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: <CAObL_7EYb62o=a0ekzcDx=0TuN55A7aTYhLJbMNu2r8F0V77EA@mail.gmail.com>
Date:	Fri, 6 Apr 2012 13:01:17 -0700
From:	Andrew Lutomirski <luto@....edu>
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, 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 12:55 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.
>
> 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?

This has been bugging me for awhile.  Is there any interest in moving
the manpages into the kernel source tree?  Then there could be a
general requirement that new APIs get documented when they're written.

(There are plenty of barely- or incompletely-documented syscalls.
futex and relatives come to mind.)

--Andy
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