linux-kernel - [PATCH] bus: vexpress-config: Annotate struct vexpress_syscfg_func with __counted

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Date:   Fri, 22 Sep 2023 10:52:35 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Liviu Dudau <liviu.dudau@....com>
Cc:     Kees Cook <keescook@...omium.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>, Yangtao Li <frank.li@...o.com>,
        linux-arm-kernel@...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] bus: vexpress-config: Annotate struct vexpress_syscfg_func 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 vexpress_syscfg_func.

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

Cc: Liviu Dudau <liviu.dudau@....com>
Cc: Sudeep Holla <sudeep.holla@....com>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Rob Herring <robh@...nel.org>
Cc: Yangtao Li <frank.li@...o.com>
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/bus/vexpress-config.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bus/vexpress-config.c b/drivers/bus/vexpress-config.c
index c4e1becbb2d2..d2c7ada90186 100644
--- a/drivers/bus/vexpress-config.c
+++ b/drivers/bus/vexpress-config.c
@@ -54,7 +54,7 @@ struct vexpress_syscfg_func {
 	struct vexpress_syscfg *syscfg;
 	struct regmap *regmap;
 	int num_templates;
-	u32 template[]; /* Keep it last! */
+	u32 template[] __counted_by(num_templates); /* Keep it last! */
 };
 
 struct vexpress_config_bridge_ops {
-- 
2.34.1