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| 1 | +// SPDX-License-Identifier: GPL-2.0 |
| 2 | + |
| 3 | +/* |
| 4 | + * Copyright (c) 2025, Google LLC. |
| 5 | + * Pasha Tatashin <pasha.tatashin@soleen.com> |
| 6 | + */ |
| 7 | + |
| 8 | +#define pr_fmt(fmt) KBUILD_MODNAME " test: " fmt |
| 9 | + |
| 10 | +#include <linux/cleanup.h> |
| 11 | +#include <linux/errno.h> |
| 12 | +#include <linux/init.h> |
| 13 | +#include <linux/liveupdate.h> |
| 14 | +#include <linux/module.h> |
| 15 | +#include "../../kernel/liveupdate/luo_internal.h" |
| 16 | + |
| 17 | +static const struct liveupdate_flb_ops test_flb_ops; |
| 18 | +#define DEFINE_TEST_FLB(i) { \ |
| 19 | + .ops = &test_flb_ops, \ |
| 20 | + .compatible = LIVEUPDATE_TEST_FLB_COMPATIBLE(i), \ |
| 21 | +} |
| 22 | + |
| 23 | +/* Number of Test FLBs to register with every file handler */ |
| 24 | +#define TEST_NFLBS 3 |
| 25 | +static struct liveupdate_flb test_flbs[TEST_NFLBS] = { |
| 26 | + DEFINE_TEST_FLB(0), |
| 27 | + DEFINE_TEST_FLB(1), |
| 28 | + DEFINE_TEST_FLB(2), |
| 29 | +}; |
| 30 | + |
| 31 | +#define TEST_FLB_MAGIC_BASE 0xFEEDF00DCAFEBEE0ULL |
| 32 | + |
| 33 | +static int test_flb_preserve(struct liveupdate_flb_op_args *argp) |
| 34 | +{ |
| 35 | + ptrdiff_t index = argp->flb - test_flbs; |
| 36 | + |
| 37 | + pr_info("%s: preserve was triggered\n", argp->flb->compatible); |
| 38 | + argp->data = TEST_FLB_MAGIC_BASE + index; |
| 39 | + |
| 40 | + return 0; |
| 41 | +} |
| 42 | + |
| 43 | +static void test_flb_unpreserve(struct liveupdate_flb_op_args *argp) |
| 44 | +{ |
| 45 | + pr_info("%s: unpreserve was triggered\n", argp->flb->compatible); |
| 46 | +} |
| 47 | + |
| 48 | +static int test_flb_retrieve(struct liveupdate_flb_op_args *argp) |
| 49 | +{ |
| 50 | + ptrdiff_t index = argp->flb - test_flbs; |
| 51 | + u64 expected_data = TEST_FLB_MAGIC_BASE + index; |
| 52 | + |
| 53 | + if (argp->data == expected_data) { |
| 54 | + pr_info("%s: found flb data from the previous boot\n", |
| 55 | + argp->flb->compatible); |
| 56 | + argp->obj = (void *)argp->data; |
| 57 | + } else { |
| 58 | + pr_err("%s: ERROR - incorrect data handle: %llx, expected %llx\n", |
| 59 | + argp->flb->compatible, argp->data, expected_data); |
| 60 | + return -EINVAL; |
| 61 | + } |
| 62 | + |
| 63 | + return 0; |
| 64 | +} |
| 65 | + |
| 66 | +static void test_flb_finish(struct liveupdate_flb_op_args *argp) |
| 67 | +{ |
| 68 | + ptrdiff_t index = argp->flb - test_flbs; |
| 69 | + void *expected_obj = (void *)(TEST_FLB_MAGIC_BASE + index); |
| 70 | + |
| 71 | + if (argp->obj == expected_obj) { |
| 72 | + pr_info("%s: finish was triggered\n", argp->flb->compatible); |
| 73 | + } else { |
| 74 | + pr_err("%s: ERROR - finish called with invalid object\n", |
| 75 | + argp->flb->compatible); |
