linux-kernel - Re: usercopy whitelist woe in scsi_sense

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Message-ID: <CAGXu5jLcrymg8bDXB=MRKwwAqN2Y=qMeO4PNDQ_t4DekyOk+JQ@mail.gmail.com>
Date:   Tue, 17 Apr 2018 09:25:15 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Bart Van Assche <bart.vanassche@....com>,
        Paolo Valente <paolo.valente@...aro.org>,
        David Windsor <dave@...lcore.net>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Hannes Reinecke <hare@...e.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        linux-block@...r.kernel.org
Subject: Re: usercopy whitelist woe in scsi_sense_cache

On Tue, Apr 17, 2018 at 2:19 AM, Oleksandr Natalenko
<oleksandr@...alenko.name> wrote:
> By any chance, have you tried to simplify the reproducer environment, or it
> still needs my complex layout to trigger things even with KASAN?

I haven't tried minimizing the reproducer yet, no. Now that I have a
specific place to watch in the kernel for the corruption, though, that
might help. If I get stuck again today, I'll try it.

-Kees

-- 
Kees Cook
Pixel Security