Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #define _GNU_SOURCE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <sys/ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <sys/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/android/binder.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/android/binderfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) int main(int argc, char *argv[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	int fd, ret, saved_errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	struct binderfs_device device = { 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	ret = unshare(CLONE_NEWNS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		fprintf(stderr, "%s - Failed to unshare mount namespace\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 			strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		fprintf(stderr, "%s - Failed to mount / as private\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 			strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	ret = mkdir("/dev/binderfs", 0755);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	if (ret < 0 && errno != EEXIST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		fprintf(stderr, "%s - Failed to create binderfs mountpoint\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 			strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	ret = mount(NULL, "/dev/binderfs", "binder", 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		fprintf(stderr, "%s - Failed to mount binderfs\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 			strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	memcpy(device.name, "my-binder", strlen("my-binder"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	fd = open("/dev/binderfs/binder-control", O_RDONLY | O_CLOEXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	if (fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		fprintf(stderr, "%s - Failed to open binder-control device\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 			strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	ret = ioctl(fd, BINDER_CTL_ADD, &device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	saved_errno = errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	errno = saved_errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		fprintf(stderr, "%s - Failed to allocate new binder device\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 			strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	printf("Allocated new binder device with major %d, minor %d, and name %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	       device.major, device.minor, device.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	ret = unlink("/dev/binderfs/my-binder");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 		fprintf(stderr, "%s - Failed to delete binder device\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 			strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 		exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	/* Cleanup happens when the mount namespace dies. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	exit(EXIT_SUCCESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }