1// RUN: %clangxx_cfi_dso -std=c++11 -g -DSHARED_LIB %s -fPIC -shared -o %t-cfi-so.so
2// RUN: %clangxx -std=c++11 -g -DSHARED_LIB %s -fPIC -shared -o %t-nocfi-so.so
3// RUN: %clangxx_cfi_dso -std=c++11 -g %s -o %t
4
5// RUN: %expect_crash %t start 2>&1 | FileCheck %s
6// RUN: %expect_crash %t mmap 2>&1 | FileCheck %s
7// RUN: %expect_crash %t dlopen %t-cfi-so.so 2>&1 | FileCheck %s
8// RUN: %expect_crash %t dlclose %t-cfi-so.so 2>&1 | FileCheck %s
9// RUN: %expect_crash %t dlopen %t-nocfi-so.so 2>&1 | FileCheck %s
10// RUN: %expect_crash %t dlclose %t-nocfi-so.so 2>&1 | FileCheck %s
11
12// Tests that shadow is read-only most of the time.
13// REQUIRES: cxxabi
14
15#include <assert.h>
16#include <dlfcn.h>
17#include <stdio.h>
18#include <stdint.h>
19#include <stdlib.h>
20#include <string.h>
21#include <sys/mman.h>
22
23struct A {
24  virtual void f();
25};
26
27#ifdef SHARED_LIB
28
29void A::f() {}
30
31extern "C" A *create_A() { return new A(); }
32
33#else
34
35constexpr unsigned kShadowGranularity = 12;
36
37namespace __cfi {
38uintptr_t GetShadow();
39}
40
41void write_shadow(void *ptr) {
42  uintptr_t base = __cfi::GetShadow();
43  uint16_t *s =
44      (uint16_t *)(base + (((uintptr_t)ptr >> kShadowGranularity) << 1));
45  fprintf(stderr, "going to crash\n");
46  // CHECK: going to crash
47  *s = 42;
48  fprintf(stderr, "did not crash\n");
49  // CHECK-NOT: did not crash
50  exit(1);
51}
52
53int main(int argc, char *argv[]) {
54  assert(argc > 1);
55  const bool test_mmap = strcmp(argv[1], "mmap") == 0;
56  const bool test_start = strcmp(argv[1], "start") == 0;
57  const bool test_dlopen = strcmp(argv[1], "dlopen") == 0;
58  const bool test_dlclose = strcmp(argv[1], "dlclose") == 0;
59  const char *lib = argc > 2 ? argv[2] : nullptr;
60
61  if (test_start)
62    write_shadow((void *)&main);
63
64  if (test_mmap) {
65    void *p = mmap(nullptr, 1 << 20, PROT_READ | PROT_WRITE | PROT_EXEC,
66                   MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
67    assert(p != MAP_FAILED);
68    write_shadow((char *)p + 100);
69  } else {
70    void *handle = dlopen(lib, RTLD_NOW);
71    assert(handle);
72    void *create_A = dlsym(handle, "create_A");
73    assert(create_A);
74
75    if (test_dlopen)
76      write_shadow(create_A);
77
78    int res = dlclose(handle);
79    assert(res == 0);
80
81    if (test_dlclose)
82      write_shadow(create_A);
83  }
84}
85#endif
86