commit ef115003012f61cf5539fdfeb201b98e4a92f610
author Yabin Cui <yabinc@google.com> Mon Mar 30 20:03:57 2015 -0700
committer Yabin Cui <yabinc@google.com> Mon Mar 30 20:51:39 2015 -0700
tree d546925be11de056c9c2611fb75d91273cd10303
parent 8225ad63fac7c5cc298884c101a344959b87dc39

Revert "Revert "add guard pages to the internal signal stacks""

This reverts commit a3125fd1396a09a7fc4872dc4653f342150a3deb.
And Fix the prctl() problem that cause system crash.

Change-Id: Icc8d12d848cfba881a7984ca2827fd81be41f9fd

libc/bionic/pthread_exit.cpp

diff --git a/libc/bionic/pthread_exit.cpp b/libc/bionic/pthread_exit.cpp
index 1de85f5..ceda931 100644
--- a/libc/bionic/pthread_exit.cpp
+++ b/libc/bionic/pthread_exit.cpp
@@ -87,7 +87,7 @@
     sigaltstack(&ss, NULL);
 
     // Free it.
-    munmap(thread->alternate_signal_stack, SIGSTKSZ);
+    munmap(thread->alternate_signal_stack, SIGNAL_STACK_SIZE);
     thread->alternate_signal_stack = NULL;
   }