linux-kernel - Re: [PATCH 2/4] [Patch-next] ACPI, APEI, EINJ Fix the wrong checking of Injection Header's length

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Date:	Tue, 17 Aug 2010 09:35:25 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Jin Dongming <jin.dongming@...css.fujitsu.com>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andi Kleen <andi@...stfloor.org>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	ACPI <linux-acpi@...r.kernel.org>,
	LKLM <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] [Patch-next] ACPI, APEI, EINJ Fix the wrong
 checking of Injection Header's length

On Tue, 2010-08-17 at 08:56 +0800, Jin Dongming wrote:
> header_length in struct acpi_table_einj is not the length of struct
> acpi_table_einj, but the length of Injection Header.
> 
> In einj_check_table(), header_length is used for checking the length
> of struct acpi_table_einj. So I think it is wrong.

Why "think"? Do you have a machine with header_length set as you said?

> This patch fixed it and I confirmed it on x86_64 next-tree.
> 
> Signed-off-by: Jin Dongming <jin.dongming@...css.fujitsu.com>
> ---
>  drivers/acpi/apei/einj.c |   15 +++++++++------
>  include/acpi/actbl1.h    |   17 ++++++++++++-----
>  2 files changed, 21 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
> index 465c885..5fe876c 100644
> --- a/drivers/acpi/apei/einj.c
> +++ b/drivers/acpi/apei/einj.c
> @@ -104,7 +104,8 @@ static struct einj_parameter *einj_param;
>  static void einj_exec_ctx_init(struct apei_exec_context *ctx)
>  {
>  	apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type),
> -			   EINJ_TAB_ENTRY(einj_tab), einj_tab->entries);
> +			   EINJ_TAB_ENTRY(einj_tab),
> +			   einj_tab->inje_header.entries);
>  }
>  
>  static int __einj_get_available_error_type(u32 *type)
> @@ -153,7 +154,7 @@ static u64 einj_get_parameter_address(void)
>  	struct acpi_whea_header *entry;
>  
>  	entry = EINJ_TAB_ENTRY(einj_tab);
> -	for (i = 0; i < einj_tab->entries; i++) {
> +	for (i = 0; i < einj_tab->inje_header.entries; i++) {
>  		if (entry->action == ACPI_EINJ_SET_ERROR_TYPE &&
>  		    entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
>  		    entry->register_region.space_id ==
> @@ -426,12 +427,14 @@ DEFINE_SIMPLE_ATTRIBUTE(error_inject_fops, NULL,
>  
>  static int einj_check_table(struct acpi_table_einj *einj_tab)
>  {
> -	if (einj_tab->header_length != sizeof(struct acpi_table_einj))
> +	if (einj_tab->common_header.length < sizeof(struct acpi_table_einj))
>  		return -EINVAL;
> -	if (einj_tab->header.length < sizeof(struct acpi_table_einj))
> +
> +	if (einj_tab->inje_header.length != sizeof(struct acpi_einj_header))
>  		return -EINVAL;
> -	if (einj_tab->entries !=
> -	    (einj_tab->header.length - sizeof(struct acpi_table_einj)) /
> +
> +	if (einj_tab->inje_header.entries !=
> +	    (einj_tab->common_header.length - sizeof(struct acpi_table_einj)) /
>  	    sizeof(struct acpi_einj_entry))
>  		return -EINVAL;
>  
> diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
> index 821f8ac..e586c30 100644
> --- a/include/acpi/actbl1.h
> +++ b/include/acpi/actbl1.h
> @@ -199,14 +199,21 @@ struct acpi_table_ecdt {
>   *
>   ******************************************************************************/
>  
> -struct acpi_table_einj {
> -	struct acpi_table_header header;	/* Common ACPI table header */
> -	u32 header_length;
> -	u8 flags;
> -	u8 reserved[3];
> +/* EINJ Injection Header */
> +struct acpi_einj_header {
> +	u32 length;
> +	u8  flags;
> +	u8  reserved[3];
>  	u32 entries;
>  };
>  
> +/* EINJ Header */
> +
> +struct acpi_table_einj {
> +	struct acpi_table_header common_header;	/* Common ACPI table header */
> +	struct acpi_einj_header inje_header;	/* Injection Header */
> +};

I don't think it is necessary to change the header definition, and
inje_header is not a good name for me.

Best Regards,
Huang Ying


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