linux-hardening - [PATCH] i40e: Annotate struct i40e_qvlist_info with __counted

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Date: Tue,  3 Oct 2023 16:18:38 -0700
From: Kees Cook <keescook@...omium.org>
To: Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: Kees Cook <keescook@...omium.org>,
	Shiraz Saleem <shiraz.saleem@...el.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Gurucharan G <gurucharanx.g@...el.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Tom Rix <trix@...hat.com>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH] i40e: Annotate struct i40e_qvlist_info 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 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 i40e_qvlist_info.

Cc: Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: Shiraz Saleem <shiraz.saleem@...el.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>
Cc: Gurucharan G <gurucharanx.g@...el.com>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 include/linux/net/intel/i40e_client.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/net/intel/i40e_client.h b/include/linux/net/intel/i40e_client.h
index ed42bd5f639f..0aa4411528fc 100644
--- a/include/linux/net/intel/i40e_client.h
+++ b/include/linux/net/intel/i40e_client.h
@@ -45,7 +45,7 @@ struct i40e_qv_info {
 
 struct i40e_qvlist_info {
 	u32 num_vectors;
-	struct i40e_qv_info qv_info[];
+	struct i40e_qv_info qv_info[] __counted_by(num_vectors);
 };
 
 
-- 
2.34.1