1 // Tests free_checks_tail_magic=1.
2 // RUN: %clang_hwasan  %s -o %t
3 // RUN: %env_hwasan_opts=free_checks_tail_magic=0     %run %t
4 // RUN: %env_hwasan_opts=free_checks_tail_magic=1 not %run %t 2>&1 | FileCheck %s
5 // RUN:                                           not %run %t 2>&1 | FileCheck %s
6 
7 // REQUIRES: stable-runtime
8 
9 #include <stdlib.h>
10 #include <stdio.h>
11 #include <sanitizer/hwasan_interface.h>
12 
13 #include "utils.h"
14 
15 static volatile char *sink;
16 
17 // Overwrite the tail in a non-hwasan function so that we don't detect the
18 // stores as OOB.
overwrite_tail()19 __attribute__((no_sanitize("hwaddress"))) void overwrite_tail() {
20   (*UNTAG(&sink))[20] = 0x42;
21   (*UNTAG(&sink))[24] = 0x66;
22 }
23 
main(int argc,char ** argv)24 int main(int argc, char **argv) {
25   __hwasan_enable_allocator_tagging();
26 
27   char *p = (char*)malloc(20);
28   sink = UNTAG(p);
29   overwrite_tail();
30   free(p);
31 // CHECK: ERROR: HWAddressSanitizer: allocation-tail-overwritten; heap object [{{.*}}) of size 20
32 // CHECK: in main {{.*}}tail-magic.c:[[@LINE-2]]
33 // CHECK: allocated here:
34 // CHECK: in main {{.*}}tail-magic.c:[[@LINE-7]]
35 // CHECK: Tail contains: .. .. .. .. 42 {{.. .. ..}} 66
36 }
37