linux-hardening - [PATCH] nvmet-fc: Annotate struct nvmet_fc_tgt_queue with __counted

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Date: Tue,  3 Oct 2023 16:25:11 -0700
From: Kees Cook <keescook@...omium.org>
To: James Smart <james.smart@...adcom.com>
Cc: Kees Cook <keescook@...omium.org>,
	Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Chaitanya Kulkarni <kch@...dia.com>,
	linux-nvme@...ts.infradead.org,
	"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] nvmet-fc: Annotate struct nvmet_fc_tgt_queue 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 nvmet_fc_tgt_queue.

Cc: James Smart <james.smart@...adcom.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Sagi Grimberg <sagi@...mberg.me>
Cc: Chaitanya Kulkarni <kch@...dia.com>
Cc: linux-nvme@...ts.infradead.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/nvme/target/fc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index 1ab6601fdd5c..0fa2d658cdeb 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -146,7 +146,7 @@ struct nvmet_fc_tgt_queue {
 	struct workqueue_struct		*work_q;
 	struct kref			ref;
 	struct rcu_head			rcu;
-	struct nvmet_fc_fcp_iod		fod[];		/* array of fcp_iods */
+	struct nvmet_fc_fcp_iod		fod[] __counted_by(sqsize); /* array of fcp_iods */
 } __aligned(sizeof(unsigned long long));
 
 struct nvmet_fc_hostport {
-- 
2.34.1