62 lines
2.1 KiB
Diff
62 lines
2.1 KiB
Diff
Fix CVE-2018-14647:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14647
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https://bugs.python.org/issue34623
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Taken from upstream:
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https://github.com/python/cpython/commit/18b20bad75b4ff0486940fba4ec680e96e70f3a2
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diff --git a/Include/pyexpat.h b/Include/pyexpat.h
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index 5340ef5fa3..3fc5fa54da 100644
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--- a/Include/pyexpat.h
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+++ b/Include/pyexpat.h
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@@ -3,7 +3,7 @@
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/* note: you must import expat.h before importing this module! */
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-#define PyExpat_CAPI_MAGIC "pyexpat.expat_CAPI 1.0"
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+#define PyExpat_CAPI_MAGIC "pyexpat.expat_CAPI 1.1"
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#define PyExpat_CAPSULE_NAME "pyexpat.expat_CAPI"
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struct PyExpat_CAPI
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@@ -43,6 +43,8 @@ struct PyExpat_CAPI
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XML_Parser parser, XML_UnknownEncodingHandler handler,
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void *encodingHandlerData);
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void (*SetUserData)(XML_Parser parser, void *userData);
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+ /* might be none for expat < 2.1.0 */
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+ int (*SetHashSalt)(XML_Parser parser, unsigned long hash_salt);
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/* always add new stuff to the end! */
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};
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diff --git a/Modules/_elementtree.c b/Modules/_elementtree.c
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index f7f992dd3a..b38e0ab329 100644
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--- a/Modules/_elementtree.c
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+++ b/Modules/_elementtree.c
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@@ -2574,6 +2574,11 @@ xmlparser(PyObject* self_, PyObject* args, PyObject* kw)
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PyErr_NoMemory();
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return NULL;
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}
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+ /* expat < 2.1.0 has no XML_SetHashSalt() */
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+ if (EXPAT(SetHashSalt) != NULL) {
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+ EXPAT(SetHashSalt)(self->parser,
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+ (unsigned long)_Py_HashSecret.prefix);
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+ }
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ALLOC(sizeof(XMLParserObject), "create expatparser");
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diff --git a/Modules/pyexpat.c b/Modules/pyexpat.c
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index 2b4d31293c..1f8c0d70a5 100644
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--- a/Modules/pyexpat.c
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+++ b/Modules/pyexpat.c
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@@ -2042,6 +2042,11 @@ MODULE_INITFUNC(void)
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capi.SetProcessingInstructionHandler = XML_SetProcessingInstructionHandler;
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capi.SetUnknownEncodingHandler = XML_SetUnknownEncodingHandler;
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capi.SetUserData = XML_SetUserData;
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+#if XML_COMBINED_VERSION >= 20100
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+ capi.SetHashSalt = XML_SetHashSalt;
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+#else
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+ capi.SetHashSalt = NULL;
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+#endif
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/* export using capsule */
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capi_object = PyCapsule_New(&capi, PyExpat_CAPSULE_NAME, NULL);
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