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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 5940EC2BB1D for ; Fri, 13 Mar 2020 23:56:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3BB2C20637 for ; Fri, 13 Mar 2020 23:56:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728209AbgCMX4U (ORCPT ); Fri, 13 Mar 2020 19:56:20 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:50106 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727788AbgCMXyD (ORCPT ); Fri, 13 Mar 2020 19:54:03 -0400 Received: from viro by ZenIV.linux.org.uk with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jCu7u-00B6cD-HN; Fri, 13 Mar 2020 23:54:02 +0000 From: Al Viro To: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Linus Torvalds Subject: [RFC][PATCH v4 41/69] path_connected(): pass mount and dentry separately Date: Fri, 13 Mar 2020 23:53:29 +0000 Message-Id: <20200313235357.2646756-41-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200313235357.2646756-1-viro@ZenIV.linux.org.uk> References: <20200313235303.GP23230@ZenIV.linux.org.uk> <20200313235357.2646756-1-viro@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Al Viro eventually we'll want to do that check *before* mangling nd->path.dentry... Signed-off-by: Al Viro --- fs/namei.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 6530e3cbd486..2bf9f605c46f 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -550,22 +550,20 @@ static int __nd_alloc_stack(struct nameidata *nd) } /** - * path_connected - Verify that a path->dentry is below path->mnt.mnt_root - * @path: nameidate to verify + * path_connected - Verify that a dentry is below mnt.mnt_root * * Rename can sometimes move a file or directory outside of a bind * mount, path_connected allows those cases to be detected. */ -static bool path_connected(const struct path *path) +static bool path_connected(struct vfsmount *mnt, struct dentry *dentry) { - struct vfsmount *mnt = path->mnt; struct super_block *sb = mnt->mnt_sb; /* Bind mounts and multi-root filesystems can have disconnected paths */ if (!(sb->s_iflags & SB_I_MULTIROOT) && (mnt->mnt_root == sb->s_root)) return true; - return is_subdir(path->dentry, mnt->mnt_root); + return is_subdir(dentry, mnt->mnt_root); } static inline int nd_alloc_stack(struct nameidata *nd) @@ -1386,7 +1384,7 @@ static int follow_dotdot_rcu(struct nameidata *nd) return -ECHILD; nd->path.dentry = parent; nd->seq = seq; - if (unlikely(!path_connected(&nd->path))) + if (unlikely(!path_connected(nd->path.mnt, parent))) return -ECHILD; break; } else { @@ -1448,7 +1446,7 @@ static int path_parent_directory(struct path *path) /* rare case of legitimate dget_parent()... */ path->dentry = dget_parent(path->dentry); dput(old); - if (unlikely(!path_connected(path))) + if (unlikely(!path_connected(path->mnt, path->dentry))) return -ENOENT; return 0; } -- 2.11.0