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// Tests free_checks_tail_magic=1.
// RUN: %clang_hwasan %s -o %t
// RUN: %env_hwasan_opts=free_checks_tail_magic=0 %run %t
// RUN: %env_hwasan_opts=free_checks_tail_magic=1 not %run %t 2>&1 | FileCheck %s
// RUN: not %run %t 2>&1 | FileCheck %s
// REQUIRES: stable-runtime
#include <stdlib.h>
#include <stdio.h>
#include <sanitizer/hwasan_interface.h>
static volatile char *sink;
// Overwrite the tail in a non-hwasan function so that we don't detect the
// stores as OOB.
__attribute__((no_sanitize("hwaddress"))) void overwrite_tail() {
sink[20] = 0x42;
sink[24] = 0x66;
}
int main(int argc, char **argv) {
__hwasan_enable_allocator_tagging();
char *p = (char*)malloc(20);
sink = p;
overwrite_tail();
free(p);
// CHECK: ERROR: HWAddressSanitizer: allocation-tail-overwritten; heap object [{{.*}}) of size 20
// CHECK: Stack of invalid access unknown. Issue detected at deallocation time.
// CHECK: deallocated here:
// CHECK: in main {{.*}}tail-magic.c:[[@LINE-4]]
// CHECK: allocated here:
// CHECK: in main {{.*}}tail-magic.c:[[@LINE-9]]
// CHECK: Tail contains: .. .. .. .. 42 {{.. .. ..}} 66
}
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