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Merge pull request #8125 from poettering/cgroups-migrate

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Trivial merge conflict resolved locally.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2018-02-15 16:15:45 +01:00
commit 648461c07d
26 changed files with 888 additions and 299 deletions
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2
.mkosi/mkosi.fedora
View File

@ -22,7 +22,7 @@
[Distribution]
Distribution=fedora
Release=26
Release=27
[Output]
Format=raw_btrfs

11
TODO
View File

@ -24,8 +24,13 @@ Janitorial Clean-ups:
Features:
* check what setting the login shell to /bin/false vs. /sbin/nologin means and
do the right thing in get_user_creds_clean() with it.
* block setrlimit(RLIMIT_NOPROC) (and other per-user limits) in nspawn when userns is not on
* nss-systemd: implement enumeration, that shows all dynamic users plus the
synthesized ones if necessary, so that "getent passwd" shows useful data.
* teach tmpfiles.d q/Q logic something sensible in the context of XFS/ext4
project quota
* maybe rework get_user_creds() to query the user database if $SHELL is used
for root, but only then.
@ -378,8 +383,6 @@ Features:
* what to do about udev db binary stability for apps? (raw access is not an option)
* maybe provide an API to allow migration of foreign PIDs into existing scopes.
* man: maybe use the word "inspect" rather than "introspect"?
* systemctl: if some operation fails, show log output?

4
src/basic/missing.h
View File

@ -1368,4 +1368,8 @@ struct fib_rule_uid_range {
#define FALLOC_FL_PUNCH_HOLE 0x02
#endif
#ifndef PF_KTHREAD
#define PF_KTHREAD 0x00200000
#endif
#include "missing_syscall.h"

64
src/basic/process-util.c
View File

@ -398,37 +398,61 @@ use_saved_argv:
}
int is_kernel_thread(pid_t pid) {
_cleanup_free_ char *line = NULL;
unsigned long long flags;
size_t l, i;
const char *p;
size_t count;
char c;
bool eof;
FILE *f;
char *q;
int r;
if (IN_SET(pid, 0, 1) || pid == getpid_cached()) /* pid 1, and we ourselves certainly aren't a kernel thread */
return 0;
if (!pid_is_valid(pid))
return -EINVAL;
assert(pid > 1);
p = procfs_file_alloca(pid, "stat");
r = read_one_line_file(p, &line);
if (r == -ENOENT)
return -ESRCH;
if (r < 0)
return r;
p = procfs_file_alloca(pid, "cmdline");
f = fopen(p, "re");
if (!f) {
if (errno == ENOENT)
return -ESRCH;
return -errno;
/* Skip past the comm field */
q = strrchr(line, ')');
if (!q)
return -EINVAL;
q++;
/* Skip 6 fields to reach the flags field */
for (i = 0; i < 6; i++) {
l = strspn(q, WHITESPACE);
if (l < 1)
return -EINVAL;
q += l;
l = strcspn(q, WHITESPACE);
if (l < 1)
return -EINVAL;
q += l;
}
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
/* Skip preceeding whitespace */
l = strspn(q, WHITESPACE);
if (l < 1)
return -EINVAL;
q += l;
count = fread(&c, 1, 1, f);
eof = feof(f);
fclose(f);
/* Truncate the rest */
l = strcspn(q, WHITESPACE);
if (l < 1)
return -EINVAL;
q[l] = 0;
/* Kernel threads have an empty cmdline */
r = safe_atollu(q, &flags);
if (r < 0)
return r;
if (count <= 0)
return eof ? 1 : -errno;
return 0;
return !!(flags & PF_KTHREAD);
}
int get_process_capeff(pid_t pid, char **capeff) {

25
src/basic/user-util.c
View File

@ -197,6 +197,25 @@ int get_user_creds(
return 0;
}
static inline bool is_nologin_shell(const char *shell) {
return PATH_IN_SET(shell,
/* 'nologin' is the friendliest way to disable logins for a user account. It prints a nice
* message and exits. Different distributions place the binary at different places though,
* hence let's list them all. */
"/bin/nologin",
"/sbin/nologin",
"/usr/bin/nologin",
"/usr/sbin/nologin",
/* 'true' and 'false' work too for the same purpose, but are less friendly as they don't do
* any message printing. Different distributions place the binary at various places but at
* least not in the 'sbin' directory. */
"/bin/false",
"/usr/bin/false",
"/bin/true",
"/usr/bin/true");
}
int get_user_creds_clean(
const char **username,
uid_t *uid, gid_t *gid,
@ -212,11 +231,7 @@ int get_user_creds_clean(
return r;
if (shell &&
(isempty(*shell) || PATH_IN_SET(*shell,
"/bin/nologin",
"/sbin/nologin",
"/usr/bin/nologin",
"/usr/sbin/nologin")))
(isempty(*shell) || is_nologin_shell(*shell)))
*shell = NULL;
if (home &&

8
src/core/bpf-firewall.c
View File

@ -494,7 +494,7 @@ int bpf_firewall_compile(Unit *u) {
if (r < 0)
return r;
if (r == 0) {
log_debug("BPF firewalling not supported on this systemd, proceeding without.");
log_debug("BPF firewalling not supported on this manager, proceeding without.");
return -EOPNOTSUPP;
}
@ -556,7 +556,7 @@ int bpf_firewall_install(Unit *u) {
if (r < 0)
return r;
if (r == 0) {
log_debug("BPF firewalling not supported on this systemd, proceeding without.");
log_debug("BPF firewalling not supported on this manager, proceeding without.");
return -EOPNOTSUPP;
}
@ -569,7 +569,7 @@ int bpf_firewall_install(Unit *u) {
if (r < 0)
return log_error_errno(r, "Kernel upload of egress BPF program failed: %m");
r = bpf_program_cgroup_attach(u->ip_bpf_egress, BPF_CGROUP_INET_EGRESS, path, cc->delegate ? BPF_F_ALLOW_OVERRIDE : 0);
r = bpf_program_cgroup_attach(u->ip_bpf_egress, BPF_CGROUP_INET_EGRESS, path, unit_cgroup_delegate(u) ? BPF_F_ALLOW_OVERRIDE : 0);
if (r < 0)
return log_error_errno(r, "Attaching egress BPF program to cgroup %s failed: %m", path);
} else {
@ -584,7 +584,7 @@ int bpf_firewall_install(Unit *u) {
if (r < 0)
return log_error_errno(r, "Kernel upload of ingress BPF program failed: %m");
r = bpf_program_cgroup_attach(u->ip_bpf_ingress, BPF_CGROUP_INET_INGRESS, path, cc->delegate ? BPF_F_ALLOW_OVERRIDE : 0);
r = bpf_program_cgroup_attach(u->ip_bpf_ingress, BPF_CGROUP_INET_INGRESS, path, unit_cgroup_delegate(u) ? BPF_F_ALLOW_OVERRIDE : 0);
if (r < 0)
return log_error_errno(r, "Attaching ingress BPF program to cgroup %s failed: %m", path);
} else {

