From: Catalin Marinas <catalin.marinas@arm.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Linux ARM <linux-arm-kernel@lists.infradead.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
kasan-dev <kasan-dev@googlegroups.com>,
Will Deacon <will@kernel.org>
Subject: Re: arm64 KASAN_HW_TAGS panic on non-MTE hardware on 5.12-rc1
Date: Fri, 5 Mar 2021 17:52:43 +0000 [thread overview]
Message-ID: <20210305175243.GH23855@arm.com> (raw)
In-Reply-To: <20210305175124.GG23855@arm.com>
On Fri, Mar 05, 2021 at 05:51:26PM +0000, Catalin Marinas wrote:
> On Fri, Mar 05, 2021 at 06:27:45PM +0100, Andrey Konovalov wrote:
> > On Fri, Mar 5, 2021 at 6:11 PM Catalin Marinas <catalin.marinas@arm.com> wrote:
> > > Enabling CONFIG_KASAN_HW_TAGS and running the resulting kernel on
> > > non-MTE hardware panics with an undefined STG instruction from
> > > mte_set_mem_tag_range():
> > >
> > > ./scripts/faddr2line vmlinux kasan_unpoison_task_stack+0x18/0x40
> > > kasan_unpoison_task_stack+0x18/0x40:
> > > mte_set_mem_tag_range at arch/arm64/include/asm/mte-kasan.h:71
> > > (inlined by) mte_set_mem_tag_range at arch/arm64/include/asm/mte-kasan.h:56
> > > (inlined by) kasan_unpoison at mm/kasan/kasan.h:363
> > > (inlined by) kasan_unpoison_task_stack at mm/kasan/common.c:72
> >
> > This is weird. kasan_unpoison_task_stack() is only defined when
> > CONFIG_KASAN_STACK is enabled, which shouldn't be enablable for
> > HW_TAGS.
>
> CONFIG_KASAN=y
> # CONFIG_KASAN_GENERIC is not set
> CONFIG_KASAN_HW_TAGS=y
> CONFIG_KASAN_STACK=1
From Kconfig:
config KASAN_STACK
int
default 1 if KASAN_STACK_ENABLE || CC_IS_GCC
default 0
and I use gcc.
--
Catalin
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next prev parent reply other threads:[~2021-03-05 17:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-05 17:11 arm64 KASAN_HW_TAGS panic on non-MTE hardware on 5.12-rc1 Catalin Marinas
2021-03-05 17:27 ` Andrey Konovalov
[not found] ` <20210305175124.GG23855@arm.com>
2021-03-05 17:52 ` Catalin Marinas [this message]
2021-03-05 18:36 ` Andrey Konovalov
2021-03-06 12:01 ` Catalin Marinas
2021-03-08 14:56 ` Andrey Konovalov
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