052f395164
On some machines with a large number of CPUs there is a sizable delay between an atomic replace occurring and when sysfs updates accordingly. This fix uses 'loop_until' to wait for the atomic replace to unload all previous livepatches. Reported-by: CKI Project <cki-project@redhat.com> Closes: https://datawarehouse.cki-project.org/kcidb/tests/redhat:1413102084-x86_64-kernel_upt_28 Signed-off-by: Ryan Sullivan <rysulliv@redhat.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Acked-by: Joe Lawrence <joe.lawrence@redhat.com> Link: https://lore.kernel.org/r/20240822173122.14760-1-rysulliv@redhat.com Signed-off-by: Petr Mladek <pmladek@suse.com> |
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|---|---|---|
| .. | ||
| test_modules | ||
| .gitignore | ||
| config | ||
| functions.sh | ||
| Makefile | ||
| README | ||
| settings | ||
| test_klp-call_getpid.c | ||
| test-callbacks.sh | ||
| test-ftrace.sh | ||
| test-livepatch.sh | ||
| test-shadow-vars.sh | ||
| test-state.sh | ||
| test-syscall.sh | ||
| test-sysfs.sh | ||
==================== Livepatch Self Tests
This is a small set of sanity tests for the kernel livepatching.
The test suite loads and unloads several test kernel modules to verify livepatch behavior. Debug information is logged to the kernel's message buffer and parsed for expected messages. (Note: the tests will compare the message buffer for only the duration of each individual test.)
Config
Set CONFIG_LIVEPATCH=y option and it's prerequisites.
Building the tests
To only build the tests without running them, run:
% make -C tools/testing/selftests/livepatch
The command above will compile all test modules and test programs, making them ready to be packaged if so desired.
Running the tests
Test kernel modules are built before running the livepatch selftests. The modules are located under test_modules directory, and are built as out-of-tree modules. This is specially useful since the same sources can be built and tested on systems with different kABI, ensuring they the tests are backwards compatible. The modules will be loaded by the test scripts using insmod.
To run the livepatch selftests, from the top of the kernel source tree:
% make -C tools/testing/selftests TARGETS=livepatch run_tests
or
% make kselftest TARGETS=livepatch
Adding tests
See the common functions.sh file for the existing collection of utility functions, most importantly setup_config(), start_test() and check_result(). The latter function greps the kernel's ring buffer for "livepatch:" and "test_klp" strings, so tests be sure to include one of those strings for result comparison. Other utility functions include general module loading and livepatch loading helpers (waiting for patch transitions, sysfs entries, etc.)