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Prevent race conditions in connect_companion

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topjohnwu 2021-11-12 01:55:55 -08:00
parent 56988944b5
commit 421277d730
1 changed files with 4 additions and 0 deletions
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4
native/jni/zygisk/entry.cpp
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@ -190,10 +190,13 @@ static bool get_exe(int pid, char *buf, size_t sz) {
return xreadlink(buf, buf, sz) > 0;
}
static pthread_mutex_t zygiskd_lock = PTHREAD_MUTEX_INITIALIZER;
static int zygiskd_sockets[] = { -1, -1 };
#define zygiskd_socket zygiskd_sockets[is_64_bit]
static void connect_companion(int client, bool is_64_bit) {
mutex_guard g(zygiskd_lock);
if (zygiskd_socket >= 0) {
// Make sure the socket is still valid
pollfd pfd = { zygiskd_socket, 0, 0 };
@ -222,6 +225,7 @@ static void connect_companion(int client, bool is_64_bit) {
send_fds(zygiskd_socket, module_fds.data(), module_fds.size());
// Wait for ack
if (read_int(zygiskd_socket) != 0) {
LOGE("zygiskd startup error\n");
return;
}
}