linux-kernel - Re: [RFC][PATCH v2] procfs: Always expose /proc/<pid>/map

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Message-Id: <20150126225023.df63f6ca.akpm@linux-foundation.org>
Date:	Mon, 26 Jan 2015 22:50:23 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Calvin Owens <calvinowens@...com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Peter Feiner <pfeiner@...gle.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Siddhesh Poyarekar <siddhesh.poyarekar@...il.com>,
	linux-kernel@...r.kernel.org, kernel-team@...com,
	Pavel Emelyanov <xemul@...nvz.org>, linux-api@...r.kernel.org,
	Kees Cook <keescook@...omium.org>
Subject: Re: [RFC][PATCH v2] procfs: Always expose /proc/<pid>/map_files/
 and make it readable

On Tue, 27 Jan 2015 09:46:47 +0300 Cyrill Gorcunov <gorcunov@...il.com> wrote:

> > There's one other problem here: we're assuming that the map_files
> > implementation doesn't have bugs.  If it does have bugs then relaxing
> > permissions like this will create new vulnerabilities.  And the
> > map_files implementation is surprisingly complex.  Is it bug-free?
> 
> I didn't find any bugs in map-files (and we use it for long time already)
> so I think it is safe.

You've been using map_files the way it was supposed to be used so no,
any bugs won't show up.  What happens if you don your evil black hat
and use map_files in ways that weren't anticipated?  Attack it?

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