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/*
* Author: Colin King <colin.king@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 <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#define TEST_PASSED (0)
#define TEST_FAILED (1)
#define TEST_ERROR (2)
#define MMAP_LEN (4096)
/*
* https://bugs.launchpad.net/ecryptfs/+bug/400443
*
* mmap() on a directory should return -ENODEV, but bug LP: #400443
* ecryptfs returns a mmap'd address which causes SIGBUS on access.
*/
int main(int argc, char **argv)
{
int fd;
unsigned int *ptr;
char path[PATH_MAX];
if (argc < 2) {
fprintf(stderr, "Usage: path\n");
exit(TEST_ERROR);
}
snprintf(path, sizeof(path), "%s/.", argv[1]);
if ((fd = open(path, O_RDONLY)) < 0) {
fprintf(stderr, "Cannot open ./. : %s\n", strerror(errno));
exit(TEST_ERROR);
}
ptr = mmap(NULL, MMAP_LEN, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
if (ptr != MAP_FAILED) {
/* Should not be able to mmap onto a directory */
fprintf(stderr, "mmap() on a directory should produce return "
"MAP_FAILED, instead got %p\n", ptr);
munmap(ptr, MMAP_LEN);
exit(TEST_FAILED);
}
if (errno != ENODEV) {
fprintf(stderr, "mmap() on a directory should return ENODEV, "
"instead got %d (%s)\n", errno, strerror(errno));
exit(TEST_FAILED);
}
exit(TEST_PASSED);
}
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