commit d6c678ca90d6f7843a9186515fa38d9eec467ff6
author Elliott Hughes <enh@google.com> Tue Jun 27 17:01:57 2017 -0700
committer Elliott Hughes <enh@google.com> Mon Sep 18 16:09:43 2017 -0700
tree bb6316d48f1ab523c0520bcba316b2ba232dfa34
parent 0d5d0746e8b88dab66038d6150cb92b62467aac1

Support larger guard regions.

This also fixes a long-standing bug where the guard region would be taken
out of the stack itself, rather than being -- as POSIX demands -- additional
space after the stack. Historically a 128KiB stack with a 256KiB guard would
have given you an immediate crash.

Bug: http://b/38413813
Test: builds, boots
Change-Id: Idd12a3899be1d92fea3d3e0fa6882ca2216bd79c

libc/bionic/pthread_attr.cpp

diff --git a/libc/bionic/pthread_attr.cpp b/libc/bionic/pthread_attr.cpp
index 4b6a8f2..39d6e09 100644
--- a/libc/bionic/pthread_attr.cpp
+++ b/libc/bionic/pthread_attr.cpp
@@ -43,7 +43,7 @@
   attr->flags = 0;
   attr->stack_base = NULL;
   attr->stack_size = PTHREAD_STACK_SIZE_DEFAULT;
-  attr->guard_size = PAGE_SIZE;
+  attr->guard_size = PTHREAD_GUARD_SIZE;
   attr->sched_policy = SCHED_NORMAL;
   attr->sched_priority = 0;
   return 0;