netdev - Re: [PATCH 08/12] cdrom: use correct format characters

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Date:   Sun, 12 Jun 2022 17:23:47 +0100
From:   Phillip Potter <phil@...lpotter.co.uk>
To:     Bill Wendling <morbo@...gle.com>
Cc:     isanbard@...il.com, Tony Luck <tony.luck@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Jan Kara <jack@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Ross Philipson <ross.philipson@...cle.com>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-mm@...ck.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, alsa-devel@...a-project.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH 08/12] cdrom: use correct format characters

On Thu, Jun 09, 2022 at 10:16:27PM +0000, Bill Wendling wrote:
> From: Bill Wendling <isanbard@...il.com>
> 
> When compiling with -Wformat, clang emits the following warnings:
> 
> drivers/cdrom/cdrom.c:3454:48: error: format string is not a string literal (potentially insecure) [-Werror,-Wformat-security]
>         ret = scnprintf(info + *pos, max_size - *pos, header);
>                                                       ^~~~~~
> 
> Use a string literal for the format string.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/378
> Signed-off-by: Bill Wendling <isanbard@...il.com>
> ---
>  drivers/cdrom/cdrom.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
> index 416f723a2dbb..52b40120c76e 100644
> --- a/drivers/cdrom/cdrom.c
> +++ b/drivers/cdrom/cdrom.c
> @@ -3451,7 +3451,7 @@ static int cdrom_print_info(const char *header, int val, char *info,
>  	struct cdrom_device_info *cdi;
>  	int ret;
>  
> -	ret = scnprintf(info + *pos, max_size - *pos, header);
> +	ret = scnprintf(info + *pos, max_size - *pos, "%s", header);
>  	if (!ret)
>  		return 1;
>  
> -- 
> 2.36.1.255.ge46751e96f-goog
> 

Hi Bill,

Thank you for the patch, much appreciated.

Looking at this though, all callers of cdrom_print_info() provide 'header'
as a string literal defined within the driver, when making the call.
Therefore, I'm not convinced this change is necessary for cdrom.c -
that said, in this particular use case I don't think it would hurt
either.

I've followed the other responses on parts of this series, so I
understand that a different solution is potentially in the works.
Thought I'd respond anyway though out of courtesy.

All the best,
Phil (Uniform CDROM Maintainer)