[coLinux-users] Problem with ptrace protection in Ubuntu

[Alexander K. <kri...@fr...>]

Hi.

I am running andLinux/coLinux:

$ uname -a
Linux andLinux 2.6.33.7-co-0.7.10-r1588 #1 PREEMPT Mon Aug 8 04:13:31 UTC 2011 i686 athlon i386 GNU/Linux

But...

$ cat /etc/motd | head -n 1
Welcome to Ubuntu 11.10 (GNU/Linux 2.6.33.7-co-0.7.10-r1588 i686)

Now the problem is so-called "ptrace protection", explained there:
https://wiki.edubuntu.org/SecurityTeam/Roadmap/KernelHardening#ptrace_Protection

I tried to use tools like reptyr and injcode:
https://github.com/nelhage/reptyr#readme
https://github.com/ThomasHabets/injcode#readme

Both of them do not work as expected. My suspicion is that this is due to my combination of coLinux kernel (without yama) and new Ubuntu (relying on yama). I tried to run the tools as root (sudo -i) because I expected ptrace protection to be inactive according to the description at Ubuntu, but to no avail.

My questions are:
  1) Can you confirm that my suscpcion is correct?
    2a) If not, what else might be the reason for my problems?
    2b) If so, is there anything I can do about it like downloading a coLinux kernel with built-in yama support from somewhere or asking you to build in yama protection in the future?

Disclaimer: Maybe I am not asking the right questions. Please note that I am a user, not a kernel hacker.

Any help is appreciated. Thanks in advance.
--
Alexander Kriegisch (kriegaex)
http://freetz.org