mirror of
https://github.com/ibm-s390-linux/s390-tools.git
synced 2026-08-05 02:14:52 +00:00
26148740df
Adds:
* extract_hdr_from_image
a bash script to extract the SE header from an SE image.
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Acked-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
90 lines
2.2 KiB
Bash
Executable File
90 lines
2.2 KiB
Bash
Executable File
#!/bin/bash
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#
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# pvextract_hdr - extract an IBM Secure Execution header from the Image
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#
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# Sample:
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# ./pvextract-hdr -o sehdr.bin se-image.bin
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#
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# Copyright IBM Corp. 2022
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#
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# s390-tools is free software; you can redistribute it and/or modify
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# it under the terms of the MIT license. See LICENSE for details.
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set -o pipefail
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set -o nounset
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set -e
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def_output="sehdr.bin"
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def_skip=0x14
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def_len=0x4
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usage() {
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cat <<-EOF
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Usage: $(basename "$0") [-o ${def_output}] [-s ${def_skip}] [-l ${def_len}] FILE
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Extract the header of the SE-image located in FILE.
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By default ${def_skip} pages will be skipped until starting to search
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for the header. By default the search will be stopped after ${def_len} pages.
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'${def_output}' is the default output file name.
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EOF
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}
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function check_file() {
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[ -e "$1" ] ||
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{ echo "ERROR: File '$1' not found" >&2 && exit 1; }
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}
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function check_hdr_ver() {
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local hdr_start="$1"
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local input="$2"
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xxd -s $((hdr_start + 8)) -l 4 "$input" | grep -q "000 0100" ||
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{ echo -n "WARNING: unknown hdr version " &&
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xxd -s $((hdr_start + 8)) -l 4 "$input" | awk '{print "0x" $2 $3}'; }
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}
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output=${def_output}
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parsed_skip=${def_skip}
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parsed_len=${def_len}
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# the last argument must be the input file
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input="${*: -1}"
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while getopts 'o:s:l:h' OPTION; do
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case "$OPTION" in
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o) output="$OPTARG" ;;
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s) parsed_skip="$OPTARG" ;;
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l) parsed_len="$OPTARG" ;;
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h)
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usage
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exit 0
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;;
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:)
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echo "ERROR: Must supply an argument to -$OPTARG." >&2
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exit 1
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;;
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*)
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usage
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exit 1
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;;
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esac
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done
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#argument specify pages; convert to bytes
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skip=$((parsed_skip * 0x1000))
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len=$((parsed_len * 0x1000))
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if [ $# -eq 0 ]; then
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echo "ERROR: Input not set. Use '$(basename "$0") [FILE]' to specify the Input file" >&2
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exit 1
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fi
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check_file "$input"
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hdr_start=$(xxd -s $((skip)) -l $((len)) "${input}" | grep IBMSecEx || { echo ERROR: "${input} does not contain an SE header." >&2 && exit 1; })
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hdr_start=$(echo "${hdr_start}" | awk '{print "0x" $1}' | cut -c 1-10)
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echo "SE header found at offset ${hdr_start}"
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check_hdr_ver "$hdr_start" "$input"
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size=$(xxd -s $((hdr_start + 12)) -l 4 "${input}" | awk 'NR==1 {print "0x" $2 $3}')
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dd if="${input}" of="${output}" bs=1 count=$((size)) skip=$((hdr_start)) status=none
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echo "SE header written to '${output}' ($((size)) bytes)"
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