linux-kernel - Re: Race condition between driver_probe_device and device

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] [day] [month] [year] [list]

Date:	Sat, 8 Dec 2012 00:27:34 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Wedson Almeida Filho <wedsonaf@...il.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Linux PM List <linux-pm@...r.kernel.org>
Subject: Re: Race condition between driver_probe_device and device_shutdown

On Fri, Dec 7, 2012 at 11:25 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Fri, 7 Dec 2012, Ming Lei wrote:
>> device_pm_lock() can prevent device_move() from being running.
>
> That wouldn't prevent problems during unbinding.  Wedson is right; the

Right.

> places that lock dev->parent must save a local copy of dev->parent.

One simple fix is to remove acquiring/releasing dev->parent lock
and get/put the parent reference, because holding the device lock only
may avoid the race between probe/remove and shutdown.

But __driver_attach and __device_release_driver need
save the local copy of dev->parent.

Thanks,
--
Ming Lei
--
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/