From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Eric Paris <eparis@redhat.com>, Al Viro <viro@ftp.linux.org.uk>,
James Morris <jmorris@namei.org>,
linux-kernel@vger.kernel.org, davem@redhat.com, jack@suse.cz,
dwmw2@infradead.org, tony.luck@intel.com, jdike@karaya.com,
James.Bottomley@HansenPartnership.com
Subject: Re: How to lock current->signal->tty
Date: Tue, 08 Aug 2006 18:43:14 +0100 [thread overview]
Message-ID: <1155058994.5729.99.camel@localhost.localdomain> (raw)
In-Reply-To: <1155057114.1123.97.camel@moss-spartans.epoch.ncsc.mil>
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.
next prev parent reply other threads:[~2006-08-08 17:23 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-08 15:17 How to lock current->signal->tty Alan Cox
2006-08-08 15:10 ` Arjan van de Ven
2006-08-08 15:44 ` Alan Cox
2006-08-08 16:41 ` Luck, Tony
2006-08-08 17:50 ` Alan Cox
2006-08-09 8:09 ` Jes Sorensen
2006-08-09 10:44 ` Alan Cox
2006-08-09 11:26 ` Jes Sorensen
2006-08-09 16:24 ` Luck, Tony
2006-08-09 18:10 ` Jes Sorensen
2006-08-08 22:06 ` Jan Kara
2006-08-08 17:11 ` Stephen Smalley
2006-08-08 17:43 ` Alan Cox [this message]
2006-08-08 17:44 ` Stephen Smalley
2006-08-08 18:10 ` Alan Cox
2006-08-08 20:02 ` Stephen Smalley
2006-08-13 21:34 ` Jan Kara
-- strict thread matches above, loose matches on Subject: below --
2006-08-09 4:01 Albert Cahalan
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