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60 lines
1.6 KiB
Bash
Executable File
60 lines
1.6 KiB
Bash
Executable File
#!/bin/bash
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# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Standalone version of cros_resign_image.sh script from
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# chromeos/src/scripts/bin/ for use on signing servers.
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# Both the cgpt tool and vbutil_kernel should be in the system path.
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# Abort on error
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set -e
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# Check arguments
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if [ $# -ne 4 ] ; then
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echo "usage: $0 src_bin dst_bin kernel_datakey kernel_keyblock"
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exit 1
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fi
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# Make sure the tools we need are available.
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type -P cgpt &>/dev/null || \
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{ echo "cgpt tool not found."; exit 1; }
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type -P vbutil_kernel &>/dev/null || \
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{ echo "vbutil_kernel tool not found."; exit 1; }
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sector_size=512 # sector size in bytes
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num_sectors_vb=128 # number of sectors in kernel verification blob
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src_bin=$1
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dst_bin=$2
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kernel_datakey=$3
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kernel_keyblock=$4
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koffset="$(cgpt show -b -i 2 $1)"
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ksize="$(cgpt show -s -i 2 $1)"
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echo "Re-signing image ${src_bin} and outputting ${dst_bin}"
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temp_kimage=$(mktemp)
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trap "rm -f ${temp_kimage}" EXIT
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temp_out_vb=$(mktemp)
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trap "rm -f ${temp_out_vb}" EXIT
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# Grab the kernel image in preparation for resigning
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dd if="${src_bin}" of="${temp_kimage}" skip=$koffset bs=$sector_size \
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count=$ksize
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vbutil_kernel \
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--repack "${temp_out_vb}" \
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--vblockonly \
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--keyblock "${kernel_keyblock}" \
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--signprivate "${kernel_datakey}" \
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--oldblob "${temp_kimage}"
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# Create a copy of the input image and put in the new vblock
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cp "${src_bin}" "${dst_bin}"
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dd if="${temp_out_vb}" of="${dst_bin}" seek=$koffset bs=$sector_size \
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count=$num_sectors_vb conv=notrunc
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echo "New signed image was output to ${dst_bin}"
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