Commit Message
Greg KH
Oct. 24, 2022, 11:29 a.m. UTC
From: Hu Weiwen <sehuww@mail.scut.edu.cn> commit 7cb9994754f8a36ae9e5ec4597c5c4c2d6c03832 upstream. Clear O_TRUNC from the flags sent in the MDS create request. `atomic_open' is called before permission check. We should not do any modification to the file here. The caller will do the truncation afterward. Fixes: 124e68e74099 ("ceph: file operations") Signed-off-by: Hu Weiwen <sehuww@mail.scut.edu.cn> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> [Xiubo: fixed a trivial conflict for 4.9 backport] Signed-off-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- fs/ceph/file.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -354,6 +354,11 @@ int ceph_atomic_open(struct inode *dir, err = ceph_init_dentry(dentry); if (err < 0) return err; + /* + * Do not truncate the file, since atomic_open is called before the + * permission check. The caller will do the truncation afterward. + */ + flags &= ~O_TRUNC; if (flags & O_CREAT) { err = ceph_pre_init_acls(dir, &mode, &acls); @@ -384,9 +389,7 @@ int ceph_atomic_open(struct inode *dir, req->r_args.open.mask = cpu_to_le32(mask); req->r_locked_dir = dir; /* caller holds dir->i_mutex */ - err = ceph_mdsc_do_request(mdsc, - (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, - req); + err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req); err = ceph_handle_snapdir(req, dentry, err); if (err) goto out_req;