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 3167CC4332F for ; Wed, 24 Nov 2021 12:16:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242905AbhKXMT4 (ORCPT ); Wed, 24 Nov 2021 07:19:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:48678 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243442AbhKXMQO (ORCPT ); Wed, 24 Nov 2021 07:16:14 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6CFCE61055; Wed, 24 Nov 2021 12:10:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637755825; bh=+bdIiUoHP9Fp5Dc1Y5Ulu+tOrTY4LE/i5crI1aSVLkA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q5Zq8RoMYTSbYlAhhf7l9WGuwKR/2KLBtiZ2Mcjq/om66pG6ihhIqeJGHlccYa2fJ 1cpyVr3+qVEkbOpcfpq/yGSscivDm4No+ovxwbljB8q08wOw7tPYbndKUFkmib88Fh 45BNX78/ZTx3FBrUH4EZxT/6NqksDmopPEtmCURE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Steven Rostedt (VMware)" , Sasha Levin Subject: [PATCH 4.9 072/207] tracefs: Have tracefs directories not set OTH permission bits by default Date: Wed, 24 Nov 2021 12:55:43 +0100 Message-Id: <20211124115706.248019376@linuxfoundation.org> X-Mailer: git-send-email 2.34.0 In-Reply-To: <20211124115703.941380739@linuxfoundation.org> References: <20211124115703.941380739@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: stable@vger.kernel.org From: Steven Rostedt (VMware) [ Upstream commit 49d67e445742bbcb03106b735b2ab39f6e5c56bc ] The tracefs file system is by default mounted such that only root user can access it. But there are legitimate reasons to create a group and allow those added to the group to have access to tracing. By changing the permissions of the tracefs mount point to allow access, it will allow group access to the tracefs directory. There should not be any real reason to allow all access to the tracefs directory as it contains sensitive information. Have the default permission of directories being created not have any OTH (other) bits set, such that an admin that wants to give permission to a group has to first disable all OTH bits in the file system. Link: https://lkml.kernel.org/r/20210818153038.664127804@goodmis.org Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Sasha Levin --- fs/tracefs/inode.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c index 21d36d2847356..985cccfcedad9 100644 --- a/fs/tracefs/inode.c +++ b/fs/tracefs/inode.c @@ -429,7 +429,8 @@ static struct dentry *__create_dir(const char *name, struct dentry *parent, if (unlikely(!inode)) return failed_creating(dentry); - inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO; + /* Do not set bits for OTH */ + inode->i_mode = S_IFDIR | S_IRWXU | S_IRUSR| S_IRGRP | S_IXUSR | S_IXGRP; inode->i_op = ops; inode->i_fop = &simple_dir_operations; -- 2.33.0