netdev - Re: [Intel-wired-lan] [PATCH RESEND] igbvf: Fix rx_buffer

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Date:   Tue, 24 Jan 2023 11:49:43 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Akihiko Odaki <akihiko.odaki@...nix.com>
Cc:     Tony Nguyen <anthony.l.nguyen@...el.com>, netdev@...r.kernel.org,
        Yan Vugenfirer <yvugenfi@...hat.com>,
        linux-kernel@...r.kernel.org,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Yuri Benditovich <yuri.benditovich@...nix.com>,
        Eric Dumazet <edumazet@...gle.com>,
        intel-wired-lan@...ts.osuosl.org, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [Intel-wired-lan] [PATCH RESEND] igbvf: Fix rx_buffer_len

Dear Akihiko,


Thank you for your patch.

Am 24.01.23 um 05:39 schrieb Akihiko Odaki:

Maybe improve the commit message summary to be more specific:

igbvf: Align rx_buffer_len to fix memory corrption

> When rx_buffer_len is not aligned by 1024, igbvf sets the aligned size
> to SRRCTL while the buffer is allocated with the unaligned size. This
> allows the device to write more data than rx_buffer_len, resulting in
> memory corruption. Align rx_buffer_len itself so that the buffer will
> be allocated with the aligned size.
> 
> The condition to split RX packet header, which uses rx_buffer_len, is
> also modified so that it doesn't change the behavior for the same
> actual (unaligned) packet size. Actually the new condition is not
> identical with the old one as it will no longer request splitting when
> the actual packet size is exactly 2048, but that should be negligible.

Is there an easy way to reproduce it?


Kind regards,

Paul


> Fixes: d4e0fe01a38a ("igbvf: add new driver to support 82576 virtual functions")
> Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
> ---
>   drivers/net/ethernet/intel/igbvf/netdev.c | 9 +++++----
>   1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c b/drivers/net/ethernet/intel/igbvf/netdev.c
> index 3a32809510fc..b6bca78198fa 100644
> --- a/drivers/net/ethernet/intel/igbvf/netdev.c
> +++ b/drivers/net/ethernet/intel/igbvf/netdev.c
> @@ -1341,10 +1341,9 @@ static void igbvf_setup_srrctl(struct igbvf_adapter *adapter)
>   	srrctl |= E1000_SRRCTL_DROP_EN;
>   
>   	/* Setup buffer sizes */
> -	srrctl |= ALIGN(adapter->rx_buffer_len, 1024) >>
> -		  E1000_SRRCTL_BSIZEPKT_SHIFT;
> +	srrctl |= adapter->rx_buffer_len >> E1000_SRRCTL_BSIZEPKT_SHIFT;
>   
> -	if (adapter->rx_buffer_len < 2048) {
> +	if (adapter->rx_buffer_len <= 2048) {
>   		adapter->rx_ps_hdr_size = 0;
>   		srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
>   	} else {
> @@ -1625,7 +1624,7 @@ static int igbvf_sw_init(struct igbvf_adapter *adapter)
>   	struct net_device *netdev = adapter->netdev;
>   	s32 rc;
>   
> -	adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN;
> +	adapter->rx_buffer_len = ALIGN(ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN, 1024);
>   	adapter->rx_ps_hdr_size = 0;
>   	adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
>   	adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
> @@ -2429,6 +2428,8 @@ static int igbvf_change_mtu(struct net_device *netdev, int new_mtu)
>   		adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN +
>   					 ETH_FCS_LEN;
>   
> +	adapter->rx_buffer_len = ALIGN(adapter->rx_buffer_len, 1024);
> +
>   	netdev_dbg(netdev, "changing MTU from %d to %d\n",
>   		   netdev->mtu, new_mtu);
>   	netdev->mtu = new_mtu;