148 lines
3.3 KiB
C
148 lines
3.3 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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* Copyright (c) 2019 SUSE LLC <mdoucha@suse.cz>
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*/
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/*
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* Check that the chdir() syscall returns correct value and error code
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* in various situations when called with root privileges
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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 <unistd.h>
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#include <pwd.h>
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#include "tst_test.h"
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#define MNTPOINT "mntpoint"
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#define FILE_NAME "testfile"
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#define DIR_NAME "subdir"
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#define BLOCKED_NAME "keep_out"
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#define LINK_NAME1 "symloop"
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#define LINK_NAME2 "symloop2"
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static char *workdir;
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static int skip_symlinks, skip_blocked;
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static struct passwd *ltpuser;
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static struct test_case {
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const char *name;
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int root_ret, root_err, nobody_ret, nobody_err;
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} testcase_list[] = {
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{FILE_NAME, -1, ENOTDIR, -1, ENOTDIR},
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{BLOCKED_NAME, 0, 0, -1, EACCES},
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{DIR_NAME, 0, 0, 0, 0},
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{".", 0, 0, 0, 0},
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{"..", 0, 0, 0, 0},
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{"/", 0, 0, 0, 0},
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{"missing", -1, ENOENT, -1, ENOENT},
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{LINK_NAME1, -1, ELOOP, -1, ELOOP},
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};
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static void setup(void)
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{
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char *cwd;
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int fd;
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struct stat statbuf;
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cwd = SAFE_GETCWD(NULL, 0);
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workdir = SAFE_MALLOC(strlen(cwd) + strlen(MNTPOINT) + 2);
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sprintf(workdir, "%s/%s", cwd, MNTPOINT);
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free(cwd);
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SAFE_CHDIR(workdir);
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mode_t sys_umask = umask(0);
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SAFE_MKDIR(DIR_NAME, 0755);
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SAFE_MKDIR(BLOCKED_NAME, 0644);
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umask(sys_umask);
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/* FAT and NTFS override file and directory permissions */
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SAFE_STAT(BLOCKED_NAME, &statbuf);
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skip_blocked = statbuf.st_mode & 0111;
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skip_symlinks = 0;
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TEST(symlink(LINK_NAME1, LINK_NAME2));
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if (!TST_RET)
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SAFE_SYMLINK(LINK_NAME2, LINK_NAME1);
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else if (TST_RET == -1 && (TST_ERR == EPERM || TST_ERR == ENOSYS))
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skip_symlinks = 1;
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else
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tst_brk(TBROK | TTERRNO, "Cannot create symlinks");
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fd = SAFE_CREAT(FILE_NAME, 0644);
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SAFE_CLOSE(fd);
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if (!ltpuser)
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ltpuser = SAFE_GETPWNAM("nobody");
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}
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static void check_result(const char *user, const char *name, int retval,
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int experr)
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{
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if (TST_RET != retval) {
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tst_res(TFAIL | TTERRNO,
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"%s: chdir(\"%s\") returned unexpected value %ld",
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user, name, TST_RET);
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return;
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}
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if (TST_RET != 0 && TST_ERR != experr) {
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tst_res(TFAIL | TTERRNO,
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"%s: chdir(\"%s\") returned unexpected error", user,
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name);
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return;
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}
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tst_res(TPASS | TTERRNO, "%s: chdir(\"%s\") returned correct value",
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user, name);
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}
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static void run(unsigned int n)
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{
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struct test_case *tc = testcase_list + n;
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if (tc->root_err == ELOOP && skip_symlinks) {
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tst_res(TCONF, "Skipping symlink loop test, not supported");
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return;
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}
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/* Reset current directory to mountpoint */
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SAFE_CHDIR(workdir);
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TEST(chdir(tc->name));
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check_result("root", tc->name, tc->root_ret, tc->root_err);
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if (tc->nobody_err == EACCES && skip_blocked) {
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tst_res(TCONF, "Skipping unprivileged permission test, "
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"FS mangles dir mode");
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return;
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}
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SAFE_CHDIR(workdir);
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SAFE_SETEUID(ltpuser->pw_uid);
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TEST(chdir(tc->name));
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SAFE_SETEUID(0);
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check_result("nobody", tc->name, tc->nobody_ret, tc->nobody_err);
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}
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static void cleanup(void)
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{
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free(workdir);
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}
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static struct tst_test test = {
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.needs_root = 1,
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.mount_device = 1,
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.mntpoint = MNTPOINT,
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.all_filesystems = 1,
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.test = run,
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.tcnt = ARRAY_SIZE(testcase_list),
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.setup = setup,
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.cleanup = cleanup
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};
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