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Thread-Topic: [PATCH] SecurityPkg: TPM must go to Idle state on CRB command completion. 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boundary="_000_PH0PR11MB488524F85BCE2F5ED12F428E8C8D9PH0PR11MB4885namp_" --_000_PH0PR11MB488524F85BCE2F5ED12F428E8C8D9PH0PR11MB4885namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Reviewed-by: Jiewen Yao From: Gonzalez Del Cueto, Rodrigo Sent: Saturday, October 30, 2021 5:34 AM To: Yao, Jiewen ; devel@edk2.groups.io Cc: Wang, Jian J Subject: Re: [PATCH] SecurityPkg: TPM must go to Idle state on CRB command = completion. Hi Jiewen, I have tested the proposed CRB protocol fix with three different TPM config= urations I have available which support the CRB interface: Intel PTT, STMic= ro and Nuvoton. Under these CRB configurations I didn't observe any issues = arising from the proposed change aligning with the TCG CRB protocol definit= ion. I verified the BIOS flows were unaffected and completed without errors and = that the OS was still able to interact with the TPM. Regards, -Rodrigo ________________________________ From: Yao, Jiewen > Sent: Sunday, August 8, 2021 6:27 PM To: Gonzalez Del Cueto, Rodrigo >; devel@edk2.groups.io > Cc: Wang, Jian J > Subject: RE: [PATCH] SecurityPkg: TPM must go to Idle state on CRB command = completion. Would you please tell us how many TPM2 chip you have tested? I think we need consider the compatibility of exiting TPM2 chips, to make s= ure the code still work. Thank you Yao Jiewen > -----Original Message----- > From: Gonzalez Del Cueto, Rodrigo > > Sent: Saturday, July 17, 2021 5:18 AM > To: devel@edk2.groups.io > Cc: Gonzalez Del Cueto, Rodrigo >; > Wang, Jian J >; Yao, = Jiewen > > Subject: [PATCH] SecurityPkg: TPM must go to Idle state on CRB command > completion. > > To follow the TCG CRB protocol specification, on every CRB TPM command > completion the TPM should return to Idle state, regardless of the > CRB Idle Bypass capability reported by the TPM device. > > See: TCG PC Client Device Driver Design Principles for TPM 2.0, > Version 1.0, Rev 0.27 > > Signed-off-by: Rodrigo Gonzalez del Cueto > > > Cc: Jian J Wang > > Cc: Jiewen Yao > > --- > SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c | 12 +----------- > 1 file changed, 1 insertion(+), 11 deletions(-) > > diff --git a/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c > b/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c > index f1f8091683..34e3874a5b 100644 > --- a/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c > +++ b/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c > @@ -310,7 +310,7 @@ PtpCrbTpmCommand ( > // Command completed, but buffer is not enough > // > Status =3D EFI_BUFFER_TOO_SMALL; > - goto GoReady_Exit; > + goto GoIdle_Exit; > } > *SizeOut =3D TpmOutSize; > // > @@ -328,16 +328,6 @@ PtpCrbTpmCommand ( > DEBUG ((EFI_D_VERBOSE, "\n")); > ); > > -GoReady_Exit: > - // > - // Goto Ready State if command is completed successfully and TPM suppo= rt > IdleBypass > - // If not supported. flow down to GoIdle > - // > - if (GetCachedIdleByPass () =3D=3D 1) { > - MmioWrite32((UINTN)&CrbReg->CrbControlRequest, > PTP_CRB_CONTROL_AREA_REQUEST_COMMAND_READY); > - return Status; > - } > - > // > // Do not wait for state transition for TIMEOUT_C > // This function will try to wait 2 TIMEOUT_C at the beginning in next= call. > -- > 2.31.1.windows.1 --_000_PH0PR11MB488524F85BCE2F5ED12F428E8C8D9PH0PR11MB4885namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>=

 

From: Gonzalez Del Cueto, Rodrigo <rodrigo= .gonzalez.del.cueto@intel.com>
Sent: Saturday, October 30, 2021 5:34 AM
To: Yao, Jiewen <jiewen.yao@intel.com>; devel@edk2.groups.io Cc: Wang, Jian J <jian.j.wang@intel.com>
Subject: Re: [PATCH] SecurityPkg: TPM must go to Idle state on CRB c= ommand completion.

