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Message-Id: <20231006201707.work.405-kees@kernel.org> Date: Fri, 6 Oct 2023 13:17:07 -0700 From: Kees Cook <keescook@...omium.org> To: Tomasz Figa <tomasz.figa@...il.com> Cc: Kees Cook <keescook@...omium.org>, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, Sylwester Nawrocki <s.nawrocki@...sung.com>, Alim Akhtar <alim.akhtar@...sung.com>, Linus Walleij <linus.walleij@...aro.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>, linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, linux-gpio@...r.kernel.org, linux-hardening@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org, llvm@...ts.linux.dev Subject: [PATCH] pinctrl: samsung: Annotate struct exynos_muxed_weint_data with __counted_by 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 <tomasz.figa@...il.com> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> Cc: Sylwester Nawrocki <s.nawrocki@...sung.com> Cc: Alim Akhtar <alim.akhtar@...sung.com> Cc: Linus Walleij <linus.walleij@...aro.org> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org> Cc: linux-arm-kernel@...ts.infradead.org Cc: linux-samsung-soc@...r.kernel.org Cc: linux-gpio@...r.kernel.org Cc: linux-hardening@...r.kernel.org Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook <keescook@...omium.org> --- 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); -- 2.34.1
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