kernel-source/klp-symbols

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