1 | /* Check DTAUDIT and vDSO interaction. |
2 | Copyright (C) 2021-2024 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, format: "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 (s: pre); |
56 | size_t lenstr = strlen (s: str); |
57 | return lenstr >= lenpre && memcmp (s1: pre, s2: str, n: 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 (name: "LD_AUDIT" , value: "tst-auditmod22.so" , replace: 0); |
85 | struct support_capture_subprocess result |
86 | = support_capture_subprogram (file: spargv[0], argv: spargv); |
87 | support_capture_subprocess_check (&result, context: "tst-audit22" , status_or_signal: 0, allowed: 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 (s: result.err.buffer, len: result.err.length, modes: "r" ); |
99 | TEST_VERIFY (out != NULL); |
100 | char *buffer = NULL; |
101 | size_t buffer_length = 0; |
102 | while (xgetline (lineptr: &buffer, n: &buffer_length, stream: out)) |
103 | { |
104 | if (startswith (str: buffer, pre: "vdso: " )) |
105 | vdso_process = parse_address (str: buffer + strlen (s: "vdso: " )); |
106 | else if (startswith (str: buffer, pre: "vdso found: " )) |
107 | { |
108 | vdso_audit = parse_address (str: buffer + strlen (s: "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 (ptr: buffer); |
118 | xfclose (out); |
119 | |
120 | return 0; |
121 | } |
122 | |
123 | #define TEST_FUNCTION_ARGV do_test |
124 | #include <support/test-driver.c> |
125 | |