Re: [PATCH] wifi: iwlwifi: dvm: Add struct_group for struct iwl_keyinfo keys

[Johannes Berg]

On Sat, 2023-02-18 at 11:11 -0800, Kees Cook wrote:
> 
>  	case WLAN_CIPHER_SUITE_CCMP:
>  		key_flags |= STA_KEY_FLG_CCMP;
> -		memcpy(sta_cmd.key.key, keyconf->key, keyconf->keylen);
> +		memcpy(&sta_cmd.key.keys, keyconf->key, keyconf->keylen);

This should be fine though, only up to 16 bytes for CCMP.

>  	case WLAN_CIPHER_SUITE_TKIP:
>  		key_flags |= STA_KEY_FLG_TKIP;
>  		sta_cmd.key.tkip_rx_tsc_byte2 = tkip_iv32;
>  		for (i = 0; i < 5; i++)
>  			sta_cmd.key.tkip_rx_ttak[i] = cpu_to_le16(tkip_p1k[i]);
> -		memcpy(sta_cmd.key.key, keyconf->key, keyconf->keylen);
> +		memcpy(&sta_cmd.key.keys, keyconf->key, keyconf->keylen);

And that's actually a bug, we should've copied only 16 bytes, I guess.
DVM didn't support MIC offload anyway (at least the way Linux uses the
firmware, though I thought it doesn't at all), so we don't need the MIC
RX/TX keys in there, but anyway the sequence counter values are not part
of the key material on the host.

I don't think I have a machine now to test this with (nor a TKIP AP, of
course, but that could be changed) - but I suspect that since we
actually calculate the TTAK above, we might not even need this memcpy()
at all?

johannes