| Message ID | 20230817235859.49846-16-keescook@chromium.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| 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_adma. > > [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/tegra210-adma.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c > index e557bada1510..cea33912a4c9 100644 > --- a/drivers/dma/tegra210-adma.c > +++ b/drivers/dma/tegra210-adma.c > @@ -162,7 +162,7 @@ struct tegra_adma { > const struct tegra_adma_chip_data *cdata; > > /* Last member of the structure */ > - struct tegra_adma_chan channels[]; > + struct tegra_adma_chan channels[] __counted_by(nr_channels); > }; > > static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val)
diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c index e557bada1510..cea33912a4c9 100644 --- a/drivers/dma/tegra210-adma.c +++ b/drivers/dma/tegra210-adma.c @@ -162,7 +162,7 @@ struct tegra_adma { const struct tegra_adma_chip_data *cdata; /* Last member of the structure */ - struct tegra_adma_chan channels[]; + struct tegra_adma_chan channels[] __counted_by(nr_channels); }; static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val)
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_adma. [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/tegra210-adma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)