Messages in this thread | | | Date | Thu, 17 Aug 2023 20:14:17 -0600 | Subject | Re: [PATCH 02/21] dmaengine: at_hdmac: Annotate struct at_desc with __counted_by | From | "Gustavo A. R. Silva" <> |
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On 8/17/23 17:58, 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 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: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Thanks -- Gustavo
> --- > drivers/dma/at_hdmac.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c > index b2876f67471f..b66c7f416881 100644 > --- a/drivers/dma/at_hdmac.c > +++ b/drivers/dma/at_hdmac.c > @@ -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); > }; > > /*-- Channels --------------------------------------------------------*/
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