2dd51e16ca
The script originally supported embedding an mfs into ELF files or any other type of file, because it searched for magic strings to mark the beginning and end of the embeddable section. It was later modified to read the section offset and length via readelf, which made it work for ELF only. Restore the ability to update arbitrary file types by using the readelf technique for ELF, and the magic string technique for all others (including PE/COFF files like loader.efi). Submitted by: Zakary Nafziger <worldofzak@gmail.com> MFC after: 1 month Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D12746
86 lines
3.1 KiB
Bash
86 lines
3.1 KiB
Bash
#!/bin/sh
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#
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# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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#
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# Copyright (C) 2008 The FreeBSD Project. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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# Embed an MFS image into the kernel body or the loader body (expects space
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# reserved via MD_ROOT_SIZE (kernel) or MD_IMAGE_SIZE (loader))
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#
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# $1: kernel or loader filename
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# $2: MFS image filename
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#
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if [ $# -ne 2 ]; then
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echo "usage: $(basename $0) target mfs_image"
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exit 0
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fi
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if [ ! -w "$1" ]; then
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echo $1 not writable
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exit 1
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fi
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mfs_size=`stat -f '%z' $2 2> /dev/null`
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# If we can't determine MFS image size - bail.
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[ -z ${mfs_size} ] && echo "Can't determine MFS image size" && exit 1
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err_no_mfs="Can't locate mfs section within "
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if [ `file -b $1 | grep -q '^ELF ..-bit .SB executable'` ]; then
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sec_info=`elfdump -c $1 2> /dev/null | grep -A 5 -E "sh_name: oldmfs$"`
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# If we can't find the mfs section within the given kernel - bail.
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[ -z "${sec_info}" ] && echo "${err_no_mfs} $1" && exit 1
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sec_size=`echo "${sec_info}" | awk '/sh_size/ {print $2}' 2>/dev/null`
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sec_start=`echo "${sec_info}" | \
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awk '/sh_offset/ {print $2}' 2>/dev/null`
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else
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#try to find start byte of MFS start flag otherwise - bail.
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sec_start=`strings -at d $1 | grep "MFS Filesystem goes here"` || \
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{ echo "${err_no_mfs} $1"; exit 1; }
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sec_start=`echo ${sec_start} | awk '{print $1}'`
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#try to find start byte of MFS end flag otherwise - bail.
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sec_end=`strings -at d $1 | \
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grep "MFS Filesystem had better STOP here"` || \
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{ echo "${err_no_mfs} $1"; exit 1; }
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sec_end=`echo ${sec_end} | awk '{print $1}'`
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#calculate MFS section size
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sec_size=`expr ${sec_end} - ${sec_start}`
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fi
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# If the mfs section size is smaller than the mfs image - bail.
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[ ${sec_size} -lt ${mfs_size} ] && echo "MFS image too large" && exit 1
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# Dump the mfs image into the mfs section
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dd if=$2 ibs=8192 of=$1 obs=${sec_start} oseek=1 conv=notrunc 2> /dev/null && \
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echo "MFS image embedded into $1" && exit 0
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