172
src/core/cgroup.c
View File

@ -24,6 +24,7 @@
#include "alloc-util.h"
#include "blockdev-util.h"
#include "bpf-firewall.h"
#include "bus-error.h"
#include "cgroup-util.h"
#include "cgroup.h"
#include "fd-util.h"
@ -1124,14 +1125,7 @@ CGroupMask unit_get_delegate_mask(Unit *u) {
*
* Note that on the unified hierarchy it is safe to delegate controllers to unprivileged services. */
if (u->type == UNIT_SLICE)
return 0;
c = unit_get_cgroup_context(u);
if (!c)
return 0;
if (!c->delegate)
if (!unit_cgroup_delegate(u))
return 0;
if (cg_all_unified() <= 0) {
@ -1142,6 +1136,7 @@ CGroupMask unit_get_delegate_mask(Unit *u) {
return 0;
}
assert_se(c = unit_get_cgroup_context(u));
return c->delegate_controllers;
}
@ -1309,13 +1304,12 @@ void unit_update_cgroup_members_masks(Unit *u) {
}
}
static const char *migrate_callback(CGroupMask mask, void *userdata) {
Unit *u = userdata;
const char *unit_get_realized_cgroup_path(Unit *u, CGroupMask mask) {
assert(mask != 0);
assert(u);
/* Returns the realized cgroup path of the specified unit where all specified controllers are available. */
while (u) {
if (u->cgroup_path &&
u->cgroup_realized &&
(u->cgroup_realized_mask & mask) == mask)
@ -1327,6 +1321,10 @@ static const char *migrate_callback(CGroupMask mask, void *userdata) {
return NULL;
}
static const char *migrate_callback(CGroupMask mask, void *userdata) {
return unit_get_realized_cgroup_path(userdata, mask);
}
char *unit_default_cgroup_path(Unit *u) {
_cleanup_free_ char *escaped = NULL, *slice = NULL;
int r;
@ -1496,7 +1494,7 @@ static int unit_create_cgroup(
u->cgroup_enabled_mask = enable_mask;
u->cgroup_bpf_state = needs_bpf ? UNIT_CGROUP_BPF_ON : UNIT_CGROUP_BPF_OFF;
if (u->type != UNIT_SLICE && !c->delegate) {
if (u->type != UNIT_SLICE && !unit_cgroup_delegate(u)) {
/* Then, possibly move things over, but not if
* subgroups may contain processes, which is the case
@ -1509,19 +1507,142 @@ static int unit_create_cgroup(
return 0;
}
int unit_attach_pids_to_cgroup(Unit *u) {
static int unit_attach_pid_to_cgroup_via_bus(Unit *u, pid_t pid, const char *suffix_path) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
char *pp;
int r;
assert(u);
if (MANAGER_IS_SYSTEM(u->manager))
return -EINVAL;
if (!u->manager->system_bus)
return -EIO;
if (!u->cgroup_path)
return -EINVAL;
/* Determine this unit's cgroup path relative to our cgroup root */
pp = path_startswith(u->cgroup_path, u->manager->cgroup_root);
if (!pp)
return -EINVAL;
pp = strjoina("/", pp, suffix_path);
path_kill_slashes(pp);
r = sd_bus_call_method(u->manager->system_bus,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"AttachProcessesToUnit",
&error, NULL,
"ssau",
NULL /* empty unit name means client's unit, i.e. us */, pp, 1, (uint32_t) pid);
if (r < 0)
return log_unit_debug_errno(u, r, "Failed to attach unit process " PID_FMT " via the bus: %s", pid, bus_error_message(&error, r));
return 0;
}
int unit_attach_pids_to_cgroup(Unit *u, Set *pids, const char *suffix_path) {
CGroupMask delegated_mask;
const char *p;
Iterator i;
void *pidp;
int r, q;
assert(u);
if (!UNIT_HAS_CGROUP_CONTEXT(u))
return -EINVAL;
if (set_isempty(pids))
return 0;
r = unit_realize_cgroup(u);
if (r < 0)
return r;
r = cg_attach_many_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->pids, migrate_callback, u);
if (r < 0)
return r;
if (isempty(suffix_path))
p = u->cgroup_path;
else
p = strjoina(u->cgroup_path, "/", suffix_path);
return 0;
delegated_mask = unit_get_delegate_mask(u);
r = 0;
SET_FOREACH(pidp, pids, i) {
pid_t pid = PTR_TO_PID(pidp);
CGroupController c;
/* First, attach the PID to the main cgroup hierarchy */
q = cg_attach(SYSTEMD_CGROUP_CONTROLLER, p, pid);
if (q < 0) {
log_unit_debug_errno(u, q, "Couldn't move process " PID_FMT " to requested cgroup '%s': %m", pid, p);
if (MANAGER_IS_USER(u->manager) && IN_SET(q, -EPERM, -EACCES)) {
int z;
/* If we are in a user instance, and we can't move the process ourselves due to
* permission problems, let's ask the system instance about it instead. Since it's more
* privileged it might be able to move the process across the leaves of a subtree who's
* top node is not owned by us. */
z = unit_attach_pid_to_cgroup_via_bus(u, pid, suffix_path);
if (z < 0)
log_unit_debug_errno(u, z, "Couldn't move process " PID_FMT " to requested cgroup '%s' via the system bus either: %m", pid, p);
else
continue; /* When the bus thing worked via the bus we are fully done for this PID. */
}
if (r >= 0)
r = q; /* Remember first error */
continue;
}
q = cg_all_unified();
if (q < 0)
return q;
if (q > 0)
continue;
/* In the legacy hierarchy, attach the process to the request cgroup if possible, and if not to the
* innermost realized one */
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
const char *realized;
if (!(u->manager->cgroup_supported & bit))
continue;
/* If this controller is delegated and realized, honour the caller's request for the cgroup suffix. */
if (delegated_mask & u->cgroup_realized_mask & bit) {
q = cg_attach(cgroup_controller_to_string(c), p, pid);
if (q >= 0)
continue; /* Success! */
log_unit_debug_errno(u, q, "Failed to attach PID " PID_FMT " to requested cgroup %s in controller %s, falling back to unit's cgroup: %m",
pid, p, cgroup_controller_to_string(c));
}
/* So this controller is either not delegate or realized, or something else weird happened. In
* that case let's attach the PID at least to the closest cgroup up the tree that is
* realized. */
realized = unit_get_realized_cgroup_path(u, bit);
if (!realized)
continue; /* Not even realized in the root slice? Then let's not bother */
q = cg_attach(cgroup_controller_to_string(c), realized, pid);
if (q < 0)
log_unit_debug_errno(u, q, "Failed to attach PID " PID_FMT " to realized cgroup %s in controller %s, ignoring: %m",
pid, realized, cgroup_controller_to_string(c));
}
}
return r;
}
static void cgroup_xattr_apply(Unit *u) {
@ -2563,6 +2684,21 @@ void unit_invalidate_cgroup_bpf(Unit *u) {
}
}
bool unit_cgroup_delegate(Unit *u) {
CGroupContext *c;
assert(u);
if (!UNIT_VTABLE(u)->can_delegate)
return false;
c = unit_get_cgroup_context(u);
if (!c)
return false;
return c->delegate;
}
void manager_invalidate_startup_units(Manager *m) {
Iterator i;
Unit *u;

5
src/core/cgroup.h
View File

@ -167,6 +167,7 @@ bool unit_get_needs_bpf(Unit *u);
void unit_update_cgroup_members_masks(Unit *u);
const char *unit_get_realized_cgroup_path(Unit *u, CGroupMask mask);
char *unit_default_cgroup_path(Unit *u);
int unit_set_cgroup_path(Unit *u, const char *path);
int unit_pick_cgroup_path(Unit *u);
@ -178,7 +179,7 @@ int unit_watch_cgroup(Unit *u);
void unit_add_to_cgroup_empty_queue(Unit *u);
int unit_attach_pids_to_cgroup(Unit *u);
int unit_attach_pids_to_cgroup(Unit *u, Set *pids, const char *suffix_path);
int manager_setup_cgroup(Manager *m);
void manager_shutdown_cgroup(Manager *m, bool delete);
@ -219,3 +220,5 @@ void manager_invalidate_startup_units(Manager *m);
const char* cgroup_device_policy_to_string(CGroupDevicePolicy i) _const_;
CGroupDevicePolicy cgroup_device_policy_from_string(const char *s) _pure_;
bool unit_cgroup_delegate(Unit *u);

