Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * Copyright (c) 2019 Alexey Dobriyan <adobriyan@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Permission to use, copy, modify, and distribute this software for any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * purpose with or without fee is hereby granted, provided that the above
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * copyright notice and this permission notice appear in all copies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /* Test that open(O_TMPFILE), linkat() doesn't screw accounting. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <sys/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) int main(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	if (unshare(CLONE_NEWNS) == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		if (errno == ENOSYS || errno == EPERM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 			fprintf(stderr, "error: unshare, errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 			return 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		fprintf(stderr, "error: unshare, errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		fprintf(stderr, "error: mount '/', errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	/* Our heroes: 1 root inode, 1 O_TMPFILE inode, 1 permanent inode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	if (mount(NULL, "/tmp", "tmpfs", 0, "nr_inodes=3") == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		fprintf(stderr, "error: mount tmpfs, errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	fd = openat(AT_FDCWD, "/tmp", O_WRONLY|O_TMPFILE, 0600);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	if (fd == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		fprintf(stderr, "error: open 1, errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	if (linkat(fd, "", AT_FDCWD, "/tmp/1", AT_EMPTY_PATH) == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		fprintf(stderr, "error: linkat, errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	fd = openat(AT_FDCWD, "/tmp", O_WRONLY|O_TMPFILE, 0600);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	if (fd == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 		fprintf(stderr, "error: open 2, errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }