linux-kernel - [PATCH 3.2 80/94] mm: try_to_unmap_cluster() should lock

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Message-ID: <lsq.1398647482.469240383@decadent.org.uk>
Date:	Mon, 28 Apr 2014 02:11:22 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Wanpeng Li" <liwanp@...ux.vnet.ibm.com>,
	"Bob Liu" <bob.liu@...cle.com>,
	"Sasha Levin" <sasha.levin@...cle.com>,
	"Vlastimil Babka" <vbabka@...e.cz>, "Mel Gorman" <mgorman@...e.de>,
	"Rik van Riel" <riel@...hat.com>,
	"Joonsoo Kim" <iamjoonsoo.kim@....com>,
	"Hugh Dickins" <hughd@...gle.com>,
	"Michel Lespinasse" <walken@...gle.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	"David Rientjes" <rientjes@...gle.com>
Subject: [PATCH 3.2 80/94] mm: try_to_unmap_cluster() should lock_page()
 before mlocking

3.2.58-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Vlastimil Babka <vbabka@...e.cz>

commit 57e68e9cd65b4b8eb4045a1e0d0746458502554c upstream.

A BUG_ON(!PageLocked) was triggered in mlock_vma_page() by Sasha Levin
fuzzing with trinity.  The call site try_to_unmap_cluster() does not lock
the pages other than its check_page parameter (which is already locked).

The BUG_ON in mlock_vma_page() is not documented and its purpose is
somewhat unclear, but apparently it serializes against page migration,
which could otherwise fail to transfer the PG_mlocked flag.  This would
not be fatal, as the page would be eventually encountered again, but
NR_MLOCK accounting would become distorted nevertheless.  This patch adds
a comment to the BUG_ON in mlock_vma_page() and munlock_vma_page() to that
effect.

The call site try_to_unmap_cluster() is fixed so that for page !=
check_page, trylock_page() is attempted (to avoid possible deadlocks as we
already have check_page locked) and mlock_vma_page() is performed only
upon success.  If the page lock cannot be obtained, the page is left
without PG_mlocked, which is again not a problem in the whole unevictable
memory design.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
Signed-off-by: Bob Liu <bob.liu@...cle.com>
Reported-by: Sasha Levin <sasha.levin@...cle.com>
Cc: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc: Michel Lespinasse <walken@...gle.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Acked-by: Rik van Riel <riel@...hat.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 mm/mlock.c |  2 ++
 mm/rmap.c  | 14 ++++++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -78,6 +78,7 @@ void __clear_page_mlock(struct page *pag
  */
 void mlock_vma_page(struct page *page)
 {
+	/* Serialize with page migration */
 	BUG_ON(!PageLocked(page));
 
 	if (!TestSetPageMlocked(page)) {
@@ -105,6 +106,7 @@ void mlock_vma_page(struct page *page)
  */
 void munlock_vma_page(struct page *page)
 {
+	/* For try_to_munlock() and to serialize with page migration */
 	BUG_ON(!PageLocked(page));
 
 	if (TestClearPageMlocked(page)) {
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1385,9 +1385,19 @@ static int try_to_unmap_cluster(unsigned
 		BUG_ON(!page || PageAnon(page));
 
 		if (locked_vma) {
-			mlock_vma_page(page);   /* no-op if already mlocked */
-			if (page == check_page)
+			if (page == check_page) {
+				/* we know we have check_page locked */
+				mlock_vma_page(page);
 				ret = SWAP_MLOCK;
+			} else if (trylock_page(page)) {
+				/*
+				 * If we can lock the page, perform mlock.
+				 * Otherwise leave the page alone, it will be
+				 * eventually encountered again later.
+				 */
+				mlock_vma_page(page);
+				unlock_page(page);
+			}
 			continue;	/* don't unmap */
 		}
 

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