libsanitizer: Readd __ubsan_handle_function_type_mismatch_v1{,_abort}

So that we don't have to bump libubsan.so.1 SONAME, the following patch
reverts part of the changes which removed two handlers.  While we don't
actually use them from GCC, we shouldn't remove supported entrypoints
unless SONAME is changed (removal of __interceptor_* or ___interceptor_*
is fine).  This is the only removal, other libraries just added some
symbols.

2023-11-15  Jakub Jelinek  <jakub@redhat.com>

	* ubsan/ubsan_handlers_cxx.h (FunctionTypeMismatchData): Forward
	declare.
	(__ubsan_handle_function_type_mismatch_v1,
	__ubsan_handle_function_type_mismatch_v1_abort): Declare.
	* ubsan/ubsan_handlers_cxx.cpp (handleFunctionTypeMismatch,
	__ubsan_handle_function_type_mismatch_v1,
	__ubsan_handle_function_type_mismatch_v1_abort): New functions readded
	for backwards compatibility from older ubsan.
	* ubsan/ubsan_interface.inc (__ubsan_handle_function_type_mismatch_v1,
	__ubsan_handle_function_type_mismatch_v1_abort): Readd.

3 files changed, 59 insertions, 0 deletions

diff --git a/libsanitizer/ubsan/ubsan_handlers_cxx.cpp b/libsanitizer/ubsan/ubsan_handlers_cxx.cpp
index 206a0bb..0317a3d 100644
--- a/libsanitizer/ubsan/ubsan_handlers_cxx.cpp
+++ b/libsanitizer/ubsan/ubsan_handlers_cxx.cpp
@@ -156,6 +156,50 @@ void __ubsan_handle_cfi_bad_type(CFICheckFailData *Data, ValueHandle Vtable,
     Diag(Loc, DL_Note, ET, "check failed in %0, vtable located in %1")
         << SrcModule << DstModule;
 }
+
+static bool handleFunctionTypeMismatch(FunctionTypeMismatchData *Data,
+                                       ValueHandle Function,
+                                       ValueHandle calleeRTTI,
+                                       ValueHandle fnRTTI, ReportOptions Opts) {
+  if (checkTypeInfoEquality(reinterpret_cast<void *>(calleeRTTI),
+                            reinterpret_cast<void *>(fnRTTI)))
+    return false;
+
+  SourceLocation CallLoc = Data->Loc.acquire();
+  ErrorType ET = ErrorType::FunctionTypeMismatch;
+
+  if (ignoreReport(CallLoc, Opts, ET))
+    return true;
+
+  ScopedReport R(Opts, CallLoc, ET);
+
+  SymbolizedStackHolder FLoc(getSymbolizedLocation(Function));
+  const char *FName = FLoc.get()->info.function;
+  if (!FName)
+    FName = "(unknown)";
+
+  Diag(CallLoc, DL_Error, ET,
+       "call to function %0 through pointer to incorrect function type %1")
+      << FName << Data->Type;
+  Diag(FLoc, DL_Note, ET, "%0 defined here") << FName;
+  return true;
+}
+
+void __ubsan_handle_function_type_mismatch_v1(FunctionTypeMismatchData *Data,
+                                              ValueHandle Function,
+                                              ValueHandle calleeRTTI,
+                                              ValueHandle fnRTTI) {
+  GET_REPORT_OPTIONS(false);
+  handleFunctionTypeMismatch(Data, Function, calleeRTTI, fnRTTI, Opts);
+}
+
+void __ubsan_handle_function_type_mismatch_v1_abort(
+    FunctionTypeMismatchData *Data, ValueHandle Function,
+    ValueHandle calleeRTTI, ValueHandle fnRTTI) {
+  GET_REPORT_OPTIONS(true);
+  if (handleFunctionTypeMismatch(Data, Function, calleeRTTI, fnRTTI, Opts))
+    Die();
+}
 }  // namespace __ubsan
 
 #endif // CAN_SANITIZE_UB
diff --git a/libsanitizer/ubsan/ubsan_handlers_cxx.h b/libsanitizer/ubsan/ubsan_handlers_cxx.h
index 71695cb..f6f24e8 100644
--- a/libsanitizer/ubsan/ubsan_handlers_cxx.h
+++ b/libsanitizer/ubsan/ubsan_handlers_cxx.h
@@ -33,6 +33,19 @@ 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);
+
+struct FunctionTypeMismatchData;
+
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE void
+__ubsan_handle_function_type_mismatch_v1(FunctionTypeMismatchData *Data,
+                                         ValueHandle Val,
+                                         ValueHandle calleeRTTI,
+                                         ValueHandle fnRTTI);
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE void
+__ubsan_handle_function_type_mismatch_v1_abort(FunctionTypeMismatchData *Data,
+                                               ValueHandle Val,
+                                               ValueHandle calleeRTTI,
+                                               ValueHandle fnRTTI);
 }
 
 #endif // UBSAN_HANDLERS_CXX_H
diff --git a/libsanitizer/ubsan/ubsan_interface.inc b/libsanitizer/ubsan/ubsan_interface.inc
index cb27feb..f95f71a 100644
--- a/libsanitizer/ubsan/ubsan_interface.inc
+++ b/libsanitizer/ubsan/ubsan_interface.inc
@@ -21,6 +21,8 @@ INTERFACE_FUNCTION(__ubsan_handle_dynamic_type_cache_miss)
 INTERFACE_FUNCTION(__ubsan_handle_dynamic_type_cache_miss_abort)
 INTERFACE_FUNCTION(__ubsan_handle_float_cast_overflow)
 INTERFACE_FUNCTION(__ubsan_handle_float_cast_overflow_abort)
+INTERFACE_FUNCTION(__ubsan_handle_function_type_mismatch_v1)
+INTERFACE_FUNCTION(__ubsan_handle_function_type_mismatch_v1_abort)
 INTERFACE_FUNCTION(__ubsan_handle_function_type_mismatch)
 INTERFACE_FUNCTION(__ubsan_handle_function_type_mismatch_abort)
 INTERFACE_FUNCTION(__ubsan_handle_implicit_conversion)