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Fix use-after free in thread stopping code

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This commit is contained in:
Maria Matejka 2023-05-09 23:31:47 +02:00
parent 794f555f63
commit 92d934f0d1
1 changed files with 34 additions and 7 deletions
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41
sysdep/unix/io-loop.c
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@ -294,6 +294,13 @@ pipe_pollin(struct pipe *p, struct pfd *pfd)
BUFFER_PUSH(pfd->loop) = NULL;
}
void
pipe_free(struct pipe *p)
{
close(p->fd[0]);
close(p->fd[1]);
}
static inline void
wakeup_init(struct bird_thread *loop)
{
@ -312,6 +319,12 @@ wakeup_do_kick(struct bird_thread *loop)
pipe_kick(&loop->wakeup);
}
static inline void
wakeup_free(struct bird_thread *loop)
{
pipe_free(&loop->wakeup);
}
static inline _Bool
birdloop_try_ping(struct birdloop *loop, u32 ltt)
{
@ -918,14 +931,24 @@ static void
bird_thread_cleanup(void *_thr)
{
struct bird_thread *thr = _thr;
struct birdloop *meta = thr->meta;
ASSERT_DIE(birdloop_inside(&main_birdloop));
/* Free the meta loop */
thr->meta->thread = NULL;
birdloop_free(thr->meta);
/* Wait until the thread actually finishes */
ASSERT_DIE(meta);
birdloop_enter(meta);
birdloop_leave(meta);
/* No more wakeup */
wakeup_free(thr);
/* Thread attributes no longer needed */
pthread_attr_destroy(&thr->thread_attr);
/* Free the meta loop */
thr->meta->thread = NULL;
thr->meta = NULL;
birdloop_free(meta);
}
static struct bird_thread *
@ -1035,6 +1058,10 @@ bird_thread_shutdown(void * _ UNUSED)
/* Leave the thread-dropper loop as we aren't going to return. */
birdloop_leave(thread_dropper);
/* Last try to run the priority event list; ruin it then to be extra sure */
ev_run_list(&this_thread->priority_events);
memset(&this_thread->priority_events, 0xa5, sizeof(this_thread->priority_events));
/* Drop loops including the thread dropper itself */
while (!EMPTY_LIST(thr->loops))
{
@ -1054,8 +1081,8 @@ bird_thread_shutdown(void * _ UNUSED)
wakeup_do_kick(SKIP_BACK(struct bird_thread, n, HEAD(group->threads)));
UNLOCK_DOMAIN(attrs, group->domain);
/* Stop the meta loop */
birdloop_leave(thr->meta);
/* Request thread cleanup from main loop */
ev_send_loop(&main_birdloop, &thr->cleanup_event);
/* Local pages not needed anymore */
flush_local_pages();
@ -1063,8 +1090,8 @@ bird_thread_shutdown(void * _ UNUSED)
/* Unregister from RCU */
rcu_thread_stop(&thr->rcu);
/* Request thread cleanup from main loop */
ev_send_loop(&main_birdloop, &thr->cleanup_event);
/* Now we can be cleaned up */
birdloop_leave(thr->meta);
/* Exit! */
pthread_exit(NULL);