png.pl: make payload chunk as critical to prevent stripping

sighook · Dec 20, 2019 · facd742 · facd742
1 parent ebf19ab
commit facd742
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/png.pl b/png.pl
@@ -129,8 +129,8 @@ sub inject_payload {
     # chunk size
     syswrite $fh, (pack 'I>', length $payload);
 
-    # chunk name: pUnk
-    syswrite $fh, "\x70\x55\x6e\x6b";
+    # chunk name: PUnK (critical)
+    syswrite $fh, "\x50\x55\x6e\x4b";
 
     syswrite $fh, $payload;