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platform_bionic/tests/fdtrack_test.cpp
Treehugger Robot e3bc50d44f Merge changes If42905f3,Id351a993,I8a082fd0 
* changes:
  fdtrack: don't do anything while vforked.
  fdsan: don't do anything when vforked.
  Track whether a thread is currently vforked.
2020-05-12 07:04:58 +00:00

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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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 <gtest/gtest.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include <sys/types.h>
#include <unistd.h>
#if defined(__BIONIC__)
#include "platform/bionic/fdtrack.h"
#include "platform/bionic/reserved_signals.h"
#endif
#include <vector>
#include <android-base/cmsg.h>
#include <android-base/logging.h>
#include <android-base/unique_fd.h>
using android::base::ReceiveFileDescriptors;
using android::base::SendFileDescriptors;
using android::base::unique_fd;
#if defined(__BIONIC__)
void DumpEvent(std::vector<android_fdtrack_event>* events, size_t index) {
auto& event = (*events)[index];
if (event.type == ANDROID_FDTRACK_EVENT_TYPE_CREATE) {
fprintf(stderr, " event %zu: fd %d created by %s\n", index, event.fd,
event.data.create.function_name);
} else if (event.type == ANDROID_FDTRACK_EVENT_TYPE_CLOSE) {
fprintf(stderr, " event %zu: fd %d closed\n", index, event.fd);
} else {
errx(1, "unexpected fdtrack event type: %d", event.type);
}
}
std::vector<android_fdtrack_event> FdtrackRun(void (*func)()) {
// Each bionic test is run in separate process, so we can safely use a static here.
static std::vector<android_fdtrack_event> events;
events.clear();
android_fdtrack_hook_t previous = nullptr;
android_fdtrack_hook_t hook = [](android_fdtrack_event* event) {
raise(BIONIC_SIGNAL_DEBUGGER);
events.push_back(*event);
};
if (!android_fdtrack_compare_exchange_hook(&previous, hook)) {
errx(1, "failed to exchange hook: previous hook was %p", previous);
}
if (previous) {
errx(1, "hook was already registered?");
abort();
}
func();
if (!android_fdtrack_compare_exchange_hook(&hook, nullptr)) {
errx(1, "failed to reset hook");
}
// Filter out temporary fds created and closed as a result of the call.
// (e.g. accept creating a socket to tell netd about the newly accepted socket)
size_t i = 0;
while (i + 1 < events.size()) {
auto& event = events[i];
if (event.type == ANDROID_FDTRACK_EVENT_TYPE_CREATE) {
for (size_t j = i + 1; j < events.size(); ++j) {
if (event.fd == events[j].fd) {
if (events[j].type == ANDROID_FDTRACK_EVENT_TYPE_CREATE) {
fprintf(stderr, "error: multiple create events for the same fd:\n");
DumpEvent(&events, i);
DumpEvent(&events, j);
exit(1);
}
events.erase(events.begin() + j);
events.erase(events.begin() + i);
continue;
}
}
}
++i;
}
return std::move(events);
}
const char* FdtrackEventTypeToName(android_fdtrack_event_type event_type) {
switch (event_type) {
case ANDROID_FDTRACK_EVENT_TYPE_CREATE:
return "created";
case ANDROID_FDTRACK_EVENT_TYPE_CLOSE:
return "closed";
}
}
#endif
TEST(fdtrack, close) {
#if defined(__BIONIC__)
static int fd = open("/dev/null", O_WRONLY | O_CLOEXEC);
ASSERT_NE(-1, fd);
auto events = FdtrackRun([]() { close(fd); });
ASSERT_EQ(1U, events.size());
ASSERT_EQ(fd, events[0].fd);
ASSERT_EQ(ANDROID_FDTRACK_EVENT_TYPE_CLOSE, events[0].type);
#endif
}
TEST(fdtrack, enable_disable) {
#if defined(__BIONIC__)
static int fd1 = -1;
static int fd2 = -1;
static int fd3 = -1;
auto events = FdtrackRun([]() {
if (!android_fdtrack_get_enabled()) {
errx(1, "fdtrack is disabled");
}
fd1 = open("/dev/null", O_WRONLY | O_CLOEXEC);
android_fdtrack_set_enabled(false);
fd2 = open("/dev/null", O_WRONLY | O_CLOEXEC);
android_fdtrack_set_enabled(true);
fd3 = open("/dev/null", O_WRONLY | O_CLOEXEC);
});
if (fd1 == -1 || fd2 == -1 || fd3 == -1) {
errx(1, "failed to open /dev/null");
}
ASSERT_EQ(2U, events.size());
ASSERT_EQ(fd1, events[0].fd);
ASSERT_EQ(ANDROID_FDTRACK_EVENT_TYPE_CREATE, events[0].type);
ASSERT_STREQ("open", events[0].data.create.function_name);
ASSERT_EQ(fd3, events[1].fd);
ASSERT_EQ(ANDROID_FDTRACK_EVENT_TYPE_CREATE, events[1].type);
ASSERT_STREQ("open", events[1].data.create.function_name);
