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

From: Mimi Zohar <zohar@linux.ibm.com>
To: KP Singh <kpsingh@chromium.org>, Florent Revest <revest@chromium.org>
Cc: linux-integrity@vger.kernel.org, mjg59@google.com,
	nramas@linux.microsoft.com, linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	Florent Revest <revest@google.com>
Subject: Re: [PATCH v2] ima: add the ability to query the hash of a given file.
Date: Wed, 15 Jan 2020 13:36:07 -0500	[thread overview]
Message-ID: <1579113367.5032.19.camel@linux.ibm.com> (raw)
In-Reply-To: <20200113104830.GA28588@google.com>

On Mon, 2020-01-13 at 11:48 +0100, KP Singh wrote:
> On 06-Jan 17:25, Florent Revest wrote:
> > From: Florent Revest <revest@google.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@google.com>
> 
> Thanks for adding this Florent!
> 
> Reviewed-by: KP Singh <kpsingh@chromium.org>

Thanks, this patch is now queued in next-integrity-testing.

Mimi