From: Dan Williams <dan.j.williams@intel.com>
To: Thomas Fossati <thomas.fossati@linaro.org>,
Dan Williams <dan.j.williams@intel.com>
Cc: <linux-coco@lists.linux.dev>,
Dionna Amalie Glaze <dionnaglaze@google.com>,
James Bottomley <James.Bottomley@hansenpartnership.com>,
Peter Gonda <pgonda@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Samuel Ortiz <sameo@rivosinc.com>,
Thomas Gleixner <tglx@linutronix.de>, <peterz@infradead.org>,
<linux-kernel@vger.kernel.org>, <x86@kernel.org>,
<dave.hansen@linux.intel.com>
Subject: Re: [PATCH v4 2/6] configfs-tsm: Introduce a shared ABI for attestation reports
Date: Wed, 27 Sep 2023 01:21:27 -0700 [thread overview]
Message-ID: <6513e6079a427_91c1e294e@dwillia2-xfh.jf.intel.com.notmuch> (raw)
In-Reply-To: <CA+1=6yfmLXJbZu7Gd7cp_HOAbmHwx54aPgozWKBikWwZSYTOZw@mail.gmail.com>
Thomas Fossati wrote:
> Hi Dan,
>
> > On 9/25/2023 9:17 PM, Dan Williams wrote:
> > > +++ b/include/linux/tsm.h
> > > @@ -0,0 +1,63 @@
> > > +/* SPDX-License-Identifier: GPL-2.0 */
> > > +#ifndef __TSM_H
> > > +#define __TSM_H
> > > +
> > > +#include <linux/sizes.h>
> > > +#include <linux/types.h>
> > > +#include <linux/device.h>
> > > +
> > > +#define TSM_INBLOB_MAX 64
>
> I guess @inblob is supposed to (possibly) accommodate nonces from a
> challenger, correct?
> If so, 64 bytes may not be enough for attesters that produce
> EAT-formatted reports -- see [1], and [2].
>
> [1] https://www.ietf.org/archive/id/draft-ietf-rats-eat-21.html#section-4.1-5
> [2] https://github.com/ietf-rats-wg/eat/pull/421/files
Hmm, but 64-bytes is the hard limit of the supported platform
implementations.
It can be expanded when/if those platforms expand the
size of the supported user data, or another configfs-tsm backend arrives
that needs that capability.
next prev parent reply other threads:[~2023-09-27 8:21 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-26 4:16 [PATCH v4 0/6] configfs-tsm: Attestation Report ABI Dan Williams
2023-09-26 4:17 ` [PATCH v4 1/6] virt: coco: Add a coco/Makefile and coco/Kconfig Dan Williams
2023-09-26 4:17 ` [PATCH v4 2/6] configfs-tsm: Introduce a shared ABI for attestation reports Dan Williams
2023-09-26 18:49 ` Kuppuswamy Sathyanarayanan
2023-09-26 18:59 ` Dan Williams
2023-09-27 0:43 ` Kuppuswamy Sathyanarayanan
2023-09-27 3:17 ` Dan Williams
2023-09-27 8:04 ` Thomas Fossati
2023-09-27 8:21 ` Dan Williams [this message]
2023-09-27 8:25 ` Thomas Fossati
2023-09-27 14:38 ` Peter Gonda
2023-09-27 19:05 ` Thomas Fossati
2023-09-27 8:43 ` Thomas Fossati
2023-09-27 2:10 ` Kuppuswamy Sathyanarayanan
2023-09-26 4:17 ` [PATCH v4 3/6] virt: sevguest: Prep for kernel internal {get, get_ext}_report() Dan Williams
2023-09-26 18:51 ` Kuppuswamy Sathyanarayanan
2023-09-26 4:17 ` [PATCH v4 4/6] mm/slab: Add __free() support for kvfree Dan Williams
2023-09-26 4:17 ` [PATCH v4 5/6] virt: sevguest: Add TSM_REPORTS support for SNP_{GET, GET_EXT}_REPORT Dan Williams
2023-10-04 8:22 ` Dan Carpenter
2023-09-26 4:17 ` [PATCH v4 6/6] virt: tdx-guest: Add Quote generation support using TSM_REPORTS Dan Williams
2023-09-27 16:14 ` Peter Gonda
2023-09-27 16:53 ` Dan Williams
2023-09-28 22:49 ` Dan Williams
2023-09-29 17:26 ` Peter Gonda
2023-10-03 18:37 ` Peter Gonda
2023-10-03 19:29 ` Kuppuswamy Sathyanarayanan
2023-10-03 20:06 ` Peter Gonda
2023-10-04 0:54 ` Dan Williams
2023-10-10 19:36 ` Dan Williams
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