Fix a couple more cases of missing CLOEXEC.

The debuggerd case can probably never happen, because you're crashing at this
point anyway. The system property one seems possible though.

Bug: 18186310

(cherry picked from commit 0dc39f9952c5e3a3121ea77357bb264ef0f8ded7)

Change-Id: I3e84488fc246f6c28cbd82e96d0cd4343a12c28a
diff --git a/libc/bionic/system_properties.cpp b/libc/bionic/system_properties.cpp
index a564c39..0e16bf3 100644
--- a/libc/bionic/system_properties.cpp
+++ b/libc/bionic/system_properties.cpp
@@ -475,8 +475,8 @@
 
 static int send_prop_msg(const prop_msg *msg)
 {
-    const int fd = socket(AF_LOCAL, SOCK_STREAM, 0);
-    if (fd < 0) {
+    const int fd = socket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
+    if (fd == -1) {
         return -1;
     }
 
diff --git a/linker/debugger.cpp b/linker/debugger.cpp
index 6565985..ac466a5 100644
--- a/linker/debugger.cpp
+++ b/linker/debugger.cpp
@@ -215,7 +215,7 @@
     return;
   }
 
-  int s = socket_abstract_client(DEBUGGER_SOCKET_NAME, SOCK_STREAM);
+  int s = socket_abstract_client(DEBUGGER_SOCKET_NAME, SOCK_STREAM | SOCK_CLOEXEC);
   if (s == -1) {
     __libc_format_log(ANDROID_LOG_FATAL, "libc", "Unable to open connection to debuggerd: %s",
                       strerror(errno));