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920e5001f4
This is basically the inverse case of commit 474eecc882
("selftests: livepatch: test if ftrace can trace a livepatched function")
but ensuring that livepatch would work on a traced function.
Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Link: https://patch.msgid.link/20260220-lp-test-trace-v1-1-4b6703cd01a6@suse.com
[pmladek: Fixed a typo found by Joe.]
Signed-off-by: Petr Mladek <pmladek@suse.com>
135 lines
4.6 KiB
Bash
Executable File
135 lines
4.6 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2019 Joe Lawrence <joe.lawrence@redhat.com>
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. $(dirname $0)/functions.sh
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MOD_LIVEPATCH=test_klp_livepatch
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setup_config
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# - turn ftrace_enabled OFF and verify livepatches can't load
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# - turn ftrace_enabled ON and verify livepatch can load
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# - verify that ftrace_enabled can't be turned OFF while a livepatch is loaded
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start_test "livepatch interaction with ftrace_enabled sysctl"
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set_ftrace_enabled 0
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load_failing_mod $MOD_LIVEPATCH
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set_ftrace_enabled 1
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load_lp $MOD_LIVEPATCH
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if [[ "$(cat /proc/cmdline)" != "$MOD_LIVEPATCH: this has been live patched" ]] ; then
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echo -e "FAIL\n\n"
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die "livepatch kselftest(s) failed"
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fi
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# Check that ftrace could not get disabled when a livepatch is enabled
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set_ftrace_enabled --fail 0
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if [[ "$(cat /proc/cmdline)" != "$MOD_LIVEPATCH: this has been live patched" ]] ; then
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echo -e "FAIL\n\n"
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die "livepatch kselftest(s) failed"
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fi
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disable_lp $MOD_LIVEPATCH
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unload_lp $MOD_LIVEPATCH
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check_result "livepatch: kernel.ftrace_enabled = 0
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% insmod test_modules/$MOD_LIVEPATCH.ko
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livepatch: enabling patch '$MOD_LIVEPATCH'
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livepatch: '$MOD_LIVEPATCH': initializing patching transition
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livepatch: failed to register ftrace handler for function 'cmdline_proc_show' (-16)
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livepatch: failed to patch object 'vmlinux'
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livepatch: failed to enable patch '$MOD_LIVEPATCH'
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livepatch: '$MOD_LIVEPATCH': canceling patching transition, going to unpatch
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livepatch: '$MOD_LIVEPATCH': completing unpatching transition
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livepatch: '$MOD_LIVEPATCH': unpatching complete
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insmod: ERROR: could not insert module test_modules/$MOD_LIVEPATCH.ko: Device or resource busy
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livepatch: kernel.ftrace_enabled = 1
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% insmod test_modules/$MOD_LIVEPATCH.ko
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livepatch: enabling patch '$MOD_LIVEPATCH'
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livepatch: '$MOD_LIVEPATCH': initializing patching transition
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livepatch: '$MOD_LIVEPATCH': starting patching transition
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livepatch: '$MOD_LIVEPATCH': completing patching transition
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livepatch: '$MOD_LIVEPATCH': patching complete
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livepatch: sysctl: setting key \"kernel.ftrace_enabled\": Device or resource busy
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% echo 0 > $SYSFS_KLP_DIR/$MOD_LIVEPATCH/enabled
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livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
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livepatch: '$MOD_LIVEPATCH': starting unpatching transition
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livepatch: '$MOD_LIVEPATCH': completing unpatching transition
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livepatch: '$MOD_LIVEPATCH': unpatching complete
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% rmmod $MOD_LIVEPATCH"
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# - verify livepatch can load
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# - check if traces have a patched function
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# - reset trace and unload livepatch
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start_test "trace livepatched function and check that the live patch remains in effect"
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FUNCTION_NAME="livepatch_cmdline_proc_show"
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load_lp $MOD_LIVEPATCH
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trace_function "$FUNCTION_NAME"
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if [[ "$(cat /proc/cmdline)" == "$MOD_LIVEPATCH: this has been live patched" ]] ; then
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log "livepatch: ok"
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fi
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check_traced_functions "$FUNCTION_NAME"
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disable_lp $MOD_LIVEPATCH
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unload_lp $MOD_LIVEPATCH
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check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
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livepatch: enabling patch '$MOD_LIVEPATCH'
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livepatch: '$MOD_LIVEPATCH': initializing patching transition
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livepatch: '$MOD_LIVEPATCH': starting patching transition
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livepatch: '$MOD_LIVEPATCH': completing patching transition
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livepatch: '$MOD_LIVEPATCH': patching complete
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livepatch: ok
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% echo 0 > $SYSFS_KLP_DIR/$MOD_LIVEPATCH/enabled
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livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
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livepatch: '$MOD_LIVEPATCH': starting unpatching transition
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livepatch: '$MOD_LIVEPATCH': completing unpatching transition
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livepatch: '$MOD_LIVEPATCH': unpatching complete
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% rmmod $MOD_LIVEPATCH"
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# - trace a function
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# - verify livepatch can load targgeting on the same traced function
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# - check if the livepatch is in effect
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# - reset trace and unload livepatch
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start_test "livepatch a traced function and check that the live patch remains in effect"
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FUNCTION_NAME="cmdline_proc_show"
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trace_function "$FUNCTION_NAME"
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load_lp $MOD_LIVEPATCH
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if [[ "$(cat /proc/cmdline)" == "$MOD_LIVEPATCH: this has been live patched" ]] ; then
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log "livepatch: ok"
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fi
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check_traced_functions "$FUNCTION_NAME"
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disable_lp $MOD_LIVEPATCH
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unload_lp $MOD_LIVEPATCH
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check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
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livepatch: enabling patch '$MOD_LIVEPATCH'
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livepatch: '$MOD_LIVEPATCH': initializing patching transition
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livepatch: '$MOD_LIVEPATCH': starting patching transition
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livepatch: '$MOD_LIVEPATCH': completing patching transition
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livepatch: '$MOD_LIVEPATCH': patching complete
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livepatch: ok
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% echo 0 > $SYSFS_KLP_DIR/$MOD_LIVEPATCH/enabled
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livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
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livepatch: '$MOD_LIVEPATCH': starting unpatching transition
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livepatch: '$MOD_LIVEPATCH': completing unpatching transition
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livepatch: '$MOD_LIVEPATCH': unpatching complete
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% rmmod $MOD_LIVEPATCH"
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exit 0
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