linux-kernel - Re: [PATCH 1/4] Fix arm64 kexec forbidding kernels signed with keys in the secondary keyring to boot

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Message-ID: <20220406154056.GL11641@linux-l9pv.suse>
Date:   Wed, 6 Apr 2022 23:41:16 +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 1/4] Fix arm64 kexec forbidding kernels signed with keys
 in the secondary keyring to boot

On Tue, Feb 15, 2022 at 08:39:38PM +0100, Michal Suchanek wrote:
> commit d3bfe84129f6 ("certs: Add a secondary system keyring that can be added to dynamically")
> split of .system_keyring into .builtin_trusted_keys and
> .secondary_trusted_keys broke kexec, thereby preventing kernels signed by
> keys which are now in the secondary keyring from being kexec'd.
> 
> Fix this by passing VERIFY_USE_SECONDARY_KEYRING to
> verify_pefile_signature().
> 
> Cherry-picked from
> commit ea93102f3224 ("Fix kexec forbidding kernels signed with keys in the secondary keyring to boot")
> 
> Fixes: 732b7b93d849 ("arm64: kexec_file: add kernel signature verification support")
> 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 | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c
> index 9ec34690e255..1fbf2ee7c005 100644
> --- a/arch/arm64/kernel/kexec_image.c
> +++ b/arch/arm64/kernel/kexec_image.c
> @@ -133,7 +133,8 @@ 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, NULL,
> +	return verify_pefile_signature(kernel, kernel_len,
> +				       VERIFY_USE_SECONDARY_KEYRING,
>  				       VERIFYING_KEXEC_PE_SIGNATURE);
>  }
>  #endif
> -- 
> 2.31.1