| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2013 SUSE. All Rights Reserved. |
| * |
| * Started by Jan Kara <jack@suse.cz> |
| * |
| * DESCRIPTION |
| * Check that fanotify work for a file |
| */ |
| #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/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) |
| |
| #define BUF_SIZE 256 |
| #define TST_TOTAL 12 |
| |
| static struct tcase { |
| const char *tname; |
| struct fanotify_mark_type mark; |
| } tcases[] = { |
| { |
| "inode mark events", |
| INIT_FANOTIFY_MARK_TYPE(INODE), |
| }, |
| { |
| "mount mark events", |
| INIT_FANOTIFY_MARK_TYPE(MOUNT), |
| }, |
| { |
| "filesystem mark events", |
| INIT_FANOTIFY_MARK_TYPE(FILESYSTEM), |
| }, |
| }; |
| |
| static char fname[BUF_SIZE]; |
| static char buf[BUF_SIZE]; |
| static int fd_notify; |
| |
| static unsigned long long event_set[EVENT_MAX]; |
| |
| static char event_buf[EVENT_BUF_LEN]; |
| |
| static void test_fanotify(unsigned int n) |
| { |
| struct tcase *tc = &tcases[n]; |
| struct fanotify_mark_type *mark = &tc->mark; |
| int fd, ret, len, i = 0, test_num = 0; |
| int tst_count = 0; |
| |
| tst_res(TINFO, "Test #%d: %s", n, tc->tname); |
| |
| fd_notify = SAFE_FANOTIFY_INIT(FAN_CLASS_NOTIF, O_RDONLY); |
| |
| if (fanotify_mark(fd_notify, FAN_MARK_ADD | mark->flag, |
| FAN_ACCESS | FAN_MODIFY | FAN_CLOSE | FAN_OPEN, |
| AT_FDCWD, fname) < 0) { |
| if (errno == EINVAL && mark->flag == FAN_MARK_FILESYSTEM) { |
| tst_res(TCONF, |
| "FAN_MARK_FILESYSTEM not supported in kernel?"); |
| return; |
| } |
| tst_brk(TBROK | TERRNO, |
| "fanotify_mark (%d, FAN_MARK_ADD, FAN_ACCESS | %s | " |
| "FAN_MODIFY | FAN_CLOSE | FAN_OPEN, AT_FDCWD, %s) " |
| "failed", fd_notify, mark->name, fname); |
| } |
| |
| /* |
| * generate sequence of events |
| */ |
| fd = SAFE_OPEN(fname, O_RDONLY); |
| event_set[tst_count] = FAN_OPEN; |
| tst_count++; |
| |
| SAFE_READ(0, fd, buf, BUF_SIZE); |
| event_set[tst_count] = FAN_ACCESS; |
| tst_count++; |
| |
| SAFE_CLOSE(fd); |
| event_set[tst_count] = FAN_CLOSE_NOWRITE; |
| tst_count++; |
| |
| /* |
| * Get list of events so far. We get events here to avoid |
| * merging of following events with the previous ones. |
| */ |
| ret = SAFE_READ(0, fd_notify, event_buf, EVENT_BUF_LEN); |
| len = ret; |
| |
| fd = SAFE_OPEN(fname, O_RDWR | O_CREAT, 0700); |
| event_set[tst_count] = FAN_OPEN; |
| tst_count++; |
| |
| SAFE_WRITE(1, fd, fname, strlen(fname)); |
| event_set[tst_count] = FAN_MODIFY; |
| tst_count++; |
| |
| SAFE_CLOSE(fd); |
| event_set[tst_count] = FAN_CLOSE_WRITE; |
| tst_count++; |
| |
| /* |
| * get another list of events |
| */ |
| ret = SAFE_READ(0, fd_notify, event_buf + len, |
| EVENT_BUF_LEN - len); |
| len += ret; |
| |
| /* |
| * Ignore mask testing |
| */ |
| |
| /* Ignore access events */ |
| if (fanotify_mark(fd_notify, |
| FAN_MARK_ADD | mark->flag | FAN_MARK_IGNORED_MASK, |
| FAN_ACCESS, AT_FDCWD, fname) < 0) { |
| tst_brk(TBROK | TERRNO, |
