From: Tejun Heo <tj@kernel.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-kernel@vger.kernel.org, pmatouse@redhat.com,
"James E.J. Bottomley" <JBottomley@parallels.com>,
linux-scsi@kernel.org, Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH 06/13] sg_io: whitelist a few more commands for multimedia devices
Date: Fri, 25 Jan 2013 15:47:14 -0800 [thread overview]
Message-ID: <20130125234714.GR3081@htj.dyndns.org> (raw)
In-Reply-To: <51031614.8000609@redhat.com>
Hello, Paolo.
On Sat, Jan 26, 2013 at 12:32:36AM +0100, Paolo Bonzini wrote:
> If I make a whitelist with all the commands that Linux sends, I'll have
> many new commands in the whitelist and no old commands. The new
> commands didn't exist when old drives were sold, so they are "dangerous"
> in your opinion. At that point I might as well keep the whitelist
> empty, no?
Let's not go to extremes. It's not about theoretic correctness. It's
about how to appraoch a possibly messy practical problem. To me, it
seems natural to be conservative on this and add what's being acitvely
used, which as a bonus will also give us at least some chance of
evaluating what we have and why later on if it ever needs to be
changed.
I'm just not comfortable with adding a bunch of commands by simply
scanning the specs. Let's at least have some backing data and
justification for exposing new ones. I really don't think that's too
much to ask. Start with minimal set. Grow it as needed. We can
always grow but the other direction is much harder.
Thanks.
--
tejun
next prev parent reply other threads:[~2013-01-25 23:47 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-24 15:00 [PATCH 00/13] Corrections and customization of the SG_IO command whitelist (CVE-2012-4542) Paolo Bonzini
2013-01-24 15:00 ` [PATCH 01/13] sg_io: pass request_queue to blk_verify_command Paolo Bonzini
2013-01-24 22:34 ` Tejun Heo
2013-01-24 15:00 ` [PATCH 02/13] sg_io: reorganize list of allowed commands Paolo Bonzini
2013-01-24 22:42 ` Tejun Heo
2013-01-24 22:49 ` Tejun Heo
2013-01-24 22:58 ` Tejun Heo
2013-01-25 10:01 ` Paolo Bonzini
2013-01-25 17:13 ` Tejun Heo
2013-01-25 17:26 ` Paolo Bonzini
2013-01-24 15:00 ` [PATCH 03/13] sg_io: use different default filters for each device class Paolo Bonzini
2013-01-24 15:00 ` [PATCH 04/13] sg_io: resolve conflicts between commands assigned to multiple classes (CVE-2012-4542) Paolo Bonzini
2013-01-24 15:00 ` [PATCH 05/13] sg_io: whitelist a few more commands for rare & obsolete device types Paolo Bonzini
2013-01-24 15:00 ` [PATCH 06/13] sg_io: whitelist a few more commands for multimedia devices Paolo Bonzini
2013-01-24 22:55 ` Tejun Heo
2013-01-25 9:26 ` Paolo Bonzini
2013-01-25 17:04 ` Tejun Heo
2013-01-25 17:16 ` Paolo Bonzini
2013-01-25 17:28 ` Tejun Heo
2013-01-25 17:57 ` Paolo Bonzini
2013-01-25 18:13 ` Tejun Heo
2013-01-25 18:47 ` Paolo Bonzini
2013-01-25 19:01 ` Tejun Heo
2013-01-25 22:32 ` Paolo Bonzini
2013-01-25 22:41 ` Tejun Heo
2013-01-25 23:32 ` Paolo Bonzini
2013-01-25 23:47 ` Tejun Heo [this message]
2013-01-26 10:18 ` Paolo Bonzini
2013-01-24 15:00 ` [PATCH 07/13] sg_io: whitelist a few more commands for media changers Paolo Bonzini
2013-01-24 15:00 ` [PATCH 08/13] sg_io: whitelist a few more commands for tapes Paolo Bonzini
2013-01-24 15:00 ` [PATCH 09/13] sg_io: whitelist a few more commands for disks Paolo Bonzini
2013-01-24 15:00 ` [PATCH 10/13] sg_io: whitelist a few obsolete commands Paolo Bonzini
2013-01-24 15:00 ` [PATCH 11/13] sg_io: add list of commands that were in the consulted list but are disabled Paolo Bonzini
2013-01-24 15:00 ` [PATCH 12/13] sg_io: remove remnants of sysfs SG_IO filters Paolo Bonzini
2013-01-24 15:00 ` [PATCH 13/13] sg_io: introduce unpriv_sgio queue flag Paolo Bonzini
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