42 lines
1.5 KiB
C++
42 lines
1.5 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef SANDBOX_LINUX_SERVICES_PROC_UTIL_H_
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#define SANDBOX_LINUX_SERVICES_PROC_UTIL_H_
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#include "base/files/scoped_file.h"
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#include "base/macros.h"
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#include "sandbox/sandbox_export.h"
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namespace sandbox {
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class SANDBOX_EXPORT ProcUtil {
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public:
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// Returns the number of file descriptors in the current process's FD
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// table, excluding |proc_fd|, which should be a file descriptor for
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// /proc/.
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static int CountOpenFds(int proc_fd);
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// Checks whether the current process has any directory file descriptor open.
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// Directory file descriptors are "capabilities" that would let a process use
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// system calls such as openat() to bypass restrictions such as
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// DropFileSystemAccess().
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// Sometimes it's useful to call HasOpenDirectory() after file system access
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// has been dropped. In this case, |proc_fd| should be a file descriptor to
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// /proc/. The file descriptor in |proc_fd| will be ignored by
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// HasOpenDirectory() and remains owned by the caller. It is very important
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// for the caller to close it.
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static bool HasOpenDirectory(int proc_fd) WARN_UNUSED_RESULT;
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static bool HasOpenDirectory() WARN_UNUSED_RESULT;
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// Open /proc/ or crash if not possible.
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static base::ScopedFD OpenProc();
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(ProcUtil);
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};
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} // namespace sandbox
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#endif // SANDBOX_LINUX_SERVICES_PROC_UTIL_H_
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