linux-kernel - Re: usercopy whitelist woe in scsi_sense

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Message-ID: <CAGXu5j+-PNYxSc3v+QtQLK0S3wdtFthFSxNM_69kFDnPQX0Gaw@mail.gmail.com>
Date:   Wed, 11 Apr 2018 17:03:38 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:     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>, Jens Axboe <axboe@...nel.dk>,
        Hannes Reinecke <hare@...e.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        linux-block@...r.kernel.org, paolo.valente@...aro.org
Subject: Re: usercopy whitelist woe in scsi_sense_cache

On Wed, Apr 11, 2018 at 3:47 PM, Kees Cook <keescook@...omium.org> wrote:
> On Tue, Apr 10, 2018 at 8:13 PM, Kees Cook <keescook@...omium.org> wrote:
>> I'll see about booting with my own kernels, etc, and try to narrow this down. :)
>
> If I boot kernels I've built, I no longer hit the bug in this VM
> (though I'll keep trying). What compiler are you using?

Ignore that: I've reproduced it with my kernels now. I think I messed
up the initramfs initially. But with an exact copy of your .config,
booting under Arch grub with initramfs, I see it. I'll start removing
variables now... :P

-Kees

-- 
Kees Cook
Pixel Security