diff options
| author | axelj <axelj@axis.com> | 2021-12-13 08:09:25 +0100 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko@kernel.org> | 2022-01-09 00:18:47 +0200 |
| commit | 0aa698787aa2a9e8840987e54ba2982559de6404 (patch) | |
| tree | b88980d6e9d9375033f621b4ce7df68430b7b54d /include/linux/tpm.h | |
| parent | 5887d7f4a8c4310a75ca45f576f26b3d21250881 (diff) | |
tpm: Add Upgrade/Reduced mode support for TPM2 modules
If something went wrong during the TPM firmware upgrade, like power
failure or the firmware image file get corrupted, the TPM might end
up in Upgrade or Failure mode upon the next start. The state is
persistent between the TPM power cycle/restart.
According to TPM specification:
* If the TPM is in Upgrade mode, it will answer with TPM2_RC_UPGRADE
to all commands except TPM2_FieldUpgradeData(). It may also accept
other commands if it is able to complete them using the previously
installed firmware.
* If the TPM is in Failure mode, it will allow performing TPM
initialization but will not provide any crypto operations.
Will happily respond to Field Upgrade calls.
Change the behavior of the tpm2_auto_startup(), so it detects the active
running mode of the TPM by adding the following checks. If
tpm2_do_selftest() call returns TPM2_RC_UPGRADE, the TPM is in Upgrade
mode.
If the TPM is in Failure mode, it will successfully respond to both
tpm2_do_selftest() and tpm2_startup() calls. Although, will fail to
answer to tpm2_get_cc_attrs_tbl(). Use this fact to conclude that TPM is
in Failure mode.
If detected that the TPM is in the Upgrade or Failure mode, the function
sets TPM_CHIP_FLAG_FIRMWARE_UPGRADE_MODE flag.
The TPM_CHIP_FLAG_FIRMWARE_UPGRADE_MODE flag is used later during driver
initialization/deinitialization to disable functionality which makes no
sense or will fail in the current TPM state. Following functionality is
affected:
* Do not register TPM as a hwrng
* Do not register sysfs entries which provide information impossible to
obtain in limited mode
* Do not register resource managed character device
Signed-off-by: axelj <axelj@axis.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Diffstat (limited to 'include/linux/tpm.h')
| -rw-r--r-- | include/linux/tpm.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 12d827734686..dfeb25a0362d 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -207,6 +207,7 @@ enum tpm2_return_codes { TPM2_RC_INITIALIZE = 0x0100, /* RC_VER1 */ TPM2_RC_FAILURE = 0x0101, TPM2_RC_DISABLED = 0x0120, + TPM2_RC_UPGRADE = 0x012D, TPM2_RC_COMMAND_CODE = 0x0143, TPM2_RC_TESTING = 0x090A, /* RC_WARN */ TPM2_RC_REFERENCE_H0 = 0x0910, @@ -278,6 +279,7 @@ enum tpm_chip_flags { TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4), TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5), TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED = BIT(6), + TPM_CHIP_FLAG_FIRMWARE_UPGRADE = BIT(7), }; #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev) @@ -399,6 +401,14 @@ static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value) tpm_buf_append(buf, (u8 *) &value2, 4); } +/* + * Check if TPM device is in the firmware upgrade mode. + */ +static inline bool tpm_is_firmware_upgrade(struct tpm_chip *chip) +{ + return chip->flags & TPM_CHIP_FLAG_FIRMWARE_UPGRADE; +} + static inline u32 tpm2_rc_value(u32 rc) { return (rc & BIT(7)) ? rc & 0xff : rc; |