linux-kernel - [PATCH 23/31] kasan, arm64: allow KASAN_VMALLOC with SW

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Message-Id: <f90dfb0c02598aab3ad1b5b6ea4a4104b14e099d.1638308023.git.andreyknvl@google.com>
Date:   Tue, 30 Nov 2021 23:07:51 +0100
From:   andrey.konovalov@...ux.dev
To:     Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Peter Collingbourne <pcc@...gle.com>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        kasan-dev@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Evgenii Stepanov <eugenis@...gle.com>,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 23/31] kasan, arm64: allow KASAN_VMALLOC with SW_TAGS

From: Andrey Konovalov <andreyknvl@...gle.com>

vmalloc support for SW_TAGS KASAN is now complete.

Allow enabling CONFIG_KASAN_VMALLOC.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 arch/arm64/Kconfig | 1 +
 lib/Kconfig.kasan  | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index c4207cf9bb17..c05d7a06276f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -206,6 +206,7 @@ config ARM64
 	select IRQ_DOMAIN
 	select IRQ_FORCED_THREADING
 	select KASAN_VMALLOC if KASAN_GENERIC
+	select KASAN_VMALLOC if KASAN_SW_TAGS
 	select MODULES_USE_ELF_RELA
 	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index cdc842d090db..3f144a87f8a3 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -179,7 +179,7 @@ config KASAN_TAGS_IDENTIFY
 
 config KASAN_VMALLOC
 	bool "Back mappings in vmalloc space with real shadow memory"
-	depends on KASAN_GENERIC && HAVE_ARCH_KASAN_VMALLOC
+	depends on (KASAN_GENERIC || KASAN_SW_TAGS) && HAVE_ARCH_KASAN_VMALLOC
 	help
 	  By default, the shadow region for vmalloc space is the read-only
 	  zero page. This means that KASAN cannot detect errors involving
-- 
2.25.1