[PATCH 02/21] dmaengine: at_hdmac: Annotate struct at_desc with __counted_by
Kees Cook
keescook at chromium.org
Thu Aug 17 16:58:39 PDT 2023
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 at_desc.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Vinod Koul <vkoul at kernel.org>
Cc: Ludovic Desroches <ludovic.desroches at microchip.com>
Cc: Tudor Ambarus <tudor.ambarus at linaro.org>
Cc: linux-arm-kernel at lists.infradead.org
Cc: dmaengine at vger.kernel.org
Signed-off-by: Kees Cook <keescook at chromium.org>
---
drivers/dma/at_hdmac.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index b2876f67471f..b66c7f416881 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -239,7 +239,7 @@ struct at_desc {
bool memset_buffer;
dma_addr_t memset_paddr;
int *memset_vaddr;
- struct atdma_sg sg[];
+ struct atdma_sg sg[] __counted_by(sglen);
};
/*-- Channels --------------------------------------------------------*/
--
2.34.1
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