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| author | Benjamin Coddington <bcodding@redhat.com> | 2018-10-03 17:18:33 +0300 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-11-12 10:02:34 +0300 |
| commit | 1e9c75fb9c47a75a9aec0cd17db5f6dc36b58e00 (patch) | |
| tree | 2a733b754464fc47febe6fe332b9cdf75427b0fc /fs/namespace.c | |
| parent | 9c8e0a1b683525464a2abe9fb4b54404a50ed2b4 (diff) | |
| download | linux-1e9c75fb9c47a75a9aec0cd17db5f6dc36b58e00.tar.xz | |
mnt: fix __detach_mounts infinite loop
Since commit ff17fa561a04 ("d_invalidate(): unhash immediately")
immediately unhashes the dentry, we'll never return the mountpoint in
lookup_mountpoint(), which can lead to an unbreakable loop in
d_invalidate().
I have reports of NFS clients getting into this condition after the server
removes an export of an existing mount created through follow_automount(),
but I suspect there are various other ways to produce this problem if we
hunt down users of d_invalidate(). For example, it is possible to get into
this state by using XFS' d_invalidate() call in xfs_vn_unlink():
truncate -s 100m img{1,2}
mkfs.xfs -q -n version=ci img1
mkfs.xfs -q -n version=ci img2
mkdir -p /mnt/xfs
mount img1 /mnt/xfs
mkdir /mnt/xfs/sub1
mount img2 /mnt/xfs/sub1
cat > /mnt/xfs/sub1/foo &
umount -l /mnt/xfs/sub1
mount img2 /mnt/xfs/sub1
mount --make-private /mnt/xfs
mkdir /mnt/xfs/sub2
mount --move /mnt/xfs/sub1 /mnt/xfs/sub2
rmdir /mnt/xfs/sub1
Fix this by moving the check for an unlinked dentry out of the
detach_mounts() path.
Fixes: ff17fa561a04 ("d_invalidate(): unhash immediately")
Cc: stable@vger.kernel.org
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'fs/namespace.c')
| -rw-r--r-- | fs/namespace.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index 74f64294a410..a7f91265ea67 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -695,9 +695,6 @@ static struct mountpoint *lookup_mountpoint(struct dentry *dentry) hlist_for_each_entry(mp, chain, m_hash) { if (mp->m_dentry == dentry) { - /* might be worth a WARN_ON() */ - if (d_unlinked(dentry)) - return ERR_PTR(-ENOENT); mp->m_count++; return mp; } @@ -711,6 +708,9 @@ static struct mountpoint *get_mountpoint(struct dentry *dentry) int ret; if (d_mountpoint(dentry)) { + /* might be worth a WARN_ON() */ + if (d_unlinked(dentry)) + return ERR_PTR(-ENOENT); mountpoint: read_seqlock_excl(&mount_lock); mp = lookup_mountpoint(dentry); |