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) #define _GNU_SOURCE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <sys/ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <sys/prctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <sys/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define pr_err(fmt, ...) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 			fprintf(stderr, "%s:%d:" fmt ": %m\n", \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 				__func__, __LINE__, ##__VA_ARGS__); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 			1; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 		})
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define NSIO	0xb7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define NS_GET_USERNS   _IO(NSIO, 0x1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define NS_GET_PARENT   _IO(NSIO, 0x2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define __stack_aligned__	__attribute__((aligned(16)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct cr_clone_arg {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	char stack[128] __stack_aligned__;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	char stack_ptr[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static int child(void *args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	prctl(PR_SET_PDEATHSIG, SIGKILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	while (1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		sleep(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	exit(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) int main(int argc, char *argv[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	char *ns_strs[] = {"pid", "user"};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	char path[] = "/proc/0123456789/ns/pid";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	struct cr_clone_arg ca;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	struct stat st1, st2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	int ns, pns, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	pid_t pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	pid = clone(child, ca.stack_ptr, CLONE_NEWUSER | CLONE_NEWPID | SIGCHLD, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	if (pid < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		return pr_err("clone");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	for (i = 0; i < 2; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		snprintf(path, sizeof(path), "/proc/%d/ns/%s", pid, ns_strs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		ns = open(path, O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		if (ns < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 			return pr_err("Unable to open %s", path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		pns = ioctl(ns, NS_GET_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 		if (pns < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 			return pr_err("Unable to get a parent pidns");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 		snprintf(path, sizeof(path), "/proc/self/ns/%s", ns_strs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		if (stat(path, &st2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 			return pr_err("Unable to stat %s", path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		if (fstat(pns, &st1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 			return pr_err("Unable to stat the parent pidns");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 		if (st1.st_ino != st2.st_ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 			return pr_err("NS_GET_PARENT returned a wrong namespace");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 		if (ioctl(pns, NS_GET_PARENT) >= 0 || errno != EPERM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 			return pr_err("Don't get EPERM");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	kill(pid, SIGKILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	wait(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }