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| author | Ryusuke Konishi <konishi.ryusuke@gmail.com> | 2023-08-05 16:20:38 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-21 23:07:21 +0300 |
| commit | f83913f8c5b882a312e72b7669762f8a5c9385e4 (patch) | |
| tree | 6076dbd4064da7d78d992a687b7ca58712c5d483 /tools | |
| parent | 5805192c7b7257d290474cb1a3897d0567281bbc (diff) | |
| download | linux-f83913f8c5b882a312e72b7669762f8a5c9385e4.tar.xz | |
nilfs2: fix general protection fault in nilfs_lookup_dirty_data_buffers()
A syzbot stress test reported that create_empty_buffers() called from
nilfs_lookup_dirty_data_buffers() can cause a general protection fault.
Analysis using its reproducer revealed that the back reference "mapping"
from a page/folio has been changed to NULL after dirty page/folio gang
lookup in nilfs_lookup_dirty_data_buffers().
Fix this issue by excluding pages/folios from being collected if, after
acquiring a lock on each page/folio, its back reference "mapping" differs
from the pointer to the address space struct that held the page/folio.
Link: https://lkml.kernel.org/r/20230805132038.6435-1-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Reported-by: syzbot+0ad741797f4565e7e2d2@syzkaller.appspotmail.com
Closes: https://lkml.kernel.org/r/0000000000002930a705fc32b231@google.com
Tested-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions