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| author |   Michal Suchanek <msuchanek@suse.de> | 2025-04-04 10:23:14 +0200 |
|---|---|---|
| committer |   Jarkko Sakkinen <jarkko@kernel.org> | 2025-05-15 04:49:15 +0300 |
| commit | 2f661f71fda1fc0c42b7746ca5b7da529eb6b5be (patch) | |
| tree | 39e4db48939743de7a90b081e839d0886877bbb2 | |
| parent | char: tpm: tpm-buf: Add sanity check fallback in read helpers (diff) | |
| download | wireguard-linux-2f661f71fda1fc0c42b7746ca5b7da529eb6b5be.tar.xz wireguard-linux-2f661f71fda1fc0c42b7746ca5b7da529eb6b5be.zip | |
tpm: tis: Double the timeout B to 4s
With some Infineon chips the timeouts in tpm_tis_send_data (both B and
C) can reach up to about 2250 ms.
Timeout C is retried since
commit de9e33df7762 ("tpm, tpm_tis: Workaround failed command reception on Infineon devices")
Timeout B still needs to be extended.
The problem is most commonly encountered with context related operation
such as load context/save context. These are issued directly by the
kernel, and there is no retry logic for them.
When a filesystem is set up to use the TPM for unlocking the boot fails,
and restarting the userspace service is ineffective. This is likely
because ignoring a load context/save context result puts the real TPM
state and the TPM state expected by the kernel out of sync.
Chips known to be affected:
tpm_tis IFX1522:00: 2.0 TPM (device-id 0x1D, rev-id 54)
Description: SLB9672
Firmware Revision: 15.22
tpm_tis MSFT0101:00: 2.0 TPM (device-id 0x1B, rev-id 22)
Firmware Revision: 7.83
tpm_tis MSFT0101:00: 2.0 TPM (device-id 0x1A, rev-id 16)
Firmware Revision: 5.63
Link: https://lore.kernel.org/linux-integrity/Z5pI07m0Muapyu9w@kitsune.suse.cz/
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/char/tpm/tpm_tis_core.h | 2 | ||||
| -rw-r--r-- | include/linux/tpm.h | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h index 970d02c337c7..6c3aa480396b 100644 --- a/drivers/char/tpm/tpm_tis_core.h +++ b/drivers/char/tpm/tpm_tis_core.h @@ -54,7 +54,7 @@ enum tis_int_flags { enum tis_defaults { TIS_MEM_LEN = 0x5000, TIS_SHORT_TIMEOUT = 750, /* ms */ - TIS_LONG_TIMEOUT = 2000, /* 2 sec */ + TIS_LONG_TIMEOUT = 4000, /* 4 secs */ TIS_TIMEOUT_MIN_ATML = 14700, /* usecs */ TIS_TIMEOUT_MAX_ATML = 15000, /* usecs */ }; diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 9ac9768cc8f7..a3d8305e88a5 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -224,7 +224,7 @@ enum tpm2_const { enum tpm2_timeouts { TPM2_TIMEOUT_A = 750, - TPM2_TIMEOUT_B = 2000, + TPM2_TIMEOUT_B = 4000, TPM2_TIMEOUT_C = 200, TPM2_TIMEOUT_D = 30, TPM2_DURATION_SHORT = 20, |