tests: Add lib/cbfs-verification-test test case

This commit adds test case for lib/cbfs verification mechanisms.

Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Change-Id: I1d8cbb1c2d0a9db3236de065428b70a9c2a66330
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56601
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Jakub Czapiga 2021-07-22 08:52:46 +02:00 committed by Julius Werner
parent 6813d561b2
commit 6f3fd6358f
5 changed files with 392 additions and 0 deletions

View File

@ -0,0 +1,102 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef TESTS_LIB_CBFS_UTIL_H
#define TESTS_LIB_CBFS_UTIL_H
#include <cbfs.h>
#include <symbols.h>
#include <tests/test.h>
#define BE32(be32) EMPTY_WRAP(\
((be32) >> 24) & 0xff, ((be32) >> 16) & 0xff, \
((be32) >> 8) & 0xff, ((be32) >> 0) & 0xff)
#define BE64(be64) EMPTY_WRAP( \
BE32(((be64) >> 32) & 0xFFFFFFFF), \
BE32(((be64) >> 0) & 0xFFFFFFFF))
#define FILENAME_SIZE 16
struct cbfs_test_file {
struct cbfs_file header;
u8 filename[FILENAME_SIZE];
u8 attrs_and_data[200];
};
#define TEST_CBFS_CACHE_SIZE (2 * MiB)
#define TEST_MCACHE_SIZE (2 * MiB)
#define HEADER_INITIALIZER(ftype, attr_len, file_len) { \
.magic = CBFS_FILE_MAGIC, \
.len = cpu_to_be32(file_len), \
.type = cpu_to_be32(ftype), \
.attributes_offset = \
cpu_to_be32(attr_len ? sizeof(struct cbfs_file) + FILENAME_SIZE : 0), \
.offset = cpu_to_be32(sizeof(struct cbfs_file) + FILENAME_SIZE + attr_len), \
}
#define HASH_ATTR_SIZE (offsetof(struct cbfs_file_attr_hash, hash.raw) + VB2_SHA256_DIGEST_SIZE)
/* This macro basically does nothing but suppresses linter messages */
#define EMPTY_WRAP(...) __VA_ARGS__
#define TEST_DATA_1_FILENAME "test/data/1"
#define TEST_DATA_1_SIZE sizeof((u8[]){TEST_DATA_1})
#define TEST_DATA_1 EMPTY_WRAP( \
'!', '"', '#', '$', '%', '&', '\'', '(', ')', '*', '+', ',', '-', '.', '/', \
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?', '@', \
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', \
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', \
'[', '\\', ']', '^', '_', '`', \
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', \
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z')
#define TEST_DATA_2_FILENAME "test/data/2"
#define TEST_DATA_2_SIZE sizeof((u8[]){TEST_DATA_2})
#define TEST_DATA_2 EMPTY_WRAP( \
0x9d, 0xa9, 0x91, 0xac, 0x5d, 0xb2, 0x70, 0x76, 0x37, 0x94, 0x94, 0xa8, 0x8b, 0x78, \
0xb9, 0xaa, 0x1a, 0x8e, 0x9a, 0x16, 0xbe, 0xdc, 0x29, 0x42, 0x46, 0x58, 0xd4, 0x37, \
0x94, 0xca, 0x05, 0xdb, 0x54, 0xfa, 0xd8, 0x6e, 0x54, 0xd8, 0x30, 0x46, 0x5d, 0x62, \
0xc2, 0xce, 0xd8, 0x74, 0x60, 0xaf, 0x83, 0x8f, 0xfa, 0x97, 0xdd, 0x6e, 0xcb, 0x60, \
0xfa, 0xed, 0x8b, 0x55, 0x9e, 0xc1, 0xc2, 0x18, 0x4f, 0xe2, 0x28, 0x7e, 0xd7, 0x2f, \
0xa2, 0x86, 0xfb, 0x4d, 0x3e, 0x00, 0x5a, 0xf7, 0xc2, 0xad, 0x0e, 0xa7, 0xa2, 0xf7, \
0x38, 0x66, 0xe6, 0x5c, 0x76, 0x98, 0x89, 0x63, 0xeb, 0xc5, 0xf5, 0xb7, 0xa7, 0x58, \
0xe0, 0xf0, 0x2e, 0x2f, 0xb0, 0x95, 0xb7, 0x43, 0x28, 0x19, 0x2d, 0xef, 0x1a, 0xb3, \
0x42, 0x31, 0x55, 0x0f, 0xbc, 0xcd, 0x01, 0xe5, 0x39, 0x18, 0x88, 0x83, 0xb2, 0xc5, \
0x4b, 0x3b, 0x38, 0xe7)
#define TEST_DATA_INT_1_FILENAME "test-int-1"
#define TEST_DATA_INT_1_SIZE 8
#define TEST_DATA_INT_1 0xFEDCBA9876543210ULL
#define TEST_DATA_INT_2_FILENAME "test-int-2"
#define TEST_DATA_INT_2_SIZE 8
#define TEST_DATA_INT_2 0x10FE32DC54A97698ULL
#define TEST_DATA_INT_3_FILENAME "test-int-3"
#define TEST_DATA_INT_3_SIZE 8
#define TEST_DATA_INT_3 0xFA57F003B0036667ULL
#define TEST_SHA256 EMPTY_WRAP( \
0xef, 0xc7, 0xb1, 0x0a, 0xbf, 0x54, 0x2f, 0xaa, 0x12, 0xa6, 0xeb, 0xf, 0xff, 0xf4, \
0x19, 0xc1, 0x63, 0xf4, 0x60, 0x50, 0xc5, 0xb0, 0xbe, 0x37, 0x32, 0x11, 0x19, 0x63, \
0x61, 0xe0, 0x53, 0xe0)
#define INVALID_SHA256 EMPTY_WRAP( \
'T', 'h', 'i', 's', ' ', 'i', 's', ' ', 'n', 'o', 't', ' ', 'a', ' ', \
'v', 'a', 'l', 'i', 'd', ' ', 'S', 'H', 'A', '2', '5', '6', '!', '!', \
'!', '!', '!', '!')
extern const u8 test_data_1[TEST_DATA_1_SIZE];
extern const u8 test_data_2[TEST_DATA_2_SIZE];
extern const u8 test_data_int_1[TEST_DATA_INT_1_SIZE];
extern const u8 test_data_int_2[TEST_DATA_INT_2_SIZE];
extern const u8 test_data_int_3[TEST_DATA_INT_3_SIZE];
extern const u8 good_hash[VB2_SHA256_DIGEST_SIZE];
extern const u8 bad_hash[VB2_SHA256_DIGEST_SIZE];
extern const struct cbfs_test_file file_no_hash;
extern const struct cbfs_test_file file_valid_hash;
extern const struct cbfs_test_file file_broken_hash;
#endif /* TESTS_LIB_CBFS_UTIL_H */

