| Message ID | 20230817235859.49846-20-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 uniphier_xdmac_device. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Vinod Koul <vkoul@kernel.org> > Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> > Cc: Masami Hiramatsu <mhiramat@kernel.org> > Cc: dmaengine@vger.kernel.org > Cc: linux-arm-kernel@lists.infradead.org > Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Thanks -- Gustavo > --- > drivers/dma/uniphier-xdmac.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dma/uniphier-xdmac.c b/drivers/dma/uniphier-xdmac.c > index dd51522879a7..3a8ee2b173b5 100644 > --- a/drivers/dma/uniphier-xdmac.c > +++ b/drivers/dma/uniphier-xdmac.c > @@ -97,7 +97,7 @@ struct uniphier_xdmac_device { > struct dma_device ddev; > void __iomem *reg_base; > int nr_chans; > - struct uniphier_xdmac_chan channels[]; > + struct uniphier_xdmac_chan channels[] __counted_by(nr_chans); > }; > > static struct uniphier_xdmac_chan *
diff --git a/drivers/dma/uniphier-xdmac.c b/drivers/dma/uniphier-xdmac.c index dd51522879a7..3a8ee2b173b5 100644 --- a/drivers/dma/uniphier-xdmac.c +++ b/drivers/dma/uniphier-xdmac.c @@ -97,7 +97,7 @@ struct uniphier_xdmac_device { struct dma_device ddev; void __iomem *reg_base; int nr_chans; - struct uniphier_xdmac_chan channels[]; + struct uniphier_xdmac_chan channels[] __counted_by(nr_chans); }; static struct uniphier_xdmac_chan *
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 uniphier_xdmac_device. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Vinod Koul <vkoul@kernel.org> Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: dmaengine@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Kees Cook <keescook@chromium.org> --- drivers/dma/uniphier-xdmac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)