[GRUB PATCH RFC 11/22] efi: Add a function to read EFI variables with attributes

[Krystian Hebel <krystian.hebel@3mdeb.com>]

From: Norbert Kaminski <norbert.kaminski@3mdeb.com>

It will be used to properly detect and report UEFI Secure Boot status to
the x86 Linux kernel. The functionality will be added by subsequent patches.

Signed-off-by: Ignat Korchagin <ignat@cloudflare.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Norbert Kaminski <norbert.kaminski@3mdeb.com>
---
 grub-core/kern/efi/efi.c | 16 +++++++++++++---
 include/grub/efi/efi.h   |  5 +++++
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
index 9403b12cd780..2942b8e355de 100644
--- a/grub-core/kern/efi/efi.c
+++ b/grub-core/kern/efi/efi.c
@@ -224,8 +224,11 @@ grub_efi_set_variable(const char *var, const grub_efi_guid_t *guid,
 }
 
 grub_efi_status_t
-grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
-		       grub_size_t *datasize_out, void **data_out)
+grub_efi_get_variable_with_attributes (const char *var,
+				       const grub_efi_guid_t *guid,
+				       grub_size_t *datasize_out,
+				       void **data_out,
+				       grub_efi_uint32_t *attributes)
 {
   grub_efi_status_t status;
   grub_efi_uintn_t datasize = 0;
@@ -262,7 +265,7 @@ grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
       return GRUB_EFI_OUT_OF_RESOURCES;
     }
 
-  status = efi_call_5 (r->get_variable, var16, guid, NULL, &datasize, data);
+  status = efi_call_5 (r->get_variable, var16, guid, attributes, &datasize, data);
   grub_free (var16);
 
   if (status == GRUB_EFI_SUCCESS)
@@ -276,6 +279,13 @@ grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
   return status;
 }
 
+grub_efi_status_t
+grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
+		       grub_size_t *datasize_out, void **data_out)
+{
+  return grub_efi_get_variable_with_attributes (var, guid, datasize_out, data_out, NULL);
+}
+
 #pragma GCC diagnostic ignored "-Wcast-align"
 
 /* Search the mods section from the PE32/PE32+ image. This code uses
diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h
index 8b2a0f1f5907..83d958f9945e 100644
--- a/include/grub/efi/efi.h
+++ b/include/grub/efi/efi.h
@@ -74,6 +74,11 @@ grub_err_t EXPORT_FUNC (grub_efi_set_virtual_address_map) (grub_efi_uintn_t memo
 							   grub_efi_uintn_t descriptor_size,
 							   grub_efi_uint32_t descriptor_version,
 							   grub_efi_memory_descriptor_t *virtual_map);
+grub_efi_status_t EXPORT_FUNC (grub_efi_get_variable_with_attributes) (const char *variable,
+								       const grub_efi_guid_t *guid,
+								       grub_size_t *datasize_out,
+								       void **data_out,
+								       grub_efi_uint32_t *attributes);
 grub_efi_status_t EXPORT_FUNC (grub_efi_get_variable) (const char *variable,
 						       const grub_efi_guid_t *guid,
 						       grub_size_t *datasize_out,
-- 
2.17.1