linux-kernel - [PATCH] mailbox: zynqmp: Annotate struct zynqmp_ipi_pdata with __counted

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Message-Id: <20230922175351.work.018-kees@kernel.org>
Date:   Fri, 22 Sep 2023 10:53:51 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jassi Brar <jassisinghbrar@...il.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Michal Simek <michal.simek@....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] mailbox: zynqmp: Annotate struct zynqmp_ipi_pdata 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 zynqmp_ipi_pdata.

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

Cc: Jassi Brar <jassisinghbrar@...il.com>
Cc: Michal Simek <michal.simek@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/mailbox/zynqmp-ipi-mailbox.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c
index e4fcac97dbfa..7fa533e80dd9 100644
--- a/drivers/mailbox/zynqmp-ipi-mailbox.c
+++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
@@ -108,7 +108,7 @@ struct zynqmp_ipi_pdata {
 	unsigned int method;
 	u32 local_id;
 	int num_mboxes;
-	struct zynqmp_ipi_mbox ipi_mboxes[];
+	struct zynqmp_ipi_mbox ipi_mboxes[] __counted_by(num_mboxes);
 };
 
 static struct device_driver zynqmp_ipi_mbox_driver = {
-- 
2.34.1