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Date: Wed, 15 May 2019 18:02:00 -0700
From: Kees Cook <>
To: Alexander Potapenko <>
	Nick Desaulniers <>,
	Kostya Serebryany <>,
	Dmitry Vyukov <>,
	Sandeep Patil <>,
	Laura Abbott <>, Jann Horn <>,,
Subject: Re: [PATCH v2 2/4] lib: introduce test_meminit module

On Tue, May 14, 2019 at 04:35:35PM +0200, Alexander Potapenko wrote:
> Add tests for heap and pagealloc initialization.
> These can be used to check init_on_alloc and init_on_free implementations
> as well as other approaches to initialization.

This is nice! Easy way to test the results. It might be helpful to show
here what to expect when loading this module:

with either init_on_alloc=1 or init_on_free=1, I happily see:

	test_meminit: all 10 tests in test_pages passed
	test_meminit: all 40 tests in test_kvmalloc passed
	test_meminit: all 20 tests in test_kmemcache passed
	test_meminit: all 70 tests passed!

and without:

	test_meminit: test_pages failed 10 out of 10 times
	test_meminit: test_kvmalloc failed 40 out of 40 times
	test_meminit: test_kmemcache failed 10 out of 20 times
	test_meminit: failures: 60 out of 70

> Signed-off-by: Alexander Potapenko <>

Reviewed-by: Kees Cook <>
Tested-by: Kees Cook <>

note below...

> [...]
> diff --git a/lib/test_meminit.c b/lib/test_meminit.c
> new file mode 100644
> index 000000000000..67d759498030
> --- /dev/null
> +++ b/lib/test_meminit.c
> @@ -0,0 +1,205 @@
> +// SPDX-License-Identifier: GPL-2.0
> [...]
> +module_init(test_meminit_init);

I get a warning at build about missing the license:

WARNING: modpost: missing MODULE_LICENSE() in lib/test_meminit.o

So, following the SPDX line, just add:


Kees Cook

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