6
src/core/dbus-cgroup.c
View File

@ -351,6 +351,9 @@ static int bus_cgroup_set_transient_property(
if (streq(name, "Delegate")) {
int b;
if (!UNIT_VTABLE(u)->can_delegate)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Delegation not available for unit type");
r = sd_bus_message_read(message, "b", &b);
if (r < 0)
return r;
@ -367,6 +370,9 @@ static int bus_cgroup_set_transient_property(
} else if (streq(name, "DelegateControllers")) {
CGroupMask mask = 0;
if (!UNIT_VTABLE(u)->can_delegate)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Delegation not available for unit type");
r = sd_bus_message_enter_container(message, 'a', "s");
if (r < 0)
return r;

128
src/core/dbus-manager.c
View File

@ -372,21 +372,16 @@ static int property_get_timer_slack_nsec(
return sd_bus_message_append(reply, "t", (uint64_t) prctl(PR_GET_TIMERSLACK));
}
static int method_get_unit(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_free_ char *path = NULL;
Manager *m = userdata;
const char *name;
static int bus_get_unit_by_name(Manager *m, sd_bus_message *message, const char *name, Unit **ret_unit, sd_bus_error *error) {
Unit *u;
int r;
assert(message);
assert(m);
assert(message);
assert(ret_unit);
/* Anyone can call this method */
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
/* More or less a wrapper around manager_get_unit() that generates nice errors and has one trick up its sleeve:
* if the name is specified empty we use the client's unit. */
if (isempty(name)) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
@ -409,6 +404,43 @@ static int method_get_unit(sd_bus_message *message, void *userdata, sd_bus_error
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", name);
}
*ret_unit = u;
return 0;
}
static int bus_load_unit_by_name(Manager *m, sd_bus_message *message, const char *name, Unit **ret_unit, sd_bus_error *error) {
assert(m);
assert(message);
assert(ret_unit);
/* Pretty much the same as bus_get_unit_by_name(), but we also load the unit if necessary. */
if (isempty(name))
return bus_get_unit_by_name(m, message, name, ret_unit, error);
return manager_load_unit(m, name, NULL, error, ret_unit);
}
static int method_get_unit(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_free_ char *path = NULL;
Manager *m = userdata;
const char *name;
Unit *u;
int r;
assert(message);
assert(m);
/* Anyone can call this method */
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
r = bus_get_unit_by_name(m, message, name, &u, error);
if (r < 0)
return r;
r = mac_selinux_unit_access_check(u, message, "status", error);
if (r < 0)
return r;
@ -541,26 +573,9 @@ static int method_load_unit(sd_bus_message *message, void *userdata, sd_bus_erro
if (r < 0)
return r;
if (isempty(name)) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
pid_t pid;
r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
if (r < 0)
return r;
r = sd_bus_creds_get_pid(creds, &pid);
if (r < 0)
return r;
u = manager_get_unit_by_pid(m, pid);
if (!u)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Client not member of any unit.");
} else {
r = manager_load_unit(m, name, NULL, error, &u);
if (r < 0)
return r;
}
r = bus_load_unit_by_name(m, message, name, &u, error);
if (r < 0)
return r;
r = mac_selinux_unit_access_check(u, message, "status", error);
if (r < 0)
@ -633,8 +648,10 @@ static int method_start_unit_replace(sd_bus_message *message, void *userdata, sd
if (r < 0)
return r;
u = manager_get_unit(m, old_name);
if (!u || !u->job || u->job->type != JOB_START)
r = bus_get_unit_by_name(m, message, old_name, &u, error);
if (r < 0)
return r;
if (!u->job || u->job->type != JOB_START)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_JOB, "No job queued for unit %s", old_name);
return method_start_unit_generic(message, m, JOB_START, false, error);
@ -653,9 +670,9 @@ static int method_kill_unit(sd_bus_message *message, void *userdata, sd_bus_erro
if (r < 0)
return r;
u = manager_get_unit(m, name);
if (!u)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s is not loaded.", name);
r = bus_get_unit_by_name(m, message, name, &u, error);
if (r < 0)
return r;
return bus_unit_method_kill(message, u, error);
}
@ -673,9 +690,9 @@ static int method_reset_failed_unit(sd_bus_message *message, void *userdata, sd_
if (r < 0)
return r;
u = manager_get_unit(m, name);
if (!u)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s is not loaded.", name);
r = bus_get_unit_by_name(m, message, name, &u, error);
if (r < 0)
return r;
return bus_unit_method_reset_failed(message, u, error);
}
@ -693,7 +710,7 @@ static int method_set_unit_properties(sd_bus_message *message, void *userdata, s
if (r < 0)
return r;
r = manager_load_unit(m, name, NULL, error, &u);
r = bus_load_unit_by_name(m, message, name, &u, error);
if (r < 0)
return r;
@ -717,7 +734,7 @@ static int method_ref_unit(sd_bus_message *message, void *userdata, sd_bus_error
if (r < 0)
return r;
r = manager_load_unit(m, name, NULL, error, &u);
r = bus_load_unit_by_name(m, message, name, &u, error);
if (r < 0)
return r;
@ -741,7 +758,7 @@ static int method_unref_unit(sd_bus_message *message, void *userdata, sd_bus_err
if (r < 0)
return r;
r = manager_load_unit(m, name, NULL, error, &u);
r = bus_load_unit_by_name(m, message, name, &u, error);
if (r < 0)
return r;
@ -810,7 +827,7 @@ static int method_list_units_by_names(sd_bus_message *message, void *userdata, s
if (!unit_name_is_valid(*unit, UNIT_NAME_ANY))
continue;
r = manager_load_unit(m, *unit, NULL, error, &u);
r = bus_load_unit_by_name(m, message, *unit, &u, error);
if (r < 0)
return r;
@ -839,13 +856,33 @@ static int method_get_unit_processes(sd_bus_message *message, void *userdata, sd
if (r < 0)
return r;
u = manager_get_unit(m, name);
if (!u)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", name);
r = bus_get_unit_by_name(m, message, name, &u, error);
if (r < 0)
return r;
return bus_unit_method_get_processes(message, u, error);
}
static int method_attach_processes_to_unit(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
const char *name;
Unit *u;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
r = bus_get_unit_by_name(m, message, name, &u, error);
if (r < 0)
return r;
return bus_unit_method_attach_processes(message, u, error);
}
static int transient_unit_from_message(
Manager *m,
sd_bus_message *message,
@ -2487,6 +2524,7 @@ const sd_bus_vtable bus_manager_vtable[] = {
SD_BUS_METHOD("UnrefUnit", "s", NULL, method_unref_unit, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("StartTransientUnit", "ssa(sv)a(sa(sv))", "o", method_start_transient_unit, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetUnitProcesses", "s", "a(sus)", method_get_unit_processes, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("AttachProcessesToUnit", "ssau", NULL, method_attach_processes_to_unit, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetJob", "u", "o", method_get_job, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetJobAfter", "u", "a(usssoo)", method_get_job_waiting, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetJobBefore", "u", "a(usssoo)", method_get_job_waiting, SD_BUS_VTABLE_UNPRIVILEGED),

