Re: [PATCH] mm: migrate: fix data-race in migrate_folio_unmap()

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On 22.09.24 17:17, Jeongjun Park wrote:
I found a report from syzbot [1]

When __folio_test_movable() is called in migrate_folio_unmap() to read
folio->mapping, a data race occurs because the folio is read without
protecting it with folio_lock.

This can cause unintended behavior because folio->mapping is initialized
to a NULL value. Therefore, I think it is appropriate to call
__folio_test_movable() under the protection of folio_lock to prevent
data-race.


We hold a folio reference, would we really see PAGE_MAPPING_MOVABLE flip? Hmm

Even a racing __ClearPageMovable() would still leave PAGE_MAPPING_MOVABLE set.

[1]

==================================================================
BUG: KCSAN: data-race in __filemap_remove_folio / migrate_pages_batch

write to 0xffffea0004b81dd8 of 8 bytes by task 6348 on cpu 0:
  page_cache_delete mm/filemap.c:153 [inline]
  __filemap_remove_folio+0x1ac/0x2c0 mm/filemap.c:233
  filemap_remove_folio+0x6b/0x1f0 mm/filemap.c:265
  truncate_inode_folio+0x42/0x50 mm/truncate.c:178
  shmem_undo_range+0x25b/0xa70 mm/shmem.c:1028
  shmem_truncate_range mm/shmem.c:1144 [inline]
  shmem_evict_inode+0x14d/0x530 mm/shmem.c:1272
  evict+0x2f0/0x580 fs/inode.c:731
  iput_final fs/inode.c:1883 [inline]
  iput+0x42a/0x5b0 fs/inode.c:1909
  dentry_unlink_inode+0x24f/0x260 fs/dcache.c:412
  __dentry_kill+0x18b/0x4c0 fs/dcache.c:615
  dput+0x5c/0xd0 fs/dcache.c:857
  __fput+0x3fb/0x6d0 fs/file_table.c:439
  ____fput+0x1c/0x30 fs/file_table.c:459
  task_work_run+0x13a/0x1a0 kernel/task_work.c:228
  resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
  exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
  exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
  __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
  syscall_exit_to_user_mode+0xbe/0x130 kernel/entry/common.c:218
  do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
  entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea0004b81dd8 of 8 bytes by task 6342 on cpu 1:
  __folio_test_movable include/linux/page-flags.h:699 [inline]
  migrate_folio_unmap mm/migrate.c:1199 [inline]
  migrate_pages_batch+0x24c/0x1940 mm/migrate.c:1797
  migrate_pages_sync mm/migrate.c:1963 [inline]
  migrate_pages+0xff1/0x1820 mm/migrate.c:2072
  do_mbind mm/mempolicy.c:1390 [inline]
  kernel_mbind mm/mempolicy.c:1533 [inline]
  __do_sys_mbind mm/mempolicy.c:1607 [inline]
  __se_sys_mbind+0xf76/0x1160 mm/mempolicy.c:1603
  __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1603
  x64_sys_call+0x2b4d/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:238
  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
  do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
  entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888127601078 -> 0x0000000000000000

Note that this doesn't flip PAGE_MAPPING_MOVABLE, just some unrelated bits.


Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 7e2a5e5ab217 ("mm: migrate: use __folio_test_movable()")
Signed-off-by: Jeongjun Park <aha310510@xxxxxxxxx>
---
  mm/migrate.c | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 923ea80ba744..e62dac12406b 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1118,7 +1118,7 @@ static int migrate_folio_unmap(new_folio_t get_new_folio,
  	int rc = -EAGAIN;
  	int old_page_state = 0;
  	struct anon_vma *anon_vma = NULL;
-	bool is_lru = !__folio_test_movable(src);
+	bool is_lru;
  	bool locked = false;
  	bool dst_locked = false;
@@ -1172,6 +1172,7 @@ static int migrate_folio_unmap(new_folio_t get_new_folio,
  	locked = true;
  	if (folio_test_mlocked(src))
  		old_page_state |= PAGE_WAS_MLOCKED;
+	is_lru = !__folio_test_movable(src);


Looks straight forward, though

Acked-by: David Hildenbrand <david@xxxxxxxxxx>


--
Cheers,

David / dhildenb





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