| "fanotify_mark (%d, FAN_MARK_ADD | %s | " |
| "FAN_MARK_IGNORED_MASK, FAN_ACCESS, AT_FDCWD, %s) " |
| "failed", fd_notify, mark->name, fname); |
| } |
| |
| fd = SAFE_OPEN(fname, O_RDWR); |
| event_set[tst_count] = FAN_OPEN; |
| tst_count++; |
| |
| /* This event should be ignored */ |
| SAFE_READ(0, fd, buf, BUF_SIZE); |
| |
| /* |
| * get another list of events to verify the last one got ignored |
| */ |
| ret = SAFE_READ(0, fd_notify, event_buf + len, |
| EVENT_BUF_LEN - len); |
| len += ret; |
| |
| lseek(fd, 0, SEEK_SET); |
| /* Generate modify event to clear ignore mask */ |
| SAFE_WRITE(1, fd, fname, 1); |
| event_set[tst_count] = FAN_MODIFY; |
| tst_count++; |
| |
| /* |
| * This event shouldn't be ignored because previous modification |
| * should have removed the ignore mask |
| */ |
| SAFE_READ(0, fd, buf, BUF_SIZE); |
| event_set[tst_count] = FAN_ACCESS; |
| tst_count++; |
| |
| SAFE_CLOSE(fd); |
| event_set[tst_count] = FAN_CLOSE_WRITE; |
| tst_count++; |
| |
| /* Read events to verify previous access was properly generated */ |
| ret = SAFE_READ(0, fd_notify, event_buf + len, |
| EVENT_BUF_LEN - len); |
| len += ret; |
| |
| /* |
| * Now ignore open & close events regardless of file |
| * modifications |
| */ |
| if (fanotify_mark(fd_notify, FAN_MARK_ADD | mark->flag | |
| FAN_MARK_IGNORED_MASK | FAN_MARK_IGNORED_SURV_MODIFY, |
| FAN_OPEN | FAN_CLOSE, AT_FDCWD, fname) < 0) { |
| tst_brk(TBROK | TERRNO, |
| "fanotify_mark (%d, FAN_MARK_ADD | %s | " |
| "FAN_MARK_IGNORED_MASK | FAN_MARK_IGNORED_SURV_MODIFY, " |
| "FAN_OPEN | FAN_CLOSE, AT_FDCWD, %s) failed", |
| fd_notify, mark->name, fname); |
| } |
| |
| /* This event should be ignored */ |
| fd = SAFE_OPEN(fname, O_RDWR); |
| |
| SAFE_WRITE(1, fd, fname, 1); |
| event_set[tst_count] = FAN_MODIFY; |
| tst_count++; |
| |
| /* This event should be still ignored */ |
| SAFE_CLOSE(fd); |
| |
| /* This event should still be ignored */ |
| fd = SAFE_OPEN(fname, O_RDWR); |
| |
| /* Read events to verify open & close were ignored */ |
| ret = SAFE_READ(0, fd_notify, event_buf + len, |
| EVENT_BUF_LEN - len); |
| len += ret; |
| |
| /* Now remove open and close from ignored mask */ |
| if (fanotify_mark(fd_notify, |
| FAN_MARK_REMOVE | mark->flag | FAN_MARK_IGNORED_MASK, |
| FAN_OPEN | FAN_CLOSE, AT_FDCWD, fname) < 0) { |
| tst_brk(TBROK | TERRNO, |
| "fanotify_mark (%d, FAN_MARK_REMOVE | %s | " |
| "FAN_MARK_IGNORED_MASK, FAN_OPEN | FAN_CLOSE, " |
| "AT_FDCWD, %s) failed", fd_notify, |
| mark->name, fname); |
| } |
| |
| SAFE_CLOSE(fd); |
| event_set[tst_count] = FAN_CLOSE_WRITE; |
| tst_count++; |
| |
| /* Read events to verify close was generated */ |
| ret = SAFE_READ(0, fd_notify, event_buf + len, |
| EVENT_BUF_LEN - len); |
| len += ret; |
| |
| if (TST_TOTAL != tst_count) { |
| tst_brk(TBROK, |
| "TST_TOTAL (%d) and tst_count (%d) are not " |
| "equal", TST_TOTAL, tst_count); |
| } |
| tst_count = 0; |
| |
| /* |
| * check events |
| */ |
| while (i < len) { |
