306 lines
7.3 KiB
C
306 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2021 Google. All Rights Reserved.
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*
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* Started by Matthew Bobrowski <repnop@google.com>
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*/
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/*\
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* [Description]
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*
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* A test which verifies whether the returned struct
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* fanotify_event_info_pidfd in FAN_REPORT_PIDFD mode contains the
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* expected set of information.
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*
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* NOTE: FAN_REPORT_PIDFD support was added in v5.15-rc1 in af579beb666a
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* ("fanotify: add pidfd support to the fanotify API").
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include "tst_test.h"
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#include "tst_safe_stdio.h"
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#include "tst_safe_macros.h"
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#include "lapi/pidfd.h"
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#ifdef HAVE_SYS_FANOTIFY_H
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#include "fanotify.h"
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#define BUF_SZ 4096
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#define MOUNT_PATH "fs_mnt"
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#define TEST_FILE MOUNT_PATH "/testfile"
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static struct pidfd_fdinfo_t {
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int pos;
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int flags;
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int mnt_id;
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int pid;
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int ns_pid;
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};
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static struct test_case_t {
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char *name;
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int fork;
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int want_pidfd_err;
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} test_cases[] = {
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{
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"return a valid pidfd for event created by self",
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0,
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0,
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},
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{
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"return invalid pidfd for event created by terminated child",
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1,
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FAN_NOPIDFD,
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},
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};
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static int fanotify_fd;
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static char event_buf[BUF_SZ];
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static struct pidfd_fdinfo_t *self_pidfd_fdinfo;
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static struct pidfd_fdinfo_t *read_pidfd_fdinfo(int pidfd)
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{
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char *fdinfo_path;
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struct pidfd_fdinfo_t *pidfd_fdinfo;
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pidfd_fdinfo = SAFE_MALLOC(sizeof(struct pidfd_fdinfo_t));
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SAFE_ASPRINTF(&fdinfo_path, "/proc/self/fdinfo/%d", pidfd);
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SAFE_FILE_LINES_SCANF(fdinfo_path, "pos: %d", &pidfd_fdinfo->pos);
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SAFE_FILE_LINES_SCANF(fdinfo_path, "flags: %d", &pidfd_fdinfo->flags);
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SAFE_FILE_LINES_SCANF(fdinfo_path, "mnt_id: %d", &pidfd_fdinfo->mnt_id);
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SAFE_FILE_LINES_SCANF(fdinfo_path, "Pid: %d", &pidfd_fdinfo->pid);
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SAFE_FILE_LINES_SCANF(fdinfo_path, "NSpid: %d", &pidfd_fdinfo->ns_pid);
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free(fdinfo_path);
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return pidfd_fdinfo;
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}
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static void generate_event(void)
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{
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int fd;
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/* Generate a single FAN_OPEN event on the watched object. */
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fd = SAFE_OPEN(TEST_FILE, O_RDONLY);
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SAFE_CLOSE(fd);
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}
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static void do_fork(void)
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{
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int status;
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pid_t child;
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child = SAFE_FORK();
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if (child == 0) {
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SAFE_CLOSE(fanotify_fd);
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generate_event();
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exit(EXIT_SUCCESS);
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}
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SAFE_WAITPID(child, &status, 0);
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if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
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tst_brk(TBROK,
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"child process terminated incorrectly");
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}
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static void do_setup(void)
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{
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int pidfd;
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SAFE_TOUCH(TEST_FILE, 0666, NULL);
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/*
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* An explicit check for FAN_REPORT_PIDFD is performed early
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* on in the test initialization as it's a prerequisite for
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* all test cases.
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*/
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REQUIRE_FANOTIFY_INIT_FLAGS_SUPPORTED_BY_KERNEL(FAN_REPORT_PIDFD);
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fanotify_fd = SAFE_FANOTIFY_INIT(FAN_REPORT_PIDFD, O_RDONLY);
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SAFE_FANOTIFY_MARK(fanotify_fd, FAN_MARK_ADD, FAN_OPEN, AT_FDCWD,
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TEST_FILE);
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pidfd = SAFE_PIDFD_OPEN(getpid(), 0);
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self_pidfd_fdinfo = read_pidfd_fdinfo(pidfd);
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if (self_pidfd_fdinfo == NULL) {
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tst_brk(TBROK,
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"pidfd=%d, failed to read pidfd fdinfo",
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pidfd);
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}
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}
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static void do_test(unsigned int num)
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{
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int i = 0, len;
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struct test_case_t *tc = &test_cases[num];
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tst_res(TINFO, "Test #%d: %s", num, tc->name);
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/*
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* Generate the event in either self or a child process. Event
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* generation in a child process is done so that the FAN_NOPIDFD case
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* can be verified.
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*/
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if (tc->fork)
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do_fork();
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else
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generate_event();
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/*
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* Read all of the queued events into the provided event
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* buffer.
