From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 12 Dec 2018 16:29:47 +0000 From: Jordan Glover Subject: Re: [RFC PATCH v1 0/5] Add support for O_MAYEXEC Message-ID: In-Reply-To: <20181212081712.32347-1-mic@digikod.net> References: <20181212081712.32347-1-mic@digikod.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable To: =?UTF-8?Q?Micka=C3=ABl_Sala=C3=BCn?= Cc: "linux-kernel@vger.kernel.org" , Al Viro , James Morris , Jonathan Corbet , Kees Cook , Matthew Garrett , Michael Kerrisk , =?UTF-8?Q?Micka=C3=ABl_Sala=C3=BCn?= , Mimi Zohar , =?UTF-8?Q?Philippe_Tr=C3=A9buchet?= , Shuah Khan , Thibaut Sautereau , Vincent Strubel , Yves-Alexis Perez , "kernel-hardening@lists.openwall.com" , "linux-api@vger.kernel.org" , "linux-security-module@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" List-ID: On Wednesday, December 12, 2018 9:17 AM, Micka=C3=ABl Sala=C3=BCn 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=3DchNjCRtPKQY&t=3D17m15s > The "write xor execute" principle was explained at Kernel Recipes 2018 - > CLIP OS: a defense-in-depth OS: > https://www.youtube.com/watch?v=3DPjRE0uBtkHU&t=3D11m14s > > 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