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From: Jason Gunthorpe <jgg@ziepe.ca>
To: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>,
	Jiandi An <anjiandi@codeaurora.org>,
	dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com,
	linux-integrity@vger.kernel.org,
	linux-ima-devel@lists.sourceforge.net,
	linux-ima-user@lists.sourceforge.net,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	David Safford <david.safford@ge.com>
Subject: Re: [PATCH] security: Fix IMA Kconfig for dependencies on ARM64
Date: Mon, 12 Mar 2018 15:59:57 -0600	[thread overview]
Message-ID: <20180312215957.GI24717@ziepe.ca> (raw)
In-Reply-To: <1520891598.3547.190.camel@linux.vnet.ibm.com>

On Mon, Mar 12, 2018 at 05:53:18PM -0400, Mimi Zohar wrote:

> Using Kconfig to force the TPM to be builtin is not required, but
> helpful.  Users interested in IMA-measurement could configure the TPM
> as builtin themselves.  Without the TPM builtin, IMA goes into TPM-
> bypass mode.

This issues, broadly speaking, we have lots of TPM drivers, selecting
only some to actually support IMA shows we have some kind of problem
here.

eg a distro on ARM should not have some TPM hardware work with IMA and
some fail just because of this kconfig.

IMHO if we want to do this, then IMA should completely disable modular
TPM drivers across the board.

Or, IMA folks need to figure out how to safely load TPM modules under
their constraints.

But this current kconfig approach is pretty weird..

Jason

WARNING: multiple messages have this Message-ID (diff)
From: jgg@ziepe.ca (Jason Gunthorpe)
To: linux-security-module@vger.kernel.org
Subject: [PATCH] security: Fix IMA Kconfig for dependencies on ARM64
Date: Mon, 12 Mar 2018 15:59:57 -0600	[thread overview]
Message-ID: <20180312215957.GI24717@ziepe.ca> (raw)
In-Reply-To: <1520891598.3547.190.camel@linux.vnet.ibm.com>

On Mon, Mar 12, 2018 at 05:53:18PM -0400, Mimi Zohar wrote:

> Using Kconfig to force the TPM to be builtin is not required, but
> helpful. ?Users interested in IMA-measurement could configure the TPM
> as builtin themselves. ?Without the TPM builtin, IMA goes into TPM-
> bypass mode.

This issues, broadly speaking, we have lots of TPM drivers, selecting
only some to actually support IMA shows we have some kind of problem
here.

eg a distro on ARM should not have some TPM hardware work with IMA and
some fail just because of this kconfig.

IMHO if we want to do this, then IMA should completely disable modular
TPM drivers across the board.

Or, IMA folks need to figure out how to safely load TPM modules under
their constraints.

But this current kconfig approach is pretty weird..

Jason
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WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgg@ziepe.ca>
To: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>,
	Jiandi An <anjiandi@codeaurora.org>,
	dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com,
	linux-integrity@vger.kernel.org,
	linux-ima-devel@lists.sourceforge.net,
	linux-ima-user@lists.sourceforge.net,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	David Safford <david.safford@ge.com>
Subject: Re: [PATCH] security: Fix IMA Kconfig for dependencies on ARM64
Date: Mon, 12 Mar 2018 15:59:57 -0600	[thread overview]
Message-ID: <20180312215957.GI24717@ziepe.ca> (raw)
In-Reply-To: <1520891598.3547.190.camel@linux.vnet.ibm.com>

On Mon, Mar 12, 2018 at 05:53:18PM -0400, Mimi Zohar wrote:

> Using Kconfig to force the TPM to be builtin is not required, but
> helpful.  Users interested in IMA-measurement could configure the TPM
> as builtin themselves.  Without the TPM builtin, IMA goes into TPM-
> bypass mode.

This issues, broadly speaking, we have lots of TPM drivers, selecting
only some to actually support IMA shows we have some kind of problem
here.

eg a distro on ARM should not have some TPM hardware work with IMA and
some fail just because of this kconfig.

IMHO if we want to do this, then IMA should completely disable modular
TPM drivers across the board.

Or, IMA folks need to figure out how to safely load TPM modules under
their constraints.

But this current kconfig approach is pretty weird..

