linux-kernel - Re: [Update][PATCH 1/5] ACPI / scan: Prevent device add uevents from racing with user space

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Date:	Wed, 23 Jan 2013 16:33:19 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Kristen C. Accardi" <kristen.c.accardi@...el.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [Update][PATCH 1/5] ACPI / scan: Prevent device add uevents from
 racing with user space

On Wed, Jan 23, 2013 at 06:58:31PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> ACPI core adds sysfs device files after the given devices have been
> registered with device_register(), which is not appropriate, because
> it may lead to race conditions with user space tools using those
> files.
> 
> Fix the problem by delaying the KOBJ_ADD uevent for ACPI devices
> until after all of the devices' sysfs files have been created.
> 
> This also fixes a use-after-free in acpi_device_unregister().
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Nice fix.

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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