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platform_system_core/init/service_parser.cpp
Suren Baghdasaryan c29c2baa69 init: Add support for native service registration with lmkd 
init should be able to register native services with lmkd so that they
can be killed when needed. Only processes with oom_score_adjust not
equal to the default -1000 will be registered with lmkd because with the
score that low the process is unkillable anyway.
Inform lmkd when a registered process is killed so that the record can be
removed.
Change init.rc to start lmkd during init phase so that it is there to
register other services.
Replace hardcoded oom_score_adj values with appropriate definitions.

Bug: 129011369
Test: boot and verify native service registration
Change-Id: Ie5ed62203395120d86dc1c8250fae01aa0b3c511
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
2019-11-07 18:19:31 +00:00

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/*
* Copyright (C) 2019 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 "service_parser.h"
#include <linux/input.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <algorithm>
#include <sstream>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/strings.h>
#include <hidl-util/FQName.h>
#include <system/thread_defs.h>
#include "lmkd_service.h"
#include "rlimit_parser.h"
#include "service_utils.h"
#include "util.h"
#if defined(__ANDROID__)
#include <android/api-level.h>
#include <sys/system_properties.h>
#include "selinux.h"
#else
#include "host_init_stubs.h"
#endif
using android::base::ParseInt;
using android::base::Split;
using android::base::StartsWith;
namespace android {
namespace init {
Result<void> ServiceParser::ParseCapabilities(std::vector<std::string>&& args) {
service_->capabilities_ = 0;
if (!CapAmbientSupported()) {
return Error()
<< "capabilities requested but the kernel does not support ambient capabilities";
}
unsigned int last_valid_cap = GetLastValidCap();
if (last_valid_cap >= service_->capabilities_->size()) {
LOG(WARNING) << "last valid run-time capability is larger than CAP_LAST_CAP";
}
for (size_t i = 1; i < args.size(); i++) {
const std::string& arg = args[i];
int res = LookupCap(arg);
if (res < 0) {
return Errorf("invalid capability '{}'", arg);
}
unsigned int cap = static_cast<unsigned int>(res); // |res| is >= 0.
if (cap > last_valid_cap) {
return Errorf("capability '{}' not supported by the kernel", arg);
}
(*service_->capabilities_)[cap] = true;
}
return {};
}
Result<void> ServiceParser::ParseClass(std::vector<std::string>&& args) {
service_->classnames_ = std::set<std::string>(args.begin() + 1, args.end());
return {};
}
Result<void> ServiceParser::ParseConsole(std::vector<std::string>&& args) {
if (service_->proc_attr_.stdio_to_kmsg) {
return Error() << "'console' and 'stdio_to_kmsg' are mutually exclusive";
}
service_->flags_ |= SVC_CONSOLE;
service_->proc_attr_.console = args.size() > 1 ? "/dev/" + args[1] : "";
return {};
}
Result<void> ServiceParser::ParseCritical(std::vector<std::string>&& args) {
service_->flags_ |= SVC_CRITICAL;
return {};
}
Result<void> ServiceParser::ParseDisabled(std::vector<std::string>&& args) {
service_->flags_ |= SVC_DISABLED;
service_->flags_ |= SVC_RC_DISABLED;
return {};
}
Result<void> ServiceParser::ParseEnterNamespace(std::vector<std::string>&& args) {
if (args[1] != "net") {
return Error() << "Init only supports entering network namespaces";
}
if (!service_->namespaces_.namespaces_to_enter.empty()) {
return Error() << "Only one network namespace may be entered";
}
// Network namespaces require that /sys is remounted, otherwise the old adapters will still be
// present. Therefore, they also require mount namespaces.
