| Message ID | 20230817235859.49846-4-keescook@chromium.org |
|---|---|
| State | New |
| 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 fsl_edma_desc. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Vinod Koul <vkoul@kernel.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/fsl-edma-common.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h > index 004ec4a6bc86..fdbc79787643 100644 > --- a/drivers/dma/fsl-edma-common.h > +++ b/drivers/dma/fsl-edma-common.h > @@ -135,7 +135,7 @@ struct fsl_edma_desc { > bool iscyclic; > enum dma_transfer_direction dirn; > unsigned int n_tcds; > - struct fsl_edma_sw_tcd tcd[]; > + struct fsl_edma_sw_tcd tcd[] __counted_by(n_tcds); > }; > > enum edma_version {
diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h index 004ec4a6bc86..fdbc79787643 100644 --- a/drivers/dma/fsl-edma-common.h +++ b/drivers/dma/fsl-edma-common.h @@ -135,7 +135,7 @@ struct fsl_edma_desc { bool iscyclic; enum dma_transfer_direction dirn; unsigned int n_tcds; - struct fsl_edma_sw_tcd tcd[]; + struct fsl_edma_sw_tcd tcd[] __counted_by(n_tcds); }; enum edma_version {
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 fsl_edma_desc. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Vinod Koul <vkoul@kernel.org> Cc: dmaengine@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> --- drivers/dma/fsl-edma-common.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)