1 // RUN: %clangxx_cfi -o %t1 %s
2 // RUN: %expect_crash %t1 2>&1 | FileCheck --check-prefix=CFI %s
3 
4 // RUN: %clangxx_cfi -DB32 -o %t2 %s
5 // RUN: %expect_crash %t2 2>&1 | FileCheck --check-prefix=CFI %s
6 
7 // RUN: %clangxx_cfi -DB64 -o %t3 %s
8 // RUN: %expect_crash %t3 2>&1 | FileCheck --check-prefix=CFI %s
9 
10 // RUN: %clangxx_cfi -DBM -o %t4 %s
11 // RUN: %expect_crash %t4 2>&1 | FileCheck --check-prefix=CFI %s
12 
13 // RUN: %clangxx -o %t5 %s
14 // RUN: %t5 2>&1 | FileCheck --check-prefix=NCFI %s
15 
16 // RUN: %clangxx_cfi_diag -o %t6 %s
17 // RUN: %t6 2>&1 | FileCheck --check-prefix=CFI-DIAG %s
18 
19 // Tests that the CFI mechanism crashes the program when a virtual table is
20 // replaced with a compatible table of function pointers that does not belong to
21 // any class, by manually overwriting the virtual table of an object and
22 // attempting to make a call through it.
23 
24 // REQUIRES: cxxabi
25 
26 #include <stdio.h>
27 #include "utils.h"
28 
29 struct A {
30   virtual void f();
31 };
32 
f()33 void A::f() {}
34 
foo()35 void foo() {
36   fprintf(stderr, "foo\n");
37 }
38 
39 void *fake_vtable[] = { 0, 0, (void *)&foo };
40 
main()41 int main() {
42   create_derivers<A>();
43 
44   A *a = new A;
45   *((void **)a) = fake_vtable + 2; // UB here
46   break_optimization(a);
47 
48   // CFI: 1
49   // NCFI: 1
50   fprintf(stderr, "1\n");
51 
52   // CFI-NOT: foo
53   // NCFI: foo
54   // CFI-DIAG: runtime error: control flow integrity check for type 'A' failed during virtual call
55   // CFI-DIAG-NEXT: note: invalid vtable
56   a->f();
57 
58   // CFI-NOT: {{^2$}}
59   // NCFI: {{^2$}}
60   fprintf(stderr, "2\n");
61 }
62