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NDK加载 LLVM Pass方案

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周杰伦

文章分类CTF对抗企业安全阅读数 : 621阅读时长 : 9分钟

NDK加载 LLVM Pass方案

本文基于 ndk r25c （25.2.9519653）
仅测试 Linux 和 macOS

获取ndk r25c

直接下载

点只因下载：

使用sdkmanager安装

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$ANDROID_HOME / tools / bin / sdkmanager - - install "ndk;25.2.9519653"

坑：archlinux 需要 sudo archlinux-java set java-8-openjdk

查看clang信息

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cat $ANDROID_HOME / ndk / 25.2 . 9519653 / toolchains / llvm / prebuilt / linux - x86_64 / AndroidVersion.txt

内容：

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14.0 . 7
based on r450784d1
for additional information on LLVM revision and cherry - picks, see clang_source_info.md

下载未精简的clang

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然后去Google的 prebuilt clang仓库找到 r450784d1 相关的分支并打开：

 

 

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点开最新的一个commit，进入

 

 

然后点击tgz下载这一份clang

 

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然后基于这一份clang直接编译llvm动态库插件就可以直接用ndk加载了

 

解压

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mkdir clang
tar xzvf clang - r450784d1.tar.gz - C clang

编译使用pass实例

  1. 下载代码
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git clone https: / / github.com / LeadroyaL / llvm - pass - tutorial
  1. 修改 CMakeLists.txt，在project()后加上
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set (CMAKE_C_COMPILER / home / ylarod / ndk - r25c / clang / bin / clang)
set (CMAKE_CXX_COMPILER / home / ylarod / ndk - r25c / clang / bin / clang)
set (ENV{LLVM_HOME} / home / ylarod / ndk - r25c / clang)

这个时候cmake ..会报错

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CMake Error at / home / ylarod / ndk - r25c / clang / lib64 / cmake / llvm / LLVMExports.cmake: 1036 (message):
   The imported target "LLVMDemangle" references the file
 
      "/home/ylarod/ndk-r25c/clang/lib64/libLLVMDemangle.a"
 
   but this file does not exist.  Possible reasons include:
 
   * The file was deleted, renamed, or moved to another location.
 
   * An install or uninstall procedure did not complete successfully.
 
   * The installation package was faulty and contained
 
      "/home/ylarod/ndk-r25c/clang/lib64/cmake/llvm/LLVMExports.cmake"
 
   but not all the files it references.
 
Call Stack (most recent call first):
   / home / ylarod / ndk - r25c / clang / lib64 / cmake / llvm / LLVMConfig.cmake: 251 (include)
   CMakeLists.txt: 14 (find_package)

这个时候去注释掉clang/lib64/cmake/llvm/LLVMExports.cmake 下面这一段代码

 

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然后

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mkdir build && cd build
cmake .. - DCMAKE_BUILD_TYPE = Release - G Ninja
ninja

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测试代码来自

 

build.sh:

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export CC = / home / ylarod / Android / Sdk / ndk / 25.2 . 9519653 / toolchains / llvm / prebuilt / linux - x86_64 / bin / clang + +
 
$CC aes.cpp test.cpp - o no_obf
$CC - fpass - plugin = / home / ylarod / ndk - r25c / llvm - pass - tutorial / build / Hikari / libHikari.so - Xclang - load - Xclang / home / ylarod / ndk - r25c / llvm - pass - tutorial / build / Hikari / libHikari.so - mllvm - split_num = 3 - mllvm - fw_prob = 100 - mllvm - fw_times = 4 - mllvm - bcf_prob = 100 - mllvm - bcf_loop = 3 aes.cpp test.cpp - o obf

编译后：

 

