Re: [PATCH] Security: Add prctl(PR_{GET,SET}_NETWORK) interface.

Andi Kleen
2009-12-16T15:59:44Z

On Wed, Dec 16, 2009 at 10:32:43AM -0500, Michael Stone wrote:
> Daniel Bernstein has observed [1] that security-conscious userland processes
> may benefit from the ability to irrevocably remove their ability to create,
> bind, connect to, or send messages except in the case of previously connected
> sockets or AF_UNIX filesystem sockets. We provide this facility by implementing
> support for a new prctl(PR_SET_NETWORK) flag named PR_NETWORK_OFF.
>
> This facility is particularly attractive to security platforms like OLPC
> Bitfrost [2] and to isolation programs like Rainbow [3] and Plash [4].

What would stop them from ptracing someone else running under the same
uid who still has the network access? If you ptrace you can do
arbitary system calls.

-Andi

--
ak@linux.intel.com -- Speaking for myself only.