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

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Message-Id: <20230915200335.never.098-kees@kernel.org>
Date:   Fri, 15 Sep 2023 13:03:36 -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 raid: Annotate struct raid_set 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 raid_set.

[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-raid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 5f9991765f27..9755788e8b78 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -254,7 +254,7 @@ struct raid_set {
 		int mode;
 	} journal_dev;
 
-	struct raid_dev dev[];
+	struct raid_dev dev[] __counted_by(raid_disks);
 };
 
 static void rs_config_backup(struct raid_set *rs, struct rs_layout *l)
-- 
2.34.1