check for invalid handles in dlsym/dlclose

this is wasteful and useless from a standpoint of sane programs, but
it is required by the standard, and the current requirements were
upheld with the closure of Austin Group issue #639:
http://austingroupbugs.net/view.php?id=639

diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index 935367e..782e979 100644 (file)
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -1091,6 +1091,15 @@ end:
        return p;
 }
 
+static int invalid_dso_handle(struct dso *h)
+{
+       struct dso *p;
+       for (p=head; p; p=p->next) if (h==p) return 0;
+       snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
+       errflag = 1;
+       return 1;
+}
+
 static void *do_dlsym(struct dso *p, const char *s, void *ra)
 {
        size_t i;
@@ -1110,6 +1119,7 @@ static void *do_dlsym(struct dso *p, const char *s, void *ra)
                        return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value});
                return def.dso->base + def.sym->st_value;
        }
+       if (invalid_dso_handle(p)) return 0;
        if (p->ghashtab) {
                gh = gnu_hash(s);
                sym = gnu_lookup(s, gh, p);
@@ -1236,6 +1246,12 @@ int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void
        return ret;
 }
 #else
+static int invalid_dso_handle(struct dso *h)
+{
+       snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
+       errflag = 1;
+       return 1;
+}
 void *dlopen(const char *file, int mode)
 {
        return 0;
@@ -1259,5 +1275,5 @@ char *dlerror()
 
 int dlclose(void *p)
 {
-       return 0;
+       return invalid_dso_handle(p);
 }