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Message #06337
[Bug 2107402] Re: lsblk on IBM z Systems blocked by apparmor in 25.04
Hello Marian, or anyone else affected,
Accepted apparmor into plucky-proposed. The package will build now and
be available at
https://launchpad.net/ubuntu/+source/apparmor/4.1.0~beta5-0ubuntu14.1 in
a few hours, and then in the -proposed repository.
Please help us by testing this new package. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed. Your feedback will aid us getting this
update out to other Ubuntu users.
If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
plucky to verification-done-plucky. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-plucky. In either case, without details of your testing we will
not be able to proceed.
Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance for helping!
N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.
** Changed in: apparmor (Ubuntu Plucky)
Status: In Progress => Fix Committed
** Tags added: verification-needed verification-needed-plucky
--
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https://bugs.launchpad.net/bugs/2107402
Title:
lsblk on IBM z Systems blocked by apparmor in 25.04
Status in Release Notes for Ubuntu:
Fix Released
Status in Ubuntu on IBM z Systems:
In Progress
Status in apparmor package in Ubuntu:
Fix Released
Status in util-linux package in Ubuntu:
Invalid
Status in apparmor source package in Plucky:
Fix Committed
Status in util-linux source package in Plucky:
Invalid
Status in apparmor source package in Questing:
Fix Released
Status in util-linux source package in Questing:
Invalid
Bug description:
SRU Justification:
[ Impact ]
* lsblk on an s390x system that uses DASD disks shows no output.
* journactl shows lsblk is blocked by apparmor:
2025-04-15T15:02:26.048075+00:00 s5lp1-gen03 kernel: audit: type=1400
audit(1744729346.034:270): apparmor="DENIED" operation="open"
class="file" profile="lsblk" name="/sys/devices/css0/
0.0.0000/0.0.0101/block/dasda/hidden" pid=2070 comm="lsblk"
requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
* The reason is that the lsblk profile does not allow access
to /sys/devices/css0.
[ Test Plan ]
* Install Ubuntu Server 25.04 on IBM Z in LPAR, z/VM or KVM
using DASD ECKD disks.
* Please notice that testing this at install time using the installer
shell is not sufficient, since the profile is not active at that time.
* Ensure util-linux and the s390-tools are installed
(which is by default).
* Check if apparmor is enabled and the profile active:
sudo aa-status --enabled
sudo aa-status --show=all | grep lsblk
* Do an lsdasd, it should list DASD ECKD disks, similar to:
$ lsdasd
Bus-ID Status Name Device Type BlkSz Size Blocks
================================================================================
0.0.0200 active dasda 94:0 ECKD 4096 7042MB 1802880
0.0.0300 active dasdb 94:4 ECKD 4096 7042MB 1802880
0.0.0400 active dasdc 94:8 ECKD 4096 21128MB 5409000
* Now execute lsblk (and watch the journal)
- on a system that is not patched,
one will see no output in the Terminal
(or in case of running in a container a segfault),
and messages like this in the journal:
2025-04-15T15:02:26.048075+00:00 hwe0006 kernel: audit: type=1400
audit(1744729346.034:270): apparmor="DENIED" operation="open"
class="file" profile="lsblk" name="/sys/devices/css0/
0.0.0000/0.0.0200/block/dasda/hidden" pid=2070 comm="lsblk"
requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
...
- on a patched system, lsblk should provide a proper output
similar to this:
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 65.4M 1 loop
loop1 7:1 0 65.4M 1 loop /snap/core22/1909
loop2 7:2 0 39.9M 1 loop
loop3 7:3 0 98.7M 1 loop /snap/lxd/32454
loop4 7:4 0 39.9M 1 loop /snap/snapd/23776
loop5 7:5 0 65.4M 1 loop
loop6 7:6 0 100M 1 loop /snap/lxd/33109
loop7 7:7 0 46.2M 1 loop /snap/snapd/24506
loop8 7:8 0 65.4M 1 loop /snap/core22/1965
dasda 94:0 0 20.6G 0 disk
└─dasda1 94:1 0 20.6G 0 part
└─hwe0006--vg-hwe0006--lv 253:0 0 47.1G 0 lvm /
dasdb 94:4 0 6.9G 0 disk
├─dasdb1 94:5 0 1G 0 part /boot
└─dasdb2 94:6 0 5.9G 0 part
└─hwe0006--vg-hwe0006--lv 253:0 0 47.1G 0 lvm /
dasdc 94:8 0 20.6G 0 disk
└─dasdc1 94:9 0 20.6G 0 part
└─hwe0006--vg-hwe0006--lv 253:0 0 47.1G 0 lvm /
* As a regression test, execute lsblk also on a FCP/SCSP
system, to verify that nothing has changed
(since this was not affected).
