[asan] introduce __asan_poison_cxx_array_cookie. This is asan-rt part of PR19838 (Left OOB accesses on new[]-allocated arrays with array cookies are not detected). No tests yet. They will follow once I commit the clang part.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@214711 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/asan/asan_rtl.cc b/lib/asan/asan_rtl.cc
index e0f61e9df..9a268f41d 100644
--- a/lib/asan/asan_rtl.cc
+++ b/lib/asan/asan_rtl.cc
@@ -191,6 +191,9 @@ static void ParseFlagsFromString(Flags *f, const char *str) {
       "Poison (or not) the heap memory on [de]allocation. Zero value is useful "
       "for benchmarking the allocator or instrumentator.");
 
+  ParseFlag(str, &f->poison_array_cookie, "poison_array_cookie",
+      "Poison (or not) the array cookie after operator new[].");
+
   ParseFlag(str, &f->poison_partial, "poison_partial",
       "If true, poison partially addressable 8-byte aligned words "
       "(default=true). This flag affects heap and global buffers, but not "
@@ -272,6 +275,7 @@ void InitializeFlags(Flags *f, const char *env) {
   f->allow_reexec = true;
   f->print_full_thread_history = true;
   f->poison_heap = true;
+  f->poison_array_cookie = true;
   f->poison_partial = true;
   // Turn off alloc/dealloc mismatch checker on Mac and Windows for now.
   // https://code.google.com/p/address-sanitizer/issues/detail?id=131