On Sun, May 07, 2017 at 08:50:02PM +0300, Jarkko Sakkinen wrote:
> You should not do arithmetic with __be32 or __le32 types because
> sometimes it results incorrect results. Calculations must be done only
> with integers that are in in the CPU byte order. This commit migrates
> tpm_getcap() to struct tpm_buf in order to sort out these issues.
>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
> ---
> Now this should work as Robertos patches move byte order conversion
> where it should be. Sadly I'm out of reach to my Dell E6400 laptop
> that I use for TPM 1.2 testing.
> drivers/char/tpm/tpm-interface.c | 30 ++++++++++++++++--------------
> drivers/char/tpm/tpm.h | 13 -------------
> 2 files changed, 16 insertions(+), 27 deletions(-)
I've now tested this with TPM 1.2. Any complains?
/Jarkko
> diff --git a/drivers/char/tpm/tpm-interface.c
> b/drivers/char/tpm/tpm-interface.c
> index 4ed08ab4d2a8..7436422458c7 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -552,31 +552,33 @@ static const struct tpm_input_header tpm_getcap_header
> = {
> ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
> const char *desc, size_t min_cap_length)
> {
> - struct tpm_cmd_t tpm_cmd;
> + struct tpm_buf buf;
> int rc;
>
> - tpm_cmd.header.in = tpm_getcap_header;
> + rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);
> + if (rc)
> + return rc;
> +
> if (subcap_id == TPM_CAP_VERSION_1_1 ||
> subcap_id == TPM_CAP_VERSION_1_2) {
> - tpm_cmd.params.getcap_in.cap = cpu_to_be32(subcap_id);
> - /*subcap field not necessary */
> - tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
> - tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
> + tpm_buf_append_u32(&buf, subcap_id);
> + tpm_buf_append_u32(&buf, 0);
> } else {
> if (subcap_id == TPM_CAP_FLAG_PERM ||
> subcap_id == TPM_CAP_FLAG_VOL)
> - tpm_cmd.params.getcap_in.cap =
> - cpu_to_be32(TPM_CAP_FLAG);
> + tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
> else
> - tpm_cmd.params.getcap_in.cap =
> - cpu_to_be32(TPM_CAP_PROP);
> - tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
> - tpm_cmd.params.getcap_in.subcap = cpu_to_be32(subcap_id);
> + tpm_buf_append_u32(&buf, TPM_CAP_PROP);
> +
> + tpm_buf_append_u32(&buf, 4);
> + tpm_buf_append_u32(&buf, subcap_id);
> }
> - rc = tpm_transmit_cmd(chip, NULL, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
> + rc = tpm_transmit_cmd(chip, NULL, buf.data, TPM_INTERNAL_RESULT_SIZE,
> min_cap_length, 0, desc);
> if (!rc)
> - *cap = tpm_cmd.params.getcap_out.cap;
> + *cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
> +
> + tpm_buf_destroy(&buf);
> return rc;
> }
> EXPORT_SYMBOL_GPL(tpm_getcap);
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index e81d8c7acb39..dd1173427fb2 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -339,17 +339,6 @@ enum tpm_sub_capabilities {
> TPM_CAP_PROP_TIS_DURATION = 0x120,
> };
>
> -struct tpm_getcap_params_in {
> - __be32 cap;
> - __be32 subcap_size;
> - __be32 subcap;
> -} __packed;
> -
> -struct tpm_getcap_params_out {
> - __be32 cap_size;
> - cap_t cap;
> -} __packed;
> -
> struct tpm_readpubek_params_out {
> u8 algorithm[4];
> u8 encscheme[2];
> @@ -399,10 +388,8 @@ struct tpm_startup_in {
> } __packed;
>
> typedef union {
> - struct tpm_getcap_params_out getcap_out;
> struct tpm_readpubek_params_out readpubek_out;
> u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
> - struct tpm_getcap_params_in getcap_in;
> struct tpm_pcrread_in pcrread_in;
> struct tpm_pcrread_out pcrread_out;
> struct tpm_pcrextend_in pcrextend_in;
> --
> 2.11.0
>
