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The test covers: - Basic address remapping for user space samples. - Pipe mode coverage for `perf record` piped into `perf inject --aslr`. - Callchain address remapping. - Consistency of `perf report` output before and after injection. - Pipe mode report consistency. - Dropping of samples that leak ASLR info (physical addresses). - Kernel address remapping (skipping gracefully if permissions restrict recording the kernel map). - Kernel report consistency with address normalization. Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers --- tools/perf/tests/shell/inject_aslr.sh | 386 ++++++++++++++++++++++++++ 1 file changed, 386 insertions(+) create mode 100755 tools/perf/tests/shell/inject_aslr.sh diff --git a/tools/perf/tests/shell/inject_aslr.sh b/tools/perf/tests/shell/inject_aslr.sh new file mode 100755 index 000000000000..951809eecfd4 --- /dev/null +++ b/tools/perf/tests/shell/inject_aslr.sh @@ -0,0 +1,386 @@ +#!/bin/bash +# perf inject --aslr test +# SPDX-License-Identifier: GPL-2.0 + +shelldir=$(dirname "$0") +# shellcheck source=lib/perf_has_symbol.sh +. "${shelldir}"/lib/perf_has_symbol.sh + +sym="noploop" + +skip_test_missing_symbol ${sym} + +# Create global temp directory +temp_dir=$(mktemp -d /tmp/perf-test-aslr.XXXXXXXXXX) +data="${temp_dir}/perf.data" +data2="${temp_dir}/perf.data2" + +prog="perf test -w noploop" +[ "$(uname -m)" = "s390x" ] && prog="$prog 3" +err=0 + +set -e + +cleanup() { + # Check if temp_dir is set and looks sane before removing + if [[ "${temp_dir}" =~ ^/tmp/perf-test-aslr\. ]]; then + rm -rf "${temp_dir}" + fi + trap - EXIT TERM INT +} + +trap_cleanup() { + echo "Unexpected signal in ${FUNCNAME[1]}" + cleanup + exit 1 +} +trap trap_cleanup TERM INT + +get_noploop_addr() { + local file=$1 + perf script -i "$file" | awk '{for(i=1;i<=NF;i++) if($i ~ /noploop\+/) {print $(i-1); exit}}' +} + +test_basic_aslr() { + echo "Test basic ASLR remapping" + local data + data=$(mktemp /tmp/perf.data.basic.XXXXXX) + local data2 + data2=$(mktemp /tmp/perf.data2.basic.XXXXXX) + + perf record -e task-clock:u -o "${data}" ${prog} + perf inject -v --aslr -i "${data}" -o "${data2}" + + orig_addr=$(get_noploop_addr "${data}") + new_addr=$(get_noploop_addr "${data2}") + + echo "Basic ASLR: orig_addr=$orig_addr, new_addr=$new_addr" + + if [ -z "$orig_addr" ]; then + echo "Basic ASLR test [Failed - no noploop samples in original file]" + err=1 + elif [ -z "$new_addr" ]; then + echo "Basic ASLR test [Failed - could not find remapped address]" + err=1 + elif [ "$orig_addr" = "$new_addr" ]; then + echo "Basic ASLR test [Failed - addresses are not remapped]" + err=1 + else + echo "Basic ASLR test [Success]" + rm -f "${data}" "${data2}" "${data}.old" "${data2}.old" + fi +} + +test_pipe_aslr() { + echo "Test pipe mode ASLR remapping" + local data + data=$(mktemp /tmp/perf.data.pipe.XXXXXX) + local data2 + data2=$(mktemp /tmp/perf.data2.pipe.XXXXXX) + + # Use tee to save the original pipe data for comparison + perf record -e task-clock:u -o - ${prog} | tee "${data}" | perf inject --aslr -o "${data2}" + + orig_addr=$(get_noploop_addr "${data}") + new_addr=$(get_noploop_addr "${data2}") + + echo "Pipe ASLR: orig_addr=$orig_addr, new_addr=$new_addr" + + if [ -z "$orig_addr" ]; then + echo "Pipe ASLR test [Failed - no noploop samples in original file]" + err=1 + elif [ -z "$new_addr" ]; then + echo "Pipe ASLR test [Failed - could not find remapped address]" + err=1 + elif [ "$orig_addr" = "$new_addr" ]; then + echo "Pipe ASLR test [Failed - addresses are not remapped]" + err=1 + else + echo "Pipe ASLR test [Success]" + rm -f "${data}" "${data2}" "${data}.old" "${data2}.old" + fi +} + +test_callchain_aslr() { + echo "Test Callchain ASLR remapping" + local data + data=$(mktemp /tmp/perf.data.callchain.XXXXXX) + local data2 + data2=$(mktemp /tmp/perf.data2.callchain.XXXXXX) + + perf record -g -e task-clock:u -o "${data}" ${prog} + perf inject --aslr -i "${data}" -o "${data2}" + + orig_addr=$(get_noploop_addr "${data}") + new_addr=$(get_noploop_addr "${data2}") + + echo "Callchain ASLR: orig_addr=$orig_addr, new_addr=$new_addr" + + if [ -z "$orig_addr" ]; then + echo "Callchain ASLR test [Failed - no noploop samples in original file]" + err=1 + elif [ -z "$new_addr" ]; then + echo "Callchain ASLR test [Failed - could not find remapped address]" + err=1 + elif [ "$orig_addr" = "$new_addr" ]; then + echo "Callchain ASLR test [Failed - addresses are not remapped]" + err=1 + else + # Also check that the full script output differs (to cover callchains) + orig_script=$(perf script -i "${data}" | grep -A 5 noploop | head -n 20) + new_script=$(perf script -i "${data2}" | grep -A 5 noploop | head -n 20) + + if [ "$orig_script" = "$new_script" ]; then + echo "Callchain ASLR test [Failed - callchain output is identical]" + err=1 + else + echo "Callchain ASLR test [Success]" + rm -f "${data}" "${data2}" "${data}.old" "${data2}.old" + fi + fi +} + +test_report_aslr() { + echo "Test perf report consistency" + local data + data=$(mktemp /tmp/perf.data.report.XXXXXX) + local data2 + data2=$(mktemp /tmp/perf.data2.report.XXXXXX) + local data_clean + data_clean=$(mktemp /tmp/perf.data.clean.XXXXXX) + + perf record -e task-clock:u -o "${data}" ${prog} + # Use -b to inject build-ids and force ordered events processing in both + perf inject -b -i "${data}" -o "${data_clean}" + perf inject -v -b --aslr -i "${data}" -o "${data2}" + + local report1="${temp_dir}/report1" + local report2="${temp_dir}/report2" + local report1_clean="${temp_dir}/report1.clean" + local report2_clean="${temp_dir}/report2.clean" + local diff_file="${temp_dir}/diff" + + perf report -i "${data_clean}" --stdio > "${report1}" + perf report -i "${data2}" --stdio > "${report2}" + + # Strip headers and compare lines with percentages + grep '%' "${report1}" | grep -v '^#' | sort > "${report1_clean}" + grep '%' "${report2}" | grep -v '^#' | sort > "${report2_clean}" + + diff -u -w "${report1_clean}" "${report2_clean}" > "${diff_file}" || true + + if [ -s "${diff_file}" ]; then + echo "Report ASLR test [Failed - reports differ]" + echo "Showing first 20 lines of diff:" + head -n 20 "${diff_file}" + err=1 + else + echo "Report ASLR test [Success]" + fi + rm -f "${data}" "${data2}" "${data_clean}" "${data}.old" "${data2}.old" "${data_clean}.old" +} + +test_pipe_report_aslr() { + echo "Test pipe mode perf report consistency" + local data + data=$(mktemp /tmp/perf.data.pipe_report.XXXXXX) + local data2 + data2=$(mktemp /tmp/perf.data2.pipe_report.XXXXXX) + local data_clean + data_clean=$(mktemp /tmp/perf.data.clean.XXXXXX) + + # Use tee to save the original pipe data, then process it with inject -b + perf record -e