service_->namespaces_.flags |= CLONE_NEWNS;
service_->namespaces_.namespaces_to_enter.emplace_back(CLONE_NEWNET, std::move(args[2]));
return {};
}
Result<void> ServiceParser::ParseGroup(std::vector<std::string>&& args) {
auto gid = DecodeUid(args[1]);
if (!gid) {
return Error() << "Unable to decode GID for '" << args[1] << "': " << gid.error();
}
service_->proc_attr_.gid = *gid;
for (std::size_t n = 2; n < args.size(); n++) {
gid = DecodeUid(args[n]);
if (!gid) {
return Error() << "Unable to decode GID for '" << args[n] << "': " << gid.error();
}
service_->proc_attr_.supp_gids.emplace_back(*gid);
}
return {};
}
Result<void> ServiceParser::ParsePriority(std::vector<std::string>&& args) {
service_->proc_attr_.priority = 0;
if (!ParseInt(args[1], &service_->proc_attr_.priority,
static_cast<int>(ANDROID_PRIORITY_HIGHEST), // highest is negative
static_cast<int>(ANDROID_PRIORITY_LOWEST))) {
return Errorf("process priority value must be range {} - {}", ANDROID_PRIORITY_HIGHEST,
ANDROID_PRIORITY_LOWEST);
}
return {};
}
Result<void> ServiceParser::ParseInterface(std::vector<std::string>&& args) {
const std::string& interface_name = args[1];
const std::string& instance_name = args[2];
// AIDL services don't use fully qualified names and instead just use "interface aidl <name>"
if (interface_name != "aidl") {
FQName fq_name;
if (!FQName::parse(interface_name, &fq_name)) {
return Error() << "Invalid fully-qualified name for interface '" << interface_name
<< "'";
}
if (!fq_name.isFullyQualified()) {
return Error() << "Interface name not fully-qualified '" << interface_name << "'";
}
if (fq_name.isValidValueName()) {
return Error() << "Interface name must not be a value name '" << interface_name << "'";
}
}
const std::string fullname = interface_name + "/" + instance_name;
for (const auto& svc : *service_list_) {
if (svc->interfaces().count(fullname) > 0) {
return Error() << "Interface '" << fullname << "' redefined in " << service_->name()
<< " but is already defined by " << svc->name();
}
}
service_->interfaces_.insert(fullname);
return {};
}
Result<void> ServiceParser::ParseIoprio(std::vector<std::string>&& args) {
if (!ParseInt(args[2], &service_->proc_attr_.ioprio_pri, 0, 7)) {
return Error() << "priority value must be range 0 - 7";
}
if (args[1] == "rt") {
service_->proc_attr_.ioprio_class = IoSchedClass_RT;
} else if (args[1] == "be") {
service_->proc_attr_.ioprio_class = IoSchedClass_BE;
} else if (args[1] == "idle") {
service_->proc_attr_.ioprio_class = IoSchedClass_IDLE;
} else {
return Error() << "ioprio option usage: ioprio <rt|be|idle> <0-7>";
}
return {};
}
Result<void> ServiceParser::ParseKeycodes(std::vector<std::string>&& args) {
auto it = args.begin() + 1;
if (args.size() == 2 && StartsWith(args[1], "$")) {
auto expanded = ExpandProps(args[1]);
if (!expanded) {
return expanded.error();
}
// If the property is not set, it defaults to none, in which case there are no keycodes
// for this service.
if (expanded == "none") {
return {};
}
args = Split(*expanded, ",");
it = args.begin();
}
for (; it != args.end(); ++it) {
int code;
if (ParseInt(*it, &code, 0, KEY_MAX)) {
for (auto& key : service_->keycodes_) {
if (key == code) return Error() << "duplicate keycode: " << *it;
}
service_->keycodes_.insert(
std::upper_bound(service_->keycodes_.begin(), service_->keycodes_.end(), code),
code);
} else {
return Error() << "invalid keycode: " << *it;
}
}
return {};
}
Result<void> ServiceParser::ParseOneshot(std::vector<std::string>&& args) {
service_->flags_ |= SVC_ONESHOT;
return {};
}
Result<void> ServiceParser::ParseOnrestart(std::vector<std::string>&& args) {
args.erase(args.begin());
int line = service_->onrestart_.NumCommands() + 1;
if (auto result = service_->onrestart_.AddCommand(std::move(args), line); !result) {
return Error() << "cannot add Onrestart command: " << result.error();
}
return {};
}
Result<void> ServiceParser::ParseNamespace(std::vector<std::string>&& args) {
for (size_t i = 1; i < args.size(); i++) {
if (args[i] == "pid") {
service_->namespaces_.flags |= CLONE_NEWPID;
// PID namespaces require mount namespaces.
