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init: log when 'user' is unspecified

Browse source 
NOTE: in master, but should be submitted in AOSP.
Waiting to hear from security folks. Also might
need cleanup.

Not currently done. Seems errorprone.

Bug: 276813155
Test: boot, check logs
Change-Id: I7cbc39b282889dd582f06a8eedc38ae637c8edec
This commit is contained in:
Steven Moreland 2023-04-03 23:29:22 +00:00
parent b2fdbef489
commit f5d22ef7cd
5 changed files with 31 additions and 24 deletions
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36
init/service.cpp
View file

@ -140,9 +140,10 @@ bool Service::is_exec_service_running_ = false;
Service::Service(const std::string& name, Subcontext* subcontext_for_restart_commands,
const std::string& filename, const std::vector<std::string>& args)
: Service(name, 0, 0, 0, {}, 0, "", subcontext_for_restart_commands, filename, args) {}
: Service(name, 0, std::nullopt, 0, {}, 0, "", subcontext_for_restart_commands, filename,
args) {}
Service::Service(const std::string& name, unsigned flags, uid_t uid, gid_t gid,
Service::Service(const std::string& name, unsigned flags, std::optional<uid_t> uid, gid_t gid,
const std::vector<gid_t>& supp_gids, int namespace_flags,
const std::string& seclabel, Subcontext* subcontext_for_restart_commands,
const std::string& filename, const std::vector<std::string>& args)
@ -153,7 +154,7 @@ Service::Service(const std::string& name, unsigned flags, uid_t uid, gid_t gid,
crash_count_(0),
proc_attr_{.ioprio_class = IoSchedClass_NONE,
.ioprio_pri = 0,
.uid = uid,
.parsed_uid = uid,
.gid = gid,
.supp_gids = supp_gids,
.priority = 0},
@ -205,9 +206,9 @@ void Service::KillProcessGroup(int signal, bool report_oneshot) {
int max_processes = 0;
int r;
if (signal == SIGTERM) {
r = killProcessGroupOnce(proc_attr_.uid, pid_, signal, &max_processes);
r = killProcessGroupOnce(uid(), pid_, signal, &max_processes);
} else {
r = killProcessGroup(proc_attr_.uid, pid_, signal, &max_processes);
r = killProcessGroup(uid(), pid_, signal, &max_processes);
}
if (report_oneshot && max_processes > 0) {
@ -228,7 +229,7 @@ void Service::KillProcessGroup(int signal, bool report_oneshot) {
void Service::SetProcessAttributesAndCaps(InterprocessFifo setsid_finished) {
// Keep capabilites on uid change.
if (capabilities_ && proc_attr_.uid) {
if (capabilities_ && uid()) {
// If Android is running in a container, some securebits might already
// be locked, so don't change those.
unsigned long securebits = prctl(PR_GET_SECUREBITS);
@ -255,7 +256,7 @@ void Service::SetProcessAttributesAndCaps(InterprocessFifo setsid_finished) {
if (!SetCapsForExec(*capabilities_)) {
LOG(FATAL) << "cannot set capabilities for " << name_;
}
} else if (proc_attr_.uid) {
} else if (uid()) {
// Inheritable caps can be non-zero when running in a container.
if (!DropInheritableCaps()) {
LOG(FATAL) << "cannot drop inheritable caps for " << name_;
@ -434,8 +435,8 @@ Result<void> Service::ExecStart() {
flags_ |= SVC_EXEC;
is_exec_service_running_ = true;
LOG(INFO) << "SVC_EXEC service '" << name_ << "' pid " << pid_ << " (uid " << proc_attr_.uid
<< " gid " << proc_attr_.gid << "+" << proc_attr_.supp_gids.size() << " context "
LOG(INFO) << "SVC_EXEC service '" << name_ << "' pid " << pid_ << " (uid " << uid() << " gid "
<< proc_attr_.gid << "+" << proc_attr_.supp_gids.size() << " context "
<< (!seclabel_.empty() ? seclabel_ : "default") << ") started; waiting...";
reboot_on_failure.Disable();
@ -475,13 +476,13 @@ Result<void> Service::CheckConsole() {
// Configures the memory cgroup properties for the service.
void Service::ConfigureMemcg() {
if (swappiness_ != -1) {
if (!setProcessGroupSwappiness(proc_attr_.uid, pid_, swappiness_)) {
if (!setProcessGroupSwappiness(uid(), pid_, swappiness_)) {
PLOG(ERROR) << "setProcessGroupSwappiness failed";
}
}
if (soft_limit_in_bytes_ != -1) {
if (!setProcessGroupSoftLimit(proc_attr_.uid, pid_, soft_limit_in_bytes_)) {
if (!setProcessGroupSoftLimit(uid(), pid_, soft_limit_in_bytes_)) {
PLOG(ERROR) << "setProcessGroupSoftLimit failed";
}
}
@ -508,7 +509,7 @@ void Service::ConfigureMemcg() {
}
if (computed_limit_in_bytes != size_t(-1)) {
if (!setProcessGroupLimit(proc_attr_.uid, pid_, computed_limit_in_bytes)) {
if (!setProcessGroupLimit(uid(), pid_, computed_limit_in_bytes)) {
PLOG(ERROR) << "setProcessGroupLimit failed";
}
}
@ -705,21 +706,20 @@ Result<void> Service::Start() {
if (CgroupsAvailable()) {
bool use_memcg = swappiness_ != -1 || soft_limit_in_bytes_ != -1 || limit_in_bytes_ != -1 ||
limit_percent_ != -1 || !limit_property_.empty();
errno = -createProcessGroup(proc_attr_.uid, pid_, use_memcg);
errno = -createProcessGroup(uid(), pid_, use_memcg);
if (errno != 0) {
Result<void> result = cgroups_activated.Write(kActivatingCgroupsFailed);
if (!result.ok()) {
return Error() << "Sending notification failed: " << result.error();
}
return Error() << "createProcessGroup(" << proc_attr_.uid << ", " << pid_ << ", "
<< use_memcg << ") failed for service '" << name_
<< "': " << strerror(errno);
return Error() << "createProcessGroup(" << uid() << ", " << pid_ << ", " << use_memcg
<< ") failed for service '" << name_ << "': " << strerror(errno);
}
// When the blkio controller is mounted in the v1 hierarchy, NormalIoPriority is
// the default (/dev/blkio). When the blkio controller is mounted in the v2 hierarchy, the
// NormalIoPriority profile has to be applied explicitly.
SetProcessProfiles(proc_attr_.uid, pid_, {"NormalIoPriority"});
SetProcessProfiles(uid(), pid_, {"NormalIoPriority"});
if (use_memcg) {
ConfigureMemcg();
@ -727,7 +727,7 @@ Result<void> Service::Start() {
}
if (oom_score_adjust_ != DEFAULT_OOM_SCORE_ADJUST) {
LmkdRegister(name_, proc_attr_.uid, pid_, oom_score_adjust_);
LmkdRegister(name_, uid(), pid_, oom_score_adjust_);
}
if (Result<void> result = cgroups_activated.Write(kCgroupsActivated); !result.ok()) {

