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From: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: "Michal Suchánek" <msuchanek-l3A5Bk7waGM@public.gmane.org>
Cc: linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [PATCH RESEND 3/3] tpm-chip: Export TPM device to user space even when startup failed
Date: Wed, 30 Aug 2017 13:15:10 +0300	[thread overview]
Message-ID: <20170830101510.rlkh2p3zecfsrhgl@linux.intel.com> (raw)
In-Reply-To: <20170829151739.315ae581-6hIufAJW0g4CVLCxKZUutA@public.gmane.org>

On Tue, Aug 29, 2017 at 03:17:39PM +0200, Michal Suchánek wrote:
> Hello,
> 
> On Tue, 29 Aug 2017 15:55:09 +0300
> Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> wrote:
> 
> > On Mon, Aug 28, 2017 at 05:15:58PM +0000,
> > Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w@public.gmane.org wrote:
> > > But is that just because nobody bothered to implement the necessary
> > > logic or for some other reason?  
> > 
> > We do not want user space to access broken hardware. It's a huge risk
> > for system stability and potentially could be used for evil purposes.
> > 
> > This is not going to mainline as it is not suitable for general
> > consumption. You must use a patched kernel if you want this.
> > 
> > /Jarkko
> > 
> 
> It has been pointed out that userspace applications that use direct IO
> access exist for the purpose. So using a kernel driver is an
> improvement over that if the interface is otherwise sane.
> 
> What do you expect is the potential for instability or evil use?

By definition the use of broken hardware can have unpredictable effects.
Use a patched kernel if you want to do it.

/Jarkko

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  parent reply	other threads:[~2017-08-30 10:15 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-24  8:37 [PATCH RESEND 0/3] Export broken TPMs to user space Alexander Steffen
     [not found] ` <20170824083714.10016-1-Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w@public.gmane.org>
2017-08-24  8:37   ` [PATCH RESEND 1/3] tpm-chip: Move idr_replace calls to appropriate places Alexander Steffen
2017-08-25 17:25     ` Jarkko Sakkinen
     [not found]       ` <20170825172546.f4bl2wh7tgbyjx2n-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-08-28 17:18         ` Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w
2017-08-24  8:37   ` [PATCH RESEND 2/3] tpm-chip: Return TPM error codes from auto_startup functions Alexander Steffen
     [not found]     ` <20170824083714.10016-3-Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w@public.gmane.org>
2017-08-25 17:06       ` Jarkko Sakkinen
     [not found]         ` <20170825170607.wfnr5y5zres2n42r-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-08-29 12:11           ` Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w
2017-08-24  8:37   ` [PATCH RESEND 3/3] tpm-chip: Export TPM device to user space even when startup failed Alexander Steffen
2017-08-25 17:20     ` Jarkko Sakkinen
     [not found]       ` <20170825172021.lw3ycxqw63ubrcm2-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-08-28 17:15         ` Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w
2017-08-29 12:55           ` Jarkko Sakkinen
2017-08-29 13:17             ` [tpmdd-devel] " Michal Suchánek
     [not found]               ` <20170829151739.315ae581-6hIufAJW0g4CVLCxKZUutA@public.gmane.org>
2017-08-29 13:53                 ` Peter Huewe
2017-08-30 10:26                   ` [tpmdd-devel] " Jarkko Sakkinen
2017-08-30 10:15                 ` Jarkko Sakkinen [this message]
2017-08-30 10:20                   ` Jarkko Sakkinen
2017-08-30 10:34                     ` Michal Suchánek
2017-08-30 11:07                       ` Jarkko Sakkinen
2017-08-31 16:18                         ` Alexander.Steffen
2017-09-02 10:20                           ` Jarkko Sakkinen
     [not found]                   ` <20170830101510.rlkh2p3zecfsrhgl-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-08-30 10:41                     ` Peter Huewe
2017-08-30 11:10                       ` [tpmdd-devel] " Jarkko Sakkinen
2017-08-31 16:26                         ` Alexander.Steffen
2017-09-02 10:24                           ` Jarkko Sakkinen

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