596 lines
22 KiB
C++
596 lines
22 KiB
C++
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "devices.h"
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#include <errno.h>
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#include <fnmatch.h>
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#include <sys/sysmacros.h>
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#include <unistd.h>
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#include <chrono>
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#include <filesystem>
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#include <memory>
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#include <string>
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#include <thread>
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#include <android-base/chrono_utils.h>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include <private/android_filesystem_config.h>
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#include <selinux/android.h>
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#include <selinux/selinux.h>
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#include "selabel.h"
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#include "util.h"
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using namespace std::chrono_literals;
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using android::base::Basename;
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using android::base::Dirname;
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using android::base::ReadFileToString;
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using android::base::Readlink;
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using android::base::Realpath;
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using android::base::Split;
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using android::base::StartsWith;
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using android::base::StringPrintf;
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using android::base::Trim;
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namespace android {
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namespace init {
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/* Given a path that may start with a PCI device, populate the supplied buffer
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* with the PCI domain/bus number and the peripheral ID and return 0.
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* If it doesn't start with a PCI device, or there is some error, return -1 */
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static bool FindPciDevicePrefix(const std::string& path, std::string* result) {
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result->clear();
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if (!StartsWith(path, "/devices/pci")) return false;
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/* Beginning of the prefix is the initial "pci" after "/devices/" */
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std::string::size_type start = 9;
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/* End of the prefix is two path '/' later, capturing the domain/bus number
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* and the peripheral ID. Example: pci0000:00/0000:00:1f.2 */
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auto end = path.find('/', start);
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if (end == std::string::npos) return false;
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end = path.find('/', end + 1);
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if (end == std::string::npos) return false;
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auto length = end - start;
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if (length <= 4) {
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// The minimum string that will get to this check is 'pci/', which is malformed,
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// so return false
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return false;
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}
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*result = path.substr(start, length);
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return true;
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}
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/* Given a path that may start with a virtual block device, populate
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* the supplied buffer with the virtual block device ID and return 0.
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* If it doesn't start with a virtual block device, or there is some
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* error, return -1 */
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static bool FindVbdDevicePrefix(const std::string& path, std::string* result) {
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result->clear();
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if (!StartsWith(path, "/devices/vbd-")) return false;
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/* Beginning of the prefix is the initial "vbd-" after "/devices/" */
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std::string::size_type start = 13;
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/* End of the prefix is one path '/' later, capturing the
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virtual block device ID. Example: 768 */
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auto end = path.find('/', start);
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if (end == std::string::npos) return false;
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auto length = end - start;
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if (length == 0) return false;
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*result = path.substr(start, length);
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return true;
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}
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// Given a path that may start with a virtual dm block device, populate
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// the supplied buffer with the dm module's instantiated name.
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// If it doesn't start with a virtual block device, or there is some
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// error, return false.
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static bool FindDmDevice(const std::string& path, std::string* name, std::string* uuid) {
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if (!StartsWith(path, "/devices/virtual/block/dm-")) return false;
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if (!ReadFileToString("/sys" + path + "/dm/name", name)) {
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return false;
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}
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ReadFileToString("/sys" + path + "/dm/uuid", uuid);
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*name = android::base::Trim(*name);
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*uuid = android::base::Trim(*uuid);
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return true;
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}
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Permissions::Permissions(const std::string& name, mode_t perm, uid_t uid, gid_t gid,
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bool no_fnm_pathname)
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: name_(name),
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perm_(perm),
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uid_(uid),
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gid_(gid),
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prefix_(false),
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wildcard_(false),
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no_fnm_pathname_(no_fnm_pathname) {
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// Set 'prefix_' or 'wildcard_' based on the below cases:
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//
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// 1) No '*' in 'name' -> Neither are set and Match() checks a given path for strict
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// equality with 'name'
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//
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// 2) '*' only appears as the last character in 'name' -> 'prefix'_ is set to true and
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// Match() checks if 'name' is a prefix of a given path.
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//
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// 3) '*' appears elsewhere -> 'wildcard_' is set to true and Match() uses fnmatch()
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// with FNM_PATHNAME to compare 'name' to a given path.
