linux-kernel - Re: WARNING in kmem_cache

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Message-ID: <4564679.HlOejCIXXz@positron.chronox.de>
Date:   Sun, 08 Apr 2018 17:31:46 +0200
From:   Stephan Müller <smueller@...onox.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     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@...glegroups.com, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: WARNING in kmem_cache_free

Am Sonntag, 8. April 2018, 13:18:06 CEST schrieb Dmitry Vyukov:

Hi Dmitry,

> 
> Running syz-repro utility on this log, I think I've found the guilty guy:
> https://gist.githubusercontent.com/dvyukov/1dd75d55efd238e7207af1cc38478b3a/
> raw/403859b56b161a6fbb158e8953fac5bb6e73b1a1/gistfile1.txt
> 

I am unable to reproduce it with the code. I am using the current 
cryptodev-2.6 tree with kazan enabled. Could you please give me your kernel 
config or a pointer of the used tree?

> It crashes as:
> BUG: KASAN: use-after-free in drbg_kcapi_seed+0x1178/0x12e0
> and:
> BUG: unable to handle kernel paging request at ffffebe000000020
> and with other indications of badly corrupted heap.
> 
> This points to crypto/drbg.c, so +crypto maintainers.


Ciao
Stephan