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1 | /* Check DTAUDIT and vDSO interaction. |
2 | Copyright (C) 2021 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <getopt.h> | |
21 | #include <limits.h> | |
22 | #include <inttypes.h> | |
23 | #include <string.h> | |
24 | #include <stdlib.h> | |
25 | #include <support/capture_subprocess.h> | |
26 | #include <support/check.h> | |
27 | #include <support/xstdio.h> | |
28 | #include <support/support.h> | |
29 | #include <sys/auxv.h> | |
30 | ||
31 | static int restart; | |
32 | #define CMDLINE_OPTIONS \ | |
33 | { "restart", no_argument, &restart, 1 }, | |
34 | ||
35 | static uintptr_t vdso_addr; | |
36 | ||
37 | static int | |
38 | handle_restart (void) | |
39 | { | |
40 | fprintf (stderr, "vdso: %p\n", (void*) vdso_addr); | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static uintptr_t | |
45 | parse_address (const char *str) | |
46 | { | |
47 | void *r; | |
48 | TEST_COMPARE (sscanf (str, "%p\n", &r), 1); | |
49 | return (uintptr_t) r; | |
50 | } | |
51 | ||
52 | static inline bool | |
53 | startswith (const char *str, const char *pre) | |
54 | { | |
55 | size_t lenpre = strlen (pre); | |
56 | size_t lenstr = strlen (str); | |
57 | return lenstr >= lenpre && memcmp (pre, str, lenpre) == 0; | |
58 | } | |
59 | ||
60 | static int | |
61 | do_test (int argc, char *argv[]) | |
62 | { | |
63 | vdso_addr = getauxval (AT_SYSINFO_EHDR); | |
64 | if (vdso_addr == 0) | |
65 | FAIL_UNSUPPORTED ("getauxval (AT_SYSINFO_EHDR) returned 0"); | |
66 | ||
67 | /* We must have either: | |
68 | - One our fource parameters left if called initially: | |
69 | + path to ld.so optional | |
70 | + "--library-path" optional | |
71 | + the library path optional | |
72 | + the application name */ | |
73 | if (restart) | |
74 | return handle_restart (); | |
75 | ||
76 | char *spargv[9]; | |
77 | int i = 0; | |
78 | for (; i < argc - 1; i++) | |
79 | spargv[i] = argv[i + 1]; | |
80 | spargv[i++] = (char *) "--direct"; | |
81 | spargv[i++] = (char *) "--restart"; | |
82 | spargv[i] = NULL; | |
83 | ||
84 | setenv ("LD_AUDIT", "tst-auditmod22.so", 0); | |
85 | struct support_capture_subprocess result | |
86 | = support_capture_subprogram (spargv[0], spargv); | |
87 | support_capture_subprocess_check (&result, "tst-audit22", 0, sc_allow_stderr); | |
88 | ||
89 | /* The respawned process should always print the vDSO address (otherwise it | |
90 | will fails as unsupported). However, on some architectures the audit | |
91 | module might see the vDSO with l_addr being 0, meaning a fixed mapping | |
92 | (linux-gate.so). In this case we don't check its value against | |
93 | AT_SYSINFO_EHDR one. */ | |
94 | uintptr_t vdso_process = 0; | |
95 | bool vdso_audit_found = false; | |
96 | uintptr_t vdso_audit = 0; | |
97 | ||
98 | FILE *out = fmemopen (result.err.buffer, result.err.length, "r"); | |
99 | TEST_VERIFY (out != NULL); | |
100 | char *buffer = NULL; | |
101 | size_t buffer_length = 0; | |
102 | while (xgetline (&buffer, &buffer_length, out)) | |
103 | { | |
104 | if (startswith (buffer, "vdso: ")) | |
105 | vdso_process = parse_address (buffer + strlen ("vdso: ")); | |
106 | else if (startswith (buffer, "vdso found: ")) | |
107 | { | |
108 | vdso_audit = parse_address (buffer + strlen ("vdso found: ")); | |
109 | vdso_audit_found = true; | |
110 | } | |
111 | } | |
112 | ||
113 | TEST_COMPARE (vdso_audit_found, true); | |
114 | if (vdso_audit != 0) | |
115 | TEST_COMPARE (vdso_process, vdso_audit); | |
116 | ||
117 | free (buffer); | |
118 | xfclose (out); | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | #define TEST_FUNCTION_ARGV do_test | |
124 | #include <support/test-driver.c> |