Commit 0d3c9468 authored by Andrey Konovalov's avatar Andrey Konovalov Committed by Andrew Morton
Browse files

kasan, arm64: add arch_suppress_tag_checks_start/stop 

Add two new tagging-related routines arch_suppress_tag_checks_start/stop
that suppress MTE tag checking via the TCO register.

These rouines are used in the next patch.

[andreyknvl@google.com: drop __ from mte_disable/enable_tco names]
  Link: https://lkml.kernel.org/r/7ad5e5a9db79e3aba08d8f43aca24350b04080f6.1680114854.git.andreyknvl@google.com
Link: https://lkml.kernel.org/r/75a362551c3c54b70ae59a3492cabb51c105fa6b.1678491668.git.andreyknvl@google.com


Signed-off-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Weizhao Ouyang <ouyangweizhao@zeku.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 2cc029a0

arch/arm64/include/asm/memory.h

+2 −0
Original line number Diff line number Diff line
@@ -264,6 +264,8 @@ static inline const void *__tag_set(const void *addr, u8 tag) 
#define arch_enable_tag_checks_sync()		mte_enable_kernel_sync()

#define arch_enable_tag_checks_async()		mte_enable_kernel_async()

#define arch_enable_tag_checks_asymm()		mte_enable_kernel_asymm()

#define arch_suppress_tag_checks_start()	mte_enable_tco()

#define arch_suppress_tag_checks_stop()		mte_disable_tco()

#define arch_force_async_tag_fault()		mte_check_tfsr_exit()

#define arch_get_random_tag()			mte_get_random_tag()

#define arch_get_mem_tag(addr)			mte_get_mem_tag(addr)

mm/kasan/kasan.h

+2 −0
Original line number Diff line number Diff line
@@ -398,6 +398,8 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag) 
#define hw_enable_tag_checks_sync()		arch_enable_tag_checks_sync()

#define hw_enable_tag_checks_async()		arch_enable_tag_checks_async()

#define hw_enable_tag_checks_asymm()		arch_enable_tag_checks_asymm()

#define hw_suppress_tag_checks_start()		arch_suppress_tag_checks_start()

#define hw_suppress_tag_checks_stop()		arch_suppress_tag_checks_stop()

#define hw_force_async_tag_fault()		arch_force_async_tag_fault()

#define hw_get_random_tag()			arch_get_random_tag()

#define hw_get_mem_tag(addr)			arch_get_mem_tag(addr)