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Minor MagiskHide adjustments

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- Fail fast on unsupported systems
- Show proper fail message on unsupported systems
- inotify_fd shall be swapped out before closing to prevent
  the proc_monitor thread to read from incomplete inotify fd
This commit is contained in:
topjohnwu
2019-02-14 04:08:05 -05:00
parent d584360de2
commit 99db0672b4
4 changed files with 34 additions and 42 deletions
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47
native/jni/magiskhide/proc_monitor.cpp
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@@ -33,10 +33,6 @@ extern char *system_block, *vendor_block, *data_block;
static int inotify_fd = -1;
#define EVENT_SIZE sizeof(struct inotify_event)
#define EVENT_BUF_LEN (1024 * (EVENT_SIZE + 16))
#define __ALIGN_EVENT __attribute__ ((aligned(__alignof__(struct inotify_event))))
// Workaround for the lack of pthread_cancel
static void term_thread(int) {
LOGD("proc_monitor: running cleanup\n");
@@ -208,7 +204,7 @@ static char *append_path(char *eof, const char *name) {
}
#define DATA_APP "/data/app"
static int new_inotify;
static void find_apks(char *path, char *eof) {
DIR *dir = opendir(path);
if (dir == nullptr)
@@ -231,7 +227,7 @@ static void find_apks(char *path, char *eof) {
if (s == path + sizeof(DATA_APP)) {
*dash = '-';
append_path(eof, entry->d_name);
xinotify_add_watch(inotify_fd, path, IN_OPEN | IN_DELETE);
xinotify_add_watch(new_inotify, path, IN_OPEN | IN_DELETE);
*eof = '\0';
break;
}
@@ -247,23 +243,27 @@ static void find_apks(char *path, char *eof) {
void update_inotify_mask() {
char buf[4096];
if (inotify_fd >= 0)
close(inotify_fd);
inotify_fd = inotify_init();
if (inotify_fd < 0) {
new_inotify = inotify_init();
if (new_inotify < 0) {
LOGE("proc_monitor: Cannot initialize inotify: %s\n", strerror(errno));
term_thread(TERM_THREAD);
}
LOGI("proc_monitor: Updating APK list\n");
LOGI("proc_monitor: Updating inotify list\n");
strcpy(buf, DATA_APP);
pthread_mutex_lock(&list_lock);
find_apks(buf, buf + sizeof(DATA_APP) - 1);
pthread_mutex_unlock(&list_lock);
// Add /data/app itself to the watch list to detect app (un)installations/updates
xinotify_add_watch(inotify_fd, DATA_APP, IN_CLOSE_WRITE | IN_MOVED_TO | IN_DELETE);
xinotify_add_watch(new_inotify, DATA_APP, IN_CLOSE_WRITE | IN_MOVED_TO | IN_DELETE);
if (inotify_fd >= 0) {
// Swap and close old fd
int tmp = inotify_fd;
inotify_fd = new_inotify;
close(tmp);
}
}
void proc_monitor() {
@@ -278,25 +278,13 @@ void proc_monitor() {
act.sa_handler = term_thread;
sigaction(TERM_THREAD, &act, nullptr);
if (access("/proc/1/ns/mnt", F_OK) != 0) {
LOGE("proc_monitor: Your kernel doesn't support mount namespace :(\n");
term_thread(TERM_THREAD);
}
// Read inotify events
struct inotify_event *event;
ssize_t len;
char *p;
char buffer[EVENT_BUF_LEN] __ALIGN_EVENT;
for (;;) {
len = read(inotify_fd, buffer, EVENT_BUF_LEN);
if (len == -1) {
PLOGE("proc_monitor: read inotify");
sleep(1);
continue;
}
for (p = buffer; p < buffer + len; ) {
char buf[4096];
while ((len = read(inotify_fd, buf, sizeof(buf))) >= 0) {
for (p = buf; p < buf + len; ) {
event = (struct inotify_event *)p;
if (event->mask & IN_OPEN) {
@@ -314,7 +302,8 @@ void proc_monitor() {
break;
}
p += EVENT_SIZE + event->len;
p += sizeof(*event) + event->len;
}
}
PLOGE("proc_monitor: read inotify");
}