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gh-111178: fix UBSan failures in Modules/pyexpat.c (GH-129789)
Fix UBSan failures for `xmlparseobject`, XML handler setters Suppress unused return values Rewrite `RC_HANDLER` with better semantics
This commit is contained in:
Bénédikt Tran
GitHub
parent
ef29104f7d
commit
c070abadb2
1 changed files with 146 additions and 97 deletions
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@ -92,12 +92,14 @@ typedef struct {
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PyObject **handlers;
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} xmlparseobject;
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#define xmlparseobject_CAST(op) ((xmlparseobject *)(op))
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#include "clinic/pyexpat.c.h"
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#define CHARACTER_DATA_BUFFER_SIZE 8192
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typedef void (*xmlhandlersetter)(XML_Parser self, void *meth);
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typedef void* xmlhandler;
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typedef const void *xmlhandler;
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typedef void (*xmlhandlersetter)(XML_Parser self, xmlhandler handler);
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struct HandlerInfo {
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const char *name;
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@ -108,6 +110,12 @@ struct HandlerInfo {
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static struct HandlerInfo handler_info[64];
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#define CALL_XML_HANDLER_SETTER(HANDLER_INFO, XML_PARSER, XML_HANDLER) \
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do { \
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xmlhandlersetter setter = (xmlhandlersetter)(HANDLER_INFO).setter; \
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setter((XML_PARSER), (XML_HANDLER)); \
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} while (0)
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/* Set an integer attribute on the error object; return true on success,
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* false on an exception.
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*/
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@ -312,7 +320,7 @@ flush_character_buffer(xmlparseobject *self)
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static void
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my_CharacterDataHandler(void *userData, const XML_Char *data, int len)
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{
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xmlparseobject *self = (xmlparseobject *) userData;
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xmlparseobject *self = xmlparseobject_CAST(userData);
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if (PyErr_Occurred())
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return;
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@ -345,7 +353,7 @@ static void
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my_StartElementHandler(void *userData,
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const XML_Char *name, const XML_Char *atts[])
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{
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xmlparseobject *self = (xmlparseobject *)userData;
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xmlparseobject *self = xmlparseobject_CAST(userData);
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if (have_handler(self, StartElement)) {
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PyObject *container, *rv, *args;
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@ -430,45 +438,57 @@ my_StartElementHandler(void *userData,
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}
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}
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#define RC_HANDLER(RC, NAME, PARAMS, INIT, PARAM_FORMAT, CONVERSION, \
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RETURN, GETUSERDATA) \
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static RC \
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#define RC_HANDLER(RETURN_TYPE, NAME, PARAMS, \
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INIT, PARSE_FORMAT, CONVERSION, \
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RETURN_VARIABLE, GETUSERDATA) \
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static RETURN_TYPE \
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my_ ## NAME ## Handler PARAMS { \
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xmlparseobject *self = GETUSERDATA; \
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PyObject *args = NULL; \
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PyObject *rv = NULL; \
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INIT \
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\
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if (have_handler(self, NAME)) { \
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if (PyErr_Occurred()) \
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return RETURN; \
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if (flush_character_buffer(self) < 0) \
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return RETURN; \
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args = Py_BuildValue PARAM_FORMAT ;\
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if (!args) { flag_error(self); return RETURN;} \
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if (!have_handler(self, NAME)) { \
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return RETURN_VARIABLE; \
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} \
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if (PyErr_Occurred()) { \
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return RETURN_VARIABLE; \
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} \
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if (flush_character_buffer(self) < 0) { \
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return RETURN_VARIABLE; \
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} \
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PyObject *args = Py_BuildValue PARSE_FORMAT; \
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if (args == NULL) { \
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flag_error(self); \
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return RETURN_VARIABLE; \
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} \
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self->in_callback = 1; \
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rv = call_with_frame(#NAME,__LINE__, \
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PyObject *rv = call_with_frame( \
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#NAME, __LINE__, \
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self->handlers[NAME], args, self); \
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self->in_callback = 0; \
