--- old/src/jdk.hotspot.agent/share/native/libsaproc/ps_core_common.c	2020-08-04 21:19:50.990000000 +0900
+++ new/src/jdk.hotspot.agent/share/native/libsaproc/ps_core_common.c	2020-08-04 21:19:50.860000000 +0900
@@ -41,6 +41,13 @@
 #include "sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext.h"
 #endif
 
+// Define a segment permission flag allowing read.
+#ifdef PF_R
+#define MAP_R_FLAG PF_R
+#else
+#define MAP_R_FLAG 0
+#endif
+
 #ifdef LINUX
 // I have no idea why this function is called ps_pread() on macos but ps_pdread on linux.
 #define ps_pread ps_pdread
@@ -113,7 +120,7 @@
   }
 }
 
-static map_info* allocate_init_map(int fd, off_t offset, uintptr_t vaddr, size_t memsz) {
+static map_info* allocate_init_map(int fd, off_t offset, uintptr_t vaddr, size_t memsz, uint32_t flags) {
   map_info* map;
   if ( (map = (map_info*) calloc(1, sizeof(map_info))) == NULL) {
     print_debug("can't allocate memory for map_info\n");
@@ -125,14 +132,15 @@
   map->offset = offset;
   map->vaddr  = vaddr;
   map->memsz  = memsz;
+  map->flags  = flags;
   return map;
 }
 
 // add map info with given fd, offset, vaddr and memsz
 map_info* add_map_info(struct ps_prochandle* ph, int fd, off_t offset,
-                       uintptr_t vaddr, size_t memsz) {
+                       uintptr_t vaddr, size_t memsz, uint32_t flags) {
   map_info* map;
-  if ((map = allocate_init_map(fd, offset, vaddr, memsz)) == NULL) {
+  if ((map = allocate_init_map(fd, offset, vaddr, memsz, flags)) == NULL) {
     return NULL;
   }
 
@@ -149,7 +157,7 @@
                              uintptr_t vaddr, size_t memsz) {
   map_info* map;
   if ((map = allocate_init_map(ph->core->classes_jsa_fd,
-                               offset, vaddr, memsz)) == NULL) {
+                               offset, vaddr, memsz, MAP_R_FLAG)) == NULL) {
     return NULL;
   }