diff options
Diffstat (limited to 'ldso/dynlink.c')
| -rw-r--r-- | ldso/dynlink.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/ldso/dynlink.c b/ldso/dynlink.c index 777be489..20328285 100644 --- a/ldso/dynlink.c +++ b/ldso/dynlink.c @@ -124,6 +124,7 @@ static int runtime; static int ldd_mode; static int ldso_fail; static int noload; +static int shutting_down; static jmp_buf *rtld_fail; static pthread_rwlock_t lock; static struct debug debug; @@ -1350,7 +1351,18 @@ void __libc_exit_fini() { struct dso *p; size_t dyn[DYN_CNT]; + int self = __pthread_self()->tid; + + /* Take both locks before setting shutting_down, so that + * either lock is sufficient to read its value. The lock + * order matches that in dlopen to avoid deadlock. */ + pthread_rwlock_wrlock(&lock); + pthread_mutex_lock(&init_fini_lock); + shutting_down = 1; + pthread_rwlock_unlock(&lock); for (p=fini_head; p; p=p->fini_next) { + while (p->ctor_visitor && p->ctor_visitor!=self) + pthread_cond_wait(&ctor_cond, &init_fini_lock); if (!p->constructed) continue; decode_vec(p->dynv, dyn, DYN_CNT); if (dyn[0] & (1<<DT_FINI_ARRAY)) { @@ -1431,7 +1443,7 @@ static void do_init_fini(struct dso **queue) pthread_mutex_lock(&init_fini_lock); for (i=0; (p=queue[i]); i++) { - while (p->ctor_visitor && p->ctor_visitor!=self) + while ((p->ctor_visitor && p->ctor_visitor!=self) || shutting_down) pthread_cond_wait(&ctor_cond, &init_fini_lock); if (p->ctor_visitor || p->constructed) continue; @@ -1937,6 +1949,10 @@ void *dlopen(const char *file, int mode) __inhibit_ptc(); p = 0; + if (shutting_down) { + error("Cannot dlopen while program is exiting."); + goto end; + } orig_tls_tail = tls_tail; orig_tls_cnt = tls_cnt; orig_tls_offset = tls_offset; |