task-clock:u -o - ${prog} | \ + tee "${data}" | \ + perf inject -b --aslr -o "${data2}" + perf inject -b -i "${data}" -o "${data_clean}" + + local report1="${temp_dir}/report1" + local report2="${temp_dir}/report2" + local report1_clean="${temp_dir}/report1.clean" + local report2_clean="${temp_dir}/report2.clean" + local diff_file="${temp_dir}/diff" + + perf report -i "${data_clean}" --stdio > "${report1}" + perf report -i "${data2}" --stdio > "${report2}" + + # Strip headers and compare lines with percentages + grep '%' "${report1}" | grep -v '^#' | sort > "${report1_clean}" + grep '%' "${report2}" | grep -v '^#' | sort > "${report2_clean}" + + diff -u -w "${report1_clean}" "${report2_clean}" > "${diff_file}" || true + + if [ -s "${diff_file}" ]; then + echo "Pipe Report ASLR test [Failed - reports differ]" + echo "Showing first 20 lines of diff:" + head -n 20 "${diff_file}" + err=1 + else + echo "Pipe Report ASLR test [Success]" + fi + rm -f "${data}" "${data2}" "${data_clean}" "${data}.old" "${data2}.old" "${data_clean}.old" +} + +test_dropped_samples() { + echo "Test dropped samples (phys-data)" + local data + data=$(mktemp /tmp/perf.data.dropped.XXXXXX) + local data2 + data2=$(mktemp /tmp/perf.data2.dropped.XXXXXX) + + # Check if --phys-data is supported by recording a short run + if ! perf record -e task-clock:u --phys-data -o "${data}" -- sleep 0.1 > /dev/null 2>&1; then + echo "Skipping dropped samples test as --phys-data is not supported" + return + fi + + perf record -e task-clock:u --phys-data -o "${data}" ${prog} + perf inject --aslr -i "${data}" -o "${data2}" + + # Verify that samples are dropped. + samples_count=$(perf script -i "${data2}" | wc -l) + + if [ "$samples_count" -gt 0 ]; then + echo "Dropped samples test [Failed - samples were not dropped]" + err=1 + else + echo "Dropped samples test [Success]" + rm -f "${data}" "${data2}" "${data}.old" "${data2}.old" + fi +} + +test_kernel_aslr() { + echo "Test kernel ASLR remapping" + local kdata + kdata=$(mktemp /tmp/perf.data.kernel.XXXXXX) + local kdata2 + kdata2=$(mktemp /tmp/perf.data2.kernel.XXXXXX) + local log_file + log_file=$(mktemp /tmp/kernel_record.log.XXXXXX) + + # Try to record kernel samples + if ! perf record -e task-clock:k -o "${kdata}" ${prog} > "${log_file}" 2>&1; then + echo "Skipping kernel ASLR test as recording failed (maybe no permissions)" + rm -f "${kdata}" "${log_file}" + return + fi + + # Check for warning about kernel map restriction + if grep -q "Couldn't record kernel reference relocation symbol" "${log_file}"; then + echo "Skipping kernel ASLR test as kernel map could not be recorded (permissions restricted)" + rm -f "${kdata}" "${log_file}" + return + fi + + perf inject -v --aslr -i "${kdata}" -o "${kdata2}" + + # Check if kernel addresses are remapped. + orig_addr=$(perf script -i "${kdata}" | \ + awk '{for(i=1;i<=NF;i++) if($i ~ /^ffff/) {print $i; exit}}') + new_addr=$(perf script -i "${kdata2}" | \ + awk '{for(i=1;i<=NF;i++) if($i ~ /^ffff/) {print $i; exit}}') + + echo "Kernel ASLR: orig_addr=$orig_addr, new_addr=$new_addr" + + if [ -z "$orig_addr" ]; then + echo "Kernel ASLR test [Failed - no kernel samples in original file]" + err=1 + elif [ -z "$new_addr" ]; then + echo "Kernel ASLR test [Failed - could not find remapped address]" + err=1 + elif [ "$orig_addr" = "$new_addr" ]; then + echo "Kernel ASLR test [Failed - addresses are not remapped]" + err=1 + else + echo "Kernel ASLR test [Success]" + rm -f "${kdata}" "${kdata2}" "${log_file}" "${kdata}.old" "${kdata2}.old" + fi +} + +test_kernel_report_aslr() { + echo "Test kernel perf report consistency" + local kdata + kdata=$(mktemp /tmp/perf.data.kernel_report.XXXXXX) + local kdata2 + kdata2=$(mktemp /tmp/perf.data2.kernel_report.XXXXXX) + local data_clean + data_clean=$(mktemp /tmp/perf.data.clean.XXXXXX) + local log_file + log_file=$(mktemp /tmp/kernel_report_record.log.XXXXXX) + + # Try to record kernel samples + if ! perf record -e task-clock:k -o "${kdata}" ${prog} > "${log_file}" 2>&1; then + echo "Skipping kernel report test as recording failed (maybe no permissions)" + rm -f "${kdata}" "${log_file}" + return + fi + + # Check for warning about kernel map restriction + if grep -q "Couldn't record kernel reference relocation symbol" "${log_file}"; then + echo "Skipping kernel report test as kernel map could not be recorded (permissions restricted)" + rm -f "${kdata}" "${log_file}" + return + fi + + # Use -b to inject build-ids and force ordered events processing in both + perf inject -b -i "${kdata}" -o "${data_clean}" + perf inject -v -b --aslr -i "${kdata}" -o "${kdata2}" + + local report1="${temp_dir}/report_kernel1" + local report2="${temp_dir}/report_kernel2" + local report1_clean="${temp_dir}/report_kernel1.clean" + local report2_clean="${temp_dir}/report_kernel2.clean" + + perf report -i "${data_clean}" --stdio > "${report1}" + perf report -i "${kdata2}" --stdio > "${report2}" + + # Strip headers and compare lines with percentages + grep '%' "${report1}" | grep -v '^#' > "${report1_clean}" + grep '%' "${report2}" | grep -v '^#' > "${report2_clean}" + + # Normalize kernel DSOs and addresses in clean reports + # This allows kernel modules to be either a module or kernel.kallsyms + local report1_norm="${temp_dir}/report_kernel1.norm" + local report2_norm="${temp_dir}/report_kernel2.norm" + + awk '{gsub(/\[[a-zA-Z0-9_.-]{2,}\](\.[a-zA-Z0-9_]+)?/, "[kernel]", $0); \ + gsub(/0x[0-9a-f]+/, "[addr]", $0); \ + gsub(/ffff[0-9a-f]+/, "[addr]", $0); \ + gsub(/0000000000000000/, "[addr]", $0); \ + print}' "${report1_clean}" > "${report1_norm}" + awk '{gsub(/\[[a-zA-Z0-9_.-]{2,}\](\.[a-zA-Z0-9_]+)?/, "[kernel]", $0); \ + gsub(/0x[0-9a-f]+/, "[addr]", $0); \ + gsub(/ffff[0-9a-f]+/, "[addr]", $0); \ + gsub(/0000000000000000/, "[addr]", $0); \ + print}' "${report2_clean}" > "${report2_norm}" + + # Calculate sum of percentages for [kernel] samples + sum1=$(awk '/\[kernel\]/ {sum += $1} END {print sum}' "${report1_norm}") + sum2=$(awk '/\[kernel\]/ {sum += $1} END {print sum}' "${report2_norm}") + + echo "Kernel report sums: sum1=$sum1, sum2=$sum2" + + # Compare sums with tolerance + if awk -v s1="$sum1" -v s2="$sum2" \ + 'BEGIN {diff = s1 - s2; if (diff < 0) diff = -diff; if (diff < 0.05) exit 0; else exit 1}'; then + echo "Kernel Report ASLR test [Success]" + else + echo "Kernel Report ASLR test [Failed - sums differ too much]" + err=1 + fi + + rm -f "${kdata}" "${kdata2}" "${data_clean}" "${log_file}" \ + "${kdata}.old" "${kdata2}.old" "${data_clean}.old" +} + +test_basic_aslr +test_pipe_aslr +test_callchain_aslr +test_report_aslr +test_pipe_report_aslr +test_dropped_samples +test_kernel_aslr +test_kernel_report_aslr + +cleanup +exit $err -- 2.54.0.545.g6539524ca2-goog