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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id 15-20020aa7914f000000b00692c5b1a731sm1875791pfi.186.2023.10.06.13.17.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Oct 2023 13:17:09 -0700 (PDT) From: Kees Cook To: Tomasz Figa Cc: Kees Cook , Krzysztof Kozlowski , Sylwester Nawrocki , Alim Akhtar , Linus Walleij , "Gustavo A. R. Silva" , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-gpio@vger.kernel.org, linux-hardening@vger.kernel.org, Nathan Chancellor , Nick Desaulniers , Tom Rix , linux-kernel@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH] pinctrl: samsung: Annotate struct exynos_muxed_weint_data with __counted_by Date: Fri, 6 Oct 2023 13:17:07 -0700 Message-Id: <20231006201707.work.405-kees@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2568; i=keescook@chromium.org; h=from:subject:message-id; bh=lsTbTj1Qtp6GgXJHYDIN0GpRbyjpp/e7Ct6QQbjSy0Q=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlIGtDy9BWBe1i4kwKNKaTCXh1WjWe/M2wbybFm RGQGh5dTv+JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZSBrQwAKCRCJcvTf3G3A JkxPEACXFEGhNrvxBkTKUfgVjkyDrnxC4WfPJdhQxqmOPOzyY7EPwkDCEoiad2SUhfNal9NNCX2 YG6o8XD/Uh2tW7jyIlkOfT6uBfN7mpF6v8hCUD+fj68+miZhqVOIS/HHe0lZoS+pIPABq9VOexQ jjhxKYKoT8/9zXbQpD73TUCh9JHPIVlA3/ogT3ZoqWFJxtyNsuR//kYxSK3cTmx7KTH2cjdhNfE FOVAGIaap8Ql40LUwC7YnOL3GgFklirZ49tih0ydJ92l/cBHsNFOneuAL9sAORZPXrC9U3zx2wl 5PwxcY6gIE6Qt+/crsR7qoAO5VwSQGiDcgv/NfhyFZ8WIeDnffMI47fj8qHurqCTH2to25FGThw Wae7K4YrpBU7BQ1VjmJpSAT3vTjH/7gsV1m6n93iTXw6A+M8li7P5V1kpw1VTdyRmEvikJfo5SL HIJ89R8z5r9OZLteo3msJf6liREQIfgVYXvyAFMP5F/MRQO2jV2nRG9V9Q9epbB6SdpTjzxiO3Q 971qa3ROTD5xraPe3iEYKh/b5jWN9fzoYD4WWl+ptluj6FTIhL0MqsPBkRwH2EkTIYRsncnJZd+ Yrf3FjEvpL7AzCI34QOyMBEeP2ttb4NVoGGAQWWt5I97UEdH5QyqDsOL/vI8bR3Oj3ccd8l77Eq 6vqzydT cWFqXEJQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct exynos_muxed_weint_data. Additionally, since the element count member must be set before accessing the annotated flexible array member, move its initialization earlier. Cc: Tomasz Figa Cc: Krzysztof Kozlowski Cc: Sylwester Nawrocki Cc: Alim Akhtar Cc: Linus Walleij Cc: "Gustavo A. R. Silva" Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-gpio@vger.kernel.org Cc: linux-hardening@vger.kernel.org Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva --- drivers/pinctrl/samsung/pinctrl-exynos.c | 2 +- drivers/pinctrl/samsung/pinctrl-exynos.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pinctrl/samsung/pinctrl-exynos.c b/drivers/pinctrl/samsung/pinctrl-exynos.c index a8212fc126bf..6b58ec84e34b 100644 --- a/drivers/pinctrl/samsung/pinctrl-exynos.c +++ b/drivers/pinctrl/samsung/pinctrl-exynos.c @@ -616,6 +616,7 @@ __init int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d) + muxed_banks*sizeof(struct samsung_pin_bank *), GFP_KERNEL); if (!muxed_data) return -ENOMEM; + muxed_data->nr_banks = muxed_banks; irq_set_chained_handler_and_data(irq, exynos_irq_demux_eint16_31, muxed_data); @@ -628,7 +629,6 @@ __init int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d) muxed_data->banks[idx++] = bank; } - muxed_data->nr_banks = muxed_banks; return 0; } diff --git a/drivers/pinctrl/samsung/pinctrl-exynos.h b/drivers/pinctrl/samsung/pinctrl-exynos.h index 7bd6d82c9f36..3ac52c2cf998 100644 --- a/drivers/pinctrl/samsung/pinctrl-exynos.h +++ b/drivers/pinctrl/samsung/pinctrl-exynos.h @@ -159,7 +159,7 @@ struct exynos_weint_data { */ struct exynos_muxed_weint_data { unsigned int nr_banks; - struct samsung_pin_bank *banks[]; + struct samsung_pin_bank *banks[] __counted_by(nr_banks); }; int exynos_eint_gpio_init(struct samsung_pinctrl_drv_data *d);