linux-kernel - [PATCH] i3c: master: cdns: Annotate struct cdns_i3c_xfer with __counted

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Message-Id: <20230922175014.work.637-kees@kernel.org>
Date:   Fri, 22 Sep 2023 10:50:15 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Przemysław Gaj <pgaj@...ence.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-i3c@...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] i3c: master: cdns: Annotate struct cdns_i3c_xfer 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 cdns_i3c_xfer.

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

Cc: "Przemysław Gaj" <pgaj@...ence.com>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: linux-i3c@...ts.infradead.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/i3c/master/i3c-master-cdns.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i3c/master/i3c-master-cdns.c b/drivers/i3c/master/i3c-master-cdns.c
index 49551db71bc9..97c1010956a0 100644
--- a/drivers/i3c/master/i3c-master-cdns.c
+++ b/drivers/i3c/master/i3c-master-cdns.c
@@ -387,7 +387,7 @@ struct cdns_i3c_xfer {
 	struct completion comp;
 	int ret;
 	unsigned int ncmds;
-	struct cdns_i3c_cmd cmds[];
+	struct cdns_i3c_cmd cmds[] __counted_by(ncmds);
 };
 
 struct cdns_i3c_data {
-- 
2.34.1