kvm: fix excessive pages un-pinning in kvm_iommu_map error path.

The third parameter of kvm_unpin_pages() when called from
kvm_iommu_map_pages() is wrong, it should be the number of pages to un-pin
and not the page size.

This error was facilitated with an inconsistent API: kvm_pin_pages() takes
a size, but kvn_unpin_pages() takes a number of pages, so fix the problem
by matching the two.

This was introduced by commit 350b8bd ("kvm: iommu: fix the third parameter
of kvm_iommu_put_pages (CVE-2014-3601)"), which fixes the lack of
un-pinning for pages intended to be un-pinned (i.e. memory leak) but
unfortunately potentially aggravated the number of pages we un-pin that
should have stayed pinned. As far as I understand though, the same
practical mitigations apply.

This issue was found during review of Red Hat 6.6 patches to prepare
Ksplice rebootless updates.

Thanks to Vegard for his time on a late Friday evening to help me in
understanding this code.

Fixes: 350b8bd ("kvm: iommu: fix the third parameter of... (CVE-2014-3601)")
Cc: stable@vger.kernel.org
Signed-off-by: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Jamie Iles <jamie.iles@oracle.com>
Reviewed-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index e51d9f9b995f1864faa6921a41cc0809ce69fb8a..c1e6ae989a432165f9d6871626929ed2ecb578e8 100644 (file)
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -43,13 +43,13 @@ static void kvm_iommu_put_pages(struct kvm *kvm,
                                gfn_t base_gfn, unsigned long npages);
 
 static pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn,
-                          unsigned long size)
+                          unsigned long npages)
 {
        gfn_t end_gfn;
        pfn_t pfn;
 
        pfn     = gfn_to_pfn_memslot(slot, gfn);
-       end_gfn = gfn + (size >> PAGE_SHIFT);
+       end_gfn = gfn + npages;
        gfn    += 1;
 
        if (is_error_noslot_pfn(pfn))
@@ -119,7 +119,7 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
                 * Pin all pages we are about to map in memory. This is
                 * important because we unmap and unpin in 4kb steps later.
                 */
-               pfn = kvm_pin_pages(slot, gfn, page_size);
+               pfn = kvm_pin_pages(slot, gfn, page_size >> PAGE_SHIFT);
                if (is_error_noslot_pfn(pfn)) {
                        gfn += 1;
                        continue;
@@ -131,7 +131,7 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
                if (r) {
                        printk(KERN_ERR "kvm_iommu_map_address:"
                               "iommu failed to map pfn=%llx\n", pfn);
-                       kvm_unpin_pages(kvm, pfn, page_size);
+                       kvm_unpin_pages(kvm, pfn, page_size >> PAGE_SHIFT);
                        goto unmap_pages;
                }