ACK: [SRU Focal:oem-5.6 1/1] net/nfc/rawsock.c: add CAP_NET_RAW check.

[Kleber Souza]

On 29.09.20 13:31, Thadeu Lima de Souza Cascardo wrote:
> From: Qingyu Li <ieatmuttonchuan at gmail.com>
> 
> When creating a raw AF_NFC socket, CAP_NET_RAW needs to be checked first.
> 
> Signed-off-by: Qingyu Li <ieatmuttonchuan at gmail.com>
> Signed-off-by: David S. Miller <davem at davemloft.net>
> (cherry picked from commit 26896f01467a28651f7a536143fe5ac8449d4041)
> CVE-2020-26088
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo at canonical.com>

Acked-by: Kleber Sacilotto de Souza <kleber.souza at canonical.com>

> ---
>  net/nfc/rawsock.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/net/nfc/rawsock.c b/net/nfc/rawsock.c
> index ba5ffd3badd3..b5c867fe3232 100644
> --- a/net/nfc/rawsock.c
> +++ b/net/nfc/rawsock.c
> @@ -332,10 +332,13 @@ static int rawsock_create(struct net *net, struct socket *sock,
>  	if ((sock->type != SOCK_SEQPACKET) && (sock->type != SOCK_RAW))
>  		return -ESOCKTNOSUPPORT;
>  
> -	if (sock->type == SOCK_RAW)
> +	if (sock->type == SOCK_RAW) {
> +		if (!capable(CAP_NET_RAW))
> +			return -EPERM;
>  		sock->ops = &rawsock_raw_ops;
> -	else
> +	} else {
>  		sock->ops = &rawsock_ops;
> +	}
>  
>  	sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto, kern);
>  	if (!sk)
>