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Date: Tue, 26 Jan 2010 15:34:55 -0800 From: Greg KH <gregkh@...e.de> To: linux-kernel@...r.kernel.org, stable@...nel.org Cc: stable-review@...nel.org, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, Marcelo Tosatti <mtosatti@...hat.com> Subject: [89/98] KVM: MMU: bail out pagewalk on kvm_read_guest error 2.6.32-stable review patch. If anyone has any objections, please let us know. ------------------ From: Marcelo Tosatti <mtosatti@...hat.com> commit a6085fbaf65ab09bfb5ec8d902d6d21680fe1895 upstream. Exit the guest pagetable walk loop if reading gpte failed. Otherwise its possible to enter an endless loop processing the previous present pte. Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de> --- arch/x86/kvm/paging_tmpl.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -150,7 +150,9 @@ walk: walker->table_gfn[walker->level - 1] = table_gfn; walker->pte_gpa[walker->level - 1] = pte_gpa; - kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte)); + if (kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte))) + goto not_present; + trace_kvm_mmu_paging_element(pte, walker->level); if (!is_present_gpte(pte)) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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