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1a4c2735 | 1 | /* Basic tests for pldd program. |
6d7e8eda | 2 | Copyright (C) 2019-2023 Free Software Foundation, Inc. |
1a4c2735 AZ |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
1a4c2735 AZ |
18 | |
19 | #include <stdio.h> | |
20 | #include <string.h> | |
da2b83ef | 21 | #include <stdlib.h> |
1a4c2735 AZ |
22 | #include <unistd.h> |
23 | #include <stdint.h> | |
1a4c2735 AZ |
24 | #include <stdbool.h> |
25 | ||
26 | #include <array_length.h> | |
27 | #include <gnu/lib-names.h> | |
28 | ||
29 | #include <support/subprocess.h> | |
30 | #include <support/capture_subprocess.h> | |
31 | #include <support/check.h> | |
da2b83ef | 32 | #include <support/support.h> |
2f9046fb SL |
33 | #include <support/xptrace.h> |
34 | #include <support/xunistd.h> | |
35 | #include <sys/mman.h> | |
36 | #include <errno.h> | |
37 | #include <signal.h> | |
1a4c2735 AZ |
38 | |
39 | static void | |
40 | target_process (void *arg) | |
41 | { | |
42 | pause (); | |
43 | } | |
44 | ||
2f9046fb SL |
45 | static void |
46 | pldd_process (void *arg) | |
47 | { | |
48 | pid_t *target_pid_ptr = (pid_t *) arg; | |
49 | ||
50 | /* Create a copy of current test to check with pldd. As the | |
51 | target_process is a child of this pldd_process, pldd is also able | |
52 | to attach to target_process if YAMA is configured to 1 = | |
53 | "restricted ptrace". */ | |
54 | struct support_subprocess target = support_subprocess (target_process, NULL); | |
55 | ||
56 | /* Store the pid of target-process as do_test needs it in order to | |
57 | e.g. terminate it at end of the test. */ | |
58 | *target_pid_ptr = target.pid; | |
59 | ||
60 | /* Three digits per byte plus null terminator. */ | |
61 | char pid[3 * sizeof (uint32_t) + 1]; | |
62 | snprintf (pid, array_length (pid), "%d", target.pid); | |
63 | ||
64 | char *prog = xasprintf ("%s/pldd", support_bindir_prefix); | |
65 | ||
66 | /* Run pldd and use the pid of target_process as argument. */ | |
67 | execve (prog, (char *const []) { (char *) prog, pid, NULL }, | |
68 | (char *const []) { NULL }); | |
69 | ||
70 | FAIL_EXIT1 ("Returned from execve: errno=%d=%m\n", errno); | |
71 | } | |
72 | ||
1a4c2735 AZ |
73 | /* The test runs in a container because pldd does not support tracing |
74 | a binary started by the loader iself (as with testrun.sh). */ | |
75 | ||
b2af6fb2 AZ |
76 | static bool |
77 | in_str_list (const char *libname, const char *const strlist[]) | |
78 | { | |
79 | for (const char *const *str = strlist; *str != NULL; str++) | |
80 | if (strcmp (libname, *str) == 0) | |
81 | return true; | |
82 | return false; | |
83 | } | |
84 | ||
1a4c2735 AZ |
85 | static int |
86 | do_test (void) | |
87 | { | |
2fe64148 DD |
88 | support_need_proc ("needs /proc/sys/kernel/yama/ptrace_scope and /proc/$child"); |
89 | ||
2f9046fb | 90 | /* Check if our subprocess can be debugged with ptrace. */ |
1a4c2735 | 91 | { |
2f9046fb SL |
92 | int ptrace_scope = support_ptrace_scope (); |
93 | if (ptrace_scope >= 2) | |
94 | FAIL_UNSUPPORTED ("/proc/sys/kernel/yama/ptrace_scope >= 2"); | |
95 | } | |
1a4c2735 | 96 | |
2f9046fb SL |
97 | pid_t *target_pid_ptr = (pid_t *) xmmap (NULL, sizeof (pid_t), |
98 | PROT_READ | PROT_WRITE, | |
99 | MAP_SHARED | MAP_ANONYMOUS, -1); | |
da2b83ef | 100 | |
2f9046fb SL |
101 | /* Run 'pldd' on test subprocess which will be created in pldd_process. |
102 | The pid of the subprocess will be written to target_pid_ptr. */ | |
103 | struct support_capture_subprocess pldd; | |
104 | pldd = support_capture_subprocess (pldd_process, target_pid_ptr); | |
105 | support_capture_subprocess_check (&pldd, "pldd", 0, sc_allow_stdout); | |
1a4c2735 AZ |
106 | |
107 | /* Check 'pldd' output. The test is expected to be linked against only | |
108 | loader and libc. */ | |
109 | { | |
110 | pid_t pid; | |
c353689e AZ |
111 | #define BUFFERLEN 511 |
112 | char buffer[BUFFERLEN + 1]; | |
113 | #define STRINPUT(size) XSTRINPUT(size) | |
114 | #define XSTRINPUT(size) "%" # size "s" | |
1a4c2735 AZ |
115 | |
116 | FILE *out = fmemopen (pldd.out.buffer, pldd.out.length, "r"); | |
117 | TEST_VERIFY (out != NULL); | |
118 | ||
119 | /* First line is in the form of <pid>: <full path of executable> */ | |
c353689e | 120 | TEST_COMPARE (fscanf (out, "%u: " STRINPUT (BUFFERLEN), &pid, buffer), 2); |
1a4c2735 | 121 | |
2f9046fb | 122 | TEST_COMPARE (pid, *target_pid_ptr); |
1a4c2735 AZ |
123 | TEST_COMPARE (strcmp (basename (buffer), "tst-pldd"), 0); |
124 | ||
125 | /* It expects only one loader and libc loaded by the program. */ | |
126 | bool interpreter_found = false, libc_found = false; | |
127 | while (fgets (buffer, array_length (buffer), out) != NULL) | |
128 | { | |
129 | /* Ignore vDSO. */ | |
2f9046fb | 130 | if (buffer[0] != '/') |
1a4c2735 AZ |
131 | continue; |
132 | ||
133 | /* Remove newline so baseline (buffer) can compare against the | |
134 | LD_SO and LIBC_SO macros unmodified. */ | |
135 | if (buffer[strlen(buffer)-1] == '\n') | |
136 | buffer[strlen(buffer)-1] = '\0'; | |
137 | ||
b2af6fb2 AZ |
138 | const char *libname = basename (buffer); |
139 | ||
140 | /* It checks for default names in case of build configure with | |
141 | --enable-hardcoded-path-in-tests (BZ #24506). */ | |
142 | if (in_str_list (libname, | |
143 | (const char *const []) { "ld.so", LD_SO, NULL })) | |
1a4c2735 AZ |
144 | { |
145 | TEST_COMPARE (interpreter_found, false); | |
146 | interpreter_found = true; | |
147 | continue; | |
148 | } | |
149 | ||
b2af6fb2 AZ |
150 | if (in_str_list (libname, |
151 | (const char *const []) { "libc.so", LIBC_SO, NULL })) | |
1a4c2735 AZ |
152 | { |
153 | TEST_COMPARE (libc_found, false); | |
154 | libc_found = true; | |
155 | continue; | |
156 | } | |
157 | } | |
158 | TEST_COMPARE (interpreter_found, true); | |
159 | TEST_COMPARE (libc_found, true); | |
160 | ||
161 | fclose (out); | |
162 | } | |
163 | ||
164 | support_capture_subprocess_free (&pldd); | |
2f9046fb SL |
165 | if (kill (*target_pid_ptr, SIGKILL) != 0) |
166 | FAIL_EXIT1 ("Unable to kill target_process: errno=%d=%m\n", errno); | |
167 | xmunmap (target_pid_ptr, sizeof (pid_t)); | |
1a4c2735 AZ |
168 | |
169 | return 0; | |
170 | } | |
171 | ||
172 | #include <support/test-driver.c> |