| Message ID | 20230817235859.49846-15-keescook@chromium.org |
|---|---|
| State | Accepted |
| Commit | 32b5e2d7cd14c80de1fa1cdffcc6ec211b615d82 |
| 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 tegra_dma_desc. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Vinod Koul <vkoul@kernel.org> > Cc: Laxman Dewangan <ldewangan@nvidia.com> > Cc: Jon Hunter <jonathanh@nvidia.com> > Cc: Thierry Reding <thierry.reding@gmail.com> > Cc: dmaengine@vger.kernel.org > Cc: linux-tegra@vger.kernel.org > Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Thanks -- Gustavo > --- > drivers/dma/tegra186-gpc-dma.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dma/tegra186-gpc-dma.c b/drivers/dma/tegra186-gpc-dma.c > index 33b101001100..5e3d5f5d1e20 100644 > --- a/drivers/dma/tegra186-gpc-dma.c > +++ b/drivers/dma/tegra186-gpc-dma.c > @@ -221,7 +221,7 @@ struct tegra_dma_desc { > unsigned int sg_count; > struct virt_dma_desc vd; > struct tegra_dma_channel *tdc; > - struct tegra_dma_sg_req sg_req[]; > + struct tegra_dma_sg_req sg_req[] __counted_by(sg_count); > }; > > /*
diff --git a/drivers/dma/tegra186-gpc-dma.c b/drivers/dma/tegra186-gpc-dma.c index 33b101001100..5e3d5f5d1e20 100644 --- a/drivers/dma/tegra186-gpc-dma.c +++ b/drivers/dma/tegra186-gpc-dma.c @@ -221,7 +221,7 @@ struct tegra_dma_desc { unsigned int sg_count; struct virt_dma_desc vd; struct tegra_dma_channel *tdc; - struct tegra_dma_sg_req sg_req[]; + struct tegra_dma_sg_req sg_req[] __counted_by(sg_count); }; /*
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 tegra_dma_desc. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Vinod Koul <vkoul@kernel.org> Cc: Laxman Dewangan <ldewangan@nvidia.com> Cc: Jon Hunter <jonathanh@nvidia.com> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: dmaengine@vger.kernel.org Cc: linux-tegra@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> --- drivers/dma/tegra186-gpc-dma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)