compiler-rt/test/safestack/overflow.c

   1 // RUN: %clang_safestack %s -o %t
   2 // RUN: %run %t
   3
   4 // RUN: %clang_nosafestack -fno-stack-protector %s -o %t
   5 // RUN: not %run %t
   6
   7 // Test that buffer overflows on the unsafe stack do not affect variables on the
   8 // safe stack.
   9
  10 // REQUIRES: stable-runtime
  11
  12 extern void *memset(void *, int, __typeof__(sizeof(0)));
  13
  14 __attribute__((noinline))
  15 void fct(volatile int *buffer)
  16 {
  17   memset(buffer - 1, 0, 7 * sizeof(int));
  18 }
  19
  20 int main(int argc, char **argv)
  21 {
  22   int prebuf[7];
  23   int value1 = 42;
  24   int buffer[5];
  25   int value2 = 42;
  26   int postbuf[7];
  27   fct(prebuf + 1);
  28   fct(postbuf + 1);
  29   fct(buffer);
  30   return value1 != 42 || value2 != 42;
  31 }