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
| ||
|
Date: Wed, 23 May 2012 19:14:29 -0700 From: Greg KH <gregkh@...uxfoundation.org> To: Ming Lei <ming.lei@...onical.com> Cc: Alan Stern <stern@...land.harvard.edu>, "Eric W. Biederman" <ebiederm@...ssion.com>, Wedson Almeida Filho <wedsonaf@...il.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 Thu, May 24, 2012 at 09:39:46AM +0800, Ming Lei wrote: > On Wed, May 23, 2012 at 11:06 PM, Alan Stern <stern@...land.harvard.edu> wrote: > > On Wed, 23 May 2012, Ming Lei wrote: > >> The .shutdown callback pointer is got from device->driver, which is > >> changed in probe and release path. Also runtime PM thing has been > >> involved into shutting down recently, so looks not only hardware parts > >> are involved now. > > > > This is a tricky question. Overall I think you're probably right. > > > > It's certainly true that holding the device lock across the shutdown > > callback is the easiest and most reliable way to prevent these races. > > But holding device lock across .shutdown is very inefficient because > most of devices' driver have not shutdown callback, so I think it is better > to fix the race by prevent driver core from probing or releasing once > shutdown is started. > > How about the below patch? How about waiting for the original poster to respond as to exactly how they are hitting this race before doing anything? greg k-h -- 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/
Powered by blists - more mailing lists