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 11:15:38 +0900
From:	Jin Dongming <jin.dongming@...css.fujitsu.com>
To:	Huang Ying <ying.huang@...el.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

(2010/08/17 10:35), Huang Ying wrote:
> 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?
> 
Here it is same as [Patch 1/4].

>> 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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