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// Copyright 2015 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 "sandbox/linux/services/namespace_utils.h"
#include <errno.h>
#include <sched.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "base/logging.h"
#include "base/posix/eintr_wrapper.h"
#include "base/process/launch.h"
#include "sandbox/linux/services/credentials.h"
#include "sandbox/linux/tests/unit_tests.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace sandbox {
namespace {
SANDBOX_TEST(NamespaceUtils, KernelSupportsUnprivilegedNamespace) {
const bool can_create_user_ns = Credentials::CanCreateProcessInNewUserNS();
const bool supports_user_ns =
NamespaceUtils::KernelSupportsUnprivilegedNamespace(CLONE_NEWUSER);
// can_create_user_ns implies supports_user_ns, but the converse is not
// necessarily true, as creating a user namespace can fail for various
// reasons.
if (can_create_user_ns) {
SANDBOX_ASSERT(supports_user_ns);
}
}
SANDBOX_TEST(NamespaceUtils, WriteToIdMapFile) {
if (!Credentials::CanCreateProcessInNewUserNS()) {
return;
}
const uid_t uid = getuid();
const gid_t gid = getgid();
const bool supports_deny_setgroups =
NamespaceUtils::KernelSupportsDenySetgroups();
const pid_t pid =
base::ForkWithFlags(CLONE_NEWUSER | SIGCHLD, nullptr, nullptr);
ASSERT_NE(-1, pid);
if (pid == 0) {
if (supports_deny_setgroups) {
RAW_CHECK(NamespaceUtils::DenySetgroups());
}
RAW_CHECK(getuid() != uid);
RAW_CHECK(NamespaceUtils::WriteToIdMapFile("/proc/self/uid_map", uid));
RAW_CHECK(getuid() == uid);
RAW_CHECK(getgid() != gid);
RAW_CHECK(NamespaceUtils::WriteToIdMapFile("/proc/self/gid_map", gid));
RAW_CHECK(getgid() == gid);
_exit(0);
}
int status = 42;
SANDBOX_ASSERT_EQ(pid, HANDLE_EINTR(waitpid(pid, &status, 0)));
SANDBOX_ASSERT_EQ(0, status);
}
} // namespace.
} // namespace sandbox.
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