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udev: destroy manager before cleaning environment 

Due to our _cleanup_ usage for the udev manager, it will be destroyed
after the "exit:" label has finished. Therefore, it is the last
destruction done in main(). This has two side-effects:
  - mac_selinux is destroyed before the udev manager is, possible causing
    use-after-free if the manager-cleanup accesses selinux data
  - log_close() is called *before* the manager is destroyed, possibly
    re-opening the log if you use --debug (and thus not re-applying the
    --debug option)

Avoid this by moving the manager-handling into a new function called
run(). This function will be left before we enter the "exit:" label in
main(), hence, the manager object will be destroyed early.
This commit is contained in:
David Herrmann 2015-07-01 19:25:30 +02:00
parent 0204c4bd69
commit 077fc5e260
1 changed files with 36 additions and 28 deletions
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64
src/udev/udevd.c
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@ -1608,8 +1608,42 @@ static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cg
return 0;
}
int main(int argc, char *argv[]) {
static int run(int fd_ctrl, int fd_uevent, const char *cgroup) {
_cleanup_(manager_freep) Manager *manager = NULL;
int r;
r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup);
if (r < 0) {
r = log_error_errno(r, "failed to allocate manager object: %m");
goto exit;
}
r = udev_rules_apply_static_dev_perms(manager->rules);
if (r < 0)
log_error_errno(r, "failed to apply permissions on static device nodes: %m");
(void) sd_notify(false,
"READY=1\n"
"STATUS=Processing...");
r = sd_event_loop(manager->event);
if (r < 0) {
log_error_errno(r, "event loop failed: %m");
goto exit;
}
sd_event_get_exit_code(manager->event, &r);
exit:
sd_notify(false,
"STOPPING=1\n"
"STATUS=Shutting down...");
if (manager)
udev_ctrl_cleanup(manager->ctrl);
return r;
}
int main(int argc, char *argv[]) {
_cleanup_free_ char *cgroup = NULL;
int r, fd_ctrl, fd_uevent;
@ -1714,35 +1748,9 @@ int main(int argc, char *argv[]) {
write_string_file("/proc/self/oom_score_adj", "-1000");
}
r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup);
if (r < 0) {
r = log_error_errno(r, "failed to allocate manager object: %m");
goto exit;
}
r = udev_rules_apply_static_dev_perms(manager->rules);
if (r < 0)
log_error_errno(r, "failed to apply permissions on static device nodes: %m");
(void) sd_notify(false,
"READY=1\n"
"STATUS=Processing...");
r = sd_event_loop(manager->event);
if (r < 0) {
log_error_errno(r, "event loop failed: %m");
goto exit;
}
sd_event_get_exit_code(manager->event, &r);
r = run(fd_ctrl, fd_uevent, cgroup);
exit:
sd_notify(false,
"STOPPING=1\n"
"STATUS=Shutting down...");
if (manager)
udev_ctrl_cleanup(manager->ctrl);
mac_selinux_finish();
log_close();
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;