crypto: Merge with security packagerefactor

1 files changed, 0 insertions, 49 deletions

diff --git a/security/cache.go b/security/cache.go
deleted file mode 100644
index d0c60b1..0000000
--- a/security/cache.go
+++ /dev/null
@@ -1,49 +0,0 @@
-/*
- * cache.go - Handles cache clearing and management.
- *
- * Copyright 2017 Google Inc.
- * Author: Joe Richey (joerichey@google.com)
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may not
- * use this file except in compliance with the License. You may obtain a copy of
- * the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations under
- * the License.
- */
-
-package security
-
-import (
-	"log"
-	"os"
-
-	"golang.org/x/sys/unix"
-)
-
-// DropFilesystemCache instructs the kernel to free the reclaimable inodes and
-// dentries. This has the effect of making encrypted directories whose keys are
-// not present no longer accessible. Requires root privileges.
-func DropFilesystemCache() error {
-	// Dirty reclaimible inodes must be synced so that they will be freed.
-	log.Print("syncing changes to filesystem")
-	unix.Sync()
-
-	// See: https://www.kernel.org/doc/Documentation/sysctl/vm.txt
-	log.Print("freeing reclaimable inodes and dentries")
-	file, err := os.OpenFile("/proc/sys/vm/drop_caches", os.O_WRONLY|os.O_SYNC, 0)
-	if err != nil {
-		return err
-	}
-	defer file.Close()
-	// "2" just frees the reclaimable inodes and dentries, the associated
-	// pages to these inodes will be freed. We do not need to free the
-	// entire pagecache (as this will severly impact performance).
-	_, err = file.WriteString("2")
-	return err
-}