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Message-ID: <20170613112638.axsgfjy5ntrzylb3@jwilk.net>
Date: Tue, 13 Jun 2017 13:26:38 +0200
From: Jakub Wilk <jwilk@...lk.net>
To: oss-security@...ts.openwall.com
Subject: Re: Vixie/ISC Cron group crontab to root escalation
* Fiedler Roman <Roman.Fiedler@....ac.at>, 2017-06-13, 07:45:
>>>Thanks, perhaps a comment in the code can't hurt...
>>>Or even O_NODEV which does not exist, or O_PATH (linux only)..
>>
>>As there is a O_DIRECTORY it would be more orthogonal to have O_REGULAR (open
>>only a regular file). But that becomes more and more icky as we're running
>>out of 32 bits of O_*)
>
>Why not stop that at all and have an O_POLICY,
With help of O_PATH, you can implement almost any sanity check in userspace.
No need to reinvent this particular wheel.
--
Jakub Wilk
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