Jason

  reply	other threads:[~2018-03-12 22:00 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-07  5:26 [PATCH] security: Fix IMA Kconfig for dependencies on ARM64 Jiandi An
2018-03-07  5:26 ` Jiandi An
2018-03-07 18:51 ` Jason Gunthorpe
2018-03-07 18:51   ` Jason Gunthorpe
2018-03-07 18:55   ` Mimi Zohar
2018-03-07 18:55     ` Mimi Zohar
2018-03-07 18:55     ` Mimi Zohar
2018-03-07 19:08     ` James Bottomley
2018-03-07 19:08       ` James Bottomley
2018-03-07 19:08       ` James Bottomley
2018-03-07 19:21       ` Mimi Zohar
2018-03-07 19:21         ` Mimi Zohar
2018-03-07 19:21         ` Mimi Zohar
2018-03-07 19:41         ` James Bottomley
2018-03-07 19:41           ` James Bottomley
2018-03-07 19:41           ` James Bottomley
2018-03-07 21:12           ` Jiandi An
2018-03-07 21:12             ` Jiandi An
2018-03-07 21:12             ` Jiandi An
2018-03-07 21:16             ` James Bottomley
2018-03-07 21:16               ` James Bottomley
2018-03-07 21:16               ` James Bottomley
2018-03-07 22:19           ` Mimi Zohar
2018-03-07 22:19             ` Mimi Zohar
2018-03-07 22:19             ` Mimi Zohar
2018-03-08 18:42             ` Jiandi An
2018-03-08 18:42               ` Jiandi An
2018-03-08 18:42               ` Jiandi An
2018-03-08 20:06               ` Mimi Zohar
2018-03-08 20:06                 ` Mimi Zohar
2018-03-08 20:06                 ` Mimi Zohar
2018-03-09 17:11               ` James Bottomley
2018-03-09 17:11                 ` James Bottomley
2018-03-09 17:11                 ` James Bottomley
2018-03-12 21:53                 ` Mimi Zohar
2018-03-12 21:53                   ` Mimi Zohar
2018-03-12 21:53                   ` Mimi Zohar
2018-03-12 21:59                   ` Jason Gunthorpe [this message]
2018-03-12 21:59                     ` Jason Gunthorpe
2018-03-12 21:59                     ` Jason Gunthorpe
2018-03-12 22:58                     ` Mimi Zohar
2018-03-12 22:58                       ` Mimi Zohar
2018-03-12 22:58                       ` Mimi Zohar
2018-03-12 23:05                       ` Jason Gunthorpe
2018-03-12 23:05                         ` Jason Gunthorpe
2018-03-12 23:05                         ` Jason Gunthorpe
2018-03-12 23:19                         ` Mimi Zohar
2018-03-12 23:19                           ` Mimi Zohar
2018-03-12 23:19                           ` Mimi Zohar
2018-03-12 22:30                   ` James Bottomley
2018-03-12 22:30                     ` James Bottomley
2018-03-12 22:30                     ` James Bottomley
2018-03-12 23:30                     ` Mimi Zohar
2018-03-12 23:30                       ` Mimi Zohar
2018-03-12 23:30                       ` Mimi Zohar
2018-03-13  0:06                       ` James Bottomley
2018-03-13  0:06                         ` James Bottomley
2018-03-13  0:06                         ` James Bottomley
2018-03-13 12:57                         ` Safford, David (GE Global Research, US)
2018-03-13 12:57                           ` Safford, David (GE Global Research, US)
2018-03-13 12:57                           ` Safford, David (GE Global Research, US)
2018-03-14 14:41                           ` James Bottomley
2018-03-14 14:41                             ` James Bottomley
2018-03-14 14:41                             ` James Bottomley
2018-03-14 17:08                             ` Mimi Zohar
2018-03-14 17:08                               ` Mimi Zohar
2018-03-14 17:08                               ` Mimi Zohar
2018-03-14 17:25                               ` James Bottomley
2018-03-14 17:25                                 ` James Bottomley
2018-03-14 17:25                                 ` James Bottomley
2018-03-15 16:19                                 ` Mimi Zohar
2018-03-15 16:19                                   ` Mimi Zohar
2018-03-15 16:19                                   ` Mimi Zohar
2018-03-15 17:08                                   ` James Bottomley
2018-03-15 17:08                                     ` James Bottomley
2018-03-15 17:08                                     ` James Bottomley
2018-03-15 17:14                                     ` Mimi Zohar
2018-03-15 17:14                                       ` Mimi Zohar
2018-03-15 17:14                                       ` Mimi Zohar
2018-03-15 17:29                                       ` James Bottomley
2018-03-15 17:29                                         ` James Bottomley
2018-03-15 17:29                                         ` James Bottomley
2018-03-16 16:51                                         ` Mimi Zohar
2018-03-16 16:51                                           ` Mimi Zohar
2018-03-16 16:51                                           ` Mimi Zohar
2018-03-11 22:06 ` Mimi Zohar
2018-03-11 22:06   ` Mimi Zohar

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