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Fri, 15 Aug 2025 02:09:17 -0700 (PDT) From: Bartosz Golaszewski Date: Fri, 15 Aug 2025 11:09:03 +0200 Subject: [PATCH v5 01/15] devres: provide devm_kmemdup_const() Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250815-pinctrl-gpio-pinfuncs-v5-1-955de9fd91db@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 X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2111; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=yGM1a+aC0va5PQYzRl7VigwSABEcy8VUGQM8wt+k8EA=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBonvk2b9jhbpZSR4bPSrpRtG6g+7NeYTvJmeHom mkeMTq5AUSJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCaJ75NgAKCRARpy6gFHHX ckzrD/9dpMT6eFmPjEdr9qjjRqAOs5l02AiDkl3dHtrzFi9yMxxW2FtEtRuxPAhpHPVWiHPN07r 0RROaKlAKF++hEfZYnZedgxj3QWia5uQqkTZGIk1C6yktsS//GQGe0diPUrRMbSsMNANL6SA3Nx S4wRM4tUkMPqKt23QdTH5TWkZhIsNDbuDR8Zj4iNO/Oe9tiVLXFbPOslY91hsYRIOx+29AVkUu0 nfRh3+Be+5nBAQc73pr8bf0gR8TwhJtXlQ4oMq6OGzCUWMZs0cTeSGFiQdzL6oP9De/SWcMCMPO 3XA0BNI12lUneQ4UuYedE1N0KElf76XPTEx2UrholVQN+5KpqruqPKypec/HgHGhpMQv0ywBWUO kkjEJiumlJd7SzYJ+Cl7t9foAdOHlVGbHrSwhNNAsZ6NP4umioBGxWb3qFwna55mgCL1R1YynSo KPOx6RPkda84XsjOzlOwSqAPBufV3AON+YIKuJBUmKqGk5ba2nja9OqTYjlQEHBOeN2QmF05iUK z+4I82/CtLqSGznLLQbzoJu3sRwnPRgEc1iZEg8oYC/4IqFC6/noCf4YYYvIA7C03q+RTCyPCRn z465BIQ5H0TfkwTOj4sYbbMsTcq7N2mrfE+fqMp4J4jUxTAhjOXedXvSYOIXvvmYPQxWMphF+EQ nh1EvmLIpVJ9QHA== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski Provide a function similar to devm_strdup_const() but for copying blocks of memory that are likely to be placed in .rodata. Reviewed-by: Andy Shevchenko Signed-off-by: Bartosz Golaszewski --- drivers/base/devres.c | 21 +++++++++++++++++++++ include/linux/device/devres.h | 2 ++ 2 files changed, 23 insertions(+) diff --git a/drivers/base/devres.c b/drivers/base/devres.c index ff55e1bcfa30057849a352c577bd32f1aa196532..c948c88d395607ff511ffa6eb0a75b7847ab9239 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -1117,6 +1117,27 @@ void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp) } EXPORT_SYMBOL_GPL(devm_kmemdup); +/** + * devm_kmemdup_const - conditionally duplicate and manage a region of memory + * + * @dev: Device this memory belongs to + * @src: memory region to duplicate + * @len: memory region length, + * @gfp: GFP mask to use + * + * Return: source address if it is in .rodata or the return value of kmemdup() + * to which the function falls back otherwise. + */ +const void * +devm_kmemdup_const(struct device *dev, const void *src, size_t len, gfp_t gfp) +{ + if (is_kernel_rodata((unsigned long)src)) + return src; + + return devm_kmemdup(dev, src, len, gfp); +} +EXPORT_SYMBOL_GPL(devm_kmemdup_const); + struct pages_devres { unsigned long addr; unsigned int order; diff --git a/include/linux/device/devres.h b/include/linux/device/devres.h index ae696d10faff4468a41f37b5d5fd679d4ff11997..8c5f57e0d613492fd0b2ec97dd384181608192fc 100644 --- a/include/linux/device/devres.h +++ b/include/linux/device/devres.h @@ -80,6 +80,8 @@ void devm_kfree(struct device *dev, const void *p); void * __realloc_size(3) devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp); +const void * +devm_kmemdup_const(struct device *dev, const void *src, size_t len, gfp_t gfp); static inline void *devm_kmemdup_array(struct device *dev, const void *src, size_t n, size_t size, gfp_t flags) { -- 2.48.1