[ Where problems could occur ]
* This SRU loosens confinement on the lsblk profile. However, if a user
manually modified the installed profiles, then the package upgrade would
cause conflicts, and rejection of the incoming changes (either by hand
during an interactive upgrade or automatically during an batch unattended
upgrade) would result in end users not getting the packaged fix.
* This should not have an impact on other (disk type) devices
like SCSI/FCP, but better check (see test plan, last bullet).
[ Other Info ]
* The modification is already included in questing.
* The patch was tested also successfully tested in plucky on s390x.
__________
Fresh install of 25.04 on s390x. Same happens also on upgrade from
24.10 to 25.04
lsblk returns no output
journactl shows it is blocked by apparmor
This works fine for SCSI devices, it fails only for DASD.
```
2025-04-15T15:02:26.048055+00:00 s5lp1-gen03 kernel: kauditd_printk_skb: 6 callbacks suppressed
2025-04-15T15:02:26.048075+00:00 s5lp1-gen03 kernel: audit: type=1400 audit(1744729346.034:270): apparmor="DENIED" operation="open" class="file" profile="lsblk" name="/sys/devices/css0/0.0.0000/0.0.0101/block/dasda/hidden" pid=2070 comm="lsblk" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
2025-04-15T15:02:26.048077+00:00 s5lp1-gen03 kernel: audit: type=1400 audit(1744729346.034:271): apparmor="DENIED" operation="open" class="file" profile="lsblk" name="/sys/devices/css0/0.0.0000/0.0.0101/block/dasda/dev" pid=2070 comm="lsblk" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
2025-04-15T15:02:26.048078+00:00 s5lp1-gen03 kernel: audit: type=1400 audit(1744729346.034:272): apparmor="DENIED" operation="open" class="file" profile="lsblk" name="/sys/devices/css0/0.0.0003/0.0.0104/block/dasdd/hidden" pid=2070 comm="lsblk" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
2025-04-15T15:02:26.048079+00:00 s5lp1-gen03 kernel: audit: type=1400 audit(1744729346.034:273): apparmor="DENIED" operation="open" class="file" profile="lsblk" name="/sys/devices/css0/0.0.0003/0.0.0104/block/dasdd/dev" pid=2070 comm="lsblk" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
2025-04-15T15:02:26.048080+00:00 s5lp1-gen03 kernel: audit: type=1400 audit(1744729346.034:274): apparmor="DENIED" operation="open" class="file" profile="lsblk" name="/sys/devices/css0/0.0.0001/0.0.0102/block/dasdb/hidden" pid=2070 comm="lsblk" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
2025-04-15T15:02:26.048080+00:00 s5lp1-gen03 kernel: audit: type=1400 audit(1744729346.034:275): apparmor="DENIED" operation="open" class="file" profile="lsblk" name="/sys/devices/css0/0.0.0001/0.0.0102/block/dasdb/dev" pid=2070 comm="lsblk" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
2025-04-15T15:02:26.048081+00:00 s5lp1-gen03 kernel: audit: type=1400 audit(1744729346.034:276): apparmor="DENIED" operation="open" class="file" profile="lsblk" name="/sys/devices/css0/0.0.0002/0.0.0103/block/dasdc/hidden" pid=2070 comm="lsblk" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
2025-04-15T15:02:26.048081+00:00 s5lp1-gen03 kernel: audit: type=1400 audit(1744729346.034:277): apparmor="DENIED" operation="open" class="file" profile="lsblk" name="/sys/devices/css0/0.0.0002/0.0.0103/block/dasdc/dev" pid=2070 comm="lsblk" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
```
Attaching also strace
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