fix(handler): introduce upper size limit for s_log_block_size

nyuware · nyuware · commit eb1930f5470e · 2024-03-04T12:27:09.000+01:00
The maximum block size limit on a 64bit system is 65536
When creating a fake filesystem with `mkfs.ext4` and setting the block
size to -b 65536, the maximum value that s_log_block_size will reach is six.
diff --git a/unblob/handlers/filesystem/extfs.py b/unblob/handlers/filesystem/extfs.py
@@ -84,6 +84,8 @@ def valid_header(self, header) -> bool:
                 "ExtFS header major version too high", rev_level=header.s_rev_level
             )
             return False
+        if header.s_log_block_size > 6:
+            return False
         return True
 
     def calculate_chunk(self, file: File, start_offset: int) -> Optional[ValidChunk]:

Original file line number	Diff line number	Diff line change
`@@ -84,6 +84,8 @@ def valid_header(self, header) -> bool:`
`84`	`84`	`"ExtFS header major version too high", rev_level=header.s_rev_level`
`85`	`85`	`)`
`86`	`86`	`return False`
	`87`	`+ if header.s_log_block_size > 6:`
	`88`	`+ return False`
`87`	`89`	`return True`
`88`	`90`
`89`	`91`	`def calculate_chunk(self, file: File, start_offset: int) -> Optional[ValidChunk]:`