linux-kernel - Re: And now for something _totally

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <200706200031.07082.m.kozlowski@tuxland.pl>
Date:	Wed, 20 Jun 2007 00:31:05 +0200
From:	Mariusz Kozlowski <m.kozlowski@...land.pl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: And now for something _totally_ different: Linux v2.6.22-rc5

> > 	MAINTAINERS says riscom8 is orphaned so not sure
> > if anybody cares. Spotted this when playing with modprobe
> > walking /lib/modules/`uname -r`/kernel in a loop ;)
> 
> Oh wow.
> 
> I wonder why it does that. The code literally does:
> 
>         save_flags(flags);
>         cli();
>         tty_unregister_driver(riscom_driver);
>         put_tty_driver(riscom_driver);
>         restore_flags(flags);
> 
> and I don't see the point.
> 
> (And that's what then causes the warning: tty_unregister_driver will 
> eventually get a mutex, but the caller had disabled hardware interrupts..
> 
> I see absolutely *zero* reason for that whole save_flags/cli/restore_flags 
> dance at all, so I think the right thing to do is to just remove it.
> 
> I'm Cc'ing Alan, in case he cares. 
> 
> Mariusz, if you actually *use* the dang thing, and really care, you can 
> send me a tested patch. I can pretty much guarantee that removing those 
> irq games won't make things any worse, but no way am I going to just 
> remove it on my own without any users or any testing.

Unfortunately I can test it only the way I did it so far. That means no real
hardware :-/ This also implies I do care but not that much ;-) If you want any
patches to be tested that way -> feel free to mail me.

	Mariusz
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/