linux-kernel - Re: [PATCH v4 25/45] kmsan: add tests for KMSAN

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Date:   Tue, 2 Aug 2022 19:29:02 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Christoph Hellwig <hch@....de>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Ingo Molnar <mingo@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Kees Cook <keescook@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthew Wilcox <willy@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Pekka Enberg <penberg@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 25/45] kmsan: add tests for KMSAN

On Tue, Jul 12, 2022 at 4:17 PM Marco Elver <elver@...gle.com> wrote:
>

> > +static void test_params(struct kunit *test)
> > +{
> > +#ifdef CONFIG_KMSAN_CHECK_PARAM_RETVAL
>
> if (IS_ENABLED(...))
>
Not sure this is valid C, given that EXPECTATION_UNINIT_VALUE_FN
introduces a variable declaration.

> > +       if (vbuf)
> > +               vunmap(vbuf);
> > +       for (i = 0; i < npages; i++)
>
> add { }
>
Done.


> if (IS_ENABLED(CONFIG_KMSAN_CHECK_PARAM_RETVAL))
>
Same as above.

> > +static void unregister_tracepoints(struct tracepoint *tp, void *ignore)
> > +{
> > +       if (!strcmp(tp->name, "console"))
> > +               tracepoint_probe_unregister(tp, probe_console, NULL);
> > +}
> > +
> > +/*
> > + * We only want to do tracepoints setup and teardown once, therefore we have to
> > + * customize the init and exit functions and cannot rely on kunit_test_suite().
> > + */
>
> This is no longer true. See a recent version of
> mm/kfence/kfence_test.c which uses the new suite_init/exit.

Done.

> > +late_initcall_sync(kmsan_test_init);
> > +module_exit(kmsan_test_exit);
> > +
> > +MODULE_LICENSE("GPL v2");
>
> A recent version of checkpatch should complain about this, wanting
> only "GPL" instead of "GPL v2".
>
Fixed.