linux/tools/testing/selftests/livepatch
Joe Lawrence c401088f0f selftests/livepatch: refine dmesg 'taints' in dmesg comparison
The livepatch selftests currently grep on "taints" to filter out
"tainting kernel with TAINT_LIVEPATCH" messages which may be logged when
loading livepatch modules.

Further filter the log to drop "loading out-of-tree module taints
kernel" in the rare case the klp_test modules have been built
out-of-tree.

Look for the longer "taints kernel" or "tainting kernel" strings to
avoid inadvertent partial matching.

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Reviewed-by: Yannick Cote <ycote@redhat.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20200618181040.21132-3-joe.lawrence@redhat.com
2020-06-19 10:47:04 +02:00
..
config selftests: livepatch: add missing fragments to config 2019-09-23 08:33:16 -06:00
functions.sh selftests/livepatch: refine dmesg 'taints' in dmesg comparison 2020-06-19 10:47:04 +02:00
Makefile selftests: Install settings files to fix TIMEOUT failures 2020-02-20 08:56:42 -07:00
README selftests/livepatch: Don't clear dmesg when running tests 2020-06-19 10:46:42 +02:00
settings selftests/livepatch: Disable the timeout 2019-10-25 19:59:12 +02:00
test-callbacks.sh selftests/livepatch: Don't clear dmesg when running tests 2020-06-19 10:46:42 +02:00
test-ftrace.sh selftests/livepatch: Don't clear dmesg when running tests 2020-06-19 10:46:42 +02:00
test-livepatch.sh selftests/livepatch: Don't clear dmesg when running tests 2020-06-19 10:46:42 +02:00
test-shadow-vars.sh selftests/livepatch: Don't clear dmesg when running tests 2020-06-19 10:46:42 +02:00
test-state.sh selftests/livepatch: Don't clear dmesg when running tests 2020-06-19 10:46:42 +02:00

====================
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 these config options and their prerequisites:

CONFIG_LIVEPATCH=y
CONFIG_TEST_LIVEPATCH=m


Running the tests
-----------------

Test kernel modules are built as part of lib/ (make modules) and need to
be installed (make modules_install) as the test scripts will modprobe
them.

To run the livepatch selftests, from the top of the kernel source tree:

  % make -C tools/testing/selftests TARGETS=livepatch run_tests


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.)