linux-kernel - [PATCH 3/6] mm/kasan, slub: don't disable interrupts when object leaves quarantine

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Date:	Mon, 1 Aug 2016 17:45:12 +0300
From:	Andrey Ryabinin <aryabinin@...tuozzo.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Alexander Potapenko <glider@...gle.com>,
	Dave Jones <davej@...emonkey.org.uk>,
	Vegard Nossum <vegard.nossum@...cle.com>,
	"Sasha Levin" <alexander.levin@...izon.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	<kasan-dev@...glegroups.com>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: [PATCH 3/6] mm/kasan, slub: don't disable interrupts when object leaves quarantine

SLUB doesn't require disabled interrupts to call ___cache_free().

Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
---
 mm/kasan/quarantine.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
index 65793f1..4852625 100644
--- a/mm/kasan/quarantine.c
+++ b/mm/kasan/quarantine.c
@@ -147,10 +147,14 @@ static void qlink_free(struct qlist_node *qlink, struct kmem_cache *cache)
 	struct kasan_alloc_meta *alloc_info = get_alloc_info(cache, object);
 	unsigned long flags;
 
-	local_irq_save(flags);
+	if (IS_ENABLED(CONFIG_SLAB))
+		local_irq_save(flags);
+
 	alloc_info->state = KASAN_STATE_FREE;
 	___cache_free(cache, object, _THIS_IP_);
-	local_irq_restore(flags);
+
+	if (IS_ENABLED(CONFIG_SLAB))
+		local_irq_restore(flags);
 }
 
 static void qlist_free_all(struct qlist_head *q, struct kmem_cache *cache)
-- 
2.7.3