linux-kernel - Re: [PATCH v5 4/7] tpm: modify tpm_pcr_read() definition to pass a TPM hash algorithm

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Message-ID: <20181116134112.GC4163@linux.intel.com>
Date:   Fri, 16 Nov 2018 15:41:12 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Roberto Sassu <roberto.sassu@...wei.com>
Cc:     zohar@...ux.ibm.com, david.safford@...com, monty.wiseman@...com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, silviu.vlasceanu@...wei.com
Subject: Re: [PATCH v5 4/7] tpm: modify tpm_pcr_read() definition to pass a
 TPM hash algorithm

On Wed, Nov 14, 2018 at 04:31:05PM +0100, Roberto Sassu wrote:
> Currently the TPM driver allows other kernel subsystems to read only the
> SHA1 PCR bank. This patch modifies the parameters of tpm_pcr_read() and
> tpm2_pcr_read() to pass a tpm_digest structure, which contains the desired
> hash algorithm. Also, since commit 125a22105410 ("tpm: React correctly to
> RC_TESTING from TPM 2.0 self tests") removed the call to tpm2_pcr_read(),
> the new parameter is expected to be always not NULL.
> 
> Due to the API change, IMA functions have been modified.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> Acked-by: Mimi Zohar <zohar@...ux.ibm.com>
> ---
>  drivers/char/tpm/tpm-interface.c    |  9 +++++----
>  drivers/char/tpm/tpm.h              |  3 ++-
>  drivers/char/tpm/tpm2-cmd.c         | 23 ++++++++++++++++-------
>  include/linux/tpm.h                 |  6 ++++--
>  security/integrity/ima/ima_crypto.c | 10 +++++-----
>  5 files changed, 32 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 96c8261d0f04..04aa39432f58 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -451,11 +451,12 @@ EXPORT_SYMBOL_GPL(tpm_is_tpm2);
>   * tpm_pcr_read - read a PCR value from SHA1 bank
>   * @chip:	a &struct tpm_chip instance, %NULL for the default chip
>   * @pcr_idx:	the PCR to be retrieved
> - * @res_buf:	the value of the PCR
> + * @digest_struct:	the PCR bank and buffer current PCR value is written to
>   *
>   * Return: same as with tpm_transmit_cmd()
>   */
> -int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
> +int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
> +		 struct tpm_digest *digest_struct)

Should be just struct tpm_digest *digest

/Jarkko