[PATCH 3/4] dmi: dmicheck: add a helper function to check a reserved offset

[Colin Ian King]

On 12/05/17 03:06, Alex Hung wrote:
> dmi_reserved_uint8_checkk is a function to check reserved
> offset is zero. This patch also check reserved offset in type 13.
> 
> Signed-off-by: Alex Hung <alex.hung at canonical.com>
> ---
>  src/dmi/dmicheck/dmicheck.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/src/dmi/dmicheck/dmicheck.c b/src/dmi/dmicheck/dmicheck.c
> index 3234153..c7fb11b 100644
> --- a/src/dmi/dmicheck/dmicheck.c
> +++ b/src/dmi/dmicheck/dmicheck.c
> @@ -54,6 +54,7 @@
>  #define DMI_INVALID_HARDWARE_ENTRY	"DMIInvalidHardwareEntry"
>  #define DMI_RESERVED_VALUE_USED		"DMIReservedValueUsed"
>  #define DMI_RESERVED_BIT_USED		"DMIReservedBitUsed"
> +#define DMI_RESERVED_OFFSET_NONZERO	"DMIReservedOffsetNonZero"
>  
>  #define GET_UINT16(x) (uint16_t)(*(const uint16_t *)(x))
>  #define GET_UINT32(x) (uint32_t)(*(const uint32_t *)(x))
> @@ -842,6 +843,22 @@ static void dmi_reserved_bits_check(fwts_framework *fw,
>  	}
>  }
>  
> +static void dmi_reserved_uint8_check(fwts_framework *fw,
> +	const char *table,
> +	uint32_t addr,
> +	const char *field,
> +	const fwts_dmi_header *hdr,
> +	uint8_t offset)
> +{
> +	if (hdr->data[offset] != 0) {
> +		fwts_failed(fw, LOG_LEVEL_MEDIUM, DMI_RESERVED_OFFSET_NONZERO,
> +			"Reserved offset value is 0x%2.2" PRIx8 " (nonzero) "
> +			"while accessing entry '%s' @ 0x%8.8" PRIx32
> +			", field '%s', offset 0x%2.2" PRIx8,
> +			hdr->data[offset], table, addr, field, offset);
> +	}
> +}
> +
>  static void dmi_min_max_uint16_check(fwts_framework *fw,
>  	const char *table,
>  	uint32_t addr,
> @@ -1367,6 +1384,10 @@ static void dmicheck_entry(fwts_framework *fw,
>  			if (hdr->length < 0x6)
>  				break;
>  			dmi_reserved_bits_check(fw, table, addr, "Flags", hdr, sizeof(uint8_t), 0x5, 1, 7);
> +			if (hdr->length < 0x15)
> +				break;
> +			for (i = 0x6; i < 0x15; i++)
> +				dmi_reserved_uint8_check(fw, table, addr, "Reserved", hdr, i);
>  			if (hdr->length < 0x16)
>  				break;
>  			for (i = 1; i <= hdr->data[4]; i++) {
> 
Acked-by: Colin Ian King <colin.king at canonical.com>