linux-kernel - Re: [RFC PATCH] Fix: module signature vs tracepoints: add new TAINT_UNSIGNED

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Message-ID: <1583293363.24361.1392304214094.JavaMail.zimbra@efficios.com>
Date:	Thu, 13 Feb 2014 15:10:14 +0000 (UTC)
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	David Howells <dhowells@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [RFC PATCH] Fix: module signature vs tracepoints: add new
 TAINT_UNSIGNED_MODULE

----- Original Message -----
> From: "Steven Rostedt" <rostedt@...dmis.org>
> To: "Ingo Molnar" <mingo@...nel.org>
> Cc: "Mathieu Desnoyers" <mathieu.desnoyers@...icios.com>, linux-kernel@...r.kernel.org, "Ingo Molnar"
> <mingo@...hat.com>, "Thomas Gleixner" <tglx@...utronix.de>, "Rusty Russell" <rusty@...tcorp.com.au>, "David Howells"
> <dhowells@...hat.com>, "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
> Sent: Tuesday, February 11, 2014 11:45:34 PM
> Subject: Re: [RFC PATCH] Fix: module signature vs tracepoints: add new TAINT_UNSIGNED_MODULE
> 
> 
[...]
> But if the kernel expects to have signed modules, and you force a
> module to be loaded that is not signed, then you still get that
> "forced" module taint, which is the same one as loading a module from
> an older kernel into a newer kernel. It's a different problem, and I
> can see having a different taint flag be more informative to kernel
> developers in general. I would welcome that change with or without
> letting tracepoints be set for that module.

There is one important inaccuracy in your explanation above: a
kernel supporting signed modules, but not enforcing "sig_force",
can load unsigned modules with a simple modprobe or insmod, without
any "--force" argument. Therefore, tainting the module as
"TAINT_FORCED_MODULE" is misleading.

Thanks,

Mathieu


-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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