b0c4881ea9
In the short term this will be used to help implement support for multiple kernel module directories but it may be useful in other contexts as well. Bug: 157645635 Change-Id: I15a252b6e9394292c8f3557ed65112c935830441
101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
/*
|
|
* Copyright (C) 2018 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 <sys/stat.h>
|
|
#include <sys/syscall.h>
|
|
|
|
#include <android-base/file.h>
|
|
#include <android-base/logging.h>
|
|
#include <android-base/unique_fd.h>
|
|
|
|
#include <modprobe/modprobe.h>
|
|
|
|
std::string Modprobe::GetKernelCmdline(void) {
|
|
std::string cmdline;
|
|
if (!android::base::ReadFileToString("/proc/cmdline", &cmdline)) {
|
|
return "";
|
|
}
|
|
return cmdline;
|
|
}
|
|
|
|
bool Modprobe::Insmod(const std::string& path_name, const std::string& parameters) {
|
|
android::base::unique_fd fd(
|
|
TEMP_FAILURE_RETRY(open(path_name.c_str(), O_RDONLY | O_NOFOLLOW | O_CLOEXEC)));
|
|
if (fd == -1) {
|
|
LOG(ERROR) << "Could not open module '" << path_name << "'";
|
|
return false;
|
|
}
|
|
|
|
auto canonical_name = MakeCanonical(path_name);
|
|
std::string options = "";
|
|
auto options_iter = module_options_.find(canonical_name);
|
|
if (options_iter != module_options_.end()) {
|
|
options = options_iter->second;
|
|
}
|
|
if (!parameters.empty()) {
|
|
options = options + " " + parameters;
|
|
}
|
|
|
|
LOG(INFO) << "Loading module " << path_name << " with args \"" << options << "\"";
|
|
int ret = syscall(__NR_finit_module, fd.get(), options.c_str(), 0);
|
|
if (ret != 0) {
|
|
if (errno == EEXIST) {
|
|
// Module already loaded
|
|
module_loaded_.emplace(canonical_name);
|
|
return true;
|
|
}
|
|
LOG(ERROR) << "Failed to insmod '" << path_name << "' with args '" << options << "'";
|
|
return false;
|
|
}
|
|
|
|
LOG(INFO) << "Loaded kernel module " << path_name;
|
|
module_loaded_.emplace(canonical_name);
|
|
module_count_++;
|
|
return true;
|
|
}
|
|
|
|
bool Modprobe::Rmmod(const std::string& module_name) {
|
|
auto canonical_name = MakeCanonical(module_name);
|
|
int ret = syscall(__NR_delete_module, canonical_name.c_str(), O_NONBLOCK);
|
|
if (ret != 0) {
|
|
PLOG(ERROR) << "Failed to remove module '" << module_name << "'";
|
|
return false;
|
|
}
|
|
module_loaded_.erase(canonical_name);
|
|
return true;
|
|
}
|
|
|
|
bool Modprobe::ModuleExists(const std::string& module_name) {
|
|
struct stat fileStat;
|
|
if (blacklist_enabled && module_blacklist_.count(module_name)) {
|
|
LOG(INFO) << "module " << module_name << " is blacklisted";
|
|
return false;
|
|
}
|
|
auto deps = GetDependencies(module_name);
|
|
if (deps.empty()) {
|
|
// missing deps can happen in the case of an alias
|
|
return false;
|
|
}
|
|
if (stat(deps.front().c_str(), &fileStat)) {
|
|
LOG(INFO) << "module " << module_name << " does not exist";
|
|
return false;
|
|
}
|
|
if (!S_ISREG(fileStat.st_mode)) {
|
|
LOG(INFO) << "module " << module_name << " is not a regular file";
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|