Commit 4fd44105 authored by Andrey Konovalov's avatar Andrey Konovalov Committed by Vincenzo Frascino
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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.

Signed-off-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Co-developed-by: Vincenzo Frascino's avatarVincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Vincenzo Frascino's avatarVincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Catalin Marinas's avatarCatalin Marinas <catalin.marinas@arm.com>
---
Change-Id: I42b0795a28067872f8308e00c6f0195bca435c2a
parent d4eb95ba
......@@ -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
......
......@@ -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.
......
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