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Date: Tue, 28 Nov 2017 12:11:34 -0800
From: Kees Cook <keescook@...omium.org>
To: "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc: Djalal Harouni <tixxdz@...il.com>, Andy Lutomirski <luto@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>, James Morris <james.l.morris@...cle.com>,
Ben Hutchings <ben.hutchings@...ethink.co.uk>, Solar Designer <solar@...nwall.com>,
Serge Hallyn <serge@...lyn.com>, Jessica Yu <jeyu@...nel.org>,
Rusty Russell <rusty@...tcorp.com.au>, LKML <linux-kernel@...r.kernel.org>,
linux-security-module <linux-security-module@...r.kernel.org>, kernel-hardening@...ts.openwall.com,
Jonathan Corbet <corbet@....net>, Ingo Molnar <mingo@...nel.org>,
"David S. Miller" <davem@...emloft.net>, Network Development <netdev@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>, Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v5 next 1/5] modules:capabilities: add request_module_cap()
On Tue, Nov 28, 2017 at 11:14 AM, Luis R. Rodriguez <mcgrof@...nel.org> wrote:
> kmod is just a helper to poke userpsace to load a module, that's it.
>
> The old init_module() and newer finit_module() do the real handy work or
> module loading, and both currently only use may_init_module():
>
> static int may_init_module(void)
> {
> if (!capable(CAP_SYS_MODULE) || modules_disabled)
> return -EPERM;
>
> return 0;
> }
>
> This begs the question:
>
> o If userspace just tries to just use raw finit_module() do we want similar
> checks?
>
> Otherwise, correct me if I'm wrong this all seems pointless.
Hm? That's direct-loading, not auto-loading. This series is only about
auto-loading.
We already have a global sysctl for blocking direct-loading (modules_disabled).
> If we want something similar I think we might need to be processing aliases and
> check for the aliases for their desired restrictions on finit_module(),
We don't need to handle aliases.
-Kees
--
Kees Cook
Pixel Security
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