From 7829f42a2c8944555439380498ab8b924d0f2070 Mon Sep 17 00:00:00 2001
From: James Y Knight <jyknight@google.com>
Date: Thu, 11 Jul 2019 11:48:08 -0400
Subject: [PATCH] fix sigaltstack to ignore ss_size with SS_DISABLE, per POSIX

---
 src/signal/sigaltstack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/signal/sigaltstack.c b/src/signal/sigaltstack.c
index cfa3f5c1..d3a6e821 100644
--- a/src/signal/sigaltstack.c
+++ b/src/signal/sigaltstack.c
@@ -5,7 +5,7 @@
 int sigaltstack(const stack_t *restrict ss, stack_t *restrict old)
 {
 	if (ss) {
-		if (ss->ss_size < MINSIGSTKSZ) {
+		if (!(ss->ss_flags & SS_DISABLE) && ss->ss_size < MINSIGSTKSZ) {
 			errno = ENOMEM;
 			return -1;
 		}
-- 
2.25.1