[PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

[PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

[Stefan Berger]

From: Stefan Berger <stefanb@linux.ibm.com>

Recent extensions of the TPM2 ACPI table added 3 more fields
including 12 bytes of start method specific parameters and Log Area
Minimum Length (u32) and Log Area Start Address (u64). So, we extend
the existing structure with these fields to allow non-UEFI systems
to access the TPM2's log.

The specification that has the new fields is the following:
  TCG ACPI Specification
  Family "1.2" and "2.0"
  Version 1.2, Revision 8

Adapt all existing table size calculations to use
offsetof(struct acpi_table_tpm2, start_method_specific)
[where start_method_specific is a newly added field]
rather than sizeof(struct acpi_table_tpm2) so that the addition
of the new fields does not affect current systems that may not
have them.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Cc: linux-acpi@vger.kernel.org
---
 drivers/char/tpm/tpm_crb.c | 13 ++++++++++---
 drivers/char/tpm/tpm_tis.c |  4 +++-
 include/acpi/actbl3.h      |  5 +++--
 3 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index a9dcf31eadd2..0565aa5482f9 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -669,7 +669,9 @@ static int crb_acpi_add(struct acpi_device *device)
 
 	status = acpi_get_table(ACPI_SIG_TPM2, 1,
 				(struct acpi_table_header **) &buf);
-	if (ACPI_FAILURE(status) || buf->header.length < sizeof(*buf)) {
+	if (ACPI_FAILURE(status) || buf->header.length <
+			offsetof(struct acpi_table_tpm2,
+				 start_method_specific)) {
 		dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
 		return -EINVAL;
 	}
@@ -684,14 +686,19 @@ static int crb_acpi_add(struct acpi_device *device)
 		return -ENOMEM;
 
 	if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) {
-		if (buf->header.length < (sizeof(*buf) + sizeof(*crb_smc))) {
+		if (buf->header.length <
+			(offsetof(struct acpi_table_tpm2,
+				  start_method_specific) +
+			 sizeof(*crb_smc))) {
 			dev_err(dev,
 				FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n",
 				buf->header.length,
 				ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC);
 			return -EINVAL;
 		}
-		crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, sizeof(*buf));
+		crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf,
+			   offsetof(struct acpi_table_tpm2,
+				    start_method_specific));
 		priv->smc_func_id = crb_smc->smc_func_id;
 	}
 
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index e7df342a317d..a80f36860bac 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -111,7 +111,9 @@ static int check_acpi_tpm2(struct device *dev)
 	 */
 	st =
 	    acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl);
-	if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
+	if (ACPI_FAILURE(st) || tbl->header.length <
+			offsetof(struct acpi_table_tpm2,
+				 start_method_specific)) {
 		dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
 		return -EINVAL;
 	}
diff --git a/include/acpi/actbl3.h b/include/acpi/actbl3.h
index 2bf3baf819bb..b6118c67af0c 100644
--- a/include/acpi/actbl3.h
+++ b/include/acpi/actbl3.h
@@ -411,8 +411,9 @@ struct acpi_table_tpm2 {
 	u16 reserved;
 	u64 control_address;
 	u32 start_method;
-
-	/* Platform-specific data follows */
+	u8  start_method_specific[12];
+	u32 log_area_minimum_length;		/* optional */
+	u64 log_area_start_address;		/* optional */
 };
 
 /* Values for start_method above */
-- 
2.14.5

Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

[Jarkko Sakkinen]

On Tue, Mar 31, 2020 at 05:49:49PM -0400, Stefan Berger wrote:
> From: Stefan Berger <stefanb@linux.ibm.com>
> 
> Recent extensions of the TPM2 ACPI table added 3 more fields
> including 12 bytes of start method specific parameters and Log Area
> Minimum Length (u32) and Log Area Start Address (u64). So, we extend
> the existing structure with these fields to allow non-UEFI systems
> to access the TPM2's log.
> 
> The specification that has the new fields is the following:
>   TCG ACPI Specification
>   Family "1.2" and "2.0"
>   Version 1.2, Revision 8
> 
> Adapt all existing table size calculations to use
> offsetof(struct acpi_table_tpm2, start_method_specific)
> [where start_method_specific is a newly added field]
> rather than sizeof(struct acpi_table_tpm2) so that the addition
> of the new fields does not affect current systems that may not
> have them.
> 
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> Cc: linux-acpi@vger.kernel.org

I think I'm cool with this but needs an ack from ACPI maintainer.

Rafael, given that this not an intrusive change in any possible means,
can I pick this patch and put it to my next pull request?

/Jarkko

Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

[Rafael J. Wysocki]

On Wed, Apr 1, 2020 at 10:37 AM Jarkko Sakkinen
<jarkko.sakkinen@linux.intel.com> wrote:
>
> On Tue, Mar 31, 2020 at 05:49:49PM -0400, Stefan Berger wrote:
> > From: Stefan Berger <stefanb@linux.ibm.com>
> >
> > Recent extensions of the TPM2 ACPI table added 3 more fields
> > including 12 bytes of start method specific parameters and Log Area
> > Minimum Length (u32) and Log Area Start Address (u64). So, we extend
> > the existing structure with these fields to allow non-UEFI systems
> > to access the TPM2's log.
> >
> > The specification that has the new fields is the following:
> >   TCG ACPI Specification
> >   Family "1.2" and "2.0"
> >   Version 1.2, Revision 8
> >
> > Adapt all existing table size calculations to use
> > offsetof(struct acpi_table_tpm2, start_method_specific)
> > [where start_method_specific is a newly added field]
> > rather than sizeof(struct acpi_table_tpm2) so that the addition
> > of the new fields does not affect current systems that may not
> > have them.
> >
> > Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> > Cc: linux-acpi@vger.kernel.org
>
> I think I'm cool with this but needs an ack from ACPI maintainer.
>
> Rafael, given that this not an intrusive change in any possible means,
> can I pick this patch and put it to my next pull request?

Yes, please.

Thanks!

Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

[Jarkko Sakkinen]

On Wed, Apr 01, 2020 at 11:05:36AM +0200, Rafael J. Wysocki wrote:
> On Wed, Apr 1, 2020 at 10:37 AM Jarkko Sakkinen
> <jarkko.sakkinen@linux.intel.com> wrote:
> >
> > On Tue, Mar 31, 2020 at 05:49:49PM -0400, Stefan Berger wrote:
> > > From: Stefan Berger <stefanb@linux.ibm.com>
> > >
> > > Recent extensions of the TPM2 ACPI table added 3 more fields
> > > including 12 bytes of start method specific parameters and Log Area
> > > Minimum Length (u32) and Log Area Start Address (u64). So, we extend
> > > the existing structure with these fields to allow non-UEFI systems
> > > to access the TPM2's log.
> > >
> > > The specification that has the new fields is the following:
> > >   TCG ACPI Specification
> > >   Family "1.2" and "2.0"
> > >   Version 1.2, Revision 8
> > >
> > > Adapt all existing table size calculations to use
> > > offsetof(struct acpi_table_tpm2, start_method_specific)
> > > [where start_method_specific is a newly added field]
> > > rather than sizeof(struct acpi_table_tpm2) so that the addition
> > > of the new fields does not affect current systems that may not
> > > have them.
> > >
> > > Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> > > Cc: linux-acpi@vger.kernel.org
> >
> > I think I'm cool with this but needs an ack from ACPI maintainer.
> >
> > Rafael, given that this not an intrusive change in any possible means,
> > can I pick this patch and put it to my next pull request?
> 
> Yes, please.
> 
> Thanks!

Great, thanks Rafael.

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

Do you mind if I add your ack to the commit?

/Jarkko

Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

[Stefan Berger]