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auto wildcard_position = name_.find('*');
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if (wildcard_position != std::string::npos) {
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if (wildcard_position == name_.length() - 1) {
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prefix_ = true;
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name_.pop_back();
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} else {
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wildcard_ = true;
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}
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}
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}
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bool Permissions::Match(const std::string& path) const {
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if (prefix_) return StartsWith(path, name_);
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if (wildcard_)
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return fnmatch(name_.c_str(), path.c_str(), no_fnm_pathname_ ? 0 : FNM_PATHNAME) == 0;
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return path == name_;
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}
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bool SysfsPermissions::MatchWithSubsystem(const std::string& path,
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const std::string& subsystem) const {
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std::string path_basename = Basename(path);
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if (name().find(subsystem) != std::string::npos) {
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if (Match("/sys/class/" + subsystem + "/" + path_basename)) return true;
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if (Match("/sys/bus/" + subsystem + "/devices/" + path_basename)) return true;
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}
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return Match(path);
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}
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void SysfsPermissions::SetPermissions(const std::string& path) const {
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std::string attribute_file = path + "/" + attribute_;
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LOG(VERBOSE) << "fixup " << attribute_file << " " << uid() << " " << gid() << " " << std::oct
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<< perm();
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if (access(attribute_file.c_str(), F_OK) == 0) {
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if (chown(attribute_file.c_str(), uid(), gid()) != 0) {
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PLOG(ERROR) << "chown(" << attribute_file << ", " << uid() << ", " << gid()
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<< ") failed";
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}
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if (chmod(attribute_file.c_str(), perm()) != 0) {
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PLOG(ERROR) << "chmod(" << attribute_file << ", " << perm() << ") failed";
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}
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}
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}
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std::string DeviceHandler::GetPartitionNameForDevice(const std::string& query_device) {
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static const auto partition_map = [] {
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std::vector<std::pair<std::string, std::string>> partition_map;
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auto parser = [&partition_map](const std::string& key, const std::string& value) {
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if (key != "androidboot.partition_map") {
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return;
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}
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for (const auto& map : Split(value, ";")) {
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auto map_pieces = Split(map, ",");
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if (map_pieces.size() != 2) {
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LOG(ERROR) << "Expected a comma separated device,partition mapping, but found '"
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<< map << "'";
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continue;
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}
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partition_map.emplace_back(map_pieces[0], map_pieces[1]);
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}
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};
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ImportKernelCmdline(parser);
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ImportBootconfig(parser);
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return partition_map;
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}();
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for (const auto& [device, partition] : partition_map) {
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if (query_device == device) {
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return partition;
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}
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}
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return {};
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}
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// Given a path that may start with a platform device, find the parent platform device by finding a
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// parent directory with a 'subsystem' symlink that points to the platform bus.
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// If it doesn't start with a platform device, return false
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bool DeviceHandler::FindPlatformDevice(std::string path, std::string* platform_device_path) const {
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platform_device_path->clear();
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// Uevents don't contain the mount point, so we need to add it here.
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path.insert(0, sysfs_mount_point_);
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std::string directory = Dirname(path);
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while (directory != "/" && directory != ".") {
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std::string subsystem_link_path;
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if (Realpath(directory + "/subsystem", &subsystem_link_path) &&
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(subsystem_link_path == sysfs_mount_point_ + "/bus/platform" ||
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subsystem_link_path == sysfs_mount_point_ + "/bus/amba")) {
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// We need to remove the mount point that we added above before returning.
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directory.erase(0, sysfs_mount_point_.size());
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*platform_device_path = directory;
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return true;
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}
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auto last_slash = path.rfind('/');
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if (last_slash == std::string::npos) return false;
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path.erase(last_slash);
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directory = Dirname(path);
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}
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return false;
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}
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void DeviceHandler::FixupSysPermissions(const std::string& upath,
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const std::string& subsystem) const {
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// upaths omit the "/sys" that paths in this list
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// contain, so we prepend it...
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std::string path = "/sys" + upath;
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for (const auto& s : sysfs_permissions_) {
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if (s.MatchWithSubsystem(path, subsystem)) s.SetPermissions(path);
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}
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if (!skip_restorecon_ && access(path.c_str(), F_OK) == 0) {
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LOG(VERBOSE) << "restorecon_recursive: " << path;
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if (selinux_android_restorecon(path.c_str(), SELINUX_ANDROID_RESTORECON_RECURSE) != 0) {
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PLOG(ERROR) << "selinux_android_restorecon(" << path << ") failed";
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}
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}
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}
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std::tuple<mode_t, uid_t, gid_t> DeviceHandler::GetDevicePermissions(
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const std::string& path, const std::vector<std::string>& links) const {
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// Search the perms list in reverse so that ueventd.$hardware can override ueventd.rc.
