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

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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: Dov Murik <dovmurik@linux.ibm.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://lore.kernel.org/r/20220412212127.154182-4-dovmurik@linux.ibm.com
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Dov Murik 2022-04-12 21:21:26 +00:00 committed by Ard Biesheuvel
parent cbabf03c3e
commit 20ffd9205e
1 changed files with 5 additions and 0 deletions
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5
drivers/firmware/efi/efi.c
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@ -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: