linux-kernel - Re: [PATCH] IMA: Turn IMA_MEASURE_ASYMMETRIC

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Date:   Tue, 21 Jan 2020 10:00:51 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     James Bottomley <James.Bottomley@...senPartnership.com>,
        zohar@...ux.ibm.com, linux-integrity@...r.kernel.org
Cc:     sashal@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IMA: Turn IMA_MEASURE_ASYMMETRIC_KEYS off by default

On 1/21/20 9:34 AM, James Bottomley wrote:

> What exactly do you expect distributions to do with this?  I can tell
> you that most of them will take the default option, so this gets set to
> N and you may as well not have got the patches upstream because you
> won't be able to use them in any distro with this setting.

I agree - distros that are not sure or don't care about key measurement 
are anyway not going to choose this option. Only those that really care 
will opt in.

My goal is to not burden the vast majority of the users with this 
additional overhead if they don't need it - particularly, small systems 
such as embedded devices, etc.

> 
> Well, no they can't ... it's rather rare nowadays for people to build
> their own kernels.  The vast majority of Linux consumers take what the
> distros give them.  Think carefully before you decide a config option
> is the solution to this problem.
> 
> James
> 
If you have suggestions for how I can handle it in a different way 
(other than config option), I'll be happy to try it out.

thanks,
  -lakshmi