lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Sun, 12 Apr 2015 12:31:34 +0200
From:	Jakub KiciƄski <moorray3@...pl>
To:	Felix Fietkau <nbd@...nwrt.org>
Cc:	netdev@...r.kernel.org, zajec5@...il.com, hauke@...ke-m.de
Subject: Re: [PATCH 4/4] bgmac: fix DMA rx corruption

On Sun, 12 Apr 2015 12:08:12 +0200, Felix Fietkau wrote:
> The driver needs to inform the hardware about the first invalid (not yet
> filled) rx slot, by writing its DMA descriptor pointer offset to the
> BGMAC_DMA_RX_INDEX register.
> 
> This register was set to a value exceeding the rx ring size, effectively
> allowing the hardware constant access to the full ring, regardless of
> which slots are initialized.
> 
> Fix this by updating the register in bgmac_dma_rx_setup_desc.
> 
> Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
> ---
>  drivers/net/ethernet/broadcom/bgmac.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
> index e332de8..856ceee 100644
> --- a/drivers/net/ethernet/broadcom/bgmac.c
> +++ b/drivers/net/ethernet/broadcom/bgmac.c
> @@ -380,6 +380,12 @@ static void bgmac_dma_rx_setup_desc(struct bgmac *bgmac,
>  	dma_desc->addr_high = cpu_to_le32(upper_32_bits(ring->slots[desc_idx].dma_addr));
>  	dma_desc->ctl0 = cpu_to_le32(ctl0);
>  	dma_desc->ctl1 = cpu_to_le32(ctl1);
> +
> +	desc_idx = (desc_idx + 1) % BGMAC_RX_RING_SLOTS;
> +
> +	bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX,
> +			ring->index_base +
> +			desc_idx * sizeof(struct bgmac_dma_desc));
>  }

Newb question if I may: why is no mem barrier necessary in this case?
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists