Trent Mick <trentm@activestate.com>:

This patch fixes possible overflow in the use of
PyOS_GetLastModificationTime in getmtime.c and Python/import.c.

Currently PyOS_GetLastModificationTime returns a C long. This can
overflow on Win64 where sizeof(time_t) > sizeof(long). Besides it
should logically return a time_t anyway (this patch changes this).

As well, import.c uses PyOS_GetLastModificationTime for .pyc
timestamping.  There has been recent discussion about the .pyc header
format on python-dev.  This patch adds oveflow checking to import.c so
that an exception will be raised if the modification time
overflows. There are a few other minor 64-bit readiness changes made
to the module as well:

- size_t instead of int or long for function-local buffer and string
length variables

- one buffer overflow check was added (raises an exception on possible
overflow, this overflow chance exists on 32-bit platforms as well), no
other possible buffer overflows existed (from my analysis anyway)

Closes SourceForge patch #100509.

Python/getmtime.c

@@ -33,13 +33,14 @@ PERFORMANCE OF THIS SOFTWARE.
 
 /* (A separate file because this may be OS dependent) */
 
+#include "Python.h"
 #include "config.h"
 
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
-long
+time_t
 PyOS_GetLastModificationTime(path, fp)
 	char *path;
 	FILE *fp;