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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/35126.1606402815@turing-police
  Link: https://lore.kernel.org/linux-arm-kernel/24105.1606397102@turing-police/

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>
Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
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>
[valdis.kletnieks@vt.edu: fix build issue with asmlinkage]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2020-12-22 12:00:17 -08:00 committed by Linus Torvalds
parent 3b1a4a8640
commit d5750edf6d
1 changed files with 32 additions and 16 deletions
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48
include/linux/kasan.h
View File

@ -11,7 +11,7 @@ struct task_struct;
#ifdef CONFIG_KASAN
#include <linux/pgtable.h>
#include <linux/linkage.h>
#include <asm/kasan.h>
/* kasan_data struct is used in KUnit tests for KASAN expected failures */
@ -20,6 +20,20 @@ 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 +49,23 @@ 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 +106,6 @@ 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 +171,6 @@ 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 +178,6 @@ 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 +192,6 @@ 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);