Merge pull request #674 from onekey-sec/cpio-checksum-fix

fix(cpio): fixed checksum calculation to handle 4 byte overflows
onekey-sec · Nov 11, 2023 · 81929c2 · 81929c2
2 parents c040df9 + f1f18d9
commit 81929c2
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/unblob/handlers/archive/cpio.py b/unblob/handlers/archive/cpio.py
@@ -368,8 +368,7 @@ def valid_checksum(self, header, start_offset: int) -> bool:
 
         for chunk in iterate_file(self.file, start_offset, file_size):
             calculated_checksum += sum(bytearray(chunk))
-
-        return header_checksum == calculated_checksum
+        return header_checksum == calculated_checksum & 0xFF_FF_FF_FF
 
 
 class _CPIOExtractorBase(Extractor):