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Py_DECREF(args); \
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if (rv == NULL) { \
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flag_error(self); \
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return RETURN; \
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return RETURN_VARIABLE; \
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} \
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CONVERSION \
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Py_DECREF(rv); \
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} \
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return RETURN; \
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return RETURN_VARIABLE; \
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}
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#define VOID_HANDLER(NAME, PARAMS, PARAM_FORMAT) \
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RC_HANDLER(void, NAME, PARAMS, ;, PARAM_FORMAT, ;, ;,\
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(xmlparseobject *)userData)
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RC_HANDLER( \
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void, NAME, PARAMS, \
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/* no init */, PARAM_FORMAT, \
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/* no conversion */, /* no return var */, \
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xmlparseobject_CAST(userData) \
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)
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#define INT_HANDLER(NAME, PARAMS, PARAM_FORMAT) \
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RC_HANDLER(int, NAME, PARAMS, int rc=0;, PARAM_FORMAT, \
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RC_HANDLER( \
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int, NAME, PARAMS, \
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int rc = 0;, PARAM_FORMAT, \
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rc = PyLong_AsLong(rv);, rc, \
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(xmlparseobject *)userData)
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xmlparseobject_CAST(userData) \
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)
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VOID_HANDLER(EndElement,
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(void *userData, const XML_Char *name),
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@ -549,7 +569,7 @@ my_ElementDeclHandler(void *userData,
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const XML_Char *name,
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XML_Content *model)
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{
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xmlparseobject *self = (xmlparseobject *)userData;
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xmlparseobject *self = xmlparseobject_CAST(userData);
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PyObject *args = NULL;
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if (have_handler(self, ElementDecl)) {
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@ -979,8 +999,6 @@ pyexpat_xmlparser_ExternalEntityParserCreate_impl(xmlparseobject *self,
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/*[clinic end generated code: output=01d4472b49cb3f92 input=ec70c6b9e6e9619a]*/
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{
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xmlparseobject *new_parser;
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int i;
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pyexpat_state *state = PyType_GetModuleState(cls);
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new_parser = PyObject_GC_New(xmlparseobject, state->xml_parse_type);
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@ -1015,6 +1033,7 @@ pyexpat_xmlparser_ExternalEntityParserCreate_impl(xmlparseobject *self,
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XML_SetUserData(new_parser->itself, (void *)new_parser);
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/* allocate and clear handlers first */
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size_t i;
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for (i = 0; handler_info[i].name != NULL; i++)
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/* do nothing */;
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@ -1026,12 +1045,12 @@ pyexpat_xmlparser_ExternalEntityParserCreate_impl(xmlparseobject *self,
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clear_handlers(new_parser, 1);
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/* then copy handlers from self */
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for (i = 0; handler_info[i].name != NULL; i++) {
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for (size_t i = 0; handler_info[i].name != NULL; i++) {
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PyObject *handler = self->handlers[i];
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if (handler != NULL) {
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new_parser->handlers[i] = Py_NewRef(handler);
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handler_info[i].setter(new_parser->itself,
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handler_info[i].handler);
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struct HandlerInfo info = handler_info[i];
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CALL_XML_HANDLER_SETTER(info, new_parser->itself, info.handler);
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}
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}
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@ -1240,30 +1259,34 @@ newxmlparseobject(pyexpat_state *state, const char *encoding,
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}
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static int
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xmlparse_traverse(xmlparseobject *op, visitproc visit, void *arg)
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xmlparse_traverse(PyObject *op, visitproc visit, void *arg)
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{
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for (int i = 0; handler_info[i].name != NULL; i++) {
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Py_VISIT(op->handlers[i]);
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xmlparseobject *self = xmlparseobject_CAST(op);
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for (size_t i = 0; handler_info[i].name != NULL; i++) {
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Py_VISIT(self->handlers[i]);
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}
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Py_VISIT(Py_TYPE(op));
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return 0;
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}
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static int
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xmlparse_clear(xmlparseobject *op)
