linux-kernel - [PATCH 4.9 032/138] libceph: dont WARN() if user tries to add invalid key

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Message-Id: <20171128100547.067704039@linuxfoundation.org>
Date:   Tue, 28 Nov 2017 11:22:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>,
        Ilya Dryomov <idryomov@...il.com>
Subject: [PATCH 4.9 032/138] libceph: dont WARN() if user tries to add invalid key

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit b11270853fa3654f08d4a6a03b23ddb220512d8d upstream.

The WARN_ON(!key->len) in set_secret() in net/ceph/crypto.c is hit if a
user tries to add a key of type "ceph" with an invalid payload as
follows (assuming CONFIG_CEPH_LIB=y):

    echo -e -n '\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' \
	| keyctl padd ceph desc @s

This can be hit by fuzzers.  As this is merely bad input and not a
kernel bug, replace the WARN_ON() with return -EINVAL.

Fixes: 7af3ea189a9a ("libceph: stop allocating a new cipher on every crypto request")
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Reviewed-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/ceph/crypto.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ceph/crypto.c
+++ b/net/ceph/crypto.c
@@ -34,7 +34,9 @@ static int set_secret(struct ceph_crypto
 		return -ENOTSUPP;
 	}
 
-	WARN_ON(!key->len);
+	if (!key->len)
+		return -EINVAL;
+
 	key->key = kmemdup(buf, key->len, GFP_NOIO);
 	if (!key->key) {
 		ret = -ENOMEM;