32
src/core/dbus-scope.c
View File

@ -89,17 +89,39 @@ static int bus_scope_set_transient_property(
return bus_set_transient_usec(UNIT(s), name, &s->timeout_stop_usec, message, flags, error);
if (streq(name, "PIDs")) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
unsigned n = 0;
uint32_t pid;
r = sd_bus_message_enter_container(message, 'a', "u");
if (r < 0)
return r;
while ((r = sd_bus_message_read(message, "u", &pid)) > 0) {
for (;;) {
uint32_t upid;
pid_t pid;
if (pid <= 1)
return -EINVAL;
r = sd_bus_message_read(message, "u", &upid);
if (r < 0)
return r;
if (r == 0)
break;
if (upid == 0) {
if (!creds) {
r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
if (r < 0)
return r;
}
r = sd_bus_creds_get_pid(creds, &pid);
if (r < 0)
return r;
} else
pid = (uid_t) upid;
r = unit_pid_attachable(UNIT(s), pid, error);
if (r < 0)
return r;
if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
r = unit_watch_pid(UNIT(s), pid);
@ -109,8 +131,6 @@ static int bus_scope_set_transient_property(
n++;
}
if (r < 0)
return r;
r = sd_bus_message_exit_container(message);
if (r < 0)

113
src/core/dbus-unit.c
View File

@ -1127,6 +1127,118 @@ static int property_get_ip_counter(
return sd_bus_message_append(reply, "t", value);
}
int bus_unit_method_attach_processes(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
_cleanup_(set_freep) Set *pids = NULL;
Unit *u = userdata;
const char *path;
int r;
assert(message);
/* This migrates the processes with the specified PIDs into the cgroup of this unit, optionally below a
* specified cgroup path. Obviously this only works for units that actually maintain a cgroup
* representation. If a process is already in the cgroup no operation is executed – in this case the specified
* subcgroup path has no effect! */
r = mac_selinux_unit_access_check(u, message, "start", error);
if (r < 0)
return r;
r = sd_bus_message_read(message, "s", &path);
if (r < 0)
return r;
path = empty_to_null(path);
if (path) {
if (!path_is_absolute(path))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Control group path is not absolute: %s", path);
if (!path_is_normalized(path))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Control group path is not normalized: %s", path);
}
if (!unit_cgroup_delegate(u))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Process migration not available on non-delegated units.");
if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit is not active, refusing.");
r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID|SD_BUS_CREDS_PID, &creds);
if (r < 0)
return r;
r = sd_bus_message_enter_container(message, 'a', "u");
if (r < 0)
return r;
for (;;) {
uid_t process_uid, sender_uid;
uint32_t upid;
pid_t pid;
r = sd_bus_message_read(message, "u", &upid);
if (r < 0)
return r;
if (r == 0)
break;
if (upid == 0) {
r = sd_bus_creds_get_pid(creds, &pid);
if (r < 0)
return r;
} else
pid = (uid_t) upid;
/* Filter out duplicates */
if (set_contains(pids, PID_TO_PTR(pid)))
continue;
/* Check if this process is suitable for attaching to this unit */
r = unit_pid_attachable(u, pid, error);
if (r < 0)
return r;
/* Let's query the sender's UID, so that we can make our security decisions */
r = sd_bus_creds_get_euid(creds, &sender_uid);
if (r < 0)
return r;
/* Let's validate security: if the sender is root, then all is OK. If the sender is is any other unit,
* then the process' UID and the target unit's UID have to match the sender's UID */
if (sender_uid != 0 && sender_uid != getuid()) {
r = get_process_uid(pid, &process_uid);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to retrieve process UID: %m");
if (process_uid != sender_uid)
return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Process " PID_FMT " not owned by client's UID. Refusing.", pid);
if (process_uid != u->ref_uid)
return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Process " PID_FMT " not owned by target unit's UID. Refusing.", pid);
}
if (!pids) {
pids = set_new(NULL);
if (!pids)
return -ENOMEM;
}
r = set_put(pids, PID_TO_PTR(pid));
if (r < 0)
return r;
}
r = sd_bus_message_exit_container(message);
if (r < 0)
return r;
r = unit_attach_pids_to_cgroup(u, pids, path);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to attach processes to control group: %m");
return sd_bus_reply_method_return(message, NULL);
}
const sd_bus_vtable bus_unit_cgroup_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_PROPERTY("Slice", "s", property_get_slice, 0, 0),
@ -1139,6 +1251,7 @@ const sd_bus_vtable bus_unit_cgroup_vtable[] = {
SD_BUS_PROPERTY("IPEgressBytes", "t", property_get_ip_counter, 0, 0),
SD_BUS_PROPERTY("IPEgressPackets", "t", property_get_ip_counter, 0, 0),
SD_BUS_METHOD("GetProcesses", NULL, "a(sus)", bus_unit_method_get_processes, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("AttachProcesses", "sau", NULL, bus_unit_method_attach_processes, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_VTABLE_END
};

1
src/core/dbus-unit.h
View File

@ -37,6 +37,7 @@ int bus_unit_method_reset_failed(sd_bus_message *message, void *userdata, sd_bus
int bus_unit_set_properties(Unit *u, sd_bus_message *message, UnitWriteFlags flags, bool commit, sd_bus_error *error);
int bus_unit_method_set_properties(sd_bus_message *message, void *userdata, sd_bus_error *error);
int bus_unit_method_get_processes(sd_bus_message *message, void *userdata, sd_bus_error *error);
int bus_unit_method_attach_processes(sd_bus_message *message, void *userdata, sd_bus_error *error);
int bus_unit_method_ref(sd_bus_message *message, void *userdata, sd_bus_error *error);
int bus_unit_method_unref(sd_bus_message *message, void *userdata, sd_bus_error *error);

