/*
* Copyright (c) Huawei Technologies Co., Ltd., 2015
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*/
/*
* Verify that:
* If a namespace isn't another namespace's ancestor, the process in
* first namespace does not have the CAP_SYS_ADMIN capability in the
* second namespace and the setns() call fails.
*/
#define _GNU_SOURCE
#include <sys/wait.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "userns_helper.h"
#include "test.h"
char *TCID = "user_namespace4";
int TST_TOTAL = 1;
static void setup(void)
{
check_newuser();
ltp_syscall(__NR_setns, -1, 0);
tst_tmpdir();
TST_CHECKPOINT_INIT(NULL);
}
static void cleanup(void)
{
tst_rmdir();
}
static int child_fn1(void *arg LTP_ATTRIBUTE_UNUSED)
{
TST_SAFE_CHECKPOINT_WAIT(NULL, 0);
return 0;
}
static int child_fn2(void *arg)
{
int exit_val = 0;
int ret;
ret = ltp_syscall(__NR_setns, ((long)arg), CLONE_NEWUSER);
if (ret != -1) {
printf("child2 setns() unexpected success\n");
exit_val = 1;
} else if (errno != EPERM) {
printf("child2 setns() unexpected error: (%d) %s\n",
errno, strerror(errno));
exit_val = 1;
}
TST_SAFE_CHECKPOINT_WAIT(NULL, 1);
return exit_val;
}
static void test_cap_sys_admin(void)
{
pid_t cpid1, cpid2, cpid3;
char path[BUFSIZ];
int fd;
/* child 1 */
cpid1 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
(void *)child_fn1, NULL);
if (cpid1 < 0)
tst_brkm(TBROK | TERRNO, cleanup, "clone failed");
/* child 2 */
sprintf(path, "/proc/%d/ns/user", cpid1);
fd = SAFE_OPEN(cleanup, path, O_RDONLY, 0644);
cpid2 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
(void *)child_fn2, (void *)((long)fd));
if (cpid2 < 0)
tst_brkm(TBROK | TERRNO, cleanup, "clone failed");
/* child 3 - throw-away process changing ns to child1 */
switch (cpid3 = fork()) {
case -1:
tst_brkm(TBROK | TERRNO, cleanup, "fork");
case 0:
if (ltp_syscall(__NR_setns, fd, CLONE_NEWUSER) == -1) {
printf("parent pid setns failure: (%d) %s",
errno, strerror(errno));
exit(1);
}
exit(0);
}
TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
TST_SAFE_CHECKPOINT_WAKE(cleanup, 1);
tst_record_childstatus(cleanup, cpid1);
tst_record_childstatus(cleanup, cpid2);
tst_record_childstatus(cleanup, cpid3);
SAFE_CLOSE(cleanup, fd);
}
int main(int argc, char *argv[])
{
int lc;
setup();
tst_parse_opts(argc, argv, NULL, NULL);
for (lc = 0; TEST_LOOPING(lc); lc++) {
tst_count = 0;
test_cap_sys_admin();
}
cleanup();
tst_exit();
}