View File

@ -32,6 +32,10 @@ tests-y += spd_cache-ddr3-test
tests-y += spd_cache-ddr4-test tests-y += spd_cache-ddr4-test
tests-y += cbmem_stage_cache-test tests-y += cbmem_stage_cache-test
tests-y += libgcc-test tests-y += libgcc-test
tests-y += cbfs-verification-no-sha512-test
tests-y += cbfs-verification-has-sha512-test
tests-y += cbfs-no-verification-no-sha512-test
tests-y += cbfs-no-verification-has-sha512-test
string-test-srcs += tests/lib/string-test.c string-test-srcs += tests/lib/string-test.c
string-test-srcs += src/lib/string.c string-test-srcs += src/lib/string.c
@ -176,3 +180,31 @@ cbmem_stage_cache-test-srcs += src/lib/imd.c
cbmem_stage_cache-test-config += CONFIG_CBMEM_STAGE_CACHE=1 cbmem_stage_cache-test-config += CONFIG_CBMEM_STAGE_CACHE=1
libgcc-test-srcs += tests/lib/libgcc-test.c libgcc-test-srcs += tests/lib/libgcc-test.c
# CBFS varification tests are compiled with CONFIG_CBFS_VERIFICATION
# and VB2_SUPPORT_SHA512 set and unset. Code should work with and without
# verification and with hash structure of different sizes.
cbfs-verification-no-sha512-test-stage := bootblock
cbfs-verification-no-sha512-test-srcs := tests/lib/cbfs-verification-test.c \
tests/stubs/console.c \
tests/stubs/die.c \
tests/mock/cbfs_file_mock.c \
src/lib/cbfs.c \
src/commonlib/bsd/cbfs_private.c \
src/commonlib/mem_pool.c \
src/commonlib/region.c
cbfs-verification-no-sha512-test-mocks += cbfs_get_boot_device cbfs_lookup
cbfs-verification-no-sha512-test-config += CONFIG_COLLECT_TIMESTAMPS=0 \
CONFIG_CBFS_VERIFICATION=1 \
CONFIG_NO_CBFS_MCACHE=1 \
VB2_SUPPORT_SHA512=0
$(call copy-test,cbfs-verification-no-sha512-test,cbfs-verification-has-sha512-test)
cbfs-verification-has-sha512-test-config += VB2_SUPPORT_SHA512=1
$(call copy-test,cbfs-verification-no-sha512-test,cbfs-no-verification-no-sha512-test)
cbfs-no-verification-no-sha512-test-config += CONFIG_CBFS_VERIFICATION=0
$(call copy-test,cbfs-verification-no-sha512-test,cbfs-no-verification-has-sha512-test)
cbfs-no-verification-has-sha512-test-config += CONFIG_CBFS_VERIFICATION=0 \
VB2_SUPPORT_SHA512=1

View File

@ -0,0 +1,196 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <cbfs.h>
#include <commonlib/region.h>
#include <string.h>
#include <tests/lib/cbfs_util.h>
#include <tests/test.h>
/* Mocks */
static struct cbfs_boot_device cbd;
const struct cbfs_boot_device *cbfs_get_boot_device(bool force_ro)
{
check_expected(force_ro);
return &cbd;
}
size_t vb2_digest_size(enum vb2_hash_algorithm hash_alg)
{
if (hash_alg != VB2_HASH_SHA256) {
fail_msg("Unsupported hash algorithm: %d\n", hash_alg);
return 0;
}
return VB2_SHA256_DIGEST_SIZE;
}
vb2_error_t vb2_hash_verify(const void *buf, uint32_t size, const struct vb2_hash *hash)
{
check_expected_ptr(buf);
check_expected(size);
assert_int_equal(hash->algo, VB2_HASH_SHA256);
if (!memcmp(hash->sha256, good_hash, sizeof(good_hash)))
return VB2_SUCCESS;
if (!memcmp(hash->sha256, bad_hash, sizeof(bad_hash)))
return VB2_ERROR_SHA_MISMATCH;
fail_msg("%s called with bad hash", __func__);
return VB2_ERROR_SHA_MISMATCH;
}
size_t ulzman(const void *src, size_t srcn, void *dst, size_t dstn)
{
fail_msg("Unexpected call to %s", __func__);
return 0;
}
size_t ulz4fn(const void *src, size_t srcn, void *dst, size_t dstn)
{
fail_msg("Unexpected call to %s", __func__);
return 0;
}
vb2_error_t vb2_digest_init(struct vb2_digest_context *dc, enum vb2_hash_algorithm hash_alg)
{
if (hash_alg != VB2_HASH_SHA256) {
fail_msg("Unsupported hash algorithm: %d\n", hash_alg);
return VB2_ERROR_SHA_INIT_ALGORITHM;
}
return VB2_SUCCESS;
}
vb2_error_t vb2_digest_extend(struct vb2_digest_context *dc, const uint8_t *buf, uint32_t size)
{
check_expected(buf);
check_expected(size);
return VB2_SUCCESS;
}
vb2_error_t vb2_digest_finalize(struct vb2_digest_context *dc, uint8_t *digest, uint32_t size)
{
memcpy(digest, mock_ptr_type(void *), size);
return VB2_SUCCESS;
}
/* Original function alias created by test framework. Used for call wrapping in mock below. */
cb_err_t __real_cbfs_lookup(cbfs_dev_t dev, const char *name, union cbfs_mdata *mdata_out,
size_t *data_offset_out, struct vb2_hash *metadata_hash);
cb_err_t cbfs_lookup(cbfs_dev_t dev, const char *name, union cbfs_mdata *mdata_out,
size_t *data_offset_out, struct vb2_hash *metadata_hash)
{
const cb_err_t err =
__real_cbfs_lookup(dev, name, mdata_out, data_offset_out, metadata_hash);
assert_int_equal(mock_type(cb_err_t), err);
return err;
}
/* Tests */
static int setup_test_cbfs(void **state)
{
memset(&cbd, 0, sizeof(cbd));
return 0;
}
static void test_cbfs_map_no_hash(void **state)
{
void *mapping = NULL;
assert_int_equal(0, rdev_chain_mem(&cbd.rdev, &file_no_hash, sizeof(file_no_hash)));
if (CONFIG(CBFS_VERIFICATION)) {
/* File with no hash. No hash causes hash mismatch by default,
so mapping will not be completed successfully. */
expect_value(cbfs_get_boot_device, force_ro, false);
