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Date: Mon, 21 Dec 2015 14:23:04 -0800
Message-ID: <CA+55aFxiT858VPCP5-Azbt8Oau4zDi0GrroukjUQ+80JTCWokQ@mail.gmail.com>
Subject: Re: [PATCH] devpts: Sensible /dev/ptmx & force newinstance
From: Linus Torvalds <torvalds@linux-foundation.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Peter Hurley <peter@hurleysoftware.com>,
        Greg KH <greg@kroah.com>, Jiri Slaby <jslaby@suse.com>,
        Aurelien Jarno <aurelien@aurel32.net>,
        Andy Lutomirski <luto@amacapital.net>,
        Florian Weimer <fw@deneb.enyo.de>, Al Viro <viro@zeniv.linux.org.uk>,
        Serge Hallyn <serge.hallyn@ubuntu.com>, Jann Horn <jann@thejh.net>,
        "security@kernel.org" <security@kernel.org>,
        "security@ubuntu.com >> security" <security@ubuntu.com>,
        security@debian.org, Willy Tarreau <w@1wt.eu>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Mon, Dec 21, 2015 at 2:03 PM, Eric W. Biederman
<ebiederm@xmission.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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