#!/bin/bash
# The purpose of this test script is to determine if create-diff-object can
# properly recognize object file equivalence when passed the same file for both
# the original and patched objects. This verifies that create-diff-object is
# correctly parsing, correlating, and comparing the different elements of the
# object file. In practice, a situation similar to the test case occurs when a
# commonly included header file changes, causing Make to rebuild many objects
# that have no functional change.
# This script requires a built kernel object tree to be in the kpatch cache
# directory at $HOME/.kpatch/obj
#set -x
OBJDIR="$HOME/.kpatch/obj"
# shellcheck disable=SC2046
SCRIPTDIR=$(readlink -f $(dirname $(type -p "$0")))
TEMPDIR=$(mktemp -d)
RESULTSDIR="$TEMPDIR/results"
if [[ ! -d $OBJDIR ]]; then
echo "please run kpatch-build to populate the object tree in $OBJDIR"
fi
cd "$OBJDIR" || exit 1
# shellcheck disable=SC2044
for i in $(find ./* -name '*.o')
do
# copied from kpatch-build/kpatch-gcc; keep in sync
case $i in
*.mod.o|\
*built-in.o|\
*built-in.a|\
vmlinux.o|\
.tmp_kallsyms1.o|\
.tmp_kallsyms2.o|\
init/version.o|\
arch/x86/boot/version.o|\
arch/x86/boot/compressed/eboot.o|\
arch/x86/boot/header.o|\
arch/x86/boot/compressed/efi_stub_64.o|\
arch/x86/boot/compressed/piggy.o|\
kernel/system_certificates.o|\
.*.o)
continue
;;
esac
# skip objects that are the linked product of more than one object file
[[ $(readelf -s "$i" | awk '$4=="FILE" {n++} END {print n}') -ne 1 ]] && continue
"$SCRIPTDIR"/../kpatch-build/create-diff-object "$i" "$i" "/usr/lib/debug/lib/modules/$(uname -r)/vmlinux" "$TEMPDIR/output.o" > "$TEMPDIR/log.txt" 2>&1
RETCODE=$?
# expect RETCODE to be 3 indicating no change
[[ $RETCODE -eq 3 ]] && continue
# otherwise record error
# shellcheck disable=SC2046
mkdir -p "$RESULTSDIR"/$(dirname "$i") || exit 1
cp "$i" "$RESULTSDIR/$i" || exit 1
case $RETCODE in
139)
echo "$i: segfault" | tee
if [[ ! -e core ]]; then
echo "no corefile, run "ulimit -c unlimited" to capture corefile"
else
mv core "$RESULTSDIR/$i.core" || exit 1
fi
;;
0)
echo "$i: incorrectly detected change"
mv "$TEMPDIR/log.txt" "$RESULTSDIR/$i.log" || exit 1
;;
1|2)
echo "$i: error code $RETCODE"
mv "$TEMPDIR/log.txt" "$RESULTSDIR/$i.log" || exit 1
;;
*)
exit 1 # script error
;;
esac
done
rm -f "$TEMPDIR/log.txt" > /dev/null 2>&1
# try to group the errors together in some meaningful way
cd "$RESULTSDIR" || exit 1
echo ""
echo "Results:"
# shellcheck disable=SC2044
for i in $(find ./* -iname '*.log')
do
head -1 "$i" | cut -f2-3 -d':'
done | sort | uniq -c | sort -n -r | tee "$TEMPDIR/results.log"
echo "results are in $TEMPDIR"