linux-kernel - Re: [PATCH 07/10] platform/x86/intel/ifs: Metadata validation for start

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Date:   Fri, 15 Sep 2023 11:07:35 -0700
From:   "Joseph, Jithu" <jithu.joseph@...el.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
CC:     <hdegoede@...hat.com>, <markgross@...nel.org>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <dave.hansen@...ux.intel.com>, <x86@...nel.org>, <hpa@...or.com>,
        <rostedt@...dmis.org>, <ashok.raj@...el.com>,
        <tony.luck@...el.com>, <linux-kernel@...r.kernel.org>,
        <platform-driver-x86@...r.kernel.org>, <patches@...ts.linux.dev>,
        <ravi.v.shankar@...el.com>, <pengfei.xu@...el.com>
Subject: Re: [PATCH 07/10] platform/x86/intel/ifs: Metadata validation for
 start_chunk



On 9/15/2023 9:59 AM, Ilpo Järvinen wrote:
> On Wed, 13 Sep 2023, Jithu Joseph wrote:
> 
>> Add an additional check to validate IFS image metadata field
>> prior to loading the test image.
>>
>> If start_chunk is not a multiple of chunks_per_stride error out.
>>
>> Signed-off-by: Jithu Joseph <jithu.joseph@...el.com>
>> Reviewed-by: Tony Luck <tony.luck@...el.com>
>> Tested-by: Pengfei Xu <pengfei.xu@...el.com>
>> ---
>>  drivers/platform/x86/intel/ifs/load.c | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c
>> index 778a3b89a24d..88630366a23c 100644
>> --- a/drivers/platform/x86/intel/ifs/load.c
>> +++ b/drivers/platform/x86/intel/ifs/load.c
>> @@ -292,6 +292,13 @@ static int validate_ifs_metadata(struct device *dev)
>>  		return ret;
>>  	}
>>  
>> +	if (ifs_meta->chunks_per_stride &&
>> +	    (ifs_meta->starting_chunk % ifs_meta->chunks_per_stride)) {
> 
> While this is not incorrect, it would make the code easier to understand 
> if you add != 0.

Agree ... Will change

Jithu