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Subject: Re: [PATCH v5 07/17] tpm: declare struct tpm_header
To:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        linux-integrity@vger.kernel.org
Cc:     linux-security-module@vger.kernel.org,
        James Bottomley <James.Bottomley@HansenPartnership.com>,
        Tomas Winkler <tomas.winkler@intel.com>,
        Tadeusz Struk <tadeusz.struk@intel.com>,
        Stefan Berger <stefanb@linux.vnet.ibm.com>,
        Nayna Jain <nayna@linux.ibm.com>,
        Peter Huewe <peterhuewe@gmx.de>,
        Jason Gunthorpe <jgg@ziepe.ca>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Nicolas Ferre <nicolas.ferre@microchip.com>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        open list <linux-kernel@vger.kernel.org>,
        "moderated list:ARM/Microchip (AT91) SoC support" 
        <linux-arm-kernel@lists.infradead.org>
References: <20181108141541.12832-1-jarkko.sakkinen@linux.intel.com>
 <20181108141541.12832-8-jarkko.sakkinen@linux.intel.com>
From:   Stefan Berger <stefanb@linux.ibm.com>
Date:   Thu, 8 Nov 2018 10:02:19 -0500
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On 11/8/18 9:15 AM, Jarkko Sakkinen wrote:
> Decleare struct tpm_header that replaces struct tpm_input_header and
> struct tpm_output_header.
>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

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


> ---
>   drivers/char/tpm/tpm-interface.c  |  9 ++++-----
>   drivers/char/tpm/tpm.h            | 27 ++++++++++++---------------
>   drivers/char/tpm/tpm2-cmd.c       |  4 ++--
>   drivers/char/tpm/tpm2-space.c     |  6 +++---
>   drivers/char/tpm/tpm_i2c_atmel.c  |  5 ++---
>   drivers/char/tpm/tpm_vtpm_proxy.c |  8 ++++----
>   drivers/char/tpm/xen-tpmfront.c   |  2 +-
>   7 files changed, 28 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 28d48799b044..6abbcedc87a3 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -67,7 +67,7 @@ static int tpm_validate_command(struct tpm_chip *chip,
>   				 const u8 *cmd,
>   				 size_t len)
>   {
> -	const struct tpm_input_header *header = (const void *)cmd;
> +	const struct tpm_header *header = (const void *)cmd;
>   	int i;
>   	u32 cc;
>   	u32 attrs;
> @@ -166,7 +166,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
>   				u8 *buf, size_t bufsiz,
>   				unsigned int flags)
>   {
> -	struct tpm_output_header *header = (void *)buf;
> +	struct tpm_header *header = (void *)buf;
>   	int rc;
>   	ssize_t len = 0;
>   	u32 count, ordinal;
> @@ -276,7 +276,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
>   ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
>   		     u8 *buf, size_t bufsiz, unsigned int flags)
>   {
> -	struct tpm_output_header *header = (struct tpm_output_header *)buf;
> +	struct tpm_header *header = (struct tpm_header *)buf;
>   	/* space for header and handles */
>   	u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)];
>   	unsigned int delay_msec = TPM2_DURATION_SHORT;
> @@ -375,8 +375,7 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
>   			 struct tpm_buf *buf, size_t min_rsp_body_length,
>   			 unsigned int flags, const char *desc)
>   {
> -	const struct tpm_output_header *header =
> -		(struct tpm_output_header *)buf->data;
> +	const struct tpm_header *header = (struct tpm_header *)buf->data;
>   	int err;
>   	ssize_t len;
>
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 229ac42b644e..92638ec6ec97 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -273,16 +273,13 @@ struct tpm_chip {
>
>   #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
>
> -struct tpm_input_header {
> -	__be16	tag;
> -	__be32	length;
> -	__be32	ordinal;
> -} __packed;
> -
> -struct tpm_output_header {
> -	__be16	tag;
> -	__be32	length;
> -	__be32	return_code;
> +struct tpm_header {
> +	__be16 tag;
> +	__be32 length;
> +	union {
> +		__be32 ordinal;
> +		__be32 return_code;
> +	};
>   } __packed;
>
>   #define TPM_TAG_RQU_COMMAND 193
> @@ -401,8 +398,8 @@ struct tpm_buf {
>
>   static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)
>   {
> -	struct tpm_input_header *head;
> -	head = (struct tpm_input_header *)buf->data;
> +	struct tpm_header *head = (struct tpm_header *)buf->data;
> +
>   	head->tag = cpu_to_be16(tag);
>   	head->length = cpu_to_be32(sizeof(*head));
>   	head->ordinal = cpu_to_be32(ordinal);
> @@ -428,14 +425,14 @@ static inline void tpm_buf_destroy(struct tpm_buf *buf)
>
>   static inline u32 tpm_buf_length(struct tpm_buf *buf)
>   {
> -	struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
> +	struct tpm_header *head = (struct tpm_header *) buf->data;
>
>   	return be32_to_cpu(head->length);
>   }
>
>   static inline u16 tpm_buf_tag(struct tpm_buf *buf)
>   {
> -	struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
> +	struct tpm_header *head = (struct tpm_header *) buf->data;
>
>   	return be16_to_cpu(head->tag);
>   }
> @@ -444,7 +441,7 @@ static inline void tpm_buf_append(struct tpm_buf *buf,
>   				  const unsigned char *new_data,
>   				  unsigned int new_len)
