linux-kernel - Re: [PATCH 2/6] KEYS: Reinstate EPERM for a key type name beginning with a '.'

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Message-ID: <CACE9dm-4tURS7ZvJ45W81L5d3yaO8VDyvrcn1-SU_6UsHkmuQw@mail.gmail.com>
Date:	Thu, 11 Sep 2014 15:27:05 +0300
From:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	James Morris <jmorris@...ei.org>,
	keyrings <keyrings@...ux-nfs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH 2/6] KEYS: Reinstate EPERM for a key type name beginning
 with a '.'

On 11 September 2014 15:09, David Howells <dhowells@...hat.com> wrote:
> Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
>
>> On Wed, 2014-09-10 at 19:36 -0400, Mimi Zohar wrote:
>> > On Wed, 2014-09-10 at 22:22 +0100, David Howells wrote:
>> > > Reinstate the generation of EPERM for a key type name beginning with a
>> > > '.' in a userspace call.  Types whose name begins with a '.' are
>> > > internal only.
>>
>> After re-reading your comment and looking at the different types,
>> testing for dot prefixed types now makes sense.  Both dot prefixed types
>> and keyring names are reserved for the kernel.
>
> Are you withdrawing your objection, then?
>

For me, type test looks unrelated to "." prefixed key/keyring names...

The rest of that patch does following:

+ } else if ((description[0] == '.') &&
+                    (strncmp(type, "keyring", 7) == 0)) {
+             ret = -EPERM;
+             goto error2;


I wonder why this test is only disallowing keyrings...
Why not also keys?

keyctl add user ".ring1" Hello @u

keyctl show
  50463278 --alswrv      0     0       \_ user: .ring1


- Dmitry

> David
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-- 
Thanks,
Dmitry
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