linux-kernel - Re: [PATCH v3] fs: introduce pipe-only dump mode suid

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Message-Id: <20120622145711.d7f720cd.akpm@linux-foundation.org>
Date:	Fri, 22 Jun 2012 14:57:11 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	linux-kernel@...r.kernel.org, Alan Cox <alan@...ux.intel.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Rob Landley <rob@...dley.net>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Doug Ledford <dledford@...hat.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Joe Korty <joe.korty@...r.com>,
	David Howells <dhowells@...hat.com>,
	James Morris <james.l.morris@...cle.com>,
	linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v3] fs: introduce pipe-only dump mode suid_dumpable=3

On Fri, 22 Jun 2012 14:51:54 -0700
Kees Cook <keescook@...omium.org> wrote:

> > And how serious is the security vulnerability, in real-world terms?
> > Serious enough to risk this amount of bustage?
> 
> If they're running in mode "2" and they do not have a coredump pipe
> handler defined, local users can gain root access.

But the kernel can detect this case and avoid it?  If we do that at the same
time, we can avoid any mode=2 non-back-compatible breakage?
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