linux-kernel - Re: [PATCH v2] ima: add the ability to query the hash of a given file.

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Message-ID: <b88cbb1fb39175611e4b31e12a47df240a46dd48.camel@chromium.org>
Date:   Wed, 15 Jan 2020 19:45:43 +0100
From:   Florent Revest <revest@...omium.org>
To:     Mimi Zohar <zohar@...ux.ibm.com>, KP Singh <kpsingh@...omium.org>
Cc:     linux-integrity@...r.kernel.org, mjg59@...gle.com,
        nramas@...ux.microsoft.com, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Florent Revest <revest@...gle.com>
Subject: Re: [PATCH v2] ima: add the ability to query the hash of a given
 file.

On Wed, 2020-01-15 at 13:36 -0500, Mimi Zohar wrote:
> On Mon, 2020-01-13 at 11:48 +0100, KP Singh wrote:
> > On 06-Jan 17:25, Florent Revest wrote:
> > > From: Florent Revest <revest@...gle.com>
> > > 
> > > This allows other parts of the kernel (perhaps a stacked LSM
> > > allowing
> > > system monitoring, eg. the proposed KRSI LSM [1]) to retrieve the
> > > hash
> > > of a given file from IMA if it's present in the iint cache.
> > > 
> > > It's true that the existence of the hash means that it's also in
> > > the
> > > audit logs or in
> > > /sys/kernel/security/ima/ascii_runtime_measurements,
> > > but it can be difficult to pull that information out for every
> > > subsequent exec.  This is especially true if a given host has
> > > been up
> > > for a long time and the file was first measured a long time ago.
> > > 
> > > This is based on Peter Moody's patch:
> > >  https://sourceforge.net/p/linux-ima/mailman/message/33036180/
> > > 
> > > [1] https://lkml.org/lkml/2019/9/10/393
> > > 
> > > Signed-off-by: Florent Revest <revest@...gle.com>
> > 
> > Thanks for adding this Florent!
> > 
> > Reviewed-by: KP Singh <kpsingh@...omium.org>
> 
> Thanks, this patch is now queued in next-integrity-testing.

Good to hear Mimi! Thank you.

I would just like to make sure that you queued the v3 of this patch
though...? (this thread is for the v2 :) ) The v3 includes a couple of
comments you asked for.