[TOOL] Anti-Ptrace Linux LKM

From: support@securiteam.com
Date: 03/30/03

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

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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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