linux-kernel - Re: [PATCH v4 02/11] tpm: Export and rename tpm2_find_and_validate

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Date:   Mon, 7 Nov 2022 13:37:49 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Evan Green <evgreen@...omium.org>
Cc:     linux-kernel@...r.kernel.org, corbet@....net,
        linux-pm@...r.kernel.org, rjw@...ysocki.net, gwendal@...omium.org,
        apronin@...omium.org, Pavel Machek <pavel@....cz>,
        Kees Cook <keescook@...omium.org>,
        Matthew Garrett <mgarrett@...ora.tech>,
        linux-integrity@...r.kernel.org, jejb@...ux.ibm.com,
        zohar@...ux.ibm.com, dlunev@...gle.com,
        Eric Biggers <ebiggers@...nel.org>,
        Ben Boeckel <me@...boeckel.net>,
        Jason Gunthorpe <jgg@...pe.ca>, Peter Huewe <peterhuewe@....de>
Subject: Re: [PATCH v4 02/11] tpm: Export and rename
 tpm2_find_and_validate_cc()

On Thu, Nov 03, 2022 at 11:01:10AM -0700, Evan Green wrote:
> Export tpm_find_and_validate_cc() since it will be needed by an upcoming
> change allowing access to certain PCRs to be restricted to the kernel.
> In order to export it consistently, and because it's a tpm2-only
> function, rename it to tpm2_find_and_validate_cc().
> 
> Signed-off-by: Evan Green <evgreen@...omium.org>
> 
> ---
> 
> (no changes since v3)
> 
> Changes in v3:
>  - Split find_and_validate_cc() export to its own patch (Jarkko)
>  - Rename tpm_find_and_validate_cc() to tpm2_find_and_validate_cc().
> 
>  drivers/char/tpm/tpm.h        | 3 +++
>  drivers/char/tpm/tpm2-space.c | 8 ++++----
>  2 files changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 24ee4e1cc452a0..f1e0f490176f01 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -231,6 +231,9 @@ int tpm2_find_cc(struct tpm_chip *chip, u32 cc);
>  int tpm2_init_space(struct tpm_space *space, unsigned int buf_size);
>  void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space);
>  void tpm2_flush_space(struct tpm_chip *chip);
> +int tpm2_find_and_validate_cc(struct tpm_chip *chip,
> +			      struct tpm_space *space,
> +			      const void *cmd, size_t len);
>  int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u8 *cmd,
>  		       size_t cmdsiz);
>  int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, void *buf,
> diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
> index ffb35f0154c16c..ca34cc006e7f8d 100644
> --- a/drivers/char/tpm/tpm2-space.c
> +++ b/drivers/char/tpm/tpm2-space.c
> @@ -262,9 +262,9 @@ static int tpm2_map_command(struct tpm_chip *chip, u32 cc, u8 *cmd)
>  	return 0;
>  }
>  
> -static int tpm_find_and_validate_cc(struct tpm_chip *chip,
> -				    struct tpm_space *space,
> -				    const void *cmd, size_t len)
> +int tpm2_find_and_validate_cc(struct tpm_chip *chip,
> +			      struct tpm_space *space,
> +			      const void *cmd, size_t len)
>  {
>  	const struct tpm_header *header = (const void *)cmd;
>  	int i;
> @@ -306,7 +306,7 @@ int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u8 *cmd,
>  	if (!space)
>  		return 0;
>  
> -	cc = tpm_find_and_validate_cc(chip, space, cmd, cmdsiz);
> +	cc = tpm2_find_and_validate_cc(chip, space, cmd, cmdsiz);
>  	if (cc < 0)
>  		return cc;
>  
> -- 
> 2.38.1.431.g37b22c650d-goog
> 

Acked-by: Jarkko Sakkinen <jarkko@...nel.org>

BR, Jarkko