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

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Message-ID: <20121231211246.GA784@mail.hallyn.com>
Date:	Mon, 31 Dec 2012 21:12:46 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	Eric Paris <eparis@...hat.com>,
	Andrew Vagin <avagin@...allels.com>,
	Andrey Vagin <avagin@...nvz.org>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.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

Quoting Cyrill Gorcunov (gorcunov@...nvz.org):
> > 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;
> 
> If only I've not missed something obvious, the check for security_mmap_addr() here
> instead of poking the mmap_min_addr looks more correct for me. Andrew?

That sounds right to me as well.

-serge
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