[ASan] Add use_madv_dontdump flag.

Differential Revision: http://reviews.llvm.org/D7294

llvm-svn: 227959

1 files changed, 6 insertions, 0 deletions

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc b/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc
index 1ecbffed5bc..11828e6cdf5 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc
@@ -50,6 +50,12 @@ void NoHugePagesInRegion(uptr addr, uptr size) {
 #endif  // MADV_NOHUGEPAGE
 }
 
+void DontDumpShadowMemory(uptr addr, uptr length) {
+#ifdef MADV_DONTDUMP
+  madvise((void *)addr, length, MADV_DONTDUMP);
+#endif
+}
+
 static rlim_t getlim(int res) {
   rlimit rlim;
   CHECK_EQ(0, getrlimit(res, &rlim));