linux-kernel - Re: [PATCH] Smack: fix domain transfer issues

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Date:	Thu, 29 Sep 2011 16:57:04 +0300 (EEST)
From:	Jarkko Sakkinen <jarkko.sakkinen@...el.com>
To:	Stephen Smalley <sds@...ho.nsa.gov>
cc:	Casey Schaufler <casey@...aufler-ca.com>,
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH] Smack: fix domain transfer issues

On Thu, 29 Sep 2011, Stephen Smalley wrote:

> On Thu, 2011-09-29 at 11:26 +0300, Jarkko Sakkinen wrote:
>> MNT_NOSUID should be checked.
>
> Doubtful, as Smack and capabilities are completely orthogonal, right?
> Even for SELinux, the nosuid check is a bit of a nuisance.

What I'm planning to do is to not switch
domain if filesystem is mounted with nosuid.
Same logic as prepare_binprm does for suid
and sgid bits.

>>  Also, I'll plan to
>> implement permission check for ptrace but in the
>> scope of this patch.
>
> Still no transition or entrypoint checks, open file revalidation, parent
> death signal clearing, ...?

I've already added death signal clearing to the
next-to-be-submitted revision of this patch.
I'm planning to implemented flushing of
non-permissible files and signals as two separate
patches later on (in the near future however).

/Jarkko
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