Re: [RFC PATCH v1 0/5] Add support for O_MAYEXEC

From: James Morris
Date: Wed Dec 12 2018 - 18:41:01 EST

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.

James Morris