Linux: Fix the sandbox error message when the helper binary is missing.

content/browser/zygote_host_linux.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/zygote_host_linux.h"
 
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ skipping 103 matching lines @@
   cmd_line.CopySwitchesFrom(browser_command_line, kForwardSwitches,
                             arraysize(kForwardSwitches));
 
   content::GetContentClient()->browser()->AppendExtraCommandLineSwitches(
       &cmd_line, -1);
 
   sandbox_binary_ = sandbox_cmd.c_str();
 
   if (!sandbox_cmd.empty()) {
     struct stat st;
-    if (stat(sandbox_binary_.c_str(), &st) == 0 &&
-        access(sandbox_binary_.c_str(), X_OK) == 0 &&
+    if (stat(sandbox_binary_.c_str(), &st) != 0) {
+      LOG(FATAL) << "The SUID sandbox helper binary is missing: "
+                 << sandbox_binary_ << " Aborting now.";
+    }
+
+    if (access(sandbox_binary_.c_str(), X_OK) == 0 &&
         (st.st_uid == 0) &&
         (st.st_mode & S_ISUID) &&
         (st.st_mode & S_IXOTH)) {
       using_suid_sandbox_ = true;
       cmd_line.PrependWrapper(sandbox_binary_);
 
       SaveSUIDUnsafeEnvironmentVariables();
     } else {
       LOG(FATAL) << "The SUID sandbox helper binary was found, but is not "
                     "configured correctly. Rather than run without sandboxing "
@@ skipping 234 matching lines @@
       !read_pickle.ReadInt(&iter, &tmp_exit_code)) {
     LOG(WARNING) << "Error parsing GetTerminationStatus response from zygote.";
     return base::TERMINATION_STATUS_NORMAL_TERMINATION;
   }
 
   if (exit_code)
     *exit_code = tmp_exit_code;
 
   return static_cast<base::TerminationStatus>(status);
 }