compiler-rt/test/asan/TestCases/vla_condition_overflow.cpp

   1 // RUN: %clangxx_asan -O0 -mllvm -asan-instrument-dynamic-allocas %s -o %t
   2 // RUN: not %run %t 2>&1 | FileCheck %s
   3 //
   4 // REQUIRES: stable-runtime
   5
   6 #include <assert.h>
   7 #include <stdint.h>
   8
   9 __attribute__((noinline)) void foo(int index, int len) {
  10   if (index > len) {
  11     char str[len];
  12     assert(!(reinterpret_cast<uintptr_t>(str) & 31L));
  13     str[index] = '1'; // BOOM
  14 // CHECK: ERROR: AddressSanitizer: dynamic-stack-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
  15 // CHECK: WRITE of size 1 at [[ADDR]] thread T0
  16   }
  17 }
  18
  19 int main(int argc, char **argv) {
  20   foo(33, 10);
  21   return 0;
  22 }