linux-kernel - Re: [PATCH v5 2/6] powerpc/kexec_file: Add KEXEC

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Date:   Sun, 13 Feb 2022 21:59:57 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Michal Suchanek <msuchanek@...e.de>, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-integrity@...r.kernel.org
Cc:     kexec@...ts.infradead.org, Philipp Rudo <prudo@...hat.com>,
        Nayna <nayna@...ux.vnet.ibm.com>, Rob Herring <robh@...nel.org>,
        linux-s390@...r.kernel.org, Vasily Gorbik <gor@...ux.ibm.com>,
        Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Jessica Yu <jeyu@...nel.org>, linux-kernel@...r.kernel.org,
        David Howells <dhowells@...hat.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Paul Mackerras <paulus@...ba.org>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org,
        Frank van der Linden <fllinden@...zon.com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        Daniel Axtens <dja@...ens.net>, buendgen@...ibm.com,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Baoquan He <bhe@...hat.com>,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH v5 2/6] powerpc/kexec_file: Add KEXEC_SIG support.

Hi Michal,

On Tue, 2022-01-11 at 12:37 +0100, Michal Suchanek wrote:
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index dea74d7717c0..1cde9b6c5987 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -560,6 +560,22 @@ config KEXEC_FILE
>  config ARCH_HAS_KEXEC_PURGATORY
>         def_bool KEXEC_FILE
>  
> +config KEXEC_SIG
> +       bool "Verify kernel signature during kexec_file_load() syscall"
> +       depends on KEXEC_FILE && MODULE_SIG_FORMAT
> +       help
> +         This option makes kernel signature verification mandatory for
> +         the kexec_file_load() syscall.

When KEXEC_SIG is enabled on other architectures, IMA does not define a
kexec 'appraise' policy rule.  Refer to the policy rules in
security/ima/ima_efi.c.  Similarly the kexec 'appraise' policy rule in
arch/powerpc/kernel/ima_policy.c should not be defined.

-- 
thanks,

Mimi