From: Catalin Marinas <catalin.marinas@arm.com>
To: Ard Biesheuvel <ardb+git@google.com>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, will@kernel.org,
Ard Biesheuvel <ardb@kernel.org>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Mark Brown <broonie@kernel.org>, Marc Zyngier <maz@kernel.org>,
stable@vger.kernel.org
Subject: Re: [PATCH v2 4/5] KVM: arm64: Omit tag sync on stage-2 mappings of the zero page
Date: Thu, 4 Jun 2026 17:50:15 +0100 [thread overview]
Message-ID: <aiGsx2Ls676t7-iJ@arm.com> (raw)
In-Reply-To: <20260604151151.150377-11-ardb+git@google.com>
On Thu, Jun 04, 2026 at 05:11:56PM +0200, Ard Biesheuvel wrote:
> From: Ard Biesheuvel <ardb@kernel.org>
>
> Commit
>
> f620d66af316 ("arm64: mte: Do not flag the zero page as PG_mte_tagged")
>
> removed the PG_mte_tagged flag from the zero page, but missed a KVM code
> path that may set this flag on the zero page when it is used in a
> stage-2 CoW mapping of anonymous memory.
>
> So disregard the zero page explicitly in sanitise_mte_tags().
>
> Fixes: f620d66af316 ("arm64: mte: Do not flag the zero page as PG_mte_tagged")
> Cc: <stable@vger.kernel.org> # 5.10.x
> Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2026-06-04 16:50 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-04 15:11 [PATCH v2 0/5] fixes for data/bss linear alias unmap series Ard Biesheuvel
2026-06-04 15:11 ` [PATCH v2 1/5] arm64: Rename page table BSS section to .bss..pgtbl Ard Biesheuvel
2026-06-04 16:09 ` Mark Brown
2026-06-04 15:11 ` [PATCH v2 2/5] kasan: Move generic KASAN page tables out of BSS too Ard Biesheuvel
2026-06-04 15:11 ` [PATCH v2 3/5] arm64: Avoid double evaluation of __ptep_get() Ard Biesheuvel
2026-06-04 15:11 ` [PATCH v2 4/5] KVM: arm64: Omit tag sync on stage-2 mappings of the zero page Ard Biesheuvel
2026-06-04 16:50 ` Catalin Marinas [this message]
2026-06-04 15:11 ` [PATCH v2 5/5] arm64: mm: Defer remap of linear alias of data/bss Ard Biesheuvel
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