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Message-ID: <87blnb48a3.fsf@mid.deneb.enyo.de>
Date: Tue, 28 Apr 2020 23:20:20 +0200
From: Florian Weimer <fw@...eb.enyo.de>
To: Jann Horn <jannh@...gle.com>
Cc: Mickaël Salaün <mic@...ikod.net>, kernel list
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Subject: Re: [PATCH v3 0/5] Add support for RESOLVE_MAYEXEC
* Jann Horn:
> Just as a comment: You'd probably also have to use RESOLVE_MAYEXEC in
> the dynamic linker.
Absolutely. In typical configurations, the kernel does not enforce
that executable mappings must be backed by files which are executable.
It's most obvious with using an explicit loader invocation to run
executables on noexec mounts. RESOLVE_MAYEXEC is much more useful
than trying to reimplement the kernel permission checks (or what some
believe they should be) in userspace.
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