1 // RUN: %clangxx_cfi_dso -DSHARED_LIB %s -fPIC -shared -o %t1-so.so 2 // RUN: %clangxx_cfi_dso %s -o %t1 %t1-so.so 3 // RUN: %expect_crash %t1 2>&1 | FileCheck --check-prefix=CFI %s 4 // RUN: %expect_crash %t1 x 2>&1 | FileCheck --check-prefix=CFI-CAST %s 5 6 // RUN: %clangxx_cfi_dso -DB32 -DSHARED_LIB %s -fPIC -shared -o %t2-so.so 7 // RUN: %clangxx_cfi_dso -DB32 %s -o %t2 %t2-so.so 8 // RUN: %expect_crash %t2 2>&1 | FileCheck --check-prefix=CFI %s 9 // RUN: %expect_crash %t2 x 2>&1 | FileCheck --check-prefix=CFI-CAST %s 10 11 // RUN: %clangxx_cfi_dso -DB64 -DSHARED_LIB %s -fPIC -shared -o %t3-so.so 12 // RUN: %clangxx_cfi_dso -DB64 %s -o %t3 %t3-so.so 13 // RUN: %expect_crash %t3 2>&1 | FileCheck --check-prefix=CFI %s 14 // RUN: %expect_crash %t3 x 2>&1 | FileCheck --check-prefix=CFI-CAST %s 15 16 // RUN: %clangxx_cfi_dso -DBM -DSHARED_LIB %s -fPIC -shared -o %t4-so.so 17 // RUN: %clangxx_cfi_dso -DBM %s -o %t4 %t4-so.so 18 // RUN: %expect_crash %t4 2>&1 | FileCheck --check-prefix=CFI %s 19 // RUN: %expect_crash %t4 x 2>&1 | FileCheck --check-prefix=CFI-CAST %s 20 21 // RUN: %clangxx -DBM -DSHARED_LIB %s -fPIC -shared -o %t5-so.so 22 // RUN: %clangxx -DBM %s -o %t5 %t5-so.so 23 // RUN: %t5 2>&1 | FileCheck --check-prefix=NCFI %s 24 // RUN: %t5 x 2>&1 | FileCheck --check-prefix=NCFI %s 25 26 // RUN: %clangxx -DBM -DSHARED_LIB %s -fPIC -shared -o %t6-so.so 27 // RUN: %clangxx_cfi_dso -DBM %s -o %t6 %t6-so.so 28 // RUN: %t6 2>&1 | FileCheck --check-prefix=NCFI %s 29 // RUN: %t6 x 2>&1 | FileCheck --check-prefix=NCFI %s 30 31 // Tests that the CFI mechanism crashes the program when making a virtual call 32 // to an object of the wrong class but with a compatible vtable, by casting a 33 // pointer to such an object and attempting to make a call through it. 34 35 // REQUIRES: cxxabi 36 37 #include <stdio.h> 38 #include <string.h> 39 40 struct A { 41 virtual void f(); 42 }; 43 44 void *create_B(); 45 46 #ifdef SHARED_LIB 47 48 #include "../utils.h" 49 struct B { 50 virtual void f(); 51 }; 52 void B::f() {} 53 54 void *create_B() { 55 create_derivers<B>(); 56 return (void *)(new B()); 57 } 58 59 #else 60 61 void A::f() {} 62 63 int main(int argc, char *argv[]) { 64 void *p = create_B(); 65 A *a; 66 67 // CFI: =0= 68 // CFI-CAST: =0= 69 // NCFI: =0= 70 fprintf(stderr, "=0=\n"); 71 72 if (argc > 1 && argv[1][0] == 'x') { 73 // Test cast. BOOM. 74 a = (A*)p; 75 } else { 76 // Invisible to CFI. Test virtual call later. 77 memcpy(&a, &p, sizeof(a)); 78 } 79 80 // CFI: =1= 81 // CFI-CAST-NOT: =1= 82 // NCFI: =1= 83 fprintf(stderr, "=1=\n"); 84 85 a->f(); // UB here 86 87 // CFI-NOT: =2= 88 // CFI-CAST-NOT: =2= 89 // NCFI: =2= 90 fprintf(stderr, "=2=\n"); 91 } 92 #endif 93