netdev - Re: [PATCH 03/20] devlink: Manual replacement of the deprecated strlcpy() with return values

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Message-ID: <20210222165623.12e31597@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 22 Feb 2021 16:56:23 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Romain Perier <romain.perier@...il.com>
Cc:     Kees Cook <keescook@...omium.org>,
        kernel-hardening@...ts.openwall.com, Jiri Pirko <jiri@...dia.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/20] devlink: Manual replacement of the deprecated
 strlcpy() with return values

On Mon, 22 Feb 2021 16:12:14 +0100 Romain Perier wrote:
> diff --git a/net/core/devlink.c b/net/core/devlink.c
> index 737b61c2976e..7eb445460c92 100644
> --- a/net/core/devlink.c
> +++ b/net/core/devlink.c
> @@ -9461,10 +9461,10 @@ EXPORT_SYMBOL_GPL(devlink_port_param_value_changed);
>  void devlink_param_value_str_fill(union devlink_param_value *dst_val,
>  				  const char *src)
>  {
> -	size_t len;
> +	ssize_t len;
>  
> -	len = strlcpy(dst_val->vstr, src, __DEVLINK_PARAM_MAX_STRING_VALUE);
> -	WARN_ON(len >= __DEVLINK_PARAM_MAX_STRING_VALUE);
> +	len = strscpy(dst_val->vstr, src, __DEVLINK_PARAM_MAX_STRING_VALUE);
> +	WARN_ON(len == -E2BIG);

WARN_ON(len < 0) ?