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- // 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.
- #ifndef SANDBOX_LINUX_SECCOMP_BPF_HELPERS_BASELINE_POLICY_H_
- #define SANDBOX_LINUX_SECCOMP_BPF_HELPERS_BASELINE_POLICY_H_
- #include <sys/types.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 {
- public:
- BaselinePolicy();
- // |fs_denied_errno| is the errno returned when a filesystem access system
- // call is denied.
- explicit BaselinePolicy(int fs_denied_errno);
- BaselinePolicy(const BaselinePolicy&) = delete;
- BaselinePolicy& operator=(const BaselinePolicy&) = delete;
- ~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_; }
- private:
- int fs_denied_errno_;
- // The PID that the policy applies to (should be equal to the current pid).
- pid_t policy_pid_;
- };
- } // namespace sandbox.
- #endif // SANDBOX_LINUX_SECCOMP_BPF_HELPERS_BASELINE_POLICY_H_
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