 

Hi Jiewen,

 

I have tested the proposed CRB protocol fix with three = different TPM configurations I have available which support the CRB interfa= ce: Intel PTT, STMicro and Nuvoton. Under these CRB configurations I didn't observe any issues arising from the prop= osed change aligning with the TCG CRB protocol definition.

 

I verified the BIOS flows were unaffected and completed= without errors and that the OS was still able to interact with the TPM.

 

Regards,

-Rodrigo

From: Yao, Jiewen <jiewen.yao@intel.com>
Sent: Sunday, August 8, 2021 6:27 PM
To: Gonzalez Del Cueto, Rodrigo <rodrigo.gonzalez.del.cueto@intel.com>; devel@edk2.groups.io <devel@edk2.groups.io>
Cc: Wang, Jian J <jian.j= .wang@intel.com>
Subject: RE: [PATCH] SecurityPkg: TPM must go to Idle state on CRB c= ommand completion.

 

Would you please tell= us how many TPM2 chip you have tested?

I think we need consider the compatibility of exiting TPM2 chips, to make s= ure the code still work.


Thank you
Yao Jiewen

> -----Original Message-----
> From: Gonzalez Del Cueto, Rodrigo <rodrigo.gonzalez.del.cueto@intel.com>
> Sent: Saturday, July 17, 2021 5:18 AM
> To: devel@edk2.groups.io > Cc: Gonzalez Del Cueto, Rodrigo <rodrigo.gonzalez.del.cueto@intel.com>;
> Wang, Jian J <jian.j.wang@= intel.com>; Yao, Jiewen <= jiewen.yao@intel.com>
> Subject: [PATCH] SecurityPkg: TPM must go to Idle state on CRB command=
> completion.
>
> To follow the TCG CRB protocol specification, on every CRB TPM command=
> completion the TPM should return to Idle state, regardless of the
> CRB Idle Bypass capability reported by the TPM device.
>
> See: TCG PC Client Device Driver Design Principles for TPM 2.0,
> Version 1.0, Rev 0.27
>
> Signed-off-by: Rodrigo Gonzalez del Cueto
> <rodrigo.go= nzalez.del.cueto@intel.com>
> Cc: Jian J Wang <jian.j.wa= ng@intel.com>
> Cc: Jiewen Yao <jiewen.yao@= intel.com>
> ---
>  SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c | 12 +----------= -
>  1 file changed, 1 insertion(+), 11 deletions(-)
>
> diff --git a/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c
> b/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c
> index f1f8091683..34e3874a5b 100644
> --- a/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c
> +++ b/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c
> @@ -310,7 +310,7 @@ PtpCrbTpmCommand (
>      // Command completed, but buffer is not = enough
>      //
>      Status =3D EFI_BUFFER_TOO_SMALL;
> -    goto GoReady_Exit;
> +    goto GoIdle_Exit;
>    }
>    *SizeOut =3D TpmOutSize;
>    //
> @@ -328,16 +328,6 @@ PtpCrbTpmCommand (
>      DEBUG ((EFI_D_VERBOSE, "\n"));=
>    );
>
> -GoReady_Exit:
> -  //
> -  // Goto Ready State if command is completed successfully and T= PM support
> IdleBypass
> -  // If not supported. flow down to GoIdle
> -  //
> -  if (GetCachedIdleByPass () =3D=3D 1) {
> -    MmioWrite32((UINTN)&CrbReg->CrbControlReque= st,
> PTP_CRB_CONTROL_AREA_REQUEST_COMMAND_READY);
> -    return Status;
> -  }
> -
>    //
>    // Do not wait for state transition for TIMEOUT_C >    // This function will try to wait 2 TIMEOUT_C at the= beginning in next call.
> --
> 2.31.1.windows.1

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