fanotify20 is a new test validating the FAN_FS_ERROR file system error event. This adds some basic structure for the next patches. The strategy for error reporting testing in fanotify20 goes like this: - Generate a broken filesystem - Start FAN_FS_ERROR monitoring group - Make the file system notice the error through ordinary operations - Observe the event generated Signed-off-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx> --- testcases/kernel/syscalls/fanotify/.gitignore | 1 + .../kernel/syscalls/fanotify/fanotify20.c | 135 ++++++++++++++++++ 2 files changed, 136 insertions(+) create mode 100644 testcases/kernel/syscalls/fanotify/fanotify20.c diff --git a/testcases/kernel/syscalls/fanotify/.gitignore b/testcases/kernel/syscalls/fanotify/.gitignore index 9554b16b196e..c99e6fff76d6 100644 --- a/testcases/kernel/syscalls/fanotify/.gitignore +++ b/testcases/kernel/syscalls/fanotify/.gitignore @@ -17,4 +17,5 @@ /fanotify17 /fanotify18 /fanotify19 +/fanotify20 /fanotify_child diff --git a/testcases/kernel/syscalls/fanotify/fanotify20.c b/testcases/kernel/syscalls/fanotify/fanotify20.c new file mode 100644 index 000000000000..50531bd99cc9 --- /dev/null +++ b/testcases/kernel/syscalls/fanotify/fanotify20.c @@ -0,0 +1,135 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2021 Collabora Ltd. + * + * Author: Gabriel Krisman Bertazi <gabriel@xxxxxxxxxx> + * Based on previous work by Amir Goldstein <amir73il@xxxxxxxxx> + */ + +/*\ + * [Description] + * Check fanotify FAN_ERROR_FS events triggered by intentionally + * corrupted filesystems: + * + * - Generate a broken filesystem + * - Start FAN_FS_ERROR monitoring group + * - Make the file system notice the error through ordinary operations + * - Observe the event generated + */ + +#define _GNU_SOURCE +#include "config.h" + +#include <stdio.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <errno.h> +#include <string.h> +#include <sys/mount.h> +#include <sys/syscall.h> +#include "tst_test.h" +#include <sys/fanotify.h> +#include <sys/types.h> +#include <fcntl.h> + +#ifdef HAVE_SYS_FANOTIFY_H +#include "fanotify.h" + +#ifndef FAN_FS_ERROR +#define FAN_FS_ERROR 0x00008000 +#endif + +#define BUF_SIZE 256 +static char event_buf[BUF_SIZE]; +int fd_notify; + +#define MOUNT_PATH "test_mnt" + +static const struct test_case { + char *name; + void (*trigger_error)(void); + void (*prepare_fs)(void); +} testcases[] = { +}; + +int check_error_event_metadata(struct fanotify_event_metadata *event) +{ + int fail = 0; + + if (event->mask != FAN_FS_ERROR) { + fail++; + tst_res(TFAIL, "got unexpected event %llx", + (unsigned long long)event->mask); + } + + if (event->fd != FAN_NOFD) { + fail++; + tst_res(TFAIL, "Weird FAN_FD %llx", + (unsigned long long)event->mask); + } + return fail; +} + +void check_event(char *buf, size_t len, const struct test_case *ex) +{ + struct fanotify_event_metadata *event = + (struct fanotify_event_metadata *) buf; + + if (len < FAN_EVENT_METADATA_LEN) + tst_res(TFAIL, "No event metadata found"); + + if (check_error_event_metadata(event)) + return; + + tst_res(TPASS, "Successfully received: %s", ex->name); +} + +static void do_test(unsigned int i) +{ + const struct test_case *tcase = &testcases[i]; + size_t read_len; + + tcase->trigger_error(); + + read_len = SAFE_READ(0, fd_notify, event_buf, BUF_SIZE); + + check_event(event_buf, read_len, tcase); +} + +static void setup(void) +{ + unsigned long i; + + for (i = 0; i < ARRAY_SIZE(testcases); i++) + if (testcases[i].prepare_fs) + testcases[i].prepare_fs(); + + fd_notify = SAFE_FANOTIFY_INIT(FAN_CLASS_NOTIF|FAN_REPORT_FID, + O_RDONLY); + + SAFE_FANOTIFY_MARK(fd_notify, FAN_MARK_ADD|FAN_MARK_FILESYSTEM, + FAN_FS_ERROR, AT_FDCWD, MOUNT_PATH); +} + +static void cleanup(void) +{ + if (fd_notify > 0) + SAFE_CLOSE(fd_notify); +} + +static struct tst_test test = { + .test = do_test, + .tcnt = ARRAY_SIZE(testcases), + .setup = setup, + .cleanup = cleanup, + .mount_device = 1, + .mntpoint = MOUNT_PATH, + .all_filesystems = 0, + .needs_root = 1, + .dev_fs_type = "ext4" + +}; + +#else + TST_TEST_TCONF("system doesn't have required fanotify support"); +#endif -- 2.32.0