linux-hardening - [PATCH] mtd: rawnand: sunxi: Annotate struct sunxi_nand_chip with __counted

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Date:   Fri, 15 Sep 2023 13:13:01 -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>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Manuel Dipolt <mdipolt@...art.cc>,
        linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Heiko Stuebner <heiko@...ech.de>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Rob Herring <robh@...nel.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Yangtao Li <frank.li@...o.com>,
        Li Zetao <lizetao1@...wei.com>, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: [PATCH] mtd: rawnand: sunxi: Annotate struct sunxi_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 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 sunxi_nand_chip.

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

Cc: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Richard Weinberger <richard@....at>
Cc: Vignesh Raghavendra <vigneshr@...com>
Cc: Chen-Yu Tsai <wens@...e.org>
Cc: Jernej Skrabec <jernej.skrabec@...il.com>
Cc: Samuel Holland <samuel@...lland.org>
Cc: Manuel Dipolt <mdipolt@...art.cc>
Cc: linux-mtd@...ts.infradead.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-sunxi@...ts.linux.dev
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/mtd/nand/raw/sunxi_nand.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c
index 9abf38049d35..4ec17c8bce5a 100644
--- a/drivers/mtd/nand/raw/sunxi_nand.c
+++ b/drivers/mtd/nand/raw/sunxi_nand.c
@@ -197,7 +197,7 @@ struct sunxi_nand_chip {
 	u32 timing_cfg;
 	u32 timing_ctl;
 	int nsels;
-	struct sunxi_nand_chip_sel sels[];
+	struct sunxi_nand_chip_sel sels[] __counted_by(nsels);
 };
 
 static inline struct sunxi_nand_chip *to_sunxi_nand(struct nand_chip *nand)
-- 
2.34.1