linux-kernel - Re: [PATCH v2] net/smc: Replace use of strncpy on NUL-terminated string with strscpy

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Message-ID: <7bd60e6d-4b33-4a04-998b-0be163a6fdb0@linux.ibm.com>
Date: Tue, 2 Sep 2025 12:10:01 +0530
From: Mahanta Jambigi <mjambigi@...ux.ibm.com>
To: James Flowers <bold.zone2373@...tmail.com>, alibuda@...ux.alibaba.com,
        dust.li@...ux.alibaba.com, sidraya@...ux.ibm.com, wenjia@...ux.ibm.com,
        tonylu@...ux.alibaba.com, guwen@...ux.alibaba.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        horms@...nel.org, skhan@...uxfoundation.org
Cc: linux-rdma@...r.kernel.org, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH v2] net/smc: Replace use of strncpy on NUL-terminated
 string with strscpy



On 01/09/25 8:34 am, James Flowers wrote:
> strncpy is deprecated for use on NUL-terminated strings, as indicated in
> Documentation/process/deprecated.rst. strncpy NUL-pads the destination
> buffer and doesn't guarantee the destination buffer will be NUL
> terminated.
> 
> Signed-off-by: James Flowers <bold.zone2373@...tmail.com>
> ---
> V1 -> V2: Replaced with two argument version of strscpy
> Note: this has only been compile tested.
> 
>  net/smc/smc_pnet.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c
> index 76ad29e31d60..b90337f86e83 100644
> --- a/net/smc/smc_pnet.c
> +++ b/net/smc/smc_pnet.c
> @@ -450,7 +450,7 @@ static int smc_pnet_add_ib(struct smc_pnettable *pnettable, char *ib_name,
>  		return -ENOMEM;
>  	new_pe->type = SMC_PNET_IB;
>  	memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN);
> -	strncpy(new_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX);
> +	strscpy(new_pe->ib_name, ib_name);

I tested your changes by creating a Software PNET ID using *smc_pnet*
tool & it works fine. Your changes are similar to ae2402b(net/smc:
replace strncpy with strscpy) commit.

Reviewed-by: Mahanta Jambigi <mjambigi@...ux.ibm.com>

>  	new_pe->ib_port = ib_port;
>  
>  	new_ibdev = true;