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for (auto it = dev_permissions_.crbegin(); it != dev_permissions_.crend(); ++it) {
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if (it->Match(path) || std::any_of(links.cbegin(), links.cend(),
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[it](const auto& link) { return it->Match(link); })) {
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return {it->perm(), it->uid(), it->gid()};
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}
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}
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/* Default if nothing found. */
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return {0600, 0, 0};
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}
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void DeviceHandler::MakeDevice(const std::string& path, bool block, int major, int minor,
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const std::vector<std::string>& links) const {
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auto[mode, uid, gid] = GetDevicePermissions(path, links);
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mode |= (block ? S_IFBLK : S_IFCHR);
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std::string secontext;
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if (!SelabelLookupFileContextBestMatch(path, links, mode, &secontext)) {
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PLOG(ERROR) << "Device '" << path << "' not created; cannot find SELinux label";
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return;
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}
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if (!secontext.empty()) {
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setfscreatecon(secontext.c_str());
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}
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gid_t new_group = -1;
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dev_t dev = makedev(major, minor);
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/* Temporarily change egid to avoid race condition setting the gid of the
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* device node. Unforunately changing the euid would prevent creation of
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* some device nodes, so the uid has to be set with chown() and is still
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* racy. Fixing the gid race at least fixed the issue with system_server
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* opening dynamic input devices under the AID_INPUT gid. */
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if (setegid(gid)) {
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PLOG(ERROR) << "setegid(" << gid << ") for " << path << " device failed";
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goto out;
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}
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/* If the node already exists update its SELinux label and the file mode to handle cases when
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* it was created with the wrong context and file mode during coldboot procedure. */
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if (mknod(path.c_str(), mode, dev) && (errno == EEXIST) && !secontext.empty()) {
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char* fcon = nullptr;
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int rc = lgetfilecon(path.c_str(), &fcon);
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if (rc < 0) {
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PLOG(ERROR) << "Cannot get SELinux label on '" << path << "' device";
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goto out;
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}
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bool different = fcon != secontext;
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freecon(fcon);
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if (different && lsetfilecon(path.c_str(), secontext.c_str())) {
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PLOG(ERROR) << "Cannot set '" << secontext << "' SELinux label on '" << path
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<< "' device";
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}
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struct stat s;
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if (stat(path.c_str(), &s) == 0) {
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if (gid != s.st_gid) {
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new_group = gid;
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}
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if (mode != s.st_mode) {
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if (chmod(path.c_str(), mode) != 0) {
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PLOG(ERROR) << "Cannot chmod " << path << " to " << mode;
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}
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}
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} else {
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PLOG(ERROR) << "Cannot stat " << path;
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}
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}
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out:
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if (chown(path.c_str(), uid, new_group) < 0) {
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PLOG(ERROR) << "Cannot chown " << path << " " << uid << " " << new_group;
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}
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if (setegid(AID_ROOT)) {
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PLOG(FATAL) << "setegid(AID_ROOT) failed";
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}
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if (!secontext.empty()) {
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setfscreatecon(nullptr);
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}
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}
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// replaces any unacceptable characters with '_', the
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// length of the resulting string is equal to the input string
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void SanitizePartitionName(std::string* string) {
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const char* accept =
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"abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"0123456789"
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"_-.";
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if (!string) return;
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std::string::size_type pos = 0;
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while ((pos = string->find_first_not_of(accept, pos)) != std::string::npos) {
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(*string)[pos] = '_';
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}
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}
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std::vector<std::string> DeviceHandler::GetBlockDeviceSymlinks(const Uevent& uevent) const {
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std::string device;
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std::string type;
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std::string partition;
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std::string uuid;
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if (FindPlatformDevice(uevent.path, &device)) {
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// Skip /devices/platform or /devices/ if present
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static const std::string devices_platform_prefix = "/devices/platform/";
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static const std::string devices_prefix = "/devices/";
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if (StartsWith(device, devices_platform_prefix)) {
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device = device.substr(devices_platform_prefix.length());
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} else if (StartsWith(device, devices_prefix)) {
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device = device.substr(devices_prefix.length());
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}
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type = "platform";
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} else if (FindPciDevicePrefix(uevent.path, &device)) {
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type = "pci";
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} else if (FindVbdDevicePrefix(uevent.path, &device)) {
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type = "vbd";
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} else if (FindDmDevice(uevent.path, &partition, &uuid)) {
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std::vector<std::string> symlinks = {"/dev/block/mapper/" + partition};
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if (!uuid.empty()) {
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symlinks.emplace_back("/dev/block/mapper/by-uuid/" + uuid);
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}
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return symlinks;
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} else {
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return {};
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}
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std::vector<std::string> links;
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LOG(VERBOSE) << "found " << type << " device " << device;
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auto link_path = "/dev/block/" + type + "/" + device;
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bool is_boot_device = boot_devices_.find(device) != boot_devices_.end();
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if (!uevent.partition_name.empty()) {
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std::string partition_name_sanitized(uevent.partition_name);
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SanitizePartitionName(&partition_name_sanitized);
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if (partition_name_sanitized != uevent.partition_name) {
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LOG(VERBOSE) << "Linking partition '" << uevent.partition_name << "' as '"
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<< partition_name_sanitized << "'";
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}
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links.emplace_back(link_path + "/by-name/" + partition_name_sanitized);
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// Adds symlink: /dev/block/by-name/<partition_name>.
