From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Stefan Berger <stefanb@linux.vnet.ibm.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
linux-integrity@vger.kernel.org,
David Howells <dhowells@redhat.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
"open list:INTEGRITY MEASUREMENT ARCHITECTURE IMA"
<linux-ima-user@lists.sourceforge.net>,
Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
open list <linux-kernel@vger.kernel.org>,
linux-security-module@vger.kernel.org,
"moderated list:TPM DEVICE DRIVER"
<tpmdd-devel@lists.sourceforge.net>,
"open list:KEYS-TRUSTED" <keyrings@vger.kernel.org>,
"open list:HARDWARE RANDOM NUMBER GENERATOR CORE"
<linux-crypto@vger.kernel.org>,
James Morris <james.l.morris@oracle.com>,
Matt Mackall <mpm@selenic.com>,
"open list:INTEGRITY MEASUREMENT ARCHITECTURE IMA"
<linux-ima-devel@lists.sourceforge.net>
Subject: Re: [tpmdd-devel] [PATCH] tpm: remove chip_num parameter from in-kernel API
Date: Mon, 23 Oct 2017 10:31:39 -0600 [thread overview]
Message-ID: <20171023163139.GA17394@obsidianresearch.com> (raw)
In-Reply-To: <cbcb78c6-fa36-32d3-891e-96544875d97c@linux.vnet.ibm.com>
On Mon, Oct 23, 2017 at 10:07:31AM -0400, Stefan Berger wrote:
> >-int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
> >+int tpm_pcr_extend(int pcr_idx, const u8 *hash)
> > {
>
>
> I think every kernel internal TPM driver API should be called with the
> tpm_chip as a parameter. This is in foresight of namespacing of IMA where we
> want to provide the flexibility of passing a dedicated vTPM to each
> namespace and IMA would use the chip as a parameter to all of these
> functions to talk to the right tpm_vtpm_proxy instance. From that
> perspective this patch goes into the wrong direction.
Yes, we should ultimately try and get to there.. Someday the
tpm_chip_find_get() will need to become namespace aware.
But this patch is along the right path, eliminating the chip_num is
the right thing to do..
> >- tpm2 = tpm_is_tpm2(TPM_ANY_NUM);
> >+ tpm2 = tpm_is_tpm2();
> > if (tpm2 < 0)
> > return tpm2;
> >
> >@@ -1008,7 +1007,7 @@ static int trusted_instantiate(struct key *key,
> > switch (key_cmd) {
> > case Opt_load:
> > if (tpm2)
> >- ret = tpm_unseal_trusted(TPM_ANY_NUM, payload, options);
> >+ ret = tpm_unseal_trusted(payload, options);
Sequences like this are sketchy.
It should be
struct tpm_chip *tpm;
tpm = tpm_chip_find_get()
tpm2 = tpm_is_tpm2(tpm);
[..]
if (tpm2)
ret = tpm_unseal_trusted(tpm, payload, options);
[..]
tpm_put_chip(tpm);
As hot plug could alter the 'tpm' between the two tpm calls.
Jason
next prev parent reply other threads:[~2017-10-23 16:31 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-23 12:38 [PATCH] tpm: remove chip_num parameter from in-kernel API Jarkko Sakkinen
2017-10-23 14:07 ` [tpmdd-devel] " Stefan Berger
2017-10-23 16:31 ` Jason Gunthorpe [this message]
2017-10-24 15:44 ` Jarkko Sakkinen
[not found] ` <20171024154440.3jeupmus43jcgbbz-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-10-24 15:51 ` PrasannaKumar Muralidharan
2017-10-24 15:55 ` [tpmdd-devel] " Jason Gunthorpe
2017-10-24 16:07 ` PrasannaKumar Muralidharan
2017-10-24 16:11 ` Jason Gunthorpe
2017-10-24 16:14 ` PrasannaKumar Muralidharan
2017-10-24 17:46 ` Jason Gunthorpe
2017-10-24 17:56 ` PrasannaKumar Muralidharan
2017-10-24 17:02 ` Dmitry Torokhov
2017-10-24 17:37 ` Jason Gunthorpe
2017-10-24 17:44 ` PrasannaKumar Muralidharan
[not found] ` <20171024173757.GA1806-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-10-24 18:04 ` Dmitry Torokhov
2017-10-24 18:15 ` [tpmdd-devel] " Jarkko Sakkinen
[not found] ` <20171024181512.iaxtzgxexhki7aqr-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-10-24 18:40 ` Peter Huewe
2017-10-24 16:23 ` [tpmdd-devel] " Jarkko Sakkinen
2017-10-24 16:35 ` PrasannaKumar Muralidharan
[not found] ` <CANc+2y4vtr+kbhC_7Rv=rHA2LgEVBHLFEu+DYYK1UmpU63PCgQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-24 18:22 ` Jarkko Sakkinen
[not found] ` <20171024182235.d7b3oajc5zcjs57v-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-10-25 14:51 ` PrasannaKumar Muralidharan
2017-10-25 19:11 ` [tpmdd-devel] " Jarkko Sakkinen
2017-10-26 16:23 ` PrasannaKumar Muralidharan
2017-10-24 14:04 ` Jarkko Sakkinen
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