linux-kernel - Re: [PATCH 0/2] ima: policy search speedup

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Message-ID: <CA+55aFwaFqJQXR3Z8M3byube6hODmiT-dDEH3uFPSKpTDGXHaQ@mail.gmail.com>
Date:	Tue, 11 Dec 2012 12:05:08 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	Eric Paris <eparis@...isplace.org>,
	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	LSM List <linux-security-module@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	James Morris <jmorris@...ei.org>
Subject: Re: [PATCH 0/2] ima: policy search speedup

On Tue, Dec 11, 2012 at 11:48 AM, Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
>
> Ok. To summarize, S_IMA indicates that there is a rule and that the iint
> was allocated.  To differentiate between 'haven't looked/don't know' and
> 'definitely not', we need another bit.  For this, you're suggesting
> using IS_PRIVATE()?  Hopefully, I misunderstood.

No, for that, I'm suggesting using a new bit in i_flags.

The "IS_PRIVATE()" thing is more a "if you know a-priori that you
aren't interested in pseudo-filesystems, you can already check that
bit, because it will be set for things like /proc and shmem mappings
and pipes etc".

Dmitry seemed to imply that the biggest use for the new bit was for
taking out whole pseudo-filesystems in one go. That would pretty much
be what S_PRIVATE is.

                  Linus
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