netdev - Re: [PATCH v5 net-next: rds] replace strncpy with strscpy

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Message-ID: <f0ee3606-1068-4899-8e66-a5e7ec716b0d@linux.dev>
Date: Tue, 20 May 2025 23:13:39 +0200
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Baris Can Goral <goralbaris@...il.com>, allison.henderson@...cle.com
Cc: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org,
 kuba@...nel.org, linux-rdma@...r.kernel.org,
 michal.swiatkowski@...ux.intel.com, netdev@...r.kernel.org,
 pabeni@...hat.com, shankari.ak0208@...il.com, skhan@...uxfoundation.org
Subject: Re: [PATCH v5 net-next: rds] replace strncpy with strscpy_pad

在 2025/5/20 18:23, Baris Can Goral 写道:
> The strncpy() function is actively dangerous to use since it may not
> NULL-terminate the destination string, resulting in potential memory
> content exposures, unbounded reads, or crashes.
> 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.

Please don't reply to an old thread when starting a new version.

It is better to start a new thread with the new version.

Zhu Yanjun
> 
> Signed-off-by: Baris Can Goral <goralbaris@...il.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),