1 /* Copyright (C) 2017-2022 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 <https://www.gnu.org/licenses/>. */
17
18 #include <unistd.h>
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <sys/wait.h>
22
23 #include <support/check.h>
24
25 /* Try executing "/bin/sh -c true", using FD opened on /bin/sh. */
26 static int
try_fexecve(int fd)27 try_fexecve (int fd)
28 {
29 pid_t pid = fork ();
30
31 if (pid == 0)
32 {
33 static const char *const argv[] = {
34 "/bin/sh", "-c", "true", NULL
35 };
36 fexecve (fd, (char *const *) argv, environ);
37 _exit (errno);
38 }
39 if (pid < 0)
40 FAIL_RET ("fork failed: %m");
41
42 pid_t termpid;
43 int status;
44 termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
45 if (termpid == -1)
46 FAIL_RET ("waitpid failed: %m");
47 if (termpid != pid)
48 FAIL_RET ("waitpid returned %ld != %ld",
49 (long int) termpid, (long int) pid);
50 if (!WIFEXITED (status))
51 FAIL_RET ("child hasn't exited normally");
52
53 /* If fexecve is unimplemented mark this test as UNSUPPORTED. */
54 if (WEXITSTATUS (status) == ENOSYS)
55 FAIL_UNSUPPORTED ("fexecve is unimplemented");
56
57 if (WEXITSTATUS (status) != 0)
58 {
59 errno = WEXITSTATUS (status);
60 FAIL_RET ("fexecve failed: %m");
61 }
62 return 0;
63 }
64
65 static int
do_test(void)66 do_test (void)
67 {
68 int fd;
69 int ret;
70
71 fd = open ("/bin/sh", O_RDONLY);
72 if (fd < 0)
73 FAIL_UNSUPPORTED ("/bin/sh cannot be opened: %m");
74 ret = try_fexecve (fd);
75 close (fd);
76
77 #ifdef O_PATH
78 fd = open ("/bin/sh", O_RDONLY | O_PATH);
79 if (fd < 0)
80 FAIL_UNSUPPORTED ("/bin/sh cannot be opened (O_PATH): %m");
81 ret |= try_fexecve (fd);
82 close (fd);
83 #endif
84
85 return ret;
86 }
87
88 #include <support/test-driver.c>
89