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Swap out inotify fd before adding watch targets

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topjohnwu 2019-02-18 03:18:11 -05:00
parent 31a27838f5
commit 50ff11405f
1 changed files with 9 additions and 5 deletions
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14
native/jni/magiskhide/proc_monitor.cpp
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@ -193,6 +193,7 @@ static int xinotify_add_watch(int fd, const char* path, uint32_t mask) {
static int new_inotify;
static const string_view APK_EXT(".apk");
static vector<string> hide_apks;
static bool parse_packages_xml(string_view &s) {
if (!str_starts(s, "<package "))
@ -212,7 +213,7 @@ static bool parse_packages_xml(string_view &s) {
} else if (strcmp(key, "codePath") == 0) {
if (ends_with(value_view, APK_EXT)) {
// Directly add to inotify list
xinotify_add_watch(new_inotify, value, IN_OPEN);
hide_apks.emplace_back(value);
} else {
DIR *dir = opendir(value);
if (dir == nullptr)
@ -222,7 +223,7 @@ static bool parse_packages_xml(string_view &s) {
if (ends_with(entry->d_name, APK_EXT)) {
strcpy(value + value_view.length(), "/");
strcpy(value + value_view.length() + 1, entry->d_name);
xinotify_add_watch(new_inotify, value, IN_OPEN);
hide_apks.emplace_back(value);
break;
}
}
@ -244,19 +245,22 @@ void update_inotify_mask() {
fcntl(new_inotify, F_SETFD, FD_CLOEXEC);
LOGD("proc_monitor: Updating inotify list\n");
hide_apks.clear();
{
MutexGuard lock(list_lock);
hide_uid.clear();
file_readline("/data/system/packages.xml", parse_packages_xml, true);
}
// Add /data/system to monitor /data/system/packages.xml
xinotify_add_watch(new_inotify, "/data/system", IN_CLOSE_WRITE);
// Swap out and close old inotify_fd
int tmp = inotify_fd;
inotify_fd = new_inotify;
if (tmp >= 0)
close(tmp);
for (auto apk : hide_apks)
xinotify_add_watch(inotify_fd, apk.data(), IN_OPEN);
xinotify_add_watch(inotify_fd, "/data/system", IN_CLOSE_WRITE);
}
void proc_monitor() {