Merge 3.5 (os.urandom, issue #27278)

Misc/NEWS

@@ -10,6 +10,10 @@ What's New in Python 3.6.0 alpha 3
 Library
 -------
 
+- Issue #27278: Fix os.urandom() implementation using getrandom() on Linux.
+  Truncate size to INT_MAX and loop until we collected enough random bytes,
+  instead of casting a directly Py_ssize_t to int.
+
 - Issue #16864: sqlite3.Cursor.lastrowid now supports REPLACE statement.
   Initial patch by Alex LordThorsen.
 

Python/random.c

@@ -146,7 +146,7 @@ py_getrandom(void *buffer, Py_ssize_t size, int raise)
            to 1024 bytes */
         n = Py_MIN(size, 1024);
 #else
-        n = size;
+        n = Py_MIN(size, INT_MAX);
 #endif
 
         errno = 0;