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Oliver Upton d04acadb64 KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache ... [ Upstream commit ad362fe07fecf0aba839ff2cc59a3617bd42c33f ] There is a potential UAF scenario in the case of an LPI translation cache hit racing with an operation that invalidates the cache, such as a DISCARD ITS command. The root of the problem is that vgic_its_check_cache() does not elevate the refcount on the vgic_irq before dropping the lock that serializes refcount changes. Have vgic_its_check_cache() raise the refcount on the returned vgic_irq and add the corresponding decrement after queueing the interrupt. Cc: stable@vger.kernel.org Signed-off-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20240104183233.3560639-1-oliver.upton@linux.dev Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-02-23 08:25:14 +01:00
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kvm	KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache	2024-02-23 08:25:14 +01:00
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