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arm64: kasan: add arch layer for memory tagging helpers

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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 <andreyknvl@google.com>
Co-developed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Marco Elver <elver@google.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: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2020-12-22 12:01:56 -08:00 committed by Linus Torvalds
parent dc09b29fd0
commit ccbe2aaba1
2 changed files with 35 additions and 0 deletions
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9
arch/arm64/include/asm/memory.h
View File

@ -230,6 +230,15 @@ static inline const void *__tag_set(const void *addr, u8 tag)
return (const void *)(__addr | __tag_shifted(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 * Physical vs virtual RAM address space conversion. These are
* private definitions which should NOT be used outside memory.h * private definitions which should NOT be used outside memory.h

26
mm/kasan/kasan.h
View File

@ -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 reset_tag(addr) ((void *)arch_kasan_reset_tag(addr))
#define get_tag(addr) arch_kasan_get_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 * Exported functions for interfaces called from assembly or from generated
* code. Declarations here to avoid warning about missing declarations. * code. Declarations here to avoid warning about missing declarations.