linux-kernel - Re: [PATCH v8 00/14] kasan: x86: arm64: KASAN tag-based mode for x86

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Message-Id: <20260112125348.124d201ef2baf762561a43af@linux-foundation.org>
Date: Mon, 12 Jan 2026 12:53:48 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Maciej Wieczór-Retman <m.wieczorretman@...me>
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Subject: Re: [PATCH v8 00/14] kasan: x86: arm64: KASAN tag-based mode for
 x86

On Mon, 12 Jan 2026 20:08:23 +0000 Maciej Wieczór-Retman <m.wieczorretman@...me> wrote:

> >OK, known issues and they are understandable.  With this patchset is
> >there any way in which our testers can encounter these things?  If so
> >can we make changes to protect them from hitting known issues?
> 
> The gcc documentation states that the -fsanitize=kernel-hwaddress is
> similar to -fsanitize=hwaddress, which only works on AArch64. So that
> hints that it shouldn't work.
> 
> But while with KASAN sw_tags enabled the kernel compiles fine with gcc,
> at least in my patched qemu it doesn't run. I remember Ada Couprie Diaz
> mention that passing -march=arrowlake might help since the tag support
> seems to be based on arch.
> 
> I'll check if there's a non-hacky way to have gcc work too, but perhaps
> to minimize hitting known issue, for now HAVE_ARCH_KASAN_SW_TAGS should
> be locked behind both ADDRESS_MASKING and CC_IS_CLANG in the Kconfig?

Yes please - my main concern is that we avoid causing any disruption to
testers/buildbots/fuzzers/etc.