linux-kernel - Ping^2 Re: [PATCH v3 0/2] add per-device sysfs knob to enable unrestricted, unprivileged SG

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Date:	Fri, 04 Jan 2013 19:48:14 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jens Axboe <axboe@...nel.dk>,
	Ric Wheeler <rwheeler@...hat.com>, Tejun Heo <tj@...nel.org>
Subject: Ping^2 Re: [PATCH v3 0/2] add per-device sysfs knob to enable unrestricted,
 unprivileged SG_IO

Il 17/12/2012 15:27, Paolo Bonzini ha scritto:
> Il 13/11/2012 18:25, Paolo Bonzini ha scritto:
>> > Privilege restrictions for SG_IO right now apply without distinction to
>> > all devices, based on the single capability CAP_SYS_RAWIO.  This is a very
>> > broad capability, and makes it difficult to give SG_IO access to trusted
>> > clients that need access to persistent reservations, trim/discard, or
>> > vendor-specific commands.  One problem here is that CAP_SYS_RAWIO allows
>> > to escape a partition and issue commands that affect the full disk,
>> > thus making DAC almost useless.
>> > 
>> > For simplicity, this series attempts to solve one case only: you want
>> > to pass through almost everything, but still run as confined as possible.
>> > This is for example the case for virtualization, where more complex
>> > filtering can be done just as easily in userspace, in the virtual
>> > machine monitor.  (This does mean the filter can be subverted if the
>> > guest can escape the QEMU jail, but a more generic approach involving
>> > a bitmap was NACKed).
>> > 
>> > Ok for 3.8?
> Ping... Jens, I haven't seen any pull request for 3.8 from you.  Are
> these patches on your radar?  Tejun acked both of them.

Ping^2.

Paolo
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