linux-kernel - Re: [PATCH V3 5/9] tools/arch/x86/intel_sdsi: Fix maximum meter bundle length

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Date: Mon, 8 Apr 2024 19:59:27 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: "David E. Box" <david.e.box@...ux.intel.com>
cc: Hans de Goede <hdegoede@...hat.com>, platform-driver-x86@...r.kernel.org, 
    LKML <linux-kernel@...r.kernel.org>, 
    sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH V3 5/9] tools/arch/x86/intel_sdsi: Fix maximum meter
 bundle length

On Thu, 4 Apr 2024, David E. Box wrote:

> The maximum number of bundles in the meter certificate was set to 8 which
> is much less than the maximum. Instead, since the bundles appear at the end
> of the file, set it based on the remaining file size from the bundle start
> position.
> 
> Fixes: 7fdc03a7370f ("tools/arch/x86: intel_sdsi: Add support for reading meter certificates")
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> ---
> 
> V3 - Add suggested macros for the number of bundles and bundle size.
> 
> V2 - Split of V1 patch 7
> 
>  tools/arch/x86/intel_sdsi/intel_sdsi.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/arch/x86/intel_sdsi/intel_sdsi.c b/tools/arch/x86/intel_sdsi/intel_sdsi.c
> index 2cd92761f171..7eaffcbff788 100644
> --- a/tools/arch/x86/intel_sdsi/intel_sdsi.c
> +++ b/tools/arch/x86/intel_sdsi/intel_sdsi.c
> @@ -43,7 +43,6 @@
>  #define METER_CERT_MAX_SIZE	4096
>  #define STATE_MAX_NUM_LICENSES	16
>  #define STATE_MAX_NUM_IN_BUNDLE	(uint32_t)8
> -#define METER_MAX_NUM_BUNDLES	8
>  
>  #define __round_mask(x, y) ((__typeof__(x))((y) - 1))
>  #define round_up(x, y) ((((x) - 1) | __round_mask(x, y)) + 1)
> @@ -167,6 +166,11 @@ struct bundle_encoding_counter {
>  	uint32_t encoding;
>  	uint32_t counter;
>  };
> +#define METER_BUNDLE_SIZE sizeof(struct bundle_encoding_counter)
> +#define BUNDLE_COUNT(length) ((length) / METER_BUNDLE_SIZE)
> +#define METER_MAX_NUM_BUNDLES							\
> +		((METER_CERT_MAX_SIZE - sizeof(struct meter_certificate)) /	\
> +		 sizeof(struct bundle_encoding_counter))
>  
>  struct sdsi_dev {
>  	struct sdsi_regs regs;
> @@ -386,9 +390,9 @@ static int sdsi_meter_cert_show(struct sdsi_dev *s)
>  		return -1;
>  	}
>  
> -	if (mc->bundle_length > METER_MAX_NUM_BUNDLES * 8)  {
> -		fprintf(stderr, "More than %d bundles: %d\n",
> -			METER_MAX_NUM_BUNDLES, mc->bundle_length / 8);
> +	if (mc->bundle_length > METER_MAX_NUM_BUNDLES * METER_BUNDLE_SIZE)  {
> +		fprintf(stderr, "More than %ld bundles: actual %ld\n",
> +			METER_MAX_NUM_BUNDLES, BUNDLE_COUNT(mc->bundle_length));
>  		return -1;
>  	}

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.