On 4/2/20 3:21 PM, Jarkko Sakkinen wrote:
> On Wed, Apr 01, 2020 at 11:05:36AM +0200, Rafael J. Wysocki wrote:
>> On Wed, Apr 1, 2020 at 10:37 AM Jarkko Sakkinen
>> <jarkko.sakkinen@linux.intel.com> wrote:
>>> On Tue, Mar 31, 2020 at 05:49:49PM -0400, Stefan Berger wrote:
>>>> From: Stefan Berger <stefanb@linux.ibm.com>
>>>>
>>>> Recent extensions of the TPM2 ACPI table added 3 more fields
>>>> including 12 bytes of start method specific parameters and Log Area
>>>> Minimum Length (u32) and Log Area Start Address (u64). So, we extend
>>>> the existing structure with these fields to allow non-UEFI systems
>>>> to access the TPM2's log.
>>>>
>>>> The specification that has the new fields is the following:
>>>>    TCG ACPI Specification
>>>>    Family "1.2" and "2.0"
>>>>    Version 1.2, Revision 8
>>>>
>>>> Adapt all existing table size calculations to use
>>>> offsetof(struct acpi_table_tpm2, start_method_specific)
>>>> [where start_method_specific is a newly added field]
>>>> rather than sizeof(struct acpi_table_tpm2) so that the addition
>>>> of the new fields does not affect current systems that may not
>>>> have them.
>>>>
>>>> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
>>>> Cc: linux-acpi@vger.kernel.org
>>> I think I'm cool with this but needs an ack from ACPI maintainer.
>>>
>>> Rafael, given that this not an intrusive change in any possible means,
>>> can I pick this patch and put it to my next pull request?
>> Yes, please.
>>
>> Thanks!
> Great, thanks Rafael.
>
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
>
> Do you mind if I add your ack to the commit?


Any chance to get v4 applied?


>
> /Jarkko

Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

[Rafael J. Wysocki]

On Fri, Jun 19, 2020 at 5:14 PM Stefan Berger <stefanb@linux.ibm.com> wrote:
>
> On 4/2/20 3:21 PM, Jarkko Sakkinen wrote:
> > On Wed, Apr 01, 2020 at 11:05:36AM +0200, Rafael J. Wysocki wrote:
> >> On Wed, Apr 1, 2020 at 10:37 AM Jarkko Sakkinen
> >> <jarkko.sakkinen@linux.intel.com> wrote:
> >>> On Tue, Mar 31, 2020 at 05:49:49PM -0400, Stefan Berger wrote:
> >>>> From: Stefan Berger <stefanb@linux.ibm.com>
> >>>>
> >>>> Recent extensions of the TPM2 ACPI table added 3 more fields
> >>>> including 12 bytes of start method specific parameters and Log Area
> >>>> Minimum Length (u32) and Log Area Start Address (u64). So, we extend
> >>>> the existing structure with these fields to allow non-UEFI systems
> >>>> to access the TPM2's log.
> >>>>
> >>>> The specification that has the new fields is the following:
> >>>>    TCG ACPI Specification
> >>>>    Family "1.2" and "2.0"
> >>>>    Version 1.2, Revision 8
> >>>>
> >>>> Adapt all existing table size calculations to use
> >>>> offsetof(struct acpi_table_tpm2, start_method_specific)
> >>>> [where start_method_specific is a newly added field]
> >>>> rather than sizeof(struct acpi_table_tpm2) so that the addition
> >>>> of the new fields does not affect current systems that may not
> >>>> have them.
> >>>>
> >>>> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> >>>> Cc: linux-acpi@vger.kernel.org
> >>> I think I'm cool with this but needs an ack from ACPI maintainer.
> >>>
> >>> Rafael, given that this not an intrusive change in any possible means,
> >>> can I pick this patch and put it to my next pull request?
> >> Yes, please.
> >>
> >> Thanks!
> > Great, thanks Rafael.
> >
> > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> >
> > Do you mind if I add your ack to the commit?
>

It looks like I missed the previous message from Jarkko.

Yes, please, feel free to add my ACK to the patch, thanks!

Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

[Jarkko Sakkinen]

