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| author |   Ming Lei <ming.lei@redhat.com> | 2021-09-23 10:37:51 +0800 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-09-24 11:06:58 -0600 |
| commit | f278eb3d8178f9c31f8dfad7e91440e603dd7f1a (patch) | |
| tree | 86c4b040a5325188562ef075c9256d32de6fdff7 /scripts/gdb/linux/utils.py | |
| parent | blktrace: Fix uaf in blk_trace access after removing by sysfs (diff) | |
| download | wireguard-linux-f278eb3d8178f9c31f8dfad7e91440e603dd7f1a.tar.xz wireguard-linux-f278eb3d8178f9c31f8dfad7e91440e603dd7f1a.zip | |
block: hold ->invalidate_lock in blkdev_fallocate
When running ->fallocate(), blkdev_fallocate() should hold
mapping->invalidate_lock to prevent page cache from being accessed,
otherwise stale data may be read in page cache.
Without this patch, blktests block/009 fails sometimes. With this patch,
block/009 can pass always.
Also as Jan pointed out, no pages can be created in the discarded area
while you are holding the invalidate_lock, so remove the 2nd
truncate_bdev_range().
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20210923023751.1441091-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'scripts/gdb/linux/utils.py')
0 files changed, 0 insertions, 0 deletions