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authorVlastimil Babka <vbabka@suse.cz>2022-11-04 17:57:26 +0300
committerVlastimil Babka <vbabka@suse.cz>2022-11-21 12:24:00 +0300
commit8b8817630ae80032e80b2eaf334de756ac1ff6a3 (patch)
treefab22d22b71a833fce49e3d74e5c6527076e6983 /mm/migrate.c
parentbc29d5bd2ba977716e57572030290d6547ff3f6d (diff)
downloadlinux-8b8817630ae80032e80b2eaf334de756ac1ff6a3.tar.xz
mm/migrate: make isolate_movable_page() skip slab pages
In the next commit we want to rearrange struct slab fields to allow a larger rcu_head. Afterwards, the page->mapping field will overlap with SLUB's "struct list_head slab_list", where the value of prev pointer can become LIST_POISON2, which is 0x122 + POISON_POINTER_DELTA. Unfortunately the bit 1 being set can confuse PageMovable() to be a false positive and cause a GPF as reported by lkp [1]. To fix this, make isolate_movable_page() skip pages with the PageSlab flag set. This is a bit tricky as we need to add memory barriers to SLAB and SLUB's page allocation and freeing, and their counterparts to isolate_movable_page(). Based on my RFC from [2]. Added a comment update from Matthew's variant in [3] and, as done there, moved the PageSlab checks to happen before trying to take the page lock. [1] https://lore.kernel.org/all/208c1757-5edd-fd42-67d4-1940cc43b50f@intel.com/ [2] https://lore.kernel.org/all/aec59f53-0e53-1736-5932-25407125d4d4@suse.cz/ [3] https://lore.kernel.org/all/YzsVM8eToHUeTP75@casper.infradead.org/ Reported-by: kernel test robot <yujie.liu@intel.com> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Diffstat (limited to 'mm/migrate.c')
-rw-r--r--mm/migrate.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 1379e1912772..959c99cff814 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -74,13 +74,22 @@ int isolate_movable_page(struct page *page, isolate_mode_t mode)
if (unlikely(!get_page_unless_zero(page)))
goto out;
+ if (unlikely(PageSlab(page)))
+ goto out_putpage;
+ /* Pairs with smp_wmb() in slab freeing, e.g. SLUB's __free_slab() */
+ smp_rmb();
/*
- * Check PageMovable before holding a PG_lock because page's owner
- * assumes anybody doesn't touch PG_lock of newly allocated page
- * so unconditionally grabbing the lock ruins page's owner side.
+ * Check movable flag before taking the page lock because
+ * we use non-atomic bitops on newly allocated page flags so
+ * unconditionally grabbing the lock ruins page's owner side.
*/
if (unlikely(!__PageMovable(page)))
goto out_putpage;
+ /* Pairs with smp_wmb() in slab allocation, e.g. SLUB's alloc_slab_page() */
+ smp_rmb();
+ if (unlikely(PageSlab(page)))
+ goto out_putpage;
+
/*
* As movable pages are not isolated from LRU lists, concurrent
* compaction threads can race against page migration functions