[linux-lvm] [PATCH 2/3] Disable lvm2 udev rules if `dmsetup splitname` fails

Demi Marie Obenour demi at invisiblethingslab.com
Mon Apr 4 21:55:13 UTC 2022

If the output of `dmsetup splitname` cannot be trusted, the safest
option is to disable all lvm2 rules.
 udev/11-dm-lvm.rules.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/udev/11-dm-lvm.rules.in b/udev/11-dm-lvm.rules.in
index 7c58994..f7066b7 100644
--- a/udev/11-dm-lvm.rules.in
+++ b/udev/11-dm-lvm.rules.in
@@ -18,7 +18,7 @@ ENV{DM_UDEV_RULES_VSN}!="?*", GOTO="lvm_end"
 ENV{DM_UUID}!="LVM-?*", GOTO="lvm_end"
 # Use DM name and split it up into its VG/LV/layer constituents.
-IMPORT{program}="(DM_EXEC)/dmsetup splitname --nameprefixes --noheadings --rows $env{DM_NAME}"
+IMPORT{program}!="(DM_EXEC)/dmsetup splitname --nameprefixes --noheadings --rows $env{DM_NAME}", GOTO="lvm_disable"
 # DM_SUBSYSTEM_UDEV_FLAG0 is the 'NOSCAN' flag for LVM subsystem.
 # This flag is used to temporarily disable selected rules to prevent any
Demi Marie Obenour (she/her/hers)
Invisible Things Lab

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