[PATCH v2] KVM: arm64: vgic-its: reject restored DTE with out-of-range num_eventid_bits

[Marc Zyngier]

On Tue, 19 May 2026 09:25:19 -0400, Michael Bommarito wrote:
> Userspace can restore an ITS Device Table Entry whose Size field encodes
> more EventID bits than the virtual ITS supports.  The live MAPD path
> rejects that state, but vgic_its_restore_dte() accepts it and stores the
> out-of-range value in dev->num_eventid_bits.
> 
> Reject restored DTEs with num_eventid_bits > VITS_TYPER_IDBITS before
> allocating the device.  This mirrors the MAPD check and prevents the
> restored state from reaching vgic_its_restore_itt(), where the unchecked
> value can be converted into an oversized scan_its_table() range.
> 
> [...]

Applied to fixes, thanks!

[1/1] KVM: arm64: vgic-its: reject restored DTE with out-of-range num_eventid_bits
      commit: 9ce754ed8e7ab4e3999767ce1505f85c449ccb07

Cheers,

	M.
-- 
Jazz isn't dead. It just smells funny.