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Commit ce2728aa authored by Yan, Zheng's avatar Yan, Zheng Committed by Ilya Dryomov
Browse files

ceph: avoid accessing / when mounting a subpath 



Accessing / causes failuire if the client has caps that restrict path

Signed-off-by: default avatarYan, Zheng <zyan@redhat.com>
parent db4a63aa

fs/ceph/super.c

+20 −29
Original line number Diff line number Diff line
@@ -396,11 +396,13 @@ static int parse_mount_options(struct ceph_mount_options **pfsopt, 
	 */

	dev_name_end = strchr(dev_name, '/');

	if (dev_name_end) {

		if (strlen(dev_name_end) > 1) {

			fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);

			if (!fsopt->server_path) {

				err = -ENOMEM;

				goto out;

			}

		}

	} else {

		dev_name_end = dev_name + strlen(dev_name);

	}
@@ -788,16 +790,11 @@ static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 
		struct inode *inode = req->r_target_inode;

		req->r_target_inode = NULL;

		dout("open_root_inode success\n");

		if (ceph_ino(inode) == CEPH_INO_ROOT &&

		    fsc->sb->s_root == NULL) {

		root = d_make_root(inode);

		if (!root) {

			root = ERR_PTR(-ENOMEM);

			goto out;

		}

		} else {

			root = d_obtain_root(inode);

		}

		ceph_init_dentry(root);

		dout("open_root_inode success, root dentry is %p\n", root);

	} else {
@@ -825,17 +822,24 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc) 
	mutex_lock(&fsc->client->mount_mutex);



	if (!fsc->sb->s_root) {

		const char *path;

		err = __ceph_open_session(fsc->client, started);

		if (err < 0)

			goto out;



		dout("mount opening root\n");

		root = open_root_dentry(fsc, "", started);

		if (!fsc->mount_options->server_path) {

			path = "";

			dout("mount opening path \\t\n");

		} else {

			path = fsc->mount_options->server_path + 1;

			dout("mount opening path %s\n", path);

		}

		root = open_root_dentry(fsc, path, started);

		if (IS_ERR(root)) {

			err = PTR_ERR(root);

			goto out;

		}

		fsc->sb->s_root = root;

		fsc->sb->s_root = dget(root);

		first = 1;



		err = ceph_fs_debugfs_init(fsc);
@@ -843,19 +847,6 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc) 
			goto fail;

	}



	if (!fsc->mount_options->server_path) {

		root = fsc->sb->s_root;

		dget(root);

	} else {

		const char *path = fsc->mount_options->server_path + 1;

		dout("mount opening path %s\n", path);

		root = open_root_dentry(fsc, path, started);

		if (IS_ERR(root)) {

			err = PTR_ERR(root);

			goto fail;

		}

	}



	fsc->mount_state = CEPH_MOUNT_MOUNTED;

	dout("mount success\n");

	mutex_unlock(&fsc->client->mount_mutex);