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arm/arm64: KVM: Take mmap_sem in stage2_unmap_vm 

We don't hold the mmap_sem while searching for the VMAs when
we try to unmap each memslot for a VM. Fix this properly to
avoid unexpected results.

Fixes: commit 957db105c9 ("arm/arm64: KVM: Introduce stage2_unmap_vm")
Cc: stable@vger.kernel.org # v3.19+
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
hifive-unleashed-5.1
Marc Zyngier 2017-03-16 18:20:49 +00:00
parent 955a3fc6d2
commit 90f6e150e4
1 changed files with 2 additions and 0 deletions
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2
arch/arm/kvm/mmu.c
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@ -803,6 +803,7 @@ void stage2_unmap_vm(struct kvm *kvm)
int idx;
idx = srcu_read_lock(&kvm->srcu);
down_read(&current->mm->mmap_sem);
spin_lock(&kvm->mmu_lock);
slots = kvm_memslots(kvm);
@ -810,6 +811,7 @@ void stage2_unmap_vm(struct kvm *kvm)
stage2_unmap_memslot(kvm, memslot);
spin_unlock(&kvm->mmu_lock);
up_read(&current->mm->mmap_sem);
srcu_read_unlock(&kvm->srcu, idx);
}