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From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Jarkko Sakkinen
	<jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Cc: Herbert Xu
	<herbert-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>,
	"open list:INTEGRITY MEASUREMENT ARCHITECTURE (IMA)"
	<linux-ima-user-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
	PrasannaKumar Muralidharan
	<prasannatsmkumar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	open list <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	"moderated list:TPM DEVICE DRIVER"
	<tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
	Dmitry Kasatkin
	<dmitry.kasatkin-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	"open list:HARDWARE RANDOM NUMBER GENERATOR CORE"
	<linux-crypto-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	James Morris
	<james.l.morris-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
	Matt Mackall <mpm-VDJrAJ4Gl5ZBDgjK7y7TUQ@public.gmane.org>,
	"open list:INTEGRITY MEASUREMENT ARCHITECTURE (IMA)"
	<linux-ima-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
	David Safford <safford-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>,
	linux-integrity-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Mimi Zohar
	<zohar-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
	"open list:KEYS-TRUSTED"
	<keyrings-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"Serge E. Hallyn" <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH v2] tpm: use struct tpm_chip for tpm_chip_find_get()
Date: Wed, 25 Oct 2017 14:17:44 -0600	[thread overview]
Message-ID: <20171025201744.GB2815@obsidianresearch.com> (raw)
In-Reply-To: <20171025200746.svsraubdotjyzt2i-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

On Wed, Oct 25, 2017 at 10:07:46PM +0200, Jarkko Sakkinen wrote:

> The id has a nice feature that it is unique for one boot cycle you can
> even try to get a chip that has been deleted. It has the most stable
> properties in the long run.

It isn't unique, we can re-use ids them via idr_alloc(). We should
never use index inside the kernel.

> Address is a reusable identifier in one boot cycle.

It is invalid to pass in a chip for which the caller does not hold a
kref, so address is the safest argument.

Jason

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  parent reply	other threads:[~2017-10-25 20:17 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-25 11:55 [PATCH v2] tpm: use struct tpm_chip for tpm_chip_find_get() Jarkko Sakkinen
2017-10-25 15:10 ` PrasannaKumar Muralidharan
2017-10-25 19:34   ` Jarkko Sakkinen
2017-10-25 19:46     ` Jason Gunthorpe
2017-10-25 20:07       ` Jarkko Sakkinen
     [not found]         ` <20171025200746.svsraubdotjyzt2i-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-10-25 20:17           ` Jason Gunthorpe [this message]
2017-10-26 10:54             ` Jarkko Sakkinen
2017-10-25 15:22 ` Jason Gunthorpe

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