linux-kernel - Re: [PATCH] kobject: kzfree object in

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]

Date:	Mon, 13 Apr 2009 09:31:01 -0700
From:	Greg KH <greg@...ah.com>
To:	tom.leiming@...il.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kobject: kzfree object in _release function

On Sun, Apr 12, 2009 at 12:16:26AM +0800, tom.leiming@...il.com wrote:
> From: Ming Lei <tom.leiming@...il.com>
> 
> It helps to troubleshoot the __buggy__ case, in which
> unreferenced objects are still accessed, using kzfree
> to free objects safely in _release function.
> 
> Signed-off-by: Ming Lei <tom.leiming@...il.com>
> ---
>  lib/kobject.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/kobject.c b/lib/kobject.c
> index a6dec32..cb5a562 100644
> --- a/lib/kobject.c
> +++ b/lib/kobject.c
> @@ -597,7 +597,7 @@ void kobject_put(struct kobject *kobj)
>  static void dynamic_kobj_release(struct kobject *kobj)
>  {
>  	pr_debug("kobject: (%p): %s\n", kobj, __func__);
> -	kfree(kobj);
> +	kzfree(kobj);
>  }
>  
>  static struct kobj_type dynamic_kobj_ktype = {
> @@ -762,7 +762,7 @@ static void kset_release(struct kobject *kobj)
>  	struct kset *kset = container_of(kobj, struct kset, kobj);
>  	pr_debug("kobject: '%s' (%p): %s\n",
>  		 kobject_name(kobj), kobj, __func__);
> -	kfree(kset);
> +	kzfree(kset);


What about slab-poisoning?  Shouldn't we just rely on that instead?

thanks,

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/