will_return(cbfs_lookup, CB_SUCCESS);
mapping = cbfs_map(TEST_DATA_1_FILENAME, NULL);
assert_null(mapping);
} else {
expect_value(cbfs_get_boot_device, force_ro, false);
will_return(cbfs_lookup, CB_SUCCESS);
mapping = cbfs_map(TEST_DATA_1_FILENAME, NULL);
assert_ptr_equal(mapping, file_no_hash.attrs_and_data);
}
}
static void test_cbfs_map_valid_hash(void **state)
{
void *mapping = NULL;
assert_int_equal(0,
rdev_chain_mem(&cbd.rdev, &file_valid_hash, sizeof(file_valid_hash)));
if (CONFIG(CBFS_VERIFICATION)) {
expect_value(cbfs_get_boot_device, force_ro, false);
expect_value(vb2_hash_verify, buf,
&file_valid_hash.attrs_and_data[HASH_ATTR_SIZE]);
expect_value(vb2_hash_verify, size, TEST_DATA_1_SIZE);
will_return(cbfs_lookup, CB_SUCCESS);
mapping = cbfs_map(TEST_DATA_1_FILENAME, NULL);
assert_ptr_equal(mapping, &file_valid_hash.attrs_and_data[HASH_ATTR_SIZE]);
} else {
expect_value(cbfs_get_boot_device, force_ro, false);
will_return(cbfs_lookup, CB_SUCCESS);
mapping = cbfs_map(TEST_DATA_1_FILENAME, NULL);
assert_ptr_equal(mapping, &file_valid_hash.attrs_and_data[HASH_ATTR_SIZE]);
}
}
static void test_cbfs_map_invalid_hash(void **state)
{
void *mapping = NULL;
assert_int_equal(
0, rdev_chain_mem(&cbd.rdev, &file_broken_hash, sizeof(file_broken_hash)));
if (CONFIG(CBFS_VERIFICATION)) {
expect_value(cbfs_get_boot_device, force_ro, false);
expect_value(vb2_hash_verify, buf,
&file_broken_hash.attrs_and_data[HASH_ATTR_SIZE]);
expect_value(vb2_hash_verify, size, TEST_DATA_1_SIZE);
will_return(cbfs_lookup, CB_SUCCESS);
mapping = cbfs_map(TEST_DATA_1_FILENAME, NULL);
assert_null(mapping);
} else {
expect_value(cbfs_get_boot_device, force_ro, false);
will_return(cbfs_lookup, CB_SUCCESS);
mapping = cbfs_map(TEST_DATA_1_FILENAME, NULL);
assert_ptr_equal(mapping, &file_broken_hash.attrs_and_data[HASH_ATTR_SIZE]);
}
}
void test_init_boot_device_verify(void **state)
{
struct vb2_hash hash = {.algo = VB2_HASH_SHA256};
const uint8_t hash_value[VB2_SHA256_DIGEST_SIZE] = {0};
memset(&cbd, 0, sizeof(cbd));
assert_int_equal(0,
rdev_chain_mem(&cbd.rdev, &file_valid_hash, sizeof(file_valid_hash)));
if (CONFIG(CBFS_VERIFICATION)) {
expect_memory(vb2_digest_extend, buf, &file_valid_hash,
be32_to_cpu(file_valid_hash.header.offset));
expect_value(vb2_digest_extend, size,
be32_to_cpu(file_valid_hash.header.offset));
will_return(vb2_digest_finalize, hash_value);
}
assert_int_equal(CB_SUCCESS, cbfs_init_boot_device(&cbd, &hash));
}
int main(void)
{
const struct CMUnitTest tests[] = {
cmocka_unit_test_setup(test_cbfs_map_no_hash, setup_test_cbfs),
cmocka_unit_test_setup(test_cbfs_map_valid_hash, setup_test_cbfs),
cmocka_unit_test_setup(test_cbfs_map_invalid_hash, setup_test_cbfs),
cmocka_unit_test(test_init_boot_device_verify),
};
return cb_run_group_tests(tests, NULL, NULL);
}

