257 lines
6.0 KiB
C
257 lines
6.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2014 SUSE. All Rights Reserved.
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*
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* Started by Jan Kara <jack@suse.cz>
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*/
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/*\
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* [Description]
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* Check that fanotify properly merges ignore mask of an inode and mountpoint.
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*/
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/*
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* This is a regression test for:
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*
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* commit 8edc6e1688fc8f02c8c1f53a2ec4928cb1055f4d
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* Author: Jan Kara <jack@suse.cz>
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* Date: Thu Nov 13 15:19:33 2014 -0800
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*
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* fanotify: fix notification of groups with inode & mount marks
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*
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* The overlayfs test case is a regression test for:
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*
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* commit d989903058a83e8536cc7aadf9256a47d5c173fe
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* Author: Amir Goldstein <amir73il@gmail.com>
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* Date: Wed Apr 24 19:39:50 2019 +0300
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*
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* ovl: do not generate duplicate fsnotify events for "fake" path
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*/
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#define _GNU_SOURCE
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#include "config.h"
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/mount.h>
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#include <sys/syscall.h>
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#include "tst_test.h"
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#ifdef HAVE_SYS_FANOTIFY_H
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#include "fanotify.h"
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#define EVENT_MAX 1024
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/* size of the event structure, not counting name */
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#define EVENT_SIZE (sizeof (struct fanotify_event_metadata))
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/* reasonable guess as to size of 1024 events */
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#define EVENT_BUF_LEN (EVENT_MAX * EVENT_SIZE)
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unsigned int fanotify_prio[] = {
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FAN_CLASS_PRE_CONTENT,
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FAN_CLASS_CONTENT,
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FAN_CLASS_NOTIF
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};
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#define FANOTIFY_PRIORITIES ARRAY_SIZE(fanotify_prio)
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#define GROUPS_PER_PRIO 3
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#define BUF_SIZE 256
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static char fname[BUF_SIZE];
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static int fd_notify[FANOTIFY_PRIORITIES][GROUPS_PER_PRIO];
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static char event_buf[EVENT_BUF_LEN];
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static const char mntpoint[] = OVL_BASE_MNTPOINT;
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static int ovl_mounted;
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static struct tcase {
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const char *tname;
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const char *mnt;
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int use_overlay;
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} tcases[] = {
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{ "Fanotify merge mount mark", mntpoint, 0 },
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{ "Fanotify merge overlayfs mount mark", OVL_MNT, 1 },
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};
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static void create_fanotify_groups(void)
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{
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unsigned int p, i;
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for (p = 0; p < FANOTIFY_PRIORITIES; p++) {
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for (i = 0; i < GROUPS_PER_PRIO; i++) {
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fd_notify[p][i] = SAFE_FANOTIFY_INIT(fanotify_prio[p] |
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FAN_NONBLOCK,
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O_RDONLY);
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/* Add mount mark for each group */
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SAFE_FANOTIFY_MARK(fd_notify[p][i],
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FAN_MARK_ADD | FAN_MARK_MOUNT,
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FAN_MODIFY,
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AT_FDCWD, fname);
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/* Add ignore mark for groups with higher priority */
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if (p == 0)
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continue;
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SAFE_FANOTIFY_MARK(fd_notify[p][i],
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FAN_MARK_ADD |
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FAN_MARK_IGNORED_MASK |
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FAN_MARK_IGNORED_SURV_MODIFY,
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FAN_MODIFY, AT_FDCWD, fname);
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}
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}
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}
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static void cleanup_fanotify_groups(void)
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{
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unsigned int i, p;
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for (p = 0; p < FANOTIFY_PRIORITIES; p++) {
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for (i = 0; i < GROUPS_PER_PRIO; i++) {
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if (fd_notify[p][i] > 0)
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SAFE_CLOSE(fd_notify[p][i]);
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}
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}
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}
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static void verify_event(int group, struct fanotify_event_metadata *event)
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{
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if (event->mask != FAN_MODIFY) {
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tst_res(TFAIL, "group %d got event: mask %llx (expected %llx) "
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"pid=%u fd=%d", group, (unsigned long long)event->mask,
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(unsigned long long)FAN_MODIFY,
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(unsigned)event->pid, event->fd);
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} else if (event->pid != getpid()) {
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tst_res(TFAIL, "group %d got event: mask %llx pid=%u "
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"(expected %u) fd=%d", group,
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(unsigned long long)event->mask, (unsigned)event->pid,
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(unsigned)getpid(), event->fd);
