[pve-devel] [PATCH storage] ZFSPlugin: untaint lun number
Stoiko Ivanov
s.ivanov at proxmox.com
Fri Oct 9 17:13:44 CEST 2020
ZFS over iSCSI fetches information about the disk-images via ssh, thus
the obtainted data is tainted (perlsec (1)).
Since pvedaemon runs with '-T' enabled trying to start a VM via GUI/API failed,
while it still worked via `qm` or `pvesh`.
The issue surfaced after commit cb9db10c1a9855cf40ff13e81f9dd97d6a9b2698 in
pve-common ('run_command: improve performance for logging and long lines'),
and results from concatenating the original (tainted) buffer to a variable,
instead of a captured subgroup.
Untainting the value in ZFSPlugin should not cause any regressiosn, since the
other 3 target providers already have a match on '\d+' for retrieving the
lun number.
reported via pve-user [0].
reproduced and tested by setting up a LIO-target (on top of a virtual PVE),
adding it as storage and trying to start a guest (with a disk on the
ZFS over iSCSI storage) with `perl -T /usr/sbin/qm start $vmid`
[0] https://lists.proxmox.com/pipermail/pve-user/2020-October/172055.html
Signed-off-by: Stoiko Ivanov <s.ivanov at proxmox.com>
---
PVE/Storage/ZFSPlugin.pm | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/PVE/Storage/ZFSPlugin.pm b/PVE/Storage/ZFSPlugin.pm
index 383f0a0..63b9551 100644
--- a/PVE/Storage/ZFSPlugin.pm
+++ b/PVE/Storage/ZFSPlugin.pm
@@ -159,7 +159,11 @@ sub zfs_get_lun_number {
die "could not find lun_number for guid $guid" if !$guid;
- return $class->zfs_request($scfg, undef, 'list_view', $guid);
+ if ($class->zfs_request($scfg, undef, 'list_view', $guid) =~ /^(\d+)$/) {
+ return $1;
+ }
+
+ die "lun_number for guid $guid is not a number";
}
# Configuration
--
2.20.1
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