linux-hardening - [PATCH] gpiolib: cdev: Annotate struct linereq with __counted

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Date: Fri, 22 Sep 2023 10:52:03 -0700
From: Kees Cook <keescook@...omium.org>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Kees Cook <keescook@...omium.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Andy Shevchenko <andy@...nel.org>,
	linux-gpio@...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,
	linux-hardening@...r.kernel.org
Subject: [PATCH] gpiolib: cdev: Annotate struct linereq 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 linereq.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.

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

Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Andy Shevchenko <andy@...nel.org>
Cc: linux-gpio@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/gpio/gpiolib-cdev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index e39d344feb28..31fc71a612c2 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -572,7 +572,7 @@ struct linereq {
 	DECLARE_KFIFO_PTR(events, struct gpio_v2_line_event);
 	atomic_t seqno;
 	struct mutex config_mutex;
-	struct line lines[];
+	struct line lines[] __counted_by(num_lines);
 };
 
 #define GPIO_V2_LINE_BIAS_FLAGS \
@@ -1656,6 +1656,7 @@ static int linereq_create(struct gpio_device *gdev, void __user *ip)
 	lr = kzalloc(struct_size(lr, lines, ulr.num_lines), GFP_KERNEL);
 	if (!lr)
 		return -ENOMEM;
+	lr->num_lines = ulr.num_lines;
 
 	lr->gdev = gpio_device_get(gdev);
 
@@ -1684,7 +1685,6 @@ static int linereq_create(struct gpio_device *gdev, void __user *ip)
 		lr->event_buffer_size = GPIO_V2_LINES_MAX * 16;
 
 	atomic_set(&lr->seqno, 0);
-	lr->num_lines = ulr.num_lines;
 
 	/* Request each GPIO */
 	for (i = 0; i < ulr.num_lines; i++) {
-- 
2.34.1