Analysis of a.tgz

[kmaster@christophe sotm29]$ tar tvzf a.tgz
-rwxrwxr-x root/root     18199 2003-03-18 21:48:04 x
[kmaster@christophe sotm29]$ strings x
[-] Unable to read /proc/self/exe
[-] Unable to write shellcode
[+] Signal caught
[-] Unable to read registers
[+] Shellcode placed at 0x%08lx
[+] Now wait for suid shell...
[-] Unable to detach from victim
[-] Fatal error
[-] Unable to attach
[+] Attached to %d
[-] Unable to setup syscall trace
[+] Waiting for signal
[-] Unable to stat myself
[-] Unable to spawn shell
[-] Unable to fork

Linux kernel ptrace/kmod local root exploit from Wojciech Purczynski ptrace.c