linux-kernel - Re: [PATCH v6 2/8] tpm: Remove tpm

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Message-ID: <3d900dea-5636-4773-9344-61315c5b7fad@linux.ibm.com>
Date:   Mon, 27 Nov 2023 15:37:15 -0500
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>,
        linux-integrity@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        William Roberts <bill.c.roberts@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Mario Limonciello <mario.limonciello@....com>,
        Jerry Snitselaar <jsnitsel@...hat.com>
Subject: Re: [PATCH v6 2/8] tpm: Remove tpm_send()



On 11/23/23 21:02, Jarkko Sakkinen wrote:
> Open code the last remaining call site for tpm_send().
> 
> Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>

Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>

> ---
> v1 [2023-11-21]: A new patch.
> ---
>   drivers/char/tpm/tpm-interface.c          | 25 -----------------------
>   include/linux/tpm.h                       |  5 -----
>   security/keys/trusted-keys/trusted_tpm1.c | 14 +++++++++++--
>   3 files changed, 12 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 66b16d26eecc..163ae247bff2 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -342,31 +342,6 @@ int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
>   }
>   EXPORT_SYMBOL_GPL(tpm_pcr_extend);
>   
> -/**
> - * tpm_send - send a TPM command
> - * @chip:	a &struct tpm_chip instance, %NULL for the default chip
> - * @cmd:	a TPM command buffer
> - * @buflen:	the length of the TPM command buffer
> - *
> - * Return: same as with tpm_transmit_cmd()
> - */
> -int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
> -{
> -	struct tpm_buf buf;
> -	int rc;
> -
> -	chip = tpm_find_get_ops(chip);
> -	if (!chip)
> -		return -ENODEV;
> -
> -	buf.data = cmd;
> -	rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to a send a command");
> -
> -	tpm_put_ops(chip);
> -	return rc;
> -}
> -EXPORT_SYMBOL_GPL(tpm_send);
> -
>   int tpm_auto_startup(struct tpm_chip *chip)
>   {
>   	int rc;
> diff --git a/include/linux/tpm.h b/include/linux/tpm.h
> index 6588ca87cf93..d9d645e9c52c 100644
> --- a/include/linux/tpm.h
> +++ b/include/linux/tpm.h
> @@ -422,7 +422,6 @@ extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
>   			struct tpm_digest *digest);
>   extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
>   			  struct tpm_digest *digests);
> -extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
>   extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
>   extern struct tpm_chip *tpm_default_chip(void);
>   void tpm2_flush_context(struct tpm_chip *chip, u32 handle);
> @@ -443,10 +442,6 @@ static inline int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
>   	return -ENODEV;
>   }
>   
> -static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
> -{
> -	return -ENODEV;
> -}
>   static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
>   {
>   	return -ENODEV;
> diff --git a/security/keys/trusted-keys/trusted_tpm1.c b/security/keys/trusted-keys/trusted_tpm1.c
> index aa108bea6739..37bce84eef99 100644
> --- a/security/keys/trusted-keys/trusted_tpm1.c
> +++ b/security/keys/trusted-keys/trusted_tpm1.c
> @@ -356,17 +356,27 @@ static int TSS_checkhmac2(unsigned char *buffer,
>    */
>   int trusted_tpm_send(unsigned char *cmd, size_t buflen)
>   {
> +	struct tpm_buf buf;
>   	int rc;
>   
>   	if (!chip)
>   		return -ENODEV;
>   
> +	rc = tpm_try_get_ops(chip);
> +	if (rc)
> +		return rc;
> +
> +	buf.flags = 0;
> +	buf.data = cmd;
>   	dump_tpm_buf(cmd);
> -	rc = tpm_send(chip, cmd, buflen);
> +	rc = tpm_transmit_cmd(chip, &buf, 4, "sending data");
>   	dump_tpm_buf(cmd);
> +
>   	if (rc > 0)
> -		/* Can't return positive return codes values to keyctl */
> +		/* TPM error */
>   		rc = -EPERM;
> +
> +	tpm_put_ops(chip);
>   	return rc;
>   }
>   EXPORT_SYMBOL_GPL(trusted_tpm_send);