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    SubjectRe: [PATCH 19/35] kasan: don't allow SW_TAGS with ARM64_MTE
    On Fri, Aug 14, 2020 at 07:27:01PM +0200, Andrey Konovalov wrote:
    > 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@google.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

    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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