1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/**
* test.c: C-based test for https://launchpad.net/bugs/994247
* This should result in a kernel BUG().
* Author: Tyler Hicks <tyhicks@canonical.com>
*
* Copyright (C) 2012 Canonical, Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*/
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
int miscdev;
void sigusr1_handler(int ignored)
{
exit(close(miscdev));
}
int main(void)
{
struct sigaction sa;
pid_t pid;
int status, rc;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sigusr1_handler;
miscdev = open("/dev/ecryptfs", O_RDWR);
if (miscdev < 0)
return 1;
rc = sigaction(SIGUSR1, &sa, NULL);
if (rc < 0)
return 1;
pid = fork();
if (pid < 0)
return 1;
else if (!pid) {
pause();
exit(1);
}
/* The parent must close the file before the child */
close(miscdev);
rc = kill(pid, SIGUSR1);
if (rc < 0)
return 1;
rc = waitpid(pid, &status, 0);
if (rc < 0 || !WIFEXITED(status))
return 1;
return WEXITSTATUS(status);
}
|
