Messages in this thread | | | Date | Tue, 12 Jul 2016 20:29:33 +0300 | From | Cyrill Gorcunov <> | Subject | Re: [PATCH] prctl: remove one-shot limitation for changing exe link |
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On Tue, Jul 12, 2016 at 11:52:09AM -0500, Eric W. Biederman wrote: > > > > Persistent exe-link doesn't guarantee anything if you have rights to ptrace > > task and inject own code into (from security POV). So lets rip it out. > > > > Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> > > I believe the original concern was someone injecting a code into a > process and playing silly buggers with the exe link. Someone who does > not have ptrace capability.
If you manage to inject code into a process, that's all, you're compromised, preventing changing exe-link several times wont help much I fear. Current limit -- one may change it once, Stas' patch simply removes this limitation. The ability to change it only _once_ may be suitable for some kind of monitor daemon I guess but this monitor should detect any change in exe-link state and notify node's admin, otherwise it's simply useless.
> It is completely not ok to change this until someone goes back to the > original conversation and looks at the original threat model, and > refutes it.
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