linux-kernel - [PATCH 2/6] KEYS: Allow keyctl_revoke() on keys that have SETATTR but not WRITE perm

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Message-ID: <20090804145535.17676.87650.stgit@warthog.procyon.org.uk>
Date:	Tue, 04 Aug 2009 15:55:35 +0100
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...ux-foundation.org, jmorris@...ei.org
Cc:	serue@...ibm.com, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	David Howells <dhowells@...hat.com>
Subject: [PATCH 2/6] KEYS: Allow keyctl_revoke() on keys that have SETATTR but
	not WRITE perm

Allow keyctl_revoke() to operate on keys that have SETATTR but not WRITE
permission, rather than only on keys that have WRITE permission.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 security/keys/keyctl.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)


diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index b85ace2..1160b64 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -343,7 +343,13 @@ long keyctl_revoke_key(key_serial_t id)
 	key_ref = lookup_user_key(id, 0, KEY_WRITE);
 	if (IS_ERR(key_ref)) {
 		ret = PTR_ERR(key_ref);
-		goto error;
+		if (ret != -EACCES)
+			goto error;
+		key_ref = lookup_user_key(id, 0, KEY_SETATTR);
+		if (IS_ERR(key_ref)) {
+			ret = PTR_ERR(key_ref);
+			goto error;
+		}
 	}
 
 	key_revoke(key_ref_to_ptr(key_ref));

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