linux-kernel - Re: IMA: kernel reading files opened with O

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Message-ID: <20140711201054.GB18033@amd.pavel.ucw.cz>
Date:	Fri, 11 Jul 2014 22:10:54 +0200
From:	Pavel Machek <pavel@....cz>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Jeff Moyer <jmoyer@...hat.com>,
	Dmitry Kasatkin <d.kasatkin@...sung.com>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, viro@...IV.linux.org.uk,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
Subject: Re: IMA: kernel reading files opened with O_DIRECT

On Wed 2014-07-02 11:40:50, Christoph Hellwig wrote:
> On Wed, Jul 02, 2014 at 11:55:41AM -0400, Jeff Moyer wrote:
> > It's acceptable.
> 
> It's not because it will then also affect other reads going on at the
> same time.
> 
> The whole concept of ima is just broken, and if you want to do these
> sort of verification they need to happen inside the filesystem and not
> above it.

...and doing it at filesystem layer would also permit verification of
per-block (64KB? 1MB?) hashes. Reading entire iso image when I run
"file foo.iso" is anti-social..
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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