cecebbbacc
No functionality changes, this is a mechanical cleanup. Test: m Test: cd system/core && atest Change-Id: Ifdaa3ce1947ed578f656d5a446978726eb416c36
263 lines
9 KiB
C++
263 lines
9 KiB
C++
/*
|
|
* Copyright (C) 2017 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 "firmware_handler.h"
|
|
|
|
#include <fcntl.h>
|
|
#include <pwd.h>
|
|
#include <signal.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/sendfile.h>
|
|
#include <sys/wait.h>
|
|
#include <unistd.h>
|
|
|
|
#include <thread>
|
|
|
|
#include <android-base/chrono_utils.h>
|
|
#include <android-base/file.h>
|
|
#include <android-base/logging.h>
|
|
#include <android-base/strings.h>
|
|
#include <android-base/unique_fd.h>
|
|
|
|
using android::base::ReadFdToString;
|
|
using android::base::Socketpair;
|
|
using android::base::Split;
|
|
using android::base::Timer;
|
|
using android::base::Trim;
|
|
using android::base::unique_fd;
|
|
using android::base::WriteFully;
|
|
|
|
namespace android {
|
|
namespace init {
|
|
|
|
static void LoadFirmware(const std::string& firmware, const std::string& root, int fw_fd,
|
|
size_t fw_size, int loading_fd, int data_fd) {
|
|
// Start transfer.
|
|
WriteFully(loading_fd, "1", 1);
|
|
|
|
// Copy the firmware.
|
|
int rc = sendfile(data_fd, fw_fd, nullptr, fw_size);
|
|
if (rc == -1) {
|
|
PLOG(ERROR) << "firmware: sendfile failed { '" << root << "', '" << firmware << "' }";
|
|
}
|
|
|
|
// Tell the firmware whether to abort or commit.
|
|
const char* response = (rc != -1) ? "0" : "-1";
|
|
WriteFully(loading_fd, response, strlen(response));
|
|
}
|
|
|
|
static bool IsBooting() {
|
|
return access("/dev/.booting", F_OK) == 0;
|
|
}
|
|
|
|
FirmwareHandler::FirmwareHandler(std::vector<std::string> firmware_directories,
|
|
std::vector<ExternalFirmwareHandler> external_firmware_handlers)
|
|
: firmware_directories_(std::move(firmware_directories)),
|
|
external_firmware_handlers_(std::move(external_firmware_handlers)) {}
|
|
|
|
Result<std::string> FirmwareHandler::RunExternalHandler(const std::string& handler, uid_t uid,
|
|
const Uevent& uevent) const {
|
|
unique_fd child_stdout;
|
|
unique_fd parent_stdout;
|
|
if (!Socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, &child_stdout, &parent_stdout)) {
|
|
return ErrnoError() << "Socketpair() for stdout failed";
|
|
}
|
|
|
|
unique_fd child_stderr;
|
|
unique_fd parent_stderr;
|
|
if (!Socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, &child_stderr, &parent_stderr)) {
|
|
return ErrnoError() << "Socketpair() for stderr failed";
|
|
}
|
|
|
|
signal(SIGCHLD, SIG_DFL);
|
|
|
|
auto pid = fork();
|
|
if (pid < 0) {
|
|
return ErrnoError() << "fork() failed";
|
|
}
|
|
|
|
if (pid == 0) {
|
|
setenv("FIRMWARE", uevent.firmware.c_str(), 1);
|
|
setenv("DEVPATH", uevent.path.c_str(), 1);
|
|
parent_stdout.reset();
|
|
parent_stderr.reset();
|
|
close(STDOUT_FILENO);
|
|
close(STDERR_FILENO);
|
|
dup2(child_stdout.get(), STDOUT_FILENO);
|
|
dup2(child_stderr.get(), STDERR_FILENO);
|
|
|
|
auto args = Split(handler, " ");
|
|
std::vector<char*> c_args;
|
|
for (auto& arg : args) {
|
|
c_args.emplace_back(arg.data());
|
|
}
|
|
c_args.emplace_back(nullptr);
|
|
|
|
if (setuid(uid) != 0) {
|
|
fprintf(stderr, "setuid() failed: %s", strerror(errno));
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
execv(c_args[0], c_args.data());
|
|
fprintf(stderr, "exec() failed: %s", strerror(errno));
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
child_stdout.reset();
|
|
child_stderr.reset();
|
|
|
|
int status;
|
|
pid_t waited_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0));
|
|
if (waited_pid == -1) {
|
|
return ErrnoError() << "waitpid() failed";
|
|
}
|
|
|
|
std::string stdout_content;
|
|
if (!ReadFdToString(parent_stdout.get(), &stdout_content)) {
|
|
return ErrnoError() << "ReadFdToString() for stdout failed";
|
|
}
|
|
|
|
std::string stderr_content;
|
|
if (ReadFdToString(parent_stderr.get(), &stderr_content)) {
|
|
auto messages = Split(stderr_content, "\n");
|
|
for (const auto& message : messages) {
|
|
if (!message.empty()) {
|
|
LOG(ERROR) << "External Firmware Handler: " << message;
|