service_->namespaces_.flags |= CLONE_NEWNS;
} else if (args[i] == "mnt") {
service_->namespaces_.flags |= CLONE_NEWNS;
} else {
return Error() << "namespace must be 'pid' or 'mnt'";
}
}
return {};
}
Result<void> ServiceParser::ParseOomScoreAdjust(std::vector<std::string>&& args) {
if (!ParseInt(args[1], &service_->oom_score_adjust_, MIN_OOM_SCORE_ADJUST,
MAX_OOM_SCORE_ADJUST)) {
return Error() << "oom_score_adjust value must be in range " << MIN_OOM_SCORE_ADJUST
<< " - +" << MAX_OOM_SCORE_ADJUST;
}
return {};
}
Result<void> ServiceParser::ParseOverride(std::vector<std::string>&& args) {
service_->override_ = true;
return {};
}
Result<void> ServiceParser::ParseMemcgSwappiness(std::vector<std::string>&& args) {
if (!ParseInt(args[1], &service_->swappiness_, 0)) {
return Error() << "swappiness value must be equal or greater than 0";
}
return {};
}
Result<void> ServiceParser::ParseMemcgLimitInBytes(std::vector<std::string>&& args) {
if (!ParseInt(args[1], &service_->limit_in_bytes_, 0)) {
return Error() << "limit_in_bytes value must be equal or greater than 0";
}
return {};
}
Result<void> ServiceParser::ParseMemcgLimitPercent(std::vector<std::string>&& args) {
if (!ParseInt(args[1], &service_->limit_percent_, 0)) {
return Error() << "limit_percent value must be equal or greater than 0";
}
return {};
}
Result<void> ServiceParser::ParseMemcgLimitProperty(std::vector<std::string>&& args) {
service_->limit_property_ = std::move(args[1]);
return {};
}
Result<void> ServiceParser::ParseMemcgSoftLimitInBytes(std::vector<std::string>&& args) {
if (!ParseInt(args[1], &service_->soft_limit_in_bytes_, 0)) {
return Error() << "soft_limit_in_bytes value must be equal or greater than 0";
}
return {};
}
Result<void> ServiceParser::ParseProcessRlimit(std::vector<std::string>&& args) {
auto rlimit = ParseRlimit(args);
if (!rlimit) return rlimit.error();
service_->proc_attr_.rlimits.emplace_back(*rlimit);
return {};
}
Result<void> ServiceParser::ParseRebootOnFailure(std::vector<std::string>&& args) {
if (service_->on_failure_reboot_target_) {
return Error() << "Only one reboot_on_failure command may be specified";
}
if (!StartsWith(args[1], "shutdown") && !StartsWith(args[1], "reboot")) {
return Error()
<< "reboot_on_failure commands must begin with either 'shutdown' or 'reboot'";
}
service_->on_failure_reboot_target_ = std::move(args[1]);
return {};
}
Result<void> ServiceParser::ParseRestartPeriod(std::vector<std::string>&& args) {
int period;
if (!ParseInt(args[1], &period, 5)) {
return Error() << "restart_period value must be an integer >= 5";
}
service_->restart_period_ = std::chrono::seconds(period);
return {};
}
Result<void> ServiceParser::ParseSeclabel(std::vector<std::string>&& args) {
service_->seclabel_ = std::move(args[1]);
return {};
}
Result<void> ServiceParser::ParseSigstop(std::vector<std::string>&& args) {
service_->sigstop_ = true;
return {};
}
Result<void> ServiceParser::ParseSetenv(std::vector<std::string>&& args) {
service_->environment_vars_.emplace_back(std::move(args[1]), std::move(args[2]));
return {};
}
Result<void> ServiceParser::ParseShutdown(std::vector<std::string>&& args) {
if (args[1] == "critical") {
service_->flags_ |= SVC_SHUTDOWN_CRITICAL;
return {};
}
return Error() << "Invalid shutdown option";
}
Result<void> ServiceParser::ParseTimeoutPeriod(std::vector<std::string>&& args) {
int period;
if (!ParseInt(args[1], &period, 1)) {
return Error() << "timeout_period value must be an integer >= 1";
}
service_->timeout_period_ = std::chrono::seconds(period);
return {};
}
// name type perm [ uid gid context ]
Result<void> ServiceParser::ParseSocket(std::vector<std::string>&& args) {
SocketDescriptor socket;
socket.name = std::move(args[1]);
auto types = Split(args[2], "+");
if (types[0] == "stream") {
socket.type = SOCK_STREAM;
} else if (types[0] == "dgram") {
socket.type = SOCK_DGRAM;
} else if (types[0] == "seqpacket") {
socket.type = SOCK_SEQPACKET;
} else {
