intercept_strlen.cc revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
1// RUN: %clangxx_asan -O0 %s -Fe%t
2// RUN: not %run %t 2>&1 | FileCheck %s
3
4#include <stdio.h>
5#include <string.h>
6
7int main() {
8  char str[] = "Hello";
9  if (5 != strlen(str))
10    return 1;
11
12  printf("Initial test OK\n");
13  fflush(0);
14// CHECK: Initial test OK
15
16  str[5] = '!';  // Losing '\0' at the end.
17  int len = strlen(str);
18// CHECK: AddressSanitizer: stack-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
19// FIXME: Should be READ of size 1, see issue 155.
20// CHECK: READ of size {{[0-9]+}} at [[ADDR]] thread T0
21// CHECK:      strlen
22// CHECK-NEXT: main {{.*}}intercept_strlen.cc:[[@LINE-5]]
23// CHECK: Address [[ADDR]] is located in stack of thread T0 at offset {{.*}} in frame
24// CHECK-NEXT: main {{.*}}intercept_strlen.cc
25// CHECK: 'str' <== Memory access at offset {{.*}} overflows this variable
26  return len < 6;
27}
28