linux-kernel - RE: [PATCH v7 0/7] Add support for O

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Date:   Mon, 10 Aug 2020 22:09:09 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Al Viro' <viro@...iv.linux.org.uk>,
        Mickaël Salaün <mic@...ikod.net>
CC:     Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Aleksa Sarai <cyphar@...har.com>,
        "Alexei Starovoitov" <ast@...nel.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>,
        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@...p-os.org>,
        Vincent Strubel <vincent.strubel@....gouv.fr>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: RE: [PATCH v7 0/7] Add support for O_MAYEXEC

> On Mon, Aug 10, 2020 at 10:11:53PM +0200, Mickaël Salaün wrote:
> > It seems that there is no more complains nor questions. Do you want me
> > to send another series to fix the order of the S-o-b in patch 7?
> 
> There is a major question regarding the API design and the choice of
> hooking that stuff on open().  And I have not heard anything resembling
> a coherent answer.

To me O_MAYEXEC is just the wrong name.
The bit would be (something like) O_INTERPRET to indicate
what you want to do with the contents.

The kernel 'policy' then decides whether that needs 'r-x'
access or whether 'r--' access in enough.

I think that is what you 100 line comment in 0/n means.

	David

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