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Detect UID from data directories

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topjohnwu
2019-06-03 23:32:49 -07:00
parent 80d834fb55
commit 4fcdcd9a8a
3 changed files with 15 additions and 44 deletions
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52
native/jni/magiskhide/proc_monitor.cpp
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@@ -76,50 +76,20 @@ static inline long xptrace(int request, pid_t pid, void *addr = nullptr, intptr_
return xptrace(request, pid, addr, reinterpret_cast<void *>(data));
}
static bool parse_packages_xml(string_view s) {
if (!str_starts(s, "<package "))
return true;
/* <package key1="value1" key2="value2"....> */
char *start = (char *) s.data();
start[s.length() - 1] = '\0'; /* Remove trailing '>' */
start += 9; /* Skip '<package ' */
string_view pkg;
for (char *tok = start; *tok;) {
char *eql = strchr(tok, '=');
if (eql == nullptr)
break;
*eql = '\0'; /* Terminate '=' */
string_view key(tok, eql - tok);
eql += 2; /* Skip '="' */
tok = strchr(eql, '\"'); /* Find closing '"' */
*tok = '\0';
string_view value(eql, tok - eql);
tok += 2;
if (key == "name") {
for (auto &hide : hide_set) {
if (hide.first == value) {
pkg = hide.first;
break;
}
}
if (pkg.empty())
return true;
} else if (key == "userId" || key == "sharedUserId") {
int uid = parse_int(value);
for (auto &hide : hide_set) {
if (hide.first == pkg)
uid_proc_map[uid].emplace_back(hide.second);
}
}
}
return true;
}
void update_uid_map() {
MutexGuard lock(monitor_lock);
uid_proc_map.clear();
file_readline("/data/system/packages.xml", parse_packages_xml, true);
string data_path(APP_DATA_DIR);
data_path += "/0/";
size_t len = data_path.length();
struct stat st;
for (auto &hide : hide_set) {
data_path.erase(data_path.begin() + len, data_path.end());
data_path += hide.first;
if (stat(data_path.data(), &st))
continue;
uid_proc_map[st.st_uid].emplace_back(hide.second);
}
}
static void check_zygote() {