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oom: Add support for user unit ManagedOOM property updates

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Compared to PID1 where systemd-oomd has to be the client to PID1
because PID1 is a more privileged process than systemd-oomd, systemd-oomd
is the more privileged process compared to a user manager so we have
user managers be the client whereas systemd-oomd is now the server.

The same varlink protocol is used between user managers and systemd-oomd
to deliver ManagedOOM property updates. systemd-oomd now sets up a varlink
server that user managers connect to to send ManagedOOM property updates.

We also add extra validation to make sure that non-root senders don't
send updates for cgroups they don't own.

The integration test was extended to repeat the chill/bloat test using
a user manager instead of PID1.
This commit is contained in:
Daan De Meyer
2021-09-20 13:53:11 +01:00
parent f2ed82d510
commit 064a5c1438
13 changed files with 299 additions and 29 deletions
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src/basic/def.h
+4 -1
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@@ -64,4 +64,7 @@
.un.sun_path = "\0/org/freedesktop/plymouthd", \
}
#define VARLINK_ADDR_PATH_MANAGED_OOM "/run/systemd/io.system.ManagedOOM"
/* Path where PID1 listens for varlink subscriptions from systemd-oomd to notify of changes in ManagedOOM settings. */
#define VARLINK_ADDR_PATH_MANAGED_OOM_SYSTEM "/run/systemd/io.system.ManagedOOM"
/* Path where systemd-oomd listens for varlink connections from user managers to report changes in ManagedOOM settings. */
#define VARLINK_ADDR_PATH_MANAGED_OOM_USER "/run/systemd/oom/io.system.ManagedOOM"