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Message-ID: <d66bc516-c5b1-433c-a128-a28d657efea7@amd.com>
Date: Thu, 14 Mar 2024 08:54:12 -0700
From: Brett Creeley <bcreeley@....com>
To: Ivan Vecera <ivecera@...hat.com>, netdev@...r.kernel.org
Cc: aleksandr.loktionov@...el.com, mschmidt@...hat.com, horms@...nel.org,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Tony Nguyen <anthony.l.nguyen@...el.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
"moderated list:INTEL ETHERNET DRIVERS" <intel-wired-lan@...ts.osuosl.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] i40e: Fix VF MAC filter removal
On 3/13/2024 6:56 AM, Ivan Vecera wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
>
>
> Commit 73d9629e1c8c ("i40e: Do not allow untrusted VF to remove
> administratively set MAC") fixed an issue where untrusted VF was
> allowed to remove its own MAC address although this was assigned
> administratively from PF. Unfortunately the introduced check
> is wrong because it causes that MAC filters for other MAC addresses
> including multi-cast ones are not removed.
>
> <snip>
> if (ether_addr_equal(addr, vf->default_lan_addr.addr) &&
> i40e_can_vf_change_mac(vf))
> was_unimac_deleted = true;
> else
> continue;
>
> if (i40e_del_mac_filter(vsi, al->list[i].addr)) {
> ...
> </snip>
>
> The else path with `continue` effectively skips any MAC filter
> removal except one for primary MAC addr when VF is allowed to do so.
> Fix the check condition so the `continue` is only done for primary
> MAC address.
>
> Fixes: 73d9629e1c8c ("i40e: Do not allow untrusted VF to remove administratively set MAC")
> Signed-off-by: Ivan Vecera <ivecera@...hat.com>
> ---
> drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> index b34c71770887..10267a300770 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> @@ -3143,11 +3143,12 @@ static int i40e_vc_del_mac_addr_msg(struct i40e_vf *vf, u8 *msg)
> /* Allow to delete VF primary MAC only if it was not set
> * administratively by PF or if VF is trusted.
> */
> - if (ether_addr_equal(addr, vf->default_lan_addr.addr) &&
> - i40e_can_vf_change_mac(vf))
> - was_unimac_deleted = true;
> - else
> - continue;
> + if (ether_addr_equal(addr, vf->default_lan_addr.addr)) {
> + if (i40e_can_vf_change_mac(vf))
> + was_unimac_deleted = true;
> + else
> + continue;
> + }
Seems okay to me.
Reviewed-by: Brett Creeley <brett.creeley@....com>
>
> if (i40e_del_mac_filter(vsi, al->list[i].addr)) {
> ret = -EINVAL;
> --
> 2.43.0
>
>
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