mm: close PageTail race

commit 668f9abbd4334e6c29fa8acd71635c4f9101caa7 upstream.

Commit bf6bddf1924e ("mm: introduce compaction and migration for
ballooned pages") introduces page_count(page) into memory compaction
which dereferences page->first_page if PageTail(page).

This results in a very rare NULL pointer dereference on the
aforementioned page_count(page).  Indeed, anything that does
compound_head(), including page_count() is susceptible to racing with
prep_compound_page() and seeing a NULL or dangling page->first_page
pointer.

This patch uses Andrea's implementation of compound_trans_head() that
deals with such a race and makes it the default compound_head()
implementation.  This includes a read memory barrier that ensures that
if PageTail(head) is true that we return a head page that is neither
NULL nor dangling.  The patch then adds a store memory barrier to
prep_compound_page() to ensure page->first_page is set.

This is the safest way to ensure we see the head page that we are
expecting, PageTail(page) is already in the unlikely() path and the
memory barriers are unfortunately required.

Hugetlbfs is the exception, we don't enforce a store memory barrier
during init since no race is possible.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Holger Kiehl <Holger.Kiehl@dwd.de>
Cc: Christoph Lameter <cl@linux.com>
Cc: Rafael Aquini <aquini@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 12 insertions, 20 deletions

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 528454c2caa9..a193bb3e4138 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -159,23 +159,6 @@ static inline int hpage_nr_pages(struct page *page)
                 return HPAGE_PMD_NR;
         return 1;
 }
-static inline struct page *compound_trans_head(struct page *page)
-{
-        if (PageTail(page)) {
-                struct page *head;
-                head = page->first_page;
-                smp_rmb();
-                /*
-                 * head may be a dangling pointer.
-                 * __split_huge_page_refcount clears PageTail before
-                 * overwriting first_page, so if PageTail is still
-                 * there it means the head pointer isn't dangling.
-                 */
-                if (PageTail(page))
-                        return head;
-        }
-        return page;
-}
 
 extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
                                 unsigned long addr, pmd_t pmd, pmd_t *pmdp);
@@ -205,7 +188,6 @@ static inline int split_huge_page(struct page *page)
         do { } while (0)
 #define split_huge_page_pmd_mm(__mm, __address, __pmd)  \
         do { } while (0)
-#define compound_trans_head(page) compound_head(page)
 static inline int hugepage_madvise(struct vm_area_struct *vma,
                                    unsigned long *vm_flags, int advice)
 {
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3bf21c3502d0..a9a48309f045 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -361,8 +361,18 @@ static inline void compound_unlock_irqrestore(struct page *page,
 
 static inline struct page *compound_head(struct page *page)
 {
-        if (unlikely(PageTail(page)))
-                return page->first_page;
+        if (unlikely(PageTail(page))) {
+                struct page *head = page->first_page;
+
+                /*
+                 * page->first_page may be a dangling pointer to an old
+                 * compound page, so recheck that it is still a tail
+                 * page before returning.
+                 */
+                smp_rmb();
+                if (likely(PageTail(page)))
+                        return head;
+        }
         return page;
 }