linux-kernel - Re: [RFC PATCH 1/2] Fix 1 untangling ima mess, part 2 with counters

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Message-ID: <20100125213042.GZ19799@ZenIV.linux.org.uk>
Date:	Mon, 25 Jan 2010 21:30:42 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, Eric Paris <eparis@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	"Serge E. Hallyn" <serue@...ux.vnet.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: Re: [RFC PATCH 1/2] Fix 1 untangling ima mess, part 2 with counters

On Mon, Jan 25, 2010 at 02:24:37PM -0500, Mimi Zohar wrote:

> The IMA counters are updated in alloc_file() and __dentry_open().
> __dentry_open() is called from a couple of places:
> lookup_instantiate_filp(), nameidata_to_filp() and dentry_open.  Of
> these calls, files are only being measured in the nameidata_to_filp()
> path.  So yes, the current ima_path_check() needs to be moved to after
> the dentry_open() in nfsd_open(), and also added after each of the other
> dentry_open() and lookup_instantiate_filp() calls.  Otherwise the
> counters will be correct, but the files will not be measured.

Wrong.  lookup_instantiate_filp() is followed by do_filp_open() ones.
So no, we don't need to add there.  As for other dentry_open(), I'm
not at all convinced that we *want* ima_path_check() done for all
of those; it should be decided on per-call basis and it's not a trivial
decision.

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