From owner-svn-src-all@freebsd.org Thu Oct 17 21:39:24 2019 Return-Path: Delivered-To: svn-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id A0EE715E59A; Thu, 17 Oct 2019 21:39:24 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 46vMxm3ltpz3HDQ; Thu, 17 Oct 2019 21:39:24 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 64CC326B9E; Thu, 17 Oct 2019 21:39:24 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x9HLdOw9071415; Thu, 17 Oct 2019 21:39:24 GMT (envelope-from markj@FreeBSD.org) Received: (from markj@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x9HLdOGl071414; Thu, 17 Oct 2019 21:39:24 GMT (envelope-from markj@FreeBSD.org) Message-Id: <201910172139.x9HLdOGl071414@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: markj set sender to markj@FreeBSD.org using -f From: Mark Johnston Date: Thu, 17 Oct 2019 21:39:24 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r353701 - head/sys/conf X-SVN-Group: head X-SVN-Commit-Author: markj X-SVN-Commit-Paths: head/sys/conf X-SVN-Commit-Revision: 353701 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Oct 2019 21:39:24 -0000 Author: markj Date: Thu Oct 17 21:39:23 2019 New Revision: 353701 URL: https://svnweb.freebsd.org/changeset/base/353701 Log: Add an ldscript for amd64 kernel modules. Use it to pad the text and read-only data sections to a 4KB boundary. This will be used to enforce strict memory protections for some sections of loadable kernel modules. Reviewed by: kib MFC after: 2 weeks Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D21970 Added: head/sys/conf/ldscript.kmod.amd64 (contents, props changed) Added: head/sys/conf/ldscript.kmod.amd64 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/conf/ldscript.kmod.amd64 Thu Oct 17 21:39:23 2019 (r353701) @@ -0,0 +1,48 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2019 Mark Johnston + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + + /* + * Coalesce executable and read-only sections, and pad to page alignment so + * that memory protections can be strictly enforced. + */ + +SECTIONS +{ + .text : + { + *(.text .text.*) + . = ALIGN(CONSTANT(COMMONPAGESIZE)); + } + + .rodata : + { + *(.rodata .rodata.*) + . = ALIGN(CONSTANT(COMMONPAGESIZE)); + } +}