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Date: Thu, 13 Dec 2018 06:13:39 +0100
From: Florian Weimer <>
To: James Morris <>
Cc: Mickaël Salaün <>,,  Al Viro <>,
  Jonathan Corbet <>,  Kees Cook <>,
  Matthew Garrett <>,  Michael Kerrisk
 <>,  Mickaël Salaün
 <>,  Mimi Zohar <>,  Philippe
 Trébuchet <>,  Shuah Khan
 <>,  Thibaut Sautereau <>,
  Vincent Strubel <>,  Yves-Alexis Perez
Subject: Re: [RFC PATCH v1 0/5] Add support for O_MAYEXEC

* James Morris:

> On Wed, 12 Dec 2018, Florian Weimer wrote:
>> * James Morris:
>> > If you're depending on the script interpreter to flag that the user may 
>> > execute code, this seems to be equivalent in security terms to depending 
>> > on the user.  e.g. what if the user uses ptrace and clears O_MAYEXEC?
>> The argument I've heard is this: Using ptrace (and adding the +x
>> attribute) are auditable events.
> I guess you could also preload a modified libc which strips the flag.

My understanding is that this new libc would have to come somewhere, and
making it executable would be an auditable even as well.


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