[PATCH v5 04/40] arm64: kasan: Add arch layer for memory tagging helpers
From: Andrey Konovalov <hidden>
Date: 2020-10-12 20:46:44
Also in:
linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), kasan, memory management, the rest · Maintainers:
Catalin Marinas, Will Deacon, Andrey Ryabinin, Andrew Morton, Linus Torvalds
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. Signed-off-by: Andrey Konovalov <redacted> 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> --- Change-Id: I42b0795a28067872f8308e00c6f0195bca435c2a --- arch/arm64/include/asm/memory.h | 8 ++++++++ mm/kasan/kasan.h | 18 ++++++++++++++++++ 2 files changed, 26 insertions(+)
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index e424fc3a68cb..268a3b6cebd2 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h@@ -231,6 +231,14 @@ 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_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 ac499456740f..633f8902e5e2 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h@@ -224,6 +224,24 @@ 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) +#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 init_tags(max_tag) arch_init_tags(max_tag) +#define get_random_tag() arch_get_random_tag() +#define get_mem_tag(addr) arch_get_mem_tag(addr) +#define set_mem_tag_range(addr, size, tag) arch_set_mem_tag_range((addr), (size), (tag)) + /* * Exported functions for interfaces called from assembly or from generated * code. Declarations here to avoid warning about missing declarations.
--
2.28.0.1011.ga647a8990f-goog
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