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xmlparse_clear(PyObject *op)
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{
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clear_handlers(op, 0);
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Py_CLEAR(op->intern);
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xmlparseobject *self = xmlparseobject_CAST(op);
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clear_handlers(self, 0);
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Py_CLEAR(self->intern);
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return 0;
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}
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static void
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xmlparse_dealloc(xmlparseobject *self)
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xmlparse_dealloc(PyObject *op)
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{
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xmlparseobject *self = xmlparseobject_CAST(op);
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PyObject_GC_UnTrack(self);
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(void)xmlparse_clear(self);
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if (self->itself != NULL)
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(void)xmlparse_clear(op);
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if (self->itself != NULL) {
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XML_ParserFree(self->itself);
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}
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self->itself = NULL;
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if (self->handlers != NULL) {
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@ -1281,19 +1304,24 @@ xmlparse_dealloc(xmlparseobject *self)
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static PyObject *
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xmlparse_handler_getter(xmlparseobject *self, struct HandlerInfo *hi)
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xmlparse_handler_getter(PyObject *op, void *closure)
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{
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xmlparseobject *self = xmlparseobject_CAST(op);
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struct HandlerInfo *hi = (struct HandlerInfo *)closure;
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assert((hi - handler_info) < (Py_ssize_t)Py_ARRAY_LENGTH(handler_info));
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int handlernum = (int)(hi - handler_info);
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PyObject *result = self->handlers[handlernum];
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if (result == NULL)
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if (result == NULL) {
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result = Py_None;
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}
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return Py_NewRef(result);
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}
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static int
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xmlparse_handler_setter(xmlparseobject *self, PyObject *v, struct HandlerInfo *hi)
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xmlparse_handler_setter(PyObject *op, PyObject *v, void *closure)
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{
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xmlparseobject *self = xmlparseobject_CAST(op);
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struct HandlerInfo *hi = (struct HandlerInfo *)closure;
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assert((hi - handler_info) < (Py_ssize_t)Py_ARRAY_LENGTH(handler_info));
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int handlernum = (int)(hi - handler_info);
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if (v == NULL) {
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@ -1323,8 +1351,9 @@ xmlparse_handler_setter(xmlparseobject *self, PyObject *v, struct HandlerInfo *h
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otherwise would, but that's really an odd case. A more
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elaborate system of handlers and state could remove the
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C handler more effectively. */
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if (handlernum == CharacterData && self->in_callback)
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if (handlernum == CharacterData && self->in_callback) {
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c_handler = noop_character_data_handler;
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}
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v = NULL;
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}
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else if (v != NULL) {
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@ -1332,14 +1361,15 @@ xmlparse_handler_setter(xmlparseobject *self, PyObject *v, struct HandlerInfo *h
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c_handler = handler_info[handlernum].handler;
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}
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Py_XSETREF(self->handlers[handlernum], v);
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handler_info[handlernum].setter(self->itself, c_handler);
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CALL_XML_HANDLER_SETTER(handler_info[handlernum], self->itself, c_handler);
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return 0;
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}
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#define INT_GETTER(name) \
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static PyObject * \
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xmlparse_##name##_getter(xmlparseobject *self, void *closure) \
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xmlparse_##name##_getter(PyObject *op, void *Py_UNUSED(closure)) \
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{ \
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xmlparseobject *self = xmlparseobject_CAST(op); \
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return PyLong_FromLong((long)XML_Get##name(self->itself)); \
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}
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INT_GETTER(ErrorCode)
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@ -1353,21 +1383,24 @@ INT_GETTER(CurrentByteIndex)
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#undef INT_GETTER
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static PyObject *
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xmlparse_buffer_text_getter(xmlparseobject *self, void *closure)
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xmlparse_buffer_text_getter(PyObject *op, void *Py_UNUSED(closure))
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{
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xmlparseobject *self = xmlparseobject_CAST(op);
