* [linux-lvm] [PATCH 0/3] Make udev rules more robust
@ 2022-04-04 21:51 Demi Marie Obenour
2022-04-04 21:56 ` [linux-lvm] [PATCH 3/3] Disable udev rules if udev flags can't be obtained Demi Marie Obenour
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Demi Marie Obenour @ 2022-04-04 21:51 UTC (permalink / raw)
To: LVM general discussion and development; +Cc: Marek Marczykowski-Górecki
[-- Attachment #1.1: Type: text/plain, Size: 496 bytes --]
This makes the udev rules more robust against various unsafe error
conditions.
Demi Marie Obenour (3):
dmsetup: return non-zero on stdio I/O error
Disable lvm2 udev rules if `dmsetup splitname` fails
Disable udev rules if udev flags can't be obtained
libdm/dm-tools/dmsetup.c | 2 ++
udev/10-dm.rules.in | 2 +-
udev/11-dm-lvm.rules.in | 2 +-
3 files changed, 4 insertions(+), 2 deletions(-)
--
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
[-- Attachment #2: Type: text/plain, Size: 202 bytes --]
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply [flat|nested] 5+ messages in thread* [linux-lvm] [PATCH 3/3] Disable udev rules if udev flags can't be obtained
2022-04-04 21:51 [linux-lvm] [PATCH 0/3] Make udev rules more robust Demi Marie Obenour
@ 2022-04-04 21:56 ` Demi Marie Obenour
2022-04-04 21:58 ` [linux-lvm] [PATCH 1/3] dmsetup: return non-zero on stdio I/O error Demi Marie Obenour
2022-04-04 22:02 ` [linux-lvm] [PATCH 2/3] Disable lvm2 udev rules if `dmsetup splitname` fails Demi Marie Obenour
2 siblings, 0 replies; 5+ messages in thread
From: Demi Marie Obenour @ 2022-04-04 21:56 UTC (permalink / raw)
To: LVM general discussion and development; +Cc: Marek Marczykowski-Górecki
[-- Attachment #1.1: Type: text/plain, Size: 918 bytes --]
In this cased the safest option is to disable most udev rules.
---
udev/10-dm.rules.in | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/udev/10-dm.rules.in b/udev/10-dm.rules.in
index b4fa52a..9fae8df 100644
--- a/udev/10-dm.rules.in
+++ b/udev/10-dm.rules.in
@@ -50,7 +50,7 @@ ACTION!="add|change", GOTO="dm_end"
# These flags are encoded in DM_COOKIE variable that was introduced in
# kernel version 2.6.31. Therefore, we can use this feature with
# kernels >= 2.6.31 only. Cookie is not decoded for remove event.
-ENV{DM_COOKIE}=="?*", IMPORT{program}="(DM_EXEC)/dmsetup udevflags $env{DM_COOKIE}"
+ENV{DM_COOKIE}=="?*", IMPORT{program}!="(DM_EXEC)/dmsetup udevflags $env{DM_COOKIE}", GOTO="dm_disable"
# Rule out easy-to-detect inappropriate events first.
ENV{DISK_RO}=="1", GOTO="dm_disable"
--
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
[-- Attachment #2: Type: text/plain, Size: 202 bytes --]
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply related [flat|nested] 5+ messages in thread* [linux-lvm] [PATCH 1/3] dmsetup: return non-zero on stdio I/O error
2022-04-04 21:51 [linux-lvm] [PATCH 0/3] Make udev rules more robust Demi Marie Obenour
2022-04-04 21:56 ` [linux-lvm] [PATCH 3/3] Disable udev rules if udev flags can't be obtained Demi Marie Obenour
@ 2022-04-04 21:58 ` Demi Marie Obenour
2022-04-04 22:02 ` [linux-lvm] [PATCH 2/3] Disable lvm2 udev rules if `dmsetup splitname` fails Demi Marie Obenour
2 siblings, 0 replies; 5+ messages in thread
From: Demi Marie Obenour @ 2022-04-04 21:58 UTC (permalink / raw)
To: LVM general discussion and development; +Cc: Marek Marczykowski-Górecki
[-- Attachment #1.1: Type: text/plain, Size: 740 bytes --]
If there is an I/O error on stdout, return a non-zero status so that
udev can avoid trusting the values printed. Deeper changes to the
log code are out of scope for this patch.
