linux-kernel - Re: [PATCH 01/13] devpts: Teach /dev/ptmx to find the associated devpts via path lookup

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Message-ID: <186305CD-6D16-494A-B76E-299E1A85CF7A@zytor.com>
Date:	Mon, 11 Apr 2016 07:48:28 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>
CC:	security@...ian.org, security@...nel.org,
	Al Viro <viro@...iv.linux.org.uk>,
	"security@...ntu.com >> security" <security@...ntu.com>,
	Peter Hurley <peter@...leysoftware.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Willy Tarreau <w@....eu>,
	Aurelien Jarno <aurelien@...el32.net>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Jann Horn <jann@...jh.net>, Greg KH <greg@...ah.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jslaby@...e.com>, Florian Weimer <fw@...eb.enyo.de>
Subject: Re: [PATCH 01/13] devpts: Teach /dev/ptmx to find the associated devpts via path lookup

On April 9, 2016 6:27:36 PM PDT, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>On Apr 9, 2016 5:45 PM, "Andy Lutomirski" <luto@...capital.net> wrote:
>>
>>
>> What we *do* want to do, though, is to prevent the following:
>
>I don't see the point. Why do you bring up this insane scenario that
>nobody
>can possibly care about?
>
>So you actually have any reason to believe somebody does that?
>
>I already asked about that earlier, and the silence was deafening.
>
>    Linus

Here is an entire different approach, I don't know if it is sane or not: when *mounting* the devpts filesystem, it could automagically create the bins mount for ptmx in the parent of its mount point.  Presumably the would be a mount option to disable that behavior.

Does anyone see an obvious problem with that?
-- 
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