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

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Message-ID: <CALCETrWJc83uy6Y+mLLMPKtxkBW2cWf4g1D+3M-0qgTfcnV1Bg@mail.gmail.com>
Date:	Fri, 6 Apr 2012 12:55:14 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Will Drewry <wad@...omium.org>, 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
Subject: Re: [PATCH v17 01/15] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve
 from granting privs

On Fri, Apr 6, 2012 at 12:49 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> 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.
>>
>> This patch completely breaks apparmor.  Someone who understands (and
>> uses) apparmor should fix it or at least give me a hint.
>
> So [patch 2/15] fixes all this up?
>
> I guess we should join the two patches into one, to avoid a silly
> breakage window.  That means that John loses a brownie point, but we
> can mention him in the changelog, include his signed-off-by:

Or just fix the commit message.  It no longer completely breaks
AppArmor.  It just causes execve to fail when PR_SET_NO_NEW_PRIVS is
set and AppArmor is in use.

--Andy
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