104 lines
2.4 KiB
C
104 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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* 07/2001 Ported by Wayne Boyer
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*/
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/*\
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* [Description]
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*
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* Verify that, chown(2) succeeds to change the group of a file specified
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* by path when called by non-root user with the following constraints:
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*
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* - euid of the process is equal to the owner of the file.
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* - the intended gid is either egid, or one of the supplementary gids
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* of the process.
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*
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* Also verify that chown() clears the setuid/setgid bits set on the file.
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*/
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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 <grp.h>
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#include <pwd.h>
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#include "tst_test.h"
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#include "compat_tst_16.h"
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#define FILE_MODE (S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
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#define NEW_PERMS (S_IFREG|S_IRWXU|S_IRWXG|S_ISUID|S_ISGID)
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#define FILENAME "chown03_testfile"
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static struct passwd *ltpuser;
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static void check_owner(struct stat *s, uid_t exp_uid, gid_t exp_gid)
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{
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if (s->st_uid != exp_uid || s->st_gid != exp_gid)
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tst_res(TFAIL, "%s: wrong owner set to (uid=%d, gid=%d),"
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" expected (uid=%d, gid=%d)",
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FILENAME, s->st_uid, s->st_gid, exp_uid, exp_gid);
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}
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static void check_mode(struct stat *s, mode_t exp_mode)
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{
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if (s->st_mode != exp_mode)
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tst_res(TFAIL, "%s: wrong mode permissions %#o, expected %#o",
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FILENAME, s->st_mode, exp_mode);
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}
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static void run(void)
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{
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SAFE_SETEUID(0);
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SAFE_CHOWN(FILENAME, -1, 0);
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SAFE_CHMOD(FILENAME, NEW_PERMS);
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SAFE_SETEUID(ltpuser->pw_uid);
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uid_t uid;
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gid_t gid;
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UID16_CHECK((uid = geteuid()), "chown");
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GID16_CHECK((gid = getegid()), "chown");
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struct stat stat_buf;
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SAFE_STAT(FILENAME, &stat_buf);
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check_owner(&stat_buf, uid, 0);
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check_mode(&stat_buf, NEW_PERMS);
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TST_EXP_PASS(CHOWN(FILENAME, -1, gid), "chown(%s, %d, %d)",
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FILENAME, -1, gid);
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SAFE_STAT(FILENAME, &stat_buf);
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check_owner(&stat_buf, uid, gid);
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check_mode(&stat_buf, NEW_PERMS & ~(S_ISUID | S_ISGID));
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}
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static void setup(void)
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{
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int fd;
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ltpuser = SAFE_GETPWNAM("nobody");
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SAFE_SETEGID(ltpuser->pw_gid);
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SAFE_SETEUID(ltpuser->pw_uid);
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fd = SAFE_OPEN(FILENAME, O_RDWR | O_CREAT, FILE_MODE);
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SAFE_CLOSE(fd);
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}
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static void cleanup(void)
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{
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SAFE_SETEGID(0);
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SAFE_SETEUID(0);
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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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.cleanup = cleanup,
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.test_all = run,
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};
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