linux-kernel - Re: Subject: [PATCH] kobject: fix the race between kobject_del and get_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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 4 Nov 2014 14:15:35 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Weng Meiling <wengmeiling.weng@...wei.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Frans Klaver <fransklaver@...il.com>,
	Jens Axboe <axboe@...nel.dk>, akpm@...ux-foundation.org,
	adilger.kernel@...ger.ca, Jan Kara <jack@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Xiang Rui <rui.xiang@...wei.com>,
	Li Zefan <lizefan@...wei.com>,
	Huang Qiang <h.huangqiang@...wei.com>,
	Zhao Hongjiang <zhaohongjiang@...wei.com>,
	Wangyijing <wangyijing@...wei.com>
Subject: Re: Subject: [PATCH] kobject: fix the race between kobject_del and
 get_device_parent

Hello,

Sorry about the delay.

On Wed, Oct 22, 2014 at 04:07:44PM +0800, Weng Meiling wrote:
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 28b808c..645eacf 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -724,12 +724,12 @@ class_dir_create_and_add(struct class *class, struct kobject *parent_kobj)
>  	return &dir->kobj;
>  }
> 
> +static DEFINE_MUTEX(gdp_mutex);
> 
>  static struct kobject *get_device_parent(struct device *dev,
>  					 struct device *parent)
>  {
>  	if (dev->class) {
> -		static DEFINE_MUTEX(gdp_mutex);
>  		struct kobject *kobj = NULL;
>  		struct kobject *parent_kobj;
>  		struct kobject *k;
> @@ -793,7 +793,9 @@ static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
>  	    glue_dir->kset != &dev->class->p->glue_dirs)
>  		return;
> 
> +	mutex_lock(&gdp_mutex);
>  	kobject_put(glue_dir);
> +	mutex_unlock(&gdp_mutex);

So, yeah, this looks like a correct approach; however, do we even need
to clear the glue directories?  What's the downside of just keeping
them around once created?

Thanks.

-- 
tejun
--
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/