2021-03-21 22:37:31 +00:00
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#!/bin/sh
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echo "==> Amending boot.img for Amazon signature verification exploit"
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SOHO_HEADER_DATA='\x50\x03\x00\x00\x00\x25\xe4\x00'
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SOHO_HEADER_SIZE=848
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SOHO_HEADER_OFFSET=52
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tempfile=$(mktemp)
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2021-10-13 20:15:56 +00:00
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bootimgfile=$(echo "${1}" | sed 's/initramfs/boot.img/g')
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2021-03-21 22:37:31 +00:00
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dd if=/dev/zero of="${tempfile}" bs=$SOHO_HEADER_SIZE count=1
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printf "%b" $SOHO_HEADER_DATA | dd of="${tempfile}" bs=$SOHO_HEADER_OFFSET seek=1 conv=notrunc
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cat "${bootimgfile}" >> "${tempfile}"
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mv "${tempfile}" "${bootimgfile}"
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