6592b9759c
This adds a new bus call to service and scope units called AttachProcesses() that moves arbitrary processes into the cgroup of the unit. The primary user for this new API is systemd itself: the systemd --user instance uses this call of the systemd --system instance to migrate processes if itself gets the request to migrate processes and the kernel refuses this due to access restrictions. The primary use-case of this is to make "systemd-run --scope --user …" invoked from user session scopes work correctly on pure cgroupsv2 environments. There, the kernel refuses to migrate processes between two unprivileged-owned cgroups unless the requestor as well as the ownership of the closest parent cgroup all match. This however is not the case between the session-XYZ.scope unit of a login session and the user@ABC.service of the systemd --user instance. The new logic always tries to move the processes on its own, but if that doesn't work when being the user manager, then the system manager is asked to do it instead. The new operation is relatively restrictive: it will only allow to move the processes like this if the caller is root, or the UID of the target unit, caller and process all match. Note that this means that unprivileged users cannot attach processes to scope units, as those do not have "owning" users (i.e. they have now User= field). Fixes: #3388
50 lines
2.2 KiB
C
50 lines
2.2 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "sd-bus.h"
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#include "unit.h"
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extern const sd_bus_vtable bus_unit_vtable[];
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extern const sd_bus_vtable bus_unit_cgroup_vtable[];
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void bus_unit_send_change_signal(Unit *u);
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void bus_unit_send_removed_signal(Unit *u);
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int bus_unit_method_start_generic(sd_bus_message *message, Unit *u, JobType job_type, bool reload_if_possible, sd_bus_error *error);
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int bus_unit_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error);
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int bus_unit_method_reset_failed(sd_bus_message *message, void *userdata, sd_bus_error *error);
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int bus_unit_set_properties(Unit *u, sd_bus_message *message, UnitWriteFlags flags, bool commit, sd_bus_error *error);
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int bus_unit_method_set_properties(sd_bus_message *message, void *userdata, sd_bus_error *error);
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int bus_unit_method_get_processes(sd_bus_message *message, void *userdata, sd_bus_error *error);
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int bus_unit_method_attach_processes(sd_bus_message *message, void *userdata, sd_bus_error *error);
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int bus_unit_method_ref(sd_bus_message *message, void *userdata, sd_bus_error *error);
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int bus_unit_method_unref(sd_bus_message *message, void *userdata, sd_bus_error *error);
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int bus_unit_queue_job(sd_bus_message *message, Unit *u, JobType type, JobMode mode, bool reload_if_possible, sd_bus_error *error);
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int bus_unit_check_load_state(Unit *u, sd_bus_error *error);
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int bus_unit_track_add_name(Unit *u, const char *name);
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int bus_unit_track_add_sender(Unit *u, sd_bus_message *m);
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int bus_unit_track_remove_sender(Unit *u, sd_bus_message *m);
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