linux-kernel - Re: [PATCH v2 1/3] PCI: dwc: allow to limit registers set length

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Message-ID: <20181120151419.GA26247@e107981-ln.cambridge.arm.com>
Date:   Tue, 20 Nov 2018 15:14:19 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Stefan Agner <stefan@...er.ch>
Cc:     jingoohan1@...il.com, gustavo.pimentel@...opsys.com,
        l.stach@...gutronix.de, tpiepho@...inj.com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] PCI: dwc: allow to limit registers set length

On Tue, Nov 20, 2018 at 02:27:03PM +0100, Stefan Agner wrote:
> Add length to the struct dw_pcie and check that the accessors
> dw_pcie_(rd|wr)_own_conf() do not read/write beyond that point.
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 4 ++++
>  drivers/pci/controller/dwc/pcie-designware.h      | 1 +
>  2 files changed, 5 insertions(+)

Hi Stefan,

may I kindly ask you please to rebase this series against my pci/dwc
branch ? I will apply it with Lucas tags then.

Please CC me on the patches.

Thanks,
Lorenzo

> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 29a05759a294..b422538ee0bb 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -29,6 +29,8 @@ static int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
>  		return pp->ops->rd_own_conf(pp, where, size, val);
>  
>  	pci = to_dw_pcie_from_pp(pp);
> +	if (pci->dbi_length && where + size > pci->dbi_length)
> +		return PCIBIOS_BAD_REGISTER_NUMBER;
>  	return dw_pcie_read(pci->dbi_base + where, size, val);
>  }
>  
> @@ -41,6 +43,8 @@ static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
>  		return pp->ops->wr_own_conf(pp, where, size, val);
>  
>  	pci = to_dw_pcie_from_pp(pp);
> +	if (pci->dbi_length && where + size > pci->dbi_length)
> +		return PCIBIOS_BAD_REGISTER_NUMBER;
>  	return dw_pcie_write(pci->dbi_base + where, size, val);
>  }
>  
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 9f1a5e399b70..5be5f369abf2 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -215,6 +215,7 @@ struct dw_pcie {
>  	struct device		*dev;
>  	void __iomem		*dbi_base;
>  	void __iomem		*dbi_base2;
> +	int			dbi_length;
>  	u32			num_viewport;
>  	u8			iatu_unroll_enabled;
>  	struct pcie_port	pp;
> -- 
> 2.19.1
>