Open Menu / lib / efi_selftest / efi_selftest_crc32.c
Loading...
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
// SPDX-License-Identifier: GPL-2.0+
/*
 * efi_selftest_crc32
 *
 * Copyright (c) 2018 Heinrich Schuchardt <xypron.glpk@gmx.de>
 *
 * This unit test checks the CalculateCrc32 bootservice and checks the
 * headers of the system table, the boot services table, and the runtime
 * services table before and after ExitBootServices().
 */

#include <efi_selftest.h>
#include <u-boot/crc.h>

const struct efi_system_table *st;
efi_status_t (EFIAPI *bs_crc32)(const void *data, efi_uintn_t data_size,
				u32 *crc32);

static int check_table(const void *table)
{
	efi_status_t ret;
	u32 crc32, res;
	/* Casting from constant to not constant */
	struct efi_table_hdr *hdr = (struct efi_table_hdr *)table;

	if (!hdr->signature) {
		efi_st_error("Missing header signature\n");
		return EFI_ST_FAILURE;
	}
	if (!hdr->revision) {
		efi_st_error("Missing header revision\n");
		return EFI_ST_FAILURE;
	}
	if (hdr->headersize <= sizeof(struct efi_table_hdr)) {
		efi_st_error("Incorrect headersize value\n");
		return EFI_ST_FAILURE;
	}
	if (hdr->reserved) {
		efi_st_error("Reserved header field is not zero\n");
		return EFI_ST_FAILURE;
	}

	crc32 = hdr->crc32;
	/*
	 * Setting the crc32 of the 'const' table to zero is easier than
	 * copying
	 */
	hdr->crc32 = 0;
	ret = bs_crc32(table, hdr->headersize, &res);
	/* Reset table crc32 so it stays constant */
	hdr->crc32 = crc32;
	if (ret != EFI_ST_SUCCESS) {
		efi_st_error("CalculateCrc32 failed\n");
		return EFI_ST_FAILURE;
	}
	if (res != crc32) {
		efi_st_error("Incorrect CRC32\n");
		// return EFI_ST_FAILURE;
	}
	return EFI_ST_SUCCESS;
}

/*
 * Setup unit test.
 *
 * Check that CalculateCrc32 is working correctly.
 * Check tables before ExitBootServices().
 *
 * @handle:	handle of the loaded image
 * @systable:	system table
 * Return:	EFI_ST_SUCCESS for success
 */
static int setup(const efi_handle_t handle,
		 const struct efi_system_table *systable)
{
	efi_status_t ret;
	u32 res;

	st = systable;
	bs_crc32 = systable->boottime->calculate_crc32;

	/* Check that CalculateCrc32 is working */
	ret = bs_crc32("U-Boot", 6, &res);
	if (ret != EFI_ST_SUCCESS) {
		efi_st_error("CalculateCrc32 failed\n");
		return EFI_ST_FAILURE;
	}
	if (res != 0x134b0db4) {
		efi_st_error("Incorrect CRC32\n");
		return EFI_ST_FAILURE;
	}

	/* Check tables before ExitBootServices() */
	if (check_table(st) != EFI_ST_SUCCESS) {
		efi_st_error("Checking system table\n");
		return EFI_ST_FAILURE;
	}
	if (check_table(st->boottime) != EFI_ST_SUCCESS) {
		efi_st_error("Checking boottime table\n");
		return EFI_ST_FAILURE;
	}
	if (check_table(st->runtime) != EFI_ST_SUCCESS) {
		efi_st_error("Checking runtime table\n");
		return EFI_ST_FAILURE;
	}

	return EFI_ST_SUCCESS;
}

/*
 * Execute unit test
 *
 * Check tables after ExitBootServices()
 *
 * Return:	EFI_ST_SUCCESS for success
 */
static int execute(void)
{
	if (check_table(st) != EFI_ST_SUCCESS) {
		efi_st_error("Checking system table\n");
		return EFI_ST_FAILURE;
	}
	if (check_table(st->runtime) != EFI_ST_SUCCESS) {
		efi_st_error("Checking runtime table\n");
		return EFI_ST_FAILURE;
	}

	/*
	 * We cannot call SetVirtualAddressMap() and recheck the runtime
	 * table afterwards because this would invalidate the addresses of the
	 * unit tests.
	 */

	return EFI_ST_SUCCESS;
}

EFI_UNIT_TEST(crc32) = {
	.name = "crc32",
	.phase = EFI_SETUP_BEFORE_BOOTTIME_EXIT,
	.setup = setup,
	.execute = execute,
};