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