117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) Huawei Technologies Co., Ltd., 2015
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* Copyright (C) 2022 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
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*/
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/*\
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* [Description]
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*
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* Verify that if 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 parent.
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*
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* When unshare an user namespace, the calling process is moved into a new user
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* namespace which is not shared with any previously existing process.
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include "tst_test.h"
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#include "common.h"
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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_CHECKPOINT_WAIT(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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SAFE_READLINK(path, userid, BUFSIZ);
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if (sscanf(userid, "user:[%u]", &id) < 0)
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tst_brk(TBROK | TERRNO, "sscanf failure");
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return id;
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}
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static void run(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, NULL);
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if (cpid1 < 0)
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tst_brk(TBROK | TTERRNO, "clone failed");
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cpid1userns = getusernsidbypid(cpid1);
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TST_CHECKPOINT_WAKE(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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*/
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if (parentuserns != cpid1userns)
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tst_res(TFAIL, "userns:parent should be equal to cpid1");
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else
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tst_res(TPASS, "userns:parent is equal to cpid1");
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cpid2 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD, (void *)child_fn1, NULL);
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if (cpid2 < 0)
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tst_brk(TBROK | TTERRNO, "clone failed");
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cpid2userns = getusernsidbypid(cpid2);
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TST_CHECKPOINT_WAKE(0);
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if (parentuserns == cpid2userns)
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tst_res(TFAIL, "userns:parent should be not equal to cpid2");
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else
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tst_res(TPASS, "userns:parent is not equal to cpid2");
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cpid3 = SAFE_FORK();
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if (!cpid3) {
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SAFE_UNSHARE(CLONE_NEWUSER);
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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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*/
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if (parentuserns == newparentuserns)
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tst_res(TFAIL, "unshared namespaces with same id");
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else
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tst_res(TPASS, "unshared namespaces with different id");
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}
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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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}
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static struct tst_test test = {
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.setup = setup,
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.test_all = run,
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.needs_root = 1,
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.forks_child = 1,
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.needs_checkpoints = 1,
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.needs_kconfigs = (const char *[]) {
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"CONFIG_USER_NS",
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NULL,
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},
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};
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