On Fri, Jun 19, 2020 at 05:55:19PM +0200, Rafael J. Wysocki wrote:
> On Fri, Jun 19, 2020 at 5:14 PM Stefan Berger <stefanb@linux.ibm.com> wrote:
> >
> > On 4/2/20 3:21 PM, Jarkko Sakkinen wrote:
> > > On Wed, Apr 01, 2020 at 11:05:36AM +0200, Rafael J. Wysocki wrote:
> > >> On Wed, Apr 1, 2020 at 10:37 AM Jarkko Sakkinen
> > >> <jarkko.sakkinen@linux.intel.com> wrote:
> > >>> On Tue, Mar 31, 2020 at 05:49:49PM -0400, Stefan Berger wrote:
> > >>>> From: Stefan Berger <stefanb@linux.ibm.com>
> > >>>>
> > >>>> Recent extensions of the TPM2 ACPI table added 3 more fields
> > >>>> including 12 bytes of start method specific parameters and Log Area
> > >>>> Minimum Length (u32) and Log Area Start Address (u64). So, we extend
> > >>>> the existing structure with these fields to allow non-UEFI systems
> > >>>> to access the TPM2's log.
> > >>>>
> > >>>> The specification that has the new fields is the following:
> > >>>>    TCG ACPI Specification
> > >>>>    Family "1.2" and "2.0"
> > >>>>    Version 1.2, Revision 8
> > >>>>
> > >>>> Adapt all existing table size calculations to use
> > >>>> offsetof(struct acpi_table_tpm2, start_method_specific)
> > >>>> [where start_method_specific is a newly added field]
> > >>>> rather than sizeof(struct acpi_table_tpm2) so that the addition
> > >>>> of the new fields does not affect current systems that may not
> > >>>> have them.
> > >>>>
> > >>>> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> > >>>> Cc: linux-acpi@vger.kernel.org
> > >>> I think I'm cool with this but needs an ack from ACPI maintainer.
> > >>>
> > >>> Rafael, given that this not an intrusive change in any possible means,
> > >>> can I pick this patch and put it to my next pull request?
> > >> Yes, please.
> > >>
> > >> Thanks!
> > > Great, thanks Rafael.
> > >
> > > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > >
> > > Do you mind if I add your ack to the commit?
> >
> 
> It looks like I missed the previous message from Jarkko.
> 
> Yes, please, feel free to add my ACK to the patch, thanks!

OK, this is great, thanks. I'll pick it to my tree then.

/Jarkko

Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

[Jarkko Sakkinen]

On Fri, Jun 19, 2020 at 11:14:20AM -0400, Stefan Berger wrote:
> On 4/2/20 3:21 PM, Jarkko Sakkinen wrote:
> > On Wed, Apr 01, 2020 at 11:05:36AM +0200, Rafael J. Wysocki wrote:
> > > On Wed, Apr 1, 2020 at 10:37 AM Jarkko Sakkinen
> > > <jarkko.sakkinen@linux.intel.com> wrote:
> > > > On Tue, Mar 31, 2020 at 05:49:49PM -0400, Stefan Berger wrote:
> > > > > From: Stefan Berger <stefanb@linux.ibm.com>
> > > > > 
> > > > > Recent extensions of the TPM2 ACPI table added 3 more fields
> > > > > including 12 bytes of start method specific parameters and Log Area
> > > > > Minimum Length (u32) and Log Area Start Address (u64). So, we extend
> > > > > the existing structure with these fields to allow non-UEFI systems
> > > > > to access the TPM2's log.
> > > > > 
> > > > > The specification that has the new fields is the following:
> > > > >    TCG ACPI Specification
> > > > >    Family "1.2" and "2.0"
> > > > >    Version 1.2, Revision 8
> > > > > 
> > > > > Adapt all existing table size calculations to use
> > > > > offsetof(struct acpi_table_tpm2, start_method_specific)
> > > > > [where start_method_specific is a newly added field]
> > > > > rather than sizeof(struct acpi_table_tpm2) so that the addition
> > > > > of the new fields does not affect current systems that may not
> > > > > have them.
> > > > > 
> > > > > Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> > > > > Cc: linux-acpi@vger.kernel.org
> > > > I think I'm cool with this but needs an ack from ACPI maintainer.
> > > > 
> > > > Rafael, given that this not an intrusive change in any possible means,
> > > > can I pick this patch and put it to my next pull request?
> > > Yes, please.
> > > 
> > > Thanks!
> > Great, thanks Rafael.
> > 
> > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > 
> > Do you mind if I add your ack to the commit?
> 
> 
> Any chance to get v4 applied?

You should split the actbl3.h change to a separate patch and add 'Cc:'
tag to Rafael to the commit message.

/Jarkko

Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

[Jarkko Sakkinen]

