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Message-ID: <32b291a1-57f3-4282-eb21-f4e039f54931@embeddedor.com> Date: Wed, 4 Oct 2023 01:42:46 +0200 From: "Gustavo A. R. Silva" <gustavo@...eddedor.com> To: Kees Cook <keescook@...omium.org>, Vinod Koul <vkoul@...nel.org> Cc: dmaengine@...r.kernel.org, "Gustavo A. R. Silva" <gustavoars@...nel.org>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org, llvm@...ts.linux.dev Subject: Re: [PATCH] dmaengine: fsl-edma: Annotate struct struct fsl_edma_engine with __counted_by On 10/4/23 01:27, 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 struct fsl_edma_engine. > > Cc: Vinod Koul <vkoul@...nel.org> > Cc: dmaengine@...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/dma/fsl-edma-common.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h > index 40d50cc3d75a..bb5221158a77 100644 > --- a/drivers/dma/fsl-edma-common.h > +++ b/drivers/dma/fsl-edma-common.h > @@ -225,7 +225,7 @@ struct fsl_edma_engine { > bool big_endian; > struct edma_regs regs; > u64 chan_masked; > - struct fsl_edma_chan chans[]; > + struct fsl_edma_chan chans[] __counted_by(n_chans); > }; > > #define edma_read_tcdreg(chan, __name) \
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