---
libdm/dm-tools/dmsetup.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libdm/dm-tools/dmsetup.c b/libdm/dm-tools/dmsetup.c
index d01b8f2..0449e40 100644
--- a/libdm/dm-tools/dmsetup.c
+++ b/libdm/dm-tools/dmsetup.c
@@ -7491,5 +7491,7 @@ out:
if (_initial_timestamp)
dm_timestamp_destroy(_initial_timestamp);
+ if (fflush(stdout) || ferror(stdout))
+ return 1;
return (_switches[HELP_ARG] || _switches[VERSION_ARG]) ? 0 : ret;
}
--
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
[-- Attachment #2: Type: text/plain, Size: 202 bytes --]
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [linux-lvm] [PATCH 2/3] Disable lvm2 udev rules if `dmsetup splitname` fails
2022-04-04 21:51 [linux-lvm] [PATCH 0/3] Make udev rules more robust Demi Marie Obenour
2022-04-04 21:56 ` [linux-lvm] [PATCH 3/3] Disable udev rules if udev flags can't be obtained Demi Marie Obenour
2022-04-04 21:58 ` [linux-lvm] [PATCH 1/3] dmsetup: return non-zero on stdio I/O error Demi Marie Obenour
@ 2022-04-04 22:02 ` Demi Marie Obenour
2 siblings, 0 replies; 5+ messages in thread
From: Demi Marie Obenour @ 2022-04-04 22:02 UTC (permalink / raw)
To: LVM general discussion and development; +Cc: Marek Marczykowski-Górecki
[-- Attachment #1.1: Type: text/plain, Size: 967 bytes --]
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
--
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
[-- Attachment #2: Type: text/plain, Size: 202 bytes --]
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [linux-lvm] [PATCH 1/3] dmsetup: return non-zero on stdio I/O error
@ 2022-04-04 21:54 Demi Marie Obenour
0 siblings, 0 replies; 5+ messages in thread
From: Demi Marie Obenour @ 2022-04-04 21:54 UTC (permalink / raw)
To: LVM general discussion and development; +Cc: Marek Marczykowski-Górecki
[-- Attachment #1.1: Type: text/plain, Size: 742 bytes --]
If there is an I/O error on stdout, return a non-zero status so that
udev can avoid trusting the values printed. Deeper changes to the
log code are out of scope for this patch.
---
libdm/dm-tools/dmsetup.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libdm/dm-tools/dmsetup.c b/libdm/dm-tools/dmsetup.c
index d01b8f2..0449e40 100644
--- a/libdm/dm-tools/dmsetup.c
+++ b/libdm/dm-tools/dmsetup.c
@@ -7491,5 +7491,7 @@ out:
if (_initial_timestamp)
dm_timestamp_destroy(_initial_timestamp);
+ if (fflush(stdout) || ferror(stdout))
+ return 1;
return (_switches[HELP_ARG] || _switches[VERSION_ARG]) ? 0 : ret;
}
--
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
[-- Attachment #2: Type: text/plain, Size: 202 bytes --]
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-04-04 22:03 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-04-04 21:51 [linux-lvm] [PATCH 0/3] Make udev rules more robust Demi Marie Obenour
2022-04-04 21:56 ` [linux-lvm] [PATCH 3/3] Disable udev rules if udev flags can't be obtained Demi Marie Obenour
2022-04-04 21:58 ` [linux-lvm] [PATCH 1/3] dmsetup: return non-zero on stdio I/O error Demi Marie Obenour
2022-04-04 22:02 ` [linux-lvm] [PATCH 2/3] Disable lvm2 udev rules if `dmsetup splitname` fails Demi Marie Obenour
2022-04-04 21:54 [linux-lvm] [PATCH 1/3] dmsetup: return non-zero on stdio I/O error Demi Marie Obenour
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).