This is a note to let you know that I've just added the patch titled
KVM: VMX: fix use after free of vmx->loaded_vmcs
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-vmx-fix-use-after-free-of-vmx-loaded_vmcs.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 26a865f4aa8e66a6d94958de7656f7f1b03c6c56 Mon Sep 17 00:00:00 2001
From: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Date: Fri, 3 Jan 2014 17:00:51 -0200
Subject: KVM: VMX: fix use after free of vmx->loaded_vmcs
From: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
commit 26a865f4aa8e66a6d94958de7656f7f1b03c6c56 upstream.
After free_loaded_vmcs executes, the "loaded_vmcs" structure
is kfreed, and now vmx->loaded_vmcs points to a kfreed area.
Subsequent free_loaded_vmcs then attempts to manipulate
vmx->loaded_vmcs.
Switch the order to avoid the problem.
https://bugzilla.redhat.com/show_bug.cgi?id=1047892
Reviewed-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Cc: Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6281,8 +6281,8 @@ static void vmx_free_vcpu(struct kvm_vcp
struct vcpu_vmx *vmx = to_vmx(vcpu);
free_vpid(vmx);
- free_nested(vmx);
free_loaded_vmcs(vmx->loaded_vmcs);
+ free_nested(vmx);
kfree(vmx->guest_msrs);
kvm_vcpu_uninit(vcpu);
kmem_cache_free(kvm_vcpu_cache, vmx);
Patches currently in stable-queue which might be from mtosatti@xxxxxxxxxx are
queue-3.4/kvm-vmx-fix-use-after-free-of-vmx-loaded_vmcs.patch
queue-3.4/kvm-mmu-handle-invalid-root_hpa-at-__direct_map.patch
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