linux-kernel - [PATCH 19/35] kasan: don't allow SW_TAGS with ARM64

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Message-Id: <5185661d553238884613a432cf1d71b1480a23ba.1597425745.git.andreyknvl@google.com>
Date:   Fri, 14 Aug 2020 19:27:01 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        kasan-dev@...glegroups.com
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 19/35] kasan: don't allow SW_TAGS with ARM64_MTE

Software tag-based KASAN provides its own tag checking machinery that
can conflict with MTE. Don't allow enabling software tag-based KASAN
when MTE is enabled.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 lib/Kconfig.kasan | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index b4cf6c519d71..e500c18cbe79 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -69,6 +69,7 @@ config KASAN_GENERIC
 config KASAN_SW_TAGS
 	bool "Software tag-based mode"
 	depends on HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS
+	depends on !ARM64_MTE
 	help
 	  Enables software tag-based KASAN mode.
 
-- 
2.28.0.220.ged08abb693-goog