#!/bin/bash# perf trace enum augmentation tests# SPDX-License-Identifier: GPL-2.0 err=0 syscall="landlock_add_rule"non_syscall="timer:hrtimer_start" TESTPROG="perf test -w landlock" # shellcheck source=lib/probe.sh. "$(dirname $0)"/lib/probe.shskip_if_no_perf_trace || exit 2[ "$(id -u)" = 0 ] || exit 2 check_vmlinux() {  echo "Checking if vmlinux exists"  if [ ! -f /sys/kernel/btf/vmlinux ]  then    echo "trace+enum test [Skipped missing vmlinux BTF support]"    err=2  fi} check_permissions() {  if perf trace -e $syscall $TESTPROG 2>&1 | grep -q "Operation not permitted"  then    echo "trace+enum test [Skipped permissions]"    err=2  fi} trace_landlock() {  echo "Tracing syscall ${syscall}"   # test flight just to see if landlock_add_rule is available  if ! perf trace $TESTPROG 2>&1 | grep -q landlock  then    echo "No landlock system call found, skipping to non-syscall tracing."    return  fi   output="$(perf trace -e $syscall $TESTPROG 2>&1)"  if echo "$output" | grep -q -E ".*landlock_add_rule\(ruleset_fd: 11, rule_type: (LANDLOCK_RULE_PATH_BENEATH|LANDLOCK_RULE_NET_PORT), rule_attr: 0x[a-f0-9]+, flags: 45\) = -1.*"  then    err=0  else	printf "[syscall failure] Failed to trace syscall $syscall, output:\n$output\n"    err=1  fi} trace_non_syscall() {  echo "Tracing non-syscall tracepoint ${non_syscall}"  output="$(perf trace -e $non_syscall --max-events=1 2>&1)"  if echo "$output" | grep -q -E '.*timer:hrtimer_.*\(.*mode: HRTIMER_MODE_.*\)$'  then    err=0  else	printf "[tracepoint failure] Failed to trace tracepoint $non_syscall, output:\n$output\n"    err=1  fi} check_vmlinuxif [ $err = 0 ]; then  check_permissionsfi if [ $err = 0 ]; then  trace_landlockfi if [ $err = 0 ]; then  trace_non_syscallfi exit $err