linux-kernel - Re: [PATCH] Security/sysfs: Enable security xattrs to be set on sysfs files, directories, and symlinks.

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Date:	Tue, 14 Jul 2009 16:16:06 -0400
From:	"David P. Quigley" <dpquigl@...ho.nsa.gov>
To:	Greg KH <gregkh@...e.de>
Cc:	jmorris@...ei.org, sds@...ho.nsa.gov, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH] Security/sysfs: Enable security xattrs to be set on
 sysfs files, directories, and symlinks.

On Tue, 2009-07-14 at 10:50 -0700, Greg KH wrote:
> On Tue, Jul 14, 2009 at 12:37:39PM -0400, David P. Quigley wrote:
> > So, I've been looking through the sysfs code and I can't find a
> > reference to netlink in there. I am assuming that it is other parts of
> > the kernel which make use of netlink which are calling the sysfs_*
> > functions. Any suggestions for where to look on how this is being used
> > and what the important users are?
> 
> The netlink messages are coming from the kobject uevent code, look in
> lib/kobject_uevent.c for the code that creates and sends them out.  This
> happens for every sysfs directory that is created that corresponds with
> a kobject.
> 
> thanks,
> 
> greg k-h

It is unclear to me what if anything we need to do to the kobject_uevent
code for these changes. Do you have a particular use case in mind? Is
there some sort of notification that should be sent up to user space
when the label is changed on a file?

Dave

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