Snap for 9147254 from 159a0e884f639321811722251bf712ecaa50522f to android13-tests-release

Change-Id: Ic61910f78680a4c571690bd2f374cbfe470d27a4

1 files changed, 4 insertions, 3 deletions

diff --git a/tests/stack_protector_test_helper.cpp b/tests/stack_protector_test_helper.cpp
index fd90b939b..eddd94074 100644
--- a/tests/stack_protector_test_helper.cpp
+++ b/tests/stack_protector_test_helper.cpp
@@ -19,7 +19,8 @@ __attribute__((noinline)) void modify_stack_protector_test() {
   // We can't use memset here because it's fortified, and we want to test
   // the line of defense *after* that.
   // Without volatile, the generic x86/x86-64 targets don't write to the stack.
-  volatile char* p;
-  p = reinterpret_cast<volatile char*>(&p + 1);
-  *p = '\0';
+  // We can't make a constant change, since the existing byte might already have
+  // had that value.
+  volatile char* p = reinterpret_cast<volatile char*>(&p + 1);
+  *p = ~*p;
 }