diff options
| author | Jeff Layton <jlayton@kernel.org> | 2025-11-11 09:12:45 -0500 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-11-12 09:38:35 +0100 |
| commit | e6d28ebc17eb5e011b80c42a5196af0570c12240 (patch) | |
| tree | 66fc5a9e21a386d9306258813cb2ac9e4ab119fd | |
| parent | 6976ed2dd0d59086d16d853ac9b21776be68aaad (diff) | |
| download | linux-e6d28ebc17eb5e011b80c42a5196af0570c12240.tar.gz | |
filelock: push the S_ISREG check down to ->setlease handlers
When nfsd starts requesting directory delegations, setlease handlers may
see requests for leases on directories. Push the !S_ISREG check down
into the non-trivial setlease handlers, so we can selectively enable
them where they're supported.
FUSE is special: It's the only filesystem that supports atomic_open and
allows kernel-internal leases. atomic_open is issued when the VFS
doesn't know the state of the dentry being opened. If the file doesn't
exist, it may be created, in which case the dir lease should be broken.
The existing kernel-internal lease implementation has no provision for
this. Ensure that we don't allow directory leases by default going
forward by explicitly disabling them there.
Reviewed-by: NeilBrown <neil@brown.name>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20251111-dir-deleg-ro-v6-4-52f3feebb2f2@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
| -rw-r--r-- | fs/fuse/dir.c | 1 | ||||
| -rw-r--r-- | fs/locks.c | 5 | ||||
| -rw-r--r-- | fs/nfs/nfs4file.c | 2 | ||||
| -rw-r--r-- | fs/smb/client/cifsfs.c | 3 |
4 files changed, 9 insertions, 2 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index ecaec0fea3a132..667774cc72a1d4 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -2230,6 +2230,7 @@ static const struct file_operations fuse_dir_operations = { .fsync = fuse_dir_fsync, .unlocked_ioctl = fuse_dir_ioctl, .compat_ioctl = fuse_dir_compat_ioctl, + .setlease = simple_nosetlease, }; static const struct inode_operations fuse_common_inode_operations = { diff --git a/fs/locks.c b/fs/locks.c index 3cdd84a0fbedc9..f5b210a2dc34c7 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -1935,6 +1935,9 @@ static int generic_delete_lease(struct file *filp, void *owner) int generic_setlease(struct file *filp, int arg, struct file_lease **flp, void **priv) { + if (!S_ISREG(file_inode(filp)->i_mode)) + return -EINVAL; + switch (arg) { case F_UNLCK: return generic_delete_lease(filp, *priv); @@ -2024,8 +2027,6 @@ vfs_setlease(struct file *filp, int arg, struct file_lease **lease, void **priv) if ((!vfsuid_eq_kuid(vfsuid, current_fsuid())) && !capable(CAP_LEASE)) return -EACCES; - if (!S_ISREG(inode->i_mode)) - return -EINVAL; error = security_file_lock(filp, arg); if (error) return error; diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index 7f43e890d3564a..7317f26892c578 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -431,6 +431,8 @@ void nfs42_ssc_unregister_ops(void) static int nfs4_setlease(struct file *file, int arg, struct file_lease **lease, void **priv) { + if (!S_ISREG(file_inode(file)->i_mode)) + return -EINVAL; return nfs4_proc_setlease(file, arg, lease, priv); } diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c index 05b1fa76e8ccf1..03c44c1d9bb631 100644 --- a/fs/smb/client/cifsfs.c +++ b/fs/smb/client/cifsfs.c @@ -1149,6 +1149,9 @@ cifs_setlease(struct file *file, int arg, struct file_lease **lease, void **priv struct inode *inode = file_inode(file); struct cifsFileInfo *cfile = file->private_data; + if (!S_ISREG(inode->i_mode)) + return -EINVAL; + /* Check if file is oplocked if this is request for new lease */ if (arg == F_UNLCK || ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) || |