linux.git/tools/testing/selftests/livepatch, branch v7.2-rc1

selftests/livepatch: fix resource leak in test_klp_syscall init error path

2026-06-09T10:38:33+00:00

In livepatch_init(), if klp_enable_patch() fails, the previously
created kobject and sysfs file are never cleaned up, causing a
resource leak. Capture the return value and add proper cleanup
on the error path.

Signed-off-by: Rui Qi 
Acked-by: Miroslav Benes 
Reviewed-by: Petr Mladek 
Link: https://patch.msgid.link/20260604083208.1071428-1-qirui.001@bytedance.com
Signed-off-by: Petr Mladek

selftests: livepatch: set LC_ALL=C to fix locale-dependent test failure

2026-06-03T12:59:29+00:00

When executing the command
"make -C tools/testing/selftests TARGETS=livepatch run_tests",
the following error message was reported.

TEST: livepatch interaction with ftrace_enabled sysctl ... not ok
...
livepatch: sysctlo
: setting key "kernel.ftrace_enabled": Device or resource busy
livepatch: sysctl: setting key "kernel.ftrace_enabled": 设备或资源忙
...
ERROR: livepatch kselftest(s) failed
not ok 5 selftests: livepatch: test-ftrace.sh # exit=1

To fix it, set LC_ALL=C.

Signed-off-by: Qiang Ma 
Acked-by: Miroslav Benes 
Acked-by: Petr Mladek 
Link: https://patch.msgid.link/20260527095929.1504032-1-maqianga@uniontech.com
Signed-off-by: Petr Mladek

selftests: livepatch: Check if stack_order sysfs attribute exists

2026-05-06T12:09:33+00:00

The commit 3dae09de4061 ("livepatch: Add stack_order sysfs attribute"),
merged in v6.14, introduced a new sysfs attribute.

In order to run the selftests on older kernels, check if given kernel
has support for the attribute. If the attribute is not supported, skip
the checks.

Signed-off-by: Marcos Paulo de Souza 
Reviewed-by: Petr Mladek 
Acked-by: Joe Lawrence 
Link: https://patch.msgid.link/20260504-lp-tests-old-fixes-v5-6-0be26d94ab9a@suse.com
Signed-off-by: Petr Mladek

selftests: livepatch: Check if replace sysfs attribute exists

2026-05-06T12:09:33+00:00

The commit adb68ed26a3e ("livepatch: Add "replace" sysfs attribute"),
merged in v6.11, introduced a new sysfs attribute.

In order to run the selftests on older kernels, check if given kernel
has support for the attribute. If the attribute is not supported, skip
the checks.

While at it, create a local variable to hold the module name to be
tested, instead of overwriting MOD_LIVEPATCH.

Signed-off-by: Marcos Paulo de Souza 
Reviewed-by: Petr Mladek 
Acked-by: Joe Lawrence 
Link: https://patch.msgid.link/20260504-lp-tests-old-fixes-v5-5-0be26d94ab9a@suse.com
Signed-off-by: Petr Mladek

selftests: livepatch: Check if patched sysfs attribute exists

2026-05-06T12:09:33+00:00

The commit bb26cfd9e77e
("livepatch: add sysfs entry "patched" for each klp_object") was merged
in v6.1, introducing a new sysfs attribute.

In order to run the selftests on older kernels, check if given kernel
has support for the attribute. If the attribute is not supported, skip
the checks.

Along with this change, use MOD_LIVEPATCH2 variable instead of
reassigning a new value to MOD_LIVEPATCH, and also use the variable
names in the check_result, to avoid using the module names.

Signed-off-by: Marcos Paulo de Souza 
Reviewed-by: Petr Mladek 
Acked-by: Joe Lawrence 
Link: https://patch.msgid.link/20260504-lp-tests-old-fixes-v5-4-0be26d94ab9a@suse.com
Signed-off-by: Petr Mladek

selftests: livepatch: Introduce does_sysfs_exist function

2026-05-06T12:09:33+00:00

Returns true if the livepatch sysfs attribute exists, and false otherwise.
This new function will be used in the next patches.

Signed-off-by: Marcos Paulo de Souza 
Reviewed-by: Petr Mladek 
Acked-by: Joe Lawrence 
Link: https://patch.msgid.link/20260504-lp-tests-old-fixes-v5-3-0be26d94ab9a@suse.com
Signed-off-by: Petr Mladek

selftests: livepatch: Replace true/false module parameter by y/n

2026-05-06T12:09:33+00:00

Older kernels don't support true/false for boolean module parameters
because they lack commit 0d6ea3ac94ca
("lib/kstrtox.c: add "false"/"true" support to kstrtobool()"). Replace
true/false by y/n so the test module can be loaded on older kernels.

No functional changes.

Signed-off-by: Marcos Paulo de Souza 
Reviewed-by: Petr Mladek 
Acked-by: Joe Lawrence 
Link: https://patch.msgid.link/20260504-lp-tests-old-fixes-v5-2-0be26d94ab9a@suse.com
Signed-off-by: Petr Mladek

selftests: livepatch: Check for ARCH_HAS_SYSCALL_WRAPPER config

2026-05-06T12:09:33+00:00

Older kernels that lack CONFIG_ARCH_HAS_SYSCALL_WRAPPER config don't
have any prefixes for their syscalls. The same applies to current
powerpc and loongarch, covering all currently supported architectures
that support livepatch.

The other supported architectures have specific prefixes, so error out
when a new architecture adds livepatch support with wrappers but didn't
update the test to include it.

Signed-off-by: Marcos Paulo de Souza 
Reviewed-by: Petr Mladek 
Acked-by: Joe Lawrence 
Link: https://patch.msgid.link/20260504-lp-tests-old-fixes-v5-1-0be26d94ab9a@suse.com
Signed-off-by: Petr Mladek

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