• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) 2018 Linux Test Project
4  * Copyright (c) 2015 Cyril Hrubis <chrubis@suse.cz>
5  * Copyright (c) International Business Machines Corp., 2001
6  *
7  * Ported to LTP: Wayne Boyer
8  *  21/04/2008 Renaud Lottiaux (Renaud.Lottiaux@kerlabs.com)
9  */
10 
11 /*
12  * Attempt to execve(2) an executable owned by root with no execute permissions
13  * for the other users, fails when execve(2) is used as a non-root user, the
14  * errno should be EACCES.
15  */
16 
17 #ifndef _GNU_SOURCE
18 #define _GNU_SOURCE
19 #endif
20 #include <sys/types.h>
21 #include <sys/stat.h>
22 #include <errno.h>
23 #include <pwd.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <unistd.h>
28 
29 #include "tst_test.h"
30 
31 #define TEST_APP "execve_child"
32 #define USER_NAME "nobody"
33 
34 static uid_t nobody_uid;
35 
do_child(void)36 static void do_child(void)
37 {
38 	char *argv[2] = {TEST_APP, NULL};
39 
40 	SAFE_SETEUID(nobody_uid);
41 
42 	/* Use environ:
43 	 *     Inherit a copy of parent's environment
44 	 *     for tst_reinit() in execve_child.c
45 	 */
46 	TEST(execve(TEST_APP, argv, environ));
47 
48 	if (!TST_RET)
49 		tst_brk(TFAIL, "execve() passed unexpectedly");
50 
51 	if (TST_ERR != EACCES)
52 		tst_brk(TFAIL | TTERRNO, "execve() failed unexpectedly");
53 
54 	tst_res(TPASS | TTERRNO, "execve() failed expectedly");
55 
56 	exit(0);
57 }
58 
verify_execve(void)59 static void verify_execve(void)
60 {
61 	pid_t pid = SAFE_FORK();
62 
63 	if (pid == 0)
64 		do_child();
65 }
66 
setup(void)67 static void setup(void)
68 {
69 	struct passwd *pwd;
70 
71 	SAFE_CHMOD(TEST_APP, 0700);
72 
73 	pwd = SAFE_GETPWNAM(USER_NAME);
74 	nobody_uid = pwd->pw_uid;
75 }
76 
77 static const char *const resource_files[] = {
78 	TEST_APP,
79 	NULL,
80 };
81 
82 static struct tst_test test = {
83 	.needs_root = 1,
84 	.forks_child = 1,
85 	.child_needs_reinit = 1,
86 	.setup = setup,
87 	.resource_files = resource_files,
88 	.test_all = verify_execve,
89 };
90