134 lines
2.8 KiB
C
134 lines
2.8 KiB
C
/*
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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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* The kernel imposes a limit of at least 32 nested levels on user namespaces.
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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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#define MAXNEST 32
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char *TCID = "userns07";
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int TST_TOTAL = 1;
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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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static void cleanup(void)
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{
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tst_rmdir();
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}
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static int child_fn1(void *arg)
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{
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pid_t cpid1;
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long level = (long)arg;
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int status;
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int parentuid;
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int parentgid;
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TST_SAFE_CHECKPOINT_WAIT(NULL, 0);
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if (level == MAXNEST)
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return 0;
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cpid1 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
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(void *)child_fn1, (void *)(level + 1));
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if (cpid1 < 0) {
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printf("level %ld:unexpected error: (%d) %s\n",
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level, errno, strerror(errno));
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return 1;
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}
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parentuid = geteuid();
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parentgid = getegid();
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updatemap(cpid1, UID_MAP, 0, parentuid, NULL);
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updatemap(cpid1, GID_MAP, 0, parentgid, NULL);
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TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
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if (waitpid(cpid1, &status, 0) == -1)
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return 1;
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if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
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printf("child exited abnormally\n");
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return 1;
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} else if (WIFSIGNALED(status)) {
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printf("child was killed with signal = %d", WTERMSIG(status));
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return 1;
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}
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return 0;
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}
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static void test_max_nest(void)
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{
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pid_t cpid1;
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int parentuid;
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int parentgid;
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int fd;
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char path[BUFSIZ];
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cpid1 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
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(void *)child_fn1, (void *)0);
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if (cpid1 < 0)
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tst_brkm(TBROK | TERRNO, cleanup, "clone failed");
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parentuid = geteuid();
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parentgid = getegid();
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if (access("/proc/self/setgroups", F_OK) == 0) {
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sprintf(path, "/proc/%d/setgroups", cpid1);
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fd = SAFE_OPEN(cleanup, path, O_WRONLY, 0644);
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SAFE_WRITE(cleanup, 1, fd, "deny", 4);
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SAFE_CLOSE(cleanup, fd);
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}
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updatemap(cpid1, UID_MAP, 0, parentuid, cleanup);
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updatemap(cpid1, GID_MAP, 0, parentgid, cleanup);
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TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
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tst_record_childstatus(cleanup, cpid1);
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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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setup();
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tst_parse_opts(argc, argv, NULL, NULL);
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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test_max_nest();
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}
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cleanup();
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tst_exit();
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}
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