diff mbox series

KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache

Message ID 20240104183233.3560639-1-oliver.upton@linux.dev (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache | expand

Commit Message

Oliver Upton Jan. 4, 2024, 6:32 p.m. UTC
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>
---
 arch/arm64/kvm/vgic/vgic-its.c | 5 +++++
 1 file changed, 5 insertions(+)


base-commit: 33cc938e65a98f1d29d0a18403dbbee050dcad9a

Comments

Marc Zyngier Jan. 4, 2024, 7:33 p.m. UTC | #1
On Thu, 4 Jan 2024 18:32:32 +0000, Oliver Upton wrote:
> 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.

Applied to next, thanks!

[1/1] KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache
      commit: ad362fe07fecf0aba839ff2cc59a3617bd42c33f

Cheers,

	M.
diff mbox series

Patch

diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c
index 2dad2d095160..e2764d0ffa9f 100644
--- a/arch/arm64/kvm/vgic/vgic-its.c
+++ b/arch/arm64/kvm/vgic/vgic-its.c
@@ -590,7 +590,11 @@  static struct vgic_irq *vgic_its_check_cache(struct kvm *kvm, phys_addr_t db,
 	unsigned long flags;
 
 	raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
+
 	irq = __vgic_its_check_cache(dist, db, devid, eventid);
+	if (irq)
+		vgic_get_irq_kref(irq);
+
 	raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
 
 	return irq;
@@ -769,6 +773,7 @@  int vgic_its_inject_cached_translation(struct kvm *kvm, struct kvm_msi *msi)
 	raw_spin_lock_irqsave(&irq->irq_lock, flags);
 	irq->pending_latch = true;
 	vgic_queue_irq_unlock(kvm, irq, flags);
+	vgic_put_irq(kvm, irq);
 
 	return 0;
 }