83 строки
1.9 KiB
C
83 строки
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#define _GNU_SOURCE
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <sched.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <linux/android/binder.h>
|
|
#include <linux/android/binderfs.h>
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int fd, ret, saved_errno;
|
|
struct binderfs_device device = { 0 };
|
|
|
|
ret = unshare(CLONE_NEWNS);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "%s - Failed to unshare mount namespace\n",
|
|
strerror(errno));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "%s - Failed to mount / as private\n",
|
|
strerror(errno));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
ret = mkdir("/dev/binderfs", 0755);
|
|
if (ret < 0 && errno != EEXIST) {
|
|
fprintf(stderr, "%s - Failed to create binderfs mountpoint\n",
|
|
strerror(errno));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
ret = mount(NULL, "/dev/binderfs", "binder", 0, 0);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "%s - Failed to mount binderfs\n",
|
|
strerror(errno));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
memcpy(device.name, "my-binder", strlen("my-binder"));
|
|
|
|
fd = open("/dev/binderfs/binder-control", O_RDONLY | O_CLOEXEC);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "%s - Failed to open binder-control device\n",
|
|
strerror(errno));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
ret = ioctl(fd, BINDER_CTL_ADD, &device);
|
|
saved_errno = errno;
|
|
close(fd);
|
|
errno = saved_errno;
|
|
if (ret < 0) {
|
|
fprintf(stderr, "%s - Failed to allocate new binder device\n",
|
|
strerror(errno));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
printf("Allocated new binder device with major %d, minor %d, and name %s\n",
|
|
device.major, device.minor, device.name);
|
|
|
|
ret = unlink("/dev/binderfs/my-binder");
|
|
if (ret < 0) {
|
|
fprintf(stderr, "%s - Failed to delete binder device\n",
|
|
strerror(errno));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* Cleanup happens when the mount namespace dies. */
|
|
exit(EXIT_SUCCESS);
|
|
}
|