s390/gmap: validate VMA in __gmap_zap()

We should not walk/touch page tables outside of VMA boundaries when
holding only the mmap sem in read mode. Evil user space can modify the
VMA layout just before this function runs and e.g., trigger races with
page table removal code since commit 4dc981eb15b2 ("mm: mmap: zap pages
with read mmap_sem in munmap"). The pure prescence in our guest_to_host
radix tree does not imply that there is a VMA.

Further, we should not allocate page tables (via get_locked_pte()) outside
of VMA boundaries: if evil user space decides to map hugetlbfs to these
ranges, bad things will happen because we suddenly have PTE or PMD page
tables where we shouldn't have them.

Similarly, we have to check if we suddenly find a hugetlbfs VMA, before
calling get_locked_pte().

Note that gmap_discard() is different:
zap_page_range()->unmap_single_vma() makes sure to stay within VMA
boundaries.

Fixes: 3d80b65cf27b ("s390/kvm: support collaborative memory management")
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/20210909162248.14969-2-david@redhat.com
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index 4d3b33ce81c62f83c69961a2ca7d9d03ae821aea..e0735c3437759ccee564c8b1c77db881dc4fd718 100644 (file)
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -672,6 +672,7 @@ EXPORT_SYMBOL_GPL(gmap_fault);
  */
 void __gmap_zap(struct gmap *gmap, unsigned long gaddr)
 {
+       struct vm_area_struct *vma;
        unsigned long vmaddr;
        spinlock_t *ptl;
        pte_t *ptep;
@@ -681,6 +682,11 @@ void __gmap_zap(struct gmap *gmap, unsigned long gaddr)
                                                   gaddr >> PMD_SHIFT);
        if (vmaddr) {
                vmaddr |= gaddr & ~PMD_MASK;
+
+               vma = vma_lookup(gmap->mm, vmaddr);
+               if (!vma || is_vm_hugetlb_page(vma))
+                       return;
+
                /* Get pointer to the page table entry */
                ptep = get_locked_pte(gmap->mm, vmaddr, &ptl);
                if (likely(ptep))