linux-kernel - [PATCH 1/2] kfence: always use static branches to guard kfence

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Message-Id: <20211019102524.2807208-1-elver@google.com>
Date:   Tue, 19 Oct 2021 12:25:23 +0200
From:   Marco Elver <elver@...gle.com>
To:     elver@...gle.com, Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Jann Horn <jannh@...gle.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, kasan-dev@...glegroups.com
Subject: [PATCH 1/2] kfence: always use static branches to guard kfence_alloc()

Regardless of KFENCE mode (CONFIG_KFENCE_STATIC_KEYS: either using
static keys to gate allocations, or using a simple dynamic branch),
always use a static branch to avoid the dynamic branch in kfence_alloc()
if KFENCE was disabled at boot.

For CONFIG_KFENCE_STATIC_KEYS=n, this now avoids the dynamic branch if
KFENCE was disabled at boot.

To simplify, also unifies the location where kfence_allocation_gate is
read-checked to just be inline in kfence_alloc().

Signed-off-by: Marco Elver <elver@...gle.com>
---
 include/linux/kfence.h | 21 +++++++++++----------
 mm/kfence/core.c       | 16 +++++++---------
 2 files changed, 18 insertions(+), 19 deletions(-)

diff --git a/include/linux/kfence.h b/include/linux/kfence.h
index 3fe6dd8a18c1..4b5e3679a72c 100644
--- a/include/linux/kfence.h
+++ b/include/linux/kfence.h
@@ -14,6 +14,9 @@
 
 #ifdef CONFIG_KFENCE
 
+#include <linux/atomic.h>
+#include <linux/static_key.h>
+
 /*
  * We allocate an even number of pages, as it simplifies calculations to map
  * address to metadata indices; effectively, the very first page serves as an
@@ -22,13 +25,8 @@
 #define KFENCE_POOL_SIZE ((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 * PAGE_SIZE)
 extern char *__kfence_pool;
 
-#ifdef CONFIG_KFENCE_STATIC_KEYS
-#include <linux/static_key.h>
 DECLARE_STATIC_KEY_FALSE(kfence_allocation_key);
-#else
-#include <linux/atomic.h>
 extern atomic_t kfence_allocation_gate;
-#endif
 
 /**
  * is_kfence_address() - check if an address belongs to KFENCE pool
@@ -116,13 +114,16 @@ void *__kfence_alloc(struct kmem_cache *s, size_t size, gfp_t flags);
  */
 static __always_inline void *kfence_alloc(struct kmem_cache *s, size_t size, gfp_t flags)
 {
-#ifdef CONFIG_KFENCE_STATIC_KEYS
-	if (static_branch_unlikely(&kfence_allocation_key))
+#if defined(CONFIG_KFENCE_STATIC_KEYS) || CONFIG_KFENCE_SAMPLE_INTERVAL == 0
+	if (!static_branch_unlikely(&kfence_allocation_key))
+		return NULL;
 #else
-	if (unlikely(!atomic_read(&kfence_allocation_gate)))
+	if (!static_branch_likely(&kfence_allocation_key))
+		return NULL;
 #endif
-		return __kfence_alloc(s, size, flags);
-	return NULL;
+	if (likely(atomic_read(&kfence_allocation_gate)))
+		return NULL;
+	return __kfence_alloc(s, size, flags);
 }
 
 /**
diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index 802905b1c89b..09945784df9e 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -104,10 +104,11 @@ struct kfence_metadata kfence_metadata[CONFIG_KFENCE_NUM_OBJECTS];
 static struct list_head kfence_freelist = LIST_HEAD_INIT(kfence_freelist);
 static DEFINE_RAW_SPINLOCK(kfence_freelist_lock); /* Lock protecting freelist. */
 
-#ifdef CONFIG_KFENCE_STATIC_KEYS
-/* The static key to set up a KFENCE allocation. */
+/*
+ * The static key to set up a KFENCE allocation; or if static keys are not used
+ * to gate allocations, to avoid a load and compare if KFENCE is disabled.
+ */
 DEFINE_STATIC_KEY_FALSE(kfence_allocation_key);
-#endif
 
 /* Gates the allocation, ensuring only one succeeds in a given period. */
 atomic_t kfence_allocation_gate = ATOMIC_INIT(1);
@@ -774,6 +775,8 @@ void __init kfence_init(void)
 		return;
 	}
 
+	if (!IS_ENABLED(CONFIG_KFENCE_STATIC_KEYS))
+		static_branch_enable(&kfence_allocation_key);
 	WRITE_ONCE(kfence_enabled, true);
 	queue_delayed_work(system_unbound_wq, &kfence_timer, 0);
 	pr_info("initialized - using %lu bytes for %d objects at 0x%p-0x%p\n", KFENCE_POOL_SIZE,
@@ -866,12 +869,7 @@ void *__kfence_alloc(struct kmem_cache *s, size_t size, gfp_t flags)
 		return NULL;
 	}
 
-	/*
-	 * allocation_gate only needs to become non-zero, so it doesn't make
-	 * sense to continue writing to it and pay the associated contention
-	 * cost, in case we have a large number of concurrent allocations.
-	 */
-	if (atomic_read(&kfence_allocation_gate) || atomic_inc_return(&kfence_allocation_gate) > 1)
+	if (atomic_inc_return(&kfence_allocation_gate) > 1)
 		return NULL;
 #ifdef CONFIG_KFENCE_STATIC_KEYS
 	/*
-- 
2.33.0.1079.g6e70778dc9-goog