linux-kernel - Re: [PATCH] sign-file: simplify main function implementation

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Date:   Fri, 09 Jun 2023 20:38:07 +0300
From:   "Jarkko Sakkinen" <jarkko@...nel.org>
To:     "Tianjia Zhang" <tianjia.zhang@...ux.alibaba.com>,
        "David Howells" <dhowells@...hat.com>,
        "David Woodhouse" <dwmw2@...radead.org>,
        <keyrings@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sign-file: simplify main function implementation

On Thu May 25, 2023 at 11:43 AM EEST, Tianjia Zhang wrote:
> use_signed_attrs is an unnecessary variable, deleting this variable
> can simplify the code.
>
> Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
> ---
>  scripts/sign-file.c | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)
>
> diff --git a/scripts/sign-file.c b/scripts/sign-file.c
> index 94267cf72197..377d586762f9 100644
> --- a/scripts/sign-file.c
> +++ b/scripts/sign-file.c
> @@ -224,7 +224,6 @@ int main(int argc, char **argv)
>  	bool raw_sig = false;
>  	unsigned char buf[4096];
>  	unsigned long module_size, sig_size;
> -	unsigned int use_signed_attrs;
>  	const EVP_MD *digest_algo;
>  	EVP_PKEY *private_key;
>  #ifndef USE_PKCS7
> @@ -242,12 +241,6 @@ int main(int argc, char **argv)
>  
>  	key_pass = getenv("KBUILD_SIGN_PIN");
>  
> -#ifndef USE_PKCS7
> -	use_signed_attrs = CMS_NOATTR;
> -#else
> -	use_signed_attrs = PKCS7_NOATTR;
> -#endif
> -
>  	do {
>  		opt = getopt(argc, argv, "sdpk");
>  		switch (opt) {
> @@ -340,8 +333,7 @@ int main(int argc, char **argv)
>  
>  		ERR(!CMS_add1_signer(cms, x509, private_key, digest_algo,
>  				     CMS_NOCERTS | CMS_BINARY |
> -				     CMS_NOSMIMECAP | use_keyid |
> -				     use_signed_attrs),
> +				     CMS_NOSMIMECAP | CMS_NOATTR | use_keyid),
>  		    "CMS_add1_signer");
>  		ERR(CMS_final(cms, bm, NULL, CMS_NOCERTS | CMS_BINARY) < 0,
>  		    "CMS_final");
> @@ -349,7 +341,7 @@ int main(int argc, char **argv)
>  #else
>  		pkcs7 = PKCS7_sign(x509, private_key, NULL, bm,
>  				   PKCS7_NOCERTS | PKCS7_BINARY |
> -				   PKCS7_DETACHED | use_signed_attrs);
> +				   PKCS7_DETACHED | PKCS7_NOATTR);
>  		ERR(!pkcs7, "PKCS7_sign");
>  #endif
>  
> -- 
> 2.24.3 (Apple Git-128)

I'm sorry but I don't see how this makes our lives better.

If, however, this was part of a larger patch, it might make sense, if
there was a real functional change concerning the same code blocks.

BR, Jarkko