diff options
| author | Andrey Konovalov <[email protected]> | 2020-12-22 12:01:56 -0800 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2020-12-22 12:55:08 -0800 |
| commit | ccbe2aaba1ed37441d8206a8c95b6199cbee2823 (patch) | |
| tree | c127973e32ff3d36d8de3357f91a3d4b77769225 | |
| parent | dc09b29fd0718300fad79d327d275b6ffb6d3315 (diff) | |
arm64: kasan: add arch layer for memory tagging helpers
This patch add a set of arch_*() memory tagging helpers currently only
defined for arm64 when hardware tag-based KASAN is enabled. These helpers
will be used by KASAN runtime to implement the hardware tag-based mode.
The arch-level indirection level is introduced to simplify adding hardware
tag-based KASAN support for other architectures in the future by defining
the appropriate arch_*() macros.
Link: https://lkml.kernel.org/r/fc9e5bb71201c03131a2fc00a74125723568dda9.1606161801.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <[email protected]>
Co-developed-by: Vincenzo Frascino <[email protected]>
Signed-off-by: Vincenzo Frascino <[email protected]>
Reviewed-by: Catalin Marinas <[email protected]>
Tested-by: Vincenzo Frascino <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Branislav Rankov <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Evgenii Stepanov <[email protected]>
Cc: Kevin Brodsky <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | arch/arm64/include/asm/memory.h | 9 | ||||
| -rw-r--r-- | mm/kasan/kasan.h | 26 |
2 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 556cb2d62b5b..3bc08e6cf82e 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -230,6 +230,15 @@ static inline const void *__tag_set(const void *addr, u8 tag) return (const void *)(__addr | __tag_shifted(tag)); } +#ifdef CONFIG_KASAN_HW_TAGS +#define arch_enable_tagging() mte_enable_kernel() +#define arch_init_tags(max_tag) mte_init_tags(max_tag) +#define arch_get_random_tag() mte_get_random_tag() +#define arch_get_mem_tag(addr) mte_get_mem_tag(addr) +#define arch_set_mem_tag_range(addr, size, tag) \ + mte_set_mem_tag_range((addr), (size), (tag)) +#endif /* CONFIG_KASAN_HW_TAGS */ + /* * Physical vs virtual RAM address space conversion. These are * private definitions which should NOT be used outside memory.h diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index 3b349a6e799d..bc4f28156157 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -243,6 +243,32 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag) #define reset_tag(addr) ((void *)arch_kasan_reset_tag(addr)) #define get_tag(addr) arch_kasan_get_tag(addr) +#ifdef CONFIG_KASAN_HW_TAGS + +#ifndef arch_enable_tagging +#define arch_enable_tagging() +#endif +#ifndef arch_init_tags +#define arch_init_tags(max_tag) +#endif +#ifndef arch_get_random_tag +#define arch_get_random_tag() (0xFF) +#endif +#ifndef arch_get_mem_tag +#define arch_get_mem_tag(addr) (0xFF) +#endif +#ifndef arch_set_mem_tag_range +#define arch_set_mem_tag_range(addr, size, tag) ((void *)(addr)) +#endif + +#define hw_enable_tagging() arch_enable_tagging() +#define hw_init_tags(max_tag) arch_init_tags(max_tag) +#define hw_get_random_tag() arch_get_random_tag() +#define hw_get_mem_tag(addr) arch_get_mem_tag(addr) +#define hw_set_mem_tag_range(addr, size, tag) arch_set_mem_tag_range((addr), (size), (tag)) + +#endif /* CONFIG_KASAN_HW_TAGS */ + /* * Exported functions for interfaces called from assembly or from generated * code. Declarations here to avoid warning about missing declarations. |