|
}
|
|
}
|
|
} else {
|
|
LOG(ERROR) << "ReadFdToString() for stderr failed";
|
|
}
|
|
|
|
if (WIFEXITED(status)) {
|
|
if (WEXITSTATUS(status) == EXIT_SUCCESS) {
|
|
return Trim(stdout_content);
|
|
} else {
|
|
return Error() << "exited with status " << WEXITSTATUS(status);
|
|
}
|
|
} else if (WIFSIGNALED(status)) {
|
|
return Error() << "killed by signal " << WTERMSIG(status);
|
|
}
|
|
|
|
return Error() << "unexpected exit status " << status;
|
|
}
|
|
|
|
std::string FirmwareHandler::GetFirmwarePath(const Uevent& uevent) const {
|
|
for (const auto& external_handler : external_firmware_handlers_) {
|
|
if (external_handler.devpath == uevent.path) {
|
|
LOG(INFO) << "Launching external firmware handler '" << external_handler.handler_path
|
|
<< "' for devpath: '" << uevent.path << "' firmware: '" << uevent.firmware
|
|
<< "'";
|
|
|
|
auto result =
|
|
RunExternalHandler(external_handler.handler_path, external_handler.uid, uevent);
|
|
if (!result.ok()) {
|
|
LOG(ERROR) << "Using default firmware; External firmware handler failed: "
|
|
<< result.error();
|
|
return uevent.firmware;
|
|
}
|
|
if (result->find("..") != std::string::npos) {
|
|
LOG(ERROR) << "Using default firmware; External firmware handler provided an "
|
|
"invalid path, '"
|
|
<< *result << "'";
|
|
return uevent.firmware;
|
|
}
|
|
LOG(INFO) << "Loading firmware '" << *result << "' in place of '" << uevent.firmware
|
|
<< "'";
|
|
return *result;
|
|
}
|
|
}
|
|
LOG(INFO) << "firmware: loading '" << uevent.firmware << "' for '" << uevent.path << "'";
|
|
return uevent.firmware;
|
|
}
|
|
|
|
void FirmwareHandler::ProcessFirmwareEvent(const std::string& root,
|
|
const std::string& firmware) const {
|
|
std::string loading = root + "/loading";
|
|
std::string data = root + "/data";
|
|
|
|
unique_fd loading_fd(open(loading.c_str(), O_WRONLY | O_CLOEXEC));
|
|
if (loading_fd == -1) {
|
|
PLOG(ERROR) << "couldn't open firmware loading fd for " << firmware;
|
|
return;
|
|
}
|
|
|
|
unique_fd data_fd(open(data.c_str(), O_WRONLY | O_CLOEXEC));
|
|
if (data_fd == -1) {
|
|
PLOG(ERROR) << "couldn't open firmware data fd for " << firmware;
|
|
return;
|
|
}
|
|
|
|
std::vector<std::string> attempted_paths_and_errors;
|
|
|
|
int booting = IsBooting();
|
|
try_loading_again:
|
|
attempted_paths_and_errors.clear();
|
|
for (const auto& firmware_directory : firmware_directories_) {
|
|
std::string file = firmware_directory + firmware;
|
|
unique_fd fw_fd(open(file.c_str(), O_RDONLY | O_CLOEXEC));
|
|
if (fw_fd == -1) {
|
|
attempted_paths_and_errors.emplace_back("firmware: attempted " + file +
|
|
", open failed: " + strerror(errno));
|
|
continue;
|
|
}
|
|
struct stat sb;
|
|
if (fstat(fw_fd, &sb) == -1) {
|
|
attempted_paths_and_errors.emplace_back("firmware: attempted " + file +
|
|
", fstat failed: " + strerror(errno));
|
|
continue;
|
|
}
|
|
LoadFirmware(firmware, root, fw_fd, sb.st_size, loading_fd, data_fd);
|
|
return;
|
|
}
|
|
|
|
if (booting) {
|
|
// If we're not fully booted, we may be missing
|
|
// filesystems needed for firmware, wait and retry.
|
|
std::this_thread::sleep_for(100ms);
|
|
booting = IsBooting();
|
|
goto try_loading_again;
|
|
}
|
|
|
|
LOG(ERROR) << "firmware: could not find firmware for " << firmware;
|
|
for (const auto& message : attempted_paths_and_errors) {
|
|
LOG(ERROR) << message;
|
|
}
|
|
|
|
// Write "-1" as our response to the kernel's firmware request, since we have nothing for it.
|
|
write(loading_fd, "-1", 2);
|
|
}
|
|
|
|
void FirmwareHandler::HandleUevent(const Uevent& uevent) {
|
|
if (uevent.subsystem != "firmware" || uevent.action != "add") return;
|
|
|
|
// Loading the firmware in a child means we can do that in parallel...
|
|
auto pid = fork();
|
|
if (pid == -1) {
|
|
PLOG(ERROR) << "could not fork to process firmware event for " << uevent.firmware;
|
|
}
|
|
if (pid == 0) {
|
|
Timer t;
|
|
auto firmware = GetFirmwarePath(uevent);
|
|
ProcessFirmwareEvent("/sys" + uevent.path, firmware);
|
|
LOG(INFO) << "loading " << uevent.path << " took " << t;
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
}
|
|
|
|
} // namespace init
|
|
} // namespace android
|