diff options
| author | Qu Wenruo <wqu@suse.com> | 2021-07-26 14:35:03 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2021-08-23 13:19:05 +0200 |
| commit | 7c11d0ae439565b4560b0c0f36bf05171ed1a146 (patch) | |
| tree | fb8e7d8a2cb1714ecb90caaf62cafd29e8103546 /fs/btrfs/file.c | |
| parent | e0467866198f7f536806f39e5d0d91ae8018de08 (diff) | |
btrfs: subpage: fix a potential use-after-free in writeback helper
[BUG]
There is a possible use-after-free bug when running generic/095.
BUG: Unable to handle kernel data access on write at 0x6b6b6b6b6b6b725b
Faulting instruction address: 0xc000000000283654
c000000000283078 do_raw_spin_unlock+0x88/0x230
c0000000012b1e14 _raw_spin_unlock_irqrestore+0x44/0x90
c000000000a918dc btrfs_subpage_clear_writeback+0xac/0xe0
c0000000009e0458 end_bio_extent_writepage+0x158/0x270
c000000000b6fd14 bio_endio+0x254/0x270
c0000000009fc0f0 btrfs_end_bio+0x1a0/0x200
c000000000b6fd14 bio_endio+0x254/0x270
c000000000b781fc blk_update_request+0x46c/0x670
c000000000b8b394 blk_mq_end_request+0x34/0x1d0
c000000000d82d1c lo_complete_rq+0x11c/0x140
c000000000b880a4 blk_complete_reqs+0x84/0xb0
c0000000012b2ca4 __do_softirq+0x334/0x680
c0000000001dd878 irq_exit+0x148/0x1d0
c000000000016f4c do_IRQ+0x20c/0x240
c000000000009240 hardware_interrupt_common_virt+0x1b0/0x1c0
[CAUSE]
There is very small race window like the following in generic/095.
Thread 1 | Thread 2
--------------------------------+------------------------------------
end_bio_extent_writepage() | btrfs_releasepage()
|- spin_lock_irqsave() | |
|- end_page_writeback() | |
| | |- if (PageWriteback() ||...)
| | |- clear_page_extent_mapped()
| | |- kfree(subpage);
|- spin_unlock_irqrestore().
The race can also happen between writeback and btrfs_invalidatepage(),
although that would be much harder as btrfs_invalidatepage() has much
more work to do before the clear_page_extent_mapped() call.
[FIX]
Here we "wait" for the subapge spinlock to be released before we detach
subpage structure.
So this patch will introduce a new function, wait_subpage_spinlock(), to
do the "wait" by acquiring the spinlock and release it.
Since the caller has ensured the page is not dirty nor writeback, and
page is already locked, the only way to hold the subpage spinlock is
from endio function.
Thus we only need to acquire the spinlock to wait for any existing
holder.
Reported-by: Ritesh Harjani <riteshh@linux.ibm.com>
Tested-by: Ritesh Harjani <riteshh@linux.ibm.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/file.c')
| -rw-r--r-- | fs/btrfs/file.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 8c57af3702fa..d3f2623a2af0 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1343,10 +1343,10 @@ static int prepare_uptodate_page(struct inode *inode, /* * Since btrfs_readpage() will unlock the page before it - * returns, there is a window where btrfs_releasepage() can - * be called to release the page. - * Here we check both inode mapping and PagePrivate() to - * make sure the page was not released. + * returns, there is a window where btrfs_releasepage() can be + * called to release the page. Here we check both inode + * mapping and PagePrivate() to make sure the page was not + * released. * * The private flag check is essential for subpage as we need * to store extra bitmap using page->private. |