/*
* Copyright (c) 2014 SUSE. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Started by Jan Kara <jack@suse.cz>
*
* DESCRIPTION
* Check that fanotify properly merges ignore mask of an inode and
* mountpoint.
*
* This is a regression test for:
*
* commit 8edc6e1688fc8f02c8c1f53a2ec4928cb1055f4d
* Author: Jan Kara <jack@suse.cz>
* Date: Thu Nov 13 15:19:33 2014 -0800
*
* fanotify: fix notification of groups with inode & mount marks
*/
#define _GNU_SOURCE
#include "config.h"
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/syscall.h>
#include "tst_test.h"
#include "fanotify.h"
#if defined(HAVE_SYS_FANOTIFY_H)
#include <sys/fanotify.h>
#define EVENT_MAX 1024
/* size of the event structure, not counting name */
#define EVENT_SIZE (sizeof (struct fanotify_event_metadata))
/* reasonable guess as to size of 1024 events */
#define EVENT_BUF_LEN (EVENT_MAX * EVENT_SIZE)
static void setup(void);
static void cleanup(void);
unsigned int fanotify_prio[] = {
FAN_CLASS_PRE_CONTENT,
FAN_CLASS_CONTENT,
FAN_CLASS_NOTIF
};
#define FANOTIFY_PRIORITIES ARRAY_SIZE(fanotify_prio)
#define GROUPS_PER_PRIO 3
#define BUF_SIZE 256
static char fname[BUF_SIZE];
static int fd;
static int fd_notify[FANOTIFY_PRIORITIES][GROUPS_PER_PRIO];
static char event_buf[EVENT_BUF_LEN];
#define MOUNT_NAME "mntpoint"
static int mount_created;
static void create_fanotify_groups(void)
{
unsigned int p, i;
int ret;
for (p = 0; p < FANOTIFY_PRIORITIES; p++) {
for (i = 0; i < GROUPS_PER_PRIO; i++) {
fd_notify[p][i] = SAFE_FANOTIFY_INIT(fanotify_prio[p] |
FAN_NONBLOCK,
O_RDONLY);
/* Add mount mark for each group */
ret = fanotify_mark(fd_notify[p][i],
FAN_MARK_ADD | FAN_MARK_MOUNT,
FAN_MODIFY,
AT_FDCWD, ".");
if (ret < 0) {
tst_brk(TBROK | TERRNO,
"fanotify_mark(%d, FAN_MARK_ADD | "
"FAN_MARK_MOUNT, FAN_MODIFY, AT_FDCWD,"
" '.') failed", fd_notify[p][i]);
}
/* Add ignore mark for groups with higher priority */
if (p == 0)
continue;
ret = fanotify_mark(fd_notify[p][i],
FAN_MARK_ADD |
FAN_MARK_IGNORED_MASK |
FAN_MARK_IGNORED_SURV_MODIFY,
FAN_MODIFY, AT_FDCWD, fname);
if (ret < 0) {
tst_brk(TBROK | TERRNO,
"fanotify_mark(%d, FAN_MARK_ADD | "
"FAN_MARK_IGNORED_MASK | "
"FAN_MARK_IGNORED_SURV_MODIFY, "
"FAN_MODIFY, AT_FDCWD, %s) failed",
fd_notify[p][i], fname);
}
}
}
}
static void cleanup_fanotify_groups(void)
{
unsigned int i, p;
for (p = 0; p < FANOTIFY_PRIORITIES; p++) {
for (i = 0; i < GROUPS_PER_PRIO; i++) {
if (fd_notify[p][i] && fd_notify[p][i] != -1) {
if (close(fd_notify[p][i]) == -1)
tst_res(TWARN, "close(%d) failed",
fd_notify[p][i]);
fd_notify[p][i] = 0;
}
}
}
}
static void verify_event(int group, struct fanotify_event_metadata *event)
{
if (event->mask != FAN_MODIFY) {
tst_res(TFAIL, "group %d get event: mask %llx (expected %llx) "
"pid=%u fd=%u", group, (unsigned long long)event->mask,
(unsigned long long)FAN_MODIFY,
(unsigned)event->pid, event->fd);
} else if (event->pid != getpid()) {
tst_res(TFAIL, "group %d get event: mask %llx pid=%u "
"(expected %u) fd=%u", group,
(unsigned long long)event->mask, (unsigned)event->pid,
(unsigned)getpid(), event->fd);
} else {
tst_res(TPASS, "group %d get event: mask %llx pid=%u fd=%u",
group, (unsigned long long)event->mask,
(unsigned)event->pid, event->fd);
}
}
void test01(void)
{
int ret;
unsigned int p, i;
struct fanotify_event_metadata *event;
create_fanotify_groups();
/*
* generate sequence of events
*/
fd = SAFE_OPEN(fname, O_RDWR);
SAFE_WRITE(1, fd, fname, strlen(fname));
SAFE_CLOSE(fd);
/* First verify all groups without ignore mask got the event */
for (i = 0; i < GROUPS_PER_PRIO; i++) {
ret = read(fd_notify[0][i], event_buf, EVENT_BUF_LEN);
if (ret < 0) {
if (errno == EAGAIN) {
tst_res(TFAIL, "group %d did not get "
"event", i);
}
tst_brk(TBROK | TERRNO,
"reading fanotify events failed");
}
if (ret < (int)FAN_EVENT_METADATA_LEN) {
tst_brk(TBROK,
"short read when reading fanotify "
"events (%d < %d)", ret,
(int)EVENT_BUF_LEN);
}
event = (struct fanotify_event_metadata *)event_buf;
if (ret > (int)event->event_len) {
tst_res(TFAIL, "group %d got more than one "
"event (%d > %d)", i, ret,
event->event_len);
} else
verify_event(i, event);
close(event->fd);
}
for (p = 1; p < FANOTIFY_PRIORITIES; p++) {
for (i = 0; i < GROUPS_PER_PRIO; i++) {
ret = read(fd_notify[p][i], event_buf, EVENT_BUF_LEN);
if (ret > 0) {
tst_res(TFAIL, "group %d got event",
p*GROUPS_PER_PRIO + i);
} else if (ret == 0) {
tst_brk(TBROK, "zero length "
"read from fanotify fd");
} else if (errno != EAGAIN) {
tst_brk(TBROK | TERRNO,
"reading fanotify events failed");
} else {
tst_res(TPASS, "group %d got no event",
p*GROUPS_PER_PRIO + i);
}
}
}
cleanup_fanotify_groups();
}
static void setup(void)
{
SAFE_MKDIR(MOUNT_NAME, 0755);
SAFE_MOUNT(MOUNT_NAME, MOUNT_NAME, NULL, MS_BIND, NULL);
mount_created = 1;
SAFE_CHDIR(MOUNT_NAME);
sprintf(fname, "tfile_%d", getpid());
fd = SAFE_OPEN(fname, O_RDWR | O_CREAT, 0700);
SAFE_WRITE(1, fd, fname, 1);
/* close the file we have open */
SAFE_CLOSE(fd);
}
static void cleanup(void)
{
cleanup_fanotify_groups();
SAFE_CHDIR("../");
if (mount_created && tst_umount(MOUNT_NAME) < 0)
tst_brk(TBROK | TERRNO, "umount failed");
}
static struct tst_test test = {
.test_all = test01,
.setup = setup,
.cleanup = cleanup,
.needs_tmpdir = 1,
.needs_root = 1
};
#else
TST_TEST_TCONF("system doesn't have required fanotify support");
#endif