linux-kernel - [PATCH RFC v2 05/21] kasan: allow VMAP_STACK for HW

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Message-Id: <1049f02fb4132390a6a314eb21dccfe5500e69d6.1603372719.git.andreyknvl@google.com>
Date:   Thu, 22 Oct 2020 15:18:57 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>
Cc:     Evgenii Stepanov <eugenis@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Serban Constantinescu <serbanc@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH RFC v2 05/21] kasan: allow VMAP_STACK for HW_TAGS mode

Even though hardware tag-based mode currently doesn't support checking
vmalloc allocations, it doesn't use shadow memory and works with
VMAP_STACK as is.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Link: https://linux-review.googlesource.com/id/I3552cbc12321dec82cd7372676e9372a2eb452ac
---
 arch/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index af14a567b493..3caf7bcdcf93 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -868,7 +868,7 @@ config VMAP_STACK
 	default y
 	bool "Use a virtually-mapped stack"
 	depends on HAVE_ARCH_VMAP_STACK
-	depends on !KASAN || KASAN_VMALLOC
+	depends on !(KASAN_GENERIC || KASAN_SW_TAGS) || KASAN_VMALLOC
 	help
 	  Enable this if you want the use virtually-mapped kernel stacks
 	  with guard pages.  This causes kernel stack overflows to be
-- 
2.29.0.rc1.297.gfa9743e501-goog