freebsd-dev/sys/conf/ldscript.kmod.amd64
Mark Johnston a211ca52cd 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
2019-10-17 21:39:23 +00:00

49 lines
1.7 KiB
Plaintext

/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Mark Johnston <markj@FreeBSD.org>
*
* 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));
}
}