[PATCH v3 10/10] fdt: Add device tree file type

[Alexander Graf]

We now have signature check logic in grub which allows us to treat
files differently depending on their file type.

Mark a loaded device tree as such and treat it like an overlayed ACPI
table. Both describe hardware, so I suppose their threat level is the
same.

Signed-off-by: Alexander Graf <address@hidden>
---
 grub-core/commands/efi/shim_lock.c | 1 +
 grub-core/loader/efi/fdt.c         | 2 +-
 include/grub/file.h                | 2 ++
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/grub-core/commands/efi/shim_lock.c 
b/grub-core/commands/efi/shim_lock.c
index 01246b0fc..90dccb0c7 100644
--- a/grub-core/commands/efi/shim_lock.c
+++ b/grub-core/commands/efi/shim_lock.c
@@ -81,6 +81,7 @@ shim_lock_init (grub_file_t io, enum grub_file_type type,
       /* Fall through. */
 
     case GRUB_FILE_TYPE_ACPI_TABLE:
+    case GRUB_FILE_TYPE_DEVICE_TREE:
       *flags = GRUB_VERIFY_FLAGS_DEFER_AUTH;
 
       return GRUB_ERR_NONE;
diff --git a/grub-core/loader/efi/fdt.c b/grub-core/loader/efi/fdt.c
index a4c6e8036..d8ebe648e 100644
--- a/grub-core/loader/efi/fdt.c
+++ b/grub-core/loader/efi/fdt.c
@@ -123,7 +123,7 @@ grub_cmd_devicetree (grub_command_t cmd __attribute__ 
((unused)),
       return GRUB_ERR_NONE;
     }
 
-  dtb = grub_file_open (argv[0]);
+  dtb = grub_file_open (argv[0], GRUB_FILE_TYPE_DEVICE_TREE);
   if (!dtb)
     goto out;
 
diff --git a/include/grub/file.h b/include/grub/file.h
index 19dda67f6..b8fb13017 100644
--- a/include/grub/file.h
+++ b/include/grub/file.h
@@ -93,6 +93,8 @@ enum grub_file_type
     GRUB_FILE_TYPE_FILE_ID,
     /* File holding ACPI table.  */
     GRUB_FILE_TYPE_ACPI_TABLE,
+    /* File holding Device Tree.  */
+    GRUB_FILE_TYPE_DEVICE_TREE,
     /* File we intend show to user.  */
     GRUB_FILE_TYPE_CAT,
     GRUB_FILE_TYPE_HEXCAT,
-- 
2.12.3