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Unified Diff: sandbox/linux/services/proc_util.h

Issue 761903003: Update from https://crrev.com/306655 (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 6 years ago
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Index: sandbox/linux/services/proc_util.h
diff --git a/sandbox/linux/services/proc_util.h b/sandbox/linux/services/proc_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..9d9bb2ea39936e021a324e994f302fcec283030e
--- /dev/null
+++ b/sandbox/linux/services/proc_util.h
@@ -0,0 +1,40 @@
+// Copyright 2014 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.
+
+#ifndef SANDBOX_LINUX_SERVICES_PROC_UTIL_H_
+#define SANDBOX_LINUX_SERVICES_PROC_UTIL_H_
+
+#include "base/macros.h"
+#include "sandbox/sandbox_export.h"
+
+namespace sandbox {
+
+class SANDBOX_EXPORT ProcUtil {
+ public:
+ // Returns the number of file descriptors in the current process's FD
+ // table, excluding |proc_fd|, which should be a file descriptor for
+ // /proc.
+ static int CountOpenFds(int proc_fd);
+
+ // Checks whether the current process has any directory file descriptor open.
+ // Directory file descriptors are "capabilities" that would let a process use
+ // system calls such as openat() to bypass restrictions such as
+ // DropFileSystemAccess().
+ // Sometimes it's useful to call HasOpenDirectory() after file system access
+ // has been dropped. In this case, |proc_fd| should be a file descriptor to
+ // /proc. The file descriptor in |proc_fd| will be ignored by
+ // HasOpenDirectory() and remains owned by the caller. It is very important
+ // for the caller to close it.
+ // If /proc is available, |proc_fd| can be passed as -1.
+ // If |proc_fd| is -1 and /proc is not available, this function will return
+ // false.
+ static bool HasOpenDirectory(int proc_fd);
+
+ private:
+ DISALLOW_IMPLICIT_CONSTRUCTORS(ProcUtil);
+};
+
+} // namespace sandbox
+
+#endif // SANDBOX_LINUX_SERVICES_PROC_UTIL_H_
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