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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018 Matthew Bobrowski. All Rights Reserved.
*
* Started by Matthew Bobrowski <mbobrowski@mbobrowski.org>
*/
/*\
* [Description]
* Validate that the newly introduced FAN_OPEN_EXEC mask functions as expected.
* The idea is to generate a sequence of open related actions to ensure that
* the correct event flags are being set depending on what event mask was
* requested when the object was marked.
*/
#define _GNU_SOURCE
#include "config.h"
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "tst_test.h"
#ifdef HAVE_SYS_FANOTIFY_H
#include "fanotify.h"
#define EVENT_MAX 1024
#define EVENT_SIZE (sizeof(struct fanotify_event_metadata))
#define EVENT_BUF_LEN (EVENT_MAX * EVENT_SIZE)
#define EVENT_SET_BUF 32
#define BUF_SIZE 256
#define TEST_APP "fanotify_child"
static pid_t child_pid;
static char fname[BUF_SIZE];
static volatile int fd_notify;
static volatile int complete;
static char event_buf[EVENT_BUF_LEN];
static int exec_events_unsupported;
static struct test_case_t {
const char *tname;
struct fanotify_mark_type mark;
unsigned long long mask;
unsigned long long ignore_mask;
int event_count;
unsigned long long event_set[EVENT_SET_BUF];
} test_cases[] = {
{
"inode mark, FAN_OPEN events",
INIT_FANOTIFY_MARK_TYPE(INODE),
FAN_OPEN,
0,
2,
{FAN_OPEN, FAN_OPEN}
},
{
"inode mark, FAN_OPEN_EXEC events",
INIT_FANOTIFY_MARK_TYPE(INODE),
FAN_OPEN_EXEC,
0,
1,
{FAN_OPEN_EXEC}
},
{
"inode mark, FAN_OPEN | FAN_OPEN_EXEC events",
INIT_FANOTIFY_MARK_TYPE(INODE),
FAN_OPEN | FAN_OPEN_EXEC,
0,
2,
{FAN_OPEN, FAN_OPEN | FAN_OPEN_EXEC}
},
{
"inode mark, FAN_OPEN events, ignore FAN_OPEN_EXEC",
INIT_FANOTIFY_MARK_TYPE(INODE),
FAN_OPEN,
FAN_OPEN_EXEC,
2,
{FAN_OPEN, FAN_OPEN}
},
{
"inode mark, FAN_OPEN_EXEC events, ignore FAN_OPEN",
INIT_FANOTIFY_MARK_TYPE(INODE),
FAN_OPEN_EXEC,
FAN_OPEN,
1,
{FAN_OPEN_EXEC}
},
{
"inode mark, FAN_OPEN | FAN_OPEN_EXEC events, ignore "
"FAN_OPEN_EXEC",
INIT_FANOTIFY_MARK_TYPE(INODE),
FAN_OPEN | FAN_OPEN_EXEC,
FAN_OPEN_EXEC,
2,
{FAN_OPEN, FAN_OPEN}
}
};
static int generate_events(void)
{
int fd, status;
child_pid = SAFE_FORK();
/*
* Generate a sequence of events
*/
if (child_pid == 0) {
SAFE_CLOSE(fd_notify);
fd = SAFE_OPEN(fname, O_RDONLY);
if (fd > 0)
SAFE_CLOSE(fd);
SAFE_EXECL(TEST_APP, TEST_APP, NULL);
exit(1);
}
SAFE_WAITPID(child_pid, &status, 0);
if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
return 1;
return 0;
}
static int setup_mark(unsigned int n)
{
unsigned int i = 0;
struct test_case_t *tc = &test_cases[n];
struct fanotify_mark_type *mark = &tc->mark;
const char *const files[] = {fname, TEST_APP};
tst_res(TINFO, "Test #%d: %s", n, tc->tname);
if (exec_events_unsupported && ((tc->mask & FAN_OPEN_EXEC) ||
tc->ignore_mask & FAN_OPEN_EXEC)) {
tst_res(TCONF, "FAN_OPEN_EXEC not supported in kernel?");
return -1;
}
fd_notify = SAFE_FANOTIFY_INIT(FAN_CLASS_NOTIF, O_RDONLY);
for (; i < ARRAY_SIZE(files); i++) {
/* Setup normal mark on object */
SAFE_FANOTIFY_MARK(fd_notify, FAN_MARK_ADD | mark->flag,
tc->mask, AT_FDCWD, files[i]);
/* Setup ignore mark on object */
if (tc->ignore_mask) {
SAFE_FANOTIFY_MARK(fd_notify, FAN_MARK_ADD | mark->flag
| FAN_MARK_IGNORED_MASK,
tc->ignore_mask, AT_FDCWD,
files[i]);
}
}
return 0;
}
static void do_test(unsigned int n)
{
int len = 0, event_num = 0;
struct test_case_t *tc = &test_cases[n];
struct fanotify_event_metadata *event;
/* Place a mark on the object */
if (setup_mark(n) != 0)
goto cleanup;
/* Generate events in child process */
if (!generate_events())
goto cleanup;
/* Read available events into buffer */
len = SAFE_READ(0, fd_notify, event_buf, EVENT_BUF_LEN);
event = (struct fanotify_event_metadata *) event_buf;
/* Process events */
while (FAN_EVENT_OK(event, len) && event_num < tc->event_count) {
if (event->mask != *(tc->event_set + event_num)) {
tst_res(TFAIL,
"Received event: mask=%llx (expected %llx, "
"pid=%u, fd=%d",
(unsigned long long) event->mask,
*(tc->event_set + event_num),
(unsigned int) event->pid,
event->fd);
} else if (event->pid != child_pid) {
tst_res(TFAIL,
"Received event: mask=%llx, pid=%u (expected "
"%u), fd=%d",
(unsigned long long) event->mask,
(unsigned int) event->pid,
(unsigned int) child_pid,
event->fd);
} else {
tst_res(TPASS,
"Received event: mask=%llx, pid=%u, fd=%d",
(unsigned long long) event->mask,
(unsigned int) event->pid,
event->fd);
}
if (event->fd != FAN_NOFD)
SAFE_CLOSE(event->fd);
event_num++;
event = FAN_EVENT_NEXT(event, len);
}
cleanup:
if (fd_notify > 0)
SAFE_CLOSE(fd_notify);
}
static void do_setup(void)
{
exec_events_unsupported = fanotify_events_supported_by_kernel(FAN_OPEN_EXEC,
FAN_CLASS_NOTIF, 0);
sprintf(fname, "fname_%d", getpid());
SAFE_FILE_PRINTF(fname, "1");
}
static void do_cleanup(void)
{
if (fd_notify > 0)
SAFE_CLOSE(fd_notify);
}
static struct tst_test test = {
.setup = do_setup,
.test = do_test,
.tcnt = ARRAY_SIZE(test_cases),
.cleanup = do_cleanup,
.forks_child = 1,
.needs_root = 1,
.resource_files = (const char *const []) {
TEST_APP,
NULL
}
};
#else
TST_TEST_TCONF("System does not contain required fanotify support");
#endif
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