| struct fanotify_event_metadata *event; |
| |
| event = (struct fanotify_event_metadata *)&event_buf[i]; |
| if (test_num >= TST_TOTAL) { |
| tst_res(TFAIL, |
| "got unnecessary event: mask=%llx " |
| "pid=%u fd=%d", |
| (unsigned long long)event->mask, |
| (unsigned)event->pid, event->fd); |
| } else if (!(event->mask & event_set[test_num])) { |
| tst_res(TFAIL, |
| "got event: mask=%llx (expected %llx) " |
| "pid=%u fd=%d", |
| (unsigned long long)event->mask, |
| event_set[test_num], |
| (unsigned)event->pid, event->fd); |
| } else if (event->pid != getpid()) { |
| tst_res(TFAIL, |
| "got event: mask=%llx pid=%u " |
| "(expected %u) fd=%d", |
| (unsigned long long)event->mask, |
| (unsigned)event->pid, |
| (unsigned)getpid(), |
| event->fd); |
| } else { |
| if (event->fd == -2) |
| goto pass; |
| ret = read(event->fd, buf, BUF_SIZE); |
| if (ret != (int)strlen(fname)) { |
| tst_res(TFAIL, |
| "cannot read from returned fd " |
| "of event: mask=%llx pid=%u " |
| "fd=%d ret=%d (errno=%d)", |
| (unsigned long long)event->mask, |
| (unsigned)event->pid, |
| event->fd, ret, errno); |
| } else if (memcmp(buf, fname, strlen(fname))) { |
| tst_res(TFAIL, |
| "wrong data read from returned fd " |
| "of event: mask=%llx pid=%u " |
| "fd=%d", |
| (unsigned long long)event->mask, |
| (unsigned)event->pid, |
| event->fd); |
| } else { |
| pass: |
| tst_res(TPASS, |
| "got event: mask=%llx pid=%u fd=%d", |
| (unsigned long long)event->mask, |
| (unsigned)event->pid, event->fd); |
| } |
| } |
| /* |
| * We have verified the data now so close fd and |
| * invalidate it so that we don't check it again |
| * unnecessarily |
| */ |
| if (event->fd >= 0) |
| SAFE_CLOSE(event->fd); |
| event->fd = -2; |
| event->mask &= ~event_set[test_num]; |
| /* No events left in current mask? Go for next event */ |
| if (event->mask == 0) { |
| i += event->event_len; |
| } |
| test_num++; |
| } |
| for (; test_num < TST_TOTAL; test_num++) { |
| tst_res(TFAIL, "didn't get event: mask=%llx", |
| event_set[test_num]); |
| |
| } |
| /* Remove mark to clear FAN_MARK_IGNORED_SURV_MODIFY */ |
| if (fanotify_mark(fd_notify, FAN_MARK_REMOVE | mark->flag, |
| FAN_ACCESS | FAN_MODIFY | FAN_CLOSE | FAN_OPEN, |
| AT_FDCWD, fname) < 0) { |
| tst_brk(TBROK | TERRNO, |
| "fanotify_mark (%d, FAN_MARK_REMOVE | %s, FAN_ACCESS | " |
| "FAN_MODIFY | FAN_CLOSE | FAN_OPEN, AT_FDCWD, %s) " |
| "failed", fd_notify, mark->name, fname); |
| } |
| |
| SAFE_CLOSE(fd_notify); |
| } |
| |
| static void setup(void) |
| { |
| sprintf(fname, "tfile_%d", getpid()); |
| SAFE_FILE_PRINTF(fname, "1"); |
| } |
| |
| static void cleanup(void) |
| { |
| if (fd_notify > 0) |
| SAFE_CLOSE(fd_notify); |
| } |
| |
| static struct tst_test test = { |
| .test = test_fanotify, |
| .tcnt = ARRAY_SIZE(tcases), |
| .setup = setup, |
| .cleanup = cleanup, |
| .needs_tmpdir = 1, |
| .needs_root = 1 |
| }; |
| |
| #else |
| TST_TEST_TCONF("system doesn't have required fanotify support"); |
| #endif |