linux-kernel - Re: [PATCH v3 6/9] platform/x86/intel/ifs: Metadata validation for start

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Date:   Mon, 2 Oct 2023 14:47:08 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Jithu Joseph <jithu.joseph@...el.com>
cc:     Hans de Goede <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,
        LKML <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 v3 6/9] platform/x86/intel/ifs: Metadata validation for
 start_chunk

On Fri, 29 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 da54fd060878..6f8abb4729e9 100644
> --- a/drivers/platform/x86/intel/ifs/load.c
> +++ b/drivers/platform/x86/intel/ifs/load.c
> @@ -291,6 +291,13 @@ 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 != 0)) {
> +		dev_warn(dev, "Starting chunk num %d not a multiple of chunks_per_stride %d\n",
> +			 ifs_meta->starting_chunk, ifs_meta->chunks_per_stride);

Please use %u as both are u32s.

-- 
 i.

> +		return ret;
> +	}
> +
>  	return 0;
>  }
>  
>