Verify that the redistributor regions do not extend beyond the VM-specified IPA size (phys_size). This can happen when using KVM_VGIC_V3_ADDR_TYPE_REDIST or KVM_VGIC_V3_ADDR_TYPE_REDIST_REGIONS with: base + size > phys_size AND base < phys_size Add the missing check into vgic_v3_alloc_redist_region() which is called when setting the regions, and into vgic_v3_check_base() which is called when attempting the first vcpu-run. The vcpu-run check does not apply to KVM_VGIC_V3_ADDR_TYPE_REDIST_REGIONS because the regions size is known before the first vcpu-run. Finally, this patch also enables some extra tests in vgic_v3_alloc_redist_region() by calculating "size" early for the legacy redist api. Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx> --- arch/arm64/kvm/vgic/vgic-mmio-v3.c | 7 ++++++- arch/arm64/kvm/vgic/vgic-v3.c | 4 ++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/vgic/vgic-mmio-v3.c b/arch/arm64/kvm/vgic/vgic-mmio-v3.c index a09cdc0b953c..055671bede85 100644 --- a/arch/arm64/kvm/vgic/vgic-mmio-v3.c +++ b/arch/arm64/kvm/vgic/vgic-mmio-v3.c @@ -796,7 +796,9 @@ static int vgic_v3_alloc_redist_region(struct kvm *kvm, uint32_t index, struct vgic_dist *d = &kvm->arch.vgic; struct vgic_redist_region *rdreg; struct list_head *rd_regions = &d->rd_regions; - size_t size = count * KVM_VGIC_V3_REDIST_SIZE; + int nr_vcpus = atomic_read(&kvm->online_vcpus); + size_t size = count ? count * KVM_VGIC_V3_REDIST_SIZE : + nr_vcpus * KVM_VGIC_V3_REDIST_SIZE; int ret; /* cross the end of memory ? */ @@ -834,6 +836,9 @@ static int vgic_v3_alloc_redist_region(struct kvm *kvm, uint32_t index, if (vgic_v3_rdist_overlap(kvm, base, size)) return -EINVAL; + if (base + size > kvm_phys_size(kvm)) + return -E2BIG; + rdreg = kzalloc(sizeof(*rdreg), GFP_KERNEL); if (!rdreg) return -ENOMEM; diff --git a/arch/arm64/kvm/vgic/vgic-v3.c b/arch/arm64/kvm/vgic/vgic-v3.c index 66004f61cd83..5afd9f6f68f6 100644 --- a/arch/arm64/kvm/vgic/vgic-v3.c +++ b/arch/arm64/kvm/vgic/vgic-v3.c @@ -512,6 +512,10 @@ bool vgic_v3_check_base(struct kvm *kvm) if (rdreg->base + vgic_v3_rd_region_size(kvm, rdreg) < rdreg->base) return false; + + if (rdreg->base + vgic_v3_rd_region_size(kvm, rdreg) > + kvm_phys_size(kvm)) + return false; } if (IS_VGIC_ADDR_UNDEF(d->vgic_dist_base)) -- 2.33.0.309.g3052b89438-goog
