khugepaged: fix use-after-free in collapse_huge_page()

hugepage_vma_revalidate() tries to re-check if we still should try to
collapse small pages into huge one after the re-acquiring mmap_sem.

The problem Dmitry Vyukov reported[1] is that the vma found by
hugepage_vma_revalidate() can be suitable for huge pages, but not the
same vma we had before dropping mmap_sem.  And dereferencing original
vma can lead to fun results..

Let's use vma hugepage_vma_revalidate() found instead of assuming it's the
same as what we had before the lock was dropped.

[1] http://lkml.kernel.org/r/CACT4Y+Z3gigBvhca9kRJFcjX0G70V_nRhbwKBU+yGoESBDKi9Q@mail.gmail.com

Link: http://lkml.kernel.org/r/20160907122559.GA6542@black.fi.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Ebru Akagunduz <ebru.akagunduz@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Sasha Levin <levinsasha928@gmail.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: syzkaller <syzkaller@googlegroups.com>
Cc: Kostya Serebryany <kcc@google.com>
Cc: Alexander Potapenko <glider@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 79c52d0061af..62339bf3c726 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -838,7 +838,8 @@ static bool hugepage_vma_check(struct vm_area_struct *vma)
  * value (scan code).
  */
 
-static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address)
+static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
+                struct vm_area_struct **vmap)
 {
         struct vm_area_struct *vma;
         unsigned long hstart, hend;
@@ -846,7 +847,7 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address)
         if (unlikely(khugepaged_test_exit(mm)))
                 return SCAN_ANY_PROCESS;
 
-        vma = find_vma(mm, address);
+        *vmap = vma = find_vma(mm, address);
         if (!vma)
                 return SCAN_VMA_NULL;
 
@@ -898,7 +899,7 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
                 /* do_swap_page returns VM_FAULT_RETRY with released mmap_sem */
                 if (ret & VM_FAULT_RETRY) {
                         down_read(&mm->mmap_sem);
-                        if (hugepage_vma_revalidate(mm, address)) {
+                        if (hugepage_vma_revalidate(mm, address, &fe.vma)) {
                                 /* vma is no longer available, don't continue to swapin */
                                 trace_mm_collapse_huge_page_swapin(mm, swapped_in, referenced, 0);
                                 return false;
@@ -923,7 +924,6 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
 static void collapse_huge_page(struct mm_struct *mm,
                                    unsigned long address,
                                    struct page **hpage,
-                                   struct vm_area_struct *vma,
                                    int node, int referenced)
 {
         pmd_t *pmd, _pmd;
@@ -933,6 +933,7 @@ static void collapse_huge_page(struct mm_struct *mm,
         spinlock_t *pmd_ptl, *pte_ptl;
         int isolated = 0, result = 0;
         struct mem_cgroup *memcg;
+        struct vm_area_struct *vma;
         unsigned long mmun_start;       /* For mmu_notifiers */
         unsigned long mmun_end;         /* For mmu_notifiers */
         gfp_t gfp;
@@ -961,7 +962,7 @@ static void collapse_huge_page(struct mm_struct *mm,
         }
 
         down_read(&mm->mmap_sem);
-        result = hugepage_vma_revalidate(mm, address);
+        result = hugepage_vma_revalidate(mm, address, &vma);
         if (result) {
                 mem_cgroup_cancel_charge(new_page, memcg, true);
                 up_read(&mm->mmap_sem);
@@ -994,7 +995,7 @@ static void collapse_huge_page(struct mm_struct *mm,
          * handled by the anon_vma lock + PG_lock.
          */
         down_write(&mm->mmap_sem);
-        result = hugepage_vma_revalidate(mm, address);
+        result = hugepage_vma_revalidate(mm, address, &vma);
         if (result)
                 goto out;
         /* check if the pmd is still valid */
@@ -1202,7 +1203,7 @@ out_unmap:
         if (ret) {
                 node = khugepaged_find_target_node();
                 /* collapse_huge_page will return with the mmap_sem released */
-                collapse_huge_page(mm, address, hpage, vma, node, referenced);
+                collapse_huge_page(mm, address, hpage, node, referenced);
         }
 out:
         trace_mm_khugepaged_scan_pmd(mm, page, writable, referenced,