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if (is_boot_device) {
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links.emplace_back("/dev/block/by-name/" + partition_name_sanitized);
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}
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} else if (is_boot_device) {
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// If we don't have a partition name but we are a partition on a boot device, create a
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// symlink of /dev/block/by-name/<device_name> for symmetry.
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links.emplace_back("/dev/block/by-name/" + uevent.device_name);
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auto partition_name = GetPartitionNameForDevice(uevent.device_name);
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if (!partition_name.empty()) {
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links.emplace_back("/dev/block/by-name/" + partition_name);
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}
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}
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auto last_slash = uevent.path.rfind('/');
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links.emplace_back(link_path + "/" + uevent.path.substr(last_slash + 1));
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return links;
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}
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static void RemoveDeviceMapperLinks(const std::string& devpath) {
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std::vector<std::string> dirs = {
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"/dev/block/mapper",
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"/dev/block/mapper/by-uuid",
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};
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for (const auto& dir : dirs) {
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if (access(dir.c_str(), F_OK) != 0) continue;
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std::unique_ptr<DIR, decltype(&closedir)> dh(opendir(dir.c_str()), closedir);
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if (!dh) {
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PLOG(ERROR) << "Failed to open directory " << dir;
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continue;
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}
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struct dirent* dp;
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std::string link_path;
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while ((dp = readdir(dh.get())) != nullptr) {
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if (dp->d_type != DT_LNK) continue;
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auto path = dir + "/" + dp->d_name;
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if (Readlink(path, &link_path) && link_path == devpath) {
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unlink(path.c_str());
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}
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}
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}
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}
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void DeviceHandler::HandleDevice(const std::string& action, const std::string& devpath, bool block,
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int major, int minor, const std::vector<std::string>& links) const {
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if (action == "add") {
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MakeDevice(devpath, block, major, minor, links);
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}
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// We don't have full device-mapper information until a change event is fired.
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if (action == "add" || (action == "change" && StartsWith(devpath, "/dev/block/dm-"))) {
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for (const auto& link : links) {
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if (!mkdir_recursive(Dirname(link), 0755)) {
