Commit 20ffd920 authored by Dov Murik's avatar Dov Murik Committed by Ard Biesheuvel
Browse files

efi: Register efi_secret platform device if EFI secret area is declared 



During efi initialization, check if coco_secret is defined in the EFI
configuration table; in such case, register platform device
"efi_secret".  This allows udev to automatically load the efi_secret
module (platform driver), which in turn will populate the
<securityfs>/secrets/coco directory in guests into which secrets were
injected.

Note that a declared address of an EFI secret area doesn't mean that
secrets where indeed injected to that area; if the secret area is not
populated, the driver will not load (but the platform device will still
be registered).

Signed-off-by: default avatarDov Murik <dovmurik@linux.ibm.com>
Reviewed-by: default avatarGerd Hoffmann <kraxel@redhat.com>
Link: https://lore.kernel.org/r/20220412212127.154182-4-dovmurik@linux.ibm.com


Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
parent cbabf03c

drivers/firmware/efi/efi.c

+5 −0
Original line number Diff line number Diff line
@@ -425,6 +425,11 @@ static int __init efisubsys_init(void) 
	if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS))

		efi_debugfs_init();



#ifdef CONFIG_EFI_COCO_SECRET

	if (efi.coco_secret != EFI_INVALID_TABLE_ADDR)

		platform_device_register_simple("efi_secret", 0, NULL, 0);

#endif



	return 0;



err_remove_group: