luo_kexec_simple.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2
 3/*
 4 * Copyright (c) 2025, Google LLC.
 5 * Pasha Tatashin <pasha.tatashin@soleen.com>
 6 *
 7 * A simple selftest to validate the end-to-end lifecycle of a LUO session
 8 * across a single kexec reboot.
 9 */
10
11#include "luo_test_utils.h"
12
13#define TEST_SESSION_NAME "test-session"
14#define TEST_MEMFD_TOKEN 0x1A
15#define TEST_MEMFD_DATA "hello kexec world"
16
17/* Constants for the state-tracking mechanism, specific to this test file. */
18#define STATE_SESSION_NAME "kexec_simple_state"
19#define STATE_MEMFD_TOKEN 999
20
21/* Stage 1: Executed before the kexec reboot. */
22static void run_stage_1(int luo_fd)
23{
24	int session_fd;
25
26	ksft_print_msg("[STAGE 1] Starting pre-kexec setup...\n");
27
28	ksft_print_msg("[STAGE 1] Creating state file for next stage (2)...\n");
29	create_state_file(luo_fd, STATE_SESSION_NAME, STATE_MEMFD_TOKEN, 2);
30
31	ksft_print_msg("[STAGE 1] Creating session '%s' and preserving memfd...\n",
32		       TEST_SESSION_NAME);
33	session_fd = luo_create_session(luo_fd, TEST_SESSION_NAME);
34	if (session_fd < 0)
35		fail_exit("luo_create_session for '%s'", TEST_SESSION_NAME);
36
37	if (create_and_preserve_memfd(session_fd, TEST_MEMFD_TOKEN,
38				      TEST_MEMFD_DATA) < 0) {
39		fail_exit("create_and_preserve_memfd for token %#x",
40			  TEST_MEMFD_TOKEN);
41	}
42
43	close(luo_fd);
44	daemonize_and_wait();
45}
46
47/* Stage 2: Executed after the kexec reboot. */
48static void run_stage_2(int luo_fd, int state_session_fd)
49{
50	int session_fd, mfd, stage;
51
52	ksft_print_msg("[STAGE 2] Starting post-kexec verification...\n");
53
54	restore_and_read_stage(state_session_fd, STATE_MEMFD_TOKEN, &stage);
55	if (stage != 2)
56		fail_exit("Expected stage 2, but state file contains %d", stage);
57
58	ksft_print_msg("[STAGE 2] Retrieving session '%s'...\n", TEST_SESSION_NAME);
59	session_fd = luo_retrieve_session(luo_fd, TEST_SESSION_NAME);
60	if (session_fd < 0)
61		fail_exit("luo_retrieve_session for '%s'", TEST_SESSION_NAME);
62
63	ksft_print_msg("[STAGE 2] Restoring and verifying memfd (token %#x)...\n",
64		       TEST_MEMFD_TOKEN);
65	mfd = restore_and_verify_memfd(session_fd, TEST_MEMFD_TOKEN,
66				       TEST_MEMFD_DATA);
67	if (mfd < 0)
68		fail_exit("restore_and_verify_memfd for token %#x", TEST_MEMFD_TOKEN);
69	close(mfd);
70
71	ksft_print_msg("[STAGE 2] Test data verified successfully.\n");
72	ksft_print_msg("[STAGE 2] Finalizing test session...\n");
73	if (luo_session_finish(session_fd) < 0)
74		fail_exit("luo_session_finish for test session");
75	close(session_fd);
76
77	ksft_print_msg("[STAGE 2] Finalizing state session...\n");
78	if (luo_session_finish(state_session_fd) < 0)
79		fail_exit("luo_session_finish for state session");
80	close(state_session_fd);
81
82	ksft_print_msg("\n--- SIMPLE KEXEC TEST PASSED ---\n");
83}
84
85int main(int argc, char *argv[])
86{
87	return luo_test(argc, argv, STATE_SESSION_NAME,
88			run_stage_1, run_stage_2);
89}