[050/163] mm, dump_page: do not crash with bad compound_mapcount()

Commit Message

Andrew Morton Aug. 7, 2020, 6:19 a.m. UTC

From: John Hubbard <[e-mail]>
Subject: 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.

Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: John Hubbard <[e-mail]>
Reported-by: Qian Cai <[e-mail]>
Suggested-by: Matthew Wilcox <[e-mail]>
Acked-by: Vlastimil Babka <[e-mail]>
Cc: Kirill A. Shutemov <[e-mail]>
Cc: Mike Rapoport <[e-mail]>
Cc: William Kucharski <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 include/linux/mm.h |   14 ++++++++++++--
 mm/debug.c         |    6 +++---
 2 files changed, 15 insertions(+), 5 deletions(-)

Patch

--- a/include/linux/mm.h~mm-dump_page-do-not-crash-with-bad-compound_mapcount
+++ a/include/linux/mm.h
@@ -779,6 +779,11 @@  static inline void *kvcalloc(size_t n, s
 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(stru
 {
 	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_availa
 	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)
--- a/mm/debug.c~mm-dump_page-do-not-crash-with-bad-compound_mapcount
+++ a/mm/debug.c
@@ -102,12 +102,12 @@  void __dump_page(struct page *page, cons
 		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))