linux-kernel - Re: [PATCH] driver/char/tpm: declare internal symbols as static

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Date:	Thu, 30 Aug 2012 10:52:48 -0500
From:	Kent Yoder <key@...ux.vnet.ibm.com>
To:	xiaoyan.zhang@...el.com
Cc:	linux-kernel@...r.kernel.org, joseph.cihula@...el.com,
	gang.wei@...el.com, tpmdd-devel@...ts.sourceforge.net,
	m.selhorst@...rix.com, shpedoikal@...il.com,
	linux-security-module@...r.kernel.org, james.l.morris@...cle.com,
	hpa@...or.com, linux-api@...r.kernel.org, fengguang.wu@...el.com
Subject: Re: [PATCH] driver/char/tpm: declare internal symbols as static

On Thu, Aug 29, 2013 at 08:39:11PM +0800, xiaoyan.zhang@...el.com wrote:
> From: Xiaoyan Zhang <xiaoyan.zhang@...el.com>
> 
> This patch declares the internal struct and functions as static to provide
> more security.

  Thanks, this looks good to me.  James, can you apply this directly to
security-next?

Kent

Reviewed-by: Kent Yoder <key@...ux.vnet.ibm.com>

> 
> Signed-off-by: Xiaoyan Zhang <xiaoyan.zhang@...el.com>
> Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
> ---
>  drivers/char/tpm/tpm.c     |    4 ++--
>  drivers/char/tpm/tpm_ppi.c |   37 +++++++++++++++++++------------------
>  2 files changed, 21 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
> index 39526c0..6724615 100644
> --- a/drivers/char/tpm/tpm.c
> +++ b/drivers/char/tpm/tpm.c
> @@ -915,7 +915,7 @@ EXPORT_SYMBOL_GPL(tpm_show_pcrs);
> 
>  #define  READ_PUBEK_RESULT_SIZE 314
>  #define TPM_ORD_READPUBEK cpu_to_be32(124)
> -struct tpm_input_header tpm_readpubek_header = {
> +static struct tpm_input_header tpm_readpubek_header = {
>  	.tag = TPM_TAG_RQU_COMMAND,
>  	.length = cpu_to_be32(30),
>  	.ordinal = TPM_ORD_READPUBEK
> @@ -1395,7 +1395,7 @@ EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
>   * Once all references to platform device are down to 0,
>   * release all allocated structures.
>   */
> -void tpm_dev_release(struct device *dev)
> +static void tpm_dev_release(struct device *dev)
>  {
>  	struct tpm_chip *chip = dev_get_drvdata(dev);
> 
> diff --git a/drivers/char/tpm/tpm_ppi.c b/drivers/char/tpm/tpm_ppi.c
> index 440fa1c..f27b58c 100644
> --- a/drivers/char/tpm/tpm_ppi.c
> +++ b/drivers/char/tpm/tpm_ppi.c
> @@ -53,8 +53,8 @@ static inline void ppi_assign_params(union acpi_object params[4],
>  	params[3].package.elements = NULL;
>  }
> 
> -ssize_t tpm_show_ppi_version(struct device *dev, struct device_attribute *attr,
> -			     char *buf)
> +static ssize_t tpm_show_ppi_version(struct device *dev,
> +				    struct device_attribute *attr, char *buf)
>  {
>  	acpi_handle handle;
>  	acpi_status status;
> @@ -82,9 +82,8 @@ ssize_t tpm_show_ppi_version(struct device *dev, struct device_attribute *attr,
>  	return status;
>  }
> 
> -ssize_t tpm_show_ppi_request(struct device *dev,
> -			     struct device_attribute *attr,
> -			     char *buf)
> +static ssize_t tpm_show_ppi_request(struct device *dev,
> +				    struct device_attribute *attr, char *buf)
>  {
>  	acpi_handle handle;
>  	acpi_status status;
> @@ -132,9 +131,9 @@ cleanup:
>  	return status;
>  }
> 
> -ssize_t tpm_store_ppi_request(struct device *dev,
> -			      struct device_attribute *attr,
> -			      const char *buf, size_t count)
> +static ssize_t tpm_store_ppi_request(struct device *dev,
> +				     struct device_attribute *attr,
> +				     const char *buf, size_t count)
>  {
>  	char version[PPI_VERSION_LEN + 1];
>  	acpi_handle handle;
> @@ -207,9 +206,9 @@ ssize_t tpm_store_ppi_request(struct device *dev,
>  	return status;
>  }
> 
> -ssize_t tpm_show_ppi_transition_action(struct device *dev,
> -				       struct device_attribute *attr,
> -				       char *buf)
> +static ssize_t tpm_show_ppi_transition_action(struct device *dev,
> +					      struct device_attribute *attr,
> +					      char *buf)
>  {
>  	char version[PPI_VERSION_LEN + 1];
>  	acpi_handle handle;
> @@ -269,9 +268,9 @@ ssize_t tpm_show_ppi_transition_action(struct device *dev,
>  	return status;
>  }
> 
> -ssize_t tpm_show_ppi_response(struct device *dev,
> -			      struct device_attribute *attr,
> -			      char *buf)
> +static ssize_t tpm_show_ppi_response(struct device *dev,
> +				     struct device_attribute *attr,
> +				     char *buf)
>  {
>  	acpi_handle handle;
>  	acpi_status status;
> @@ -413,14 +412,16 @@ static ssize_t show_ppi_operations(char *buf, u32 start, u32 end)
>  	return str - buf;
>  }
> 
> -ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
> -				   struct device_attribute *attr, char *buf)
> +static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
> +					   struct device_attribute *attr,
> +					   char *buf)
>  {
>  	return show_ppi_operations(buf, 0, PPI_TPM_REQ_MAX);
>  }
> 
> -ssize_t tpm_show_ppi_vs_operations(struct device *dev,
> -				  struct device_attribute *attr, char *buf)
> +static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
> +					  struct device_attribute *attr,
> +					  char *buf)
>  {
>  	return show_ppi_operations(buf, PPI_VS_REQ_START, PPI_VS_REQ_END);
>  }
> -- 
> 1.7.7.6
> 

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