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46edf5d7ae
Define a maximum allowable number of pids that can be livepatched in test-syscall.sh as with extremely large machines the output from a large number of processes overflows the dev/kmsg "expect" buffer in the "check_result" function and causes a false error. Reported-by: CKI Project <cki-project@redhat.com> Signed-off-by: Ryan Sullivan <rysulliv@redhat.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Tested-by: Marcos Paulo de Souza <mpdesouza@suse.com> Reviewed-by: Marcos Paulo de Souza <mpdesouza@suse.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Acked-by: Joel Savitz <jsavitz@redhat.com> Link: https://lore.kernel.org/r/20240606135348.4708-1-rysulliv@redhat.com Signed-off-by: Petr Mladek <pmladek@suse.com>
57 lines
1.7 KiB
Bash
Executable File
57 lines
1.7 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2023 SUSE
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# Author: Marcos Paulo de Souza <mpdesouza@suse.com>
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. $(dirname $0)/functions.sh
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MOD_SYSCALL=test_klp_syscall
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setup_config
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# - Start _NRPROC processes calling getpid and load a livepatch to patch the
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# getpid syscall. Check if all the processes transitioned to the livepatched
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# state.
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start_test "patch getpid syscall while being heavily hammered"
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NPROC=$(getconf _NPROCESSORS_ONLN)
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MAXPROC=128
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for i in $(seq 1 $(($NPROC < $MAXPROC ? $NPROC : $MAXPROC))); do
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./test_klp-call_getpid &
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pids[$i]="$!"
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done
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pid_list=$(echo ${pids[@]} | tr ' ' ',')
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load_lp $MOD_SYSCALL klp_pids=$pid_list
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# wait for all tasks to transition to patched state
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loop_until 'grep -q '^0$' /sys/kernel/test_klp_syscall/npids'
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pending_pids=$(cat /sys/kernel/test_klp_syscall/npids)
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log "$MOD_SYSCALL: Remaining not livepatched processes: $pending_pids"
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for pid in ${pids[@]}; do
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kill $pid || true
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done
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disable_lp $MOD_SYSCALL
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unload_lp $MOD_SYSCALL
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check_result "% insmod test_modules/$MOD_SYSCALL.ko klp_pids=$pid_list
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livepatch: enabling patch '$MOD_SYSCALL'
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livepatch: '$MOD_SYSCALL': initializing patching transition
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livepatch: '$MOD_SYSCALL': starting patching transition
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livepatch: '$MOD_SYSCALL': completing patching transition
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livepatch: '$MOD_SYSCALL': patching complete
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$MOD_SYSCALL: Remaining not livepatched processes: 0
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% echo 0 > /sys/kernel/livepatch/$MOD_SYSCALL/enabled
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livepatch: '$MOD_SYSCALL': initializing unpatching transition
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livepatch: '$MOD_SYSCALL': starting unpatching transition
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livepatch: '$MOD_SYSCALL': completing unpatching transition
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livepatch: '$MOD_SYSCALL': unpatching complete
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% rmmod $MOD_SYSCALL"
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exit 0
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