CVE-2026-43445 Linux内核e1000驱动DMA资源泄漏漏洞

/* * PoC Concept: Demonstration of the off-by-one logic error in e1000/e1000e driver. * This snippet simulates the flawed DMA cleanup logic. */ #include <stdio.h> void vulnerable_cleanup(int mapped_count) { // Vulnerable logic: Decrementing count before the loop // If mapped_count is 1, count becomes 0, loop doesn't run, 1 buffer leaks. int count = mapped_count - 1; printf("Buffers to clean: %d\n", mapped_count); while (count >= 0) { // dma_unmap_single(dev, buffer[count], size, DMA_TO_DEVICE); printf("Unmapping buffer index %d\n", count); count--; } printf("Leaked buffers: %d\n", mapped_count - (mapped_count - 1)); // Simplified visualization } int main() { // Scenario: 1 buffer was mapped successfully, then an error occurred. int mapped_buffers = 1; printf("Simulating DMA error with %d mapped buffer.\n", mapped_buffers); vulnerable_cleanup(mapped_buffers); return 0; }