diff options
| author | Tomas Winkler <tomas.winkler@intel.com> | 2018-10-19 21:23:07 +0300 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2018-11-13 13:46:31 +0200 |
| commit | 95adc6b410b7aa895dcf5ed9cb7dc4a20a3d5c5a (patch) | |
| tree | 0062d5eafaa2653c41a74382f6f77cb8f4f54334 /drivers/char/tpm/tpm-interface.c | |
| parent | c82e59541a226504a3fe45eb4efca70836548da6 (diff) | |
| download | linux-95adc6b410b7aa895dcf5ed9cb7dc4a20a3d5c5a.tar.gz | |
tpm: use u32 instead of int for PCR index
The TPM specs defines PCR index as a positive number, and there is
no reason to use a signed number. It is also a possible security
issue as currently no functions check for a negative index,
which may become a large number when converted to u32.
Adjust the API to use u32 instead of int in all PCR related
functions.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char/tpm/tpm-interface.c')
| -rw-r--r-- | drivers/char/tpm/tpm-interface.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 014354e3dd1e..1ba033b13ab2 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -38,7 +38,7 @@ * recently changed pcr on suspend, so force the flush * with an extend to the selected _unused_ non-volatile pcr. */ -static int tpm_suspend_pcr; +static u32 tpm_suspend_pcr; module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644); MODULE_PARM_DESC(suspend_pcr, "PCR to use for dummy writes to facilitate flush on suspend."); @@ -454,7 +454,7 @@ EXPORT_SYMBOL_GPL(tpm_is_tpm2); * * Return: same as with tpm_transmit_cmd() */ -int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) +int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf) { int rc; @@ -484,7 +484,7 @@ EXPORT_SYMBOL_GPL(tpm_pcr_read); * * Return: same as with tpm_transmit_cmd() */ -int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash) +int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash) { int rc; struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)]; |