162
src/core/dbus.c
View File

@ -139,9 +139,10 @@ static int signal_disconnected(sd_bus_message *message, void *userdata, sd_bus_e
assert_se(bus = sd_bus_message_get_bus(message));
if (bus == m->api_bus)
destroy_bus(m, &m->api_bus);
bus_done_api(m);
if (bus == m->system_bus)
destroy_bus(m, &m->system_bus);
bus_done_system(m);
if (set_remove(m->private_buses, bus)) {
log_debug("Got disconnect on private connection.");
destroy_bus(m, &bus);
@ -652,6 +653,8 @@ static int bus_on_connection(sd_event_source *s, int fd, uint32_t revents, void
return 0;
}
(void) sd_bus_set_description(bus, "private-bus-connection");
r = sd_bus_set_fd(bus, nfd, nfd);
if (r < 0) {
log_warning_errno(r, "Failed to set fd on new connection bus: %m");
@ -724,17 +727,29 @@ static int bus_on_connection(sd_event_source *s, int fd, uint32_t revents, void
return 0;
}
int manager_sync_bus_names(Manager *m, sd_bus *bus) {
static int manager_dispatch_sync_bus_names(sd_event_source *es, void *userdata) {
_cleanup_strv_free_ char **names = NULL;
Manager *m = userdata;
const char *name;
Iterator i;
Unit *u;
int r;
assert(es);
assert(m);
assert(bus);
assert(m->sync_bus_names_event_source == es);
r = sd_bus_list_names(bus, &names, NULL);
/* First things first, destroy the defer event so that we aren't triggered again */
m->sync_bus_names_event_source = sd_event_source_unref(m->sync_bus_names_event_source);
/* Let's see if there's anything to do still? */
if (!m->api_bus)
return 0;
if (hashmap_isempty(m->watch_bus))
return 0;
/* OK, let's sync up the names. Let's see which names are currently on the bus. */
r = sd_bus_list_names(m->api_bus, &names, NULL);
if (r < 0)
return log_error_errno(r, "Failed to get initial list of names: %m");
@ -758,7 +773,7 @@ int manager_sync_bus_names(Manager *m, sd_bus *bus) {
const char *unique;
/* If it is, determine its current owner */
r = sd_bus_get_name_creds(bus, name, SD_BUS_CREDS_UNIQUE_NAME, &creds);
r = sd_bus_get_name_creds(m->api_bus, name, SD_BUS_CREDS_UNIQUE_NAME, &creds);
if (r < 0) {
log_full_errno(r == -ENXIO ? LOG_DEBUG : LOG_ERR, r, "Failed to get bus name owner %s: %m", name);
continue;
@ -792,6 +807,34 @@ int manager_sync_bus_names(Manager *m, sd_bus *bus) {
return 0;
}
int manager_enqueue_sync_bus_names(Manager *m) {
int r;
assert(m);
/* Enqueues a request to synchronize the bus names in a later event loop iteration. The callers generally don't
* want us to invoke ->bus_name_owner_change() unit calls from their stack frames as this might result in event
* dispatching on its own creating loops, hence we simply create a defer event for the event loop and exit. */
if (m->sync_bus_names_event_source)
return 0;
r = sd_event_add_defer(m->event, &m->sync_bus_names_event_source, manager_dispatch_sync_bus_names, m);
if (r < 0)
return log_error_errno(r, "Failed to create bus name synchronization event: %m");
r = sd_event_source_set_priority(m->sync_bus_names_event_source, SD_EVENT_PRIORITY_IDLE);
if (r < 0)
return log_error_errno(r, "Failed to set event priority: %m");
r = sd_event_source_set_enabled(m->sync_bus_names_event_source, SD_EVENT_ONESHOT);
if (r < 0)
return log_error_errno(r, "Failed to set even to oneshot: %m");
(void) sd_event_source_set_description(m->sync_bus_names_event_source, "manager-sync-bus-names");
return 0;
}
static int bus_setup_api(Manager *m, sd_bus *bus) {
Iterator i;
char *name;
@ -837,15 +880,12 @@ static int bus_setup_api(Manager *m, sd_bus *bus) {
if (r < 0)
return log_error_errno(r, "Failed to request name: %m");
r = manager_sync_bus_names(m, bus);
if (r < 0)
return r;
log_debug("Successfully connected to API bus.");
return 0;
}
static int bus_init_api(Manager *m) {
int bus_init_api(Manager *m) {
_cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
int r;
@ -879,6 +919,10 @@ static int bus_init_api(Manager *m) {
m->api_bus = bus;
bus = NULL;
r = manager_enqueue_sync_bus_names(m);
if (r < 0)
return r;
return 0;
}
@ -906,7 +950,7 @@ static int bus_setup_system(Manager *m, sd_bus *bus) {
return 0;
}
static int bus_init_system(Manager *m) {
int bus_init_system(Manager *m) {
_cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
int r;
@ -914,23 +958,22 @@ static int bus_init_system(Manager *m) {
return 0;
/* The API and system bus is the same if we are running in system mode */
if (MANAGER_IS_SYSTEM(m) && m->api_bus) {
m->system_bus = sd_bus_ref(m->api_bus);
return 0;
if (MANAGER_IS_SYSTEM(m) && m->api_bus)
bus = sd_bus_ref(m->api_bus);
else {
r = sd_bus_open_system(&bus);
if (r < 0)
return log_error_errno(r, "Failed to connect to system bus: %m");
r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
if (r < 0)
return log_error_errno(r, "Failed to attach system bus to event loop: %m");
r = bus_setup_disconnected_match(m, bus);
if (r < 0)
return r;
}
r = sd_bus_open_system(&bus);
if (r < 0)
return log_error_errno(r, "Failed to connect to system bus: %m");
r = bus_setup_disconnected_match(m, bus);
if (r < 0)
return r;
r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
if (r < 0)
return log_error_errno(r, "Failed to attach system bus to event loop: %m");
r = bus_setup_system(m, bus);
if (r < 0)
return log_error_errno(r, "Failed to set up system bus: %m");
@ -941,7 +984,7 @@ static int bus_init_system(Manager *m) {
return 0;
}
static int bus_init_private(Manager *m) {
int bus_init_private(Manager *m) {
_cleanup_close_ int fd = -1;
union sockaddr_union sa = {
.un.sun_family = AF_UNIX
@ -1013,26 +1056,6 @@ static int bus_init_private(Manager *m) {
return 0;
}
int bus_init(Manager *m, bool try_bus_connect) {
int r;
if (try_bus_connect) {
r = bus_init_system(m);
if (r < 0)
return log_error_errno(r, "Failed to initialize D-Bus connection: %m");
r = bus_init_api(m);
if (r < 0)
return log_error_errno(r, "Error occured during D-Bus APIs initialization: %m");
}
r = bus_init_private(m);
if (r < 0)
return log_error_errno(r, "Failed to create private D-Bus server: %m");
return 0;
}
static void destroy_bus(Manager *m, sd_bus **bus) {
Iterator i;
Unit *u;
@ -1063,6 +1086,10 @@ static void destroy_bus(Manager *m, sd_bus **bus) {
if (j->bus_track && sd_bus_track_get_bus(j->bus_track) == *bus)
j->bus_track = sd_bus_track_unref(j->bus_track);
HASHMAP_FOREACH(u, m->units, i)
if (u->bus_track && sd_bus_track_get_bus(u->bus_track) == *bus)
u->bus_track = sd_bus_track_unref(u->bus_track);
/* Get rid of queued message on this bus */
if (m->queued_message && sd_bus_message_get_bus(m->queued_message) == *bus)
m->queued_message = sd_bus_message_unref(m->queued_message);
@ -1077,28 +1104,44 @@ static void destroy_bus(Manager *m, sd_bus **bus) {
*bus = sd_bus_unref(*bus);
}
void bus_done(Manager *m) {
sd_bus *b;
void bus_done_api(Manager *m) {
assert(m);
if (m->api_bus)
destroy_bus(m, &m->api_bus);
}
void bus_done_system(Manager *m) {
assert(m);
if (m->system_bus)
destroy_bus(m, &m->system_bus);
}
void bus_done_private(Manager *m) {
sd_bus *b;
assert(m);
while ((b = set_steal_first(m->private_buses)))
destroy_bus(m, &b);
m->private_buses = set_free(m->private_buses);
m->subscribed = sd_bus_track_unref(m->subscribed);
m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
if (m->private_listen_event_source)
m->private_listen_event_source = sd_event_source_unref(m->private_listen_event_source);
m->private_listen_event_source = sd_event_source_unref(m->private_listen_event_source);
m->private_listen_fd = safe_close(m->private_listen_fd);
}
void bus_done(Manager *m) {
assert(m);
bus_done_api(m);
bus_done_system(m);
bus_done_private(m);
assert(!m->subscribed);
m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
bus_verify_polkit_async_registry_free(m->polkit_registry);
}
@ -1160,8 +1203,9 @@ int bus_foreach_bus(
}
/* Send to API bus, but only if somebody is subscribed */
if (sd_bus_track_count(m->subscribed) > 0 ||
sd_bus_track_count(subscribed2) > 0) {
if (m->api_bus &&
(sd_bus_track_count(m->subscribed) > 0 ||
sd_bus_track_count(subscribed2) > 0)) {
r = send_message(m->api_bus, userdata);
if (r < 0)
ret = r;

