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ZVOLs should not be allowed to have children

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zfs create, receive and rename can bypass this hierarchy rule. Update
both userland and kernel module to prevent this issue and use pyzfs
unit tests to exercise the ioctls directly.

Note: this commit slightly changes zfs_ioc_create() ABI. This allow to
differentiate a generic error (EINVAL) from the specific case where we
tried to create a dataset below a ZVOL (ZFS_ERR_WRONG_PARENT).

Reviewed-by: Paul Dagnelie <pcd@delphix.com>
Reviewed-by: Matt Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tom Caputi <tcaputi@datto.com>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
This commit is contained in:
loli10K
2019-02-09 00:44:15 +01:00
committed by Matthew Ahrens
parent 4417096956
commit d8d418ff0c
17 changed files with 358 additions and 86 deletions
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module/zfs/dsl_dir.c
+26
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@@ -25,6 +25,7 @@
* Copyright (c) 2014 Joyent, Inc. All rights reserved.
* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
* Copyright (c) 2016 Actifio, Inc. All rights reserved.
* Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
*/
#include <sys/dmu.h>
@@ -1888,6 +1889,8 @@ dsl_dir_rename_check(void *arg, dmu_tx_t *tx)
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dir_t *dd, *newparent;
dsl_valid_rename_arg_t dvra;
dsl_dataset_t *parentds;
objset_t *parentos;
const char *mynewname;
int error;
@@ -1918,6 +1921,29 @@ dsl_dir_rename_check(void *arg, dmu_tx_t *tx)
return (SET_ERROR(EEXIST));
}
/* can't rename below anything but filesystems (eg. no ZVOLs) */
error = dsl_dataset_hold_obj(newparent->dd_pool,
dsl_dir_phys(newparent)->dd_head_dataset_obj, FTAG, &parentds);
if (error != 0) {
dsl_dir_rele(newparent, FTAG);
dsl_dir_rele(dd, FTAG);
return (error);
}
error = dmu_objset_from_ds(parentds, &parentos);
if (error != 0) {
dsl_dataset_rele(parentds, FTAG);
dsl_dir_rele(newparent, FTAG);
dsl_dir_rele(dd, FTAG);
return (error);
}
if (dmu_objset_type(parentos) != DMU_OST_ZFS) {
dsl_dataset_rele(parentds, FTAG);
dsl_dir_rele(newparent, FTAG);
dsl_dir_rele(dd, FTAG);
return (SET_ERROR(ZFS_ERR_WRONG_PARENT));
}
dsl_dataset_rele(parentds, FTAG);
ASSERT3U(strnlen(ddra->ddra_newname, ZFS_MAX_DATASET_NAME_LEN),
<, ZFS_MAX_DATASET_NAME_LEN);
ASSERT3U(strnlen(ddra->ddra_oldname, ZFS_MAX_DATASET_NAME_LEN),