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ANDROID: KVM: arm64: iommu: Harden __pkvm_iommu_pm_notify

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Currently __pkvm_iommu_pm_notify always changes the value of
dev->powered following a suspend/resume attempt. This could potentially
be abused to force the hypervisor to stop issuing updates to an S2MPU
and preserving an old/invalid state.

Modify to only update the power state if suspend/resume was successful.

Bug: 190463801
Signed-off-by: David Brazdil <dbrazdil@google.com>
Change-Id: I285fc822e9fc926c49b9b5e69446790e1edccafb
This commit is contained in:
David Brazdil
2022-03-15 11:37:28 +00:00
parent a75cb9df82
commit 6eaed0b8b7
1 changed files with 4 additions and 2 deletions
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6
arch/arm64/kvm/hyp/nvhe/iommu.c
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@@ -360,10 +360,12 @@ int __pkvm_iommu_pm_notify(unsigned long dev_id, enum pkvm_iommu_pm_event event)
if (dev) {
if (event == PKVM_IOMMU_PM_SUSPEND) {
ret = dev->ops->suspend ? dev->ops->suspend(dev) : 0;
dev->powered = !!ret;
if (!ret)
dev->powered = false;
} else if (event == PKVM_IOMMU_PM_RESUME) {
ret = dev->ops->resume ? dev->ops->resume(dev) : 0;
dev->powered = !ret;
if (!ret)
dev->powered = true;
} else {
ret = -EINVAL;
}