linux-kernel - Re: [PATCH 2/2] certs: Add FIPS selftests

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Date:   Mon, 27 Jun 2022 09:16:59 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Simo Sorce <simo@...hat.com>,
        Jarkko Sakkinen <jarkko@...nel.org>, keyrings@...r.kernel.org,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] certs: Add FIPS selftests

Hi David,

On Tue, Jun 14, 2022 at 12:29 AM David Howells <dhowells@...hat.com> wrote:
> Add some selftests for signature checking when FIPS mode is enabled.  These
> need to be done before we start actually using the signature checking for
> things and must panic the kernel upon failure.
>
> Note that the tests must not check the blacklist lest this provide a way to
> prevent a kernel from booting by installing a hash of a test key in the
> appropriate UEFI table.
>
> Reported-by: Simo Sorce <simo@...hat.com>
> Signed-off-by: David Howells <dhowells@...hat.com>

Thanks for your patch, which is now commit 3cde3174eb910513 ("certs:
Add FIPS selftests") in v5.19-rc4.

> --- a/crypto/asymmetric_keys/Kconfig
> +++ b/crypto/asymmetric_keys/Kconfig
> @@ -75,4 +75,14 @@ config SIGNED_PE_FILE_VERIFICATION
>           This option provides support for verifying the signature(s) on a
>           signed PE binary.
>
> +config FIPS_SIGNATURE_SELFTEST
> +       bool "Run FIPS selftests on the X.509+PKCS7 signature verification"

Is there any reason this cannot be tristate, so I can always enable
this as a module, and run the test by loading the module whenever
I want?

> +       help
> +         This option causes some selftests to be run on the signature
> +         verification code, using some built in data.  This is required
> +         for FIPS.
> +       depends on KEYS
> +       depends on ASYMMETRIC_KEY_TYPE
> +       depends on PKCS7_MESSAGE_PARSER
> +

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds