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Date: Wed, 12 Dec 2018 16:29:47 +0000
From: Jordan Glover <Golden_Miller83@...tonmail.ch>
To: Mickaël Salaün <mic@...ikod.net>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Al Viro <viro@...iv.linux.org.uk>, James Morris <jmorris@...ei.org>, Jonathan Corbet <corbet@....net>, Kees Cook <keescook@...omium.org>, Matthew Garrett <mjg59@...gle.com>, Michael Kerrisk <mtk.manpages@...il.com>, Mickaël Salaün <mickael.salaun@....gouv.fr>, Mimi Zohar <zohar@...ux.ibm.com>, Philippe Trébuchet <philippe.trebuchet@....gouv.fr>, Shuah Khan <shuah@...nel.org>, Thibaut Sautereau <thibaut.sautereau@....gouv.fr>, Vincent Strubel <vincent.strubel@....gouv.fr>, Yves-Alexis Perez <yves-alexis.perez@....gouv.fr>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, "linux-api@...r.kernel.org" <linux-api@...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: [RFC PATCH v1 0/5] Add support for O_MAYEXEC
On Wednesday, December 12, 2018 9:17 AM, Mickaël Salaün <mic@...ikod.net> wrote:
> Hi,
>
> The goal of this patch series is to control script interpretation. A
> new O_MAYEXEC flag used by sys_open() is added to enable userland script
> interpreter to delegate to the kernel (and thus the system security
> policy) the permission to interpret scripts or other files containing
> what can be seen as commands.
>
> The security policy is the responsibility of an LSM. A basic
> system-wide policy is implemented with Yama and configurable through a
> sysctl.
>
> The initial idea come from CLIP OS and the original implementation has
> been used for more than 10 years:
> https://github.com/clipos-archive/clipos4_doc
>
> An introduction to O_MAYEXEC was given at the Linux Security Summit
> Europe 2018 - Linux Kernel Security Contributions by ANSSI:
> https://www.youtube.com/watch?v=chNjCRtPKQY&t=17m15s
> The "write xor execute" principle was explained at Kernel Recipes 2018 -
> CLIP OS: a defense-in-depth OS:
> https://www.youtube.com/watch?v=PjRE0uBtkHU&t=11m14s
>
> This patch series can be applied on top of v4.20-rc6. This can be
> tested with CONFIG_SECURITY_YAMA. I would really appreciate
> constructive comments on this RFC.
>
> Regards,
>
Are various interpreters upstreams interested in adding support
for O_MAYEXEC if it land in kernel? Did you contacted them about this?
Jordan
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