From: Richard W.M. Jones <rjones@redhat.com>
Date: Wed, 11 May 2016 21:06:46 +0000 (+0100)
Subject: scripts/signrom.py: Check for magic in option ROMs.
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=fd28938b7adb33f8af11849cdd0d0b2fb92990e3;p=qemu.git

scripts/signrom.py: Check for magic in option ROMs.

Because of the risk that compilers might not emit the asm() block at
the beginning of the option ROM, check that the ROM contains the
required magic signature.

Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Message-Id: <1463000807-18015-3-git-send-email-rjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/scripts/signrom.py b/scripts/signrom.py
index 6c8b9bf406..5629bca222 100644
--- a/scripts/signrom.py
+++ b/scripts/signrom.py
@@ -17,7 +17,10 @@ if len(sys.argv) < 3:
 fin = open(sys.argv[1], 'rb')
 fout = open(sys.argv[2], 'wb')
 
-fin.seek(2)
+magic = fin.read(2)
+if magic != '\x55\xaa':
+    sys.exit("%s: option ROM does not begin with magic 55 aa" % sys.argv[1])
+
 size_byte = ord(fin.read(1))
 fin.seek(0)