linux-kernel - [PATCH] mtd: rawnand: ingenic: Annotate struct ingenic_nfc with __counted

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Date:   Fri, 15 Sep 2023 13:12:35 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Kees Cook <keescook@...omium.org>,
        Harvey Hunt <harveyhuntnexus@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mips@...r.kernel.org, linux-mtd@...ts.infradead.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] mtd: rawnand: ingenic: Annotate struct ingenic_nfc 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 ingenic_nfc.

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

Cc: Paul Cercueil <paul@...pouillou.net>
Cc: Harvey Hunt <harveyhuntnexus@...il.com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Richard Weinberger <richard@....at>
Cc: Vignesh Raghavendra <vigneshr@...com>
Cc: linux-mips@...r.kernel.org
Cc: linux-mtd@...ts.infradead.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/mtd/nand/raw/ingenic/ingenic_nand_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/ingenic/ingenic_nand_drv.c b/drivers/mtd/nand/raw/ingenic/ingenic_nand_drv.c
index 6748226b8bd1..ce9ef4e65597 100644
--- a/drivers/mtd/nand/raw/ingenic/ingenic_nand_drv.c
+++ b/drivers/mtd/nand/raw/ingenic/ingenic_nand_drv.c
@@ -46,7 +46,7 @@ struct ingenic_nfc {
 	struct nand_controller controller;
 	unsigned int num_banks;
 	struct list_head chips;
-	struct ingenic_nand_cs cs[];
+	struct ingenic_nand_cs cs[] __counted_by(num_banks);
 };
 
 struct ingenic_nand {
-- 
2.34.1