linux-kernel - [PATCH mm] kasan: initialize read-write lock in stack ring

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Message-Id: <576182d194e27531e8090bad809e4136953895f4.1663700262.git.andreyknvl@google.com>
Date:   Tue, 20 Sep 2022 20:58:07 +0200
From:   andrey.konovalov@...ux.dev
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        Yu Zhao <yuzhao@...gle.com>, linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH mm] kasan: initialize read-write lock in stack ring

From: Andrey Konovalov <andreyknvl@...gle.com>

Use __RW_LOCK_UNLOCKED to initialize stack_ring.lock.

Reported-by: Yu Zhao <yuzhao@...gle.com>
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

---

Andrew, could you please fold this patch into:
"kasan: implement stack ring for tag-based modes".
---
 mm/kasan/tags.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/kasan/tags.c b/mm/kasan/tags.c
index 9d867cae1b7b..67a222586846 100644
--- a/mm/kasan/tags.c
+++ b/mm/kasan/tags.c
@@ -36,7 +36,9 @@ DEFINE_STATIC_KEY_TRUE(kasan_flag_stacktrace);
 /* Non-zero, as initial pointer values are 0. */
 #define STACK_RING_BUSY_PTR ((void *)1)
 
-struct kasan_stack_ring stack_ring;
+struct kasan_stack_ring stack_ring = {
+	.lock = __RW_LOCK_UNLOCKED(stack_ring.lock)
+};
 
 /* kasan.stacktrace=off/on */
 static int __init early_kasan_flag_stacktrace(char *arg)
-- 
2.25.1