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| // RUN: %clangxx_cfi_dso_diag -std=c++11 %s -o %t
// RUN: %t zero 2>&1 | FileCheck --check-prefix=CHECK-ZERO %s
// RUN: %t unaddressable 2>&1 | FileCheck --check-prefix=CHECK-UNADDR %s
// RUN: %t 2>&1 | FileCheck --check-prefix=CHECK-TYPEINFO %s
// RUN: %clangxx_cfi_diag -std=c++11 %s -o %t2
// RUN: %t2 zero 2>&1 | FileCheck --check-prefix=CHECK-ZERO %s
// RUN: %t2 unaddressable 2>&1 | FileCheck --check-prefix=CHECK-UNADDR %s
// RUN: %t2 2>&1 | FileCheck --check-prefix=CHECK-TYPEINFO %s
// REQUIRES: cxxabi
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
struct A {
virtual void f();
};
void A::f() {}
int main(int argc, char *argv[]) {
char *volatile p = reinterpret_cast<char *>(new A());
if (argc > 1 && strcmp(argv[1], "unaddressable") == 0) {
void *vtable = mmap(nullptr, 4096, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
// Create an object with a vtable in an unaddressable memory region.
*(uintptr_t *)p = (uintptr_t)vtable + 64;
// CHECK-UNADDR: runtime error: control flow integrity check for type 'A' failed during cast
// CHECK-UNADDR: note: invalid vtable
// CHECK-UNADDR: <memory cannot be printed>
// CHECK-UNADDR: runtime error: control flow integrity check for type 'A' failed during cast
// CHECK-UNADDR: note: invalid vtable
// CHECK-UNADDR: <memory cannot be printed>
} else if (argc > 1 && strcmp(argv[1], "zero") == 0) {
// Create an object with a vtable outside of any known DSO, but still in an
// addressable area.
void *vtable = calloc(1, 128);
*(uintptr_t *)p = (uintptr_t)vtable + 64;
// CHECK-ZERO: runtime error: control flow integrity check for type 'A' failed during cast
// CHECK-ZERO: note: invalid vtable
// CHECK-ZERO: 00 00 00 00 00 00 00 00
// CHECK-ZERO: runtime error: control flow integrity check for type 'A' failed during cast
// CHECK-ZERO: note: invalid vtable
// CHECK-ZERO: 00 00 00 00 00 00 00 00
} else {
// Create an object with a seemingly fine vtable, but with an unaddressable
// typeinfo pointer.
void *vtable = calloc(1, 128);
memset(vtable, 0xFE, 128);
*(uintptr_t *)p = (uintptr_t)vtable + 64;
// CHECK-TYPEINFO: runtime error: control flow integrity check for type 'A' failed during cast
// CHECK-TYPEINFO: note: invalid vtable
// CHECK-TYPEINFO: fe fe fe fe fe fe fe fe
// CHECK-TYPEINFO: runtime error: control flow integrity check for type 'A' failed during cast
// CHECK-TYPEINFO: note: invalid vtable
// CHECK-TYPEINFO: fe fe fe fe fe fe fe fe
}
A *volatile pa = reinterpret_cast<A *>(p);
pa = reinterpret_cast<A *>(p);
}
|