Re: [PATCH 19/35] kasan: don't allow SW_TAGS with ARM64_MTE
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2020-08-27 08:04:51
Also in:
linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
On Fri, Aug 14, 2020 at 07:27:01PM +0200, Andrey Konovalov wrote:
quoted hunk ↗ jump to hunk
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 <redacted> --- 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
I think that's better as:
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 10cf81d70657..736c32bd8905 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig@@ -131,7 +131,7 @@ config ARM64 select HAVE_ARCH_JUMP_LABEL select HAVE_ARCH_JUMP_LABEL_RELATIVE select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48) - select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN + select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN && !ARM64_MTE select HAVE_ARCH_KGDB select HAVE_ARCH_MMAP_RND_BITS select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
--
Catalin
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