From patchwork Thu Apr 16 13:24:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 227826 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 4D5E2C2BB55 for ; Thu, 16 Apr 2020 13:50:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1690120732 for ; Thu, 16 Apr 2020 13:50:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587045051; bh=SoVqO3bK3jHNnFnqoHbBV+IZFxZYUJeXCaLy+Ihncvo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=vatkettwZgaAubdgnb/ueIkVzOm9r5IDbdnwH/FrxyHED2DEstDCmCksszQ4eFf5b +PXIgB7cVYC7YdmlugA5+bD+ZqgV5kL2KRFxISqWsnF1Yau0GOkURyrLkP/ydNHwko 0pjAo/qlp/G9LPRxS6pN7tW8ID4+OoIaoKMm17Sw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731485AbgDPNuo (ORCPT ); Thu, 16 Apr 2020 09:50:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:36626 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732673AbgDPNuh (ORCPT ); Thu, 16 Apr 2020 09:50:37 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6E3FC2078B; Thu, 16 Apr 2020 13:50:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587045035; bh=SoVqO3bK3jHNnFnqoHbBV+IZFxZYUJeXCaLy+Ihncvo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cZlZZNE42wDifE3HxD0bUQfdG1hPfUcFISsrcF07BipIPJORRarveAz86Jf6YorOC vcgTGOjhAuYs3ZTl3YNiJ6cu5PdTcc+7HUNic53Kjz0AFrP2qyEJBNNqjxT2C2Is+J VNdvBjDq/E1oguEtMdmAUhaFzohKEYv0+GLUfeZI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Simon Gander , Andrew Morton , Anton Altaparmakov , Linus Torvalds Subject: [PATCH 5.4 203/232] hfsplus: fix crash and filesystem corruption when deleting files Date: Thu, 16 Apr 2020 15:24:57 +0200 Message-Id: <20200416131340.665541457@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131316.640996080@linuxfoundation.org> References: <20200416131316.640996080@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Simon Gander commit 25efb2ffdf991177e740b2f63e92b4ec7d310a92 upstream. When removing files containing extended attributes, the hfsplus driver may remove the wrong entries from the attributes b-tree, causing major filesystem damage and in some cases even kernel crashes. To remove a file, all its extended attributes have to be removed as well. The driver does this by looking up all keys in the attributes b-tree with the cnid of the file. Each of these entries then gets deleted using the key used for searching, which doesn't contain the attribute's name when it should. Since the key doesn't contain the name, the deletion routine will not find the correct entry and instead remove the one in front of it. If parent nodes have to be modified, these become corrupt as well. This causes invalid links and unsorted entries that not even macOS's fsck_hfs is able to fix. To fix this, modify the search key before an entry is deleted from the attributes b-tree by copying the found entry's key into the search key, therefore ensuring that the correct entry gets removed from the tree. Signed-off-by: Simon Gander Signed-off-by: Andrew Morton Reviewed-by: Anton Altaparmakov Cc: Link: http://lkml.kernel.org/r/20200327155541.1521-1-simon@tuxera.com Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- fs/hfsplus/attributes.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/fs/hfsplus/attributes.c +++ b/fs/hfsplus/attributes.c @@ -292,6 +292,10 @@ static int __hfsplus_delete_attr(struct return -ENOENT; } + /* Avoid btree corruption */ + hfs_bnode_read(fd->bnode, fd->search_key, + fd->keyoffset, fd->keylength); + err = hfs_brec_remove(fd); if (err) return err;