Android ndk r15c 和 UBSAN clang

Question

我正在尝试使用 ndk r15c 和 clang 构建一个简单的 Android 二进制文件来测试 UBSAN（未定义的行为清理程序）。但是，当尝试链接以下错误时构建失败：

jni/main.cpp:17: error: undefined reference to '__ubsan_handle_type_mismatch_v1'
jni/main.cpp:24: error: undefined reference to '__ubsan_handle_add_overflow'
jni/main.cpp:30: error: undefined reference to '__ubsan_handle_type_mismatch_v1'
jni/main.cpp:32: error: undefined reference to '__ubsan_handle_type_mismatch_v1'
jni/main.cpp:32: error: undefined reference to '__ubsan_handle_type_mismatch_v1'
jni/main.cpp:32: error: undefined reference to '__ubsan_handle_dynamic_type_cache_miss'
jni/main.cpp:33: error: undefined reference to '__ubsan_handle_dynamic_type_cache_miss'
jni/main.cpp:33: error: undefined reference to '__ubsan_handle_dynamic_type_cache_miss'
jni/main.cpp:34: error: undefined reference to '__ubsan_vptr_type_cache'
jni/main.cpp:34: error: undefined reference to '__ubsan_vptr_type_cache'
jni/main.cpp:34: error: undefined reference to '__ubsan_vptr_type_cache'
jni/main.cpp:34: error: undefined reference to '__ubsan_handle_dynamic_type_cache_miss'
jni/main.cpp:36: error: undefined reference to '__ubsan_vptr_type_cache'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_ostream.c:336: error: undefined reference to '__ubsan_handle_sub_overflow'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_ostream.c:357: error: undefined reference to '__ubsan_handle_load_invalid_value'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_ostream.c:343: error: undefined reference to '__ubsan_handle_load_invalid_value'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_ostream.c:348: error: undefined reference to '__ubsan_handle_load_invalid_value'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_ostream.h:192: error: undefined reference to '__ubsan_handle_load_invalid_value'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_ostream.h:136: error: undefined reference to '__ubsan_handle_negate_overflow'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/char_traits.h:194: error: undefined reference to '__ubsan_handle_negate_overflow'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_string.h:379: error: undefined reference to '__ubsan_handle_add_overflow'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_string_base.h:105: error: undefined reference to '__ubsan_handle_negate_overflow'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_string_base.h:105: error: undefined reference to '__ubsan_handle_divrem_overflow'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_alloc.h:330: error: undefined reference to '__ubsan_handle_negate_overflow'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_alloc.h:330: error: undefined reference to '__ubsan_handle_divrem_overflow'
/opt/android_ndk/android-ndk-r15c/sources/cxx-stl/stlport/stlport/stl/_alloc.h:352: error: undefined reference to '__ubsan_handle_divrem_overflow'

我的Android.mk文件如下：

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)

LOCAL_CFLAGS += -Wall

LOCAL_LDLIBS := -L$(LOCAL_PATH)/lib -llog -g

LOCAL_C_INCLUDES := bionic
LOCAL_C_INCLUDES += $(LOCAL_PATH)/include

LOCAL_SRC_FILES:= main.cpp
LOCAL_CPPFLAGS := -Wall -fPIE -fexceptions -fsanitize=undefined
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog -fPIE -pie -fsanitize=undefined 

LOCAL_MODULE := ubsan_test

include $(BUILD_EXECUTABLE)

我的Application.mk如下：

NDK_TOOLCHAIN_VERSION:=clang
APP_STL:=stlport_static
APP_ABI := armeabi armeabi-v7a
APP_PLATFORM := android-17

我猜我错过了一些链接器标志或一些其他设置，但无法弄清楚发生了什么。查看 ubsan 运行时中的符号，符号似乎存在。

注意：我也尝试在我的 Android.mk 中使用 LOCAL_SANITIZE := undefined 而不是 -fsanitize=undefined，结果相同。

Answer 1

我们目前不在 NDK 中发布 ubsan 运行时：https://github.com/android-ndk/ndk/issues/183

目前，您可以改用-fsanitize=undefined -fsanitize-trap=undefined。这并不理想，因为您只会得到一个陷阱（ARM 上的 SIGILL，很确定它对于其他平台也是如此），而不是有用的诊断，但在我们将 ubsan 运行时放入 NDK 之前，总比没有好。