TheArchive/Magisk
1
0
Fork 0
mirror of https://github.com/topjohnwu/Magisk.git synced 2025-10-16 09:52:31 +00:00
Code Issues Packages Projects Releases Wiki Activity

Implement MagiskHide through code injection

Browse Source
This commit is contained in:
topjohnwu
2021-01-12 03:28:00 -08:00
parent d2acd59ea8
commit 9a28dd4f6e
8 changed files with 166 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
native/jni/core/daemon.cpp
View File

@@ -36,10 +36,20 @@ static bool verify_client(pid_t pid) {
return !(stat(path, &st) || st.st_dev != self_st.st_dev || st.st_ino != self_st.st_ino);
}
static bool check_zygote(pid_t pid) {
char buf[32];
sprintf(buf, "/proc/%d/attr/current", pid);
auto fp = open_file(buf, "r");
if (!fp)
return false;
fscanf(fp.get(), "%s", buf);
return buf == "u:r:zygote:s0"sv;
}
static void request_handler(int client, int req_code, ucred cred) {
switch (req_code) {
case MAGISKHIDE:
magiskhide_handler(client);
magiskhide_handler(client, &cred);
break;
case SUPERUSER:
su_daemon_handler(client, &cred);
@@ -74,7 +84,12 @@ static void handle_request(int client) {
// Verify client credentials
ucred cred;
get_client_cred(client, &cred);
if (cred.uid != 0 && !verify_client(cred.pid))
bool is_root = cred.uid == 0;
bool is_zygote = check_zygote(cred.pid);
bool is_client = verify_client(cred.pid);
if (!is_root && !is_zygote && !is_client)
goto shortcut;
req_code = read_int(client);
@@ -83,13 +98,12 @@ static void handle_request(int client) {
// Check client permissions
switch (req_code) {
case MAGISKHIDE:
case POST_FS_DATA:
case LATE_START:
case BOOT_COMPLETE:
case SQLITE_CMD:
case GET_PATH:
if (cred.uid != 0) {
if (!is_root) {
write_int(client, ROOT_REQUIRED);
goto shortcut;
}
@@ -100,6 +114,12 @@ static void handle_request(int client) {
goto shortcut;
}
break;
case MAGISKHIDE: // accept hide request from zygote
if (!is_root && !is_zygote) {
write_int(client, ROOT_REQUIRED);
goto shortcut;
}
break;
}
// Simple requests