linux-hardening - [PATCH] spi: mchp-pci1xxxx: Annotate struct pci1xxxx_spi with __counted

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Message-Id: <20230922175322.work.170-kees@kernel.org>
Date: Fri, 22 Sep 2023 10:53:23 -0700
From: Kees Cook <keescook@...omium.org>
To: Mark Brown <broonie@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
	linux-spi@...r.kernel.org,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Tom Rix <trix@...hat.com>,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev,
	linux-hardening@...r.kernel.org
Subject: [PATCH] spi: mchp-pci1xxxx: Annotate struct pci1xxxx_spi with __counted_by

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 pci1xxxx_spi.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Mark Brown <broonie@...nel.org>
Cc: linux-spi@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/spi/spi-pci1xxxx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-pci1xxxx.c b/drivers/spi/spi-pci1xxxx.c
index 3638e974f5d4..5b2d3e4e21b7 100644
--- a/drivers/spi/spi-pci1xxxx.c
+++ b/drivers/spi/spi-pci1xxxx.c
@@ -77,7 +77,7 @@ struct pci1xxxx_spi {
 	struct pci_dev *dev;
 	u8 total_hw_instances;
 	void __iomem *reg_base;
-	struct pci1xxxx_spi_internal *spi_int[];
+	struct pci1xxxx_spi_internal *spi_int[] __counted_by(total_hw_instances);
 };
 
 static const struct pci_device_id pci1xxxx_spi_pci_id_table[] = {
-- 
2.34.1