sandboxed-api/sandboxed_api/sandbox2/buffer_test.cc

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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "sandboxed_api/sandbox2/buffer.h"
#include <sys/stat.h>
#include <syscall.h>
#include <unistd.h>
#include <cerrno>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include <glog/logging.h>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/memory/memory.h"
#include "sandboxed_api/sandbox2/comms.h"
#include "sandboxed_api/sandbox2/executor.h"
#include "sandboxed_api/sandbox2/ipc.h"
#include "sandboxed_api/sandbox2/policy.h"
#include "sandboxed_api/sandbox2/policybuilder.h"
#include "sandboxed_api/sandbox2/result.h"
#include "sandboxed_api/sandbox2/sandbox2.h"
#include "sandboxed_api/sandbox2/testing.h"
#include "sandboxed_api/util/status_matchers.h"
using ::testing::Eq;
using ::testing::IsTrue;
using ::testing::Ne;
namespace sandbox2 {
namespace {
// Test all public methods of sandbox2::Buffer.
TEST(BufferTest, TestImplementation) {
constexpr int kSize = 1024;
SAPI_ASSERT_OK_AND_ASSIGN(auto buffer, Buffer::CreateWithSize(kSize));
EXPECT_THAT(buffer->size(), Eq(kSize));
uint8_t* raw_buf = buffer->data();
for (int i = 0; i < kSize; i++) {
raw_buf[i] = 'X';
}
SAPI_ASSERT_OK_AND_ASSIGN(auto buffer2, Buffer::CreateFromFd(buffer->fd()));
uint8_t* raw_buf2 = buffer2->data();
for (int i = 0; i < kSize; i++) {
EXPECT_THAT(raw_buf2[i], Eq('X'));
}
}
std::unique_ptr<Policy> BufferTestcasePolicy() {
auto s2p = PolicyBuilder()
.DisableNamespaces()
.AllowStaticStartup()
.AllowExit()
.AllowSafeFcntl()
.AllowTime()
.AllowSyscall(__NR_dup)
.AllowSyscall(__NR_futex)
.AllowSyscall(__NR_getpid)
.AllowSyscall(__NR_gettid)
.AllowSystemMalloc()
.AllowRead()
.AllowWrite()
.AllowSyscall(__NR_nanosleep)
.AllowSyscall(__NR_rt_sigprocmask)
.AllowSyscall(__NR_recvmsg)
.AllowMmap()
.AllowStat()
.AllowSyscall(__NR_lseek)
.AllowSyscall(__NR_close)
.BlockSyscallWithErrno(__NR_prlimit64, EPERM)
.BlockSyscallWithErrno(__NR_open, ENOENT)
.BlockSyscallWithErrno(__NR_openat, ENOENT)
// On Debian, even static binaries check existence of
// /etc/ld.so.nohwcap.
.BlockSyscallWithErrno(__NR_access, ENOENT)
.BuildOrDie();
#if defined(__powerpc64__)
s2p->AllowUnsafeMmapFiles();
s2p->AllowUnsafeMmapShared();
#endif /* defined(__powerpc64__) */
return s2p;
}
// Test sharing of buffer between executor/sandboxee using dup/MapFd.
TEST(BufferTest, TestWithSandboxeeMapFd) {
SKIP_SANITIZERS_AND_COVERAGE;
const std::string path = GetTestSourcePath("sandbox2/testcases/buffer");
std::vector<std::string> args = {path, "1"};
auto executor = absl::make_unique<Executor>(path, args);
auto policy = BufferTestcasePolicy();
SAPI_ASSERT_OK_AND_ASSIGN(auto buffer,
Buffer::CreateWithSize(1ULL << 20 /* 1MiB */));
// buffer() uses the internal fd to mmap the buffer.
uint8_t* buf = buffer->data();
// Test that we can write data to the sandboxee.
buf[0] = 'A';
// Map buffer as fd 3, but careful because MapFd closes the buffer fd and
// we need to keep it since buffer uses it for mmap, so we must dup.
executor->ipc()->MapFd(dup(buffer->fd()), 3);
Sandbox2 s2(std::move(executor), std::move(policy));
auto result = s2.Run();
EXPECT_THAT(result.final_status(), Eq(Result::OK));
EXPECT_THAT(result.reason_code(), Eq(0));
// Test that we can read data from the sandboxee.
EXPECT_THAT(buf[buffer->size() - 1], Eq('B'));
// Test that internal buffer fd remains valid.
struct stat stat_buf;
EXPECT_THAT(fstat(buffer->fd(), &stat_buf), Ne(-1));
}
// Test sharing of buffer between executor/sandboxee using SendFD/RecvFD.
TEST(BufferTest, TestWithSandboxeeSendRecv) {
SKIP_SANITIZERS_AND_COVERAGE;
const std::string path = GetTestSourcePath("sandbox2/testcases/buffer");
std::vector<std::string> args = {path, "2"};
auto executor = absl::make_unique<Executor>(path, args);
auto* comms = executor->ipc()->comms();
auto policy = BufferTestcasePolicy();
Sandbox2 s2(std::move(executor), std::move(policy));
ASSERT_THAT(s2.RunAsync(), IsTrue());
SAPI_ASSERT_OK_AND_ASSIGN(auto buffer,
Buffer::CreateWithSize(1ULL << 20 /* 1MiB */));
uint8_t* buf = buffer->data();
// Test that we can write data to the sandboxee.
buf[0] = 'A';
EXPECT_THAT(comms->SendFD(buffer->fd()), IsTrue());
auto result = s2.AwaitResult();
EXPECT_THAT(result.final_status(), Eq(Result::OK));
EXPECT_THAT(result.reason_code(), Eq(0));
// Test that we can read data from the sandboxee.
EXPECT_THAT(buf[buffer->size() - 1], Eq('B'));
// Test that internal buffer fd remains valid.
struct stat stat_buf;
EXPECT_THAT(fstat(buffer->fd(), &stat_buf), Ne(-1));
}
} // namespace
} // namespace sandbox2