linux-kernel - Re: [patch 00/13] devtmpfs patches

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Message-ID: <ac3eb2510905130609g10043215xfc391658f7d151b3@mail.gmail.com>
Date:	Wed, 13 May 2009 15:09:27 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Stephen Smalley <sds@...ho.nsa.gov>
Cc:	"David P. Quigley" <dpquigl@...ho.nsa.gov>,
	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org,
	Greg KH <gregkh@...e.de>, Jan Blunck <jblunck@...e.de>,
	James Morris <jmorris@...ei.org>,
	Eric Paris <eparis@...isplace.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [patch 00/13] devtmpfs patches

On Wed, May 13, 2009 at 14:57, Stephen Smalley <sds@...ho.nsa.gov> wrote:
>> Ok, good, will do that. Anything like this to keep in mind when
>> creating/removing simple subdirectories?
>
> Yes, any time you call any vfs helper (and thus are subject to the
> permission checking calls, both DAC and LSM/SELinux), you need to decide
> whether you truly want those permission checks to get applied against
> the current process' credentials or whether you should be using
> alternate credentials for the call.

Yeah, I see. I'll wrap the entire operation in the swapped
credentials, which should be the best option anyway.

Thanks a lot,
Kay
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