pkg/uefi/meregion: fall back so scanning whole region for FPT

MEAnalyzer does the same thing. There are images where the FPT is not at the beginning of the ME region, e.g.: https://www.gigabyte.com/Motherboard/H410M-H-V3-rev-10-12/support#support-dl-bios Signed-off-by: Daniel Maslowski <[email protected]>
linuxboot · Sep 28, 2024 · 6722304 · 6722304
1 parent 8d9c09a
commit 6722304
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/pkg/uefi/meregion.go b/pkg/uefi/meregion.go
@@ -103,6 +103,11 @@ func FindMEDescriptor(buf []byte) (int, error) {
 		// + 4 since the descriptor starts after the signature
 		return len(MEFPTSignature), nil
 	}
+	fptOffset := bytes.Index(buf, MEFPTSignature)
+	if fptOffset > 0 {
+		fmt.Printf("FPT Signature @ 0x%x\n", fptOffset)
+		return fptOffset + len(MEFPTSignature), nil
+	}
 	return -1, fmt.Errorf("ME Flash Partition Table signature %#02x not found: first 20 bytes are:\n%s", MEFPTSignature, hex.Dump(buf[:20]))
 }