linux-kernel - [PATCH 09/10] keys: Reuse keyring_index_key::desc_len in lookup_user

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Message-ID: <156095039896.9363.4535558628030573762.stgit@warthog.procyon.org.uk>
Date:   Wed, 19 Jun 2019 14:19:59 +0100
From:   David Howells <dhowells@...hat.com>
To:     keyrings@...r.kernel.org, ebiggers@...nel.org
Cc:     Eric Biggers <ebiggers@...gle.com>,
        James Morris <jamorris@...ux.microsoft.com>,
        dhowells@...hat.com, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 09/10] keys: Reuse keyring_index_key::desc_len in
 lookup_user_key() [ver #3]

From: Eric Biggers <ebiggers@...gle.com>

When lookup_user_key() checks whether the key is possessed, it should
use the key's existing index_key including the 'desc_len' field, rather
than recomputing the 'desc_len'.  This doesn't change the behavior; this
way is just simpler and faster.

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: James Morris <jamorris@...ux.microsoft.com>
---

 security/keys/process_keys.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index ba5d3172cafe..39aaa21462bf 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -688,9 +688,7 @@ key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags,
 		key_ref = make_key_ref(key, 0);
 
 		/* check to see if we possess the key */
-		ctx.index_key.type		= key->type;
-		ctx.index_key.description	= key->description;
-		ctx.index_key.desc_len		= strlen(key->description);
+		ctx.index_key			= key->index_key;
 		ctx.match_data.raw_data		= key;
 		kdebug("check possessed");
 		skey_ref = search_process_keyrings(&ctx);