diff mbox series

[v3,04/39] kasan: shadow declarations only for software modes

Message ID 9de4c3b360444c66fcf454e0880fc655c5d80395.1600987622.git.andreyknvl@google.com
State New, archived
Headers show
Series kasan: add hardware tag-based mode for arm64 | expand

Commit Message

Andrey Konovalov Sept. 24, 2020, 10:50 p.m. UTC
This is a preparatory commit for the upcoming addition of a new hardware
tag-based (MTE-based) KASAN mode.

Group shadow-related KASAN function declarations and only define them
for the two existing software modes.

No functional changes for software modes.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
---
Change-Id: I864be75a88b91b443c55e9c2042865e15703e164
---
 include/linux/kasan.h | 44 ++++++++++++++++++++++++++-----------------
 1 file changed, 27 insertions(+), 17 deletions(-)

Comments

Marco Elver Oct. 1, 2020, 5:29 p.m. UTC | #1
On Fri, Sep 25, 2020 at 12:50AM +0200, Andrey Konovalov wrote:
> This is a preparatory commit for the upcoming addition of a new hardware
> tag-based (MTE-based) KASAN mode.
> 
> Group shadow-related KASAN function declarations and only define them
> for the two existing software modes.
> 
> No functional changes for software modes.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>

Reviewed-by: Marco Elver <elver@google.com>

> ---
> Change-Id: I864be75a88b91b443c55e9c2042865e15703e164
> ---
>  include/linux/kasan.h | 44 ++++++++++++++++++++++++++-----------------
>  1 file changed, 27 insertions(+), 17 deletions(-)
> 
> diff --git a/include/linux/kasan.h b/include/linux/kasan.h
> index bd5b4965a269..44a9aae44138 100644
> --- a/include/linux/kasan.h
> +++ b/include/linux/kasan.h
> @@ -3,16 +3,24 @@
>  #define _LINUX_KASAN_H
>  
>  #include <linux/types.h>
> +#include <asm/kasan.h>
>  
>  struct kmem_cache;
>  struct page;
>  struct vm_struct;
>  struct task_struct;
>  
> -#ifdef CONFIG_KASAN
> +#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
>  
>  #include <linux/pgtable.h>
> -#include <asm/kasan.h>
> +
> +/* Software KASAN implementations use shadow memory. */
> +
> +#ifdef CONFIG_KASAN_SW_TAGS
> +#define KASAN_SHADOW_INIT 0xFF
> +#else
> +#define KASAN_SHADOW_INIT 0
> +#endif
>  
>  extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
>  extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE];
> @@ -29,6 +37,23 @@ static inline void *kasan_mem_to_shadow(const void *addr)
>  		+ KASAN_SHADOW_OFFSET;
>  }
>  
> +int kasan_add_zero_shadow(void *start, unsigned long size);
> +void kasan_remove_zero_shadow(void *start, unsigned long size);
> +
> +#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
> +
> +static inline int kasan_add_zero_shadow(void *start, unsigned long size)
> +{
> +	return 0;
> +}
> +static inline void kasan_remove_zero_shadow(void *start,
> +					unsigned long size)
> +{}
> +
> +#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
> +
> +#ifdef CONFIG_KASAN
> +
>  /* Enable reporting bugs after kasan_disable_current() */
>  extern void kasan_enable_current(void);
>  
> @@ -69,9 +94,6 @@ struct kasan_cache {
>  	int free_meta_offset;
>  };
>  
> -int kasan_add_zero_shadow(void *start, unsigned long size);
> -void kasan_remove_zero_shadow(void *start, unsigned long size);
> -
>  size_t __ksize(const void *);
>  static inline void kasan_unpoison_slab(const void *ptr)
>  {
> @@ -137,14 +159,6 @@ static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
>  	return false;
>  }
>  
> -static inline int kasan_add_zero_shadow(void *start, unsigned long size)
> -{
> -	return 0;
> -}
> -static inline void kasan_remove_zero_shadow(void *start,
> -					unsigned long size)
> -{}
> -
>  static inline void kasan_unpoison_slab(const void *ptr) { }
>  static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
>  
> @@ -152,8 +166,6 @@ static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
>  
>  #ifdef CONFIG_KASAN_GENERIC
>  
> -#define KASAN_SHADOW_INIT 0
> -
>  void kasan_cache_shrink(struct kmem_cache *cache);
>  void kasan_cache_shutdown(struct kmem_cache *cache);
>  void kasan_record_aux_stack(void *ptr);
> @@ -168,8 +180,6 @@ static inline void kasan_record_aux_stack(void *ptr) {}
>  
>  #ifdef CONFIG_KASAN_SW_TAGS
>  
> -#define KASAN_SHADOW_INIT 0xFF
> -
>  void kasan_init_tags(void);
>  
>  void *kasan_reset_tag(const void *addr);
> -- 
> 2.28.0.681.g6f77f65b4e-goog
>
diff mbox series

Patch

diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index bd5b4965a269..44a9aae44138 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -3,16 +3,24 @@ 
 #define _LINUX_KASAN_H
 
 #include <linux/types.h>
+#include <asm/kasan.h>
 
 struct kmem_cache;
 struct page;
 struct vm_struct;
 struct task_struct;
 
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
 
 #include <linux/pgtable.h>
-#include <asm/kasan.h>
+
+/* Software KASAN implementations use shadow memory. */
+
+#ifdef CONFIG_KASAN_SW_TAGS
+#define KASAN_SHADOW_INIT 0xFF
+#else
+#define KASAN_SHADOW_INIT 0
+#endif
 
 extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
 extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE];
@@ -29,6 +37,23 @@  static inline void *kasan_mem_to_shadow(const void *addr)
 		+ KASAN_SHADOW_OFFSET;
 }
 
+int kasan_add_zero_shadow(void *start, unsigned long size);
+void kasan_remove_zero_shadow(void *start, unsigned long size);
+
+#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
+
+static inline int kasan_add_zero_shadow(void *start, unsigned long size)
+{
+	return 0;
+}
+static inline void kasan_remove_zero_shadow(void *start,
+					unsigned long size)
+{}
+
+#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
+
+#ifdef CONFIG_KASAN
+
 /* Enable reporting bugs after kasan_disable_current() */
 extern void kasan_enable_current(void);
 
@@ -69,9 +94,6 @@  struct kasan_cache {
 	int free_meta_offset;
 };
 
-int kasan_add_zero_shadow(void *start, unsigned long size);
-void kasan_remove_zero_shadow(void *start, unsigned long size);
-
 size_t __ksize(const void *);
 static inline void kasan_unpoison_slab(const void *ptr)
 {
@@ -137,14 +159,6 @@  static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
 	return false;
 }
 
-static inline int kasan_add_zero_shadow(void *start, unsigned long size)
-{
-	return 0;
-}
-static inline void kasan_remove_zero_shadow(void *start,
-					unsigned long size)
-{}
-
 static inline void kasan_unpoison_slab(const void *ptr) { }
 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
 
@@ -152,8 +166,6 @@  static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
 
 #ifdef CONFIG_KASAN_GENERIC
 
-#define KASAN_SHADOW_INIT 0
-
 void kasan_cache_shrink(struct kmem_cache *cache);
 void kasan_cache_shutdown(struct kmem_cache *cache);
 void kasan_record_aux_stack(void *ptr);
@@ -168,8 +180,6 @@  static inline void kasan_record_aux_stack(void *ptr) {}
 
 #ifdef CONFIG_KASAN_SW_TAGS
 
-#define KASAN_SHADOW_INIT 0xFF
-
 void kasan_init_tags(void);
 
 void *kasan_reset_tag(const void *addr);