mm, dump_page: do not crash with bad compound_mapcount()

If a compound page is being split while dump_page() is being run on that
page, we can end up calling compound_mapcount() on a page that is no
longer compound.  This leads to a crash (already seen at least once in the
field), due to the VM_BUG_ON_PAGE() assertion inside compound_mapcount().

(The above is from Matthew Wilcox's analysis of Qian Cai's bug report.)

A similar problem is possible, via compound_pincount() instead of
compound_mapcount().

In order to avoid this kind of crash, make dump_page() slightly more
robust, by providing a pair of simpler routines that don't contain
assertions: head_mapcount() and head_pincount().

For debug tools, we don't want to go *too* far in this direction, but this
is a simple small fix, and the crash has already been seen, so it's a good
trade-off.

Reported-by: Qian Cai <cai@lca.pw>
Suggested-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: William Kucharski <william.kucharski@oracle.com>
Link: http://lkml.kernel.org/r/20200804214807.169256-1-jhubbard@nvidia.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index dc7b87310c1035c3e1cc02305e09d31fae7e2fb0..303a47a9769d6a517565d87016c20cf3c6637c81 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -779,6 +779,11 @@ static inline void *kvcalloc(size_t n, size_t size, gfp_t flags)
 extern void kvfree(const void *addr);
 extern void kvfree_sensitive(const void *addr, size_t len);
 
+static inline int head_mapcount(struct page *head)
+{
+       return atomic_read(compound_mapcount_ptr(head)) + 1;
+}
+
 /*
  * Mapcount of compound page as a whole, does not include mapped sub-pages.
  *
@@ -788,7 +793,7 @@ static inline int compound_mapcount(struct page *page)
 {
        VM_BUG_ON_PAGE(!PageCompound(page), page);
        page = compound_head(page);
-       return atomic_read(compound_mapcount_ptr(page)) + 1;
+       return head_mapcount(page);
 }
 
 /*
@@ -901,11 +906,16 @@ static inline bool hpage_pincount_available(struct page *page)
        return PageCompound(page) && compound_order(page) > 1;
 }
 
+static inline int head_pincount(struct page *head)
+{
+       return atomic_read(compound_pincount_ptr(head));
+}
+
 static inline int compound_pincount(struct page *page)
 {
        VM_BUG_ON_PAGE(!hpage_pincount_available(page), page);
        page = compound_head(page);
-       return atomic_read(compound_pincount_ptr(page));
+       return head_pincount(page);
 }
 
 static inline void set_compound_order(struct page *page, unsigned int order)

diff --git a/mm/debug.c b/mm/debug.c
index 8f569db9a51460bddf5e19f57b812f397f342ce6..ca8d1cacdecc83098b8c89ba8da22d59fefb56f3 100644 (file)
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -102,12 +102,12 @@ void __dump_page(struct page *page, const char *reason)
                if (hpage_pincount_available(page)) {
                        pr_warn("head:%p order:%u compound_mapcount:%d compound_pincount:%d\n",
                                        head, compound_order(head),
-                                       compound_mapcount(head),
-                                       compound_pincount(head));
+                                       head_mapcount(head),
+                                       head_pincount(head));
                } else {
                        pr_warn("head:%p order:%u compound_mapcount:%d\n",
                                        head, compound_order(head),
-                                       compound_mapcount(head));
+                                       head_mapcount(head));
                }
        }
        if (PageKsm(page))