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authorRyan Moeller <freqlabs@FreeBSD.org>2020-03-25 15:56:18 +0000
committerRyan Moeller <freqlabs@FreeBSD.org>2020-03-25 15:56:18 +0000
commit69534635ff48af494aaef3c8d6c9381577f7b423 (patch)
tree50fc0866287daa7111a705d11e596f3c8fb29581 /cddl/contrib/opensolaris
parent24187cfe72a2d16140422f9babc32d21af4e91b3 (diff)
downloadsrc-69534635ff48af494aaef3c8d6c9381577f7b423.tar.gz
src-69534635ff48af494aaef3c8d6c9381577f7b423.zip
MFOpenZFS: ZVOLs should not be allowed to have children
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> Approved by: mav (mentor) MFC after: 2 weeks Sponsored by: iXsystems, Inc. openzfs/zfs@d8d418ff0cc90776182534bce10b01e9487b63e4
Notes
Notes: svn path=/head/; revision=359303
Diffstat (limited to 'cddl/contrib/opensolaris')
-rw-r--r--cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h1
-rw-r--r--cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c5
-rw-r--r--cddl/contrib/opensolaris/lib/libzfs/common/libzfs_sendrecv.c38
-rw-r--r--cddl/contrib/opensolaris/lib/libzfs/common/libzfs_util.c5
4 files changed, 44 insertions, 5 deletions
diff --git a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h
index 0e53743b1a00..f5dbe7209db6 100644
--- a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h
+++ b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h
@@ -141,6 +141,7 @@ typedef enum zfs_error {
EZFS_TOOMANY, /* argument list too long */
EZFS_INITIALIZING, /* currently initializing */
EZFS_NO_INITIALIZE, /* no active initialize */
+ EZFS_WRONG_PARENT, /* invalid parent dataset (e.g ZVOL) */
EZFS_UNKNOWN
} zfs_error_t;
diff --git a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c
index e0728e3b6285..7075d060c78d 100644
--- a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c
+++ b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c
@@ -3654,11 +3654,6 @@ zfs_create(libzfs_handle_t *hdl, const char *path, zfs_type_t type,
"no such parent '%s'"), parent);
return (zfs_error(hdl, EZFS_NOENT, errbuf));
- case EINVAL:
- zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
- "parent '%s' is not a filesystem"), parent);
- return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
-
case ENOTSUP:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"pool must be upgraded to set this "
diff --git a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_sendrecv.c b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_sendrecv.c
index a4539f6d6e4b..e6f654b25b5f 100644
--- a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_sendrecv.c
+++ b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_sendrecv.c
@@ -28,6 +28,7 @@
* Copyright 2015, OmniTI Computer Consulting, Inc. All rights reserved.
* Copyright (c) 2014 Integros [integros.com]
* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
+ * Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
* Copyright (c) 2019 Datto Inc.
*/
@@ -3375,6 +3376,7 @@ zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
* - we are resuming a failed receive.
*/
if (stream_wantsnewfs) {
+ boolean_t is_volume = drrb->drr_type == DMU_OST_ZVOL;
if (!flags->force) {
zcmd_free_nvlists(&zc);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
@@ -3392,6 +3394,25 @@ zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
zc.zc_name);
return (zfs_error(hdl, EZFS_EXISTS, errbuf));
}
+ if (is_volume && strrchr(zc.zc_name, '/') == NULL) {
+ zcmd_free_nvlists(&zc);
+ zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+ "destination '%s' is the root dataset\n"
+ "cannot overwrite with a ZVOL"),
+ zc.zc_name);
+ return (zfs_error(hdl, EZFS_EXISTS, errbuf));
+ }
+ if (is_volume &&
+ ioctl(hdl->libzfs_fd, ZFS_IOC_DATASET_LIST_NEXT,
+ &zc) == 0) {
+ zcmd_free_nvlists(&zc);
+ zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+ "destination has children (eg. %s)\n"
+ "cannot overwrite with a ZVOL"),
+ zc.zc_name);
+ return (zfs_error(hdl, EZFS_WRONG_PARENT,
+ errbuf));
+ }
}
if ((zhp = zfs_open(hdl, zc.zc_name,
@@ -3441,6 +3462,8 @@ zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
zfs_close(zhp);
} else {
+ zfs_handle_t *zhp;
+
/*
* Destination filesystem does not exist. Therefore we better
* be creating a new filesystem (either from a full backup, or
@@ -3468,6 +3491,21 @@ zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
return (zfs_error(hdl, EZFS_BADRESTORE, errbuf));
}
+ /* validate parent */
+ zhp = zfs_open(hdl, zc.zc_name, ZFS_TYPE_DATASET);
+ if (zhp == NULL) {
+ zcmd_free_nvlists(&zc);
+ return (zfs_error(hdl, EZFS_BADRESTORE, errbuf));
+ }
+ if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
+ zcmd_free_nvlists(&zc);
+ zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+ "parent '%s' is not a filesystem"), zc.zc_name);
+ zfs_close(zhp);
+ return (zfs_error(hdl, EZFS_WRONG_PARENT, errbuf));
+ }
+ zfs_close(zhp);
+
newfs = B_TRUE;
}
diff --git a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_util.c b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_util.c
index 8ba496abae33..e69467397fc8 100644
--- a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_util.c
+++ b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_util.c
@@ -265,6 +265,8 @@ libzfs_error_description(libzfs_handle_t *hdl)
case EZFS_NO_INITIALIZE:
return (dgettext(TEXT_DOMAIN, "there is no active "
"initialization"));
+ case EZFS_WRONG_PARENT:
+ return (dgettext(TEXT_DOMAIN, "invalid parent dataset"));
case EZFS_UNKNOWN:
return (dgettext(TEXT_DOMAIN, "unknown error"));
default:
@@ -537,6 +539,9 @@ zpool_standard_error_fmt(libzfs_handle_t *hdl, int error, const char *fmt, ...)
case ZFS_ERR_VDEV_TOO_BIG:
zfs_verror(hdl, EZFS_VDEV_TOO_BIG, fmt, ap);
break;
+ case ZFS_ERR_WRONG_PARENT:
+ zfs_verror(hdl, EZFS_WRONG_PARENT, fmt, ap);
+ break;
default:
zfs_error_aux(hdl, strerror(error));
zfs_verror(hdl, EZFS_UNKNOWN, fmt, ap);