1 files changed, 129 insertions, 0 deletions

diff --git a/meta/recipes-core/expat/expat/CVE-2022-25236.patch b/meta/recipes-core/expat/expat/CVE-2022-25236.patch
new file mode 100644
index 0000000000..ba6443fc6a
--- /dev/null
+++ b/meta/recipes-core/expat/expat/CVE-2022-25236.patch
@@ -0,0 +1,129 @@
+From 6881a4fc8596307ab9ff2e85e605afa2e413ab71 Mon Sep 17 00:00:00 2001
+From: Sebastian Pipping <sebastian@pipping.org>
+Date: Sat, 12 Feb 2022 00:19:13 +0100
+Subject: [PATCH] lib: Fix (harmless) use of uninitialized memory
+
+Upstream-Status: Backport
+https://github.com/libexpat/libexpat/pull/561/commits
+
+CVE: CVE-2022-25236
+
+Signed-off-by: Steve Sakoman <steve@sakoman.com>
+
+---
+ expat/lib/xmlparse.c | 6 ++----
+ 1 file changed, 2 insertions(+), 4 deletions(-)
+
+diff --git a/lib/xmlparse.c b/lib/xmlparse.c
+index 902895d5..c768f856 100644
+--- a/lib/xmlparse.c
++++ b/lib/xmlparse.c
+@@ -718,8 +718,7 @@ XML_ParserCreate(const XML_Char *encodingName) {
+ 
+ XML_Parser XMLCALL
+ XML_ParserCreateNS(const XML_Char *encodingName, XML_Char nsSep) {
+-  XML_Char tmp[2];
+-  *tmp = nsSep;
++  XML_Char tmp[2] = {nsSep, 0};
+   return XML_ParserCreate_MM(encodingName, NULL, tmp);
+ }
+ 
+@@ -1344,8 +1343,7 @@ XML_ExternalEntityParserCreate(XML_Parser oldParser, const XML_Char *context,
+      would be otherwise.
+   */
+   if (parser->m_ns) {
+-    XML_Char tmp[2];
+-    *tmp = parser->m_namespaceSeparator;
++    XML_Char tmp[2] = {parser->m_namespaceSeparator, 0};
+     parser = parserCreate(encodingName, &parser->m_mem, tmp, newDtd);
+   } else {
+     parser = parserCreate(encodingName, &parser->m_mem, NULL, newDtd);
+From a2fe525e660badd64b6c557c2b1ec26ddc07f6e4 Mon Sep 17 00:00:00 2001
+From: Sebastian Pipping <sebastian@pipping.org>
+Date: Sat, 12 Feb 2022 01:09:29 +0100
+Subject: [PATCH] lib: Protect against malicious namespace declarations
+ (CVE-2022-25236)
+
+---
+ expat/lib/xmlparse.c | 11 +++++++++++
+ 1 file changed, 11 insertions(+)
+
+diff --git a/lib/xmlparse.c b/lib/xmlparse.c
+index c768f856..a3aef88c 100644
+--- a/lib/xmlparse.c
++++ b/lib/xmlparse.c
+@@ -3754,6 +3754,17 @@ addBinding(XML_Parser parser, PREFIX *prefix, const ATTRIBUTE_ID *attId,
+     if (! mustBeXML && isXMLNS
+         && (len > xmlnsLen || uri[len] != xmlnsNamespace[len]))
+       isXMLNS = XML_FALSE;
++
++    // NOTE: While Expat does not validate namespace URIs against RFC 3986,
++    //       we have to at least make sure that the XML processor on top of
++    //       Expat (that is splitting tag names by namespace separator into
++    //       2- or 3-tuples (uri-local or uri-local-prefix)) cannot be confused
++    //       by an attacker putting additional namespace separator characters
++    //       into namespace declarations.  That would be ambiguous and not to
++    //       be expected.
++    if (parser->m_ns && (uri[len] == parser->m_namespaceSeparator)) {
++      return XML_ERROR_SYNTAX;
++    }
+   }
+   isXML = isXML && len == xmlLen;
+   isXMLNS = isXMLNS && len == xmlnsLen;
+From 2de077423fb22750ebea599677d523b53cb93b1d Mon Sep 17 00:00:00 2001
+From: Sebastian Pipping <sebastian@pipping.org>
+Date: Sat, 12 Feb 2022 00:51:43 +0100
+Subject: [PATCH] tests: Cover CVE-2022-25236
+
+---
+ expat/tests/runtests.c | 30 ++++++++++++++++++++++++++++++
+ 1 file changed, 30 insertions(+)
+
+diff --git a/tests/runtests.c b/tests/runtests.c
+index d07203f2..bc5344b1 100644
+--- a/tests/runtests.c
++++ b/tests/runtests.c
+@@ -7220,6 +7220,35 @@ START_TEST(test_ns_double_colon_doctype) {
+ }
+ END_TEST
+ 
++START_TEST(test_ns_separator_in_uri) {
++  struct test_case {
++    enum XML_Status expectedStatus;
++    const char *doc;
++  };
++  struct test_case cases[] = {
++      {XML_STATUS_OK, "<doc xmlns='one_two' />"},
++      {XML_STATUS_ERROR, "<doc xmlns='one&#x0A;two' />"},
++  };
++
++  size_t i = 0;
++  size_t failCount = 0;
++  for (; i < sizeof(cases) / sizeof(cases[0]); i++) {
++    XML_Parser parser = XML_ParserCreateNS(NULL, '\n');
++    XML_SetElementHandler(parser, dummy_start_element, dummy_end_element);
++    if (XML_Parse(parser, cases[i].doc, (int)strlen(cases[i].doc),
++                  /*isFinal*/ XML_TRUE)
++        != cases[i].expectedStatus) {
++      failCount++;
++    }
++    XML_ParserFree(parser);
++  }
++
++  if (failCount) {
++    fail("Namespace separator handling is broken");
++  }
++}
++END_TEST
++
+ /* Control variable; the number of times duff_allocator() will successfully
+  * allocate */
+ #define ALLOC_ALWAYS_SUCCEED (-1)
+@@ -11905,6 +11934,7 @@ make_suite(void) {
+   tcase_add_test(tc_namespace, test_ns_utf16_doctype);
+   tcase_add_test(tc_namespace, test_ns_invalid_doctype);
+   tcase_add_test(tc_namespace, test_ns_double_colon_doctype);
++  tcase_add_test(tc_namespace, test_ns_separator_in_uri);
+ 
+   suite_add_tcase(s, tc_misc);
+   tcase_add_checked_fixture(tc_misc, NULL, basic_teardown);