Alan Jenkins 923f910115 man/systemd.exec: MountFlags=shared behaviour was changed (fixed?)
The behaviour described *was* observed on Fedora 28
(systemd-238-9.git0e0aa59), with and without SELinux.  I don't actually
know why though!  It contradicts my understanding of the code, including an
explicit comment in the code.

Testing in a VM upgraded to v239-792-g1327f272d, this behaviour goes away.


Test case:

# /etc/systemd/system/mount-test.service
[Service]
MountFlags=shared
Type=oneshot
ExecStart=/usr/bin/ls -l /proc/1/ns/mnt /proc/self/ns/mnt
ExecStart=/usr/bin/grep ext4 /proc/self/mountinfo


Weird old behaviour: new mount namespace but / is fully shared.

lrwxrwxrwx. 1 root root 0 Sep 14 11:18 /proc/1/ns/mnt -> mnt:[4026531840]
lrwxrwxrwx. 1 root root 0 Sep 14 11:48 /proc/self/ns/mnt ->
mnt:[4026532851]

968 967 253:0 / / rw,relatime shared:1 - ext4 /dev/mapper/alan_dell_2016...


Current behaviour: / is not fully shared

lrwxrwxrwx. 1 root root 0 Sep 14 11:39 /proc/1/ns/mnt -> mnt:[4026531840]
lrwxrwxrwx. 1 root root 0 Sep 14 11:41 /proc/self/ns/mnt ->
mnt:[4026532329]

591 558 8:3 / / rw,relatime shared:313 master:1 - ext4 /dev/sda3 rw,secl...
2018-10-05 17:38:38 +02:00
2018-09-19 09:44:21 +02:00
2018-06-14 13:03:20 +02:00
2018-10-01 19:47:45 +02:00
2018-06-14 13:03:20 +02:00
2018-08-27 14:13:25 +02:00
2018-01-12 18:02:57 +01:00
2018-06-20 13:32:57 +02:00
…
…
…
2018-10-02 18:00:10 +02:00

systemd - System and Service Manager

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Details

General information about systemd can be found in the systemd Wiki.

Information about build requirements are provided in the README file.

Consult our NEWS file for information about what's new in the most recent systemd versions.

Please see the HACKING file for information how to hack on systemd and test your modifications.

Please see our Contribution Guidelines for more information about filing GitHub Issues and posting GitHub Pull Requests.

When preparing patches for systemd, please follow our Coding Style Guidelines.

If you are looking for support, please contact our mailing list or join our IRC channel.

Stable branches with backported patches are available in the stable repo.

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