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Fri, 15 Aug 2025 02:09:40 -0700 (PDT) From: Bartosz Golaszewski Date: Fri, 15 Aug 2025 11:09:17 +0200 Subject: [PATCH v5 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: <20250815-pinctrl-gpio-pinfuncs-v5-15-955de9fd91db@linaro.org> References: <20250815-pinctrl-gpio-pinfuncs-v5-0-955de9fd91db@linaro.org> In-Reply-To: <20250815-pinctrl-gpio-pinfuncs-v5-0-955de9fd91db@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 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/ZANAwAKARGnLqAUcddyAcsmYgBonvk6E0B63uoFwvdNfdM6shEMGyPseEvOlsf0/ xE/Q7RcUMmJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCaJ75OgAKCRARpy6gFHHX cgUiEADKwU+j0rwTCMMo4gp+q9WJ8f3aBc4TC+eTJd7Rb68K/vvR8mQoOObnc5vYp4f1bGS5hjx nhb+kFiHt9322cnLeohSt3ZOFPCzHPEj2QRLHCoHJ/Z//LaWVcxvSNu/k5B0wuFON9igEj3HZnu cpu9eGKkr2mIAfESMNu2yXlUPQB5vXtiZ9y0GkHRefEdE18uLI39sKYfWLR/ZeMGcUUp86JjYUr 2BJ39RDdZCMbvLjh8df1T6RwANJSK2q7RbAnM1uvo7hUhvPnQYiTe8yo4a3aELWbv/TVbD9jT8K ZXGeUzH85xQKEQ0JTjzReXrxA748Oyq3uLoLuL1GzHqTkRiMnu18+BBTvaCr3u4TB8SVgkbF6Ls AUXyGIRAk5hGTn6lf6aeYN+NrvwvlvPtCtdN8ZTpi6p4GT0PfS0o1QOMVO8X0DrcDLo6nilrVyp GKZ4vywviTy/wxChO1vznkIdtfA5ylI00rp9tKrccz4rpnda311StQvjVC9o1Py9DeKtv0cGGh9 SJ4Mcj0suKefpRxOr8UWj05HldOdGpacP8CC7eTEE6LPapXVPDfkem2wLu4/01B+kl8N2cVPOdn io4s9PHmIyv1eMTsFNfIOUPPLb+j7PMBFXlGzqUadBKgYD6NcwP8wBOIeXNI5r7bkDQb8eF19oG qT+jLfULiytDlBw== 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