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authorAndrey Konovalov <andreyknvl@google.com>2020-12-10 15:42:06 +1100
committerStephen Rothwell <sfr@canb.auug.org.au>2020-12-16 18:02:56 +1100
commite2622996f4cc5e37afa0655180c65b34f12657bd (patch)
treebd0c7315ecdd592631ae748f7925ca70f1e445ed
parent8776950847b1a90bd0c0dc96dd6ffa56a68bd470 (diff)
downloadlinux-e2622996f4cc5e37afa0655180c65b34f12657bd.tar.gz
kasan: shadow declarations only for software modes
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. Link: https://lkml.kernel.org/r/e88d94eff94db883a65dca52e1736d80d28dd9bc.1606161801.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Marco Elver <elver@google.com> Reviewed-by: Alexander Potapenko <glider@google.com> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Branislav Rankov <Branislav.Rankov@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
-rw-r--r--include/linux/kasan.h47
1 files changed, 31 insertions, 16 deletions
diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 59538e795df4..26f2ab92e7ca 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -11,7 +11,6 @@ struct task_struct;
#ifdef CONFIG_KASAN
-#include <linux/pgtable.h>
#include <asm/kasan.h>
/* kasan_data struct is used in KUnit tests for KASAN expected failures */
@@ -20,6 +19,20 @@ struct kunit_kasan_expectation {
bool report_found;
};
+#endif
+
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
+
+#include <linux/pgtable.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];
extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD];
@@ -35,6 +48,23 @@ 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);
@@ -75,9 +105,6 @@ 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)
{
@@ -143,14 +170,6 @@ 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; }
@@ -158,8 +177,6 @@ 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);
@@ -174,8 +191,6 @@ 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);