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Date: Fri, 06 Sep 2019 17:56:32 +0200
From: Florian Weimer <fweimer@...hat.com>
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>, Andy
Lutomirski <luto@...nel.org>, Christian Heimes <christian@...hon.org>,
Daniel Borkmann <daniel@...earbox.net>, Eric Chiang
<ericchiang@...gle.com>, James Morris <jmorris@...ei.org>, Jan Kara
<jack@...e.cz>, Jann Horn <jannh@...gle.com>, Jonathan Corbet
<corbet@....net>, Kees Cook <keescook@...omium.org>, 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>, Song
Liu <songliubraving@...com>, Steve Dower <steve.dower@...hon.org>, Steve
Grubb <sgrubb@...hat.com>, 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,
linux-api@...r.kernel.org, linux-security-module@...r.kernel.org,
linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] fs: Add support for an O_MAYEXEC flag on sys_open()
Let's assume I want to add support for this to the glibc dynamic loader,
while still being able to run on older kernels.
Is it safe to try the open call first, with O_MAYEXEC, and if that fails
with EINVAL, try again without O_MAYEXEC?
Or do I risk disabling this security feature if I do that?
Do we need a different way for recognizing kernel support. (Note that
we cannot probe paths in /proc for various reasons.)
Thanks,
Florian
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