linux-kernel - [PATCH v3 2/6] sign-file: move file signing logic to its own function

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Date:   Tue, 14 Feb 2023 00:30:30 +0530
From:   Shreenidhi Shedi <yesshedi@...il.com>
To:     dhowells@...hat.com, dwmw2@...radead.org,
        gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, Shreenidhi Shedi <sshedi@...are.com>
Subject: [PATCH v3 2/6] sign-file: move file signing logic to its own function

Keep the main function bare minimal and do less in main function.

Signed-off-by: Shreenidhi Shedi <sshedi@...are.com>
---
 scripts/sign-file.c | 69 +++++++++++++++++++++++++--------------------
 1 file changed, 39 insertions(+), 30 deletions(-)

diff --git a/scripts/sign-file.c b/scripts/sign-file.c
index cf3acbb13013..4732201feb96 100644
--- a/scripts/sign-file.c
+++ b/scripts/sign-file.c
@@ -230,7 +230,7 @@ struct cmd_opts {
 #endif
 };
 
-void parse_args(int argc, char **argv, struct cmd_opts *opts)
+static void parse_args(int argc, char **argv, struct cmd_opts *opts)
 {
 	struct option cmd_options[] = {
 		/* These options set a flag. */
@@ -315,10 +315,10 @@ void parse_args(int argc, char **argv, struct cmd_opts *opts)
 	} while (opt != -1);
 }
 
-int main(int argc, char **argv)
+int sign_file(int argc, char **argv, struct cmd_opts *opts)
 {
 	struct module_signature sig_info = { .id_type = PKEY_ID_PKCS7 };
-	unsigned char buf[4096];
+	unsigned char buf[4096] = {0};
 	unsigned long module_size, sig_size;
 	unsigned int use_signed_attrs;
 	const EVP_MD *digest_algo;
@@ -331,36 +331,20 @@ int main(int argc, char **argv)
 	X509 *x509;
 	BIO *bd, *bm;
 	int i, n;
-	struct cmd_opts opts = {0};
 
-	OpenSSL_add_all_algorithms();
-	ERR_load_crypto_strings();
-	ERR_clear_error();
-
-	key_pass = getenv("KBUILD_SIGN_PIN");
+	char *hash_algo = opts->hash_algo;
+	char *dest_name = opts->dest_name;
+	char *private_key_name = opts->private_key_name;
+	char *raw_sig_name = opts->raw_sig_name;
+	char *x509_name = opts->x509_name;
+	char *module_name = opts->module_name;
+	bool save_sig = opts->save_sig;
+	bool replace_orig = opts->replace_orig;
+	bool raw_sig = opts->raw_sig;
+	bool sign_only = opts->sign_only;
 
 #ifndef USE_PKCS7
-	use_signed_attrs = CMS_NOATTR;
-#else
-	use_signed_attrs = PKCS7_NOATTR;
-#endif
-	parse_args(argc, argv, &opts);
-	argc -= optind;
-	argv += optind;
-
-	char *hash_algo = opts.hash_algo;
-	char *dest_name = opts.dest_name;
-	char *private_key_name = opts.private_key_name;
-	char *raw_sig_name = opts.raw_sig_name;
-	char *x509_name = opts.x509_name;
-	char *module_name = opts.module_name;
-	bool save_sig = opts.save_sig;
-	bool replace_orig = opts.replace_orig;
-	bool raw_sig = opts.raw_sig;
-	bool sign_only = opts.sign_only;
-
-#ifndef USE_PKCS7
-	unsigned int use_keyid = opts.use_keyid;
+	unsigned int use_keyid = opts->use_keyid;
 #endif
 
 	if (!argv[0] || argc != 1)
@@ -381,6 +365,19 @@ int main(int argc, char **argv)
 		exit(3);
 	}
 #endif
+
+	OpenSSL_add_all_algorithms();
+	ERR_load_crypto_strings();
+	ERR_clear_error();
+
+	key_pass = getenv("KBUILD_SIGN_PIN");
+
+#ifndef USE_PKCS7
+	use_signed_attrs = CMS_NOATTR;
+#else
+	use_signed_attrs = PKCS7_NOATTR;
+#endif
+
 	/* Open the module file */
 	bm = BIO_new_file(module_name, "rb");
 	ERR(!bm, "%s", module_name);
@@ -492,3 +489,15 @@ int main(int argc, char **argv)
 
 	return 0;
 }
+
+int main(int argc, char **argv)
+{
+	struct cmd_opts opts = {0};
+
+	parse_args(argc, argv, &opts);
+
+	argc -= optind;
+	argv += optind;
+
+	return sign_file(argc, argv, &opts);
+}
-- 
2.39.1