File expat-CVE-2023-52425-fix-tests.patch of Package expat

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File expat-CVE-2023-52425-fix-tests.patch of Package expat

From: Simon Lees <sflees@suse.de>
Date: Fri, Mar 1 10:42:13
Subject: CVE-2023-52425 Tests and Test suite fixes

This adds the Tests for CVE-2023-52425 to the testsuite and addresses
other changes required for the other tests to pass with the other
internal changes.

---
Index: expat-2.4.4/tests/runtests.c
===================================================================
--- expat-2.4.4.orig/tests/runtests.c
+++ expat-2.4.4/tests/runtests.c
@@ -52,8 +52,42 @@
 # endif /* XML_UNICODE */
 #endif /* XML_UNICODE_WCHAR_T */
 
+struct handler_record_entry {
+  const char *name;
+  int arg;
+};
+struct handler_record_list {
+  int count;
+  struct handler_record_entry entries[50]; // arbitrary big-enough max count
+};
+
+extern const struct handler_record_entry *
+_handler_record_get(const struct handler_record_list *storage, int index,
+                    const char *file, int line);
+
+#  define handler_record_get(storage, index)                                   \
+    _handler_record_get((storage), (index), __FILE__, __LINE__)
+
+#  define assert_record_handler_called(storage, index, expected_name,          \
+                                       expected_arg)                           \
+    do {                                                                       \
+      const struct handler_record_entry *e                                     \
+          = handler_record_get(storage, index);                                \
+      assert_true(strcmp(e->name, expected_name) == 0);                        \
+      assert_true(e->arg == (expected_arg));                                   \
+    } while (0)
+
+const struct handler_record_entry *
+_handler_record_get(const struct handler_record_list *storage, int index,
+                    const char *file, int line) {
+  if (storage->count <= index) {
+    _fail(file, line, "too few handler calls");
+  }
+  return &storage->entries[index];
+}

static XML_Parser parser;
+static int g_chunkSize = 1;
 
 static void
 tcase_add_test__ifdef_xml_dtd(TCase *tc, tcase_test_function test) {
@@ -100,6 +134,27 @@ _xml_failure(XML_Parser parser, const ch
             file, line);
     _fail_unless(0, file, line, buffer);
 }
+
+static enum XML_Status
+_XML_Parse_SINGLE_BYTES(XML_Parser parser, const char *s, int len,
+                         int isFinal) {
+  // This ensures that tests have to run pathological parse cases
+  // (e.g. when `s` is NULL) against plain XML_Parse rather than
+  // chunking _XML_Parse_SINGLE_BYTES.
+  assert((parser != NULL) && (s != NULL) && (len >= 0));
+  const int chunksize = g_chunkSize;
+  if (chunksize > 0) {
+    // parse in chunks of `chunksize` bytes as long as not exhausting
+    for (; len > chunksize; len -= chunksize, s += chunksize) {
+      enum XML_Status res = XML_Parse(parser, s, chunksize, XML_FALSE);
+      if (res != XML_STATUS_OK) {
+        return res;
+      }
+    }
+  }
+  // parse the final chunk, the size of which will be <= chunksize
+  return XML_Parse(parser, s, len, isFinal);
+}
 
 #define xml_failure(parser) _xml_failure((parser), __FILE__, __LINE__)
 
@@ -551,7 +606,8 @@ START_TEST(test_line_number_after_parse)
         "\n</tag>";
     XML_Size lineno;
 
-    if (XML_Parse(parser, text, strlen(text), XML_FALSE) == XML_STATUS_ERROR)
+    if (_XML_Parse_SINGLE_BYTES(parser, text, (int)strlen(text), XML_TRUE)
+       == XML_STATUS_ERROR)
         xml_failure(parser);
     lineno = XML_GetCurrentLineNumber(parser);
     if (lineno != 4) {
@@ -569,7 +625,8 @@ START_TEST(test_column_number_after_pars
     char *text = "<tag></tag>";
     XML_Size colno;
 
-    if (XML_Parse(parser, text, strlen(text), XML_FALSE) == XML_STATUS_ERROR)
+    if (_XML_Parse_SINGLE_BYTES(parser, text, (int)strlen(text), XML_TRUE)
+      == XML_STATUS_ERROR)
         xml_failure(parser);
     colno = XML_GetCurrentColumnNumber(parser);
     if (colno != 11) {
@@ -654,7 +711,8 @@ START_TEST(test_line_number_after_error)
         "  <b>\n"
         "  </a>";  /* missing </b> */
     XML_Size lineno;
-    if (XML_Parse(parser, text, strlen(text), XML_FALSE) != XML_STATUS_ERROR)
+    if (_XML_Parse_SINGLE_BYTES(parser, text, (int)strlen(text), XML_TRUE)
+       != XML_STATUS_ERROR)
         fail("Expected a parse error");
 
     lineno = XML_GetCurrentLineNumber(parser);
@@ -674,7 +732,8 @@ START_TEST(test_column_number_after_erro
         "  <b>\n"
         "  </a>";  /* missing </b> */
     XML_Size colno;
-    if (XML_Parse(parser, text, strlen(text), XML_FALSE) != XML_STATUS_ERROR)
+    if (_XML_Parse_SINGLE_BYTES(parser, text, (int)strlen(text), XML_TRUE)
+       != XML_STATUS_ERROR)
         fail("Expected a parse error");
 
     colno = XML_GetCurrentColumnNumber(parser);

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