[PATCH 1/2] lib: fwts_uefi: add the function to check the efivars interface existence

[Matt Fleming]

On Fri, 17 May, at 06:15:04PM, IvanHu wrote:
> Actually , I found that checking the secure boot variables db and
> kek via the vars interface will fail.
> using hexdump and cat for these variables also failed,
> u at u-HP-Pavilion-m4-Notebook-PC:/sys/firmware$ sudo hexdump
> efi/vars/db-d719b2cb-3d3a-4596-a3bc-dad00e67656f/data hexdump:
> efi/vars/db-d719b2cb-3d3a-4596-a3bc-dad00e67656f/data: Input/output
> error
> ,but efivars works fine. That's why I add the patches to specify
> using efivars interface for running the securebootcert test to avoid
> the unintentional fail from using vars interface.

The issue you may be running into here is that the old EFI variable
sysfs interface cannot handle variables that are larger than 1024 bytes.
This is in fact the reason that the efivarfs file system was created -
to address this limitation.

-- 
Matt Fleming, Intel Open Source Technology Center