linux-kernel - Re: [PATCH] TTY: Fix loss of echoed characters (2nd follow-on PATCH attached)

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]

Date:	Tue, 9 Sep 2008 11:55:36 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Joe Peterson <joe@...rush.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] TTY: Fix loss of echoed characters (2nd follow-on PATCH
 attached)

On Mon, 8 Sep 2008 17:32:50 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Mon, 08 Sep 2008 10:11:46 -0600
> Joe Peterson <joe@...rush.com> wrote:
> 
> > +	spin_lock_irqsave(&tty->echo_lock, flags);
> >  	lock_kernel();
> 
> Taking a spinlock outside lock_kernel() isn't good, and is quite unusual.
> 
> - It might be ab/ba deadlockable (I didn't check) (I trust you always
>   test with lockdep enabled?)

lock_kernel can sleep. Its not allowed...

Alan
--
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/