fix race condition in dlopen
orig_tail was being saved before the lock was obtained, allowing
dlopen failure to roll-back other dlopens that had succeeded.
diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index e09f071..2bbd492 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -886,7 +886,7 @@
void *dlopen(const char *file, int mode)
{
- struct dso *volatile p, *orig_tail = tail, *next;
+ struct dso *volatile p, *orig_tail, *next;
size_t i;
int cs;
@@ -895,6 +895,8 @@
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
pthread_rwlock_wrlock(&lock);
+ orig_tail = tail;
+
if (setjmp(rtld_fail)) {
/* Clean up anything new that was (partially) loaded */
if (p->deps) for (i=0; p->deps[i]; i++)