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return PyBool_FromLong(self->buffer != NULL);
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}
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static int
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xmlparse_buffer_text_setter(xmlparseobject *self, PyObject *v, void *closure)
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xmlparse_buffer_text_setter(PyObject *op, PyObject *v, void *Py_UNUSED(closure))
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{
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xmlparseobject *self = xmlparseobject_CAST(op);
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if (v == NULL) {
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PyErr_SetString(PyExc_RuntimeError, "Cannot delete attribute");
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return -1;
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}
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int b = PyObject_IsTrue(v);
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if (b < 0)
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if (b < 0) {
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return -1;
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}
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if (b) {
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if (self->buffer == NULL) {
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self->buffer = PyMem_Malloc(self->buffer_size);
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@ -1379,8 +1412,9 @@ xmlparse_buffer_text_setter(xmlparseobject *self, PyObject *v, void *closure)
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}
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}
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else if (self->buffer != NULL) {
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if (flush_character_buffer(self) < 0)
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if (flush_character_buffer(self) < 0) {
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return -1;
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}
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PyMem_Free(self->buffer);
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self->buffer = NULL;
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}
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@ -1388,14 +1422,16 @@ xmlparse_buffer_text_setter(xmlparseobject *self, PyObject *v, void *closure)
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}
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static PyObject *
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xmlparse_buffer_size_getter(xmlparseobject *self, void *closure)
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xmlparse_buffer_size_getter(PyObject *op, void *Py_UNUSED(closure))
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{
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return PyLong_FromLong((long) self->buffer_size);
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xmlparseobject *self = xmlparseobject_CAST(op);
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return PyLong_FromLong(self->buffer_size);
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}
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static int
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xmlparse_buffer_size_setter(xmlparseobject *self, PyObject *v, void *closure)
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xmlparse_buffer_size_setter(PyObject *op, PyObject *v, void *Py_UNUSED(closure))
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{
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xmlparseobject *self = xmlparseobject_CAST(op);
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if (v == NULL) {
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PyErr_SetString(PyExc_RuntimeError, "Cannot delete attribute");
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return -1;
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@ -1408,8 +1444,9 @@ xmlparse_buffer_size_setter(xmlparseobject *self, PyObject *v, void *closure)
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new_buffer_size = PyLong_AsLong(v);
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if (new_buffer_size <= 0) {
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if (!PyErr_Occurred())
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if (!PyErr_Occurred()) {
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PyErr_SetString(PyExc_ValueError, "buffer_size must be greater than zero");
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}
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return -1;
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}
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@ -1444,68 +1481,78 @@ xmlparse_buffer_size_setter(xmlparseobject *self, PyObject *v, void *closure)
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}
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static PyObject *
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xmlparse_buffer_used_getter(xmlparseobject *self, void *closure)
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xmlparse_buffer_used_getter(PyObject *op, void *Py_UNUSED(closure))
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{
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return PyLong_FromLong((long) self->buffer_used);
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xmlparseobject *self = xmlparseobject_CAST(op);
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return PyLong_FromLong(self->buffer_used);
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}
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static PyObject *
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xmlparse_namespace_prefixes_getter(xmlparseobject *self, void *closure)
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xmlparse_namespace_prefixes_getter(PyObject *op, void *Py_UNUSED(closure))
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{
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xmlparseobject *self = xmlparseobject_CAST(op);
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return PyBool_FromLong(self->ns_prefixes);
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}
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static int
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xmlparse_namespace_prefixes_setter(xmlparseobject *self, PyObject *v, void *closure)
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xmlparse_namespace_prefixes_setter(PyObject *op, PyObject *v, void *Py_UNUSED(closure))
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{
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xmlparseobject *self = xmlparseobject_CAST(op);
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if (v == NULL) {
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PyErr_SetString(PyExc_RuntimeError, "Cannot delete attribute");
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return -1;
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}
