netdev - Re: [PATCH v17 01/15] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve from granting privs

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Message-Id: <20120406125517.77133b4e.akpm@linux-foundation.org>
Date:	Fri, 6 Apr 2012 12:55:17 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Will Drewry <wad@...omium.org>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.com,
	netdev@...r.kernel.org, x86@...nel.org, arnd@...db.de,
	davem@...emloft.net, hpa@...or.com, mingo@...hat.com,
	oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
	mcgrathr@...omium.org, tglx@...utronix.de, luto@....edu,
	eparis@...hat.com, serge.hallyn@...onical.com, djm@...drot.org,
	scarybeasts@...il.com, indan@....nu, pmoore@...hat.com,
	corbet@....net, eric.dumazet@...il.com, markus@...omium.org,
	coreyb@...ux.vnet.ibm.com, keescook@...omium.org,
	jmorris@...ei.org, Andy Lutomirski <luto@...capital.net>,
	linux-man@...r.kernel.org
Subject: Re: [PATCH v17 01/15] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent
 execve from granting privs

On Thu, 29 Mar 2012 15:01:46 -0500
Will Drewry <wad@...omium.org> wrote:

> From: Andy Lutomirski <luto@...capital.net>
> 
> With this set, a lot of dangerous operations (chroot, unshare, etc)
> become a lot less dangerous because there is no possibility of
> subverting privileged binaries.

The changelog doesn't explain the semantics of the new syscall. 
There's a comment way-down-there which I guess suffices, if you hunt
for it.

And the changelog doesn't explain why this is being added.  Presumably
seccomp_filter wants/needs this feature but whowhatwherewhenwhy?  Spell
it all out, please.

The new syscall mode will be documented in the prctl manpage.  Please
cc linux-man@...r.kernel.org and work with Michael on getting this
done?

>
> ...
>
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