4
init/service.h
View file

@ -71,7 +71,7 @@ class Service {
Service(const std::string& name, Subcontext* subcontext_for_restart_commands,
const std::string& filename, const std::vector<std::string>& args);
Service(const std::string& name, unsigned flags, uid_t uid, gid_t gid,
Service(const std::string& name, unsigned flags, std::optional<uid_t> uid, gid_t gid,
const std::vector<gid_t>& supp_gids, int namespace_flags, const std::string& seclabel,
Subcontext* subcontext_for_restart_commands, const std::string& filename,
const std::vector<std::string>& args);
@ -115,7 +115,7 @@ class Service {
pid_t pid() const { return pid_; }
android::base::boot_clock::time_point time_started() const { return time_started_; }
int crash_count() const { return crash_count_; }
uid_t uid() const { return proc_attr_.uid; }
uid_t uid() const { return proc_attr_.uid(); }
gid_t gid() const { return proc_attr_.gid; }
int namespace_flags() const { return namespaces_.flags; }
const std::vector<gid_t>& supp_gids() const { return proc_attr_.supp_gids; }

7
init/service_parser.cpp
View file

@ -534,7 +534,7 @@ Result<void> ServiceParser::ParseUser(std::vector<std::string>&& args) {
if (!uid.ok()) {
return Error() << "Unable to find UID for '" << args[1] << "': " << uid.error();
}
service_->proc_attr_.uid = *uid;
service_->proc_attr_.parsed_uid = *uid;
return {};
}
@ -677,6 +677,11 @@ Result<void> ServiceParser::EndSection() {
return {};
}
if (service_->proc_attr_.parsed_uid == std::nullopt) {
LOG(WARNING) << "No user specified for service '" << service_->name()
<< "'. Defaults to root.";
}
if (interface_inheritance_hierarchy_) {
if (const auto& check_hierarchy_result = CheckInterfaceInheritanceHierarchy(
service_->interfaces(), *interface_inheritance_hierarchy_);

4
init/service_utils.cpp
View file

@ -271,8 +271,8 @@ Result<void> SetProcessAttributes(const ProcessAttributes& attr, InterprocessFif
if (setgroups(attr.supp_gids.size(), const_cast<gid_t*>(&attr.supp_gids[0])) != 0) {
return ErrnoError() << "setgroups failed";
}
if (attr.uid) {
if (setuid(attr.uid) != 0) {
if (attr.uid()) {
if (setuid(attr.uid()) != 0) {
return ErrnoError() << "setuid failed";
}
}

4
init/service_utils.h
View file

@ -91,11 +91,13 @@ struct ProcessAttributes {
IoSchedClass ioprio_class;
int ioprio_pri;
std::vector<std::pair<int, rlimit>> rlimits;
uid_t uid;
std::optional<uid_t> parsed_uid;
gid_t gid;
std::vector<gid_t> supp_gids;
int priority;
bool stdio_to_kmsg;
uid_t uid() const { return parsed_uid.value_or(0); }
};
inline bool RequiresConsole(const ProcessAttributes& attr) {