linux-kernel - Re: [PATCH 28/49] tty: Add a new file /proc/tty/consoles

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Message-ID: <20101023154636.GA18786@suse.de>
Date:	Sat, 23 Oct 2010 08:46:36 -0700
From:	Greg KH <gregkh@...e.de>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	"Dr. Werner Fink" <werner@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 28/49] tty: Add a new file /proc/tty/consoles

On Sat, Oct 23, 2010 at 01:26:12PM +0100, Al Viro wrote:
> On Sat, Oct 23, 2010 at 02:00:38PM +0200, Jiri Slaby wrote:
> 
> > > Please, don't.  Even leaving aside the fact that it's mind-bogglingly
> > > broken (->private_data can be _ANYTHING_, including arbitrary number cast
> > > to pointer), you really shouldn't screw your way through the descriptor
> > > table in the first place.
> > > 
> > > Strongly NACKed.
> > 
> > Well, our complains are -ETOOLATE -- it's commit f4a3e0bceb57466c
> > upstream. So please fix this up.
> 
> FVO "fix" equal to "revert".  Belated review:
> 
> a) global variable depending on stdin of the last opener?  Affecting
> output of read(2)?  Really?
> 
> b) iterator is broken; list should be locked in ->start(), unlocked
> in ->stop() and *NOT* unlocked/relocked in ->next()
> 
> c) ->show() ought to do nothing in case of ->device == NULL, instead
> of skipping those in ->next()/->start()
> 
> d) regardless of the merits of the bright idea about asterisk at that
> line in output *and* regardless of (a), the implementation is not only
> atrociously ugly, it's actually very likely to be a roothole.  Verifying
> that Cthulhu knows what number happens to be address of a tty_struct by
> blindly dereferencing memory at that address...  Ouch.
> 
> Please revert that crap.

I'll revert it and send the pull request to Linus.

Sorry about this.

greg k-h
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