return Error() << "socket type must be 'dgram', 'stream' or 'seqpacket', got '" << types[0]
<< "' instead.";
}
if (types.size() > 1) {
if (types.size() == 2 && types[1] == "passcred") {
socket.passcred = true;
} else {
return Error() << "Only 'passcred' may be used to modify the socket type";
}
}
errno = 0;
char* end = nullptr;
socket.perm = strtol(args[3].c_str(), &end, 8);
if (errno != 0) {
return ErrnoError() << "Unable to parse permissions '" << args[3] << "'";
}
if (end == args[3].c_str() || *end != '\0') {
errno = EINVAL;
return ErrnoError() << "Unable to parse permissions '" << args[3] << "'";
}
if (args.size() > 4) {
auto uid = DecodeUid(args[4]);
if (!uid) {
return Error() << "Unable to find UID for '" << args[4] << "': " << uid.error();
}
socket.uid = *uid;
}
if (args.size() > 5) {
auto gid = DecodeUid(args[5]);
if (!gid) {
return Error() << "Unable to find GID for '" << args[5] << "': " << gid.error();
}
socket.gid = *gid;
}
socket.context = args.size() > 6 ? args[6] : "";
auto old = std::find_if(service_->sockets_.begin(), service_->sockets_.end(),
[&socket](const auto& other) { return socket.name == other.name; });
if (old != service_->sockets_.end()) {
return Error() << "duplicate socket descriptor '" << socket.name << "'";
}
service_->sockets_.emplace_back(std::move(socket));
return {};
}
Result<void> ServiceParser::ParseStdioToKmsg(std::vector<std::string>&& args) {
if (service_->flags_ & SVC_CONSOLE) {
return Error() << "'stdio_to_kmsg' and 'console' are mutually exclusive";
}
service_->proc_attr_.stdio_to_kmsg = true;
return {};
}
// name type
Result<void> ServiceParser::ParseFile(std::vector<std::string>&& args) {
if (args[2] != "r" && args[2] != "w" && args[2] != "rw") {
return Error() << "file type must be 'r', 'w' or 'rw'";
}
FileDescriptor file;
file.type = args[2];
auto file_name = ExpandProps(args[1]);
if (!file_name) {
return Error() << "Could not expand file path ': " << file_name.error();
}
file.name = *file_name;
if (file.name[0] != '/' || file.name.find("../") != std::string::npos) {
return Error() << "file name must not be relative";
}
auto old = std::find_if(service_->files_.begin(), service_->files_.end(),
[&file](const auto& other) { return other.name == file.name; });
if (old != service_->files_.end()) {
return Error() << "duplicate file descriptor '" << file.name << "'";
}
service_->files_.emplace_back(std::move(file));
return {};
}
Result<void> ServiceParser::ParseUser(std::vector<std::string>&& args) {
auto uid = DecodeUid(args[1]);
if (!uid) {
return Error() << "Unable to find UID for '" << args[1] << "': " << uid.error();
}
service_->proc_attr_.uid = *uid;
return {};
}
Result<void> ServiceParser::ParseWritepid(std::vector<std::string>&& args) {
args.erase(args.begin());
service_->writepid_files_ = std::move(args);
return {};
}
Result<void> ServiceParser::ParseUpdatable(std::vector<std::string>&& args) {
service_->updatable_ = true;
return {};
}
const KeywordMap<ServiceParser::OptionParser>& ServiceParser::GetParserMap() const {
constexpr std::size_t kMax = std::numeric_limits<std::size_t>::max();
// clang-format off
static const KeywordMap<ServiceParser::OptionParser> parser_map = {
{"capabilities", {0, kMax, &ServiceParser::ParseCapabilities}},
{"class", {1, kMax, &ServiceParser::ParseClass}},
{"console", {0, 1, &ServiceParser::ParseConsole}},
{"critical", {0, 0, &ServiceParser::ParseCritical}},
{"disabled", {0, 0, &ServiceParser::ParseDisabled}},
{"enter_namespace", {2, 2, &ServiceParser::ParseEnterNamespace}},
{"file", {2, 2, &ServiceParser::ParseFile}},
{"group", {1, NR_SVC_SUPP_GIDS + 1, &ServiceParser::ParseGroup}},
{"interface", {2, 2, &ServiceParser::ParseInterface}},
{"ioprio", {2, 2, &ServiceParser::ParseIoprio}},
{"keycodes", {1, kMax, &ServiceParser::ParseKeycodes}},
{"memcg.limit_in_bytes", {1, 1, &ServiceParser::ParseMemcgLimitInBytes}},
{"memcg.limit_percent", {1, 1, &ServiceParser::ParseMemcgLimitPercent}},
