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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,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 0BDDAC49ED7 for ; Fri, 20 Sep 2019 21:31:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CAEDC2080F for ; Fri, 20 Sep 2019 21:31:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569015081; bh=K1XKfl1E4n/4AYgHzqCbFj+SYp7RMDnxwNgkzlIr6u8=; h=From:To:Subject:Date:In-Reply-To:References:List-ID:From; b=0oWuAKxf1wrtoc89TSqoXkrsOOXVwEjXWm1b4WWg5ONHNSGE+cCfPkrbHe6CBmm40 7Oj7cBzSR0mZJ591b3qACryc2aQxMNVAabcM49EUTVDMcOhx93Wd7vu3sbkEe2DSfX 3c/8RRAqWkWB0Y0OZORorLYCdlcwbnzpFfPOeX6g= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389650AbfITVbV (ORCPT ); Fri, 20 Sep 2019 17:31:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:39378 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729725AbfITVbV (ORCPT ); Fri, 20 Sep 2019 17:31:21 -0400 Received: from ebiggers-linuxstation.mtv.corp.google.com (unknown [104.132.1.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 98BF720B7C for ; Fri, 20 Sep 2019 21:31:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569015080; bh=K1XKfl1E4n/4AYgHzqCbFj+SYp7RMDnxwNgkzlIr6u8=; h=From:To:Subject:Date:In-Reply-To:References:From; b=Llu57tAW4C/oJTO/BlBU+YvouPbdBAekovXEJvC2FzmiscCgSDxpTMUxHidBvasd7 p2T6sHg/1EDKZg7shijB1Ay6H1GiDG1M7Hv0rUiRLDD46BUUfWh8yyfTbUwMgM9I1u 4oJ81xBxq25fAAGa3wt8uvI3HRP4w7qDO2KEjY6Q= From: Eric Biggers To: linux-ext4@vger.kernel.org Subject: [PATCH 3/6] ext4.5: document the verity feature Date: Fri, 20 Sep 2019 14:29:51 -0700 Message-Id: <20190920212954.205789-4-ebiggers@kernel.org> X-Mailer: git-send-email 2.23.0.351.gc4317032e6-goog In-Reply-To: <20190920212954.205789-1-ebiggers@kernel.org> References: <20190920212954.205789-1-ebiggers@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org From: Eric Biggers Signed-off-by: Eric Biggers --- misc/ext4.5.in | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/misc/ext4.5.in b/misc/ext4.5.in index 40e75f81..627c0dad 100644 --- a/misc/ext4.5.in +++ b/misc/ext4.5.in @@ -312,6 +312,18 @@ the file system using and it also speeds up the time required for .BR mke2fs (8) to create the file system. +.TP +.B verity +.br +Enables support for verity protected files. Verity files are readonly, +and their data is transparently verified against a Merkle tree hidden +past the end of the file. Using the Merkle tree's root hash, a verity +file can be efficiently authenticated, independent of the file's size. +.IP +This feature is most useful for authenticating important read-only files +on read-write file systems. If the file system itself is read-only, +then using dm-verity to authenticate the entire block device may provide +much better security. .SH MOUNT OPTIONS This section describes mount options which are specific to ext2, ext3, and ext4. Other generic mount options may be used as well; see @@ -774,6 +786,8 @@ ext4, 4.13 ext4, 4.13 .IP "\fBcasefold\fR" 2i ext4, 5.2 +.IP "\fBverity\fR" 2i +ext4, 5.4 .SH SEE ALSO .BR mke2fs (8), .BR mke2fs.conf (5), -- 2.23.0.351.gc4317032e6-goog