From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Richard Weinberger <richard@nod.at>
Cc: user-mode-linux-devel@lists.sourceforge.net,
gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
viro@zeniv.linux.org.uk, jslaby@suse.cz, alan@linux.intel.com
Subject: Re: [uml-devel] um: TTY fixes (?)
Date: Mon, 4 Jun 2012 22:17:31 +0100 [thread overview]
Message-ID: <20120604221731.5e378fc2@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <1338841657-30358-1-git-send-email-richard@nod.at>
> On all other ttys login works but bash dies because of of -EIO.
> After vhangup() the tty returns -EIO upon read()/write().
You can't re-open the tty because a process is holding on to it, not
closing it and not killable. Fedora shouldn't be holding these devices
open this way. The behaviour we have of refusing to reopen them why this
is the case is both a) what the spec seems to say b) good security.
We can half ignore it on console for the simple reason that you don't
"dial in" to the console. I suspect it may be abusable but I've not found
a way to do so.
> I have no idea what's the root cause of this, there seems to be a lot of black magic
> involved.
> Alan, do you think the issues are caused by Fedora's broken user space?
See what fuser says about open file handles and if that is what is going
on.
Alan
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next prev parent reply other threads:[~2012-06-04 21:14 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-04 20:27 um: TTY fixes (?) Richard Weinberger
2012-06-04 20:27 ` [uml-devel] [PATCH 1/6] TTY: um/line, add tty_port Richard Weinberger
2012-06-04 20:27 ` [uml-devel] [PATCH 2/6] TTY: um/line, use tty from tty_port Richard Weinberger
2012-06-04 20:27 ` [uml-devel] [PATCH 3/6] um: remove line_ioctl() Richard Weinberger
2012-06-04 20:27 ` [uml-devel] [PATCH 4/6] um: Remove dead code Richard Weinberger
2012-06-04 20:27 ` [uml-devel] [PATCH 5/6] um: fully use tty_port Richard Weinberger
2012-06-04 20:47 ` Jiri Slaby
2012-06-04 20:27 ` [uml-devel] [PATCH 6/6] um: remove count_lock Richard Weinberger
2012-06-04 21:17 ` Alan Cox [this message]
2012-06-04 23:14 ` um: TTY fixes (?) Richard Weinberger
2012-06-05 10:41 ` Karel Zak
2012-06-05 11:15 ` [uml-devel] " Alan Cox
2012-06-05 12:20 ` Richard Weinberger
2012-06-05 15:17 ` [uml-devel] " Karel Zak
2012-07-12 14:49 ` Karel Zak
2012-07-12 15:01 ` Richard Weinberger
2012-06-06 23:17 ` Richard Weinberger
2012-06-07 9:19 ` Alan Cox
2012-06-07 9:06 ` Richard Weinberger
2012-06-06 14:20 ` [uml-devel] " Boaz Harrosh
2012-06-07 7:35 ` Boaz Harrosh
2012-06-07 7:43 ` Boaz Harrosh
2012-06-07 8:45 ` Richard Weinberger
2012-06-07 9:22 ` Alan Cox
2012-06-07 10:14 ` Boaz Harrosh
2012-06-07 10:19 ` Richard Weinberger
2012-06-07 10:35 ` Boaz Harrosh
2012-06-07 10:52 ` Alan Cox
2012-06-07 13:41 ` Boaz Harrosh
2012-06-07 15:18 ` Richard Weinberger
2012-06-07 16:37 ` Alan Cox
2012-06-07 16:32 ` Richard Weinberger
2012-06-07 16:50 ` Alan Cox
2012-06-07 16:41 ` Richard Weinberger
2012-06-07 17:26 ` Alan Cox
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