diff options
Diffstat (limited to 'libcxx/src/include/overridable_function.h')
| -rw-r--r-- | libcxx/src/include/overridable_function.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/libcxx/src/include/overridable_function.h b/libcxx/src/include/overridable_function.h index 7b0fba1..fca66ea 100644 --- a/libcxx/src/include/overridable_function.h +++ b/libcxx/src/include/overridable_function.h @@ -13,6 +13,10 @@ #include <__config> #include <cstdint> +#if defined(__arm64e__) && __has_feature(ptrauth_calls) +# include <ptrauth.h> +#endif + #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) # pragma GCC system_header #endif @@ -81,6 +85,14 @@ _LIBCPP_HIDE_FROM_ABI bool __is_function_overridden(_Ret (*__fptr)(_Args...)) no uintptr_t __end = reinterpret_cast<uintptr_t>(&__lcxx_override_end); uintptr_t __ptr = reinterpret_cast<uintptr_t>(__fptr); +#if defined(__arm64e__) && __has_feature(ptrauth_calls) + // We must pass a void* to ptrauth_strip since it only accepts a pointer type. Also, in particular, + // we must NOT pass a function pointer, otherwise we will strip the function pointer, and then attempt + // to authenticate and re-sign it when casting it to a uintptr_t again, which will fail because we just + // stripped the function pointer. See rdar://122927845. + __ptr = reinterpret_cast<uintptr_t>(ptrauth_strip(reinterpret_cast<void*>(__ptr), ptrauth_key_function_pointer)); +#endif + // Finally, the function was overridden if it falls outside of the section's bounds. return __ptr < __start || __ptr > __end; } |