{"memcg.limit_property", {1, 1, &ServiceParser::ParseMemcgLimitProperty}},
{"memcg.soft_limit_in_bytes",
{1, 1, &ServiceParser::ParseMemcgSoftLimitInBytes}},
{"memcg.swappiness", {1, 1, &ServiceParser::ParseMemcgSwappiness}},
{"namespace", {1, 2, &ServiceParser::ParseNamespace}},
{"oneshot", {0, 0, &ServiceParser::ParseOneshot}},
{"onrestart", {1, kMax, &ServiceParser::ParseOnrestart}},
{"oom_score_adjust", {1, 1, &ServiceParser::ParseOomScoreAdjust}},
{"override", {0, 0, &ServiceParser::ParseOverride}},
{"priority", {1, 1, &ServiceParser::ParsePriority}},
{"reboot_on_failure", {1, 1, &ServiceParser::ParseRebootOnFailure}},
{"restart_period", {1, 1, &ServiceParser::ParseRestartPeriod}},
{"rlimit", {3, 3, &ServiceParser::ParseProcessRlimit}},
{"seclabel", {1, 1, &ServiceParser::ParseSeclabel}},
{"setenv", {2, 2, &ServiceParser::ParseSetenv}},
{"shutdown", {1, 1, &ServiceParser::ParseShutdown}},
{"sigstop", {0, 0, &ServiceParser::ParseSigstop}},
{"socket", {3, 6, &ServiceParser::ParseSocket}},
{"stdio_to_kmsg", {0, 0, &ServiceParser::ParseStdioToKmsg}},
{"timeout_period", {1, 1, &ServiceParser::ParseTimeoutPeriod}},
{"updatable", {0, 0, &ServiceParser::ParseUpdatable}},
{"user", {1, 1, &ServiceParser::ParseUser}},
{"writepid", {1, kMax, &ServiceParser::ParseWritepid}},
};
// clang-format on
return parser_map;
}
Result<void> ServiceParser::ParseSection(std::vector<std::string>&& args,
const std::string& filename, int line) {
if (args.size() < 3) {
return Error() << "services must have a name and a program";
}
const std::string& name = args[1];
if (!IsValidName(name)) {
return Error() << "invalid service name '" << name << "'";
}
filename_ = filename;
Subcontext* restart_action_subcontext = nullptr;
if (subcontext_ && subcontext_->PathMatchesSubcontext(filename)) {
restart_action_subcontext = subcontext_;
}
std::vector<std::string> str_args(args.begin() + 2, args.end());
if (SelinuxGetVendorAndroidVersion() <= __ANDROID_API_P__) {
if (str_args[0] == "/sbin/watchdogd") {
str_args[0] = "/system/bin/watchdogd";
}
}
if (SelinuxGetVendorAndroidVersion() <= __ANDROID_API_Q__) {
if (str_args[0] == "/charger") {
str_args[0] = "/system/bin/charger";
}
}
service_ = std::make_unique<Service>(name, restart_action_subcontext, str_args);
return {};
}
Result<void> ServiceParser::ParseLineSection(std::vector<std::string>&& args, int line) {
if (!service_) {
return {};
}
auto parser = GetParserMap().Find(args);
if (!parser) return parser.error();
return std::invoke(*parser, this, std::move(args));
}
Result<void> ServiceParser::EndSection() {
if (!service_) {
return {};
}
if (interface_inheritance_hierarchy_) {
if (const auto& check_hierarchy_result = CheckInterfaceInheritanceHierarchy(
service_->interfaces(), *interface_inheritance_hierarchy_);
!check_hierarchy_result) {
return Error() << check_hierarchy_result.error();
}
}
Service* old_service = service_list_->FindService(service_->name());
if (old_service) {
if (!service_->is_override()) {
return Error() << "ignored duplicate definition of service '" << service_->name()
<< "'";
}
if (StartsWith(filename_, "/apex/") && !old_service->is_updatable()) {
return Error() << "cannot update a non-updatable service '" << service_->name()
<< "' with a config in APEX";
}
service_list_->RemoveService(*old_service);
old_service = nullptr;
}
service_list_->AddService(std::move(service_));
return {};
}
bool ServiceParser::IsValidName(const std::string& name) const {
// Property names can be any length, but may only contain certain characters.
// Property values can contain any characters, but may only be a certain length.
// (The latter restriction is needed because `start` and `stop` work by writing
// the service name to the "ctl.start" and "ctl.stop" properties.)
return IsLegalPropertyName("init.svc." + name) && name.size() <= PROP_VALUE_MAX;
}
} // namespace init
} // namespace android
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