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

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Message-ID: <CABqD9hbTWQ6uBn_jZ7WdbaAMtAcTHz3hWSer_tnAFU9iV-4GSQ@mail.gmail.com>
Date: Tue, 10 Apr 2012 14:03:49 -0500
From: Will Drewry <wad@...omium.org>
To: Andrew Morton <akpm@...ux-foundation.org>, Andrew Lutomirski <luto@....edu>
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, 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 Fri, Apr 6, 2012 at 2:55 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.
>
> 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.

I'll bubble up luto's comment into the changelog when I resend the
grand-unified-patchset.

> 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.

I'll try my hand at that and luto@ can yell at me if I misrepresent.
Seem reasonable?

> 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?

I'll add linux-man to the patch series since this applies to both
no_new_privs and seccomp filter.

Thanks!

>>
>> ...
>>

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