From patchwork Tue Jun 8 18:27:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 457768 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22E10C4743D for ; Tue, 8 Jun 2021 18:31:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 056BC61376 for ; Tue, 8 Jun 2021 18:31:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233682AbhFHSdh (ORCPT ); Tue, 8 Jun 2021 14:33:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:57600 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234309AbhFHSch (ORCPT ); Tue, 8 Jun 2021 14:32:37 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4DE7D613B9; Tue, 8 Jun 2021 18:30:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1623177027; bh=EHZJLvG/aunoeWaZiHpji8erF1KoKgD/dmIWqn/lG2c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bD6Wim8vEYWpYuqPxPiVenG0QrQJ9swPHMmMAjxhRspKGdXsbwcwyHStQO+cCb5eM I1DAMLyBWE++fQjd5ucCM+lzUG0ODDiMGrHpSK90TaJPUe4Q0qhD04yeJ78mg1ghgx jUF1RO6RDSr9h92x0pYPfnYi9KADKTsU3xywNphg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lin Ma , Marcel Holtmann Subject: [PATCH 4.9 14/29] Bluetooth: use correct lock to prevent UAF of hdev object Date: Tue, 8 Jun 2021 20:27:08 +0200 Message-Id: <20210608175928.284131791@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210608175927.821075974@linuxfoundation.org> References: <20210608175927.821075974@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Lin Ma commit e305509e678b3a4af2b3cfd410f409f7cdaabb52 upstream. The hci_sock_dev_event() function will cleanup the hdev object for sockets even if this object may still be in used within the hci_sock_bound_ioctl() function, result in UAF vulnerability. This patch replace the BH context lock to serialize these affairs and prevent the race condition. Signed-off-by: Lin Ma Signed-off-by: Marcel Holtmann Signed-off-by: Greg Kroah-Hartman --- net/bluetooth/hci_sock.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/net/bluetooth/hci_sock.c +++ b/net/bluetooth/hci_sock.c @@ -750,7 +750,7 @@ void hci_sock_dev_event(struct hci_dev * /* Detach sockets from device */ read_lock(&hci_sk_list.lock); sk_for_each(sk, &hci_sk_list.head) { - bh_lock_sock_nested(sk); + lock_sock(sk); if (hci_pi(sk)->hdev == hdev) { hci_pi(sk)->hdev = NULL; sk->sk_err = EPIPE; @@ -759,7 +759,7 @@ void hci_sock_dev_event(struct hci_dev * hci_dev_put(hdev); } - bh_unlock_sock(sk); + release_sock(sk); } read_unlock(&hci_sk_list.lock); }