Commit 81cd3cb3 authored by Kees Cook's avatar Kees Cook Committed by Vinod Koul
Browse files

dmaengine: at_hdmac: Annotate struct at_desc 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 checking 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 at_desc.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci



Cc: Vinod Koul <vkoul@kernel.org>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: Tudor Ambarus <tudor.ambarus@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: dmaengine@vger.kernel.org
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Reviewed-by: default avatarTudor Ambarus <tudor.ambarus@linaro.org>
Reviewed-by: default avatar"Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230817235859.49846-2-keescook@chromium.org


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 83c5d35b

drivers/dma/at_hdmac.c

+1 −1
Original line number Diff line number Diff line
@@ -239,7 +239,7 @@ struct at_desc { 
	bool				memset_buffer;

	dma_addr_t			memset_paddr;

	int				*memset_vaddr;

	struct atdma_sg			sg[];

	struct atdma_sg			sg[] __counted_by(sglen);

};



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