linux-hardening - Re: [PATCH] driver core: platform: Annotate struct irq_affinity_devres with __counted

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Message-ID: <3c42ae53-ca2a-4b99-8010-ca70e4fbad58@embeddedor.com>
Date: Fri, 6 Oct 2023 22:46:54 +0200
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
 "Gustavo A. R. Silva" <gustavoars@...nel.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: Re: [PATCH] driver core: platform: Annotate struct
 irq_affinity_devres with __counted_by

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
> irq_affinity_devres.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.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>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks!
-- 
Gustavo

> ---
>   drivers/base/platform.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index 76bfcba25003..07216889d3ba 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -291,7 +291,7 @@ EXPORT_SYMBOL_GPL(platform_irq_count);
>   
>   struct irq_affinity_devres {
>   	unsigned int count;
> -	unsigned int irq[];
> +	unsigned int irq[] __counted_by(count);
>   };
>   
>   static void platform_disable_acpi_irq(struct platform_device *pdev, int index)