linux-kernel - Re: usercopy whitelist woe in scsi_sense

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Message-Id: <1523959328.3250.11.camel@linux.vnet.ibm.com>
Date:   Tue, 17 Apr 2018 11:02:08 +0100
From:   James Bottomley <jejb@...ux.vnet.ibm.com>
To:     Kees Cook <keescook@...omium.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Jens Axboe <axboe@...nel.dk>,
        Bart Van Assche <bart.vanassche@....com>,
        Paolo Valente <paolo.valente@...aro.org>
Cc:     David Windsor <dave@...lcore.net>,
        "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 Mon, 2018-04-16 at 20:12 -0700, Kees Cook wrote:
> I still haven't figured this out, though... any have a moment to look
> at this?

Just to let you know you're not alone ... but I can't make any sense of
this either.  The bfdq is the elevator_data, which is initialised when
the scheduler is attached, so it shouldn't change.  Is it possible to
set a data break point on elevator_data after it's initialised and see
if it got changed by something?

James