linux-kernel - Re: [PATCH v5 RESEND] sign-file: Fix incorrect return values check

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Message-Id: <CXNF0UTRENI8.S6ZOFO151V3M@suppilovahvero>
Date:   Wed, 13 Dec 2023 20:25:37 +0200
From:   "Jarkko Sakkinen" <jarkko@...nel.org>
To:     "Yusong Gao" <a869920004@...il.com>, <davem@...emloft.net>,
        <dhowells@...hat.com>, <dwmw2@...radead.org>, <juergh@...ton.me>,
        <zohar@...ux.ibm.com>, <herbert@...dor.apana.org.au>,
        <lists@...ience.com>, <dimitri.ledkov@...onical.com>
Cc:     <keyrings@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH v5 RESEND] sign-file: Fix incorrect return values check

On Wed Dec 13, 2023 at 4:44 AM EET, Yusong Gao wrote:
> There are some wrong return values check in sign-file when call OpenSSL
> API. The ERR() check cond is wrong because of the program only check the
> return value is < 0 which ignored the return val is 0. For example:
> 1. CMS_final() return 1 for success or 0 for failure.
> 2. i2d_CMS_bio_stream() returns 1 for success or 0 for failure.
> 3. i2d_TYPEbio() return 1 for success and 0 for failure.
q
>
> Link: https://www.openssl.org/docs/manmaster/man3/
> Fixes: e5a2e3c84782 ("scripts/sign-file.c: Add support for signing with a raw signature")

Given that:

$ git describe --contains  e5a2e3c84782
v4.6-rc1~127^2^2~14

Should have also:

Cc: stable@...r.kernel.org # v4.6+


> Signed-off-by: Yusong Gao <a869920004@...il.com>
> Reviewed-by: Juerg Haefliger <juerg.haefliger@...onical.com>
> ---
> V5: No change.
> V4: Change to more strict check mode.
> V3: Removed redundant empty line.
> V1, V2: Clarify the description of git message.
> ---
>  scripts/sign-file.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/scripts/sign-file.c b/scripts/sign-file.c
> index 598ef5465f82..3edb156ae52c 100644
> --- a/scripts/sign-file.c
> +++ b/scripts/sign-file.c
> @@ -322,7 +322,7 @@ int main(int argc, char **argv)
>  				     CMS_NOSMIMECAP | use_keyid |
>  				     use_signed_attrs),
>  		    "CMS_add1_signer");
> -		ERR(CMS_final(cms, bm, NULL, CMS_NOCERTS | CMS_BINARY) < 0,
> +		ERR(CMS_final(cms, bm, NULL, CMS_NOCERTS | CMS_BINARY) != 1,
>  		    "CMS_final");
>  
>  #else
> @@ -341,10 +341,10 @@ int main(int argc, char **argv)
>  			b = BIO_new_file(sig_file_name, "wb");
>  			ERR(!b, "%s", sig_file_name);
>  #ifndef USE_PKCS7
> -			ERR(i2d_CMS_bio_stream(b, cms, NULL, 0) < 0,
> +			ERR(i2d_CMS_bio_stream(b, cms, NULL, 0) != 1,
>  			    "%s", sig_file_name);
>  #else
> -			ERR(i2d_PKCS7_bio(b, pkcs7) < 0,
> +			ERR(i2d_PKCS7_bio(b, pkcs7) != 1,
>  			    "%s", sig_file_name);
>  #endif
>  			BIO_free(b);
> @@ -374,9 +374,9 @@ int main(int argc, char **argv)
>  
>  	if (!raw_sig) {
>  #ifndef USE_PKCS7
> -		ERR(i2d_CMS_bio_stream(bd, cms, NULL, 0) < 0, "%s", dest_name);
> +		ERR(i2d_CMS_bio_stream(bd, cms, NULL, 0) != 1, "%s", dest_name);
>  #else
> -		ERR(i2d_PKCS7_bio(bd, pkcs7) < 0, "%s", dest_name);
> +		ERR(i2d_PKCS7_bio(bd, pkcs7) != 1, "%s", dest_name);
>  #endif
>  	} else {
>  		BIO *b;
> @@ -396,7 +396,7 @@ int main(int argc, char **argv)
>  	ERR(BIO_write(bd, &sig_info, sizeof(sig_info)) < 0, "%s", dest_name);
>  	ERR(BIO_write(bd, magic_number, sizeof(magic_number) - 1) < 0, "%s", dest_name);
>  
> -	ERR(BIO_free(bd) < 0, "%s", dest_name);
> +	ERR(BIO_free(bd) != 1, "%s", dest_name);
>  
>  	/* Finally, if we're signing in place, replace the original. */
>  	if (replace_orig)


BR, Jarkko