View File

@ -0,0 +1,46 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <tests/lib/cbfs_util.h>
TEST_REGION(cbfs_cache, TEST_CBFS_CACHE_SIZE);
const u8 test_data_1[TEST_DATA_1_SIZE] = { TEST_DATA_1 };
const u8 test_data_2[TEST_DATA_2_SIZE] = { TEST_DATA_2 };
const u8 test_data_int_1[TEST_DATA_INT_1_SIZE] = { BE64(TEST_DATA_INT_1) };
const u8 test_data_int_2[TEST_DATA_INT_2_SIZE] = { BE64(TEST_DATA_INT_2) };
const u8 test_data_int_3[TEST_DATA_INT_3_SIZE] = { BE64(TEST_DATA_INT_3) };
const u8 good_hash[VB2_SHA256_DIGEST_SIZE] = { TEST_SHA256 };
const u8 bad_hash[VB2_SHA256_DIGEST_SIZE] = { INVALID_SHA256 };
const struct cbfs_test_file file_no_hash = {
.header = HEADER_INITIALIZER(CBFS_TYPE_RAW, 0, TEST_DATA_1_SIZE),
.filename = TEST_DATA_1_FILENAME,
.attrs_and_data = {
TEST_DATA_1,
},
};
const struct cbfs_test_file file_valid_hash = {
.header = HEADER_INITIALIZER(CBFS_TYPE_RAW, HASH_ATTR_SIZE, TEST_DATA_1_SIZE),
.filename = TEST_DATA_1_FILENAME,
.attrs_and_data = {
BE32(CBFS_FILE_ATTR_TAG_HASH),
BE32(HASH_ATTR_SIZE),
BE32(VB2_HASH_SHA256),
TEST_SHA256,
TEST_DATA_1,
},
};
const struct cbfs_test_file file_broken_hash = {
.header = HEADER_INITIALIZER(CBFS_TYPE_RAW, HASH_ATTR_SIZE, TEST_DATA_1_SIZE),
.filename = TEST_DATA_1_FILENAME,
.attrs_and_data = {
BE32(CBFS_FILE_ATTR_TAG_HASH),
BE32(HASH_ATTR_SIZE),
BE32(VB2_HASH_SHA256),
INVALID_SHA256,
TEST_DATA_1,
},
};

16
tests/stubs/die.c Normal file
View File

@ -0,0 +1,16 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <stdarg.h>
#include <stdio.h>
#include <tests/test.h>
void die(const char *msg, ...)
{
/* die() can be called in middle a function, so we should not allow for it to return */
static char msg_buf[256];
va_list v;
va_start(v, msg);
vsnprintf(msg_buf, ARRAY_SIZE(msg_buf), msg, v);
va_end(v);
fail_msg("%s", msg_buf);
}