Hi Andrey, On 8/27/20 9:04 AM, Catalin Marinas wrote: > 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 <[email protected]> >> --- >> 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 >
I agree with Catalin here, "select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN && !ARM64_MTE" should be sufficient. -- Regards, Vincenzo
