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 X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 C740AC433E1 for ; Fri, 21 Aug 2020 17:23:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A05492075E for ; Fri, 21 Aug 2020 17:23:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598030628; bh=8Ehh7V2FSQcjIFlLPGKbe+IttvqyB6gO7LC3jyQuRE0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SuuHMeinpxopBdRTmcJDqQspfch4pnyfpJSd0bH/UqpLDN9UXN2tMftv3vaqOc9vW YP2XasQvsUuqhlITVf0D0lPIEEFD3nWzTMyDfXWYIfxGxEi4T7VPt/1JEiGQ0Hf5gF L9CynNUJk0gm2RA6vJWGAcyfot07VnPZur/ag6UI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729157AbgHURXr (ORCPT ); Fri, 21 Aug 2020 13:23:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:48448 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726300AbgHUQPi (ORCPT ); Fri, 21 Aug 2020 12:15:38 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 509C922C9F; Fri, 21 Aug 2020 16:15:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598026538; bh=8Ehh7V2FSQcjIFlLPGKbe+IttvqyB6gO7LC3jyQuRE0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CuLdhutp8gMQh9f/keMaD3nWM7sJABFGBTpB6c70LYq8xYNgoKKfVLJnvpvcQLBSM fAoohbW2lp2Q1WW7B0A9uBIixGDUSJpiF3WCit/uokmifdiEL6zfvx4kaDlqcuvDHN v/mX8VRQ2psu9H+scRz2k49+MOdH1We96010thNQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Xiubo Li , Jeff Layton , Ilya Dryomov , Sasha Levin , ceph-devel@vger.kernel.org Subject: [PATCH AUTOSEL 5.8 58/62] ceph: do not access the kiocb after aio requests Date: Fri, 21 Aug 2020 12:14:19 -0400 Message-Id: <20200821161423.347071-58-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200821161423.347071-1-sashal@kernel.org> References: <20200821161423.347071-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xiubo Li [ Upstream commit d1d9655052606fd9078e896668ec90191372d513 ] In aio case, if the completion comes very fast just before the ceph_read_iter() returns to fs/aio.c, the kiocb will be freed in the completion callback, then if ceph_read_iter() access again we will potentially hit the use-after-free bug. [ jlayton: initialize direct_lock early, and use it everywhere ] URL: https://tracker.ceph.com/issues/45649 Signed-off-by: Xiubo Li Signed-off-by: Jeff Layton Signed-off-by: Ilya Dryomov Signed-off-by: Sasha Levin --- fs/ceph/file.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 160644ddaeed7..d51c3f2fdca02 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -1538,6 +1538,7 @@ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) struct inode *inode = file_inode(filp); struct ceph_inode_info *ci = ceph_inode(inode); struct page *pinned_page = NULL; + bool direct_lock = iocb->ki_flags & IOCB_DIRECT; ssize_t ret; int want, got = 0; int retry_op = 0, read = 0; @@ -1546,7 +1547,7 @@ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode); - if (iocb->ki_flags & IOCB_DIRECT) + if (direct_lock) ceph_start_io_direct(inode); else ceph_start_io_read(inode); @@ -1603,7 +1604,7 @@ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) } ceph_put_cap_refs(ci, got); - if (iocb->ki_flags & IOCB_DIRECT) + if (direct_lock) ceph_end_io_direct(inode); else ceph_end_io_read(inode); -- 2.25.1