linux-kernel - [PATCH] regulator: mc13xxx: Annotate struct mc13xxx_regulator_priv with __counted

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Message-Id: <20230922175402.work.819-kees@kernel.org>
Date:   Fri, 22 Sep 2023 10:54:02 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Liam Girdwood <lgirdwood@...il.com>
Cc:     Kees Cook <keescook@...omium.org>, Mark Brown <broonie@...nel.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] regulator: mc13xxx: Annotate struct mc13xxx_regulator_priv 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 mc13xxx_regulator_priv.

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

Cc: Liam Girdwood <lgirdwood@...il.com>
Cc: Mark Brown <broonie@...nel.org>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/regulator/mc13xxx.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/mc13xxx.h b/drivers/regulator/mc13xxx.h
index e03279dc43f4..057aaef6f086 100644
--- a/drivers/regulator/mc13xxx.h
+++ b/drivers/regulator/mc13xxx.h
@@ -24,7 +24,7 @@ struct mc13xxx_regulator_priv {
 	u32 powermisc_pwgt_state;
 	struct mc13xxx_regulator *mc13xxx_regulators;
 	int num_regulators;
-	struct regulator_dev *regulators[];
+	struct regulator_dev *regulators[] __counted_by(num_regulators);
 };
 
 extern int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev,
-- 
2.34.1