From nobody Wed Apr 1 22:19:12 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 38CD2408245 for ; Wed, 1 Apr 2026 10:57:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775041039; cv=none; b=PdNYWyUdTIilARKBRIB+4DmpxVvVdlHRp+hAcILOtndcbKeDw2rMOwrGh3zUBmw8pSyNYsJc1riCFNbGw7K2w9D2lDo12nlE1ASlkn7gfpQyclQp5ihAfA381+qcoZo6SVleuM9Hh4ltE+BXnwo8dUf3E3WSp2RpykNZO3mL19A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775041039; c=relaxed/simple; bh=I3X9Xgh8JthJcC1AVR46HTecX3GW+jzHyhem1V0naug=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LYqjWPgFl2004HmtHrEfYmd36WHXKUlnQ6tnKgAUqMYWztYH1418wxTK9/2AwBUvTJ56Uf02FW23cy23UTFkaG7KVevxIj+8v22bKvZP6RncV1KuA6h0DnR/QuvHQ4UR+be7mcwPcdx3u/ZZRxCaRPoma+91JIife9it80AJ5s0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=bCILPvBf; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bCILPvBf" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1775041037; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=AN3SQlsqlhxFhvczjAvAzreHONU16FaElSEWYMuHbwQ=; b=bCILPvBfDLswBzCq+9wmpeBqjHrnxdh1kKDjPKADzY336/4a6DkmNCNMdWKlfobBpaKgcj hq0Yd1gjvxBnPoIQNkvpdRS7rzuF+dFBo+47lDpQyPRHTDkvmF77h4YcllbwNgMNDWbfCF 3cc4pNBdKZEEHozlGgV1Sy5uVHARY1c= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-140-xDRS5RMWMi-AeeryTccoxg-1; Wed, 01 Apr 2026 06:57:15 -0400 X-MC-Unique: xDRS5RMWMi-AeeryTccoxg-1 X-Mimecast-MFC-AGG-ID: xDRS5RMWMi-AeeryTccoxg_1775041033 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 645661800464; Wed, 1 Apr 2026 10:57:13 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.35.245]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 9FB7930001A2; Wed, 1 Apr 2026 10:57:09 +0000 (UTC) From: David Howells To: netdev@vger.kernel.org Cc: David Howells , Marc Dionne , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org, Anderson Nascimento , Jeffrey Altman , Simon Horman , stable@kernel.org Subject: [PATCH net v4 08/15] rxrpc: Fix keyring reference count leak in rxrpc_setsockopt() Date: Wed, 1 Apr 2026 11:56:01 +0100 Message-ID: <20260401105614.1696001-9-dhowells@redhat.com> In-Reply-To: <20260401105614.1696001-1-dhowells@redhat.com> References: <20260401105614.1696001-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Content-Type: text/plain; charset="utf-8" From: Anderson Nascimento In rxrpc_setsockopt(), the code checks 'rx->key' when handling the RXRPC_SECURITY_KEYRING option. However, this appears to be a logic error. The code should be checking 'rx->securities' to determine if a keyring has already been defined for the socket. Currently, if a user calls setsockopt(RXRPC_SECURITY_KEYRING) multiple times on the same socket, the check 'if (rx->key)' fails to block subsequent calls because 'rx->key' has not been defined by the function. This results in a reference count leak on the keyring. This patch changes the check to 'rx->securities' to correctly identify if the socket security keyring has already been configured, returning -EINVAL on subsequent attempts. Before the patch: It shows the keyring reference counter elevated. $ cat /proc/keys | grep AFSkeys1 27aca8ae I--Q--- 24469721 perm 3f010000 1000 1000 keyring AFSkeys1: emp= ty $ After the patch: The keyring reference counter remains stable and subsequent calls return an error: $ ./poc setsockopt: Invalid argument $ Fixes: 17926a79320a ("[AF_RXRPC]: Provide secure RxRPC sockets for use by u= serspace and kernel both") Signed-off-by: Anderson Nascimento Signed-off-by: David Howells Reviewed-by: Jeffrey Altman cc: Marc Dionne cc: Eric Dumazet cc: "David S. Miller" cc: Jakub Kicinski cc: Paolo Abeni cc: Simon Horman cc: linux-afs@lists.infradead.org cc: netdev@vger.kernel.org cc: stable@kernel.org --- net/rxrpc/af_rxrpc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c index 0f90272ac254..0b7ed99a3025 100644 --- a/net/rxrpc/af_rxrpc.c +++ b/net/rxrpc/af_rxrpc.c @@ -665,7 +665,7 @@ static int rxrpc_setsockopt(struct socket *sock, int le= vel, int optname, =20 case RXRPC_SECURITY_KEYRING: ret =3D -EINVAL; - if (rx->key) + if (rx->securities) goto error; ret =3D -EISCONN; if (rx->sk.sk_state !=3D RXRPC_UNBOUND)