linux-kernel - Re: PING^7 (was Re: [PATCH v2 00/14] Corrections and customization of the SG

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Message-ID: <51A0B4E7.4030307@redhat.com>
Date:	Sat, 25 May 2013 14:56:07 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Tejun Heo <tj@...nel.org>
CC:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jens Axboe <axboe@...nel.dk>,
	lkml <linux-kernel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: PING^7 (was Re: [PATCH v2 00/14] Corrections and customization
 of the SG_IO command whitelist (CVE-2012-4542))

Il 25/05/2013 14:48, Tejun Heo ha scritto:
>>> * Merge the patch to give out SG_IO access along with write access, so
>>> > >   the use cases which want to give out SG_IO access can do so
>>> > >   explicitly and be fully responsible for the device.  This makes
>>> > >   sense to me.  If one wants to be allowed to issue raw commands to
>>> > >   the hardware, one takes the full responsibility.
>> > 
>> > That's not possible; it would make it impossible to do things like using
>> > a privileged helper to open the file and passing it back via SCM_RIGHTS
>> > to an unprivileged program (running as the user).  This is the ptrace
>> > attack that you mentioned.
> I have no idea what you're talking about.  I'm describing the same
> thing you implemented and posted.

Ok, I think we need a rewind.  I'll try to post what I mean next week.

Paolo
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