netdev - Re: [PATCH net-next 1/6] net: prefer strscpy over strcpy

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Message-ID: <a60d4c8f-409e-4149-9eae-64bb3ea2e6bf@stanley.mountain>
Date: Tue, 27 Aug 2024 15:30:26 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Hongbo Li <lihongbo22@...wei.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, dsahern@...nel.org, ralf@...ux-mips.org,
	jmaloy@...hat.com, ying.xue@...driver.com, netdev@...r.kernel.org,
	linux-hams@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH net-next 1/6] net: prefer strscpy over strcpy

On Tue, Aug 27, 2024 at 07:35:22PM +0800, Hongbo Li wrote:
> The deprecated helper strcpy() performs no bounds checking on the
> destination buffer. This could result in linear overflows beyond
> the end of the buffer, leading to all kinds of misbehaviors.
> The safe replacement is strscpy() [1].
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strcpy [1]
> 
> Signed-off-by: Hongbo Li <lihongbo22@...wei.com>
> ---
>  net/core/dev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 0d0b983a6c21..f5e0a0d801fd 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -11121,7 +11121,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
>  	if (!dev->ethtool)
>  		goto free_all;
>  
> -	strcpy(dev->name, name);
> +	strscpy(dev->name, name, sizeof(dev->name));

You can just do:

	strscpy(dev->name, name);

I prefer this format because it ensures that dev->name is an array and not a
pointer.  Also shorter.

regards,
dan carpenter