Re: Vixie/ISC Cron group crontab to root escalation

[Florian Weimer <fweimer () redhat com>]

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