From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 53C3AEB64DD for ; Tue, 1 Aug 2023 09:51:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231891AbjHAJvM (ORCPT ); Tue, 1 Aug 2023 05:51:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230452AbjHAJu7 (ORCPT ); Tue, 1 Aug 2023 05:50:59 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8C802134 for ; Tue, 1 Aug 2023 02:50:26 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 63DCB614DF for ; Tue, 1 Aug 2023 09:50:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 767B8C433C8; Tue, 1 Aug 2023 09:50:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690883424; bh=Bk6svmQ1PaTilUfk4pihTRuY25FUL3DOBSvsycwCvjk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Fqk1ITGGhVkfMITEb0urcrCjwu6KHQBHYHpMTHXiDYiaM++mosb5+tqNOVn/61otz +PXA6AfIIgs4nWFSiJwFixbLQUEMKUoIL7tY1QkJoOqrX+0q/fDFL4Fv9Wr/DTwfVP qMlmDkTLYYAYj2BnlWlcrs5u8RbNJlSbQfRZx48U= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ilya Dryomov , Dongsheng Yang Subject: [PATCH 6.4 232/239] rbd: harden get_lock_owner_info() a bit Date: Tue, 1 Aug 2023 11:21:36 +0200 Message-ID: <20230801091934.368755472@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230801091925.659598007@linuxfoundation.org> References: <20230801091925.659598007@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ilya Dryomov commit 8ff2c64c9765446c3cef804fb99da04916603e27 upstream. - we want the exclusive lock type, so test for it directly - use sscanf() to actually parse the lock cookie and avoid admitting invalid handles - bail if locker has a blank address Signed-off-by: Ilya Dryomov Reviewed-by: Dongsheng Yang Signed-off-by: Greg Kroah-Hartman --- drivers/block/rbd.c | 21 +++++++++++++++------ net/ceph/messenger.c | 1 + 2 files changed, 16 insertions(+), 6 deletions(-) --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -3862,10 +3862,9 @@ static struct ceph_locker *get_lock_owne u32 num_lockers; u8 lock_type; char *lock_tag; + u64 handle; int ret; - dout("%s rbd_dev %p\n", __func__, rbd_dev); - ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, RBD_LOCK_NAME, &lock_type, &lock_tag, &lockers, &num_lockers); @@ -3886,18 +3885,28 @@ static struct ceph_locker *get_lock_owne goto err_busy; } - if (lock_type == CEPH_CLS_LOCK_SHARED) { - rbd_warn(rbd_dev, "shared lock type detected"); + if (lock_type != CEPH_CLS_LOCK_EXCLUSIVE) { + rbd_warn(rbd_dev, "incompatible lock type detected"); goto err_busy; } WARN_ON(num_lockers != 1); - if (strncmp(lockers[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, - strlen(RBD_LOCK_COOKIE_PREFIX))) { + ret = sscanf(lockers[0].id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", + &handle); + if (ret != 1) { rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", lockers[0].id.cookie); goto err_busy; } + if (ceph_addr_is_blank(&lockers[0].info.addr)) { + rbd_warn(rbd_dev, "locker has a blank address"); + goto err_busy; + } + + dout("%s rbd_dev %p got locker %s%llu@%pISpc/%u handle %llu\n", + __func__, rbd_dev, ENTITY_NAME(lockers[0].id.name), + &lockers[0].info.addr.in_addr, + le32_to_cpu(lockers[0].info.addr.nonce), handle); out: kfree(lock_tag); --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -1123,6 +1123,7 @@ bool ceph_addr_is_blank(const struct cep return true; } } +EXPORT_SYMBOL(ceph_addr_is_blank); int ceph_addr_port(const struct ceph_entity_addr *addr) {