src/jdk.hotspot.agent/linux/native/libsaproc/ps_core.c

rev 13166 : read/write APIs in class os shall return ssize_t

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.

@@ -821,19 +821,24 @@
         if (add_map_info(ph, ph->core->exec_fd, exec_php->p_offset, exec_php->p_vaddr, exec_php->p_filesz) == NULL) goto err;
       }
       break;
     }
 
-    // read the interpreter and it's segments
+    // read the interpreter and its segments
     case PT_INTERP: {
+      ssize_t res;
       char interp_name[BUF_SIZE + 1];
 
       // BUF_SIZE is PATH_MAX + NAME_MAX + 1.
       if (exec_php->p_filesz > BUF_SIZE) {
         goto err;
       }
-      pread(ph->core->exec_fd, interp_name, exec_php->p_filesz, exec_php->p_offset);
+      res = pread(ph->core->exec_fd, interp_name, exec_php->p_filesz, exec_php->p_offset);
+      if (res < 0) {
+        print_debug("couldn't read ELF interpreter name\n");
+        goto err;
+      }
       interp_name[exec_php->p_filesz] = '\0';
       print_debug("ELF interpreter %s\n", interp_name);
       // read interpreter segments as well
       if ((ph->core->interp_fd = pathmap_open(interp_name)) < 0) {
         print_debug("can't open runtime loader\n");