[msan][libcxx] Enable -fsanitize-memory-param-retval

We are considering to make -fsanitize-memory-param-retval enabled by default so probably this patch is unnneded.

Reviewed By: #libc, EricWF

Differential Revision: https://reviews.llvm.org/D123979

Author: vitalybuka

libcxx/CMakeLists.txt

@@ -733,7 +733,7 @@ function(get_sanitizer_flags OUT_VAR  USE_SANITIZER)
     if (USE_SANITIZER STREQUAL "Address")
       append_flags(SANITIZER_FLAGS "-fsanitize=address")
     elseif (USE_SANITIZER MATCHES "Memory(WithOrigins)?")
-      append_flags(SANITIZER_FLAGS -fsanitize=memory)
+      append_flags(SANITIZER_FLAGS -fsanitize=memory -fsanitize-memory-param-retval)
       if (USE_SANITIZER STREQUAL "MemoryWithOrigins")
         append_flags(SANITIZER_FLAGS "-fsanitize-memory-track-origins")
       endif()

libcxx/utils/libcxx/test/params.py

@@ -146,9 +146,9 @@ def getStdFlag(cfg, std):
               AddFlag('-fsanitize=address') if sanitizer == 'Address' else None,
               AddFeature('asan')            if sanitizer == 'Address' else None,
 
-              AddFlag('-fsanitize=memory')               if sanitizer in ['Memory', 'MemoryWithOrigins'] else None,
-              AddFeature('msan')                         if sanitizer in ['Memory', 'MemoryWithOrigins'] else None,
-              AddFlag('-fsanitize-memory-track-origins') if sanitizer == 'MemoryWithOrigins' else None,
+              AddFlag('-fsanitize=memory -fsanitize-memory-param-retval') if sanitizer in ['Memory', 'MemoryWithOrigins'] else None,
+              AddFeature('msan')                                          if sanitizer in ['Memory', 'MemoryWithOrigins'] else None,
+              AddFlag('-fsanitize-memory-track-origins')                  if sanitizer == 'MemoryWithOrigins' else None,
 
               AddFlag('-fsanitize=thread') if sanitizer == 'Thread' else None,
               AddFeature('tsan')           if sanitizer == 'Thread' else None,