linux-kernel - Re: [RFC] Make Yama pid

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Date:	Wed, 23 Nov 2011 14:49:28 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Serge Hallyn <serge.hallyn@...onical.com>,
	Kees Cook <keescook@...omium.org>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	kernel-hardening@...ts.openwall.com
Subject: Re: [RFC] Make Yama pid_ns aware

Quoting Vasiliy Kulikov (segoon@...nwall.com):
> Actually, what concerns me is not ptrace, but symlink/hardling
> protection.  There is no interaction between namespaces in case of
> containers via symlinks in the basic case.  In case of ptrace I don't
> think the child ns may weaken the parent ns - child ns may not access
> processes of the parent namespace and everything it may ptrace is
> already inside of this ns.

Oh, yes.  If you're saying the symlink protection shouldn't be
per-pidns, I agree it seems an odd fit.

How about a version of this patch leaving symlink protection
out of pidns (maybe in user ns), and just putting ptrace
protection per-pidns?

-serge
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