146 lines
4.2 KiB
C
146 lines
4.2 KiB
C
/*
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* Check decoding of NS_* commands of ioctl syscall.
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*
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* Copyright (c) 2017 Nikolay Marchuk <marchuk.nikolay.a@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <fcntl.h>
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#include <sched.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "nsfs.h"
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#ifndef CLONE_NEWUSER
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# define CLONE_NEWUSER 0x10000000
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#endif
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static void
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test_no_namespace(void)
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{
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ioctl(-1, NS_GET_USERNS);
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printf("ioctl(-1, NS_GET_USERNS) = -1 EBADF (%m)\n");
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ioctl(-1, NS_GET_PARENT);
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printf("ioctl(-1, NS_GET_PARENT) = -1 EBADF (%m)\n");
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ioctl(-1, NS_GET_NSTYPE);
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printf("ioctl(-1, NS_GET_NSTYPE) = -1 EBADF (%m)\n");
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ioctl(-1, NS_GET_OWNER_UID, NULL);
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printf("ioctl(-1, NS_GET_OWNER_UID, NULL) = -1 EBADF (%m)\n");
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}
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static void
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test_clone(pid_t pid)
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{
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char path[sizeof("/proc/%d/ns/user") + sizeof(int)*3];
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snprintf(path, sizeof(path), "/proc/%d/ns/user", pid);
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int ns_fd = open(path, O_RDONLY);
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if (ns_fd == -1)
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perror_msg_and_skip("open: %s", path);
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int userns_fd = ioctl(ns_fd, NS_GET_USERNS);
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printf("ioctl(%d, NS_GET_USERNS) = %s\n", ns_fd, sprintrc(userns_fd));
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int parent_ns_fd = ioctl(userns_fd, NS_GET_PARENT);
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printf("ioctl(%d, NS_GET_PARENT) = %s\n",
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userns_fd, sprintrc(parent_ns_fd));
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int nstype = ioctl(userns_fd, NS_GET_NSTYPE);
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if (nstype == -1) {
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printf("ioctl(%d, NS_GET_NSTYPE) = %s\n",
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userns_fd, sprintrc(nstype));
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} else {
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printf("ioctl(%d, NS_GET_NSTYPE) = %d (CLONE_NEWUSER)\n",
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userns_fd, nstype);
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}
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TAIL_ALLOC_OBJECT_CONST_PTR(unsigned int, uid);
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int rc = ioctl(userns_fd, NS_GET_OWNER_UID, uid);
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if (rc == -1) {
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printf("ioctl(%d, NS_GET_OWNER_UID, %p) = %s\n",
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userns_fd, uid, sprintrc(rc));
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} else {
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printf("ioctl(%d, NS_GET_OWNER_UID, [%u]) = %d\n",
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userns_fd, *uid, rc);
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}
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}
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static int
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child(void *arg)
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{
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int *pipefd = (int *) arg;
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close(pipefd[1]);
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/* Wait for EOF from pipe. */
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if (read(pipefd[0], &pipefd[1], 1))
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perror_msg_and_fail("read");
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return 0;
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}
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#ifdef IA64
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extern int __clone2(int (*)(void *), void *, size_t, int, void *, ...);
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# define clone(fn, child_stack, flags, arg) \
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__clone2(fn, child_stack, get_page_size() / 2, flags, arg)
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#endif
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static void
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test_user_namespace(void)
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{
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pid_t pid;
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int pipefd[2];
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int status;
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if (pipe(pipefd))
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perror_msg_and_fail("pipe");
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pid = clone(child, tail_alloc(get_page_size() / 2),
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CLONE_NEWUSER | CLONE_UNTRACED | SIGCHLD, pipefd);
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if (pid == -1) {
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perror("clone");
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return;
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}
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close(pipefd[0]);
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test_clone(pid);
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close(pipefd[1]);
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if (wait(&status) != pid) {
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perror_msg_and_fail("wait");
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} else if (status != 0) {
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error_msg_and_fail("unexpected child exit status %d", status);
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}
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}
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int
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main(void)
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{
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test_no_namespace();
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test_user_namespace();
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puts("+++ exited with 0 +++");
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return 0;
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}
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