linux-kernel - Re: [PATCH] net: ipconfig: replace strncpy with strscpy

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Message-ID: <20250410200559.GW395307@horms.kernel.org>
Date: Thu, 10 Apr 2025 21:05:59 +0100
From: Simon Horman <horms@...nel.org>
To: "Nelson, Shannon" <shannon.nelson@....com>
Cc: Pranav Tyagi <pranav.tyagi03@...il.com>, davem@...emloft.net,
	dsahern@...nel.org, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, skhan@...uxfoundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH] net: ipconfig: replace strncpy with strscpy_pad

On Tue, Apr 08, 2025 at 02:44:42PM -0700, Nelson, Shannon wrote:
> On 4/8/2025 11:57 AM, Pranav Tyagi wrote:
> > 
> > Replace the deprecated strncpy() function with strscpy_pad() as the
> > destination buffer is NUL-terminated and requires
> > trailing NUL-padding
> > 
> > Signed-off-by: Pranav Tyagi <pranav.tyagi03@...il.com>
> 
> There should be a Fixes tag here, and usually we put the 'net' tree
> indicator inside the tag, like this: [PATCH net]

FWIIW, this feels more line net-next material to me:
I'm not seeing a bug that is being fixed.

> 
> 
> > ---
> >   net/ipv4/ipconfig.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
> > index c56b6fe6f0d7..7c238d19328f 100644
> > --- a/net/ipv4/ipconfig.c
> > +++ b/net/ipv4/ipconfig.c
> > @@ -1690,7 +1690,7 @@ static int __init ic_proto_name(char *name)
> >                          *v = 0;
> >                          if (kstrtou8(client_id, 0, dhcp_client_identifier))
> >                                  pr_debug("DHCP: Invalid client identifier type\n");
> > -                       strncpy(dhcp_client_identifier + 1, v + 1, 251);
> > +                       strscpy_pad(dhcp_client_identifier + 1, v + 1, 251);
> 
> The strncpy() action, as well as the memcpy() into dhcp_client_identifier
> elsewhere, are not padding to the end, so I think this only needs to be
> null-terminated, not fully padded.  If full padding is needed, please let
> us know why.
> 
> sln
> 
> >                          *v = ',';
> >                  }
> >                  return 1;
> > --
> > 2.49.0
> > 
> > 
>