services/service_manager/sandbox/linux/bpf_gpu_policy_linux.cc

// 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 "services/service_manager/sandbox/linux/bpf_gpu_policy_linux.h"

#include <errno.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>

#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/macros.h"
#include "build/build_config.h"
#include "sandbox/linux/bpf_dsl/bpf_dsl.h"
#include "sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h"
#include "sandbox/linux/seccomp-bpf-helpers/syscall_sets.h"
#include "sandbox/linux/syscall_broker/broker_process.h"
#include "sandbox/linux/system_headers/linux_syscalls.h"
#include "services/service_manager/sandbox/linux/bpf_base_policy_linux.h"
#include "services/service_manager/sandbox/linux/sandbox_linux.h"
#include "services/service_manager/sandbox/linux/sandbox_seccomp_bpf_linux.h"

using sandbox::bpf_dsl::Allow;
using sandbox::bpf_dsl::ResultExpr;
using sandbox::bpf_dsl::Trap;
using sandbox::syscall_broker::BrokerProcess;
using sandbox::SyscallSets;

namespace service_manager {

GpuProcessPolicy::GpuProcessPolicy() {}

GpuProcessPolicy::~GpuProcessPolicy() {}

// Main policy for x86_64/i386. Extended by CrosArmGpuProcessPolicy.
ResultExpr GpuProcessPolicy::EvaluateSyscall(int sysno) const {
  switch (sysno) {
#if !defined(OS_CHROMEOS)
    case __NR_ftruncate:
    case __NR_fallocate:
#endif
    case __NR_ioctl:
      return Allow();
#if defined(__i386__) || defined(__x86_64__) || defined(__mips__)
    // The Nvidia driver uses flags not in the baseline policy
    // (MAP_LOCKED | MAP_EXECUTABLE | MAP_32BIT)
    case __NR_mmap:
#endif
    // We also hit this on the linux_chromeos bot but don't yet know what
    // weird flags were involved.
    case __NR_mprotect:
    // TODO(jln): restrict prctl.
    case __NR_prctl:
    case __NR_sysinfo:
      return Allow();
    case __NR_sched_getaffinity:
    case __NR_sched_setaffinity:
      return sandbox::RestrictSchedTarget(GetPolicyPid(), sysno);
    case __NR_prlimit64:
      return sandbox::RestrictPrlimit64(GetPolicyPid());
    default:
      if (SyscallSets::IsEventFd(sysno))
        return Allow();

      auto* broker_process = SandboxLinux::GetInstance()->broker_process();
      if (broker_process->IsSyscallAllowed(sysno)) {
        return Trap(BrokerProcess::SIGSYS_Handler, broker_process);
      }

      // Default on the baseline policy.
      return BPFBasePolicy::EvaluateSyscall(sysno);
  }
}

}  // namespace service_manager