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Thu, 24 Jul 2025 02:25:02 -0700 (PDT) From: Bartosz Golaszewski Date: Thu, 24 Jul 2025 11:24:43 +0200 Subject: [PATCH v3 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: <20250724-pinctrl-gpio-pinfuncs-v3-15-af4db9302de4@linaro.org> References: <20250724-pinctrl-gpio-pinfuncs-v3-0-af4db9302de4@linaro.org> In-Reply-To: <20250724-pinctrl-gpio-pinfuncs-v3-0-af4db9302de4@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 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=M36QPREHYk2Y1Ol3wL/sT7z2U9JVD+MimNp7WJSOHU0=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBogfvUuNqnvhBaTQ7E02dLbZ93XPdMix/+wojXR G62efWlN2eJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCaIH71AAKCRARpy6gFHHX csIEEACcYzcalCunEHwwLc8fC351P1QZ0/EviGqXfAPEAKDWr3P+rwFdN2Ta12zzVjBkLzjyQ91 Zv3Pyd8ByzwdIUsKqqnTCqQXU561HpvlpivEPwqQfk2Fv1/z8zXTLdhqLYeWc2DtYwXVL47+ep1 hvPNS0sKjxZZSbhD2Cv0so7lDbU9TIvO8FfROCo+OUmJ+fNRIHwJdm3DZ3UCBbKrfqj0JKqwStC SmdBFpZg+RC6pqBdqVp2puRBkrX4kkPXma3WhGUgbQa/jdRrzeKTzhOecZSN78aF+JYuAOuEWas 9ZYmbC12bDFImUccK4LcZfdm6UKPE66KoyCTfbJSdLsUaafuNUop1v3HMU+T1Qr/Xjdxcfc1d72 xDxNII3sKlNkkl6WGjDNi7bqM437VkY4D3MqKo2PdUpL8pWVacs90dpKk/TeHcMZqMlSPpWf6Ir w0BoC8kdAtDjE9Xmx8h4NgBJrMuqyRB+w2H/MkSVj85rAH3A8nrxlRd/vqL77bGkehXfVeY7coP hWnYxxxDdbXZTNWgEpW4pWcbFrtw2pyKmva81FwQzEbINBVc2nQJQb2Qpd68J7/3170a6GFWyeN MElcFiUfHMZhzI5U6MPEUSceL4b9e10SrngoFXdrORgydvHqnRID4/lq5Qv8dryavy2pK7C0AN1 RovE1kMQsSfBwRA== 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 7010be8d1ace062fcf7743e539d2065d4aed856b..ad572c923e2ab8caed134207ec0= 2c4107d4dc2bd 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