linux-kernel - Re: Cramfs: "unable to handle kernel paging request" when reading a file from a fuzzed FS image

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Message-ID: <nycvar.YSQ.7.76.1810282336440.1498@knanqh.ubzr>
Date:   Sun, 28 Oct 2018 23:43:07 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Anatoly Trosinenko <anatoly.trosinenko@...il.com>
cc:     linux-kernel@...r.kernel.org
Subject: Re: Cramfs: "unable to handle kernel paging request" when reading
 a file from a fuzzed FS image

On Sun, 28 Oct 2018, Anatoly Trosinenko wrote:

> Hello,
> 
> When reading a file from a fuzzed cramfs image, unhandled kernel
> paging request occurs.

Hmmm... It doesn't show up on my test system.

> How to reproduce with kvm-xfstests:
> 1) Checkout the v4.19 tag, copy x86_64-config-4.14 to .config, perform
> `make olddefconfig`
> 2) Enable Cramfs in the config, then compile
> 3) In the `kvm-xfstests shell` perform:
> 
> root@...-xfstests:~# mount /vtmp
> root@...-xfstests:~# mount /vtmp/cramfs.img /mnt

How do I populate /vtmp? Mine is empty at this point. I imagine I should 
put the cramfs image somewhere on the host, but I'm not that familiar 
withkvm.


Nicolas