// Copyright 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 "content/common/sandbox_linux/bpf_renderer_policy_linux.h"

#include <errno.h>

#include "base/basictypes.h"
#include "build/build_config.h"
#include "content/common/sandbox_linux/sandbox_linux.h"
#include "sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h"
#include "sandbox/linux/seccomp-bpf-helpers/syscall_sets.h"
#include "sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h"
#include "sandbox/linux/services/linux_syscalls.h"

using sandbox::SyscallSets;

namespace content {

namespace {

inline bool IsUsingToolKitGtk() {
#if defined(TOOLKIT_GTK)
  return true;
#else
  return false;
#endif
}

}  // namespace

RendererProcessPolicy::RendererProcessPolicy() {}
RendererProcessPolicy::~RendererProcessPolicy() {}

ErrorCode RendererProcessPolicy::EvaluateSyscall(SandboxBPF* sandbox,
                                                 int sysno) const {
  switch (sysno) {
    case __NR_clone:
      return sandbox::RestrictCloneToThreadsAndEPERMFork(sandbox);
    case __NR_ioctl:
      return sandbox::RestrictIoctl(sandbox);
    case __NR_prctl:
      return sandbox::RestrictPrctl(sandbox);
    // Allow the system calls below.
    case __NR_fdatasync:
    case __NR_fsync:
    case __NR_getpriority:
#if defined(__i386__) || defined(__x86_64__)
    case __NR_getrlimit:
#endif
#if defined(__i386__) || defined(__arm__)
    case __NR_ugetrlimit:
#endif
    case __NR_mremap:  // See crbug.com/149834.
    case __NR_pread64:
    case __NR_pwrite64:
    case __NR_sched_getaffinity:
    case __NR_sched_get_priority_max:
    case __NR_sched_get_priority_min:
    case __NR_sched_getparam:
    case __NR_sched_getscheduler:
    case __NR_sched_setscheduler:
    case __NR_setpriority:
    case __NR_sysinfo:
    case __NR_times:
    case __NR_uname:
      return ErrorCode(ErrorCode::ERR_ALLOWED);
    case __NR_prlimit64:
      return ErrorCode(EPERM);  // See crbug.com/160157.
    default:
      if (IsUsingToolKitGtk()) {
#if defined(__x86_64__) || defined(__arm__)
        if (SyscallSets::IsSystemVSharedMemory(sysno))
          return ErrorCode(ErrorCode::ERR_ALLOWED);
#endif
#if defined(__i386__)
        if (SyscallSets::IsSystemVIpc(sysno))
          return ErrorCode(ErrorCode::ERR_ALLOWED);
#endif
      }

      // Default on the content baseline policy.
      return SandboxBPFBasePolicy::EvaluateSyscall(sandbox, sysno);
  }
}

}  // namespace content