linux.git/tools/testing/selftests/livepatch, branch v6.18.21

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

Merge branch 'for-6.14/selftests-trivial' into for-linus

2025-01-20T13:25:01+00:00

selftests: livepatch: add test cases of stack_order sysfs interface

2024-12-09T10:47:21+00:00

Add selftest test cases to sysfs attribute 'stack_order'.

Suggested-by: Petr Mladek 
Signed-off-by: Wardenjohn 
Reviewed-by: Petr Mladek 
Tested-by: Petr Mladek 
Link: https://lore.kernel.org/r/20241024083530.58775-1-zhangwarden@gmail.com
[pmladek@suse.com: Substitute $SYSFS_KLP_DIR]
Signed-off-by: Petr Mladek

selftests/livepatch: Replace hardcoded module name with variable in test-callbacks.sh

2024-12-09T10:12:43+00:00

Replaced the hardcoded module name test_klp_callbacks_demo in the
pre_patch_callback log message with the variable $MOD_LIVEPATCH.

Signed-off-by: George Guo 
Reviewed-by: Petr Mladek 
Link: https://lore.kernel.org/r/20241125112812.281018-2-dongtai.guo@linux.dev
Signed-off-by: Petr Mladek

selftests: livepatch: test livepatching a kprobed function

2024-10-22T15:13:11+00:00

The test proves that a function that is being kprobed and uses a
post_handler cannot be livepatched.

Only one ftrace_ops with FTRACE_OPS_FL_IPMODIFY set may be registered
to any given function at a time.

Note that the conflicting kprobe could not be created using the
tracefs interface, see Documentation/trace/kprobetrace.rst.
This interface uses only the pre_handler(), see alloc_trace_kprobe().
But FTRACE_OPS_FL_IPMODIFY is used only when the kprobe is using a
post_handler, see arm_kprobe_ftrace().

Signed-off-by: Michael Vetter 
Reviewed-by: Miroslav Benes 
Reviewed-by: Joe Lawrence 
Tested-by: Marcos Paulo de Souza 
Reviewed-by: Marcos Paulo de Souza 
Reviewed-by: Petr Mladek 
Tested-by: Petr Mladek 
Link: https://lore.kernel.org/r/20241017200132.21946-4-mvetter@suse.com
Signed-off-by: Petr Mladek