linux-kernel - Re: [PATCH 2/4] kexec, KEYS, arm64: Make use of platform keyring for signature verification

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Message-ID: <20220406154533.GM11641@linux-l9pv.suse>
Date:   Wed, 6 Apr 2022 23:45:33 +0800
From:   joeyli <jlee@...e.com>
To:     Michal Suchanek <msuchanek@...e.de>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Philipp Rudo <prudo@...hat.com>, Baoquan He <bhe@...hat.com>,
        Alexander Egorenkov <egorenar@...ux.ibm.com>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        James Morse <james.morse@....com>,
        Dave Young <dyoung@...hat.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Kairui Song <kasong@...hat.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, kexec@...ts.infradead.org,
        keyrings@...r.kernel.org, linux-security-module@...r.kernel.org,
        stable@...nel.org
Subject: Re: [PATCH 2/4] kexec, KEYS, arm64: Make use of platform keyring for
 signature verification

On Tue, Feb 15, 2022 at 08:39:39PM +0100, Michal Suchanek wrote:
> commit 278311e417be ("kexec, KEYS: Make use of platform keyring for signature verify")
> adds platform keyring support on x86 kexec but not arm64.
> 
> Add platform keyring support on arm64 as well.
> 
> Fixes: 278311e417be ("kexec, KEYS: Make use of platform keyring for signature verify")
> Cc: kexec@...ts.infradead.org
> Cc: keyrings@...r.kernel.org
> Cc: linux-security-module@...r.kernel.org
> Cc: stable@...nel.org
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>

Reviewed-by: "Lee, Chun-Yi" <jlee@...e.com>

> ---
>  arch/arm64/kernel/kexec_image.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c
> index 1fbf2ee7c005..3dee7b2d8336 100644
> --- a/arch/arm64/kernel/kexec_image.c
> +++ b/arch/arm64/kernel/kexec_image.c
> @@ -133,9 +133,17 @@ static void *image_load(struct kimage *image,
>  #ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG
>  static int image_verify_sig(const char *kernel, unsigned long kernel_len)
>  {
> -	return verify_pefile_signature(kernel, kernel_len,
> -				       VERIFY_USE_SECONDARY_KEYRING,
> -				       VERIFYING_KEXEC_PE_SIGNATURE);
> +	int ret;
> +
> +	ret = verify_pefile_signature(kernel, kernel_len,
> +				      VERIFY_USE_SECONDARY_KEYRING,
> +				      VERIFYING_KEXEC_PE_SIGNATURE);
> +	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
> +		ret = verify_pefile_signature(kernel, kernel_len,
> +					      VERIFY_USE_PLATFORM_KEYRING,
> +					      VERIFYING_KEXEC_PE_SIGNATURE);
> +	}
> +	return ret;
>  }
>  #endif
>  
> -- 
> 2.31.1