| Message ID | 20230817235859.49846-21-keescook@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | dmaengine: Annotate with __counted_by | expand |
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)
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)
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> --- drivers/dma/sh/usb-dmac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)