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} else {
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tst_res(TPASS, "group %d got event: mask %llx pid=%u fd=%d",
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group, (unsigned long long)event->mask,
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(unsigned)event->pid, event->fd);
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}
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}
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/* Close all file descriptors of read events */
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static void close_events_fd(struct fanotify_event_metadata *event, int buflen)
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{
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while (buflen >= (int)FAN_EVENT_METADATA_LEN) {
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if (event->fd != FAN_NOFD)
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SAFE_CLOSE(event->fd);
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buflen -= (int)FAN_EVENT_METADATA_LEN;
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event++;
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}
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}
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void test_fanotify(unsigned int n)
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{
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int ret;
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unsigned int p, i;
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struct fanotify_event_metadata *event;
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struct tcase *tc = &tcases[n];
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tst_res(TINFO, "Test #%d: %s", n, tc->tname);
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if (tc->use_overlay && !ovl_mounted) {
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tst_res(TCONF,
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"overlayfs is not configured in this kernel.");
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return;
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}
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sprintf(fname, "%s/tfile_%d", tc->mnt, getpid());
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SAFE_TOUCH(fname, 0644, NULL);
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create_fanotify_groups();
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/*
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* generate sequence of events
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*/
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SAFE_FILE_PRINTF(fname, "1");
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/* First verify all groups without ignore mask got the event */
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for (i = 0; i < GROUPS_PER_PRIO; i++) {
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ret = read(fd_notify[0][i], event_buf, EVENT_BUF_LEN);
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if (ret < 0) {
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if (errno == EAGAIN) {
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tst_res(TFAIL, "group %d did not get "
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"event", i);
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}
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tst_brk(TBROK | TERRNO,
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"reading fanotify events failed");
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}
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if (ret < (int)FAN_EVENT_METADATA_LEN) {
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tst_brk(TBROK,
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"short read when reading fanotify "
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"events (%d < %d)", ret,
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(int)EVENT_BUF_LEN);
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}
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event = (struct fanotify_event_metadata *)event_buf;
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if (ret > (int)event->event_len) {
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tst_res(TFAIL, "group %d got more than one "
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"event (%d > %d)", i, ret,
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event->event_len);
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} else {
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verify_event(i, event);
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}
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close_events_fd(event, ret);
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}
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for (p = 1; p < FANOTIFY_PRIORITIES; p++) {
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for (i = 0; i < GROUPS_PER_PRIO; i++) {
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ret = read(fd_notify[p][i], event_buf, EVENT_BUF_LEN);
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if (ret > 0) {
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tst_res(TFAIL, "group %d got event",
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p*GROUPS_PER_PRIO + i);
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close_events_fd((void *)event_buf, ret);
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} else if (ret == 0) {
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tst_brk(TBROK, "zero length "
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"read from fanotify fd");
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} else if (errno != EAGAIN) {
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tst_brk(TBROK | TERRNO,
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"reading fanotify events failed");
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} else {
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tst_res(TPASS, "group %d got no event",
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p*GROUPS_PER_PRIO + i);
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}
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}
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}
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cleanup_fanotify_groups();
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}
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static void setup(void)
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{
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ovl_mounted = TST_MOUNT_OVERLAY();
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}
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static void cleanup(void)
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{
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cleanup_fanotify_groups();
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if (ovl_mounted)
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SAFE_UMOUNT(OVL_MNT);
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}
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static struct tst_test test = {
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.test = test_fanotify,
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.tcnt = ARRAY_SIZE(tcases),
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.setup = setup,
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.cleanup = cleanup,
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.needs_root = 1,
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.mount_device = 1,
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.mntpoint = mntpoint,
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.tags = (const struct tst_tag[]) {
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{"linux-git", "8edc6e1688fc"},
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{"linux-git", "d989903058a8"},
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{}
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}
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};
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#else
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TST_TEST_TCONF("system doesn't have required fanotify support");
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#endif
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