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1 | /* Copyright (C) 2017-2019 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 | <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | /* Verify that tunables correctly filter out unsafe tunables like | |
19 | glibc.malloc.check and glibc.malloc.mmap_threshold but also retain | |
20 | glibc.malloc.mmap_threshold in an unprivileged child. */ | |
21 | ||
22 | /* This is compiled as part of the testsuite but needs to see | |
23 | HAVE_TUNABLES. */ | |
24 | #define _LIBC 1 | |
25 | #include "config.h" | |
26 | #undef _LIBC | |
27 | ||
28 | #define test_parent test_parent_tunables | |
29 | #define test_child test_child_tunables | |
30 | ||
31 | static int test_child_tunables (void); | |
32 | static int test_parent_tunables (void); | |
33 | ||
34 | #include "tst-env-setuid.c" | |
35 | ||
36 | #define CHILD_VALSTRING_VALUE "glibc.malloc.mmap_threshold=4096" | |
37 | #define PARENT_VALSTRING_VALUE \ | |
38 | "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096" | |
39 | ||
40 | static int | |
41 | test_child_tunables (void) | |
42 | { | |
43 | const char *val = getenv ("GLIBC_TUNABLES"); | |
44 | ||
45 | #if HAVE_TUNABLES | |
46 | if (val != NULL && strcmp (val, CHILD_VALSTRING_VALUE) == 0) | |
47 | return 0; | |
48 | ||
49 | if (val != NULL) | |
50 | printf ("Unexpected GLIBC_TUNABLES VALUE %s\n", val); | |
51 | ||
52 | return 1; | |
53 | #else | |
54 | if (val != NULL) | |
55 | { | |
56 | printf ("GLIBC_TUNABLES not cleared\n"); | |
57 | return 1; | |
58 | } | |
59 | return 0; | |
60 | #endif | |
61 | } | |
62 | ||
63 | static int | |
64 | test_parent_tunables (void) | |
65 | { | |
66 | const char *val = getenv ("GLIBC_TUNABLES"); | |
67 | ||
68 | if (val != NULL && strcmp (val, PARENT_VALSTRING_VALUE) == 0) | |
69 | return 0; | |
70 | ||
71 | if (val != NULL) | |
72 | printf ("Unexpected GLIBC_TUNABLES VALUE %s\n", val); | |
73 | ||
74 | return 1; | |
75 | } |