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*/
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len = SAFE_READ(0, fanotify_fd, event_buf, sizeof(event_buf));
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while (i < len) {
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struct fanotify_event_metadata *event;
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struct fanotify_event_info_pidfd *info;
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struct pidfd_fdinfo_t *event_pidfd_fdinfo = NULL;
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event = (struct fanotify_event_metadata *)&event_buf[i];
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info = (struct fanotify_event_info_pidfd *)(event + 1);
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/*
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* Checks ensuring that pidfd information record object header
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* fields are set correctly.
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*/
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if (info->hdr.info_type != FAN_EVENT_INFO_TYPE_PIDFD) {
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tst_res(TFAIL,
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"unexpected info_type received in info "
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"header (expected: %d, got: %d",
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FAN_EVENT_INFO_TYPE_PIDFD,
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info->hdr.info_type);
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info = NULL;
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goto next_event;
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} else if (info->hdr.len !=
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sizeof(struct fanotify_event_info_pidfd)) {
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tst_res(TFAIL,
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"unexpected info object length "
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"(expected: %lu, got: %d",
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sizeof(struct fanotify_event_info_pidfd),
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info->hdr.len);
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info = NULL;
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goto next_event;
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}
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/*
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* Check if pidfd information object reported any errors during
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* creation and whether they're expected.
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*/
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if (info->pidfd < 0 && !tc->want_pidfd_err) {
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tst_res(TFAIL,
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"pidfd creation failed for pid: %u with pidfd error value "
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"set to: %d",
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(unsigned int)event->pid,
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info->pidfd);
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goto next_event;
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} else if (tc->want_pidfd_err &&
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info->pidfd != tc->want_pidfd_err) {
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tst_res(TFAIL,
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"pidfd set to an unexpected error: %d for pid: %u",
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info->pidfd,
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(unsigned int)event->pid);
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goto next_event;
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} else if (tc->want_pidfd_err &&
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info->pidfd == tc->want_pidfd_err) {
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tst_res(TPASS,
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"pid: %u terminated before pidfd was created, "
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"pidfd set to the value of: %d, as expected",
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(unsigned int)event->pid,
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FAN_NOPIDFD);
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goto next_event;
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}
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/*
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* No pidfd errors occurred, continue with verifying pidfd
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* fdinfo validity.
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*/
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event_pidfd_fdinfo = read_pidfd_fdinfo(info->pidfd);
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if (event_pidfd_fdinfo == NULL) {
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tst_brk(TBROK,
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"reading fdinfo for pidfd: %d "
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"describing pid: %u failed",
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info->pidfd,
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(unsigned int)event->pid);
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goto next_event;
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} else if (event_pidfd_fdinfo->pid != event->pid) {
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tst_res(TFAIL,
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"pidfd provided for incorrect pid "
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"(expected pidfd for pid: %u, got pidfd for "
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"pid: %u)",
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(unsigned int)event->pid,
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(unsigned int)event_pidfd_fdinfo->pid);
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goto next_event;
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} else if (memcmp(event_pidfd_fdinfo, self_pidfd_fdinfo,
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sizeof(struct pidfd_fdinfo_t))) {
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tst_res(TFAIL,
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"pidfd fdinfo values for self and event differ "
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"(expected pos: %d, flags: %x, mnt_id: %d, "
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"pid: %d, ns_pid: %d, got pos: %d, "
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"flags: %x, mnt_id: %d, pid: %d, ns_pid: %d",
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self_pidfd_fdinfo->pos,
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self_pidfd_fdinfo->flags,
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self_pidfd_fdinfo->mnt_id,
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self_pidfd_fdinfo->pid,
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self_pidfd_fdinfo->ns_pid,
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event_pidfd_fdinfo->pos,
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event_pidfd_fdinfo->flags,
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event_pidfd_fdinfo->mnt_id,
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event_pidfd_fdinfo->pid,
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event_pidfd_fdinfo->ns_pid);
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goto next_event;
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} else {
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tst_res(TPASS,
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"got an event with a valid pidfd info record, "
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"mask: %lld, pid: %u, fd: %d, "
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"pidfd: %d, info_type: %d, info_len: %d",
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(unsigned long long)event->mask,
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(unsigned int)event->pid,
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event->fd,
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info->pidfd,
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info->hdr.info_type,
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info->hdr.len);
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}
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next_event:
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i += event->event_len;
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if (event->fd >= 0)
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SAFE_CLOSE(event->fd);
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if (info && info->pidfd >= 0)
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SAFE_CLOSE(info->pidfd);
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if (event_pidfd_fdinfo)
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free(event_pidfd_fdinfo);
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}
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}
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static void do_cleanup(void)
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{
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if (fanotify_fd >= 0)
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SAFE_CLOSE(fanotify_fd);
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if (self_pidfd_fdinfo)
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free(self_pidfd_fdinfo);
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}
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static struct tst_test test = {
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.setup = do_setup,
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.test = do_test,
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.tcnt = ARRAY_SIZE(test_cases),
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.cleanup = do_cleanup,
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.all_filesystems = 1,
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.needs_root = 1,
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.mntpoint = MOUNT_PATH,
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.forks_child = 1,
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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 /* HAVE_SYS_FANOTIFY_H */
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