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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-25 21:54:06 +08:00
linux-next/tools/testing/selftests/livepatch
Joe Lawrence 8c666d2ab5 selftests/livepatch: Test interaction with ftrace_enabled
Since livepatching depends upon ftrace handlers to implement "patched"
code functionality, verify that the ftrace_enabled sysctl value
interacts with livepatch registration as expected.  At the same time,
ensure that ftrace_enabled is set and part of the test environment
configuration that is saved and restored when running the selftests.

Link: http://lkml.kernel.org/r/20191016113316.13415-4-mbenes@suse.cz

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2019-11-04 09:33:16 -05:00
..
config selftests: livepatch: add missing fragments to config 2019-09-23 08:33:16 -06:00
functions.sh selftests/livepatch: Test interaction with ftrace_enabled 2019-11-04 09:33:16 -05:00
Makefile selftests/livepatch: Test interaction with ftrace_enabled 2019-11-04 09:33:16 -05:00
README selftests/livepatch: introduce tests 2019-01-11 20:51:24 +01:00
test-callbacks.sh selftests/livepatch: Make dynamic debug setup and restore generic 2019-11-04 09:33:15 -05:00
test-ftrace.sh selftests/livepatch: Test interaction with ftrace_enabled 2019-11-04 09:33:16 -05:00
test-livepatch.sh selftests/livepatch: Make dynamic debug setup and restore generic 2019-11-04 09:33:15 -05:00
test-shadow-vars.sh selftests/livepatch: Make dynamic debug setup and restore generic 2019-11-04 09:33:15 -05:00

====================
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 clear
the message buffer between individual tests.)


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 set_dynamic_debug() 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.)