linux-kernel - Re: [RFC PATCH v2 2/2] kexec, KEYS: Make use of platform keyring for signature verify

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Date:   Tue, 15 Jan 2019 10:46:58 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Kairui Song <kasong@...hat.com>, linux-kernel@...r.kernel.org
Cc:     dhowells@...hat.com, dwmw2@...radead.org,
        jwboyer@...oraproject.org, keyrings@...r.kernel.org,
        jmorris@...ei.org, serge@...lyn.com, bauerman@...ux.ibm.com,
        ebiggers@...gle.com, nayna@...ux.ibm.com, dyoung@...hat.com,
        linux-integrity@...r.kernel.org, kexec@...ts.infradead.org
Subject: Re: [RFC PATCH v2 2/2] kexec, KEYS: Make use of platform keyring
 for signature verify

On Tue, 2019-01-15 at 17:45 +0800, Kairui Song wrote:

> diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
> index 7d97e432cbbc..a06b04065bb1 100644
> --- a/arch/x86/kernel/kexec-bzimage64.c
> +++ b/arch/x86/kernel/kexec-bzimage64.c
> @@ -534,9 +534,18 @@ static int bzImage64_cleanup(void *loader_data)
>  #ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
>  static int bzImage64_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);
> +#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING

Consider using IS_ENABLED() or IS_BUILTIN().

Mimi

> +	if (ret == -ENOKEY) {
> +		ret = verify_pefile_signature(kernel, kernel_len,
> +				VERIFY_USE_PLATFORM_KEYRING,
> +				VERIFYING_KEXEC_PE_SIGNATURE);
> +	}
> +#endif
> +	return ret;
>  }
>  #endif