>   {
> -	struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
> +	struct tpm_header *head = (struct tpm_header *) buf->data;
>   	u32 len = tpm_buf_length(buf);
>
>   	/* Return silently if overflow has already happened. */
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index 2bcf470c8e5d..ab03f8600f89 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -784,7 +784,7 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
>    */
>   int tpm2_probe(struct tpm_chip *chip)
>   {
> -	struct tpm_output_header *out;
> +	struct tpm_header *out;
>   	struct tpm_buf buf;
>   	int rc;
>
> @@ -797,7 +797,7 @@ int tpm2_probe(struct tpm_chip *chip)
>   	rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0, NULL);
>   	/* We ignore TPM return codes on purpose. */
>   	if (rc >=  0) {
> -		out = (struct tpm_output_header *)buf.data;
> +		out = (struct tpm_header *)buf.data;
>   		if (be16_to_cpu(out->tag) == TPM2_ST_NO_SESSIONS)
>   			chip->flags |= TPM_CHIP_FLAG_TPM2;
>   	}
> diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
> index 3d5f9577e5de..393d9aadadce 100644
> --- a/drivers/char/tpm/tpm2-space.c
> +++ b/drivers/char/tpm/tpm2-space.c
> @@ -334,7 +334,7 @@ static int tpm2_map_response_header(struct tpm_chip *chip, u32 cc, u8 *rsp,
>   				    size_t len)
>   {
>   	struct tpm_space *space = &chip->work_space;
> -	struct tpm_output_header *header = (void *)rsp;
> +	struct tpm_header *header = (void *)rsp;
>   	u32 phandle;
>   	u32 phandle_type;
>   	u32 vhandle;
> @@ -394,7 +394,7 @@ static int tpm2_map_response_body(struct tpm_chip *chip, u32 cc, u8 *rsp,
>   				  size_t len)
>   {
>   	struct tpm_space *space = &chip->work_space;
> -	struct tpm_output_header *header = (void *)rsp;
> +	struct tpm_header *header = (void *)rsp;
>   	struct tpm2_cap_handles *data;
>   	u32 phandle;
>   	u32 phandle_type;
> @@ -492,7 +492,7 @@ static int tpm2_save_space(struct tpm_chip *chip)
>   int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space,
>   		      u32 cc, u8 *buf, size_t *bufsiz)
>   {
> -	struct tpm_output_header *header = (void *)buf;
> +	struct tpm_header *header = (void *)buf;
>   	int rc;
>
>   	if (!space)
> diff --git a/drivers/char/tpm/tpm_i2c_atmel.c b/drivers/char/tpm/tpm_i2c_atmel.c
> index 95ce2e9ccdc6..4720b2442ffe 100644
> --- a/drivers/char/tpm/tpm_i2c_atmel.c
> +++ b/drivers/char/tpm/tpm_i2c_atmel.c
> @@ -46,7 +46,7 @@ struct priv_data {
>   	/* This is the amount we read on the first try. 25 was chosen to fit a
>   	 * fair number of read responses in the buffer so a 2nd retry can be
>   	 * avoided in small message cases. */
> -	u8 buffer[sizeof(struct tpm_output_header) + 25];
> +	u8 buffer[sizeof(struct tpm_header) + 25];
>   };
>
>   static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len)
> @@ -72,8 +72,7 @@ static int i2c_atmel_recv(struct tpm_chip *chip, u8 *buf, size_t count)
>   {
>   	struct priv_data *priv = dev_get_drvdata(&chip->dev);
>   	struct i2c_client *client = to_i2c_client(chip->dev.parent);
> -	struct tpm_output_header *hdr =
> -		(struct tpm_output_header *)priv->buffer;
> +	struct tpm_header *hdr = (struct tpm_header *)priv->buffer;
>   	u32 expected_len;
>   	int rc;
>
> diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c
> index 5f95fbfb7f6b..28eb5ab15b99 100644
> --- a/drivers/char/tpm/tpm_vtpm_proxy.c
> +++ b/drivers/char/tpm/tpm_vtpm_proxy.c
> @@ -303,9 +303,9 @@ static int vtpm_proxy_tpm_op_recv(struct tpm_chip *chip, u8 *buf, size_t count)
>   static int vtpm_proxy_is_driver_command(struct tpm_chip *chip,
>   					u8 *buf, size_t count)
>   {
> -	struct tpm_input_header *hdr = (struct tpm_input_header *)buf;
> +	struct tpm_header *hdr = (struct tpm_header *)buf;
>
> -	if (count < sizeof(struct tpm_input_header))
> +	if (count < sizeof(struct tpm_header))
>   		return 0;
>
>   	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> @@ -402,7 +402,7 @@ static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)
>   {
>   	struct tpm_buf buf;
>   	int rc;
> -	const struct tpm_output_header *header;
> +	const struct tpm_header *header;
>   	struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
>
>   	if (chip->flags & TPM_CHIP_FLAG_TPM2)
> @@ -427,7 +427,7 @@ static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)
>   		goto out;
>   	}
>
> -	header = (const struct tpm_output_header *)buf.data;
> +	header = (const struct tpm_header *)buf.data;
>   	rc = be32_to_cpu(header->return_code);
>   	if (rc)
>   		locality = -1;
> diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
> index b150f87f38f5..1259e935fd58 100644
> --- a/drivers/char/tpm/xen-tpmfront.c
> +++ b/drivers/char/tpm/xen-tpmfront.c
> @@ -163,7 +163,7 @@ static int vtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
>   	wmb();
>   	notify_remote_via_evtchn(priv->evtchn);
>
> -	ordinal = be32_to_cpu(((struct tpm_input_header*)buf)->ordinal);
> +	ordinal = be32_to_cpu(((struct tpm_header *)buf)->ordinal);
>   	duration = tpm_calc_ordinal_duration(chip, ordinal);
>
>   	if (wait_for_tpm_stat(chip, VTPM_STATUS_IDLE, duration,