[2.7] bpo-34623: Use XML_SetHashSalt in _elementtree (GH-9146) (GH-9394) · python/cpython@18b20ba (original) (raw)
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- Misc/NEWS.d/next/Security
4 files changed
lines changed
Original file line number | Diff line number | Diff line change |
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@@ -3,7 +3,7 @@ | ||
3 | 3 | |
4 | 4 | /* note: you must import expat.h before importing this module! */ |
5 | 5 | |
6 | -#define PyExpat_CAPI_MAGIC "pyexpat.expat_CAPI 1.0" | |
6 | +#define PyExpat_CAPI_MAGIC "pyexpat.expat_CAPI 1.1" | |
7 | 7 | #define PyExpat_CAPSULE_NAME "pyexpat.expat_CAPI" |
8 | 8 | |
9 | 9 | struct PyExpat_CAPI |
@@ -43,6 +43,8 @@ struct PyExpat_CAPI | ||
43 | 43 | XML_Parser parser, XML_UnknownEncodingHandler handler, |
44 | 44 | void *encodingHandlerData); |
45 | 45 | void (*SetUserData)(XML_Parser parser, void *userData); |
46 | +/* might be none for expat < 2.1.0 */ | |
47 | +int (*SetHashSalt)(XML_Parser parser, unsigned long hash_salt); | |
46 | 48 | /* always add new stuff to the end! */ |
47 | 49 | }; |
48 | 50 |
Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,2 @@ | ||
1 | +The C accelerated _elementtree module now initializes hash randomization | |
2 | +salt from _Py_HashSecret instead of libexpat's default CSPRNG. |
Original file line number | Diff line number | Diff line change |
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@@ -2574,6 +2574,11 @@ xmlparser(PyObject* self_, PyObject* args, PyObject* kw) | ||
2574 | 2574 | PyErr_NoMemory(); |
2575 | 2575 | return NULL; |
2576 | 2576 | } |
2577 | +/* expat < 2.1.0 has no XML_SetHashSalt() */ | |
2578 | +if (EXPAT(SetHashSalt) != NULL) { | |
2579 | +EXPAT(SetHashSalt)(self->parser, | |
2580 | + (unsigned long)_Py_HashSecret.prefix); | |
2581 | + } | |
2577 | 2582 | |
2578 | 2583 | ALLOC(sizeof(XMLParserObject), "create expatparser"); |
2579 | 2584 |
Original file line number | Diff line number | Diff line change |
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@@ -2042,6 +2042,11 @@ MODULE_INITFUNC(void) | ||
2042 | 2042 | capi.SetProcessingInstructionHandler = XML_SetProcessingInstructionHandler; |
2043 | 2043 | capi.SetUnknownEncodingHandler = XML_SetUnknownEncodingHandler; |
2044 | 2044 | capi.SetUserData = XML_SetUserData; |
2045 | +#if XML_COMBINED_VERSION >= 20100 | |
2046 | +capi.SetHashSalt = XML_SetHashSalt; | |
2047 | +#else | |
2048 | +capi.SetHashSalt = NULL; | |
2049 | +#endif | |
2045 | 2050 | |
2046 | 2051 | /* export using capsule */ |
2047 | 2052 | capi_object = PyCapsule_New(&capi, PyExpat_CAPSULE_NAME, NULL); |