netdev - Re: [PATCH v3 net-next: rds] replace strncpy with strscpy

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Message-ID: <aCrXQtrGMIntkcZs@mev-dev.igk.intel.com>
Date: Mon, 19 May 2025 09:01:22 +0200
From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To: goralbaris <goralbaris@...il.com>
Cc: horms@...nel.org, allison.henderson@...cle.com, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, linux-rdma@...r.kernel.org,
	pabeni@...hat.com, skhan@...uxfoundation.org,
	shankari.ak0208@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH v3 net-next: rds] replace strncpy with strscpy_pad

On Sun, May 18, 2025 at 10:53:29PM +0300, goralbaris wrote:
> The strncpy() function is actively dangerous to use since it may not
> NULL-terminate the destination string, resulting in potential memory.
> Link: https://github.com/KSPP/linux/issues/90
> 
> In addition, strscpy_pad is more appropriate because it also zero-fills 
> any remaining space in the destination if the source is shorter than 
> the provided buffer size.
> 
> Signed-off-by: goralbaris <goralbaris@...il.com>

There should be your full name, not nick.

Feel free to add my RB tag
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>

> ---
>  net/rds/connection.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/net/rds/connection.c b/net/rds/connection.c
> index c749c5525b40..d62f486ab29f 100644
> --- a/net/rds/connection.c
> +++ b/net/rds/connection.c
> @@ -749,8 +749,7 @@ static int rds_conn_info_visitor(struct rds_conn_path *cp, void *buffer)
>  	cinfo->laddr = conn->c_laddr.s6_addr32[3];
>  	cinfo->faddr = conn->c_faddr.s6_addr32[3];
>  	cinfo->tos = conn->c_tos;
> -	strncpy(cinfo->transport, conn->c_trans->t_name,
> -		sizeof(cinfo->transport));
> +	strscpy_pad(cinfo->transport, conn->c_trans->t_name);
>  	cinfo->flags = 0;
>  
>  	rds_conn_info_set(cinfo->flags, test_bit(RDS_IN_XMIT, &cp->cp_flags),
> @@ -775,8 +774,7 @@ static int rds6_conn_info_visitor(struct rds_conn_path *cp, void *buffer)
>  	cinfo6->next_rx_seq = cp->cp_next_rx_seq;
>  	cinfo6->laddr = conn->c_laddr;
>  	cinfo6->faddr = conn->c_faddr;
> -	strncpy(cinfo6->transport, conn->c_trans->t_name,
> -		sizeof(cinfo6->transport));
> +	strscpy_pad(cinfo6->transport, conn->c_trans->t_name);
>  	cinfo6->flags = 0;
>  
>  	rds_conn_info_set(cinfo6->flags, test_bit(RDS_IN_XMIT, &cp->cp_flags),
> -- 
> 2.34.1