KVM: arm64: Omit tag sync on stage-2 mappings of the zero page

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   f620d66af3 ("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: f620d66af3 ("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>
Signed-off-by: Will Deacon <will@kernel.org>

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Ard Biesheuvel 2026-06-04 17:11:56 +02:00 • committed by Will Deacon

parent 568def8e87

commit 2986a62574

1 changed files with 5 additions and 0 deletions

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arch/arm64/kvm/mmu.c

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