[TOOL] Anti-Ptrace Linux LKM

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From: support@securiteam.com
To: list@securiteam.com
Date: 30 Mar 2003 15:57:17 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Anti-Ptrace Linux LKM
------------------------------------------------------------------------

DETAILS

The following Linux LKM allows an administrator to disable the ptrace
abilities under the 2.4.x kernels.

Tool source:
#!/bin/sh
# MAKE ME EXECUTABLE !!!
#
# root@Hogwarts:/home/sacrine/TEST# chmod +x anti-ptrace
# root@Hogwarts:/home/sacrine/TEST# ./anti-ptrace
# [+] making anti-ptrace.c: OK
# [+] compiling the script: OK
# [+] loading the module : OK
#

echo -n " [+] making anti-ptrace.c: "
cat > anti-ptrace.c <<NETRIC

/*
 * Noodoplossing voor de ptrace race vuln
 * anti-ptrace.c by sacrine
 * netric.org
 */

#define __KERNEL__
#define MODULE
#define LINUX

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/version.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/ctype.h>
#include <linux/tty.h>
#include <sys/syscall.h>

#include <linux/ptrace.h>

long (*o_ptrace) ( pid_t pid,
   void *addr,
   void *data );

extern void* sys_call_table[];

int anti_ptrace( pid_t pid,
   uid_t uid,
   void *addr,
   void *data )
{
   uid_t o_uid;

   if(current->uid == 0)
     {
 return(o_ptrace(pid,addr,data));
     }
   
   printk("warning: ptrace(); violation\n"
  "pid=[%i] uid=[%i]\n"
  ,current->pid
  ,current->uid);
   
   console_print("warning: non-root users are not allowed to use
ptrace();\n");
   return EPERM;
}

int init_module(void)
{
   o_ptrace=sys_call_table[SYS_ptrace];
   sys_call_table[SYS_ptrace]=anti_ptrace;
   
   printk("anti-ptrace kernel module loaded with pid=[%i]\n",
  current->pid);
   
   return(0);
}

void cleanup_module(void)
{
   sys_call_table[SYS_ptrace]=o_ptrace;
   printk("anti-ptrace kernel module ended with pid=[%i]\n",
  current->pid);
}

NETRIC
echo "OK";
echo -n " [+] compiling the script: ";
gcc -c anti-ptrace.c -I/lib/modules/$(uname -r)/build/include
echo "OK";
echo -n " [+] loading the module : ";
/sbin/insmod anti-ptrace.o >/dev/null
echo "OK";

# sacrine [Netric Security]

ADDITIONAL INFORMATION

The information has been provided by <mailto:sacrine@netric.org> sacrine.

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