linux-hardening - Re: [PATCH 2/4] fortify: test: Use kunit

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Date: Fri, 8 Dec 2023 15:38:56 +0800
From: David Gow <davidgow@...gle.com>
To: Kees Cook <keescook@...omium.org>
Cc: Rae Moar <rmoar@...gle.com>, Brendan Higgins <brendan.higgins@...ux.dev>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Matti Vaittinen <mazziesaccount@...il.com>, 
	Stephen Boyd <sboyd@...nel.org>, Shuah Khan <skhan@...uxfoundation.org>, 
	Jonathan Corbet <corbet@....net>, Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, Maxime Ripard <mripard@...nel.org>, 
	linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-hardening@...r.kernel.org, linux-sound@...r.kernel.org
Subject: Re: [PATCH 2/4] fortify: test: Use kunit_device

On Thu, 7 Dec 2023 at 05:07, Kees Cook <keescook@...omium.org> wrote:
>
> On Tue, Dec 05, 2023 at 03:31:34PM +0800, davidgow@...gle.com wrote:
> > Using struct root_device to create fake devices for tests is something
> > of a hack. The new struct kunit_device is meant for this purpose, so use
> > it instead.
> >
> > Signed-off-by: David Gow <davidgow@...gle.com>
> > ---
> >  lib/fortify_kunit.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/lib/fortify_kunit.c b/lib/fortify_kunit.c
> > index c8c33cbaae9e..f7a1fce8849b 100644
> > --- a/lib/fortify_kunit.c
> > +++ b/lib/fortify_kunit.c
> > @@ -16,6 +16,7 @@
> >  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> >
> >  #include <kunit/test.h>
> > +#include <kunit/device.h>
> >  #include <linux/device.h>
> >  #include <linux/slab.h>
> >  #include <linux/string.h>
> > @@ -269,7 +270,7 @@ DEFINE_ALLOC_SIZE_TEST_PAIR(kvmalloc)
> >       size_t len;                                                     \
> >                                                                       \
> >       /* Create dummy device for devm_kmalloc()-family tests. */      \
> > -     dev = root_device_register(dev_name);                           \
> > +     dev = kunit_device_register(test, dev_name);                    \
> >       KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev),                       \
> >                              "Cannot register test device\n");        \
> >                                                                       \
> > @@ -303,7 +304,7 @@ DEFINE_ALLOC_SIZE_TEST_PAIR(kvmalloc)
> >       checker(len, devm_kmemdup(dev, "Ohai", len, gfp),               \
> >               devm_kfree(dev, p));                                    \
> >                                                                       \
> > -     device_unregister(dev);                                         \
> > +     kunit_device_unregister(test, dev);                             \
> >  } while (0)
> >  DEFINE_ALLOC_SIZE_TEST_PAIR(devm_kmalloc)
>
> Acked-by: Kees Cook <keescook@...omium.org>
>
> (As an aside; shouldn't this get automatically cleaned up like other
> kunit resources, though?)
>

We can't just get rid of the {kunit_,}device_unregister() here,
because otherwise we'd have several devices with the same name during
the test.

So, yes, these get automatically cleaned up, but the test would have
to be restructured to either give each device a different name, or
split the tests up further.

-- David