linux-kernel - Re: [PATCH repost] virtio: don't crash when device is buggy

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Date:	Wed, 19 Sep 2012 13:40:43 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Sjur Brændeland <sjurbren@...il.com>,
	Amit Shah <amit.shah@...hat.com>, linux-kernel@...r.kernel.org,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH repost] virtio: don't crash when device is buggy

"Michael S. Tsirkin" <mst@...hat.com> writes:

> On Mon, Sep 17, 2012 at 01:57:17PM +0930, Rusty Russell wrote:
>> "Michael S. Tsirkin" <mst@...hat.com> writes:
>> 
>> > Because of a sanity check in virtio_dev_remove, a buggy device can crash
>> > kernel.  And in case of rproc it's userspace so it's not a good idea.
>> > We are unloading a driver so how bad can it be?
>> > Be less aggressive in handling this error: if it's a driver bug,
>> > warning once should be enough.
>> >
>> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
>> >
>> > --
>> >
>> > 3.6 material?
>> 
>> I have already applied, this, but it's not for stable, since it's a
>> "theoretical bugfix".  That check has been in there forever and noone
>> AFAIK has actually struck it.
>> 
>> Cheers,
>> Rusty.
>
> Yes but can't malicious userspace trigger this with remoteproc? If yes
> it's not a question of whether anyone has struck it since people don't
> normally run malicious userspace :)

I think that malicious userspace is already priveleged, isn't it?

Cheers,
Rusty.
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