linux-kernel - Re: [PATCH v6 00/18] kasan: x86: arm64: KASAN tag-based mode for x86

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Message-Id: <20251029150806.e001a669d9dad6ff9167c1f0@linux-foundation.org>
Date: Wed, 29 Oct 2025 15:08:06 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Maciej Wieczor-Retman <m.wieczorretman@...me>
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Subject: Re: [PATCH v6 00/18] kasan: x86: arm64: KASAN tag-based mode for
 x86

On Wed, 29 Oct 2025 19:05:27 +0000 Maciej Wieczor-Retman <m.wieczorretman@...me> wrote:

> The patchset aims to add a KASAN tag-based mode for the x86 architecture
> with the help of the new CPU feature called Linear Address Masking
> (LAM). Main improvement introduced by the series is 2x lower memory
> usage compared to KASAN's generic mode, the only currently available
> mode on x86. The tag based mode may also find errors that the generic
> mode couldn't because of differences in how these modes operate.

Thanks.  Quite a lot of these patches aren't showing signs of review at
this time, so I'll skip v6 for now.

However patches 1&2 are fixes that have cc:stable.  It's best to
separate these out from the overall add-a-feature series please - their
path-to-mainline will be quite different.

I grabbed just those two patches for some testing, however their
changelogging isn't fully appropriate.  Can I ask that you resend these
as a two-patch series after updating the changelogs to clearly describe
the userspace-visible effects of the flaws which the patches fix?

This is to help -stable maintainers understand why we're proposing the
backports and it is to help people to predict whether these fixes might
address an issue which they or their customers are experiencing.