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Thu, 28 Aug 2025 09:00:44 -0700 (PDT) From: Bartosz Golaszewski Date: Thu, 28 Aug 2025 18:00:23 +0200 Subject: [PATCH v6 15/15] pinctrl: qcom: make the pinmuxing strict Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250828-pinctrl-gpio-pinfuncs-v6-15-c9abb6bdb689@linaro.org> References: <20250828-pinctrl-gpio-pinfuncs-v6-0-c9abb6bdb689@linaro.org> In-Reply-To: <20250828-pinctrl-gpio-pinfuncs-v6-0-c9abb6bdb689@linaro.org> To: Linus Walleij , Bjorn Andersson , Konrad Dybcio , Alexey Klimov , Lorenzo Bianconi , Sean Wang , Matthias Brugger , AngeloGioacchino Del Regno , Paul Cercueil , Kees Cook , Andy Shevchenko , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Dong Aisheng , Fabio Estevam , Shawn Guo , Jacky Bai , Pengutronix Kernel Team , NXP S32 Linux Team , Sascha Hauer , Tony Lindgren , Haojian Zhuang , Geert Uytterhoeven , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Neil Armstrong , Mark Brown Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, imx@lists.linux.dev, linux-omap@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Bartosz Golaszewski , Konrad Dybcio X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1142; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=M6AAfE1ZYIqFZsBoDZ4O1bJllvK/6bMXFJ6Zryc+i/E=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBosH0PX+ObgCFGCgqoUrUjW902keUOxgLE8EUsB XcES2lA2qmJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCaLB9DwAKCRARpy6gFHHX ctL5D/9vpjY2JraOKI6xQLDzt9TXljIFuNDozQLvzOHyC9MgvKOWbsLqyOrunHPfrNqqKOFBK3T KwmfdS1uCAhkPVJFu9+QIjoLLd5p693JFSuHkObJvgCet04MNbRQLB5JHqL6iuH+bu9MyubXgwJ krZwBmRMnrDWPenruj6k4hAA2ihAQlUx9GOdKpiLfvYH8b6RAkHtDQPWjO21WqCLg4XFku4EESO 5IruyaJkV3MTpbYIobh2C/a6mUW8SqezSSh1LG4Bd1XobET0b8+hWmght65TmOvonC+GLe5r2Wh pLFBhM0QRVLHeqtJgYx4uIqUU9M0k9AXIOR9238ttf3Ct3ldZ9ZfTONb3jNBXOp9939T7h4ZLpx SUaPlc2TzAFEbRUJNonPEbxaaa0+qbqTjF9ltT5tZC1Mlqr8pyzA1YH8BN9wyrbK4N6qH1ty3MJ 6emE/yXMZFLsGd8hOSA+egnDYIO5BK1s91hpGWU/ZY/fadrMn6UtPYHf85JlfFzmhIlsS9nHjfY oLMcdYawGwDD/MdG1Dt9y2yWY+0T4iNxJoUqYKmpisWrARyHw/iR5VjqJFS50k88+CJMB1H36z0 letY3JTa4NNIETPLbq0dvyWaZmnqCNmCzEgKPyWyC7sxmk66PTtyQoJj32nMAH62uZVZ+A6DZeE zit65McHjdrqSGA== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski The strict flag in struct pinmux_ops disallows the usage of the same pin as a GPIO and for another function. Without it, a rouge user-space process with enough privileges (or even a buggy driver) can request a used pin as GPIO and drive it, potentially confusing devices or even crashing the system. Set it globally for all pinctrl-msm users. Reviewed-by: Konrad Dybcio Signed-off-by: Bartosz Golaszewski --- drivers/pinctrl/qcom/pinctrl-msm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinc= trl-msm.c index a5f69464827119dfe2a7781b558094b283fca215..1751d838ce95d6138c824b90098= f74891dec7656 100644 --- a/drivers/pinctrl/qcom/pinctrl-msm.c +++ b/drivers/pinctrl/qcom/pinctrl-msm.c @@ -268,6 +268,7 @@ static const struct pinmux_ops msm_pinmux_ops =3D { .function_is_gpio =3D pinmux_generic_function_is_gpio, .gpio_request_enable =3D msm_pinmux_request_gpio, .set_mux =3D msm_pinmux_set_mux, + .strict =3D true, }; =20 static int msm_config_reg(struct msm_pinctrl *pctrl, --=20 2.48.1