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Date: Tue, 08 Aug 2006 18:43:14 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: Stephen Smalley <sds@...ho.nsa.gov>
Cc: Eric Paris <eparis@...hat.com>, Al Viro <viro@....linux.org.uk>,
James Morris <jmorris@...ei.org>, linux-kernel@...r.kernel.org,
davem@...hat.com, jack@...e.cz, dwmw2@...radead.org,
tony.luck@...el.com, jdike@...aya.com,
James.Bottomley@...senPartnership.com
Subject: Re: How to lock current->signal->tty
Ar Maw, 2006-08-08 am 13:11 -0400, ysgrifennodd Stephen Smalley:
> Does this look sane? Or do we need a common helper factored from
> disassociate_ctty()? Why is the locking different for TIOCNOTTY in the
> non-leader case?
The non-leader case for TIOCNOTTY in the base kernel is different
because it is wrong and I've fixed that one.
If you can factor disassociate_ctty out to do what you need I'd prefer
that path so the tty locking actually ends up in the tty layer.
> + mutex_lock(&tty_mutex);
> + tty = current->signal->tty;
> if (tty) {
> file_list_lock();
Looks sane and the lock ordering matches vhangup() which may actually
also do what you want - I'm not 100% sure I follow what SELinux tries to
do here.
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