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

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Date:	Wed, 10 Sep 2014 22:22:06 +0100
From:	David Howells <dhowells@...hat.com>
To:	jmorris@...ei.org
Cc:	keyrings@...ux-nfs.org, linux-kernel@...r.kernel.org,
	dhowells@...hat.com, linux-security-module@...r.kernel.org,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: [PATCH 2/6] KEYS: Reinstate EPERM for a key type name beginning
 with a '.'

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.

The test was removed by:

	commit a4e3b8d79a5c6d40f4a9703abf7fe3abcc6c3b8d
	Author: Mimi Zohar <zohar@...ux.vnet.ibm.com>
	Date:   Thu May 22 14:02:23 2014 -0400
	Subject: KEYS: special dot prefixed keyring name bug fix

I think we want to keep the restriction on type name so that userspace can't
add keys of a special internal type.

Note that removal of the test causes several of the tests in the keyutils
testsuite to fail.

Signed-off-by: David Howells <dhowells@...hat.com>
Acked-by: Vivek Goyal <vgoyal@...hat.com>
cc: Mimi Zohar <zohar@...ux.vnet.ibm.com>
---

 security/keys/keyctl.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index e26f860e5f2e..eff88a5f5d40 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -37,6 +37,8 @@ static int key_get_type_from_user(char *type,
 		return ret;
 	if (ret == 0 || ret >= len)
 		return -EINVAL;
+	if (type[0] == '.')
+		return -EPERM;
 	type[len - 1] = '\0';
 	return 0;
 }

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