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author | 2010-06-22 14:23:11 +0800 | |
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committer | 2010-08-01 10:47:11 +0300 | |
commit | bbeb34062fbad287c949a945a516a0c15b179993 (patch) | |
tree | cf29b50e076ba1ddc07d5b1292f243653a2f67a9 /virt/kvm/kvm_main.c | |
parent | KVM: x86: Enable AVX for guest (diff) | |
download | linux-bbeb34062fbad287c949a945a516a0c15b179993.tar.gz linux-bbeb34062fbad287c949a945a516a0c15b179993.tar.bz2 linux-bbeb34062fbad287c949a945a516a0c15b179993.zip |
KVM: Fix a race condition for usage of is_hwpoison_address()
is_hwpoison_address accesses the page table, so the caller must hold
current->mm->mmap_sem in read mode. So fix its usage in hva_to_pfn of
kvm accordingly.
Comment is_hwpoison_address to remind other users.
Reported-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r-- | virt/kvm/kvm_main.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 74f731920945..ec2e3c6ac7ed 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -947,12 +947,13 @@ static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr) if (unlikely(npages != 1)) { struct vm_area_struct *vma; + down_read(¤t->mm->mmap_sem); if (is_hwpoison_address(addr)) { + up_read(¤t->mm->mmap_sem); get_page(hwpoison_page); return page_to_pfn(hwpoison_page); } - down_read(¤t->mm->mmap_sem); vma = find_vma(current->mm, addr); if (vma == NULL || addr < vma->vm_start || |