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

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Date:	Sat, 25 May 2013 01:27:44 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Tejun Heo <tj@...nel.org>, Paolo Bonzini <pbonzini@...hat.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))

On Fri, May 24, 2013 at 09:35:02PM -0700, James Bottomley wrote:
> I'll go along with this.  I'm also wondering what the problem would be
> if we just allowed all commands on either CAP_SYS_RAWIO or opening the
> device for write, so we just defer to the filesystem permissions and
> restricted read only opens to the basic all device opcodes.

I've been out of this area for a bit, but the problem used to be that
you could send destructive commands to a partition.  The right fix
for that would be to not allow SG_IO on partitions at all, just
wondering if anything would be broken by this.

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