linux-hardening - [PATCH] dm: Annotate struct stripe_c with __counted

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Date:   Fri, 15 Sep 2023 13:03:53 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Alasdair Kergon <agk@...hat.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Mike Snitzer <snitzer@...nel.org>, dm-devel@...hat.com,
        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] dm: Annotate struct stripe_c 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 stripe_c.

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

Cc: Alasdair Kergon <agk@...hat.com>
Cc: Mike Snitzer <snitzer@...nel.org>
Cc: dm-devel@...hat.com
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/md/dm-stripe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index e2854a3cbd28..5e70f5ae394d 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -44,7 +44,7 @@ struct stripe_c {
 	/* Work struct used for triggering events*/
 	struct work_struct trigger_event;
 
-	struct stripe stripe[];
+	struct stripe stripe[] __counted_by(stripes);
 };
 
 /*
-- 
2.34.1