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| author | Amir Goldstein <amir73il@gmail.com> | 2022-01-20 23:53:05 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2022-01-24 14:17:02 +0100 |
| commit | 29044dae2e746949ad4b9cbdbfb248994d1dcdb4 (patch) | |
| tree | f7480a05b92c6d395836774ed3a52fb4bb5a3404 /fs/devpts | |
| parent | a37d9a17f099072fe4d3a9048b0321978707a918 (diff) | |
| download | linux-29044dae2e746949ad4b9cbdbfb248994d1dcdb4.tar.bz2 | |
fsnotify: fix fsnotify hooks in pseudo filesystems
Commit 49246466a989 ("fsnotify: move fsnotify_nameremove() hook out of
d_delete()") moved the fsnotify delete hook before d_delete() so fsnotify
will have access to a positive dentry.
This allowed a race where opening the deleted file via cached dentry
is now possible after receiving the IN_DELETE event.
To fix the regression in pseudo filesystems, convert d_delete() calls
to d_drop() (see commit 46c46f8df9aa ("devpts_pty_kill(): don't bother
with d_delete()") and move the fsnotify hook after d_drop().
Add a missing fsnotify_unlink() hook in nfsdfs that was found during
the audit of fsnotify hooks in pseudo filesystems.
Note that the fsnotify hooks in simple_recursive_removal() follow
d_invalidate(), so they require no change.
Link: https://lore.kernel.org/r/20220120215305.282577-2-amir73il@gmail.com
Reported-by: Ivan Delalande <colona@arista.com>
Link: https://lore.kernel.org/linux-fsdevel/YeNyzoDM5hP5LtGW@visor/
Fixes: 49246466a989 ("fsnotify: move fsnotify_nameremove() hook out of d_delete()")
Cc: stable@vger.kernel.org # v5.3+
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/devpts')
| -rw-r--r-- | fs/devpts/inode.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c index 42e5a766d33c..4f25015aa534 100644 --- a/fs/devpts/inode.c +++ b/fs/devpts/inode.c @@ -621,8 +621,8 @@ void devpts_pty_kill(struct dentry *dentry) dentry->d_fsdata = NULL; drop_nlink(dentry->d_inode); - fsnotify_unlink(d_inode(dentry->d_parent), dentry); d_drop(dentry); + fsnotify_unlink(d_inode(dentry->d_parent), dentry); dput(dentry); /* d_alloc_name() in devpts_pty_new() */ } |