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

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Message-ID: <ngwfbor66uhrgfe2g4nvziwqp3gtsbndlpnhnov7ew7535dysv@ieypsfjfmnlo>
Date: Thu, 30 Oct 2025 05:31:22 +0000
From: Maciej Wieczór-Retman <m.wieczorretman@...me>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: xin@...or.com, peterz@...radead.org, kaleshsingh@...gle.com, kbingham@...nel.org, nathan@...nel.org, ryabinin.a.a@...il.com, dave.hansen@...ux.intel.com, bp@...en8.de, morbo@...gle.com, jeremy.linton@....com, smostafa@...gle.com, kees@...nel.org, baohua@...nel.org, vbabka@...e.cz, justinstitt@...gle.com, wangkefeng.wang@...wei.com, leitao@...ian.org, jan.kiszka@...mens.com, fujita.tomonori@...il.com, hpa@...or.com, urezki@...il.com, ubizjak@...il.com, ada.coupriediaz@....com, nick.desaulniers+lkml@...il.com, ojeda@...nel.org, brgerst@...il.com, elver@...gle.com, pankaj.gupta@....com, glider@...gle.com, mark.rutland@....com, trintaeoitogc@...il.com, jpoimboe@...nel.org, thuth@...hat.com, pasha.tatashin@...een.com, dvyukov@...gle.com, jhubbard@...dia.com, catalin.marinas@....com, yeoreum.yun@....com, mhocko@...e.com, lorenzo.stoakes@...cle.com, samuel.holland@...ive.com, vincenzo.frascino@....com, bigeasy@...utronix.de, surenb@...gle.com, ardb@...nel.org, Liam.Howlett@...cle.com,
	nicolas.schier@...ux.dev, ziy@...dia.com, kas@...nel.org, tglx@...utronix.de, mingo@...hat.com, broonie@...nel.org, corbet@....net, andreyknvl@...il.com, maciej.wieczor-retman@...el.com, david@...hat.com, maz@...nel.org, rppt@...nel.org, will@...nel.org, luto@...nel.org, kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, x86@...nel.org, linux-kbuild@...r.kernel.org, linux-mm@...ck.org, llvm@...ts.linux.dev, linux-doc@...r.kernel.org
Subject: Re: [PATCH v6 00/18] kasan: x86: arm64: KASAN tag-based mode for x86

Thanks for taking a look at the series!

On 2025-10-29 at 15:08:06 -0700, Andrew Morton wrote:
>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.

Okay, I'll send them separately

>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.

Sure, I'll also fixup that undefined symbol error that you mentioned in
the second email.

kind regards
Maciej Wieczór-Retman