From: Linus Torvalds <torvalds@linux-foundation.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Stefan Lippers-Hollmann <s.l-h@gmx.de>,
Christian Brauner <christian.brauner@canonical.com>,
Christian Brauner <christian.brauner@ubuntu.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"Serge E. Hallyn" <serge@hallyn.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Thorsten Leemhuis <regressions@leemhuis.info>
Subject: Re: [PATCH 0/1] devpts: use dynamic_dname() to generate proc name
Date: Wed, 23 Aug 2017 19:01:10 -0700 [thread overview]
Message-ID: <CA+55aFwvwtFCH2THn1LirOpMsZ57pnNi61nXQfQ6NBgakdXpTQ@mail.gmail.com> (raw)
In-Reply-To: <CA+55aFw737C9OVC2nQgGcazhi7Ca2K-frzgN2MiD=XqqFAp8YA@mail.gmail.com>
On Wed, Aug 23, 2017 at 6:49 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> Argh. And it's *not* fairly straightforward, because the
> tty_operations "ioctl()" function pointer only gets 'struct tty *'.
>
> So in the TIOCGPTPEER path, we don't actually have access to the file
> pointer of the fd we're doing the ioctl on.
>
> And that's where the 'struct path' to the 'ptmx' node is - which we
> need to then look up the 'pts' directory.
>
> How very annoying. I think that's why we did it all at ptmx_open()
> time, because then we had all the information.
Anyway, the revert is pushed out. So we're back to the old behavior
that gives the wrong pathname in /proc.
And I think I can handle the lack of a 'struct file *' to the ioctl
operations by just special-casing TIOCGPTPEER directly in tty_ioctl()
itself.
That's where we handle "generic" tty ioctls, and doing pty stuff there
is kind of wrong, but pty's are special.
But I think I'll leave it for tomorrow. So Eric, if you feel like
looking at this, I'd appreciate it.
Linus
next prev parent reply other threads:[~2017-08-24 2:01 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-16 17:12 [PATCH 0/1] devpts: use dynamic_dname() to generate proc name Christian Brauner
2017-08-16 17:12 ` [PATCH 1/1] " Christian Brauner
2017-08-16 18:26 ` [PATCH 0/1] " Linus Torvalds
2017-08-16 18:48 ` Linus Torvalds
2017-08-16 19:48 ` Christian Brauner
2017-08-16 19:56 ` Linus Torvalds
2017-08-16 20:19 ` Linus Torvalds
2017-08-16 20:30 ` Linus Torvalds
2017-08-16 21:03 ` Linus Torvalds
2017-08-16 21:37 ` Christian Brauner
2017-08-16 21:45 ` Linus Torvalds
2017-08-16 21:55 ` Linus Torvalds
2017-08-16 22:05 ` Christian Brauner
2017-08-16 22:28 ` Christian Brauner
2017-08-23 15:31 ` Eric W. Biederman
2017-08-23 21:15 ` Christian Brauner
2017-08-16 22:46 ` Eric W. Biederman
2017-08-16 22:58 ` Linus Torvalds
2017-08-16 23:51 ` Eric W. Biederman
2017-08-17 0:08 ` Linus Torvalds
2017-08-17 1:24 ` Eric W. Biederman
2017-08-24 0:24 ` Stefan Lippers-Hollmann
2017-08-24 0:42 ` Linus Torvalds
2017-08-24 1:16 ` Linus Torvalds
2017-08-24 1:25 ` Eric W. Biederman
2017-08-24 1:32 ` Linus Torvalds
2017-08-24 1:49 ` Linus Torvalds
2017-08-24 2:01 ` Linus Torvalds [this message]
2017-08-24 3:11 ` Eric W. Biederman
2017-08-24 3:24 ` Linus Torvalds
2017-08-24 15:51 ` Eric W. Biederman
2017-08-24 4:24 ` Stefan Lippers-Hollmann
2017-08-24 15:54 ` Eric W. Biederman
2017-08-24 17:52 ` Linus Torvalds
2017-08-24 18:06 ` Linus Torvalds
2017-08-24 18:13 ` Linus Torvalds
2017-08-24 18:31 ` Linus Torvalds
2017-08-24 18:36 ` Linus Torvalds
2017-08-24 20:24 ` Stefan Lippers-Hollmann
2017-08-24 20:27 ` Linus Torvalds
2017-08-24 18:40 ` Eric W. Biederman
2017-08-24 18:51 ` Linus Torvalds
2017-08-24 19:23 ` Eric W. Biederman
2017-08-24 20:13 ` [PATCH v3] pty: Repair TIOCGPTPEER Eric W. Biederman
2017-08-24 21:01 ` Stefan Lippers-Hollmann
[not found] ` <CAPP7u0WHqDfxTW6hmc=DsmHuoALZcrWdU-Odu=FfoTX26SGHQg@mail.gmail.com>
2017-08-24 19:22 ` [PATCH 0/1] devpts: use dynamic_dname() to generate proc name Linus Torvalds
2017-08-24 19:25 ` Linus Torvalds
2017-08-24 20:43 ` Eric W. Biederman
2017-08-24 21:07 ` Linus Torvalds
2017-08-24 23:01 ` Eric W. Biederman
2017-08-24 23:27 ` Linus Torvalds
2017-08-24 23:37 ` Christian Brauner
2017-08-26 1:00 ` Linus Torvalds
2017-08-24 19:48 ` Eric W. Biederman
2017-08-17 1:37 ` Eric W. Biederman
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