* [PATCH v2] add longer timeout for verify signature command
@ 2021-05-19 14:00 amirmizi6
2021-05-19 14:00 ` [PATCH v2] tpm2: " amirmizi6
0 siblings, 1 reply; 3+ messages in thread
From: amirmizi6 @ 2021-05-19 14:00 UTC (permalink / raw)
To: Eyal.Cohen, jarkko, peterhuewe, jgg
Cc: linux-kernel, linux-integrity, Dan.Morav, oren.tanami,
shmulik.hager, amir.mizinski, Amir Mizinski
From: Amir Mizinski <amirmizi6@gmail.com>
while testing TPM2_CC_VERIFY_SIGNATURE with usage of RSA 3070-bit keys i
encountered a timeout error. it seems current values do not support this case
as described in ptp 1.05 6.5.1.3:
https://trustedcomputinggroup.org/wp-content/uploads/PC_Client_Specific-Platform_TPM_Profile_for-PTP_2p0-v1p05p_r14_pub.pdf
The patch was tested on Raspberry-Pie 3, using Nuvoton NPCT75X TPM.
Changes since version 1:
-"tpm2: add longer timout for verify signature command"
- Fixed and extended commit description.
Addressed comments from:
- Jarkko Sakkinen: https://lore.kernel.org/patchwork/patch/1424664/
Amir Mizinski (1):
tpm2: add longer timeout for verify signature command
drivers/char/tpm/tpm2-cmd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--
2.7.4
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH v2] tpm2: add longer timeout for verify signature command
2021-05-19 14:00 [PATCH v2] add longer timeout for verify signature command amirmizi6
@ 2021-05-19 14:00 ` amirmizi6
2021-05-20 16:39 ` Jarkko Sakkinen
0 siblings, 1 reply; 3+ messages in thread
From: amirmizi6 @ 2021-05-19 14:00 UTC (permalink / raw)
To: Eyal.Cohen, jarkko, peterhuewe, jgg
Cc: linux-kernel, linux-integrity, Dan.Morav, oren.tanami,
shmulik.hager, amir.mizinski, Amir Mizinski
From: Amir Mizinski <amirmizi6@gmail.com>
While running a TPM2_CC_VERIFY_SIGNATURE(0x177) operation with RSA 3070-bit
keys the TPM driver fails with the following error:
"kernel: [ 2416.187522] tpm tpm0: Operation Timed out"
Since a) the TPM PC Client specification does not specify a number for
verify signature operation timeout, and b) the duration of
TPM2_CC_VERIFY_SIGNATURE with RSA 3070-bit keys exceeds the current timeout
of TPM_LONG (2 seconds), it is preferable to pick the longest timeout
possible.
Therefore, set the duration for TPM2_CC_VERIFY_SIGNATUE to TPM_LONG_LONG
(5 minutes).
Signed-off-by: Amir Mizinski <amirmizi6@gmail.com>
---
drivers/char/tpm/tpm2-cmd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 7603295..e71154b 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -87,7 +87,7 @@ static u8 tpm2_ordinal_duration_index(u32 ordinal)
return TPM_MEDIUM;
case TPM2_CC_VERIFY_SIGNATURE: /* 177 */
- return TPM_LONG;
+ return TPM_LONG_LONG;
case TPM2_CC_PCR_EXTEND: /* 182 */
return TPM_MEDIUM;
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] tpm2: add longer timeout for verify signature command
2021-05-19 14:00 ` [PATCH v2] tpm2: " amirmizi6
@ 2021-05-20 16:39 ` Jarkko Sakkinen
0 siblings, 0 replies; 3+ messages in thread
From: Jarkko Sakkinen @ 2021-05-20 16:39 UTC (permalink / raw)
To: amirmizi6
Cc: Eyal.Cohen, peterhuewe, jgg, linux-kernel, linux-integrity,
Dan.Morav, oren.tanami, shmulik.hager, amir.mizinski
On Wed, May 19, 2021 at 05:00:59PM +0300, amirmizi6@gmail.com wrote:
> From: Amir Mizinski <amirmizi6@gmail.com>
>
> While running a TPM2_CC_VERIFY_SIGNATURE(0x177) operation with RSA 3070-bit
The hexcode for the TPM command is absoulutely irrelevant detail.
AFAIK, 3070-bit does not exist. It's 3072-bit.
> keys the TPM driver fails with the following error:
Empty line here.
> "kernel: [ 2416.187522] tpm tpm0: Operation Timed out"
>
> Since a) the TPM PC Client specification does not specify a number for
Remove "a)".
> verify signature operation timeout, and b) the duration of
Remove "b)".
> TPM2_CC_VERIFY_SIGNATURE with RSA 3070-bit keys exceeds the current timeout
> of TPM_LONG (2 seconds), it is preferable to pick the longest timeout
> possible.
Empty line here.
> Therefore, set the duration for TPM2_CC_VERIFY_SIGNATUE to TPM_LONG_LONG
> (5 minutes).
>
Add here:
Link: https://trustedcomputinggroup.org/resource/pc-client-specific-platform-firmware-profile-specification/
> Signed-off-by: Amir Mizinski <amirmizi6@gmail.com>
> ---
> drivers/char/tpm/tpm2-cmd.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index 7603295..e71154b 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -87,7 +87,7 @@ static u8 tpm2_ordinal_duration_index(u32 ordinal)
> return TPM_MEDIUM;
>
> case TPM2_CC_VERIFY_SIGNATURE: /* 177 */
> - return TPM_LONG;
> + return TPM_LONG_LONG;
>
> case TPM2_CC_PCR_EXTEND: /* 182 */
> return TPM_MEDIUM;
> --
> 2.7.4
>
>
/Jarkko
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