On Wed, Feb 08, 2023 at 11:58:36AM -0800, Julien Gomes wrote:
> Some TPM 2.0 devices have support for additional commands which are not
> part of the TPM 2.0 specifications.
> These commands are identified with bit 29 of the 32 bits command codes.
> Contrarily to other fields of the TPMA_CC spec structure used to list
> available commands, the Vendor flag also has to be present in the
> command code itself (TPM_CC) when called.
>
> Add this flag to tpm_find_cc() mask to prevent blocking vendor command
> codes that can actually be supported by the underlying TPM device.
>
> Signed-off-by: Julien Gomes <julien@xxxxxxxxxx>
> ---
> drivers/char/tpm/tpm2-cmd.c | 4 +++-
> include/linux/tpm.h | 1 +
> 2 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index 65d03867e114..93545be190a5 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -777,10 +777,12 @@ int tpm2_auto_startup(struct tpm_chip *chip)
>
> int tpm2_find_cc(struct tpm_chip *chip, u32 cc)
> {
> + u32 cc_mask;
> int i;
>
> + cc_mask = 1 << TPM2_CC_ATTR_VENDOR | GENMASK(15, 0);
> for (i = 0; i < chip->nr_commands; i++)
> - if (cc == (chip->cc_attrs_tbl[i] & GENMASK(15, 0)))
> + if (cc == (chip->cc_attrs_tbl[i] & cc_mask))
> return i;
>
> return -1;
> diff --git a/include/linux/tpm.h b/include/linux/tpm.h
> index dfeb25a0362d..4dc97b9f65fb 100644
> --- a/include/linux/tpm.h
> +++ b/include/linux/tpm.h
> @@ -265,6 +265,7 @@ enum tpm2_startup_types {
> enum tpm2_cc_attrs {
> TPM2_CC_ATTR_CHANDLES = 25,
> TPM2_CC_ATTR_RHANDLE = 28,
> + TPM2_CC_ATTR_VENDOR = 29,
> };
>
> #define TPM_VID_INTEL 0x8086
> --
> 2.39.1
>
Just checking: did you run testing/selftests/tpm2?
BR, Jarkko
