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From: Timur Tabi <timur@codeaurora.org>
To: Stephen Boyd <sboyd@codeaurora.org>,
	Linus Walleij <linus.walleij@linaro.org>
Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	linux-gpio@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH 3/3] pinctrl: qcom: Don't allow protected pins to be requested
Date: Mon, 22 Jan 2018 07:55:39 -0600	[thread overview]
Message-ID: <f384a6c4-57a5-df18-862c-bf7dad9ea3f4@codeaurora.org> (raw)
In-Reply-To: <20180110015848.11480-4-sboyd@codeaurora.org>

On 1/9/18 7:58 PM, Stephen Boyd wrote:
> +		ret = device_property_read_u16_array(pctrl->dev, "gpios", tmp,
> +						     len);
> +		if (ret < 0) {
> +			dev_err(pctrl->dev, "could not read list of GPIOs\n");
> +			kfree(tmp);
> +			return ret;
> +		}

Just FYI, I'm still going to have to parse "gpios" in my 
pinctrl-qdf2xxx.c driver, even though you're also parsing it here. 
That's because I need to make sure that the msm_pingroup array only 
contains "approve" addresses in its ctl_reg fields.

+	for (i = 0; i < avail_gpios; i++) {
+		unsigned int gpio = gpios[i];
+
+		groups[gpio].npins = 1;
+		snprintf(names[i], NAME_SIZE, "gpio%u", gpio);
+		pins[gpio].name = names[i];
+		groups[gpio].name = names[i];
+
+		groups[gpio].ctl_reg = 0x10000 * gpio;
  		       ^^^^

I do this because I need to make sure that "unapproved" physical 
addresses are never store anywhere in groups[].  That way, it's 
impossible for the driver to cause an XPU violation -- the worst that 
can happen is a null pointer dereference.

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm
Technologies, Inc.  Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.

  parent reply	other threads:[~2018-01-22 13:55 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-10  1:58 [PATCH 0/3] Support qcom pinctrl protected pins Stephen Boyd
     [not found] ` <20180110015848.11480-1-sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-01-10  1:58   ` [PATCH 1/3] gpiolib: Export gpiochip_irqchip_irq_valid() to drivers Stephen Boyd
2018-01-10  6:16     ` Bjorn Andersson
2018-01-10 13:22     ` Linus Walleij
2018-01-10  1:58 ` [PATCH 2/3] dt-bindings: pinctrl: Add a ngpios-ranges property Stephen Boyd
2018-01-10 12:54   ` Andy Shevchenko
     [not found]   ` <20180110015848.11480-3-sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-01-10 13:37     ` Linus Walleij
2018-01-10 16:37       ` Stephen Boyd
2018-01-10 17:59         ` Andy Shevchenko
2018-01-11 16:33       ` Grant Likely
2018-01-11 16:36         ` Timur Tabi
2018-01-11 19:56           ` Grant Likely
2018-01-10  1:58 ` [PATCH 3/3] pinctrl: qcom: Don't allow protected pins to be requested Stephen Boyd
2018-01-10  6:11   ` Bjorn Andersson
2018-01-22 13:55   ` Timur Tabi [this message]
2018-01-22 20:03     ` Timur Tabi
2018-01-25 21:51     ` Stephen Boyd
2018-01-25 21:53       ` Timur Tabi
2018-01-25 20:48   ` Timur Tabi

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