blob: fa40e72a0f9dbd0fea0737416364f62beac15acb [file] [log] [blame]
// Copyright (c) 2013 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 <sys/types.h>
#include "base/macros.h"
#include "sandbox/linux/bpf_dsl/bpf_dsl_forward.h"
#include "sandbox/linux/bpf_dsl/policy.h"
#include "sandbox/sandbox_export.h"
namespace sandbox {
// This is a helper to build seccomp-bpf policies, i.e. policies for a sandbox
// that reduces the Linux kernel's attack surface. Given its nature, it doesn't
// have a clear semantics and is mostly "implementation-defined".
// This class implements the Policy interface with a "baseline"
// policy for use within Chromium.
// The "baseline" policy is somewhat arbitrary. All Chromium policies are an
// alteration of it, and it represents a reasonable common ground to run most
// code in a sandboxed environment.
// A baseline policy is only valid for the process for which this object was
// instantiated (so do not fork() and use it in a child).
class SANDBOX_EXPORT BaselinePolicy : public bpf_dsl::Policy {
// |fs_denied_errno| is the errno returned when a filesystem access system
// call is denied.
explicit BaselinePolicy(int fs_denied_errno);
~BaselinePolicy() override;
bpf_dsl::ResultExpr EvaluateSyscall(int system_call_number) const override;
bpf_dsl::ResultExpr InvalidSyscall() const override;
pid_t policy_pid() const { return policy_pid_; }
int fs_denied_errno_;
// The PID that the policy applies to (should be equal to the current pid).
pid_t policy_pid_;
} // namespace sandbox.