Oracular ships systemd 256 and /tmp/ is now by default a tmpfs. [1]
On Oracular:
$ findmnt --target /tmp/
TARGET SOURCE FSTYPE OPTIONS
/tmp tmpfs tmpfs rw,nosuid,nodev,size=6123876k,nr_inodes=1048576,inode64
On Noble:
$ findmnt --target /tmp
TARGET
SOURCE FSTYPE OPTIONS
/ /dev/vda1 ext4 rw,relatime,discard,errors=remount-ro,commit=30
test_032_dev_kmem runs mknod(2) to create a character device file under /tmp.
Because of the difference, on Oracular, openat(2) (by errno-read.py) returns
earlier with errno 13 (Permission denied), while errno 6 (No such device) is
expected.
-> vfs_open()
[...]
-> may_open()
-> may_open_dev() returns 0 because of MNT_NODEV
return -EACCES
The whole point of test_032_dev_kmem is I think to test ubuntu policy
(CONFIG_DEVKMEM=n for many years):
-> vfs_open()
[...]
-> chrdev_open()
-> memory_open()
-> devlist[2 /*kmem*/] is empty so return -ENOXIO
I'll propose an update (fix) for test_032_dev_kmem to qa-regression-testing.
[1]
https://git.launchpad.net/ubuntu/+source/systemd/tree/debian/NEWS?h=ce0abd32d7d3a&id=ce0abd32d7d3a920a7728a21a1977749db2e3776
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https://bugs.launchpad.net/bugs/2083819
Title:
test_032_dev_kmem from ubuntu_qrt_kernel_security failed on Oracular
(Permission denied)
Status in ubuntu-kernel-tests:
New
Bug description:
Issue found on Openstack amd64/arm64/ppc64el with Oracular since
6.11.0-5.5 in d2024.08.12.
It's worthy to note that with 6.11.0-4.4, only ARM64 has failed with
this test, AMD64 and PPC64EL are good.
The test is expecting return code 6 (No such device), but we got 13
(Permission denied) here on Oracular.
Test log:
Running 'python3 ./test-kernel-security.py -v
KernelSecurityTest.test_032_dev_kmem'
Running test: './test-kernel-security.py' distro: 'Ubuntu 24.10' kernel:
'6.11.0-8.8 (Ubuntu 6.11.0-8.8-generic 6.11.0)' arch: 'amd64' init: 'systemd'
uid: 0/0 SUDO_USER: 'ubuntu')
test_032_dev_kmem (__main__.KernelSecurityTest.test_032_dev_kmem)
/dev/kmem not available ... FAIL
======================================================================
FAIL: test_032_dev_kmem (__main__.KernelSecurityTest.test_032_dev_kmem)
/dev/kmem not available
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/home/ubuntu/autotest/client/tmp/ubuntu_qrt_kernel_security/src/qa-regression-testing/scripts/./test-kernel-security.py",
line 375, in test_032_dev_kmem
self.assertShellExitEquals(expected, ["./errno-read.py", kmem, '4096'])
File
"/home/ubuntu/autotest/client/tmp/ubuntu_qrt_kernel_security/src/qa-regression-testing/scripts/testlib.py",
line 1332, in assertShellExitEquals
self.assertEqual(expected, rc, msg + result + report)
AssertionError: 6 != 13 : Got exit code 13, expected 6
Command: './errno-read.py', '/tmp/kmem-y9brst6e/kmem', '4096'
Output:
/tmp/kmem-y9brst6e/kmem: Permission denied
----------------------------------------------------------------------
Ran 1 test in 0.046s
FAILED (failures=1)
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