lwn.git/tools/testing/selftests/livepatch, branch master

Merge branch 'for-7.1/module-function-test' into for-linus

2026-04-16T08:33:43+00:00

selftests/livepatch: add test for module function patching

2026-03-30T13:37:31+00:00

Add a target module and livepatch pair that verify module function patching via a proc entry. Two test cases cover both the klp_enable_patch path (target loaded before livepatch) and the klp_module_coming path (livepatch loaded before target). Signed-off-by: Pablo Alessandro Santos Hugen Acked-by: Miroslav Benes Acked-by: Joe Lawrence Reviewed-by: Petr Mladek Tested-by: Petr Mladek Link: https://patch.msgid.link/20260320201135.1203992-1-phugen@redhat.com Signed-off-by: Petr Mladek

selftests: livepatch: test-ftrace: livepatch a traced function

2026-03-06T13:54:28+00:00

This is basically the inverse case of commit 474eecc882ae ("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 Reviewed-by: Petr Mladek Tested-by: Petr Mladek Acked-by: Miroslav Benes Acked-by: Joe Lawrence 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

selftests: livepatch: use canonical ftrace path

2025-10-15T12:50:46+00:00

Since v4.1 kernel, a new interface for ftrace called "tracefs" was introduced, which is usually mounted in /sys/kernel/tracing. Therefore, tracing files can now be accessed via either the legacy path /sys/kernel/debug/tracing or the newer path /sys/kernel/tracing. Signed-off-by: Fushuai Wang Reviewed-by: Petr Mladek Tested-by: Petr Mladek Signed-off-by: Petr Mladek

Merge tag 'livepatching-for-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching

2025-03-28T02:26:10+00:00

Pull livepatching updates from Petr Mladek: - Add a selftest for tracing of a livepatched function - Skip a selftest when kprobes are not using ftrace - Some documentation clean up * tag 'livepatching-for-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching: selftests: livepatch: test if ftrace can trace a livepatched function selftests: livepatch: add new ftrace helpers functions selftest/livepatch: Only run test-kprobe with CONFIG_KPROBES_ON_FTRACE docs: livepatch: move text out of code block livepatch: Add comment to clarify klp_add_nops()

Merge branch 'for-6.15/ftrace-test' into for-linus

2025-03-27T11:01:51+00:00

selftests: livepatch: test if ftrace can trace a livepatched function

2025-03-25T13:52:32+00:00

This new test makes sure that ftrace can trace a function that was introduced by a livepatch. Signed-off-by: Filipe Xavier Acked-by: Miroslav Benes Acked-by: Joe Lawrence Reviewed-by: Petr Mladek Tested-by: Petr Mladek Link: https://lore.kernel.org/r/20250324-ftrace-sftest-livepatch-v3-2-d9d7cc386c75@gmail.com Signed-off-by: Petr Mladek

selftests: livepatch: add new ftrace helpers functions

2025-03-25T13:46:02+00:00

Add new ftrace helpers functions cleanup_tracing, trace_function and check_traced_functions. Signed-off-by: Filipe Xavier Acked-by: Miroslav Benes Acked-by: Joe Lawrence Reviewed-by: Petr Mladek Tested-by: Petr Mladek Link: https://lore.kernel.org/r/20250324-ftrace-sftest-livepatch-v3-1-d9d7cc386c75@gmail.com Signed-off-by: Petr Mladek

selftest/livepatch: Only run test-kprobe with CONFIG_KPROBES_ON_FTRACE

2025-03-25T12:36:40+00:00

CONFIG_KPROBES_ON_FTRACE is required for test-kprobe. Skip test-kprobe when CONFIG_KPROBES_ON_FTRACE is not set. Since some kernel may not have /proc/config.gz, grep for kprobe_ftrace_ops from /proc/kallsyms to check whether CONFIG_KPROBES_ON_FTRACE is enabled. Signed-off-by: Song Liu Acked-by: Joe Lawrence Acked-by: Miroslav Benes Link: https://lore.kernel.org/r/20250318181518.1055532-1-song@kernel.org [pmladek@suse.com: Call grep with -q option.] Reviewed-by: Petr Mladek Tested-by: Petr Mladek Signed-off-by: Petr Mladek

selftests: livepatch: handle PRINTK_CALLER in check_result()

2025-01-27T10:41:28+00:00

Some arch configs (like ppc64) enable CONFIG_PRINTK_CALLER, which adds the caller id as part of the dmesg. With recent util-linux's update 467a5b3192f16 ('dmesg: add caller_id support') the standard "dmesg" has been enhanced to print PRINTK_CALLER fields. Due to this, even though the expected vs observed are same, end testcase results are failed. -% insmod test_modules/test_klp_livepatch.ko -livepatch: enabling patch 'test_klp_livepatch' -livepatch: 'test_klp_livepatch': initializing patching transition -livepatch: 'test_klp_livepatch': starting patching transition -livepatch: 'test_klp_livepatch': completing patching transition -livepatch: 'test_klp_livepatch': patching complete -% echo 0 > /sys/kernel/livepatch/test_klp_livepatch/enabled -livepatch: 'test_klp_livepatch': initializing unpatching transition -livepatch: 'test_klp_livepatch': starting unpatching transition -livepatch: 'test_klp_livepatch': completing unpatching transition -livepatch: 'test_klp_livepatch': unpatching complete -% rmmod test_klp_livepatch +[ T3659] % insmod test_modules/test_klp_livepatch.ko +[ T3682] livepatch: enabling patch 'test_klp_livepatch' +[ T3682] livepatch: 'test_klp_livepatch': initializing patching transition +[ T3682] livepatch: 'test_klp_livepatch': starting patching transition +[ T826] livepatch: 'test_klp_livepatch': completing patching transition +[ T826] livepatch: 'test_klp_livepatch': patching complete +[ T3659] % echo 0 > /sys/kernel/livepatch/test_klp_livepatch/enabled +[ T3659] livepatch: 'test_klp_livepatch': initializing unpatching transition +[ T3659] livepatch: 'test_klp_livepatch': starting unpatching transition +[ T789] livepatch: 'test_klp_livepatch': completing unpatching transition +[ T789] livepatch: 'test_klp_livepatch': unpatching complete +[ T3659] % rmmod test_klp_livepatch ERROR: livepatch kselftest(s) failed not ok 1 selftests: livepatch: test-livepatch.sh # exit=1 Currently the check_result() handles the "[time]" removal from the dmesg. Enhance the check to also handle removal of "[Thread Id]" or "[CPU Id]". Signed-off-by: Madhavan Srinivasan Acked-by: Miroslav Benes Reviewed-by: Petr Mladek Tested-by: Petr Mladek Link: https://lore.kernel.org/r/20250119163238.749847-1-maddy@linux.ibm.com Signed-off-by: Petr Mladek