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 | |
37 | static char SETGID_CHILD[] = "setgid-child" ; |
38 | |
39 | #ifndef test_child |
40 | static int |
41 | test_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 |
66 | static int |
67 | test_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 | |
91 | static int |
92 | do_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 | |