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Date: Tue, 16 Apr 2019 13:49:39 +0200
From: Florian Weimer <>
To: Steve Grubb <>
Cc: Jan Kara <>,  Mickaël Salaün
 <>,,  Al Viro
 <>,  James Morris <>,  Jonathan
 Corbet <>,  Kees Cook <>,  Matthew
 Garrett <>,  Michael Kerrisk <>,
  Mickaël Salaün <>,  Mimi
 Zohar <>,  Philippe Trébuchet
 <>,  Shuah Khan <>,  Thibaut
 Sautereau <>,  Vincent Strubel
 <>,  Yves-Alexis Perez
 <>,,,,,  Matthew Bobrowski
Subject: Re: [RFC PATCH v1 1/5] fs: Add support for an O_MAYEXEC flag on sys_open()

* Steve Grubb:

> This flag that is being proposed means that you would have to patch all 
> interpreters to use it. If you are sure that upstreams will accept that, why 
> not just change the policy to interpreters shouldn't execute anything unless 
> the execute bit is set? That is simpler and doesn't need a kernel change. And 
> setting the execute bit is an auditable event.

I think we need something like O_MAYEXEC so that security policies can
be enforced and noexec mounts can be detected.  I don't think it's a
good idea to do this in userspace, especially the latter.


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