bpo-29591: Upgrade Modules/expat to libexpat 2.2 (#2164)

* bpo-29591: Upgrade Modules/expat to libexpat 2.2 * bpo-29591: Restore Python changes on expat * bpo-29591: Remove expat config of unsupported platforms Remove the configuration (Modules/expat/*config.h) of unsupported platforms: * Amiga * MacOS Classic on PPC32 * Open Watcom * bpo-29591: Remove useless XML_HAS_SET_HASH_SALT The XML_HAS_SET_HASH_SALT define of Modules/expat/expat.h became useless since our local expat copy was upgrade to expat 2.1 (it's now expat 2.2.0). (cherry picked from commit 23ec4b5)
python · larryhastings · Jul 12, 2017 · Jun 14, 2017 · Jun 21, 2017 · Jun 23, 2017
commit 6b48237f4e275f3ae2c75db2b83a29ddf6eab740
diff --git a/Misc/NEWS.d/next/Security/2017-07-11-22-26-48.bpo-29591.cOeMX-.rst b/Misc/NEWS.d/next/Security/2017-07-11-22-26-48.bpo-29591.cOeMX-.rst
@@ -0,0 +1,3 @@
+Update expat copy from 2.1.1 to 2.2.0 to get fixes of CVE-2016-0718 and
+CVE-2016-4472. See https://sourceforge.net/p/expat/bugs/537/ for more
+information.
diff --git a/Modules/expat/COPYING b/Modules/expat/COPYING
@@ -1,6 +1,5 @@
-Copyright (c) 1998, 1999, 2000 Thai Open Source Software Center Ltd
-                               and Clark Cooper
-Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006 Expat maintainers.
+Copyright (c) 1998-2000 Thai Open Source Software Center Ltd and Clark Cooper
+Copyright (c) 2001-2016 Expat maintainers
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

diff --git a/Modules/expat/amigaconfig.h b/Modules/expat/amigaconfig.h
diff --git a/Modules/expat/expat.h b/Modules/expat/expat.h
@@ -342,7 +342,7 @@ XML_SetEntityDeclHandler(XML_Parser parser,
                          XML_EntityDeclHandler handler);
 
 /* OBSOLETE -- OBSOLETE -- OBSOLETE
-   This handler has been superceded by the EntityDeclHandler above.
+   This handler has been superseded by the EntityDeclHandler above.
    It is provided here for backward compatibility.
 
    This is called for a declaration of an unparsed (NDATA) entity.
@@ -915,8 +915,6 @@ XMLPARSEAPI(int)
 XML_SetHashSalt(XML_Parser parser,
                 unsigned long hash_salt);
 
-#define XML_HAS_SET_HASH_SALT  /* Python Only: Defined for pyexpat.c. */
-
 /* If XML_Parse or XML_ParseBuffer have returned XML_STATUS_ERROR, then
    XML_GetErrorCode returns information about the error.
 */
@@ -975,9 +973,12 @@ XML_FreeContentModel(XML_Parser parser, XML_Content *model);
 
 /* Exposing the memory handling functions used in Expat */
 XMLPARSEAPI(void *)
+XML_ATTR_MALLOC
+XML_ATTR_ALLOC_SIZE(2)
 XML_MemMalloc(XML_Parser parser, size_t size);
 
 XMLPARSEAPI(void *)
+XML_ATTR_ALLOC_SIZE(3)
 XML_MemRealloc(XML_Parser parser, void *ptr, size_t size);
 
 XMLPARSEAPI(void)
@@ -1033,14 +1034,12 @@ XMLPARSEAPI(const XML_Feature *)
 XML_GetFeatureList(void);
 
 
-/* Expat follows the GNU/Linux convention of odd number minor version for
-   beta/development releases and even number minor version for stable
-   releases. Micro is bumped with each release, and set to 0 with each
-   change to major or minor version.
+/* Expat follows the semantic versioning convention.
+   See http://semver.org.
 */
 #define XML_MAJOR_VERSION 2
-#define XML_MINOR_VERSION 1
-#define XML_MICRO_VERSION 1
+#define XML_MINOR_VERSION 2
+#define XML_MICRO_VERSION 0
 
 #ifdef __cplusplus
 }

diff --git a/Modules/expat/expat_external.h b/Modules/expat/expat_external.h
@@ -69,12 +69,26 @@
 #endif
 #endif  /* not defined XML_STATIC */
 
+#if !defined(XMLIMPORT) && defined(__GNUC__) && (__GNUC__ >= 4)
+#define XMLIMPORT __attribute__ ((visibility ("default")))
+#endif
 
 /* If we didn't define it above, define it away: */
 #ifndef XMLIMPORT
 #define XMLIMPORT
 #endif
 
+#if defined(__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96))
+#define XML_ATTR_MALLOC __attribute__((__malloc__))
+#else
+#define XML_ATTR_MALLOC
+#endif
+
+#if defined(__GNUC__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
+#define XML_ATTR_ALLOC_SIZE(x)  __attribute__((__alloc_size__(x)))
+#else
+#define XML_ATTR_ALLOC_SIZE(x)
+#endif
 
 #define XMLPARSEAPI(type) XMLIMPORT type XMLCALL
 

diff --git a/Modules/expat/internal.h b/Modules/expat/internal.h
@@ -71,3 +71,25 @@
 #define inline
 #endif
 #endif
+
+#ifndef UNUSED_P
+# ifdef __GNUC__
+#  define UNUSED_P(p) UNUSED_ ## p __attribute__((__unused__))
+# else
+#  define UNUSED_P(p) UNUSED_ ## p
+# endif
+#endif
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+void
+align_limit_to_full_utf8_characters(const char * from, const char ** fromLimRef);
+
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/Modules/expat/macconfig.h b/Modules/expat/macconfig.h
diff --git a/Modules/expat/watcomconfig.h b/Modules/expat/watcomconfig.h