Fixed PHP SEGV by not writing to shared memory for zend_class_entry.
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@ -603,10 +603,9 @@ PHP_METHOD(Message, __construct) {
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// will trigger an infinite construction loop and blow the stack. We
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// temporarily clear create_object to break this loop (see check in
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// NameMap_GetMessage()).
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PBPHP_ASSERT(ce->create_object == Message_create);
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ce->create_object = NULL;
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NameMap_EnterConstructor(ce);
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desc = Descriptor_GetFromClassEntry(ce);
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ce->create_object = Message_create;
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NameMap_ExitConstructor(ce);
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if (!desc) {
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zend_throw_exception_ex(
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@ -56,6 +56,9 @@ ZEND_BEGIN_MODULE_GLOBALS(protobuf)
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// Set by the user to make the descriptor pool persist between requests.
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zend_bool keep_descriptor_pool_after_request;
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// Set by the user to make the descriptor pool persist between requests.
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zend_class_entry* constructing_class;
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// A upb_DefPool that we are saving for the next request so that we don't have
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// to rebuild it from scratch. When keep_descriptor_pool_after_request==true,
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// we steal the upb_DefPool from the global DescriptorPool object just before
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@ -173,6 +176,7 @@ static PHP_RINIT_FUNCTION(protobuf) {
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zend_hash_init(&PROTOBUF_G(object_cache), 64, NULL, NULL, 0);
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zend_hash_init(&PROTOBUF_G(descriptors), 64, NULL, ZVAL_PTR_DTOR, 0);
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PROTOBUF_G(constructing_class) = NULL;
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return SUCCESS;
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}
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@ -253,7 +257,7 @@ const upb_MessageDef *NameMap_GetMessage(zend_class_entry *ce) {
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const upb_MessageDef *ret =
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zend_hash_find_ptr(&PROTOBUF_G(name_msg_cache), ce->name);
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if (!ret && ce->create_object) {
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if (!ret && ce->create_object && ce != PROTOBUF_G(constructing_class)) {
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#if PHP_VERSION_ID < 80000
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zval tmp;
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zval zv;
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@ -279,6 +283,16 @@ const upb_EnumDef *NameMap_GetEnum(zend_class_entry *ce) {
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return ret;
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}
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void NameMap_EnterConstructor(zend_class_entry* ce) {
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assert(!PROTOBUF_G(constructing_class));
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PROTOBUF_G(constructing_class) = ce;
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}
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void NameMap_ExitConstructor(zend_class_entry* ce) {
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assert(PROTOBUF_G(constructing_class) == ce);
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PROTOBUF_G(constructing_class) = NULL;
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}
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// -----------------------------------------------------------------------------
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// Module init.
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// -----------------------------------------------------------------------------
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@ -155,6 +155,8 @@ void NameMap_AddMessage(const upb_MessageDef *m);
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void NameMap_AddEnum(const upb_EnumDef *m);
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const upb_MessageDef *NameMap_GetMessage(zend_class_entry *ce);
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const upb_EnumDef *NameMap_GetEnum(zend_class_entry *ce);
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void NameMap_EnterConstructor(zend_class_entry* ce);
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void NameMap_ExitConstructor(zend_class_entry* ce);
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// Add this descriptor object to the global list of descriptors that will be
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// kept alive for the duration of the request but destroyed when the request
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