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// Copyright (c) 2012 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/renderer/renderer_main_platform_delegate.h"
#include <errno.h>
#include <sys/stat.h>
#include "base/command_line.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "content/common/sandbox_linux/sandbox_linux.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/sandbox_init.h"
namespace content {
RendererMainPlatformDelegate::RendererMainPlatformDelegate(
const MainFunctionParams& parameters) {}
RendererMainPlatformDelegate::~RendererMainPlatformDelegate() {
}
void RendererMainPlatformDelegate::PlatformInitialize() {
}
void RendererMainPlatformDelegate::PlatformUninitialize() {
}
bool RendererMainPlatformDelegate::EnableSandbox() {
// The setuid sandbox is started in the zygote process: zygote_main_linux.cc
// https://chromium.googlesource.com/chromium/src/+/master/docs/linux_suid_sandbox.md
//
// Anything else is started in InitializeSandbox().
LinuxSandbox::InitializeSandbox();
// about:sandbox uses a value returned from LinuxSandbox::GetStatus() before
// any renderer has been started.
// Here, we test that the status of SeccompBpf in the renderer is consistent
// with what LinuxSandbox::GetStatus() said we would do.
class LinuxSandbox* linux_sandbox = LinuxSandbox::GetInstance();
if (linux_sandbox->GetStatus() & kSandboxLinuxSeccompBPF) {
CHECK(linux_sandbox->seccomp_bpf_started());
}
// Under the setuid sandbox, we should not be able to open any file via the
// filesystem.
if (linux_sandbox->GetStatus() & kSandboxLinuxSUID) {
CHECK(!base::PathExists(base::FilePath("/proc/cpuinfo")));
}
#if defined(__x86_64__)
// Limit this test to architectures where seccomp BPF is active in renderers.
if (linux_sandbox->seccomp_bpf_started()) {
errno = 0;
// This should normally return EBADF since the first argument is bogus,
// but we know that under the seccomp-bpf sandbox, this should return EPERM.
CHECK_EQ(fchmod(-1, 07777), -1);
CHECK_EQ(errno, EPERM);
}
#endif // __x86_64__
return true;
}
} // namespace content
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