From dc763b80f4d97cdd878bf19fda4c3197b4b01749 Mon Sep 17 00:00:00 2001 From: Alexander Motin Date: Thu, 22 Feb 2018 01:30:03 +0000 Subject: [PATCH] 8942 zfs promote .../%recv should be an error illumos/illumos-gate@add927f8c8d101e16c23eb9cd270be4fd7edf7d5 Reported on the ZFSonLinux https://github.com/zfsonlinux/zfs/issues/4843, fixed by https://github.com/zfsonlinux/zfs/pull/6339: If we are in the middle of an incremental zfs receive, the child .../%recv will exist. If you concurrently run zfs promote .../%recv, it will "work", but then zfs gets confused. For example, there's no obvious way to destroy the containing filesystem (because it is now a clone of its invisible child). Attempting to do this promote should be an error. We could fix this by having zfs_ioc_promote() check if zc_name contains a %, similar to zfs_ioc_rename(). Reviewed by: Paul Dagnelie Reviewed by: Matthew Ahrens Approved by: Dan McDonald Author: loli10K --- lib/libzfs/common/libzfs_dataset.c | 7 +++++++ uts/common/fs/zfs/zfs_ioctl.c | 12 ++++++++++-- 2 files changed, 17 insertions(+), 2 deletions(-) diff --git a/lib/libzfs/common/libzfs_dataset.c b/lib/libzfs/common/libzfs_dataset.c index 31c8b60f4131..23e689cb9f8d 100644 --- a/lib/libzfs/common/libzfs_dataset.c +++ b/lib/libzfs/common/libzfs_dataset.c @@ -3737,6 +3737,9 @@ zfs_promote(zfs_handle_t *zhp) return (zfs_error(hdl, EZFS_BADTYPE, errbuf)); } + if (!zfs_validate_name(hdl, zhp->zfs_name, zhp->zfs_type, B_TRUE)) + return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); + ret = lzc_promote(zhp->zfs_name, snapname, sizeof (snapname)); if (ret != 0) { @@ -4094,6 +4097,10 @@ zfs_rename(zfs_handle_t *zhp, const char *target, boolean_t recursive, (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, "cannot rename to '%s'"), target); + /* make sure source name is valid */ + if (!zfs_validate_name(hdl, zhp->zfs_name, zhp->zfs_type, B_TRUE)) + return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); + /* * Make sure the target name is valid */ diff --git a/uts/common/fs/zfs/zfs_ioctl.c b/uts/common/fs/zfs/zfs_ioctl.c index ac344f78d75a..4d9556ccaf8f 100644 --- a/uts/common/fs/zfs/zfs_ioctl.c +++ b/uts/common/fs/zfs/zfs_ioctl.c @@ -3758,9 +3758,12 @@ zfs_ioc_rename(zfs_cmd_t *zc) boolean_t recursive = zc->zc_cookie & 1; char *at; + /* "zfs rename" from and to ...%recv datasets should both fail */ + zc->zc_name[sizeof (zc->zc_name) - 1] = '\0'; zc->zc_value[sizeof (zc->zc_value) - 1] = '\0'; - if (dataset_namecheck(zc->zc_value, NULL, NULL) != 0 || - strchr(zc->zc_value, '%')) + if (dataset_namecheck(zc->zc_name, NULL, NULL) != 0 || + dataset_namecheck(zc->zc_value, NULL, NULL) != 0 || + strchr(zc->zc_name, '%') || strchr(zc->zc_value, '%')) return (SET_ERROR(EINVAL)); at = strchr(zc->zc_name, '@'); @@ -4783,6 +4786,11 @@ zfs_ioc_promote(zfs_cmd_t *zc) char *cp; int error; + zc->zc_name[sizeof (zc->zc_name) - 1] = '\0'; + if (dataset_namecheck(zc->zc_name, NULL, NULL) != 0 || + strchr(zc->zc_name, '%')) + return (SET_ERROR(EINVAL)); + error = dsl_pool_hold(zc->zc_name, FTAG, &dp); if (error != 0) return (error);