re PR sanitizer/78307 (missing symbols in libubsan without changing the soname)

	PR sanitizer/78307
	* ubsan/ubsan_handlers.cc (__ubsan_handle_cfi_bad_icall): New function.
	( __ubsan_handle_cfi_bad_icall_abort): Likewise. 
	* ubsan/ubsan_handlers.h (struct CFIBadIcallData): New type.
	* ubsan/ubsan_handlers_cxx.cc (__ubsan_handle_cfi_bad_type): New
	function.
	(__ubsan_handle_cfi_bad_type_abort): Likewise.
	* ubsan/ubsan_handlers_cxx.h (struct CFIBadTypeData): New type.
	(__ubsan_handle_cfi_bad_type): Export function.
	(__ubsan_handle_cfi_bad_type_abort): Likewise.
	* HOWTO_MERGE: Update documentation.

From-SVN: r242478

4 files changed, 54 insertions, 0 deletions

diff --git a/libsanitizer/ubsan/ubsan_handlers.cc b/libsanitizer/ubsan/ubsan_handlers.cc
index 0e343d32307..5631e457a1c 100644
--- a/libsanitizer/ubsan/ubsan_handlers.cc
+++ b/libsanitizer/ubsan/ubsan_handlers.cc
@@ -558,6 +558,21 @@ static void HandleCFIBadType(CFICheckFailData *Data, ValueHandle Vtable,
 #endif
 }  // namespace __ubsan
 
+void __ubsan::__ubsan_handle_cfi_bad_icall(CFIBadIcallData *CallData,
+                                           ValueHandle Function) {
+  GET_REPORT_OPTIONS(false);
+  CFICheckFailData Data = {CFITCK_ICall, CallData->Loc, CallData->Type};
+  handleCFIBadIcall(&Data, Function, Opts);
+}
+
+void __ubsan::__ubsan_handle_cfi_bad_icall_abort(CFIBadIcallData *CallData,
+                                                 ValueHandle Function) {
+  GET_REPORT_OPTIONS(true);
+  CFICheckFailData Data = {CFITCK_ICall, CallData->Loc, CallData->Type};
+  handleCFIBadIcall(&Data, Function, Opts);
+  Die();
+}
+
 void __ubsan::__ubsan_handle_cfi_check_fail(CFICheckFailData *Data,
                                             ValueHandle Value,
                                             uptr ValidVtable) {
diff --git a/libsanitizer/ubsan/ubsan_handlers.h b/libsanitizer/ubsan/ubsan_handlers.h
index ef741ca58ef..394c9eac298 100644
--- a/libsanitizer/ubsan/ubsan_handlers.h
+++ b/libsanitizer/ubsan/ubsan_handlers.h
@@ -156,12 +156,20 @@ enum CFITypeCheckKind : unsigned char {
   CFITCK_ICall,
 };
 
+struct CFIBadIcallData {
+  SourceLocation Loc;
+  const TypeDescriptor &Type;
+};
+
 struct CFICheckFailData {
   CFITypeCheckKind CheckKind;
   SourceLocation Loc;
   const TypeDescriptor &Type;
 };
 
+/// \brief Handle control flow integrity failure for indirect function calls.
+RECOVERABLE(cfi_bad_icall, CFIBadIcallData *Data, ValueHandle Function)
+
 /// \brief Handle control flow integrity failures.
 RECOVERABLE(cfi_check_fail, CFICheckFailData *Data, ValueHandle Function,
             uptr VtableIsValid)
diff --git a/libsanitizer/ubsan/ubsan_handlers_cxx.cc b/libsanitizer/ubsan/ubsan_handlers_cxx.cc
index 015a9ffee02..007a1d6d0c2 100644
--- a/libsanitizer/ubsan/ubsan_handlers_cxx.cc
+++ b/libsanitizer/ubsan/ubsan_handlers_cxx.cc
@@ -142,4 +142,22 @@ void HandleCFIBadType(CFICheckFailData *Data, ValueHandle Vtable,
 }
 }  // namespace __ubsan
 
+void __ubsan::__ubsan_handle_cfi_bad_type(CFIBadTypeData *TypeData,
+                                          ValueHandle Vtable) {
+  GET_REPORT_OPTIONS(false);
+  CFITypeCheckKind TypeCheckKind
+    = static_cast<CFITypeCheckKind> (TypeData->TypeCheckKind);
+  CFICheckFailData Data = {TypeCheckKind, TypeData->Loc, TypeData->Type};
+  HandleCFIBadType(&Data, Vtable, false, Opts);
+}
+
+void __ubsan::__ubsan_handle_cfi_bad_type_abort(CFIBadTypeData *TypeData,
+                                                ValueHandle Vtable) {
+  GET_REPORT_OPTIONS(true);
+  CFITypeCheckKind TypeCheckKind
+    = static_cast<CFITypeCheckKind> (TypeData->TypeCheckKind);
+  CFICheckFailData Data = {TypeCheckKind, TypeData->Loc, TypeData->Type};
+  HandleCFIBadType(&Data, Vtable, false, Opts);
+}
+
 #endif // CAN_SANITIZE_UB
diff --git a/libsanitizer/ubsan/ubsan_handlers_cxx.h b/libsanitizer/ubsan/ubsan_handlers_cxx.h
index 37382359b1e..6ace2b3472b 100644
--- a/libsanitizer/ubsan/ubsan_handlers_cxx.h
+++ b/libsanitizer/ubsan/ubsan_handlers_cxx.h
@@ -23,6 +23,12 @@ struct DynamicTypeCacheMissData {
   unsigned char TypeCheckKind;
 };
 
+struct CFIBadTypeData {
+  SourceLocation Loc;
+  const TypeDescriptor &Type;
+  unsigned char TypeCheckKind;
+};
+
 /// \brief Handle a runtime type check failure, caused by an incorrect vptr.
 /// When this handler is called, all we know is that the type was not in the
 /// cache; this does not necessarily imply the existence of a bug.
@@ -32,6 +38,13 @@ void __ubsan_handle_dynamic_type_cache_miss(
 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
 void __ubsan_handle_dynamic_type_cache_miss_abort(
   DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash);
+
+/// \brief Handle a control flow integrity check failure by printing a
+/// diagnostic.
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE void
+__ubsan_handle_cfi_bad_type(CFIBadTypeData *Data, ValueHandle Vtable);
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE void
+__ubsan_handle_cfi_bad_type_abort(CFIBadTypeData *Data, ValueHandle Vtable);
 }
 
 #endif // UBSAN_HANDLERS_H