linux-kernel - Re: usercopy whitelist woe in scsi_sense

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Message-ID: <dee9721a530576e667881d86bbec351b@natalenko.name>
Date:   Thu, 05 Apr 2018 16:32:45 +0200
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     Kees Cook <keescook@...omium.org>
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>,
        keescook@...gle.com
Subject: Re: usercopy whitelist woe in scsi_sense_cache

Hi.

05.04.2018 16:21, Kees Cook wrote:
> I had a VM running over night with:
> 
> [1]   Running                 while :; do
>     smartctl -a /dev/sda > /dev/null;
> done &
> [2]-  Running                 while :; do
>     ls --color=auto -lR / > /dev/null 2> /dev/null;
> done &
> [3]+  Running                 while :; do
>     sleep $(( $RANDOM % 100 )); sync; echo 3 > 
> /proc/sys/vm/drop_caches;
> done &
> 
> and I haven't seen the issue. :(
> 
> FWIW, I'm using the ahci qemu driver:
> 
> -drive file=disk-image.raw,if=none,id=drive0,format=raw \
> -device ahci,id=bus0 \
> -device ide-drive,bus=bus0.0,drive=drive0
> 
> Does this match your qemu instance?

Well, not really. I just pass 2 raw disks as "-hda sda.img -hdb sda.img" 
(it is a playground VM for me with RAID10, LVM and LUKS inside, but I 
hope this doesn't matter). Does passing "-hda" differ from your 
approach?

Regards,
   Oleksandr