// RUN: %clangxx_cfi -o %t1 %s
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// RUN: %expect_crash_unless_devirt %t1 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %clangxx_cfi -DB32 -o %t2 %s
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// RUN: %expect_crash %t2 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %clangxx_cfi -DB64 -o %t3 %s
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// RUN: %expect_crash %t3 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %clangxx_cfi -DBM -o %t4 %s
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// RUN: %expect_crash %t4 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %clangxx -o %t5 %s
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// RUN: %t5 2>&1 | FileCheck --check-prefix=NCFI %s
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// RUN: %clangxx_cfi_diag -o %t6 %s
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// RUN: %t6 2>&1 | FileCheck --check-prefix=CFI-DIAG %s
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// Tests that the CFI mechanism crashes the program when a virtual table is
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// replaced with a compatible table of function pointers that does not belong to
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// any class, by manually overwriting the virtual table of an object and
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// attempting to make a call through it.
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// REQUIRES: cxxabi
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#include <stdio.h>
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#include "utils.h"
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struct A {
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virtual void f();
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};
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void A::f() {}
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void foo() {
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fprintf(stderr, "foo\n");
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}
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void *fake_vtable[] = { 0, 0, (void *)&foo };
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int main() {
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create_derivers<A>();
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A *a = new A;
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*((void **)a) = fake_vtable + 2; // UB here
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break_optimization(a);
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// CFI: 1
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// NCFI: 1
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fprintf(stderr, "1\n");
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// CFI-NOT: foo
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// NCFI: foo
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// CFI-DIAG: runtime error: control flow integrity check for type 'A' failed during virtual call
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// CFI-DIAG-NEXT: note: invalid vtable
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a->f();
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// We don't check for the absence of a 2 here because under devirtualization
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// our virtual call may be devirtualized and we will proceed with execution
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// rather than crashing.
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// NCFI: {{^2$}}
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fprintf(stderr, "2\n");
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}
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