opcache fixing w/x pages creation on freebsd 13.1 and above.

By default, the system allows these but admin can disable them system wide.
However the procctl api permits to control it per process.

Closes GH-9896.

Author: devnexen

NEWS

@@ -45,6 +45,8 @@ PHP                                                                        NEWS
     (Arnaud, Kapitan Oczywisty)
   . Made opcache.preload_user always optional in the cli and phpdbg SAPIs.
     (Arnaud)
+  . Allows W/X bits on page creation on FreeBSD despite system settings.
+    (David Carlier)
 
 - PCNTL:
   . SA_ONSTACK is now set for pcntl_signal. (Kévin Dunglas)

configure.ac

@@ -410,6 +410,7 @@ sys/file.h \
 sys/mman.h \
 sys/mount.h \
 sys/poll.h \
+sys/procctl.h \
 sys/resource.h \
 sys/select.h \
 sys/socket.h \

ext/opcache/shared_alloc_mmap.c

@@ -34,6 +34,9 @@
 #endif
 
 #include "zend_execute.h"
+#ifdef HAVE_SYS_PROCCTL_H
+#include <sys/procctl.h>
+#endif
 
 #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
 # define MAP_ANONYMOUS MAP_ANON
@@ -156,6 +159,12 @@ static int create_segments(size_t requested_size, zend_shared_segment ***shared_
 	zend_shared_segment *shared_segment;
 	int flags = PROT_READ | PROT_WRITE, fd = -1;
 	void *p;
+#if defined(HAVE_PROCCTL) && defined(PROC_WXMAP_CTL)
+	int enable_wxmap = PROC_WX_MAPPINGS_PERMIT;
+	if (procctl(P_PID, getpid(), PROC_WXMAP_CTL, &enable_wxmap) == -1) {
+		return ALLOC_FAILURE;
+	}
+#endif
 #ifdef PROT_MPROTECT
 	flags |= PROT_MPROTECT(PROT_EXEC);
 #endif