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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9366AC4332F for ; Tue, 16 Nov 2021 00:52:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8127163252 for ; Tue, 16 Nov 2021 00:52:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245702AbhKPAzb (ORCPT ); Mon, 15 Nov 2021 19:55:31 -0500 Received: from mail.kernel.org ([198.145.29.99]:44604 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245714AbhKOTVD (ORCPT ); Mon, 15 Nov 2021 14:21:03 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3AAB763592; Mon, 15 Nov 2021 18:39:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637001588; bh=atfDwvUuGlvjIH03i7FZfpUwh6oVHDSwLcALcF/hekA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TwtZzbCPWx34s85190ME1LisrgYStC2BtVO1MGcVh7Sx2S+mZTqRQo/Z3hNGwi+Yn dbfNziVPKmS5C5MCTYKYPdWv5sb8E9w1fVBG03RjrhiN9UhCuUsFsKhlYSXil02Z70 esgwEcY8TsPTXvIolsZaC+bua+a+iWAhHY9ZcHgE= 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 5.15 248/917] tracefs: Have tracefs directories not set OTH permission bits by default Date: Mon, 15 Nov 2021 17:55:43 +0100 Message-Id: <20211115165437.208203304@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165428.722074685@linuxfoundation.org> References: <20211115165428.722074685@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 1261e8b41edb4..925a621b432e3 100644 --- a/fs/tracefs/inode.c +++ b/fs/tracefs/inode.c @@ -432,7 +432,8 @@ 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