99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2001
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*/
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/*
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* Test Name: chmod05
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*
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* Test Description:
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* Verify that, chmod(2) will succeed to change the mode of a directory
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* but fails to set the setgid bit on it if invoked by non-root (uid != 0)
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* process with the following constraints,
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* - the process is the owner of the directory.
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* - the effective group ID or one of the supplementary group ID's of the
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* process is not equal to the group ID of the directory.
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*
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* Expected Result:
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* chmod() should return value 0 on success and though succeeds to change
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* the mode of a directory but fails to set setgid bit on it.
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*
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*/
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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <signal.h>
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#include <unistd.h>
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#include <grp.h>
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#include <pwd.h>
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#include "tst_test.h"
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#define MODE_RWX (mode_t)(S_IRWXU | S_IRWXG | S_IRWXO)
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#define DIR_MODE (mode_t)(S_ISVTX | S_ISGID | S_IFDIR)
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#define PERMS (mode_t)(MODE_RWX | DIR_MODE)
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#define TESTDIR "testdir"
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static void test_chmod(void)
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{
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struct stat stat_buf;
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mode_t dir_mode;
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TEST(chmod(TESTDIR, PERMS));
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if (TST_RET == -1) {
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tst_res(TFAIL, "chmod(%s, %#o) failed", TESTDIR, PERMS);
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return;
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}
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SAFE_STAT(TESTDIR, &stat_buf);
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dir_mode = stat_buf.st_mode;
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if ((PERMS & ~S_ISGID) != dir_mode) {
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tst_res(TFAIL, "%s: Incorrect modes 0%03o, "
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"Expected 0%03o", TESTDIR, dir_mode,
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PERMS & ~S_ISGID);
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} else {
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tst_res(TPASS, "Functionality of chmod(%s, %#o) successful",
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TESTDIR, PERMS);
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}
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}
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static void setup(void)
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{
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struct passwd *nobody_u;
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struct group *bin_gr;
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nobody_u = SAFE_GETPWNAM("nobody");
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bin_gr = SAFE_GETGRNAM("bin");
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/*
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* Create a test directory under temporary directory with specified
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* mode permissions and change the gid of test directory to nobody's
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* gid.
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*/
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SAFE_MKDIR(TESTDIR, MODE_RWX);
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if (setgroups(1, &nobody_u->pw_gid) == -1)
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tst_brk(TBROK | TERRNO, "setgroups to nobody's gid failed");
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SAFE_CHOWN(TESTDIR, nobody_u->pw_uid, bin_gr->gr_gid);
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/* change to nobody:nobody */
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SAFE_SETEGID(nobody_u->pw_gid);
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SAFE_SETEUID(nobody_u->pw_uid);
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}
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static struct tst_test test = {
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.needs_root = 1,
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.needs_tmpdir = 1,
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.setup = setup,
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.test_all = test_chmod,
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};
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