linux-kernel - Re: [PATCH] devpts: Sensible /dev/ptmx & force newinstance

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Date:	Mon, 21 Dec 2015 14:23:04 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Peter Hurley <peter@...leysoftware.com>,
	Greg KH <greg@...ah.com>, Jiri Slaby <jslaby@...e.com>,
	Aurelien Jarno <aurelien@...el32.net>,
	Andy Lutomirski <luto@...capital.net>,
	Florian Weimer <fw@...eb.enyo.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Jann Horn <jann@...jh.net>,
	"security@...nel.org" <security@...nel.org>,
	"security@...ntu.com >> security" <security@...ntu.com>,
	security@...ian.org, Willy Tarreau <w@....eu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] devpts: Sensible /dev/ptmx & force newinstance

On Mon, Dec 21, 2015 at 2:03 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
>
> What actually breaks is "echo NNN > /proc/sys/kernel/pty/reserve"
> Which allows the primary instance of devpts to have access to more
> ptys than any other instance.

Ok. We'll probably need to fix that similarly (make it look up
/dev/pts to figure out *which* pty reserve to fix), but I think that's
entirely separate from the ptmx issue for now.

                 Linus
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