On Tue, Apr 14, 2020 at 5:17 AM 'David Gow' via kasan-dev <kasan-dev@xxxxxxxxxxxxxxxx> wrote: > > From: Patricia Alfonso <trishalfonso@xxxxxxxxxx> > > Include documentation on how to test KASAN using CONFIG_TEST_KASAN and > CONFIG_TEST_KASAN_USER. This patch needs to be updated to use the new naming, TEST_KASAN_KUNIT and TEST_KASAN_MODULE. > > Signed-off-by: Patricia Alfonso <trishalfonso@xxxxxxxxxx> > Reviewed-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> > Signed-off-by: David Gow <davidgow@xxxxxxxxxx> > --- > Documentation/dev-tools/kasan.rst | 70 +++++++++++++++++++++++++++++++ > 1 file changed, 70 insertions(+) > > diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst > index c652d740735d..287ba063d9f6 100644 > --- a/Documentation/dev-tools/kasan.rst > +++ b/Documentation/dev-tools/kasan.rst > @@ -281,3 +281,73 @@ unmapped. This will require changes in arch-specific code. > > This allows ``VMAP_STACK`` support on x86, and can simplify support of > architectures that do not have a fixed module region. > + > +CONFIG_TEST_KASAN & CONFIG_TEST_KASAN_USER > +------------------------------------------- > + > +``CONFIG_TEST_KASAN`` utilizes the KUnit Test Framework for testing. > +This means each test focuses on a small unit of functionality and > +there are a few ways these tests can be run. > + > +Each test will print the KASAN report if an error is detected and then > +print the number of the test and the status of the test: > + > +pass:: > + > + ok 28 - kmalloc_double_kzfree > +or, if kmalloc failed:: > + > + # kmalloc_large_oob_right: ASSERTION FAILED at lib/test_kasan.c:163 > + Expected ptr is not null, but is > + not ok 4 - kmalloc_large_oob_right > +or, if a KASAN report was expected, but not found:: > + > + # kmalloc_double_kzfree: EXPECTATION FAILED at lib/test_kasan.c:629 > + Expected kasan_data->report_expected == kasan_data->report_found, but > + kasan_data->report_expected == 1 > + kasan_data->report_found == 0 > + not ok 28 - kmalloc_double_kzfree > + > +All test statuses are tracked as they run and an overall status will > +be printed at the end:: > + > + ok 1 - kasan_kunit_test > + > +or:: > + > + not ok 1 - kasan_kunit_test > + > +(1) Loadable Module > +~~~~~~~~~~~~~~~~~~~~ > + > +With ``CONFIG_KUNIT`` built-in, ``CONFIG_TEST_KASAN`` can be built as > +a loadable module and run on any architecture that supports KASAN > +using something like insmod or modprobe. > + > +(2) Built-In > +~~~~~~~~~~~~~ > + > +With ``CONFIG_KUNIT`` built-in, ``CONFIG_TEST_KASAN`` can be built-in > +on any architecure that supports KASAN. These and any other KUnit > +tests enabled will run and print the results at boot as a late-init > +call. > + > +(3) Using kunit_tool > +~~~~~~~~~~~~~~~~~~~~~ > + > +With ``CONFIG_KUNIT`` and ``CONFIG_TEST_KASAN`` built-in, we can also > +use kunit_tool to see the results of these along with other KUnit > +tests in a more readable way. This will not print the KASAN reports > +of tests that passed. Use `KUnit documentation <https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html>`_ for more up-to-date > +information on kunit_tool. > + > +.. _KUnit: https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html > + > +``CONFIG_TEST_KASAN_USER`` is a set of KASAN tests that could not be > +converted to KUnit. These tests can be run only as a module with > +``CONFIG_TEST_KASAN_USER`` built as a loadable module and > +``CONFIG_KASAN`` built-in. The type of error expected and the > +function being run is printed before the expression expected to give > +an error. Then the error is printed, if found, and that test > +should be interpretted to pass only if the error was the one expected > +by the test. > -- > 2.26.0.110.g2183baf09c-goog > > -- > You received this message because you are subscribed to the Google Groups "kasan-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an email to kasan-dev+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/kasan-dev/20200414031647.124664-5-davidgow%40google.com.
