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/*
* Check decoding of NS_* commands of ioctl syscall.
*
* Copyright (c) 2017 Nikolay Marchuk <marchuk.nikolay.a@gmail.com>
* Copyright (c) 2017-2018 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <fcntl.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <unistd.h>
#include "nsfs.h"
#ifndef CLONE_NEWUSER
# define CLONE_NEWUSER 0x10000000
#endif
static void
test_no_namespace(void)
{
ioctl(-1, NS_GET_USERNS);
printf("ioctl(-1, NS_GET_USERNS) = -1 EBADF (%m)\n");
ioctl(-1, NS_GET_PARENT);
printf("ioctl(-1, NS_GET_PARENT) = -1 EBADF (%m)\n");
ioctl(-1, NS_GET_NSTYPE);
printf("ioctl(-1, NS_GET_NSTYPE) = -1 EBADF (%m)\n");
ioctl(-1, NS_GET_OWNER_UID, NULL);
printf("ioctl(-1, NS_GET_OWNER_UID, NULL) = -1 EBADF (%m)\n");
}
static void
test_clone(pid_t pid)
{
char path[sizeof("/proc/%d/ns/user") + sizeof(int)*3];
snprintf(path, sizeof(path), "/proc/%d/ns/user", pid);
int ns_fd = open(path, O_RDONLY);
if (ns_fd == -1)
perror_msg_and_skip("open: %s", path);
int userns_fd = ioctl(ns_fd, NS_GET_USERNS);
printf("ioctl(%d, NS_GET_USERNS) = %s\n", ns_fd, sprintrc(userns_fd));
int parent_ns_fd = ioctl(userns_fd, NS_GET_PARENT);
printf("ioctl(%d, NS_GET_PARENT) = %s\n",
userns_fd, sprintrc(parent_ns_fd));
int nstype = ioctl(userns_fd, NS_GET_NSTYPE);
if (nstype == -1) {
printf("ioctl(%d, NS_GET_NSTYPE) = %s\n",
userns_fd, sprintrc(nstype));
} else {
printf("ioctl(%d, NS_GET_NSTYPE) = %d (CLONE_NEWUSER)\n",
userns_fd, nstype);
}
TAIL_ALLOC_OBJECT_CONST_PTR(unsigned int, uid);
int rc = ioctl(userns_fd, NS_GET_OWNER_UID, uid);
if (rc == -1) {
printf("ioctl(%d, NS_GET_OWNER_UID, %p) = %s\n",
userns_fd, uid, sprintrc(rc));
} else {
printf("ioctl(%d, NS_GET_OWNER_UID, [%u]) = %d\n",
userns_fd, *uid, rc);
}
}
static int
child(void *arg)
{
int *pipefd = (int *) arg;
close(pipefd[1]);
/* Wait for EOF from pipe. */
if (read(pipefd[0], &pipefd[1], 1))
perror_msg_and_fail("read");
return 0;
}
#ifdef IA64
extern int __clone2(int (*)(void *), void *, size_t, int, void *, ...);
# define clone(fn, child_stack, flags, arg) \
__clone2(fn, child_stack, get_page_size() / 2, flags, arg)
#endif
static void
test_user_namespace(void)
{
pid_t pid;
int pipefd[2];
int status;
if (pipe(pipefd))
perror_msg_and_fail("pipe");
pid = clone(child, tail_alloc(get_page_size() / 2),
CLONE_NEWUSER | CLONE_UNTRACED | SIGCHLD, pipefd);
if (pid == -1) {
perror("clone");
return;
}
close(pipefd[0]);
test_clone(pid);
close(pipefd[1]);
if (wait(&status) != pid) {
perror_msg_and_fail("wait");
} else if (status != 0) {
error_msg_and_fail("unexpected child exit status %d", status);
}
}
int
main(void)
{
test_no_namespace();
test_user_namespace();
puts("+++ exited with 0 +++");
return 0;
}
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