On Tue, Jun 23, 2020 at 03:56:53AM +0300, Jarkko Sakkinen wrote:
> On Fri, Jun 19, 2020 at 11:14:20AM -0400, Stefan Berger wrote:
> > On 4/2/20 3:21 PM, Jarkko Sakkinen wrote:
> > > On Wed, Apr 01, 2020 at 11:05:36AM +0200, Rafael J. Wysocki wrote:
> > > > On Wed, Apr 1, 2020 at 10:37 AM Jarkko Sakkinen
> > > > <jarkko.sakkinen@linux.intel.com> wrote:
> > > > > On Tue, Mar 31, 2020 at 05:49:49PM -0400, Stefan Berger wrote:
> > > > > > From: Stefan Berger <stefanb@linux.ibm.com>
> > > > > > 
> > > > > > Recent extensions of the TPM2 ACPI table added 3 more fields
> > > > > > including 12 bytes of start method specific parameters and Log Area
> > > > > > Minimum Length (u32) and Log Area Start Address (u64). So, we extend
> > > > > > the existing structure with these fields to allow non-UEFI systems
> > > > > > to access the TPM2's log.
> > > > > > 
> > > > > > The specification that has the new fields is the following:
> > > > > >    TCG ACPI Specification
> > > > > >    Family "1.2" and "2.0"
> > > > > >    Version 1.2, Revision 8
> > > > > > 
> > > > > > Adapt all existing table size calculations to use
> > > > > > offsetof(struct acpi_table_tpm2, start_method_specific)
> > > > > > [where start_method_specific is a newly added field]
> > > > > > rather than sizeof(struct acpi_table_tpm2) so that the addition
> > > > > > of the new fields does not affect current systems that may not
> > > > > > have them.
> > > > > > 
> > > > > > Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> > > > > > Cc: linux-acpi@vger.kernel.org
> > > > > I think I'm cool with this but needs an ack from ACPI maintainer.
> > > > > 
> > > > > Rafael, given that this not an intrusive change in any possible means,
> > > > > can I pick this patch and put it to my next pull request?
> > > > Yes, please.
> > > > 
> > > > Thanks!
> > > Great, thanks Rafael.
> > > 
> > > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > > 
> > > Do you mind if I add your ack to the commit?
> > 
> > 
> > Any chance to get v4 applied?
> 
> You should split the actbl3.h change to a separate patch and add 'Cc:'
> tag to Rafael to the commit message.

Send v5 with Rafael's ack (no need to split anymore).

/Jarkko

Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

[Stefan Berger]

On 6/22/20 8:56 PM, Jarkko Sakkinen wrote:
> On Fri, Jun 19, 2020 at 11:14:20AM -0400, Stefan Berger wrote:
>> On 4/2/20 3:21 PM, Jarkko Sakkinen wrote:
>>> On Wed, Apr 01, 2020 at 11:05:36AM +0200, Rafael J. Wysocki wrote:
>>>> On Wed, Apr 1, 2020 at 10:37 AM Jarkko Sakkinen
>>>> <jarkko.sakkinen@linux.intel.com> wrote:
>>>>> On Tue, Mar 31, 2020 at 05:49:49PM -0400, Stefan Berger wrote:
>>>>>> From: Stefan Berger <stefanb@linux.ibm.com>
>>>>>>
>>>>>> Recent extensions of the TPM2 ACPI table added 3 more fields
>>>>>> including 12 bytes of start method specific parameters and Log Area
>>>>>> Minimum Length (u32) and Log Area Start Address (u64). So, we extend
>>>>>> the existing structure with these fields to allow non-UEFI systems
>>>>>> to access the TPM2's log.
>>>>>>
>>>>>> The specification that has the new fields is the following:
>>>>>>     TCG ACPI Specification
>>>>>>     Family "1.2" and "2.0"
>>>>>>     Version 1.2, Revision 8
>>>>>>
>>>>>> Adapt all existing table size calculations to use
>>>>>> offsetof(struct acpi_table_tpm2, start_method_specific)
>>>>>> [where start_method_specific is a newly added field]
>>>>>> rather than sizeof(struct acpi_table_tpm2) so that the addition
>>>>>> of the new fields does not affect current systems that may not
>>>>>> have them.
>>>>>>
>>>>>> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
>>>>>> Cc: linux-acpi@vger.kernel.org
>>>>> I think I'm cool with this but needs an ack from ACPI maintainer.
>>>>>
>>>>> Rafael, given that this not an intrusive change in any possible means,
>>>>> can I pick this patch and put it to my next pull request?
>>>> Yes, please.
>>>>
>>>> Thanks!
>>> Great, thanks Rafael.
>>>
>>> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
>>>
>>> Do you mind if I add your ack to the commit?
>>
>> Any chance to get v4 applied?
> You should split the actbl3.h change to a separate patch and add 'Cc:'
> tag to Rafael to the commit message.

I did this in one patch because it seems like a mistake to extend the 
structure and not modify the size checks.

   Stefan

>
> /Jarkko