DTBO

BootSignature.java

boot_signer/src/main/java/BootSignature.java

@@ -72,6 +72,11 @@ public class BootSignature extends ASN1Object
     private PublicKey               publicKey;
 
     private static final int FORMAT_VERSION = 1;
+    /**
+     * Offset of recovery DTBO length in a boot image header of version greater than
+     * or equal to 1.
+     */
+    private static final int BOOT_IMAGE_HEADER_V1_RECOVERY_DTBO_SIZE_OFFSET = 1632;
 
     /**
      * Initializes the object for signing an image file
@@ -209,6 +214,22 @@ public class BootSignature extends ASN1Object
                 + ((ramdskSize + pageSize - 1) / pageSize) * pageSize
                 + ((secondSize + pageSize - 1) / pageSize) * pageSize;
 
+        int headerVersion = image.getInt(); // boot image header version
+        if (headerVersion > 0) {
+            image.position(BOOT_IMAGE_HEADER_V1_RECOVERY_DTBO_SIZE_OFFSET);
+            int recoveryDtboLength = image.getInt();
+            length += ((recoveryDtboLength + pageSize - 1) / pageSize) * pageSize;
+
+            image.getLong(); // recovery_dtbo address
+            if (headerVersion == 1) {
+                int headerSize = image.getInt();
+                if (image.position() != headerSize) {
+                    throw new IllegalArgumentException(
+                            "Invalid image header: invalid header length");
+                }
+            }
+        }
+
         length = ((length + pageSize - 1) / pageSize) * pageSize;
 
         if (length <= 0) {