我正在查看堆溢出挑战(Protostar中的 heap3)的汇编代码,它使用旧版本dlmalloc的漏洞来执行漏洞利用。以下是汇编程序转储:
0x08048889 <main+0>: push ebp
0x0804888a <main+1>: mov ebp,esp
0x0804888c <main+3>: and esp,0xfffffff0
0x0804888f <main+6>: sub esp,0x20
0x08048892 <main+9>: mov DWORD PTR [esp],0x20
0x08048899 <main+16>: call 0x8048ff2 <malloc>
0x0804889e <main+21>: mov DWORD PTR [esp+0x14],eax
0x080488a2 <main+25>: mov DWORD PTR [esp],0x20
0x080488a9 <main+32>: call 0x8048ff2 <malloc>
0x080488ae <main+37>: mov DWORD PTR [esp+0x18],eax
0x080488b2 <main+41>: mov DWORD PTR [esp],0x20
0x080488b9 <main+48>: call 0x8048ff2 <malloc>
0x080488be <main+53>: mov DWORD PTR [esp+0x1c],eax
0x080488c2 <main+57>: mov eax,DWORD PTR [ebp+0xc]
0x080488c5 <main+60>: add eax,0x4
0x080488c8 <main+63>: mov eax,DWORD PTR [eax]
0x080488ca <main+65>: mov DWORD PTR [esp+0x4],eax
0x080488ce <main+69>: mov eax,DWORD PTR [esp+0x14]
0x080488d2 <main+73>: mov DWORD PTR [esp],eax
0x080488d5 <main+76>: call 0x8048750 <strcpy@plt>
0x080488da <main+81>: mov eax,DWORD PTR [ebp+0xc]
0x080488dd <main+84>: add eax,0x8
0x080488e0 <main+87>: mov eax,DWORD PTR [eax]
0x080488e2 <main+89>: mov DWORD PTR [esp+0x4],eax
0x080488e6 <main+93>: mov eax,DWORD PTR [esp+0x18]
0x080488ea <main+97>: mov DWORD PTR [esp],eax
0x080488ed <main+100>: call 0x8048750 <strcpy@plt>
0x080488f2 <main+105>: mov eax,DWORD PTR [ebp+0xc]
0x080488f5 <main+108>: add eax,0xc
0x080488f8 <main+111>: mov eax,DWORD PTR [eax]
0x080488fa <main+113>: mov DWORD PTR [esp+0x4],eax
0x080488fe <main+117>: mov eax,DWORD PTR [esp+0x1c]
0x08048902 <main+121>: mov DWORD PTR [esp],eax
0x08048905 <main+124>: call 0x8048750 <strcpy@plt>
0x0804890a <main+129>: mov eax,DWORD PTR [esp+0x1c]
0x0804890e <main+133>: mov DWORD PTR [esp],eax
0x08048911 <main+136>: call 0x8049824 <free>
0x08048916 <main+141>: mov eax,DWORD PTR [esp+0x18]
0x0804891a <main+145>: mov DWORD PTR [esp],eax
0x0804891d <main+148>: call 0x8049824 <free>
0x08048922 <main+153>: mov eax,DWORD PTR [esp+0x14]
0x08048926 <main+157>: mov DWORD PTR [esp],eax
0x08048929 <main+160>: call 0x8049824 <free>
0x0804892e <main+165>: mov DWORD PTR [esp],0x804ac27
0x08048935 <main+172>: call 0x8048790 <puts@plt>
0x0804893a <main+177>: leave
0x0804893b <main+178>: ret
End of assembler dump.
现在查看汇编程序转储,我可以理解的是malloc(),free()静态链接到二进制文件,而strcpy()和puts()使用 PLT 链接。
当我尝试使用它的源代码编译这个程序时,我得到malloc@plt和free@plt,在我的本地机器上编译时使用了错误版本的dlmalloc. 挑战被编译并放置在一个 Debian 发行版上,我们必须启动它才能尝试这个挑战,但我想在我的本地机器上尝试它。有人可以解释一下我将如何编译它malloc()并free()与二进制文件静态链接。