openresty/patches/nginx-1.15.5-socket_cloexec.patch

diff --git a/auto/unix b/auto/unix
index 10835f6c..b5b33bb3 100644
--- a/auto/unix
+++ b/auto/unix
@@ -990,3 +990,27 @@ ngx_feature_test='struct addrinfo *res;
                   if (getaddrinfo("localhost", NULL, NULL, &res) != 0) return 1;
                   freeaddrinfo(res)'
 . auto/feature
+
+ngx_feature="SOCK_CLOEXEC support"
+ngx_feature_name="NGX_HAVE_SOCKET_CLOEXEC"
+ngx_feature_run=no
+ngx_feature_incs="#include <sys/types.h>
+                  #include <sys/socket.h>"
+ngx_feature_path=
+ngx_feature_libs=
+ngx_feature_test="int fd;
+                  fd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);"
+. auto/feature
+
+ngx_feature="FD_CLOEXEC support"
+ngx_feature_name="NGX_HAVE_FD_CLOEXEC"
+ngx_feature_run=no
+ngx_feature_incs="#include <sys/types.h>
+                  #include <sys/socket.h>
+                  #include <fcntl.h>"
+ngx_feature_path=
+ngx_feature_libs=
+ngx_feature_test="int fd;
+                  fd = socket(AF_INET, SOCK_STREAM, 0);
+                  fcntl(fd, F_SETFD, FD_CLOEXEC);"
+. auto/feature
diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index cd55520c..438e0806 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -4466,8 +4466,14 @@ ngx_tcp_connect(ngx_resolver_connection_t *rec)
     ngx_event_t       *rev, *wev;
     ngx_connection_t  *c;
 
+#if (NGX_HAVE_SOCKET_CLOEXEC)
+    s = ngx_socket(rec->sockaddr->sa_family, SOCK_STREAM | SOCK_CLOEXEC, 0);
+
+#else
     s = ngx_socket(rec->sockaddr->sa_family, SOCK_STREAM, 0);
 
+#endif
+
     ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &rec->log, 0, "TCP socket %d", s);
 
     if (s == (ngx_socket_t) -1) {
@@ -4494,6 +4500,15 @@ ngx_tcp_connect(ngx_resolver_connection_t *rec)
         goto failed;
     }
 
+#if (NGX_HAVE_FD_CLOEXEC)
+    if (ngx_cloexec(s) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, &rec->log, ngx_socket_errno,
+                      ngx_cloexec_n " failed");
+
+        goto failed;
+    }
+#endif
+
     rev = c->read;
     wev = c->write;
 
diff --git a/src/event/ngx_event_accept.c b/src/event/ngx_event_accept.c
index 77563709..5827b9d0 100644
--- a/src/event/ngx_event_accept.c
+++ b/src/event/ngx_event_accept.c
@@ -62,7 +62,9 @@ ngx_event_accept(ngx_event_t *ev)
 
 #if (NGX_HAVE_ACCEPT4)
         if (use_accept4) {
-            s = accept4(lc->fd, &sa.sockaddr, &socklen, SOCK_NONBLOCK);
+            s = accept4(lc->fd, &sa.sockaddr, &socklen,
+                        SOCK_NONBLOCK | SOCK_CLOEXEC);
+
         } else {
             s = accept(lc->fd, &sa.sockaddr, &socklen);
         }
@@ -202,6 +204,16 @@ ngx_event_accept(ngx_event_t *ev)
                     ngx_close_accepted_connection(c);
                     return;
                 }
+
+#if (NGX_HAVE_FD_CLOEXEC)
+                if (ngx_cloexec(s) == -1) {
+                    ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
+                                  ngx_cloexec_n " failed");
+                    ngx_close_accepted_connection(c);
+                    return;
+                }
+#endif
+
             }
         }
 
diff --git a/src/event/ngx_event_connect.c b/src/event/ngx_event_connect.c
index c5bb8068..cf33b1d2 100644
--- a/src/event/ngx_event_connect.c
+++ b/src/event/ngx_event_connect.c
@@ -38,8 +38,15 @@ ngx_event_connect_peer(ngx_peer_connection_t *pc)
 
     type = (pc->type ? pc->type : SOCK_STREAM);
 
+#if (NGX_HAVE_SOCKET_CLOEXEC)
+    s = ngx_socket(pc->sockaddr->sa_family, type | SOCK_CLOEXEC, 0);
+
+#else
     s = ngx_socket(pc->sockaddr->sa_family, type, 0);
 
+#endif
+
+
     ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0, "%s socket %d",
                    (type == SOCK_STREAM) ? "stream" : "dgram", s);
 
@@ -80,6 +87,15 @@ ngx_event_connect_peer(ngx_peer_connection_t *pc)
         goto failed;
     }
 
+#if (NGX_HAVE_FD_CLOEXEC)
+    if (ngx_cloexec(s) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
+                      ngx_cloexec_n " failed");
+
+        goto failed;
+    }
+#endif
+
     if (pc->local) {
 
 #if (NGX_HAVE_TRANSPARENT_PROXY)
diff --git a/src/os/unix/ngx_socket.h b/src/os/unix/ngx_socket.h
index fcc51533..d1eebf47 100644
--- a/src/os/unix/ngx_socket.h
+++ b/src/os/unix/ngx_socket.h
@@ -38,6 +38,17 @@ int ngx_blocking(ngx_socket_t s);
 
 #endif
 
+#if (NGX_HAVE_FD_CLOEXEC)
+
+#define ngx_cloexec(s)      fcntl(s, F_SETFD, FD_CLOEXEC)
+#define ngx_cloexec_n       "fcntl(FD_CLOEXEC)"
+
+/* at least FD_CLOEXEC is required to ensure connection fd is closed
+ * after execve */
+#define HAVE_SOCKET_CLOEXEC_PATCH  1
+
+#endif
+
 int ngx_tcp_nopush(ngx_socket_t s);
 int ngx_tcp_push(ngx_socket_t s);