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[3.12,58/63] arm/arm64: KVM: Don't allow creating VCPUs after vgic_initialized

Message ID 67ffa0e4618acd554a1c5a0fba54338e2bee0973.1430387326.git.jslaby@suse.cz
State New
Headers show

Commit Message

Jiri Slaby April 30, 2015, 12:12 p.m. UTC 
From: Christoffer Dall <christoffer.dall@linaro.org>

3.12-stable review patch.  If anyone has any objections, please let me know.
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Patch

===============

commit 716139df2517fbc3f2306dbe8eba0fa88dca0189 upstream.

When the vgic initializes its internal state it does so based on the
number of VCPUs available at the time.  If we allow KVM to create more
VCPUs after the VGIC has been initialized, we are likely to error out in
unfortunate ways later, perform buffer overflows etc.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 arch/arm/kvm/arm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index d1c5946e33a2..86dee11838ab 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -218,6 +218,11 @@  struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 	int err;
 	struct kvm_vcpu *vcpu;
 
+	if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
+		err = -EBUSY;
+		goto out;
+	}
+
 	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 	if (!vcpu) {
 		err = -ENOMEM;