Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/safestack/overflow.c

@@ -0,0 +1,29 @@
+// RUN: %clang_safestack %s -o %t
+// RUN: %run %t
+
+// RUN: %clang_nosafestack -fno-stack-protector %s -o %t
+// RUN: not %run %t
+
+// Test that buffer overflows on the unsafe stack do not affect variables on the
+// safe stack.
+
+// REQUIRES: stable-runtime
+
+__attribute__((noinline))
+void fct(volatile int *buffer)
+{
+  memset(buffer - 1, 0, 7 * sizeof(int));
+}
+
+int main(int argc, char **argv)
+{
+  int prebuf[7];
+  int value1 = 42;
+  int buffer[5];
+  int value2 = 42;
+  int postbuf[7];
+  fct(prebuf + 1);
+  fct(postbuf + 1);
+  fct(buffer);
+  return value1 != 42 || value2 != 42;
+}