| 76 | + } |
| 77 | +} |
| 78 | + |
| 79 | +static const struct liveupdate_flb_ops test_flb_ops = { |
| 80 | + .preserve = test_flb_preserve, |
| 81 | + .unpreserve = test_flb_unpreserve, |
| 82 | + .retrieve = test_flb_retrieve, |
| 83 | + .finish = test_flb_finish, |
| 84 | + .owner = THIS_MODULE, |
| 85 | +}; |
| 86 | + |
| 87 | +static void liveupdate_test_init(void) |
| 88 | +{ |
| 89 | + static DEFINE_MUTEX(init_lock); |
| 90 | + static bool initialized; |
| 91 | + int i; |
| 92 | + |
| 93 | + guard(mutex)(&init_lock); |
| 94 | + |
| 95 | + if (initialized) |
| 96 | + return; |
| 97 | + |
| 98 | + for (i = 0; i < TEST_NFLBS; i++) { |
| 99 | + struct liveupdate_flb *flb = &test_flbs[i]; |
| 100 | + void *obj; |
| 101 | + int err; |
| 102 | + |
| 103 | + err = liveupdate_flb_get_incoming(flb, &obj); |
| 104 | + if (err && err != -ENODATA && err != -ENOENT) { |
| 105 | + pr_err("liveupdate_flb_get_incoming for %s failed: %pe\n", |
| 106 | + flb->compatible, ERR_PTR(err)); |
| 107 | + } |
| 108 | + } |
| 109 | + initialized = true; |
| 110 | +} |
| 111 | + |
| 112 | +void liveupdate_test_register(struct liveupdate_file_handler *fh) |
| 113 | +{ |
| 114 | + int err, i; |
| 115 | + |
| 116 | + liveupdate_test_init(); |
| 117 | + |
| 118 | + for (i = 0; i < TEST_NFLBS; i++) { |
| 119 | + struct liveupdate_flb *flb = &test_flbs[i]; |
| 120 | + |
| 121 | + err = liveupdate_register_flb(fh, flb); |
| 122 | + if (err) { |
| 123 | + pr_err("Failed to register %s %pe\n", |
| 124 | + flb->compatible, ERR_PTR(err)); |
| 125 | + } |
| 126 | + } |
| 127 | + |
| 128 | + err = liveupdate_register_flb(fh, &test_flbs[0]); |
| 129 | + if (!err || err != -EEXIST) { |
| 130 | + pr_err("Failed: %s should be already registered, but got err: %pe\n", |
| 131 | + test_flbs[0].compatible, ERR_PTR(err)); |
| 132 | + } |
| 133 | + |
| 134 | + pr_info("Registered %d FLBs with file handler: [%s]\n", |
| 135 | + TEST_NFLBS, fh->compatible); |
| 136 | +} |
| 137 | + |
| 138 | +void liveupdate_test_unregister(struct liveupdate_file_handler *fh) |
| 139 | +{ |
| 140 | + int err, i; |
| 141 | + |
| 142 | + for (i = 0; i < TEST_NFLBS; i++) { |
| 143 | + struct liveupdate_flb *flb = &test_flbs[i]; |
| 144 | + |
| 145 | + err = liveupdate_unregister_flb(fh, flb); |
| 146 | + if (err) { |
| 147 | + pr_err("Failed to unregister %s %pe\n", |
| 148 | + flb->compatible, ERR_PTR(err)); |
| 149 | + } |
| 150 | + } |
| 151 | + |
| 152 | + pr_info("Unregistered %d FLBs from file handler: [%s]\n", |
| 153 | + TEST_NFLBS, fh->compatible); |
| 154 | +} |
| 155 | + |
| 156 | +MODULE_LICENSE("GPL"); |
| 157 | +MODULE_AUTHOR("Pasha Tatashin <pasha.tatashin@soleen.com>"); |
| 158 | +MODULE_DESCRIPTION("In-kernel test for LUO mechanism"); |
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