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Message-Id: <20231006201728.work.750-kees@kernel.org>
Date: Fri, 6 Oct 2023 13:17:28 -0700
From: Kees Cook <keescook@...omium.org>
To: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Kees Cook <keescook@...omium.org>,
Richard Weinberger <richard@....at>,
Vignesh Raghavendra <vigneshr@...com>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
Heiko Stuebner <heiko@...ech.de>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
Thierry Reding <treding@...dia.com>,
Roger Quadros <rogerq@...nel.org>,
Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
Cai Huoqing <cai.huoqing@...ux.dev>,
Chuanhong Guo <gch981213@...il.com>,
Rob Herring <robh@...nel.org>,
Li Zetao <lizetao1@...wei.com>,
linux-mtd@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org,
linux-hardening@...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
Subject: [PATCH] mtd: rawnand: Annotate struct mtk_nfc_nand_chip 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 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
mtk_nfc_nand_chip.
Cc: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Richard Weinberger <richard@....at>
Cc: Vignesh Raghavendra <vigneshr@...com>
Cc: Matthias Brugger <matthias.bgg@...il.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Heiko Stuebner <heiko@...ech.de>
Cc: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: Thierry Reding <treding@...dia.com>
Cc: Roger Quadros <rogerq@...nel.org>
Cc: "Uwe Kleine-König" <u.kleine-koenig@...gutronix.de>
Cc: Cai Huoqing <cai.huoqing@...ux.dev>
Cc: Chuanhong Guo <gch981213@...il.com>
Cc: Rob Herring <robh@...nel.org>
Cc: Li Zetao <lizetao1@...wei.com>
Cc: linux-mtd@...ts.infradead.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-mediatek@...ts.infradead.org
Cc: linux-hardening@...r.kernel.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/mtd/nand/raw/mtk_nand.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/raw/mtk_nand.c b/drivers/mtd/nand/raw/mtk_nand.c
index 29c8bddde67f..60198e33d2d5 100644
--- a/drivers/mtd/nand/raw/mtk_nand.c
+++ b/drivers/mtd/nand/raw/mtk_nand.c
@@ -130,7 +130,7 @@ struct mtk_nfc_nand_chip {
u32 spare_per_sector;
int nsels;
- u8 sels[];
+ u8 sels[] __counted_by(nsels);
/* nothing after this field */
};
--
2.34.1
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