introduce new LSM hooks where vfsmount is available.

Add new LSM hooks for path-based checks.  Call them on directory-modifying
operations at the points where we still know the vfsmount involved.

Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index c6250d0055d2..d1b89820ab4f 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -836,7 +836,11 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
                 err = mnt_want_write(nd.path.mnt);
                 if (err)
                         goto out_mknod_dput;
+                err = security_path_mknod(&nd.path, dentry, mode, 0);
+                if (err)
+                        goto out_mknod_drop_write;
                 err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, 0);
+out_mknod_drop_write:
                 mnt_drop_write(nd.path.mnt);
                 if (err)
                         goto out_mknod_dput;