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 pointing #! script interpreter to self doesn't recurse. */
^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 <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <sys/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int main(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	if (unshare(CLONE_NEWNS) == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		if (errno == ENOSYS || errno == EPERM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 			fprintf(stderr, "error: unshare, errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 			return 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		fprintf(stderr, "error: unshare, errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		fprintf(stderr, "error: mount '/', errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	/* Require "exec" filesystem. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	if (mount(NULL, "/tmp", "ramfs", 0, NULL) == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		fprintf(stderr, "error: mount ramfs, errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define FILENAME "/tmp/1"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	int fd = creat(FILENAME, 0700);
^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: creat, 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) #define S "#!" FILENAME "\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	if (write(fd, S, strlen(S)) != strlen(S)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		fprintf(stderr, "error: write, errno %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	int rv = execve(FILENAME, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	if (rv == -1 && errno == ELOOP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	fprintf(stderr, "error: execve, rv %d, errno %d\n", rv, errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }