1/* Fortify tests for syslog interface.
2 Copyright (C) 2023-2024 Free Software Foundation, Inc.
3 Copyright The GNU Toolchain Authors.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#include <stdarg.h>
21#include <setjmp.h>
22#include <syslog.h>
23#include <string.h>
24#include <unistd.h>
25
26#include <support/check.h>
27#include <support/support.h>
28#include <support/capture_subprocess.h>
29
30static const char *str2 = "F";
31static char buf2[10] = "%s";
32
33static volatile int chk_fail_ok;
34static jmp_buf chk_fail_buf;
35
36static void
37handler (int sig)
38{
39 if (chk_fail_ok)
40 {
41 chk_fail_ok = 0;
42 longjmp (chk_fail_buf, 1);
43 }
44 else
45 _exit (127);
46}
47
48#define CHK_FAIL_START \
49 chk_fail_ok = 1; \
50 if (! setjmp (chk_fail_buf)) \
51 {
52#define CHK_FAIL_END \
53 chk_fail_ok = 0; \
54 FAIL ("not supposed to reach here"); \
55 }
56
57static void
58call_vsyslog (int priority, const char *format, ...)
59{
60 va_list va;
61 va_start (va, format);
62 vsyslog (pri: priority, fmt: format, ap: va);
63 va_end (va);
64}
65
66static void
67run_syslog_chk (void *closure)
68{
69 int n1;
70 CHK_FAIL_START
71 syslog (LOG_USER | LOG_DEBUG, buf2, str2, &n1, str2, &n1);
72 CHK_FAIL_END
73}
74
75static void
76run_vsyslog_chk (void *closure)
77{
78 int n1;
79 CHK_FAIL_START
80 call_vsyslog (LOG_USER | LOG_DEBUG, format: buf2, str2, &n1, str2, &n1);
81 CHK_FAIL_END
82}
83
84static int
85do_test (void)
86{
87 set_fortify_handler (handler);
88
89 int n1, n2;
90
91 n1 = n2 = 0;
92 syslog (LOG_USER | LOG_DEBUG, "%s%n%s%n", str2, &n1, str2, &n2);
93 TEST_COMPARE (n1, 1);
94 TEST_COMPARE (n2, 2);
95
96 n1 = n2 = 0;
97 call_vsyslog (LOG_USER | LOG_DEBUG, format: "%s%n%s%n", str2, &n1, str2, &n2);
98 TEST_COMPARE (n1, 1);
99 TEST_COMPARE (n2, 2);
100
101 strcpy (buf2 + 2, "%n%s%n");
102
103 /* The wrapper tests need to be in a subprocess because the abort called by
104 printf does not unlock the internal syslog lock. */
105 {
106 struct support_capture_subprocess result
107 = support_capture_subprocess (callback: run_syslog_chk, NULL);
108 support_capture_subprocess_check (&result, context: "syslog", status_or_signal: 0, allowed: sc_allow_stderr);
109 support_capture_subprocess_free (&result);
110 }
111
112 {
113 struct support_capture_subprocess result
114 = support_capture_subprocess (callback: run_vsyslog_chk, NULL);
115 support_capture_subprocess_check (&result, context: "syslog", status_or_signal: 0, allowed: sc_allow_stderr);
116 support_capture_subprocess_free (&result);
117 }
118
119 return 0;
120}
121
122#include <support/test-driver.c>
123

source code of glibc/debug/tst-fortify-syslog.c