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143 lines
3.4 KiB
143 lines
3.4 KiB
/*
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* Copyright (c) Huawei Technologies Co., Ltd., 2015
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*/
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/*
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* Verify that:
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* A process created via fork(2) or clone(2) without the
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* CLONE_NEWUSER flag is a member of the same user namespace as its
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* parent.
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* When unshare an user namespace, the calling process is moved into
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* a new user namespace which is not shared with any previously
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* existing process.
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*/
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#define _GNU_SOURCE
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#include <sys/wait.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include "userns_helper.h"
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#include "test.h"
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char *TCID = "user_namespace5";
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int TST_TOTAL = 1;
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static void cleanup(void)
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{
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tst_rmdir();
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}
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/*
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* child_fn1() - Inside a new user namespace
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*/
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static int child_fn1(void)
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{
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TST_SAFE_CHECKPOINT_WAIT(NULL, 0);
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return 0;
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}
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static unsigned int getusernsidbypid(int pid)
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{
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char path[BUFSIZ];
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char userid[BUFSIZ];
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unsigned int id = 0;
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sprintf(path, "/proc/%d/ns/user", pid);
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if (readlink(path, userid, BUFSIZ) == -1)
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tst_resm(TFAIL | TERRNO, "readlink failure.");
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if (sscanf(userid, "user:[%u]", &id) != 1)
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tst_resm(TFAIL, "sscanf failure.");
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return id;
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}
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static void test_userns_id(void)
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{
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int cpid1, cpid2, cpid3;
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unsigned int parentuserns, cpid1userns, cpid2userns, newparentuserns;
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parentuserns = getusernsidbypid(getpid());
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cpid1 = ltp_clone_quick(SIGCHLD, (void *)child_fn1,
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NULL);
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if (cpid1 < 0)
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tst_brkm(TBROK | TERRNO, cleanup, "clone failed");
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cpid1userns = getusernsidbypid(cpid1);
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TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
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/* A process created via fork(2) or clone(2) without the
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CLONE_NEWUSER flag is a member of the same user namespace as its
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parent.*/
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if (parentuserns != cpid1userns)
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tst_resm(TFAIL, "userns:parent should be equal to cpid1");
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cpid2 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
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(void *)child_fn1, NULL);
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if (cpid2 < 0)
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tst_brkm(TBROK | TERRNO, cleanup, "clone failed");
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cpid2userns = getusernsidbypid(cpid2);
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TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
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if (parentuserns == cpid2userns)
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tst_resm(TFAIL, "userns:parent should be not equal to cpid2");
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switch (cpid3 = fork()) {
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case -1:
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tst_brkm(TBROK | TERRNO, cleanup, "fork");
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case 0:
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if (unshare(CLONE_NEWUSER) == -1) {
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printf("parent pid unshare failure: (%d) %s",
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errno, strerror(errno));
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exit(1);
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}
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newparentuserns = getusernsidbypid(getpid());
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/* When unshare an user namespace, the calling process
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is moved into a new user namespace which is not shared
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with any previously existing process.*/
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if (parentuserns == newparentuserns)
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exit(1);
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exit(0);
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}
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tst_record_childstatus(cleanup, cpid1);
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tst_record_childstatus(cleanup, cpid2);
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tst_record_childstatus(cleanup, cpid3);
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}
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static void setup(void)
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{
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check_newuser();
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tst_tmpdir();
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TST_CHECKPOINT_INIT(NULL);
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}
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int main(int argc, char *argv[])
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{
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int lc;
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tst_parse_opts(argc, argv, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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test_userns_id();
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}
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cleanup();
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tst_exit();
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}
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