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service: when we supervise a process, ensure it is our child

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This commit is contained in:
Lennart Poettering 2010-06-18 22:05:29 +02:00
parent 3d88bf660d
commit e55224ca65
2 changed files with 13 additions and 33 deletions
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2
fixme
View File

@ -65,8 +65,6 @@
* discuss NOTIFY_SOCKET, make it configurable? security implications?
* when reading pid for watching, verify we are parent
Regularly:
* look for close() vs. close_nointr() vs. close_nointr_nofail()

44
src/service.c
View File

@ -127,6 +127,8 @@ static void service_unwatch_main_pid(Service *s) {
}
static int service_set_main_pid(Service *s, pid_t pid) {
pid_t ppid;
assert(s);
if (pid <= 1)
@ -135,26 +137,16 @@ static int service_set_main_pid(Service *s, pid_t pid) {
if (pid == getpid())
return -EINVAL;
if (get_parent_of_pid(pid, &ppid) >= 0 && ppid != getpid())
log_warning("%s: Supervising process %lu which is not our child. We'll most likely not notice when it exits.",
s->meta.id, (unsigned long) pid);
s->main_pid = pid;
s->main_pid_known = true;
return 0;
}
static int service_set_control_pid(Service *s, pid_t pid) {
assert(s);
if (pid <= 1)
return -EINVAL;
if (pid == getpid())
return -EINVAL;
s->control_pid = pid;
return 0;
}
static void service_close_socket_fd(Service *s) {
assert(s);
@ -1485,7 +1477,6 @@ fail:
static void service_enter_stop(Service *s, bool success) {
int r;
pid_t pid;
assert(s);
@ -1502,10 +1493,9 @@ static void service_enter_stop(Service *s, bool success) {
false,
!s->permissions_start_only,
!s->root_directory_start_only,
&pid)) < 0)
&s->control_pid)) < 0)
goto fail;
service_set_control_pid(s, pid);
service_set_state(s, SERVICE_STOP);
} else
service_enter_signal(s, SERVICE_STOP_SIGTERM, true);
@ -1535,7 +1525,6 @@ static void service_enter_running(Service *s, bool success) {
static void service_enter_start_post(Service *s) {
int r;
pid_t pid;
assert(s);
service_unwatch_control_pid(s);
@ -1548,10 +1537,9 @@ static void service_enter_start_post(Service *s) {
false,
!s->permissions_start_only,
!s->root_directory_start_only,
&pid)) < 0)
&s->control_pid)) < 0)
goto fail;
service_set_control_pid(s, pid);
service_set_state(s, SERVICE_START_POST);
} else
service_enter_running(s, true);
@ -1601,7 +1589,7 @@ static void service_enter_start(Service *s) {
s->control_command_id = SERVICE_EXEC_START;
s->control_command = s->exec_command[SERVICE_EXEC_START];
service_set_control_pid(s, pid);
s->control_pid = pid;
service_set_state(s, SERVICE_START);
} else if (s->type == SERVICE_FINISH ||
@ -1629,7 +1617,6 @@ fail:
static void service_enter_start_pre(Service *s) {
int r;
pid_t pid;
assert(s);
@ -1643,10 +1630,9 @@ static void service_enter_start_pre(Service *s) {
false,
!s->permissions_start_only,
!s->root_directory_start_only,
&pid)) < 0)
&s->control_pid)) < 0)
goto fail;
service_set_control_pid(s, pid);
service_set_state(s, SERVICE_START_PRE);
} else
service_enter_start(s);
@ -1678,7 +1664,6 @@ fail:
static void service_enter_reload(Service *s) {
int r;
pid_t pid;
assert(s);
@ -1692,10 +1677,9 @@ static void service_enter_reload(Service *s) {
false,
!s->permissions_start_only,
!s->root_directory_start_only,
&pid)) < 0)
&s->control_pid)) < 0)
goto fail;
service_set_control_pid(s, pid);
service_set_state(s, SERVICE_RELOAD);
} else
service_enter_running(s, true);
@ -1709,7 +1693,6 @@ fail:
static void service_run_next(Service *s, bool success) {
int r;
pid_t pid;
assert(s);
assert(s->control_command);
@ -1728,10 +1711,9 @@ static void service_run_next(Service *s, bool success) {
false,
!s->permissions_start_only,
!s->root_directory_start_only,
&pid)) < 0)
&s->control_pid)) < 0)
goto fail;
service_set_control_pid(s, pid);
return;
fail:
@ -1904,7 +1886,7 @@ static int service_deserialize_item(Unit *u, const char *key, const char *value,
if ((r = parse_pid(value, &pid)) < 0)
log_debug("Failed to parse control-pid value %s", value);
else
service_set_control_pid(s, pid);
s->control_pid = pid;
} else if (streq(key, "main-pid")) {
pid_t pid;