linux-hardening - Re: [PATCH] dma-buf/fence-array: Add flex array to struct dma_fence

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Message-ID: <202405181106.99C0C03BB@keescook>
Date: Sat, 18 May 2024 11:06:27 -0700
From: Kees Cook <keescook@...omium.org>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Sumit Semwal <sumit.semwal@...aro.org>,
	Gustavo Padovan <gustavo@...ovan.org>,
	Christian König <christian.koenig@....com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] dma-buf/fence-array: Add flex array to struct
 dma_fence_array

On Sat, May 18, 2024 at 07:47:02PM +0200, Christophe JAILLET wrote:
> This is an effort to get rid of all multiplications from allocation
> functions in order to prevent integer overflows [1][2].
> 
> The "struct dma_fence_array" can be refactored to add a flex array in order
> to have the "callback structures allocated behind the array" be more
> explicit.
> 
> Do so:
>    - makes the code more readable and safer.
>    - allows using __counted_by() for additional checks
>    - avoids some pointer arithmetic in dma_fence_array_enable_signaling()
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
> Link: https://github.com/KSPP/linux/issues/160 [2]
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Yes please! :)

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook