Messages in this thread | | | Date | Thu, 17 Aug 2023 20:17:45 -0600 | Subject | Re: [PATCH 21/21] dmaengine: usb-dmac: Annotate struct usb_dmac_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 usb_dmac_desc. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Vinod Koul <vkoul@kernel.org> > Cc: Yu Kuai <yukuai3@huawei.com> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > Cc: Jordy Zomer <jordy@pwning.systems> > Cc: Jernej Skrabec <jernej.skrabec@gmail.com> > Cc: Tudor Ambarus <tudor.ambarus@linaro.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/sh/usb-dmac.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dma/sh/usb-dmac.c b/drivers/dma/sh/usb-dmac.c > index b14cf350b669..4cfcd23e3268 100644 > --- a/drivers/dma/sh/usb-dmac.c > +++ b/drivers/dma/sh/usb-dmac.c > @@ -57,7 +57,7 @@ struct usb_dmac_desc { > u32 residue; > struct list_head node; > dma_cookie_t done_cookie; > - struct usb_dmac_sg sg[]; > + struct usb_dmac_sg sg[] __counted_by(sg_allocated_len); > }; > > #define to_usb_dmac_desc(vd) container_of(vd, struct usb_dmac_desc, vd)
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