Changes in Makefile

57000fe6a60421b35ce51a338cc33caf057f5795 - selftests/livepatch: add test for module function patching

Fri, 20 Mar 2026 21:11:17 +0100

selftests/livepatch: add test for module function patchingAdd a target module and livepatch pair that verify module functionpatching via a proc entry. Two test cases cover both theklp_enable_patch path (target loaded before livepatch) and theklp_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.comSigned-off-by: Petr Mladek List of files: /linux/tools/testing/selftests/livepatch/test_modules/Makefile

62597edf6340191511bdf9a7f64fa315ddc58805 - selftests: livepatch: test livepatching a kprobed function

Thu, 17 Oct 2024 22:01:32 +0200

selftests: livepatch: test livepatching a kprobed functionThe test proves that a function that is being kprobed and uses apost_handler cannot be livepatched.Only one ftrace_ops with FTRACE_OPS_FL_IPMODIFY set may be registeredto any given function at a time.Note that the conflicting kprobe could not be created using thetracefs 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 apost_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.comSigned-off-by: Petr Mladek List of files: /linux/tools/testing/selftests/livepatch/test_modules/Makefile

54ee3526796f56c249124686a33e1cc05f76ea21 - selftests: livepatch: Avoid running the tests if kernel-devel is missing

Wed, 21 Feb 2024 18:17:04 +0100

selftests: livepatch: Avoid running the tests if kernel-devel is missingBy checking if KDIR is a valid directory we can safely skip the tests ifkernel-devel isn't installed (default value of KDIR), or if KDIRvariable passed doesn't exists.Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202402191417.XULH88Ct-lkp@intel.com/Signed-off-by: Marcos Paulo de Souza Signed-off-by: Shuah Khan List of files: /linux/tools/testing/selftests/livepatch/test_modules/Makefile

6a71770442b5b7cf8f880ca1c0a72456c918c757 - selftests: livepatch: Test livepatching a heavily called syscall

Fri, 12 Jan 2024 18:43:52 +0100

selftests: livepatch: Test livepatching a heavily called syscallThe test proves that a syscall can be livepatched. It is interestingbecause syscalls are called a tricky way. Also the process getslivepatched either when sleeping in the userspace or when enteringor leaving the kernel space.The livepatch is a bit tricky: 1. The syscall function name is architecture specific. Also ARCH_HAS_SYSCALL_WRAPPER must be taken in account. 2. The syscall must stay working the same way for other processes on the system. It is solved by decrementing a counter only for PIDs of the test processes. It means that the test processes has to call the livepatched syscall at least once.The test creates one userspace process per online cpu. The processesare calling getpid in a busy loop. The intention is to create randomlocations when the livepatch gets enabled. Nothing is guarantted.The magic is in the randomness.Reviewed-by: Joe Lawrence Reviewed-by: Petr Mladek Signed-off-by: Marcos Paulo de Souza Signed-off-by: Shuah Khan List of files: /linux/tools/testing/selftests/livepatch/test_modules/Makefile

c4bbe83d27c2446a033cc0381c3fb6be5e8c41c7 - livepatch: Move tests from lib/livepatch to selftests/livepatch

Fri, 12 Jan 2024 18:43:51 +0100

livepatch: Move tests from lib/livepatch to selftests/livepatchThe modules are being moved from lib/livepatch totools/testing/selftests/livepatch/test_modules.This code moving will allow writing more complex tests, like for example anuserspace C code that will call a livepatched kernel function.The modules are now built as out-of-treemodules, but being part of the kernel source means they will be maintained.Another advantage of the code moving is to be able to easily change,debug and rebuild the tests by running make on the selftests/livepatchdirectory, which is not currently possible since the modules onlib/livepatch are build and installed using the "modules" target.The current approach also keeps the ability to execute the tests manuallyby executing the scripts inside selftests/livepatch directory, as it'scurrently supported. If the modules are modified, they needed to berebuilt before running the scripts though.The modules are built before running the selftests when using thekselftest invocations: make kselftest TARGETS=livepatchor make -C tools/testing/selftests/livepatch run_testsHaving the modules being built as out-of-modules requires changing thecurrently used 'modprobe' by 'insmod' and adapt the test scripts thatcheck for the kernel message buffer.Now it is possible to only compile the modules by running: make -C tools/testing/selftests/livepatch/This way the test modules and other test program can be built in orderto be packaged if so desired.As there aren't any modules being built on lib/livepatch, remove theTEST_LIVEPATCH Kconfig and it's references.Note: "make gen_tar" packages the pre-built binaries into the tarball. It means that it will store the test modules pre-built for the kernel running on the build host. Note that these modules need not binary compatible with the kernel built from the same sources. But the same is true for other packaged selftest binaries. The entire kernel sources are needed for rebuilding the selftests on another system.Reviewed-by: Joe Lawrence Reviewed-by: Petr Mladek Signed-off-by: Marcos Paulo de Souza Acked-by: Alexander Gordeev Signed-off-by: Shuah Khan List of files: /linux/tools/testing/selftests/livepatch/test_modules/Makefile