[U-Boot] [PATCH 11/16] efi_loader: set up secure boot

AKASHI Takahiro
2019-11-13T00:53:01Z

The following variable is exported as UEFI specification defines:
SignatureSupport: array of GUIDs representing the type of signatures
supported by the platform firmware

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
---
lib/efi_loader/efi_setup.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)

diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index de7b616c6daa..50cef1b4dfde 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -82,6 +82,39 @@ out:
return ret;
}

+#ifdef CONFIG_EFI_SECURE_BOOT
+/**
+ * efi_init_secure_boot - initialize secure boot state
+ *
+ * Return: EFI_SUCCESS on success, status code (negative) on error
+ */
+static efi_status_t efi_init_secure_boot(void)
+{
+ efi_guid_t signature_types[] = {
+ EFI_CERT_SHA256_GUID,
+ EFI_CERT_X509_GUID,
+ };
+ efi_status_t ret;
+
+ /* TODO: read-only */
+ ret = EFI_CALL(efi_set_variable(L"SignatureSupport",
+ &efi_global_variable_guid,
+ EFI_VARIABLE_BOOTSERVICE_ACCESS
+ | EFI_VARIABLE_RUNTIME_ACCESS,
+ sizeof(signature_types),
+ &signature_types));
+ if (ret != EFI_SUCCESS)
+ printf("EFI: cannot initialize SignatureSupport variable\n");
+
+ return ret;
+}
+#else
+static efi_status_t efi_init_secure_boot(void)
+{
+ return EFI_SUCCESS;
+}
+#endif /* CONFIG_EFI_SECURE_BOOT */
+
/**
* efi_init_obj_list() - Initialize and populate EFI object list
*
@@ -122,6 +155,11 @@ efi_status_t efi_init_obj_list(void)
if (ret != EFI_SUCCESS)
goto out;

+ /* Secure boot */
+ ret = efi_init_secure_boot();
+ if (ret != EFI_SUCCESS)
+ goto out;
+
/* Indicate supported runtime services */
ret = efi_init_runtime_supported();
if (ret != EFI_SUCCESS)
--
2.21.0