10
src/core/dbus.h
View File

@ -24,7 +24,13 @@
int bus_send_queued_message(Manager *m);
int bus_init(Manager *m, bool try_bus_connect);
int bus_init_private(Manager *m);
int bus_init_api(Manager *m);
int bus_init_system(Manager *m);
void bus_done_private(Manager *m);
void bus_done_api(Manager *m);
void bus_done_system(Manager *m);
void bus_done(Manager *m);
int bus_fdset_add_all(Manager *m, FDSet *fds);
@ -32,7 +38,7 @@ int bus_fdset_add_all(Manager *m, FDSet *fds);
void bus_track_serialize(sd_bus_track *t, FILE *f, const char *prefix);
int bus_track_coldplug(Manager *m, sd_bus_track **t, bool recursive, char **l);
int manager_sync_bus_names(Manager *m, sd_bus *bus);
int manager_enqueue_sync_bus_names(Manager *m);
int bus_foreach_bus(Manager *m, sd_bus_track *subscribed2, int (*send_message)(sd_bus *bus, void *userdata), void *userdata);

148
src/core/manager.c
View File

@ -985,26 +985,6 @@ static int manager_setup_user_lookup_fd(Manager *m) {
return 0;
}
static int manager_connect_bus(Manager *m, bool reexecuting) {
bool try_bus_connect;
Unit *u = NULL;
assert(m);
if (m->test_run_flags)
return 0;
u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
try_bus_connect =
(u && SERVICE(u)->deserialized_state == SERVICE_RUNNING) &&
(reexecuting ||
(MANAGER_IS_USER(m) && getenv("DBUS_SESSION_BUS_ADDRESS")));
/* Try to connect to the buses, if possible. */
return bus_init(m, try_bus_connect);
}
static unsigned manager_dispatch_cleanup_queue(Manager *m) {
Unit *u;
unsigned n = 0;
@ -1223,6 +1203,7 @@ Manager* manager_free(Manager *m) {
sd_event_source_unref(m->jobs_in_progress_event_source);
sd_event_source_unref(m->run_queue_event_source);
sd_event_source_unref(m->user_lookup_event_source);
sd_event_source_unref(m->sync_bus_names_event_source);
safe_close(m->signal_fd);
safe_close(m->notify_fd);
@ -1374,6 +1355,38 @@ static void manager_distribute_fds(Manager *m, FDSet *fds) {
}
}
static bool manager_dbus_is_running(Manager *m, bool deserialized) {
Unit *u;
assert(m);
/* This checks whether the dbus instance we are supposed to expose our APIs on is up. We check both the socket
* and the service unit. If the 'deserialized' parameter is true we'll check the deserialized state of the unit
* rather than the current one. */
if (m->test_run_flags != 0)
return false;
/* If we are in the user instance, and the env var is already set for us, then this means D-Bus is ran
* somewhere outside of our own logic. Let's use it */
if (MANAGER_IS_USER(m) && getenv("DBUS_SESSION_BUS_ADDRESS"))
return true;
u = manager_get_unit(m, SPECIAL_DBUS_SOCKET);
if (!u)
return false;
if ((deserialized ? SOCKET(u)->deserialized_state : SOCKET(u)->state) != SOCKET_RUNNING)
return false;
u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
if (!u)
return false;
if (!IN_SET((deserialized ? SERVICE(u)->deserialized_state : SERVICE(u)->state), SERVICE_RUNNING, SERVICE_RELOAD))
return false;
return true;
}
int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
int r;
@ -1454,9 +1467,22 @@ int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
/* This shouldn't fail, except if things are really broken. */
return r;
/* Let's connect to the bus now. */
(void) manager_connect_bus(m, !!serialization);
/* Let's set up our private bus connection now, unconditionally */
(void) bus_init_private(m);
/* If we are in --user mode also connect to the system bus now */
if (MANAGER_IS_USER(m))
(void) bus_init_system(m);
/* Let's connect to the bus now, but only if the unit is supposed to be up */
if (manager_dbus_is_running(m, !!serialization)) {
(void) bus_init_api(m);
if (MANAGER_IS_SYSTEM(m))
(void) bus_init_system(m);
}
/* Now that we are connected to all possible busses, let's deserialize who is tracking us. */
(void) bus_track_coldplug(m, &m->subscribed, false, m->deserialized_subscribed);
m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
@ -2294,23 +2320,21 @@ static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t
/* This is a nop on non-init */
break;
case SIGUSR1: {
Unit *u;
case SIGUSR1:
u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
if (manager_dbus_is_running(m, false)) {
log_info("Trying to reconnect to bus...");
bus_init(m, true);
}
if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
log_info("Loading D-Bus service...");
(void) bus_init_api(m);
if (MANAGER_IS_SYSTEM(m))
(void) bus_init_system(m);
} else {
log_info("Starting D-Bus service...");
manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
}
break;
}
case SIGUSR2: {
_cleanup_free_ char *dump = NULL;
@ -3153,12 +3177,14 @@ int manager_reload(Manager *m) {
exec_runtime_vacuum(m);
/* It might be safe to log to the journal now. */
/* It might be safe to log to the journal now and connect to dbus */
manager_recheck_journal(m);
manager_recheck_dbus(m);
/* Sync current state of bus names with our set of listening units */
if (m->api_bus)
manager_sync_bus_names(m, m->api_bus);
q = manager_enqueue_sync_bus_names(m);
if (q < 0 && r >= 0)
r = q;
assert(m->n_reloading > 0);
m->n_reloading--;
@ -3518,11 +3544,35 @@ int manager_set_default_rlimits(Manager *m, struct rlimit **default_rlimit) {
return 0;
}
void manager_recheck_dbus(Manager *m) {
assert(m);
/* Connects to the bus if the dbus service and socket are running. If we are running in user mode this is all
* it does. In system mode we'll also connect to the system bus (which will most likely just reuse the
* connection of the API bus). That's because the system bus after all runs as service of the system instance,
* while in the user instance we can assume it's already there. */
if (manager_dbus_is_running(m, false)) {
(void) bus_init_api(m);
if (MANAGER_IS_SYSTEM(m))
(void) bus_init_system(m);
} else {
(void) bus_done_api(m);
if (MANAGER_IS_SYSTEM(m))
(void) bus_done_system(m);
}
}
static bool manager_journal_is_running(Manager *m) {
Unit *u;
assert(m);
if (m->test_run_flags != 0)
return false;
/* If we are the user manager we can safely assume that the journal is up */
if (!MANAGER_IS_SYSTEM(m))
return true;
@ -3538,7 +3588,7 @@ static bool manager_journal_is_running(Manager *m) {
u = manager_get_unit(m, SPECIAL_JOURNALD_SERVICE);
if (!u)
return false;
if (SERVICE(u)->state != SERVICE_RUNNING)
if (!IN_SET(SERVICE(u)->state, SERVICE_RELOAD, SERVICE_RUNNING))
return false;
return true;
@ -3552,16 +3602,10 @@ void manager_recheck_journal(Manager *m) {
if (getpid_cached() != 1)
return;
if (manager_journal_is_running(m)) {
/* The journal is fully and entirely up? If so, let's permit logging to it, if that's configured. */
log_set_prohibit_ipc(false);
} else {
/* If the journal is down, don't ever log to it, otherwise we might end up deadlocking ourselves as we
* might trigger an activation ourselves we can't fulfill */
log_set_prohibit_ipc(true);
}
/* The journal is fully and entirely up? If so, let's permit logging to it, if that's configured. If the
* journal is down, don't ever log to it, otherwise we might end up deadlocking ourselves as we might trigger
* an activation ourselves we can't fulfill. */
log_set_prohibit_ipc(!manager_journal_is_running(m));
log_open();
}
@ -3702,18 +3746,6 @@ Set *manager_get_units_requiring_mounts_for(Manager *m, const char *path) {
return hashmap_get(m->units_requiring_mounts_for, streq(p, "/") ? "" : p);
}
void manager_set_exec_params(Manager *m, ExecParameters *p) {
assert(m);
assert(p);
p->environment = m->environment;
p->confirm_spawn = manager_get_confirm_spawn(m);
p->cgroup_supported = m->cgroup_supported;
p->prefix = m->prefix;
SET_FLAG(p->flags, EXEC_PASS_LOG_UNIT|EXEC_CHOWN_DIRECTORIES, MANAGER_IS_SYSTEM(m));
}
int manager_update_failed_units(Manager *m, Unit *u, bool failed) {
unsigned size;
int r;

5
src/core/manager.h
View File

@ -182,6 +182,8 @@ struct Manager {
int user_lookup_fds[2];
sd_event_source *user_lookup_event_source;
sd_event_source *sync_bus_names_event_source;
UnitFileScope unit_file_scope;
LookupPaths lookup_paths;
Set *unit_path_cache;
@ -425,6 +427,7 @@ bool manager_unit_inactive_or_pending(Manager *m, const char *name);
void manager_check_finished(Manager *m);
void manager_recheck_dbus(Manager *m);
void manager_recheck_journal(Manager *m);
void manager_set_show_status(Manager *m, ShowStatus mode);
@ -435,8 +438,6 @@ void manager_flip_auto_status(Manager *m, bool enable);
Set *manager_get_units_requiring_mounts_for(Manager *m, const char *path);
void manager_set_exec_params(Manager *m, ExecParameters *p);
ManagerState manager_state(Manager *m);
int manager_update_failed_units(Manager *m, Unit *u, bool failed);

1
src/core/mount.c
View File

@ -781,7 +781,6 @@ static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
if (r < 0)
return r;
manager_set_exec_params(UNIT(m)->manager, &exec_params);
unit_set_exec_params(UNIT(m), &exec_params);
r = exec_spawn(UNIT(m),

178
src/core/org.freedesktop.systemd1.conf
View File

@ -30,7 +30,7 @@
<policy context="default">
<deny send_destination="org.freedesktop.systemd1"/>
<!-- Completely open to anyone -->
<!-- Completely open to anyone: org.freedesktop.DBus.* interfaces -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.DBus.Introspectable"/>
@ -46,6 +46,8 @@
send_interface="org.freedesktop.DBus.Properties"
send_member="GetAll"/>
<!-- Completely open to anyone: org.freedesktop.systemd1.Manager interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnit"/>
@ -62,6 +64,10 @@
send_interface="org.freedesktop.systemd1.Manager"
send_member="LoadUnit"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitProcesses"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetJob"/>
@ -88,23 +94,7 @@
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="ListUnitFiles"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="ListUnitFilesByPatterns"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitFileState"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitProcesses"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitFileLinks"/>
send_member="ListUnitsByNames"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
@ -122,10 +112,26 @@
send_interface="org.freedesktop.systemd1.Manager"
send_member="Dump"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="ListUnitFiles"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="ListUnitFilesByPatterns"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitFileState"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetDefaultTarget"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitFileLinks"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="LookupDynamicUserByName"/>
@ -134,7 +140,43 @@
send_interface="org.freedesktop.systemd1.Manager"
send_member="LookupDynamicUserByUID"/>
<!-- Managed via polkit or other criteria -->
<!-- Completely open to anyone: org.freedesktop.systemd1.Unit interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Service"
send_member="GetProcesses"/>
<!-- Completely open to anyone: org.freedesktop.systemd1.Slice interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Slice"
send_member="GetProcesses"/>
<!-- Completely open to anyone: org.freedesktop.systemd1.Scope interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Scope"
send_member="GetProcesses"/>
<!-- Completely open to anyone: org.freedesktop.systemd1.Socket interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Socket"
send_member="GetProcesses"/>
<!-- Completely open to anyone: org.freedesktop.systemd1.Mount interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Mount"
send_member="GetProcesses"/>
<!-- Completely open to anyone: org.freedesktop.systemd1.Swap interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Swap"
send_member="GetProcesses"/>
<!-- Managed via polkit or other criteria: org.freedesktop.systemd1.Manager interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
@ -182,16 +224,32 @@
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="ListUnitsByNames"/>
send_member="RefUnit"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="UnrefUnit"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="StartTransientUnit"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="AttachProcessesToUnit"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="CancelJob"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="ClearJobs"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="ResetFailed"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="Reload"/>
@ -200,14 +258,6 @@
send_interface="org.freedesktop.systemd1.Manager"
send_member="Reexecute"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="RefUnit"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="UnrefUnit"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="EnableUnitFiles"/>
@ -224,10 +274,6 @@
send_interface="org.freedesktop.systemd1.Manager"
send_member="LinkUnitFiles"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="RevertUnitFiles"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="PresetUnitFiles"/>
@ -244,6 +290,10 @@
send_interface="org.freedesktop.systemd1.Manager"
send_member="UnmaskUnitFiles"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="RevertUnitFiles"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="SetDefaultTarget"/>
@ -256,6 +306,8 @@
send_interface="org.freedesktop.systemd1.Manager"
send_member="AddDependencyUnitFiles"/>
<!-- Managed via polkit or other criteria: org.freedesktop.systemd1.Job interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Job"
send_member="Cancel"/>
@ -268,6 +320,68 @@
send_interface="org.freedesktop.systemd1.Job"
send_member="GetBefore"/>
<!-- Managed via polkit or other criteria: org.freedesktop.systemd1.Unit interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="Start"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="Stop"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="Reload"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="Restart"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="TryRestart"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="ReloadOrRestart"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="ReloadOrTryRestart"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="Kill"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="ResetFailed"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="SetProperties"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="Ref"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Unit"
send_member="Unref"/>
<!-- Managed via polkit or other criteria: org.freedesktop.systemd1.Service interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Service"
send_member="AttachProcesses"/>
<!-- Managed via polkit or other criteria: org.freedesktop.systemd1.Scope interface -->
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Scope"
send_member="AttachProcesses"/>
<allow receive_sender="org.freedesktop.systemd1"/>
</policy>

3
src/core/scope.c
View File

@ -343,7 +343,7 @@ static int scope_start(Unit *u) {
unit_export_state_files(UNIT(s));
r = unit_attach_pids_to_cgroup(u);
r = unit_attach_pids_to_cgroup(u, UNIT(s)->pids, NULL);
if (r < 0) {
log_unit_warning_errno(UNIT(s), r, "Failed to add PIDs to scope's control group: %m");
scope_enter_dead(s, SCOPE_FAILURE_RESOURCES);
@ -599,6 +599,7 @@ const UnitVTable scope_vtable = {
.private_section = "Scope",
.can_transient = true,
.can_delegate = true,
.init = scope_init,
.load = scope_load,

5
src/core/service.c
View File

@ -1449,7 +1449,6 @@ static int service_spawn(
}
}
manager_set_exec_params(UNIT(s)->manager, &exec_params);
unit_set_exec_params(UNIT(s), &exec_params);
final_env = strv_env_merge(2, exec_params.environment, our_env, NULL);
@ -3909,6 +3908,9 @@ const UnitVTable service_vtable = {
"Install\0",
.private_section = "Service",
.can_transient = true,
.can_delegate = true,
.init = service_init,
.done = service_done,
.load = service_load,
@ -3954,7 +3956,6 @@ const UnitVTable service_vtable = {
.get_timeout = service_get_timeout,
.needs_console = service_needs_console,
.can_transient = true,
.status_message_formats = {
.starting_stopping = {

1
src/core/socket.c
View File

@ -1910,7 +1910,6 @@ static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
if (r < 0)
return r;
manager_set_exec_params(UNIT(s)->manager, &exec_params);
unit_set_exec_params(UNIT(s), &exec_params);
exec_params.argv = c->argv;

1
src/core/swap.c
View File

@ -632,7 +632,6 @@ static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
if (r < 0)
goto fail;
manager_set_exec_params(UNIT(s)->manager, &exec_params);
unit_set_exec_params(UNIT(s), &exec_params);
r = exec_spawn(UNIT(s),

87
src/core/unit.c
View File

@ -2326,18 +2326,16 @@ static void unit_update_on_console(Unit *u) {
}
void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
Manager *m;
bool unexpected;
Manager *m;
assert(u);
assert(os < _UNIT_ACTIVE_STATE_MAX);
assert(ns < _UNIT_ACTIVE_STATE_MAX);
/* Note that this is called for all low-level state changes,
* even if they might map to the same high-level
* UnitActiveState! That means that ns == os is an expected
* behavior here. For example: if a mount point is remounted
* this function will be called too! */
/* Note that this is called for all low-level state changes, even if they might map to the same high-level
* UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
* remounted this function will be called too! */
m = u->manager;
@ -2463,12 +2461,6 @@ void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_su
/* Some names are special */
if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
/* The bus might have just become available,
* hence try to connect to it, if we aren't
* yet connected. */
bus_init(m, true);
if (u->type == UNIT_SERVICE &&
!UNIT_IS_ACTIVE_OR_RELOADING(os) &&
!MANAGER_IS_RELOADING(m)) {
@ -2481,8 +2473,6 @@ void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_su
manager_send_unit_plymouth(m, u);
} else {
/* We don't care about D-Bus going down here, since we'll get an asynchronous notification for it
* anyway. */
if (UNIT_IS_INACTIVE_OR_FAILED(ns) &&
!UNIT_IS_INACTIVE_OR_FAILED(os)
@ -2512,17 +2502,15 @@ void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_su
}
manager_recheck_journal(m);
manager_recheck_dbus(m);
unit_trigger_notify(u);
if (!MANAGER_IS_RELOADING(u->manager)) {
/* Maybe we finished startup and are now ready for
* being stopped because unneeded? */
/* Maybe we finished startup and are now ready for being stopped because unneeded? */
unit_check_unneeded(u);
/* Maybe we finished startup, but something we needed
* has vanished? Let's die then. (This happens when
* something BindsTo= to a Type=oneshot unit, as these
* units go directly from starting to inactive,
/* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens when
* something BindsTo= to a Type=oneshot unit, as these units go directly from starting to inactive,
* without ever entering started.) */
unit_check_binds_to(u);
@ -4541,22 +4529,15 @@ int unit_kill_context(
} else if (r > 0) {
/* FIXME: For now, on the legacy hierarchy, we
* will not wait for the cgroup members to die
* if we are running in a container or if this
* is a delegation unit, simply because cgroup
* notification is unreliable in these
* cases. It doesn't work at all in
* containers, and outside of containers it
* can be confused easily by left-over
* directories in the cgroup — which however
* should not exist in non-delegated units. On
* the unified hierarchy that's different,
* there we get proper events. Hence rely on
* them. */
/* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
* we are running in a container or if this is a delegation unit, simply because cgroup
* notification is unreliable in these cases. It doesn't work at all in containers, and outside
* of containers it can be confused easily by left-over directories in the cgroup — which
* however should not exist in non-delegated units. On the unified hierarchy that's different,
* there we get proper events. Hence rely on them. */
if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0 ||
(detect_container() == 0 && !UNIT_CGROUP_BOOL(u, delegate)))
(detect_container() == 0 && !unit_cgroup_delegate(u)))
wait_for_exit = true;
if (send_sighup) {
@ -5006,8 +4987,16 @@ void unit_set_exec_params(Unit *u, ExecParameters *p) {
assert(u);
assert(p);
/* Copy parameters from manager */
p->environment = u->manager->environment;
p->confirm_spawn = manager_get_confirm_spawn(u->manager);
p->cgroup_supported = u->manager->cgroup_supported;
p->prefix = u->manager->prefix;
SET_FLAG(p->flags, EXEC_PASS_LOG_UNIT|EXEC_CHOWN_DIRECTORIES, MANAGER_IS_SYSTEM(u->manager));
/* Copy paramaters from unit */
p->cgroup_path = u->cgroup_path;
SET_FLAG(p->flags, EXEC_CGROUP_DELEGATE, UNIT_CGROUP_BOOL(u, delegate));
SET_FLAG(p->flags, EXEC_CGROUP_DELEGATE, unit_cgroup_delegate(u));
}
int unit_fork_helper_process(Unit *u, const char *name, pid_t *ret) {
@ -5373,6 +5362,34 @@ const char *unit_label_path(Unit *u) {
return p;
}
int unit_pid_attachable(Unit *u, pid_t pid, sd_bus_error *error) {
int r;
assert(u);
/* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
* and not a kernel thread either */
/* First, a simple range check */
if (!pid_is_valid(pid))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Process identifier " PID_FMT " is not valid.", pid);
/* Some extra safety check */
if (pid == 1 || pid == getpid_cached())
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Process " PID_FMT " is a manager processs, refusing.", pid);
/* Don't even begin to bother with kernel threads */
r = is_kernel_thread(pid);
if (r == -ESRCH)
return sd_bus_error_setf(error, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN, "Process with ID " PID_FMT " does not exist.", pid);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to determine whether process " PID_FMT " is a kernel thread: %m", pid);
if (r > 0)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Process " PID_FMT " is a kernel thread, refusing.", pid);
return 0;
}
static const char* const collect_mode_table[_COLLECT_MODE_MAX] = {
[COLLECT_INACTIVE] = "inactive",
[COLLECT_INACTIVE_OR_FAILED] = "inactive-or-failed",

5
src/core/unit.h
View File

@ -568,6 +568,9 @@ struct UnitVTable {
/* True if transient units of this type are OK */
bool can_transient:1;
/* True if cgroup delegation is permissible */
bool can_delegate:1;
/* True if queued jobs of this type should be GC'ed if no other job needs them anymore */
bool gc_jobs:1;
};
@ -803,6 +806,8 @@ bool unit_needs_console(Unit *u);
const char *unit_label_path(Unit *u);
int unit_pid_attachable(Unit *unit, pid_t pid, sd_bus_error *error);
/* Macros which append UNIT= or USER_UNIT= to the message */
#define log_unit_full(unit, level, error, ...) \

10
src/libsystemd/sd-bus/sd-bus.c
View File

@ -3920,7 +3920,15 @@ _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
assert_return(bus->description, -ENXIO);
assert_return(!bus_pid_changed(bus), -ECHILD);
*description = bus->description;
if (bus->description)
*description = bus->description;
else if (bus->is_system)
*description = "system";
else if (bus->is_user)
*description = "user";
else
*description = NULL;
return 0;
}