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Allow modifying denylist without enforcement

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topjohnwu
2022-01-15 23:46:08 -08:00
parent c38b826abf
commit 76ddfeb93a
6 changed files with 100 additions and 100 deletions
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native/jni/zygisk/entry.cpp
+3 -17
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@@ -312,8 +312,7 @@ static void magiskd_passthrough(int client) {
send_fd(client, is_64_bit ? app_process_64 : app_process_32);
}
int cached_manager_app_id = -1;
static time_t last_modified = 0;
atomic<int> cached_manager_app_id = -1;
static void get_process_info(int client, const sock_cred *cred) {
AppInfo info{};
@@ -323,25 +322,12 @@ static void get_process_info(int client, const sock_cred *cred) {
// This function is called on every single zygote process specialization,
// so performance is critical. get_manager_app_id() is expensive as it goes
// through a SQLite query and potentially multiple filesystem stats, so we
// really want to cache the app ID value. Check the last modify timestamp of
// packages.xml and only re-fetch the manager app ID if something changed since
// we last checked. Granularity in seconds is good enough.
// If denylist is enabled, inotify will invalidate the app ID cache for us.
// In this case, we can skip the timestamp check all together.
// really want to cache the app ID value. inotify will invalidate the app ID
// cache for us.
if (uid != 1000) {
int manager_app_id = cached_manager_app_id;
// Denylist not enabled, check packages.xml timestamp
if (!denylist_enabled && manager_app_id > 0) {
struct stat st{};
stat("/data/system/packages.xml", &st);
if (st.st_atim.tv_sec > last_modified) {
manager_app_id = -1;
last_modified = st.st_atim.tv_sec;
}
}
if (manager_app_id < 0) {
manager_app_id = get_manager_app_id();
cached_manager_app_id = manager_app_id;