From: Andrey Konovalov <andreyknvl@google.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Dmitry Vyukov <dvyukov@google.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
Evgenii Stepanov <eugenis@google.com>,
Branislav Rankov <Branislav.Rankov@arm.com>,
Kevin Brodsky <kevin.brodsky@arm.com>,
kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH mm v4 10/19] kasan: inline (un)poison_range and check_invalid_free
Date: Mon, 23 Nov 2020 21:14:40 +0100 [thread overview]
Message-ID: <7007955b69eb31b5376a7dc1e0f4ac49138504f2.1606162397.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1606162397.git.andreyknvl@google.com>
Using (un)poison_range() 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@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Link: https://linux-review.googlesource.com/id/Ia9d8191024a12d1374675b3d27197f10193f50bb
---
mm/kasan/hw_tags.c | 30 ------------------------------
mm/kasan/kasan.h | 45 ++++++++++++++++++++++++++++++++++++++++-----
2 files changed, 40 insertions(+), 35 deletions(-)
diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
index 3cdd87d189f6..863fed4edd3f 100644
--- a/mm/kasan/hw_tags.c
+++ b/mm/kasan/hw_tags.c
@@ -10,7 +10,6 @@
#include <linux/kasan.h>
#include <linux/kernel.h>
-#include <linux/kfence.h>
#include <linux/memory.h>
#include <linux/mm.h>
#include <linux/string.h>
@@ -31,35 +30,6 @@ void __init kasan_init_hw_tags(void)
pr_info("KernelAddressSanitizer initialized\n");
}
-void poison_range(const void *address, size_t size, u8 value)
-{
- /* Skip KFENCE memory if called explicitly outside of sl*b. */
- if (is_kfence_address(address))
- return;
-
- hw_set_mem_tag_range(kasan_reset_tag(address),
- round_up(size, KASAN_GRANULE_SIZE), value);
-}
-
-void unpoison_range(const void *address, size_t size)
-{
- /* Skip KFENCE memory if called explicitly outside of sl*b. */
- if (is_kfence_address(address))
- return;
-
- 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 7876a2547b7d..8aa83b7ad79e 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -3,6 +3,7 @@
#define __MM_KASAN_KASAN_H
#include <linux/kasan.h>
+#include <linux/kfence.h>
#include <linux/stackdepot.h>
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
@@ -154,9 +155,6 @@ 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 poison_range(const void *address, size_t size, u8 value);
-void unpoison_range(const void *address, size_t size);
-
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
@@ -196,8 +194,6 @@ 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);
@@ -278,6 +274,45 @@ static inline u8 random_tag(void) { return hw_get_random_tag(); }
static inline u8 random_tag(void) { return 0; }
#endif
+#ifdef CONFIG_KASAN_HW_TAGS
+
+static inline void poison_range(const void *address, size_t size, u8 value)
+{
+ /* Skip KFENCE memory if called explicitly outside of sl*b. */
+ if (is_kfence_address(address))
+ return;
+
+ hw_set_mem_tag_range(kasan_reset_tag(address),
+ round_up(size, KASAN_GRANULE_SIZE), value);
+}
+
+static inline void unpoison_range(const void *address, size_t size)
+{
+ /* Skip KFENCE memory if called explicitly outside of sl*b. */
+ if (is_kfence_address(address))
+ return;
+
+ hw_set_mem_tag_range(kasan_reset_tag(address),
+ round_up(size, KASAN_GRANULE_SIZE), get_tag(address));
+}
+
+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 poison_range(const void *address, size_t size, u8 value);
+void unpoison_range(const void *address, size_t size);
+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.
--
2.29.2.454.gaff20da3a2-goog
next prev parent reply other threads:[~2020-11-23 20:15 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-23 20:14 [PATCH mm v4 00/19] kasan: boot parameters for hardware tag-based mode Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 01/19] kasan: simplify quarantine_put call site Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 02/19] kasan: rename get_alloc/free_info Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 03/19] kasan: introduce set_alloc_info Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 04/19] kasan, arm64: unpoison stack only with CONFIG_KASAN_STACK Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 05/19] kasan: allow VMAP_STACK for HW_TAGS mode Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 06/19] kasan: remove __kasan_unpoison_stack Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 07/19] kasan: inline kasan_reset_tag for tag-based modes Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 08/19] kasan: inline random_tag for HW_TAGS Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 09/19] kasan: open-code kasan_unpoison_slab Andrey Konovalov
2020-11-23 20:14 ` Andrey Konovalov [this message]
2020-11-23 20:14 ` [PATCH mm v4 11/19] kasan: add and integrate kasan boot parameters Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 12/19] kasan, mm: check kasan_enabled in annotations Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 13/19] kasan, mm: rename kasan_poison_kfree Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 14/19] kasan: don't round_up too much Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 15/19] kasan: simplify assign_tag and set_tag calls Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 16/19] kasan: clarify comment in __kasan_kfree_large Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 17/19] kasan: sanitize objects when metadata doesn't fit Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 18/19] kasan, mm: allow cache merging with no metadata Andrey Konovalov
2020-11-23 20:14 ` [PATCH mm v4 19/19] kasan: update documentation Andrey Konovalov
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