| 1 | // RUN: %clangxx_cfi -o %t1 %s |
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| 2 | // RUN: %expect_crash_unless_devirt %run %t1 2>&1 | FileCheck --check-prefix=CFI %s |
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| 3 | |
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| 4 | // RUN: %clangxx_cfi -DB32 -o %t2 %s |
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| 5 | // RUN: %expect_crash %run %t2 2>&1 | FileCheck --check-prefix=CFI %s |
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| 6 | |
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| 7 | // RUN: %clangxx_cfi -DB64 -o %t3 %s |
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| 8 | // RUN: %expect_crash %run %t3 2>&1 | FileCheck --check-prefix=CFI %s |
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| 9 | |
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| 10 | // RUN: %clangxx_cfi -DBM -o %t4 %s |
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| 11 | // RUN: %expect_crash %run %t4 2>&1 | FileCheck --check-prefix=CFI %s |
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| 12 | |
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| 13 | // RUN: %clangxx -o %t5 %s |
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| 14 | // RUN: %run %t5 2>&1 | FileCheck --check-prefix=NCFI %s |
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| 15 | |
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| 16 | // RUN: %clangxx_cfi_diag -o %t6 %s |
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| 17 | // RUN: %run %t6 2>&1 | FileCheck --check-prefix=CFI-DIAG %s |
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| 18 | |
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| 19 | // Tests that the CFI mechanism crashes the program when a virtual table is |
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| 20 | // replaced with a compatible table of function pointers that does not belong to |
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| 21 | // any class, by manually overwriting the virtual table of an object and |
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| 22 | // attempting to make a call through it. |
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| 23 | |
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| 24 | // REQUIRES: cxxabi |
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| 25 | |
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| 26 | #include <stdio.h> |
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| 27 | #include "utils.h" |
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| 28 | |
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| 29 | struct A { |
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| 30 | virtual void f(); |
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| 31 | }; |
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| 32 | |
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| 33 | void A::f() {} |
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| 34 | |
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| 35 | void foo() { |
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| 36 | fprintf(stderr, format: "foo\n" ); |
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| 37 | } |
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| 38 | |
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| 39 | void *fake_vtable[] = { 0, 0, (void *)&foo }; |
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| 40 | |
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| 41 | int main() { |
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| 42 | create_derivers<A>(); |
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| 43 | |
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| 44 | A *a = new A; |
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| 45 | *((void **)a) = fake_vtable + 2; // UB here |
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| 46 | break_optimization(arg: a); |
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| 47 | |
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| 48 | // CFI: 1 |
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| 49 | // NCFI: 1 |
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| 50 | fprintf(stderr, format: "1\n" ); |
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| 51 | |
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| 52 | // CFI-NOT: foo |
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| 53 | // NCFI: foo |
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| 54 | // CFI-DIAG: runtime error: control flow integrity check for type 'A' failed during virtual call |
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| 55 | // CFI-DIAG-NEXT: note: invalid vtable |
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| 56 | a->f(); |
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| 57 | |
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| 58 | // We don't check for the absence of a 2 here because under devirtualization |
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| 59 | // our virtual call may be devirtualized and we will proceed with execution |
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| 60 | // rather than crashing. |
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| 61 | |
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| 62 | // NCFI: {{^2$}} |
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| 63 | fprintf(stderr, format: "2\n" ); |
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| 64 | } |
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| 65 | |
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