linux-kernel - Re: [PATCH] crypto: DRBG - guard uninstantion by lock

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Message-ID: <117191397.rLtE3Es1ot@tauon.chronox.de>
Date:   Wed, 11 Apr 2018 14:59:59 +0200
From:   Stephan Mueller <smueller@...onox.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     "Theodore Y. Ts'o" <tytso@....edu>,
        Matthew Wilcox <willy@...radead.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        David Miller <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, Eric Biggers <ebiggers3@...il.com>,
        syzbot <syzbot+75397ee3df5c70164154@...kaller.appspotmail.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] crypto: DRBG - guard uninstantion by lock

Am Mittwoch, 11. April 2018, 14:29:45 CEST schrieb Dmitry Vyukov:

Hi Dmitry,
> 
> What do you mean by description of the fault?
> It's kernel standard FAULT_INJECTION facility, it injects faults
> mainly into kmalloc/slab_alloc (also in a bunch of other things, but
> in this case this seems to be kmalloc). In the repro you can see that
> it's injecting a fault into 8-th malloc in the setsockopt syscall.

I am now able to reproduce it.

I think I have a smoking gun, but let me test it first.

Ciao
Stephan