#endif
}
struct require_semicolon;
#if defined(__BIONIC__)
void SetFdResult(std::vector<int>* output, int fd) {
output->push_back(fd);
}
void SetFdResult(std::vector<int>* output, std::vector<int> fds) {
*output = fds;
}
#define FDTRACK_TEST_NAME(test_name, fdtrack_name, expression) \
TEST(fdtrack, test_name) { \
static std::vector<int> expected_fds; \
auto events = FdtrackRun([]() { SetFdResult(&expected_fds, expression); }); \
for (auto& fd : expected_fds) { \
ASSERT_NE(-1, fd); \
} \
if (events.size() != expected_fds.size()) { \
fprintf(stderr, "too many events received: expected %zu, got %zu:\n", expected_fds.size(), \
events.size()); \
for (size_t i = 0; i < events.size(); ++i) { \
DumpEvent(&events, i); \
} \
FAIL(); \
return; \
} \
for (auto& event : events) { \
ASSERT_NE(expected_fds.end(), \
std::find(expected_fds.begin(), expected_fds.end(), events[0].fd)); \
ASSERT_EQ(ANDROID_FDTRACK_EVENT_TYPE_CREATE, event.type); \
ASSERT_STREQ(fdtrack_name, event.data.create.function_name); \
} \
} \
struct require_semicolon
#else
#define FDTRACK_TEST_NAME(name, fdtrack_name, expression) \
TEST(fdtrack, name) {} \
struct require_semicolon
#endif
#define FDTRACK_TEST(name, expression) FDTRACK_TEST_NAME(name, #name, expression)
// clang-format misformats statement expressions pretty badly here:
// clang-format off
FDTRACK_TEST(open, open("/dev/null", O_WRONLY | O_CLOEXEC));
FDTRACK_TEST(openat, openat(AT_EMPTY_PATH, "/dev/null", O_WRONLY | O_CLOEXEC));
FDTRACK_TEST(socket, socket(AF_UNIX, SOCK_STREAM, 0));
FDTRACK_TEST(dup, dup(STDOUT_FILENO));
FDTRACK_TEST(dup2, dup2(STDOUT_FILENO, STDERR_FILENO));
FDTRACK_TEST(dup3, dup3(STDOUT_FILENO, STDERR_FILENO, 0));
FDTRACK_TEST_NAME(fcntl_F_DUPFD, "F_DUPFD", fcntl(STDOUT_FILENO, F_DUPFD, 0));
FDTRACK_TEST_NAME(fcntl_F_DUPFD_CLOEXEC, "F_DUPFD_CLOEXEC", fcntl(STDOUT_FILENO, F_DUPFD_CLOEXEC, 0));
FDTRACK_TEST(pipe, ({
std::vector<int> fds = { -1, -1};
if (pipe(fds.data()) != 0) {
err(1, "pipe failed");
}
fds;
}));
FDTRACK_TEST(pipe2, ({
std::vector<int> fds = { -1, -1};
if (pipe2(fds.data(), O_CLOEXEC) != 0) {
err(1, "pipe failed");
}
fds;
}));
FDTRACK_TEST(socketpair, ({
std::vector<int> fds = { -1, -1};
if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, fds.data()) != 0) {
err(1, "socketpair failed");
}
fds;
}));
FDTRACK_TEST(epoll_create, epoll_create(1));
FDTRACK_TEST(epoll_create1, epoll_create1(0));
FDTRACK_TEST(eventfd, eventfd(0, 0));
#if defined(__BIONIC__)
static int CreateListener() {
android_fdtrack_set_enabled(false);
int listener = socket(AF_INET, SOCK_STREAM, 0);
CHECK_NE(-1, listener);
sockaddr_in addr = {
.sin_family = AF_INET,
.sin_port = 0,
.sin_addr = {htonl(INADDR_LOOPBACK)},
};
socklen_t addrlen = sizeof(addr);
CHECK_NE(-1, bind(listener, reinterpret_cast<sockaddr*>(&addr), addrlen)) << strerror(errno);
CHECK_NE(-1, getsockname(listener, reinterpret_cast<sockaddr*>(&addr), &addrlen));
CHECK_EQ(static_cast<size_t>(addrlen), sizeof(addr));
CHECK_NE(-1, listen(listener, 1));
int connector = socket(AF_INET, SOCK_STREAM, 0);
CHECK_NE(-1, connector);
CHECK_NE(-1, connect(connector, reinterpret_cast<sockaddr*>(&addr), addrlen));
android_fdtrack_set_enabled(true);
return listener;
}
#endif
FDTRACK_TEST_NAME(accept, "accept4", accept(CreateListener(), nullptr, nullptr));
FDTRACK_TEST(accept4, accept4(CreateListener(), nullptr, nullptr, 0));
FDTRACK_TEST(recvmsg, ({
android_fdtrack_set_enabled(false);
int sockets[2];
ASSERT_NE(-1, socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sockets));
ASSERT_EQ(3, SendFileDescriptors(sockets[0], "foo", 3, STDIN_FILENO));
android_fdtrack_set_enabled(true);
char buf[4];
unique_fd received_fd;
ASSERT_EQ(3, ReceiveFileDescriptors(sockets[1], buf, sizeof(buf), &received_fd));
received_fd.release();
}));
FDTRACK_TEST_NAME(vfork, "open", ({
int fd = open("/dev/null", O_RDONLY);
pid_t rc = vfork();
ASSERT_NE(-1, rc);
if (rc == 0) {
close(fd);
_exit(0);
}
int status;
pid_t wait_result = waitpid(rc, &status, 0);
ASSERT_EQ(wait_result, rc);
ASSERT_TRUE(WIFEXITED(status));
ASSERT_EQ(0, WEXITSTATUS(status));
fd;
}));
// clang-format on
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