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lazy-update app data path in ConfigManager::IsAppNeedHook() 

zygote always starts with `uid == 0` and then fork into a different user.
so we delay the evaluation until we get to the point where it's been hooked already.
this enabled multi-user support, since we can now find the config files!
This commit is contained in:
Victor Tseng 2020-03-24 02:10:30 +08:00 committed by Jim Wu
parent efe0869390
commit db5d51483d
2 changed files with 63 additions and 50 deletions
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57
edxp-core/src/main/cpp/main/src/config_manager.cpp
View File

@ -35,8 +35,7 @@ namespace edxp {
LOGI("using installer %s", kLegacyInstallerPkgName);
return kLegacyInstallerPkgName;
}
LOGE("no supported installer app found, using primary as default %s",
kPrimaryInstallerPkgName);
LOGE("no supported installer app found, using default: %s", kPrimaryInstallerPkgName);
return kPrimaryInstallerPkgName;
}
@ -67,10 +66,16 @@ namespace edxp {
}
}
void ConfigManager::InitOnce() {
if (!initialized_) {
use_prot_storage_ = GetAndroidApiLevel() >= ANDROID_N;
data_path_prefix_ = use_prot_storage_ ? "/data/user_de/0/" : "/data/user/0/";
void ConfigManager::UpdateConfigPath(const uid_t user) {
if (last_user_ != user) {
LOGI("updating config data paths from %u to %u...", last_user_, user);
last_user_ = user;
}
const char *format = use_prot_storage_ ? "/data/user_de/%u/" : "/data/user/%u/";
char buff[PATH_MAX];
snprintf(buff, sizeof(buff), format, last_user_);
data_path_prefix_ = buff;
installer_pkg_name_ = RetrieveInstallerPkgName();
base_config_path_ = GetConfigPath("");
@ -86,8 +91,9 @@ namespace edxp {
// use_white_list snapshot
use_white_list_snapshot_ = access(use_whitelist_path_.c_str(), F_OK) == 0;
LOGI("application list mode: %s, using whitelist: %s",
BoolToString(black_white_list_enabled_), BoolToString(use_white_list_snapshot_));
LOGI("data path prefix: %s", data_path_prefix_.c_str());
LOGI(" application list mode: %s", BoolToString(black_white_list_enabled_));
LOGI(" using whitelist: %s", BoolToString(use_white_list_snapshot_));
LOGI(" dynamic modules mode: %s", BoolToString(dynamic_modules_enabled_));
LOGI(" resources hook: %s", BoolToString(resources_hook_enabled_));
LOGI(" deopt boot image: %s", BoolToString(deopt_boot_image_enabled_));
@ -95,11 +101,25 @@ namespace edxp {
if (black_white_list_enabled_) {
SnapshotBlackWhiteList();
}
initialized_ = true;
}
bool ConfigManager::IsAppNeedHook(const std::string &app_data_dir) {
// zygote always starts with `uid == 0` and then fork into different user.
// so we have to check if we are the correct user or not.
uid_t user = 0;
char package_name[PATH_MAX];
if (sscanf(app_data_dir.c_str(), "/data/%*[^/]/%u/%s", &user, package_name) != 2) {
if (sscanf(app_data_dir.c_str(), "/data/%*[^/]/%s", package_name) != 1) {
package_name[0] = '\0';
LOGE("can't parse %s", app_data_dir.c_str());
return false; // default to no hooking for safety
}
}
bool ConfigManager::IsAppNeedHook(const std::string &app_data_dir) const {
if (last_user_ != user) {
UpdateConfigPath(user);
}
if (!black_white_list_enabled_) {
return true;
}
@ -112,15 +132,6 @@ namespace edxp {
app_data_dir.c_str());
use_white_list = use_white_list_snapshot_;
}
int user = 0;
char package_name[PATH_MAX];
if (sscanf(app_data_dir.c_str(), "/data/%*[^/]/%d/%s", &user, package_name) != 2) {
if (sscanf(app_data_dir.c_str(), "/data/%*[^/]/%s", package_name) != 1) {
package_name[0] = '\0';
LOGE("can't parse %s", app_data_dir.c_str());
return !use_white_list;
}
}
if (strcmp(package_name, kPrimaryInstallerPkgName) == 0
|| strcmp(package_name, kLegacyInstallerPkgName) == 0) {
// always hook installer apps
@ -185,11 +196,9 @@ namespace edxp {
};
ConfigManager::ConfigManager() {
InitOnce();
}
ConfigManager::~ConfigManager() {
initialized_ = false;
use_prot_storage_ = GetAndroidApiLevel() >= ANDROID_N;
last_user_ = 0;
UpdateConfigPath(last_user_);
}
}

14
edxp-core/src/main/cpp/main/src/config_manager.h
View File

@ -22,20 +22,26 @@ namespace edxp {
}
bool IsBlackWhiteListEnabled() const;
bool IsDynamicModulesEnabled() const;
bool IsResourcesHookEnabled() const;
bool IsDeoptBootImageEnabled() const;
bool IsNoModuleLogEnabled() const;
std::string GetInstallerPackageName() const;
std::string GetDataPathPrefix() const;
std::string GetConfigPath(const std::string &suffix) const;
bool IsAppNeedHook(const std::string &app_data_dir) const;
bool IsAppNeedHook(const std::string &app_data_dir);
private:
inline static ConfigManager *instance_;
bool initialized_ = false;
uid_t last_user_ = false;
bool use_prot_storage_ = true;
std::string data_path_prefix_;
std::string installer_pkg_name_;
@ -55,9 +61,7 @@ namespace edxp {
ConfigManager();
~ConfigManager();
void InitOnce();
void UpdateConfigPath(const uid_t user);
void SnapshotBlackWhiteList();