netdev - Re: [PATCH net v2 2/4] llc: Improve setsockopt() handling of malformed user input

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Message-ID: <84e5987e-ff03-4fab-a042-679f76f341e9@davidwei.uk>
Date: Fri, 15 Nov 2024 16:59:17 -0800
From: David Wei <dw@...idwei.uk>
To: Michal Luczaj <mhal@...x.co>, Marcel Holtmann <marcel@...tmann.org>,
 Johan Hedberg <johan.hedberg@...il.com>,
 Luiz Augusto von Dentz <luiz.dentz@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
 David Howells <dhowells@...hat.com>, Marc Dionne <marc.dionne@...istor.com>
Cc: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
 linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
 linux-afs@...ts.infradead.org, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net v2 2/4] llc: Improve setsockopt() handling of
 malformed user input

On 2024-11-15 05:21, Michal Luczaj wrote:
> copy_from_sockptr()'s non-zero result represents the number of bytes that
> could not be copied. Turn that into EFAULT.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Michal Luczaj <mhal@...x.co>
> ---
>  net/llc/af_llc.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
> index 4eb52add7103b0f83d6fe7318abf1d1af533d254..711c8a7a423f1cf1b03e684a6e23c8eefbab830f 100644
> --- a/net/llc/af_llc.c
> +++ b/net/llc/af_llc.c
> @@ -1096,12 +1096,12 @@ static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
>  	int rc = -EINVAL;
>  
>  	lock_sock(sk);
> -	if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
> +	if (unlikely(level != SOL_LLC || optlen != sizeof(opt)))
>  		goto out;
> -	rc = copy_from_sockptr(&opt, optval, sizeof(opt));
> -	if (rc)
> +	if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
> +		rc = -EFAULT;
>  		goto out;
> -	rc = -EINVAL;
> +	}
>  	switch (optname) {
>  	case LLC_OPT_RETRY:
>  		if (opt > LLC_OPT_MAX_RETRY)
> 

Can copy_from_sockptr() be deprecated here in favour of
copy_safe_from_sockptr()?