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Date: Tue, 13 Jun 2017 18:35:45 +0200
From: Florian Weimer <fweimer@...hat.com>
To: oss-security@...ts.openwall.com, Fiedler Roman <Roman.Fiedler@....ac.at>
Subject: Re: Vixie/ISC Cron group crontab to root escalation
On 06/13/2017 02:32 PM, Fiedler Roman wrote:
> Well, partially: what O_PATH can do, you could also do before O_PATH using
> repeated single-level open(NO_FOLLOW)/fstat-checks. So you had to do all the
> verification by yourself.
That's not completely accurate because open/close on device nodes can
have side effects (the classic example is a rewinding tape device).
O_PATH gives you an opportunity to perform these policy checks before
the side effect happens.
Florian
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