1/* Copyright (C) 2012-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18/* Verify that tunables correctly filter out unsafe environment variables like
19 MALLOC_CHECK_ and MALLOC_MMAP_THRESHOLD_ but also retain
20 MALLOC_MMAP_THRESHOLD_ in an unprivileged child. */
21
22#include <errno.h>
23#include <fcntl.h>
24#include <stdlib.h>
25#include <stdint.h>
26#include <stdio.h>
27#include <string.h>
28#include <sys/stat.h>
29#include <sys/wait.h>
30#include <unistd.h>
31
32#include <support/check.h>
33#include <support/support.h>
34#include <support/test-driver.h>
35#include <support/capture_subprocess.h>
36
37static char SETGID_CHILD[] = "setgid-child";
38
39#ifndef test_child
40static int
41test_child (void)
42{
43 if (getenv (name: "MALLOC_CHECK_") != NULL)
44 {
45 printf (format: "MALLOC_CHECK_ is still set\n");
46 return 1;
47 }
48
49 if (getenv (name: "MALLOC_MMAP_THRESHOLD_") == NULL)
50 {
51 printf (format: "MALLOC_MMAP_THRESHOLD_ lost\n");
52 return 1;
53 }
54
55 if (getenv (name: "LD_HWCAP_MASK") != NULL)
56 {
57 printf (format: "LD_HWCAP_MASK still set\n");
58 return 1;
59 }
60
61 return 0;
62}
63#endif
64
65#ifndef test_parent
66static int
67test_parent (void)
68{
69 if (getenv (name: "MALLOC_CHECK_") == NULL)
70 {
71 printf (format: "MALLOC_CHECK_ lost\n");
72 return 1;
73 }
74
75 if (getenv (name: "MALLOC_MMAP_THRESHOLD_") == NULL)
76 {
77 printf (format: "MALLOC_MMAP_THRESHOLD_ lost\n");
78 return 1;
79 }
80
81 if (getenv (name: "LD_HWCAP_MASK") == NULL)
82 {
83 printf (format: "LD_HWCAP_MASK lost\n");
84 return 1;
85 }
86
87 return 0;
88}
89#endif
90
91static int
92do_test (int argc, char **argv)
93{
94 /* Setgid child process. */
95 if (argc == 2 && strcmp (s1: argv[1], s2: SETGID_CHILD) == 0)
96 {
97 if (getgid () == getegid ())
98 /* This can happen if the file system is mounted nosuid. */
99 FAIL_UNSUPPORTED ("SGID failed: GID and EGID match (%jd)\n",
100 (intmax_t) getgid ());
101
102 int ret = test_child ();
103
104 if (ret != 0)
105 exit (status: 1);
106
107 exit (EXIT_SUCCESS);
108 }
109 else
110 {
111 if (test_parent () != 0)
112 exit (status: 1);
113
114 int status = support_capture_subprogram_self_sgid (child_id: SETGID_CHILD);
115
116 if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
117 return EXIT_UNSUPPORTED;
118
119 if (!WIFEXITED (status))
120 FAIL_EXIT1 ("Unexpected exit status %d from child process\n", status);
121
122 return 0;
123 }
124}
125
126#define TEST_FUNCTION_ARGV do_test
127#include <support/test-driver.c>
128

source code of glibc/elf/tst-env-setuid.c