linux-kernel - Re: [PATCH 0/5] lockdep: (Was: check && lockdep_no

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: <Pine.LNX.4.44L0.1401201640090.28417-100000@netrider.rowland.org>
Date:	Mon, 20 Jan 2014 16:42:45 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Oleg Nesterov <oleg@...hat.com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: [PATCH 0/5] lockdep: (Was: check && lockdep_no_validate)

On Mon, 20 Jan 2014, Oleg Nesterov wrote:

> > > At first glance, can't __ATTR_IGNORE_LOCKDEP() use no_validate too ?
> > > (ignoring the fact checkpatch.pl won't be happy). This can simplify
> > > the code, it seems.
> >
> > Well, the macro itself doesn't specify the lockdep class.  That happens
> > implicitly in sysfs_get_active(), in the call to rwsem_acquire_read().
> > However, it ought to be possible to change the code so that when
> > ignore_lockdep(sd) returns nonzero, we end up using no_validate.
> 
> sysfs_dirent_init_lockdep() can check ->ignore_lockdep and do
> lockdep_set_novalidate_class(). This way sysfs_ignore_lockdep() can
> go away.
> 
> I guess we could even change __ATTR_IGNORE_LOCKDEP() to initialize
> ->key = __lockdep_no_validate__ and kill ->ignore_lockdep.

It's clear that you have a more thorough understanding of how sysfs and
lockdep work than I do.  :-)

This suggestion sounds quite reasonable.

Alan Stern

--
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/