From: Patricia Alfonso <trishalfonso@google.com>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: David Gow <davidgow@google.com>,
Brendan Higgins <brendanhiggins@google.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
LKML <linux-kernel@vger.kernel.org>,
kasan-dev <kasan-dev@googlegroups.com>,
kunit-dev@googlegroups.com,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>
Subject: Re: [RFC PATCH v2 3/3] KASAN: Port KASAN Tests to KUnit
Date: Tue, 24 Mar 2020 08:05:03 -0700 [thread overview]
Message-ID: <CAKFsvU+N=8=VmKVdNdf6os26z+vVD=vR=TL5GJtLQhR9FxOJUQ@mail.gmail.com> (raw)
In-Reply-To: <CACT4Y+YHPfP3LP04=Zc4NgyhH8FMJ9m-eU_VPjmk5SmGWo_fTg@mail.gmail.com>
On Tue, Mar 24, 2020 at 4:25 AM Dmitry Vyukov <dvyukov@google.com> wrote:
>
> On Thu, Mar 19, 2020 at 5:42 PM 'Patricia Alfonso' via kasan-dev
> <kasan-dev@googlegroups.com> wrote:
> >
> > Transfer all previous tests for KASAN to KUnit so they can be run
> > more easily. Using kunit_tool, developers can run these tests with their
> > other KUnit tests and see "pass" or "fail" with the appropriate KASAN
> > report instead of needing to parse each KASAN report to test KASAN
> > functionalities. All KASAN reports are still printed to dmesg.
> >
> > Stack tests do not work in UML so those tests are protected inside an
> > "#if IS_ENABLED(CONFIG_KASAN_STACK)" so this only runs if stack
> > instrumentation is enabled.
> >
> > copy_user_test cannot be run in KUnit so there is a separate test file
> > for those tests, which can be run as before as a module.
>
> Hi Patricia,
>
> FWIW I've got some conflicts applying this patch on latest linux-next
> next-20200324. There are some changes to the tests in mm tree I think.
>
> Which tree will this go through? I would be nice to resolve these
> conflicts somehow, but I am not sure how. Maybe the kasan tests
> changes are merged upstream next windows, and then rebase this?
>
> Also, how can I apply this for testing? I assume this is based on some
> kunit branch? which one?
>
Hmm... okay, that sounds like a problem. I will have to look into the
conflicts. I'm not sure which tree this will go through upstream; I
expect someone will tell me which is best when the time comes. This is
based on the kunit branch in the kunit documentation here:
https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/log/?h=kunit
> Why the copy_from_user tests can't be converted?
> It would be very nice to get rid of the modules entirely, rather than
> having 2 different test procedures because of 2 tests.
> Or, alternatively can there be other tests in future that can't be
> converted? Naming it "KASAN_USER" looks somewhat overspecialized. Say
> tomorrow we have another test that can't run under Kunit, but is not
> related to copt_from_user, should we create yet another module for it?
> I think the crux of that is that's a module, so a better name may be
> "KASAN_TEST_MODULE". Currently all tests that need to run as module
> are related to copy_from_user, but that's just an implementation
> detail.
>
When I converted the copy_user_tests into KUnit, I was getting a
kernel panic with a "Segfault with no mm." According to Brendan, since
KUnit starts a new kthread and is not invoked via a syscall, things
like copy_to_user won't work in the KUnit framework.
I agree that the naming is too specific, but is KASAN_TEST_MODULE too
generic since the current KASAN_TEST can be built as a module? Maybe
TEST_KASAN can be KUNIT_TEST_KASAN and TEST_KASAN_USER can be
TEST_KASAN_MODULE...
--
Best,
Patricia
next prev parent reply other threads:[~2020-03-24 15:05 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-19 16:42 [RFC PATCH v2 0/3] KASAN/KUnit Integration Patricia Alfonso
2020-03-19 16:42 ` [RFC PATCH v2 1/3] Add KUnit Struct to Current Task Patricia Alfonso
2020-03-24 11:32 ` Dmitry Vyukov
2020-03-24 16:39 ` Alan Maguire
2020-03-24 17:42 ` Patricia Alfonso
2020-03-25 12:42 ` Alan Maguire
2020-03-25 19:00 ` Patricia Alfonso
2020-03-30 19:30 ` Patricia Alfonso
2020-03-31 7:48 ` Dmitry Vyukov
2020-03-24 18:12 ` Brendan Higgins
2020-03-19 16:42 ` [RFC PATCH v2 2/3] KUnit: KASAN Integration Patricia Alfonso
2020-03-24 16:45 ` Alan Maguire
2020-03-24 17:48 ` Patricia Alfonso
2020-03-19 16:42 ` [RFC PATCH v2 3/3] KASAN: Port KASAN Tests to KUnit Patricia Alfonso
2020-03-24 11:24 ` Dmitry Vyukov
2020-03-24 15:05 ` Patricia Alfonso [this message]
2020-03-26 9:12 ` Dmitry Vyukov
2020-03-26 15:15 ` Patricia Alfonso
2020-03-27 5:31 ` Dmitry Vyukov
2020-03-30 18:57 ` Patricia Alfonso
2020-03-31 10:12 ` Dmitry Vyukov
2020-03-24 16:48 ` Alan Maguire
2020-03-24 17:52 ` Patricia Alfonso
2020-03-24 18:20 ` Brendan Higgins
2020-03-26 9:10 ` Dmitry Vyukov
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