linux-kernel - Re: [PATCH] pinctrl: airoha: Use unsigned long for bit search

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Message-ID: <CACRpkdaBErgRrFDWu2FSrnX9Hr=PnHvfccLgAzhOOwTdXuRjTg@mail.gmail.com>
Date: Mon, 18 Nov 2024 23:58:09 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Kees Cook <kees@...nel.org>
Cc: Lorenzo Bianconi <lorenzo@...nel.org>, Sean Wang <sean.wang@...nel.org>, 
	linux-mediatek@...ts.infradead.org, linux-gpio@...r.kernel.org, 
	Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] pinctrl: airoha: Use unsigned long for bit search

On Sun, Nov 17, 2024 at 12:45 PM Kees Cook <kees@...nel.org> wrote:

> Instead of risking alignment problems and causing (false positive) array
> bound warnings when casting a u32 to (64-bit) unsigned long, just use a
> native unsigned long for doing bit searches. Avoids warning with GCC 15's
> -Warray-bounds -fdiagnostics-details:
>
> In file included from ../include/linux/bitmap.h:11,
>                  from ../include/linux/cpumask.h:12,
>                  from ../arch/x86/include/asm/paravirt.h:21,
>                  from ../arch/x86/include/asm/irqflags.h:80,
>                  from ../include/linux/irqflags.h:18,
>                  from ../include/linux/spinlock.h:59,
>                  from ../include/linux/irq.h:14,
>                  from ../include/linux/irqchip/chained_irq.h:10,
>                  from ../include/linux/gpio/driver.h:8,
>                  from ../drivers/pinctrl/mediatek/pinctrl-airoha.c:11:
> In function 'find_next_bit',
>     inlined from 'airoha_irq_handler' at ../drivers/pinctrl/mediatek/pinctrl-airoha.c:2394:3:
> ../include/linux/find.h:65:23: error: array subscript 'long unsigned int[0]' is partly outside array bounds of 'u32[1]' {aka 'unsigned int[1]'} [-Werror=array-bounds=]
>    65 |                 val = *addr & GENMASK(size - 1, offset);
>       |                       ^~~~~
> ../drivers/pinctrl/mediatek/pinctrl-airoha.c: In function 'airoha_irq_handler':
> ../drivers/pinctrl/mediatek/pinctrl-airoha.c:2387:21: note: object 'status' of size 4
>  2387 |                 u32 status;
>       |                     ^~~~~~
>
> Signed-off-by: Kees Cook <kees@...nel.org>

Patch applied, thanks Kees!

Yours,
Linus Walleij