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Message-ID: <202007160957.CABE4CC@keescook>
Date: Thu, 16 Jul 2020 12:12:47 -0700
From: Kees Cook <keescook@...omium.org>
To: Mickaël Salaün <mic@...ikod.net>
Cc: linux-kernel@...r.kernel.org, Aleksa Sarai <cyphar@...har.com>,
Alexei Starovoitov <ast@...nel.org>,
Al Viro <viro@...iv.linux.org.uk>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Lutomirski <luto@...nel.org>,
Christian Brauner <christian.brauner@...ntu.com>,
Christian Heimes <christian@...hon.org>,
Daniel Borkmann <daniel@...earbox.net>,
Deven Bowers <deven.desai@...ux.microsoft.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Eric Biggers <ebiggers@...nel.org>,
Eric Chiang <ericchiang@...gle.com>,
Florian Weimer <fweimer@...hat.com>,
James Morris <jmorris@...ei.org>, Jan Kara <jack@...e.cz>,
Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>,
Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
Matthew Garrett <mjg59@...gle.com>,
Matthew Wilcox <willy@...radead.org>,
Michael Kerrisk <mtk.manpages@...il.com>,
Mickaël Salaün <mickael.salaun@....gouv.fr>,
Mimi Zohar <zohar@...ux.ibm.com>,
Philippe Trébuchet <philippe.trebuchet@....gouv.fr>,
Scott Shell <scottsh@...rosoft.com>,
Sean Christopherson <sean.j.christopherson@...el.com>,
Shuah Khan <shuah@...nel.org>, Steve Dower <steve.dower@...hon.org>,
Steve Grubb <sgrubb@...hat.com>,
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
Thibaut Sautereau <thibaut.sautereau@....gouv.fr>,
Vincent Strubel <vincent.strubel@....gouv.fr>,
kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org,
linux-integrity@...r.kernel.org,
linux-security-module@...r.kernel.org,
linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v6 7/7] ima: add policy support for the new file open
MAY_OPENEXEC flag
On Thu, Jul 16, 2020 at 04:40:15PM +0200, Mickaël Salaün wrote:
>
> On 15/07/2020 22:40, Kees Cook wrote:
> > On Tue, Jul 14, 2020 at 08:16:38PM +0200, Mickaël Salaün wrote:
> >> From: Mimi Zohar <zohar@...ux.ibm.com>
> >>
> >> The kernel has no way of differentiating between a file containing data
> >> or code being opened by an interpreter. The proposed O_MAYEXEC
> >> openat2(2) flag bridges this gap by defining and enabling the
> >> MAY_OPENEXEC flag.
> >>
> >> This patch adds IMA policy support for the new MAY_OPENEXEC flag.
> >>
> >> Example:
> >> measure func=FILE_CHECK mask=^MAY_OPENEXEC
> >> appraise func=FILE_CHECK appraise_type=imasig mask=^MAY_OPENEXEC
> >>
> >> Signed-off-by: Mimi Zohar <zohar@...ux.ibm.com>
> >> Reviewed-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
> >> Acked-by: Mickaël Salaün <mic@...ikod.net>
> >
> > (Process nit: if you're sending this on behalf of another author, then
> > this should be Signed-off-by rather than Acked-by.)
>
> I'm not a co-author of this patch.
Correct, but you are part of the delivery path to its entry to the
tree. If you were co-author, you would include "Co-developed-by" with
a Signed-off-by. (So my nit stands)
For excruciating details:
https://www.kernel.org/doc/html/latest/process/submitting-patches.html#when-to-use-acked-by-cc-and-co-developed-by
"The Signed-off-by: tag indicates that the signer was ... in the patch’s
delivery path."
"Co-developed-by: ... is a used to give attribution to co-authors ..."
--
Kees Cook
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