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authorHuang Ying <ying.huang@intel.com>2010-06-22 14:23:11 +0800
committerAvi Kivity <avi@redhat.com>2010-08-01 10:47:11 +0300
commitbbeb34062fbad287c949a945a516a0c15b179993 (patch)
treecf29b50e076ba1ddc07d5b1292f243653a2f67a9 /mm/memory-failure.c
parent6c3f6041172b78d5532c6bf3680d304e92ec2e66 (diff)
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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 'mm/memory-failure.c')
-rw-r--r--mm/memory-failure.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 378b0f61fd3..6b44e52caca 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1298,6 +1298,9 @@ done:
return ret;
}
+/*
+ * The caller must hold current->mm->mmap_sem in read mode.
+ */
int is_hwpoison_address(unsigned long addr)
{
pgd_t *pgdp;