linux-hardening - [PATCH] firewire: Annotate struct fw_node with __counted

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Date: Fri, 22 Sep 2023 10:53:35 -0700
From: Kees Cook <keescook@...omium.org>
To: Takashi Sakamoto <o-takashi@...amocchi.jp>
Cc: Kees Cook <keescook@...omium.org>,
	linux1394-devel@...ts.sourceforge.net,
	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] firewire: Annotate struct fw_node 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 fw_node.

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

Cc: Takashi Sakamoto <o-takashi@...amocchi.jp>
Cc: linux1394-devel@...ts.sourceforge.net
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/firewire/core.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h
index 2a05f411328f..95c10f3d2282 100644
--- a/drivers/firewire/core.h
+++ b/drivers/firewire/core.h
@@ -191,7 +191,7 @@ struct fw_node {
 	/* Upper layer specific data. */
 	void *data;
 
-	struct fw_node *ports[];
+	struct fw_node *ports[] __counted_by(port_count);
 };
 
 static inline struct fw_node *fw_node_get(struct fw_node *node)
-- 
2.34.1