1// RUN: %clangxx_asan -O0 -mllvm -asan-instrument-dynamic-allocas %s -o %t
2// RUN: not %run %t 2>&1 | FileCheck %s
3//
4
5#include <assert.h>
6#include <stdint.h>
7
8struct A {
9 char a[3];
10 int b[3];
11};
12
13__attribute__((noinline)) void foo(int index, int len) {
14 volatile struct A str[len] __attribute__((aligned(32)));
15 assert(!(reinterpret_cast<uintptr_t>(str) & 31L));
16 str[index].a[0] = '1'; // BOOM
17// CHECK: ERROR: AddressSanitizer: dynamic-stack-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
18// CHECK: WRITE of size 1 at [[ADDR]] thread T0
19}
20
21int main(int argc, char **argv) {
22 foo(index: 10, len: 10);
23 return 0;
24}
25

source code of compiler-rt/test/asan/TestCases/alloca_detect_custom_size_.cpp