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 // Tests that the CFI mechanism crashes the program when making a virtual call 27 // to an object of the wrong class but with a compatible vtable, by casting a 28 // pointer to such an object and attempting to make a call through it. 29 30 // REQUIRES: cxxabi 31 32 #include <stdio.h> 33 #include <string.h> 34 35 struct A { 36 virtual void f(); 37 }; 38 39 void *create_B(); 40 41 #ifdef SHARED_LIB 42 43 #include "../utils.h" 44 struct B { 45 virtual void f(); 46 }; 47 void B::f() {} 48 49 void *create_B() { 50 create_derivers<B>(); 51 return (void *)(new B()); 52 } 53 54 #else 55 56 void A::f() {} 57 58 int main(int argc, char *argv[]) { 59 void *p = create_B(); 60 A *a; 61 62 // CFI: =0= 63 // CFI-CAST: =0= 64 // NCFI: =0= 65 fprintf(stderr, "=0=\n"); 66 67 if (argc > 1 && argv[1][0] == 'x') { 68 // Test cast. BOOM. 69 a = (A*)p; 70 } else { 71 // Invisible to CFI. Test virtual call later. 72 memcpy(&a, &p, sizeof(a)); 73 } 74 75 // CFI: =1= 76 // CFI-CAST-NOT: =1= 77 // NCFI: =1= 78 fprintf(stderr, "=1=\n"); 79 80 a->f(); // UB here 81 82 // CFI-NOT: =2= 83 // CFI-CAST-NOT: =2= 84 // NCFI: =2= 85 fprintf(stderr, "=2=\n"); 86 } 87 #endif 88
