linux-kernel - Re: Error returns not handled correctly by sysfs.c:subsys_attr

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]

Message-ID: <20071127053321.GA975@kroah.com>
Date:	Mon, 26 Nov 2007 21:33:21 -0800
From:	Greg KH <greg@...ah.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <teheo@...e.de>
Cc:	andrew.patterson@...com, linux-kernel@...r.kernel.org,
	linux-hotplug@...r.kernel.org
Subject: Re: Error returns not handled correctly by
	sysfs.c:subsys_attr_store()

On Mon, Nov 26, 2007 at 08:31:16PM -0800, Andrew Morton wrote:
> On Wed, 21 Nov 2007 15:16:59 -0700 Andrew Patterson <andrew.patterson@...com> wrote:
> 
> > The buf in fs/sysfs.c:subsys_attr_store() does not seem to be updated
> > correctly when returning a negative value (indicating that an error
> > condition has occurred) is returned.  If a negative value is returned,
> > the next subsequent call to subsys_attr_store will have the contents of
> > buf appended to the previous call.
> 
> subsys_attr_store() gets deleted by
> http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/gregkh-01-driver/kset-kill-subsys-attr.patch
> 
> So maybe we will soon accidentally fix whatever-this-is?  Or maybe we will
> faithfully maintain it.

Yes, subsys attributes go away, but this is showing a bug in the sysfs
core with attributes, not in the "middle" layers of attributes.

I bounced the original bug report to Tejun, who has been changing the
logic around this area to see if he sees anything that might be
different now.

Tejun?

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/