Don't use 64KB of stack on a single call.

base/files/file_util.cc

 // Copyright (c) 2012 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 "base/files/file_util.h"
 
 #if defined(OS_WIN)
 #include <io.h>
 #endif
 #include <stdio.h>
@@ skipping 121 matching lines @@
                       size_t max_size) {
   if (contents)
     contents->clear();
   if (path.ReferencesParent())
     return false;
   FILE* file = OpenFile(path, "rb");
   if (!file) {
     return false;
   }
 
-  char buf[1 << 16];
+  const size_t kBufferSize = 1 << 16;
+  scoped_ptr<char[]> buf(new char[kBufferSize]);
   size_t len;
   size_t size = 0;
   bool read_status = true;
 
   // Many files supplied in |path| have incorrect size (proc files etc).
   // Hence, the file is read sequentially as opposed to a one-shot read.
-  while ((len = fread(buf, 1, sizeof(buf), file)) > 0) {
+  while ((len = fread(buf.get(), 1, kBufferSize, file)) > 0) {
     if (contents)
-      contents->append(buf, std::min(len, max_size - size));
+      contents->append(buf.get(), std::min(len, max_size - size));
 
     if ((max_size - size) < len) {
       read_status = false;
       break;
     }
 
     size += len;
   }
   read_status = read_status && !ferror(file);
   CloseFile(file);
@@ skipping 89 matching lines @@
     if (!PathExists(new_path) &&
         (!have_suffix || !PathExists(FilePath(new_path.value() + suffix)))) {
       return count;
     }
   }
 
   return -1;
 }
 
 }  // namespace base