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| author | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2017-01-26 00:00:22 +0300 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2017-02-03 23:03:14 +0300 |
| commit | 7d761119a914ec0ac05ec2a5378d1f86e680967d (patch) | |
| tree | 6bc37ee3c9fedc7a375104bb1beab183f25de855 /drivers/char | |
| parent | 419a16d9cda3408090704d5e3956c866e18f0af6 (diff) | |
| download | linux-7d761119a914ec0ac05ec2a5378d1f86e680967d.tar.xz | |
tpm: fix RC value check in tpm2_seal_trusted
The error code handling is broken as any error code that has the same
bits set as TPM_RC_HASH passes. Implemented tpm2_rc_value() helper to
parse the error value from FMT0 and FMT1 error codes so that these types
of mistakes are prevented in the future.
Fixes: 5ca4c20cfd37 ("keys, trusted: select hash algorithm for TPM2 chips")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm.h | 5 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm2-cmd.c | 2 |
2 files changed, 6 insertions, 1 deletions
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 244fcffdab6b..dbe0c5a72c67 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -519,6 +519,11 @@ static inline void tpm_add_ppi(struct tpm_chip *chip) } #endif +static inline inline u32 tpm2_rc_value(u32 rc) +{ + return (rc & BIT(7)) ? rc & 0xff : rc; +} + int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf); int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash); int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max); diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index a0199f18f7fb..42fe3dde0d8c 100644 --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -546,7 +546,7 @@ out: tpm_buf_destroy(&buf); if (rc > 0) { - if ((rc & TPM2_RC_HASH) == TPM2_RC_HASH) + if (tpm2_rc_value(rc) == TPM2_RC_HASH) rc = -EINVAL; else rc = -EPERM; |