Humble ping :)
On Tue, Oct 31, 2023 at 06:10:50PM -0300, Marcos Paulo de Souza wrote:
This patchset moves the current kernel testing livepatch modules from lib/livepatches to tools/testing/selftest/livepatch/test_modules, and compiles them as out-of-tree modules before testing.
There is also a new test being added. This new test exercises multiple processes calling a syscall, while a livepatch patched the syscall.
Why this move is an improvement:
- The modules are now compiled as out-of-tree modules against the current running kernel, making them capable of being tested on different systems with newer or older kernels.
- Such approach now needs kernel-devel package to be installed, since they are out-of-tree modules. These can be generated by running "make rpm-pkg" in the kernel source.
What needs to be solved:
Currently gen_tar only packages the resulting binaries of the tests, and not the sources. For the current approach, the newly added modules would be compiled and then packaged. It works when testing on a system with the same kernel version. But it will fail when running on a machine with different kernel version, since module was compiled against the kernel currently running.
This is not a new problem, just aligning the expectations. For the current approach to be truly system agnostic gen_tar would need to include the module and program sources to be compiled in the target systems.
I'm sending the patches now so it can be discussed before Plumbers.
Thanks in advance! Marcos
To: Shuah Khan shuah@kernel.org To: Jonathan Corbet corbet@lwn.net To: Heiko Carstens hca@linux.ibm.com To: Vasily Gorbik gor@linux.ibm.com To: Alexander Gordeev agordeev@linux.ibm.com To: Christian Borntraeger borntraeger@linux.ibm.com To: Sven Schnelle svens@linux.ibm.com To: Josh Poimboeuf jpoimboe@kernel.org To: Jiri Kosina jikos@kernel.org To: Miroslav Benes mbenes@suse.cz To: Petr Mladek pmladek@suse.com To: Joe Lawrence joe.lawrence@redhat.com Cc: linux-kselftest@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: live-patching@vger.kernel.org Signed-off-by: Marcos Paulo de Souza mpdesouza@suse.com
Changes in v3:
- Rebased on top of v6.6-rc5
- The commits messages were improved (Thanks Petr!)
- Created TEST_GEN_MODS_DIR variable to point to a directly that contains kernel modules, and adapt selftests to build it before running the test.
- Moved test_klp-call_getpid out of test_programs, since the gen_tar would just copy the generated test programs to the livepatches dir, and so scripts relying on test_programs/test_klp-call_getpid will fail.
- Added a module_param for klp_pids, describing it's usage.
- Simplified the call_getpid program to ignore the return of getpid syscall, since we only want to make sure the process transitions correctly to the patched stated
- The test-syscall.sh not prints a log message showing the number of remaining processes to transition into to livepatched state, and check_output expects it to be 0.
- Added MODULE_AUTHOR and MODULE_DESCRIPTION to test_klp_syscall.c
The v2 can be seen here: https://lore.kernel.org/linux-kselftest/20220630141226.2802-1-mpdesouza@suse...
Marcos Paulo de Souza (3): kselftests: lib.mk: Add TEST_GEN_MODS_DIR variable livepatch: Move tests from lib/livepatch to selftests/livepatch selftests: livepatch: Test livepatching a heavily called syscall
Documentation/dev-tools/kselftest.rst | 4 + arch/s390/configs/debug_defconfig | 1 - arch/s390/configs/defconfig | 1 - lib/Kconfig.debug | 22 ---- lib/Makefile | 2 - lib/livepatch/Makefile | 14 --- tools/testing/selftests/lib.mk | 20 +++- tools/testing/selftests/livepatch/Makefile | 5 +- tools/testing/selftests/livepatch/README | 17 +-- tools/testing/selftests/livepatch/config | 1 - tools/testing/selftests/livepatch/functions.sh | 34 +++--- .../testing/selftests/livepatch/test-callbacks.sh | 50 ++++----- tools/testing/selftests/livepatch/test-ftrace.sh | 6 +- .../testing/selftests/livepatch/test-livepatch.sh | 10 +- .../selftests/livepatch/test-shadow-vars.sh | 2 +- tools/testing/selftests/livepatch/test-state.sh | 18 ++-- tools/testing/selftests/livepatch/test-syscall.sh | 53 ++++++++++ tools/testing/selftests/livepatch/test-sysfs.sh | 6 +- .../selftests/livepatch/test_klp-call_getpid.c | 44 ++++++++ .../selftests/livepatch/test_modules/Makefile | 20 ++++ .../test_modules}/test_klp_atomic_replace.c | 0 .../test_modules}/test_klp_callbacks_busy.c | 0 .../test_modules}/test_klp_callbacks_demo.c | 0 .../test_modules}/test_klp_callbacks_demo2.c | 0 .../test_modules}/test_klp_callbacks_mod.c | 0 .../livepatch/test_modules}/test_klp_livepatch.c | 0 .../livepatch/test_modules}/test_klp_shadow_vars.c | 0 .../livepatch/test_modules}/test_klp_state.c | 0 .../livepatch/test_modules}/test_klp_state2.c | 0 .../livepatch/test_modules}/test_klp_state3.c | 0 .../livepatch/test_modules/test_klp_syscall.c | 116 +++++++++++++++++++++ 31 files changed, 325 insertions(+), 121 deletions(-)
base-commit: 6489bf2e1df1c84e9bcd4694029ff35b39fd3397 change-id: 20231031-send-lp-kselftests-4c917dcd4565
Best regards,
Marcos Paulo de Souza mpdesouza@suse.com