linux-kernel - [PATCH 09/20] kasan: inline kasan_poison_memory and check_invalid

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Date:   Thu,  5 Nov 2020 01:02:19 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>
Cc:     Evgenii Stepanov <eugenis@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 09/20] kasan: inline kasan_poison_memory and check_invalid_free

Using kasan_poison_memory() or check_invalid_free() currently results in
function calls. Move their definitions to mm/kasan/kasan.h and turn them
into static inline functions for hardware tag-based mode to avoid
unneeded function calls.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
Link: https://linux-review.googlesource.com/id/Ia9d8191024a12d1374675b3d27197f10193f50bb
---
 mm/kasan/hw_tags.c | 15 ---------------
 mm/kasan/kasan.h   | 28 ++++++++++++++++++++++++----
 2 files changed, 24 insertions(+), 19 deletions(-)

diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
index d5824530fd15..9d7b1f1a2553 100644
--- a/mm/kasan/hw_tags.c
+++ b/mm/kasan/hw_tags.c
@@ -26,27 +26,12 @@ void kasan_init_hw_tags(void)
 		pr_info("KernelAddressSanitizer initialized\n");
 }
 
-void kasan_poison_memory(const void *address, size_t size, u8 value)
-{
-	hw_set_mem_tag_range(kasan_reset_tag(address),
-			round_up(size, KASAN_GRANULE_SIZE), value);
-}
-
 void kasan_unpoison_memory(const void *address, size_t size)
 {
 	hw_set_mem_tag_range(kasan_reset_tag(address),
 			round_up(size, KASAN_GRANULE_SIZE), get_tag(address));
 }
 
-bool check_invalid_free(void *addr)
-{
-	u8 ptr_tag = get_tag(addr);
-	u8 mem_tag = hw_get_mem_tag(addr);
-
-	return (mem_tag == KASAN_TAG_INVALID) ||
-		(ptr_tag != KASAN_TAG_KERNEL && ptr_tag != mem_tag);
-}
-
 void kasan_set_free_info(struct kmem_cache *cache,
 				void *object, u8 tag)
 {
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index d7a03eab5814..73364acf6ec8 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -153,8 +153,6 @@ struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
 struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
 						const void *object);
 
-void kasan_poison_memory(const void *address, size_t size, u8 value);
-
 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
 
 static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
@@ -194,8 +192,6 @@ void print_tags(u8 addr_tag, const void *addr);
 static inline void print_tags(u8 addr_tag, const void *addr) { }
 #endif
 
-bool check_invalid_free(void *addr);
-
 void *find_first_bad_addr(void *addr, size_t size);
 const char *get_bug_type(struct kasan_access_info *info);
 void metadata_fetch_row(char *buffer, void *row);
@@ -275,6 +271,30 @@ static inline u8 random_tag(void)
 }
 #endif
 
+#ifdef CONFIG_KASAN_HW_TAGS
+
+static inline void kasan_poison_memory(const void *address, size_t size, u8 value)
+{
+	hw_set_mem_tag_range(kasan_reset_tag(address),
+			round_up(size, KASAN_GRANULE_SIZE), value);
+}
+
+static inline bool check_invalid_free(void *addr)
+{
+	u8 ptr_tag = get_tag(addr);
+	u8 mem_tag = hw_get_mem_tag(addr);
+
+	return (mem_tag == KASAN_TAG_INVALID) ||
+		(ptr_tag != KASAN_TAG_KERNEL && ptr_tag != mem_tag);
+}
+
+#else /* CONFIG_KASAN_HW_TAGS */
+
+void kasan_poison_memory(const void *address, size_t size, u8 value);
+bool check_invalid_free(void *addr);
+
+#endif /* CONFIG_KASAN_HW_TAGS */
+
 /*
  * Exported functions for interfaces called from assembly or from generated
  * code. Declarations here to avoid warning about missing declarations.
-- 
2.29.1.341.ge80a0c044ae-goog