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int b = PyObject_IsTrue(v);
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if (b < 0)
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if (b < 0) {
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return -1;
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}
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self->ns_prefixes = b;
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XML_SetReturnNSTriplet(self->itself, self->ns_prefixes);
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return 0;
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}
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static PyObject *
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xmlparse_ordered_attributes_getter(xmlparseobject *self, void *closure)
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xmlparse_ordered_attributes_getter(PyObject *op, void *Py_UNUSED(closure))
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{
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xmlparseobject *self = xmlparseobject_CAST(op);
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return PyBool_FromLong(self->ordered_attributes);
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}
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static int
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xmlparse_ordered_attributes_setter(xmlparseobject *self, PyObject *v, void *closure)
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xmlparse_ordered_attributes_setter(PyObject *op, PyObject *v, void *Py_UNUSED(closure))
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{
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xmlparseobject *self = xmlparseobject_CAST(op);
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if (v == NULL) {
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PyErr_SetString(PyExc_RuntimeError, "Cannot delete attribute");
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return -1;
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}
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int b = PyObject_IsTrue(v);
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if (b < 0)
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if (b < 0) {
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return -1;
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}
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self->ordered_attributes = b;
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return 0;
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}
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static PyObject *
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xmlparse_specified_attributes_getter(xmlparseobject *self, void *closure)
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xmlparse_specified_attributes_getter(PyObject *op, void *Py_UNUSED(closure))
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{
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return PyBool_FromLong((long) self->specified_attributes);
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xmlparseobject *self = xmlparseobject_CAST(op);
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return PyBool_FromLong(self->specified_attributes);
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}
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static int
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xmlparse_specified_attributes_setter(xmlparseobject *self, PyObject *v, void *closure)
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xmlparse_specified_attributes_setter(PyObject *op, PyObject *v, void *Py_UNUSED(closure))
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{
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xmlparseobject *self = xmlparseobject_CAST(op);
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if (v == NULL) {
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PyErr_SetString(PyExc_RuntimeError, "Cannot delete attribute");
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return -1;
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}
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int b = PyObject_IsTrue(v);
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if (b < 0)
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if (b < 0) {
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return -1;
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}
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self->specified_attributes = b;
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return 0;
|
||||
}
|
||||
|
|
@ -1516,10 +1563,10 @@ static PyMemberDef xmlparse_members[] = {
|
|||
};
|
||||
|
||||
#define XMLPARSE_GETTER_DEF(name) \
|
||||
{#name, (getter)xmlparse_##name##_getter, NULL, NULL},
|
||||
{#name, xmlparse_##name##_getter, NULL, NULL},
|
||||
#define XMLPARSE_GETTER_SETTER_DEF(name) \
|
||||
{#name, (getter)xmlparse_##name##_getter, \
|
||||
(setter)xmlparse_##name##_setter, NULL},
|
||||
{#name, xmlparse_##name##_getter, \
|
||||
xmlparse_##name##_setter, NULL},
|
||||
|
||||
static PyGetSetDef xmlparse_getsetlist[] = {
|
||||
XMLPARSE_GETTER_DEF(ErrorCode)
|
||||
|
|
@ -1655,8 +1702,8 @@ static int init_handler_descrs(pyexpat_state *state)
|
|||
for (i = 0; handler_info[i].name != NULL; i++) {
|
||||
struct HandlerInfo *hi = &handler_info[i];
|
||||
hi->getset.name = hi->name;
|
||||
hi->getset.get = (getter)xmlparse_handler_getter;
|
||||
hi->getset.set = (setter)xmlparse_handler_setter;
|
||||
hi->getset.get = xmlparse_handler_getter;
|
||||
hi->getset.set = xmlparse_handler_setter;
|
||||
hi->getset.closure = &handler_info[i];
|
||||
|
||||
PyObject *descr = PyDescr_NewGetSet(state->xml_parse_type, &hi->getset);
|
||||
|
|
@ -2120,7 +2167,7 @@ pyexpat_clear(PyObject *module)
|
|||
static void
|
||||
pyexpat_free(void *module)
|
||||
{
|
||||
pyexpat_clear((PyObject *)module);
|
||||
(void)pyexpat_clear((PyObject *)module);
|
||||
}
|
||||
|
||||
static PyModuleDef_Slot pyexpat_slots[] = {
|
||||
|
|
@ -2151,22 +2198,24 @@ PyInit_pyexpat(void)
|
|||
static void
|
||||
clear_handlers(xmlparseobject *self, int initial)
|
||||
{
|
||||
int i = 0;
|
||||
|
||||
for (; handler_info[i].name != NULL; i++) {
|
||||
if (initial)
|
||||
for (size_t i = 0; handler_info[i].name != NULL; i++) {
|
||||
if (initial) {
|
||||
self->handlers[i] = NULL;
|
||||
}
|
||||
else {
|
||||
Py_CLEAR(self->handlers[i]);
|
||||
handler_info[i].setter(self->itself, NULL);
|
||||
CALL_XML_HANDLER_SETTER(handler_info[i], self->itself, NULL);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static struct HandlerInfo handler_info[] = {
|
||||
|
||||
// The cast to `xmlhandlersetter` is needed as the signature of XML
|
||||
// handler functions is not compatible with `xmlhandlersetter` since
|
||||
// their second parameter is narrower than a `const void *`.
|
||||
#define HANDLER_INFO(name) \
|
||||
{#name, (xmlhandlersetter)XML_Set##name, (xmlhandler)my_##name},
|
||||
{#name, (xmlhandlersetter)XML_Set##name, my_##name},
|
||||
|
||||
HANDLER_INFO(StartElementHandler)
|
||||
HANDLER_INFO(EndElementHandler)
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue