mirror of
https://github.com/rapid7/metasploit-framework
synced 2024-11-05 14:57:30 +01:00
39 lines
1009 B
C
39 lines
1009 B
C
/*
|
|
* outputs a cpuid key for use in context keyed payload encoding.
|
|
*
|
|
* Author: Dimitris Glynos <dimitris at census-labs.com>
|
|
*/
|
|
|
|
|
|
#include <stdio.h>
|
|
|
|
int main()
|
|
{
|
|
unsigned long eax;
|
|
|
|
asm (
|
|
"xorl %%esi, %%esi;" /* esi is key store, zero it out */
|
|
"xorl %%edi, %%edi;" /* edi is loop iterator, ditto */
|
|
"cpuid_loop: movl %%edi, %%eax;" /* iterator is first arg
|
|
to cpuid */
|
|
"xorl %%ecx, %%ecx;" /* ecx is also used as arg to cpuid but
|
|
we'll use it always as zero */
|
|
"cpuid;"
|
|
"xorl %%eax, %%esi;"
|
|
"cmpl %%esi, %%eax;" /* first time round esi = eax */
|
|
/* not very safe heh? */
|
|
"jne not_first_time;"
|
|
"leal 0x1(%%eax, 1), %%edi;" /* first time round ... */
|
|
"not_first_time: xorl %%ebx, %%esi;"
|
|
"xorl %%ecx, %%esi;"
|
|
"xorl %%edx, %%esi;"
|
|
"subl $1, %%edi;"
|
|
"jne cpuid_loop;"
|
|
"movl %%esi, %%eax;"
|
|
: "=a" (eax)
|
|
);
|
|
|
|
printf("%#.8lx\n", eax);
|
|
return 0;
|
|
}
|