Snap for 10531979 from 38dd1561063de13d4f121ec5127ed077d744cb8c to mainline-media-releaseaml_med_341011000aml_med_340922010

Change-Id: I4e7abaa37a2bbc1fadc733c9fa0d0f64830b17d7

1 files changed, 42 insertions, 57 deletions

diff --git a/init/property_service.cpp b/init/property_service.cpp
index 4242912ed..8da69822c 100644
--- a/init/property_service.cpp
+++ b/init/property_service.cpp
@@ -57,12 +57,12 @@
 #include <android-base/result.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
-#include <private/android_filesystem_config.h>
 #include <property_info_parser/property_info_parser.h>
 #include <property_info_serializer/property_info_serializer.h>
 #include <selinux/android.h>
 #include <selinux/label.h>
 #include <selinux/selinux.h>
+
 #include "debug_ramdisk.h"
 #include "epoll.h"
 #include "init.h"
@@ -111,12 +111,12 @@ constexpr auto API_LEVEL_CURRENT = 10000;
 
 static bool persistent_properties_loaded = false;
 
+static int property_set_fd = -1;
 static int from_init_socket = -1;
 static int init_socket = -1;
 static bool accept_messages = false;
 static std::mutex accept_messages_lock;
 static std::thread property_service_thread;
-static std::thread property_service_for_system_thread;
 
 static std::unique_ptr<PersistWriteThread> persist_write_thread;
 
@@ -394,37 +394,31 @@ static std::optional<uint32_t> PropertySet(const std::string& name, const std::s
         return {PROP_ERROR_INVALID_VALUE};
     }
 
-    if (name == "sys.powerctl") {
-        // No action here - NotifyPropertyChange will trigger the appropriate action, and since this
-        // can come to the second thread, we mustn't call out to the __system_property_* functions
-        // which support multiple readers but only one mutator.
-    } else {
-        prop_info* pi = (prop_info*)__system_property_find(name.c_str());
-        if (pi != nullptr) {
-            // ro.* properties are actually "write-once".
-            if (StartsWith(name, "ro.")) {
-                *error = "Read-only property was already set";
-                return {PROP_ERROR_READ_ONLY_PROPERTY};
-            }
+    prop_info* pi = (prop_info*)__system_property_find(name.c_str());
+    if (pi != nullptr) {
+        // ro.* properties are actually "write-once".
+        if (StartsWith(name, "ro.")) {
+            *error = "Read-only property was already set";
+            return {PROP_ERROR_READ_ONLY_PROPERTY};
+        }
 
-            __system_property_update(pi, value.c_str(), valuelen);
-        } else {
-            int rc = __system_property_add(name.c_str(), name.size(), value.c_str(), valuelen);
-            if (rc < 0) {
-                *error = "__system_property_add failed";
-                return {PROP_ERROR_SET_FAILED};
-            }
+        __system_property_update(pi, value.c_str(), valuelen);
+    } else {
+        int rc = __system_property_add(name.c_str(), name.size(), value.c_str(), valuelen);
+        if (rc < 0) {
+            *error = "__system_property_add failed";
+            return {PROP_ERROR_SET_FAILED};
         }
+    }
 
-        // Don't write properties to disk until after we have read all default
-        // properties to prevent them from being overwritten by default values.
-        if (socket && persistent_properties_loaded && StartsWith(name, "persist.")) {
-            if (persist_write_thread) {
-                persist_write_thread->Write(name, value, std::move(*socket));
-                return {};
-            }
-            WritePersistentProperty(name, value);
+    // Don't write properties to disk until after we have read all default
+    // properties to prevent them from being overwritten by default values.
+    if (socket && persistent_properties_loaded && StartsWith(name, "persist.")) {
+        if (persist_write_thread) {
+            persist_write_thread->Write(name, value, std::move(*socket));
+            return {};
         }
+        WritePersistentProperty(name, value);
     }
 
     NotifyPropertyChange(name, value);
@@ -585,10 +579,10 @@ uint32_t HandlePropertySetNoSocket(const std::string& name, const std::string& v
     return *ret;
 }
 
-static void handle_property_set_fd(int fd) {
+static void handle_property_set_fd() {
     static constexpr uint32_t kDefaultSocketTimeout = 2000; /* ms */
 
-    int s = accept4(fd, nullptr, nullptr, SOCK_CLOEXEC);
+    int s = accept4(property_set_fd, nullptr, nullptr, SOCK_CLOEXEC);
     if (s == -1) {
         return;
     }
@@ -1425,21 +1419,19 @@ static void HandleInitSocket() {
     }
 }
 
-static void PropertyServiceThread(int fd, bool listen_init) {
+static void PropertyServiceThread() {
     Epoll epoll;
     if (auto result = epoll.Open(); !result.ok()) {
         LOG(FATAL) << result.error();
     }
 
-    if (auto result = epoll.RegisterHandler(fd, std::bind(handle_property_set_fd, fd));
+    if (auto result = epoll.RegisterHandler(property_set_fd, handle_property_set_fd);
         !result.ok()) {
         LOG(FATAL) << result.error();
     }
 
-    if (listen_init) {
-        if (auto result = epoll.RegisterHandler(init_socket, HandleInitSocket); !result.ok()) {
-            LOG(FATAL) << result.error();
-        }
+    if (auto result = epoll.RegisterHandler(init_socket, HandleInitSocket); !result.ok()) {
+        LOG(FATAL) << result.error();
     }
 
     while (true) {
@@ -1490,23 +1482,6 @@ void PersistWriteThread::Write(std::string name, std::string value, SocketConnec
     cv_.notify_all();
 }
 
-void StartThread(const char* name, int mode, int gid, std::thread& t, bool listen_init) {
-    int fd = -1;
-    if (auto result = CreateSocket(name, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
-                                   /*passcred=*/false, /*should_listen=*/false, mode, /*uid=*/0,
-                                   /*gid=*/gid, /*socketcon=*/{});
-        result.ok()) {
-        fd = *result;
-    } else {
-        LOG(FATAL) << "start_property_service socket creation failed: " << result.error();
-    }
-
-    listen(fd, 8);
-
-    auto new_thread = std::thread(PropertyServiceThread, fd, listen_init);
-    t.swap(new_thread);
-}
-
 void StartPropertyService(int* epoll_socket) {
     InitPropertySet("ro.property_service.version", "2");
 
@@ -1518,9 +1493,19 @@ void StartPropertyService(int* epoll_socket) {
     init_socket = sockets[1];
     StartSendingMessages();
 
-    StartThread(PROP_SERVICE_FOR_SYSTEM_NAME, 0660, AID_SYSTEM, property_service_for_system_thread,
-                true);
-    StartThread(PROP_SERVICE_NAME, 0666, 0, property_service_thread, false);
+    if (auto result = CreateSocket(PROP_SERVICE_NAME, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
+                                   /*passcred=*/false, /*should_listen=*/false, 0666, /*uid=*/0,
+                                   /*gid=*/0, /*socketcon=*/{});
+        result.ok()) {
+        property_set_fd = *result;
+    } else {
+        LOG(FATAL) << "start_property_service socket creation failed: " << result.error();
+    }
+
+    listen(property_set_fd, 8);
+
+    auto new_thread = std::thread{PropertyServiceThread};
+    property_service_thread.swap(new_thread);
 
     auto async_persist_writes =
             android::base::GetBoolProperty("ro.property_service.async_persist_writes", false);