Messages in this thread | | | Date | Fri, 6 Oct 2023 22:50:01 +0200 | Subject | Re: [PATCH] pinctrl: samsung: Annotate struct exynos_muxed_weint_data with __counted_by | From | "Gustavo A. R. Silva" <> |
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On 10/6/23 22:17, Kees Cook wrote: > 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@gmail.com> > Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> > Cc: Sylwester Nawrocki <s.nawrocki@samsung.com> > Cc: Alim Akhtar <alim.akhtar@samsung.com> > Cc: Linus Walleij <linus.walleij@linaro.org> > Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org> > 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 <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Thanks! -- Gustavo
> --- > 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);
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