73 lines
1.9 KiB
Plaintext
73 lines
1.9 KiB
Plaintext
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#!/bin/bash
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set -e
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export LC_COLLATE=C
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usage()
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{
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echo "Tool to generate list of symbols that are used to build kernel livepatches"
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echo
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echo "Usage: ${0##*/} kernel_build_dir klp_symbols"
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echo " kernel_build_dir Directory where to find the built kernel binaries"
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echo " klp_symbols Output file with the list of symbols"
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}
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if test "$1" == "-h" -o "$1" == "--help" -o $# -ne 2 ; then
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usage >&2
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exit 1
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fi
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KLP_DATA_VERSION="0.1"
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KERNEL_BUILD_DIR="$1"
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KLP_SYMBOLS="$2"
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VMLINUX="$KERNEL_BUILD_DIR/vmlinux"
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MODVER_DIR="$KERNEL_BUILD_DIR/.tmp_versions"
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if ! test -f "$VMLINUX" ; then
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echo "Error: Cannot open file: $VMLINUX" >&2
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exit 1
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fi
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if ! test -d "$MODVER_DIR" ; then
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# kernel >= 5.3 has *.mod in the build tree
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mod_cnt=$(find "$KERNEL_BUILD_DIR" -name '*.mod' | wc -l)
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if [ $mod_cnt -eq 0 ]; then
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echo "Error: Directory does not exist: $MODVER_DIR" >&2
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exit 1
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fi
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MODVER_DIR="$KERNEL_BUILD_DIR"
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fi
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get_symbols()
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{
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nm -f posix "$1" | grep -v '\( [UN] \)\|\(\.L\|__crc_\)' | cut -d\ -f1
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}
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echo "klp-convert-symbol-data.$KLP_DATA_VERSION" > "$KLP_SYMBOLS"
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echo "*vmlinux" >> "$KLP_SYMBOLS"
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get_symbols "$VMLINUX" >> "$KLP_SYMBOLS"
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find "$MODVER_DIR" -iname '*.mod' | sort | while read KMOD ; do
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if [ "$MODVER_DIR" = "$KERNEL_BUILD_DIR" ]; then
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# kernel >= 5.3, just replace the suffix
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KO_FILE="${KMOD%.mod}.ko"
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else
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# kernel <= 5.2, read .ko path and file from .mod file
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KO_FILE="$(head -n1 $KMOD)"
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fi
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# obtain module name and its object file by processing .ko file name
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NO_SUFFIX="$(basename -s .ko $KO_FILE)"
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KMOD_NAME="$(echo $NO_SUFFIX | sed 's/-/_/g')"
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OBJ_FILE="$(dirname $KO_FILE)/$NO_SUFFIX.o"
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# write module name to Symbols file
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echo "*$KMOD_NAME" >> "$KLP_SYMBOLS"
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# extract symbols from object file and write them to Symbols file
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get_symbols "$OBJ_FILE" >> "$KLP_SYMBOLS"
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done
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exit 0
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