1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/* Copyright (C) 2017-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* Verify that tunables correctly filter out unsafe tunables like
glibc.malloc.check and glibc.malloc.mmap_threshold but also retain
glibc.malloc.mmap_threshold in an unprivileged child. */
/* This is compiled as part of the testsuite but needs to see
HAVE_TUNABLES. */
#define _LIBC 1
#include "config.h"
#undef _LIBC
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <intprops.h>
#include <array_length.h>
#include <support/check.h>
#include <support/support.h>
#include <support/test-driver.h>
#include <support/capture_subprocess.h>
const char *teststrings[] =
{
"glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.check=2:glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096:glibc.malloc.check=2",
"glibc.malloc.perturb=0x800",
"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.perturb=0x800:not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
"glibc.not_valid.check=2:glibc.malloc.mmap_threshold=4096",
"not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096:glibc.malloc.check=2",
"glibc.malloc.check=4:glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096",
":glibc.malloc.garbage=2:glibc.malloc.check=1",
"glibc.malloc.check=1:glibc.malloc.check=2",
"not_valid.malloc.check=2",
"glibc.not_valid.check=2",
};
const char *resultstrings[] =
{
"glibc.malloc.mmap_threshold=4096",
"glibc.malloc.mmap_threshold=4096",
"glibc.malloc.mmap_threshold=4096",
"glibc.malloc.perturb=0x800",
"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.mmap_threshold=4096",
"glibc.malloc.mmap_threshold=4096",
"",
"",
"",
"",
"",
"",
};
static int
test_child (int off)
{
const char *val = getenv ("GLIBC_TUNABLES");
#if HAVE_TUNABLES
if (val != NULL && strcmp (val, resultstrings[off]) == 0)
return 0;
if (val != NULL)
printf ("[%d] Unexpected GLIBC_TUNABLES VALUE %s\n", off, val);
return 1;
#else
if (val != NULL)
{
printf ("[%d] GLIBC_TUNABLES not cleared\n", off);
return 1;
}
return 0;
#endif
}
static int
do_test (int argc, char **argv)
{
/* Setgid child process. */
if (argc == 2)
{
if (getgid () == getegid ())
/* This can happen if the file system is mounted nosuid. */
FAIL_UNSUPPORTED ("SGID failed: GID and EGID match (%jd)\n",
(intmax_t) getgid ());
int ret = test_child (atoi (argv[1]));
if (ret != 0)
exit (1);
exit (EXIT_SUCCESS);
}
else
{
int ret = 0;
/* Spawn tests. */
for (int i = 0; i < array_length (teststrings); i++)
{
char buf[INT_BUFSIZE_BOUND (int)];
printf ("Spawned test for %s (%d)\n", teststrings[i], i);
snprintf (buf, sizeof (buf), "%d\n", i);
if (setenv ("GLIBC_TUNABLES", teststrings[i], 1) != 0)
exit (1);
int status = support_capture_subprogram_self_sgid (buf);
/* Bail out early if unsupported. */
if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
return EXIT_UNSUPPORTED;
ret |= status;
}
return ret;
}
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
|
