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=-19.1 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=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 F3EF3C433ED for ; Mon, 17 May 2021 15:34:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D9D636101E for ; Mon, 17 May 2021 15:34:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243186AbhEQPff (ORCPT ); Mon, 17 May 2021 11:35:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:55936 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244425AbhEQPUj (ORCPT ); Mon, 17 May 2021 11:20:39 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 90B7C6191D; Mon, 17 May 2021 14:34:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621262059; bh=VDx8O+U6Cb9HQVTvwF8B4BPQlbaXtvFBDUjVbfchoVM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0qTf+6tkweQ9HAV8fsoD/LKgHZ+dCeHVh119PCdEiCmY8iVHAp1OLrmdufs/NSXuo j3wBVU3otFG5Za/hLfAhi6zcaouN8xq2yTUh5XbV3TS5/25yVbczw1wsNDl3yX75qg EKa+4gpIQeLYky3/oZ066OfaeIdEWO548qeLXz/M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yunlei He , Eric Biggers , Chao Yu , Jaegeuk Kim Subject: [PATCH 5.4 131/141] f2fs: fix error handling in f2fs_end_enable_verity() Date: Mon, 17 May 2021 16:03:03 +0200 Message-Id: <20210517140247.226544995@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210517140242.729269392@linuxfoundation.org> References: <20210517140242.729269392@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Eric Biggers commit 3c0315424f5e3d2a4113c7272367bee1e8e6a174 upstream. f2fs didn't properly clean up if verity failed to be enabled on a file: - It left verity metadata (pages past EOF) in the page cache, which would be exposed to userspace if the file was later extended. - It didn't truncate the verity metadata at all (either from cache or from disk) if an error occurred while setting the verity bit. Fix these bugs by adding a call to truncate_inode_pages() and ensuring that we truncate the verity metadata (both from cache and from disk) in all error paths. Also rework the code to cleanly separate the success path from the error paths, which makes it much easier to understand. Finally, log a message if f2fs_truncate() fails, since it might otherwise fail silently. Reported-by: Yunlei He Fixes: 95ae251fe828 ("f2fs: add fs-verity support") Cc: # v5.4+ Signed-off-by: Eric Biggers Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Greg Kroah-Hartman --- fs/f2fs/verity.c | 79 ++++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 56 insertions(+), 23 deletions(-) --- a/fs/f2fs/verity.c +++ b/fs/f2fs/verity.c @@ -150,40 +150,73 @@ static int f2fs_end_enable_verity(struct size_t desc_size, u64 merkle_tree_size) { struct inode *inode = file_inode(filp); + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); u64 desc_pos = f2fs_verity_metadata_pos(inode) + merkle_tree_size; struct fsverity_descriptor_location dloc = { .version = cpu_to_le32(1), .size = cpu_to_le32(desc_size), .pos = cpu_to_le64(desc_pos), }; - int err = 0; + int err = 0, err2 = 0; - if (desc != NULL) { - /* Succeeded; write the verity descriptor. */ - err = pagecache_write(inode, desc, desc_size, desc_pos); - - /* Write all pages before clearing FI_VERITY_IN_PROGRESS. */ - if (!err) - err = filemap_write_and_wait(inode->i_mapping); - } - - /* If we failed, truncate anything we wrote past i_size. */ - if (desc == NULL || err) - f2fs_truncate(inode); + /* + * If an error already occurred (which fs/verity/ signals by passing + * desc == NULL), then only clean-up is needed. + */ + if (desc == NULL) + goto cleanup; + + /* Append the verity descriptor. */ + err = pagecache_write(inode, desc, desc_size, desc_pos); + if (err) + goto cleanup; + + /* + * Write all pages (both data and verity metadata). Note that this must + * happen before clearing FI_VERITY_IN_PROGRESS; otherwise pages beyond + * i_size won't be written properly. For crash consistency, this also + * must happen before the verity inode flag gets persisted. + */ + err = filemap_write_and_wait(inode->i_mapping); + if (err) + goto cleanup; + + /* Set the verity xattr. */ + err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_VERITY, + F2FS_XATTR_NAME_VERITY, &dloc, sizeof(dloc), + NULL, XATTR_CREATE); + if (err) + goto cleanup; + + /* Finally, set the verity inode flag. */ + file_set_verity(inode); + f2fs_set_inode_flags(inode); + f2fs_mark_inode_dirty_sync(inode, true); clear_inode_flag(inode, FI_VERITY_IN_PROGRESS); + return 0; - if (desc != NULL && !err) { - err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_VERITY, - F2FS_XATTR_NAME_VERITY, &dloc, sizeof(dloc), - NULL, XATTR_CREATE); - if (!err) { - file_set_verity(inode); - f2fs_set_inode_flags(inode); - f2fs_mark_inode_dirty_sync(inode, true); - } +cleanup: + /* + * Verity failed to be enabled, so clean up by truncating any verity + * metadata that was written beyond i_size (both from cache and from + * disk) and clearing FI_VERITY_IN_PROGRESS. + * + * Taking i_gc_rwsem[WRITE] is needed to stop f2fs garbage collection + * from re-instantiating cached pages we are truncating (since unlike + * normal file accesses, garbage collection isn't limited by i_size). + */ + down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); + truncate_inode_pages(inode->i_mapping, inode->i_size); + err2 = f2fs_truncate(inode); + if (err2) { + f2fs_err(sbi, "Truncating verity metadata failed (errno=%d)", + err2); + set_sbi_flag(sbi, SBI_NEED_FSCK); } - return err; + up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); + clear_inode_flag(inode, FI_VERITY_IN_PROGRESS); + return err ?: err2; } static int f2fs_get_verity_descriptor(struct inode *inode, void *buf,