diff --git a/libc/bionic/dl_iterate_phdr_static.cpp b/libc/bionic/dl_iterate_phdr_static.cpp
index 155a7a0..2196ac8 100644
--- a/libc/bionic/dl_iterate_phdr_static.cpp
+++ b/libc/bionic/dl_iterate_phdr_static.cpp
@@ -62,6 +62,11 @@
 
   // Try the VDSO if that didn't work.
   ElfW(Ehdr)* ehdr_vdso = reinterpret_cast<ElfW(Ehdr)*>(getauxval(AT_SYSINFO_EHDR));
+  if (ehdr_vdso == nullptr) {
+    // There is no VDSO, so there's nowhere left to look.
+    return rc;
+  }
+
   struct dl_phdr_info vdso_info;
   vdso_info.dlpi_addr = 0;
   vdso_info.dlpi_name = NULL;
diff --git a/libc/bionic/sigaction.cpp b/libc/bionic/sigaction.cpp
index e1a031f..920303b 100644
--- a/libc/bionic/sigaction.cpp
+++ b/libc/bionic/sigaction.cpp
@@ -28,8 +28,10 @@
 
 #include <signal.h>
 
+extern "C" void __restore_rt(void);
+extern "C" void __restore(void);
+
 #if __LP64__
-extern "C" void __rt_sigreturn(void);
 extern "C" int __rt_sigaction(int, const struct __kernel_sigaction*, struct __kernel_sigaction*, size_t);
 #else
 extern "C" int __sigaction(int, const struct sigaction*, struct sigaction*);
@@ -47,7 +49,7 @@
 
     if (!(kernel_new_action.sa_flags & SA_RESTORER)) {
       kernel_new_action.sa_flags |= SA_RESTORER;
-      kernel_new_action.sa_restorer = &__rt_sigreturn;
+      kernel_new_action.sa_restorer = &__restore_rt;
     }
 #endif
   }
@@ -71,6 +73,20 @@
 #else
   // The 32-bit ABI is broken. struct sigaction includes a too-small sigset_t.
   // TODO: if we also had correct struct sigaction definitions available, we could copy in and out.
-  return __sigaction(signal, bionic_new_action, bionic_old_action);
+  struct sigaction kernel_new_action;
+  if (bionic_new_action != NULL) {
+    kernel_new_action.sa_flags = bionic_new_action->sa_flags;
+    kernel_new_action.sa_handler = bionic_new_action->sa_handler;
+    kernel_new_action.sa_mask = bionic_new_action->sa_mask;
+#ifdef SA_RESTORER
+    kernel_new_action.sa_restorer = bionic_new_action->sa_restorer;
+
+    if (!(kernel_new_action.sa_flags & SA_RESTORER)) {
+      kernel_new_action.sa_flags |= SA_RESTORER;
+      kernel_new_action.sa_restorer = (kernel_new_action.sa_flags & SA_SIGINFO) ? &__restore_rt : &__restore;
+    }
+#endif
+  }
+  return __sigaction(signal, (bionic_new_action != NULL) ? &kernel_new_action : NULL, bionic_old_action);
 #endif
 }