Add ELF.close() to release resources (Gallopsled#2444)

* Add ELF.close() to release resources

`ELFFile.close()` just closes the mmap'd file, but our own wrapper keeps the file handle open.

This is annoying when using a temporary file on Windows since they can't be deleted if there is
a dangling handle. This can be used together with the inherited context manager from ELFFile.

* Update CHANGELOG

Author: peace-maker

CHANGELOG.md

@@ -74,9 +74,11 @@ The table below shows which release corresponds to each branch, and what date th
 
 - [#2358][2358] Cache output of `asm()`
 - [#2457][2457] Catch exception of non-ELF files in checksec.
+- [#2444][2444] Add `ELF.close()` to release resources
 
 [2358]: https://github.com/Gallopsled/pwntools/pull/2358
 [2457]: https://github.com/Gallopsled/pwntools/pull/2457
+[2444]: https://github.com/Gallopsled/pwntools/pull/2444
 
 ## 4.14.0 (`beta`)
 

pwnlib/elf/elf.py

@@ -364,6 +364,14 @@ def __init__(self, path, checksec=True):
         self._libs = None
         self._maps = None
 
+    def close(self):
+        """close() -> None
+
+        Close the ELF file and release all resources associated with it.
+        """
+        super(ELF, self).close()
+        self.file.close()
+
     @staticmethod
     @LocalContext
     def from_assembly(assembly, *a, **kw):