linux-kernel - Re: [PATCH] prctl: fix validation of an address

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Date:	Tue, 1 Jan 2013 12:26:44 +0400
From:	Andrey Wagin <avagin@...il.com>
To:	Eric Paris <eparis@...hat.com>
Cc:	Andrew Vagin <avagin@...allels.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	James Morris <jmorris@...ei.org>
Subject: Re: [PATCH] prctl: fix validation of an address

>
> The kernel makes the decision on what is valid via security_mmap_addr().
> Assuming there are no security fears of an untrusted application
> tricking some priviledged application to set up these maps the answer is
> just calling security_mmap_addr() instead of doing if(addr <
> mmap_min_addr) return -EINVAL;
>
> I don't know if it is a good idea to allow this interface to ever go
> below mmap_min_addr, but I do know that using (or even thinking about)
> dac_mmap_min_addr is wrong and you should be looking at
> security_mmap_addr() if you look at anything...

This sounds reasonable. Thank you for the comments. I'm going to send
a second version of this patch.

>
> -Eric
>
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