1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (C) 2023 SUSE
4 # Author: Marcos Paulo de Souza <mpdesouza@suse.com>
5
6 . $(dirname $0)/functions.sh
7
8 MOD_SYSCALL=test_klp_syscall
9
10 setup_config
11
12 # - Start _NRPROC processes calling getpid and load a livepatch to patch the
13 # getpid syscall. Check if all the processes transitioned to the livepatched
14 # state.
15
16 start_test "patch getpid syscall while being heavily hammered"
17
18 NPROC=$(getconf _NPROCESSORS_ONLN)
19 MAXPROC=128
20
21 for i in $(seq 1 $(($NPROC < $MAXPROC ? $NPROC : $MAXPROC))); do
22 ./test_klp-call_getpid &
23 pids[$i]="$!"
24 done
25
26 pid_list=$(echo ${pids[@]} | tr ' ' ',')
27 load_lp $MOD_SYSCALL klp_pids=$pid_list
28
29 # wait for all tasks to transition to patched state
30 loop_until 'grep -q '^0$' /sys/kernel/test_klp_syscall/npids'
31
32 pending_pids=$(cat /sys/kernel/test_klp_syscall/npids)
33 log "$MOD_SYSCALL: Remaining not livepatched processes: $pending_pids"
34
35 for pid in ${pids[@]}; do
36 kill $pid || true
37 done
38
39 disable_lp $MOD_SYSCALL
40 unload_lp $MOD_SYSCALL
41
42 check_result "% insmod test_modules/$MOD_SYSCALL.ko klp_pids=$pid_list
43 livepatch: enabling patch '$MOD_SYSCALL'
44 livepatch: '$MOD_SYSCALL': initializing patching transition
45 livepatch: '$MOD_SYSCALL': starting patching transition
46 livepatch: '$MOD_SYSCALL': completing patching transition
47 livepatch: '$MOD_SYSCALL': patching complete
48 $MOD_SYSCALL: Remaining not livepatched processes: 0
49 % echo 0 > /sys/kernel/livepatch/$MOD_SYSCALL/enabled
50 livepatch: '$MOD_SYSCALL': initializing unpatching transition
51 livepatch: '$MOD_SYSCALL': starting unpatching transition
52 livepatch: '$MOD_SYSCALL': completing unpatching transition
53 livepatch: '$MOD_SYSCALL': unpatching complete
54 % rmmod $MOD_SYSCALL"
55
56 exit 0
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