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差不多鸟～

当我们来到macOS上

由于Google编译macOS工具链的系统版本太低，加载so的时候会报错

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In file included from aes.cpp: 1 :
. / aes.h: 6 : 10 : fatal error: 'cstring' file not found
#include <cstring>
          ^~~~~~~~~
1 error generated.
test.cpp: 1 : 10 : fatal error: 'cstdio' file not found
#include <cstdio>
          ^~~~~~~~
1 error generated.
error: unable to load plugin '/Users/ylarod/ndk-r25c/llvm-pass-tutorial/build/Hikari/libHikari.so' : 'dlopen(/Users/ylarod/ndk-r25c/llvm-pass-tutorial/build/Hikari/libHikari.so, 0x0009): symbol not found in flat namespace ' __ZN4llvm10CallbackVH6anchorEv''
clang (LLVM option parsing): Unknown command line argument '-split_num=3' .  Try: 'clang (LLVM option parsing) --help'
clang (LLVM option parsing): Did you mean '--print-bfi=3' ?
clang (LLVM option parsing): Unknown command line argument '-fw_prob=100' .  Try: 'clang (LLVM option parsing) --help'
clang (LLVM option parsing): Did you mean '--color=100' ?
clang (LLVM option parsing): Unknown command line argument '-fw_times=4' .  Try: 'clang (LLVM option parsing) --help'
clang (LLVM option parsing): Did you mean '--fast-isel=4' ?
clang (LLVM option parsing): Unknown command line argument '-bcf_prob=100' .  Try: 'clang (LLVM option parsing) --help'
clang (LLVM option parsing): Did you mean '--icp-lto=100' ?
clang (LLVM option parsing): Unknown command line argument '-bcf_loop=3' .  Try: 'clang (LLVM option parsing) --help'
clang (LLVM option parsing): Did you mean '--icp-lto=3' ?
error: unable to load plugin '/Users/ylarod/ndk-r25c/llvm-pass-tutorial/build/Hikari/libHikari.so' : 'dlopen(/Users/ylarod/ndk-r25c/llvm-pass-tutorial/build/Hikari/libHikari.so, 0x0009): symbol not found in flat namespace ' __ZN4llvm10CallbackVH6anchorEv''
clang (LLVM option parsing): Unknown command line argument '-split_num=3' .  Try: 'clang (LLVM option parsing) --help'
clang (LLVM option parsing): Did you mean '--print-bfi=3' ?
clang (LLVM option parsing): Unknown command line argument '-fw_prob=100' .  Try: 'clang (LLVM option parsing) --help'
clang (LLVM option parsing): Did you mean '--color=100' ?
clang (LLVM option parsing): Unknown command line argument '-fw_times=4' .  Try: 'clang (LLVM option parsing) --help'
clang (LLVM option parsing): Did you mean '--fast-isel=4' ?
clang (LLVM option parsing): Unknown command line argument '-bcf_prob=100' .  Try: 'clang (LLVM option parsing) --help'
clang (LLVM option parsing): Did you mean '--icp-lto=100' ?
clang (LLVM option parsing): Unknown command line argument '-bcf_loop=3' .  Try: 'clang (LLVM option parsing) --help'
clang (LLVM option parsing): Did you mean '--icp-lto=3' ?

解决办法：

 

使用下载的clang替换掉ndk里面的clang

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mv clang - 14 clang - 14.bak
cp ~ / ndk - r25c / clang / bin / clang - 14 clang - 14

找不到头文件是macOS的问题，修改 build.sh 为

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export CC = / Users / ylarod / Library / Android / sdk / ndk / 25.2 . 9519653 / toolchains / llvm / prebuilt / darwin - x86_64 / bin / aarch64 - linux - android33 - clang + +
 
$CC aes.cpp test.cpp - o no_obf
$CC - fpass - plugin = / Users / ylarod / ndk - r25c / llvm - pass - tutorial / build / Hikari / libHikari.so - Xclang - load - Xclang / Users / ylarod / ndk - r25c / llvm - pass - tutorial / build / Hikari / libHikari.so - mllvm - split_num = 3 - mllvm - fw_prob = 100 - mllvm - fw_times = 4 - mllvm - bcf_prob = 100 - mllvm - bcf_loop = 3 aes.cpp test.cpp - o obf

后重新编译，成功混淆

 

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参考

 

在我的博客中查看：



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