From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Dmitry Vyukov <dvyukov@google.com>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
Evgenii Stepanov <eugenis@google.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>,
Elena Petrova <lenaptr@google.com>,
Andrey Konovalov <andreyknvl@google.com>,
Kevin Brodsky <kevin.brodsky@arm.com>,
linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
linux-mm@kvack.org, Andrey Ryabinin <aryabinin@virtuozzo.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH RFC 7/8] arm64: kasan: Add system_supports_tags helper
Date: Wed, 14 Oct 2020 22:44:35 +0200 [thread overview]
Message-ID: <001de82050c77c5b49aab8ce2adcc7ed7d93e7ad.1602708025.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1602708025.git.andreyknvl@google.com>
Add a helper that exposes information about whether the system supports
memory tagging to be called in generic code.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Link: https://linux-review.googlesource.com/id/Ib4b56a42c57c6293df29a0cdfee334c3ca7bdab4
---
arch/arm64/include/asm/memory.h | 1 +
mm/kasan/kasan.h | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index b5d6b824c21c..6d2b7c54780e 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -232,6 +232,7 @@ static inline const void *__tag_set(const void *addr, u8 tag)
}
#ifdef CONFIG_KASAN_HW_TAGS
+#define arch_system_supports_tags() system_supports_mte()
#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)
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index e5b8367a07f2..47d6074c7958 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -257,6 +257,9 @@ 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_system_supports_tags
+#define arch_system_supports_tags() (false)
+#endif
#ifndef arch_init_tags
#define arch_init_tags(max_tag)
#endif
@@ -270,6 +273,7 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
#define arch_set_mem_tag_range(addr, size, tag) ((void *)(addr))
#endif
+#define system_supports_tags() arch_system_supports_tags()
#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)
--
2.28.0.1011.ga647a8990f-goog
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next prev parent reply other threads:[~2020-10-14 20:47 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-14 20:44 [PATCH RFC 0/8] kasan: hardware tag-based mode for production use on arm64 Andrey Konovalov
2020-10-14 20:44 ` [PATCH RFC 1/8] kasan: simplify quarantine_put call Andrey Konovalov
2020-10-14 20:44 ` [PATCH RFC 2/8] kasan: rename get_alloc/free_info Andrey Konovalov
2020-10-14 20:44 ` [PATCH RFC 3/8] kasan: introduce set_alloc_info Andrey Konovalov
2020-10-14 20:44 ` [PATCH RFC 4/8] kasan: unpoison stack only with CONFIG_KASAN_STACK Andrey Konovalov
2020-10-14 20:44 ` [PATCH RFC 5/8] kasan: mark kasan_init_tags as __init Andrey Konovalov
2020-10-15 10:23 ` Marco Elver
2020-10-16 13:04 ` Andrey Konovalov
2020-10-14 20:44 ` [PATCH RFC 6/8] kasan, arm64: move initialization message Andrey Konovalov
2020-10-14 20:44 ` Andrey Konovalov [this message]
2020-10-20 6:22 ` [PATCH RFC 7/8] arm64: kasan: Add system_supports_tags helper Hillf Danton
2020-10-20 12:39 ` Andrey Konovalov
2020-10-14 20:44 ` [PATCH RFC 8/8] kasan: add and integrate kasan_mode boot param Andrey Konovalov
2020-10-15 13:56 ` Marco Elver
2020-10-16 13:10 ` Andrey Konovalov
2020-10-15 14:41 ` [PATCH RFC 0/8] kasan: hardware tag-based mode for production use on arm64 Marco Elver
2020-10-16 13:17 ` Andrey Konovalov
2020-10-16 13:31 ` Marco Elver
2020-10-16 15:52 ` Andrey Konovalov
2020-10-19 22:51 ` Kostya Serebryany
2020-10-20 5:34 ` Dmitry Vyukov
2020-10-20 12:13 ` Andrey Konovalov
2020-10-16 15:52 ` Andrey Konovalov
2020-10-16 15:50 ` Andrey Konovalov
2020-10-19 12:23 ` Marco Elver
2020-10-20 5:20 ` Dmitry Vyukov
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