|
|
PLOG(ERROR) << "Failed to create directory " << Dirname(link);
|
|
}
|
|
|
|
if (symlink(devpath.c_str(), link.c_str())) {
|
|
if (errno != EEXIST) {
|
|
PLOG(ERROR) << "Failed to symlink " << devpath << " to " << link;
|
|
} else if (std::string link_path;
|
|
Readlink(link, &link_path) && link_path != devpath) {
|
|
PLOG(ERROR) << "Failed to symlink " << devpath << " to " << link
|
|
<< ", which already links to: " << link_path;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (action == "remove") {
|
|
if (StartsWith(devpath, "/dev/block/dm-")) {
|
|
RemoveDeviceMapperLinks(devpath);
|
|
}
|
|
for (const auto& link : links) {
|
|
std::string link_path;
|
|
if (Readlink(link, &link_path) && link_path == devpath) {
|
|
unlink(link.c_str());
|
|
}
|
|
}
|
|
unlink(devpath.c_str());
|
|
}
|
|
}
|
|
|
|
void DeviceHandler::HandleAshmemUevent(const Uevent& uevent) {
|
|
if (uevent.device_name == "ashmem") {
|
|
static const std::string boot_id_path = "/proc/sys/kernel/random/boot_id";
|
|
std::string boot_id;
|
|
if (!ReadFileToString(boot_id_path, &boot_id)) {
|
|
PLOG(ERROR) << "Cannot duplicate ashmem device node. Failed to read " << boot_id_path;
|
|
return;
|
|
};
|
|
boot_id = Trim(boot_id);
|
|
|
|
Uevent dup_ashmem_uevent = uevent;
|
|
dup_ashmem_uevent.device_name += boot_id;
|
|
dup_ashmem_uevent.path += boot_id;
|
|
HandleUevent(dup_ashmem_uevent);
|
|
}
|
|
}
|
|
|
|
void DeviceHandler::HandleUevent(const Uevent& uevent) {
|
|
if (uevent.action == "add" || uevent.action == "change" ||
|
|
uevent.action == "bind" || uevent.action == "online") {
|
|
FixupSysPermissions(uevent.path, uevent.subsystem);
|
|
}
|
|
|
|
// if it's not a /dev device, nothing to do
|
|
if (uevent.major < 0 || uevent.minor < 0) return;
|
|
|
|
std::string devpath;
|
|
std::vector<std::string> links;
|
|
bool block = false;
|
|
|
|
if (uevent.subsystem == "block") {
|
|
block = true;
|
|
devpath = "/dev/block/" + Basename(uevent.path);
|
|
|
|
if (StartsWith(uevent.path, "/devices")) {
|
|
links = GetBlockDeviceSymlinks(uevent);
|
|
}
|
|
} else if (const auto subsystem =
|
|
std::find(subsystems_.cbegin(), subsystems_.cend(), uevent.subsystem);
|
|
subsystem != subsystems_.cend()) {
|
|
devpath = subsystem->ParseDevPath(uevent);
|
|
} else if (uevent.subsystem == "usb") {
|
|
if (!uevent.device_name.empty()) {
|
|
devpath = "/dev/" + uevent.device_name;
|
|
} else {
|
|
// This imitates the file system that would be created
|
|
// if we were using devfs instead.
|
|
// Minors are broken up into groups of 128, starting at "001"
|
|
int bus_id = uevent.minor / 128 + 1;
|
|
int device_id = uevent.minor % 128 + 1;
|
|
devpath = StringPrintf("/dev/bus/usb/%03d/%03d", bus_id, device_id);
|
|
}
|
|
} else if (StartsWith(uevent.subsystem, "usb")) {
|
|
// ignore other USB events
|
|
return;
|
|
} else if (uevent.subsystem == "misc" && StartsWith(uevent.device_name, "dm-user/")) {
|
|
devpath = "/dev/dm-user/" + uevent.device_name.substr(8);
|
|
} else {
|
|
devpath = "/dev/" + Basename(uevent.path);
|
|
}
|
|
|
|
mkdir_recursive(Dirname(devpath), 0755);
|
|
|
|
HandleDevice(uevent.action, devpath, block, uevent.major, uevent.minor, links);
|
|
|
|
// Duplicate /dev/ashmem device and name it /dev/ashmem<boot_id>.
|
|
// TODO(b/111903542): remove once all users of /dev/ashmem are migrated to libcutils API.
|
|
HandleAshmemUevent(uevent);
|
|
}
|
|
|
|
void DeviceHandler::ColdbootDone() {
|
|
skip_restorecon_ = false;
|
|
}
|
|
|
|
DeviceHandler::DeviceHandler(std::vector<Permissions> dev_permissions,
|
|
std::vector<SysfsPermissions> sysfs_permissions,
|
|
std::vector<Subsystem> subsystems, std::set<std::string> boot_devices,
|
|
bool skip_restorecon)
|
|
: dev_permissions_(std::move(dev_permissions)),
|
|
sysfs_permissions_(std::move(sysfs_permissions)),
|
|
subsystems_(std::move(subsystems)),
|
|
boot_devices_(std::move(boot_devices)),
|
|
skip_restorecon_(skip_restorecon),
|
|
sysfs_mount_point_("/sys") {}
|
|
|
|
DeviceHandler::DeviceHandler()
|
|
: DeviceHandler(std::vector<Permissions>{}, std::vector<SysfsPermissions>{},
|
|
std::vector<Subsystem>{}, std::set<std::string>{}, false) {}
|
|
|
|
} // namespace init
|
|
} // namespace android
|