and type".

I just didn't understand that's still pending (but perhaps that's what
you meant by including "[PATCH v2]" part).