KVM: arm64: Set the MTE tag bit before releasing the page

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Setting a page flag without holding a reference to the page
is living dangerously. In the tag-writing path, we drop the
reference to the page by calling kvm_release_pfn_dirty(),
and only then set the PG_mte_tagged bit.

It would be safer to do it the other way round.

Fixes: f0376edb1d ("KVM: arm64: Add ioctl to fetch/store tags in a guest")
Cc: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/87k0mjidwb.wl-maz@kernel.org

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Marc Zyngier 2021-06-24 14:21:05 +01:00

parent 04c02c201d

commit 98db7259fa

1 changed files with 8 additions and 4 deletions

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arch/arm64/kvm/guest.c

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