test/avb_util_unittest.cc

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <string.h>

#include <gtest/gtest.h>

#include "libavb.h"

TEST(UtilTest, RSAPublicKeyHeaderByteswap) {
  AvbRSAPublicKeyHeader h;
  AvbRSAPublicKeyHeader s;
  uint32_t n32;
  uint64_t n64;

  n32 = 0x11223344;
  n64 = 0x1122334455667788;

  h.key_num_bits = htobe32(n32);
  n32++;
  h.n0inv = htobe32(n32);
  n32++;

  EXPECT_NE(0, avb_rsa_public_key_header_validate_and_byteswap(&h, &s));

  n32 = 0x11223344;
  n64 = 0x1122334455667788;

  EXPECT_EQ(n32, s.key_num_bits);
  n32++;
  EXPECT_EQ(n32, s.n0inv);
  n32++;
}

TEST(UtilTest, FooterByteswap) {
  AvbFooter h;
  AvbFooter s;
  AvbFooter other;
  AvbFooter bad;
  uint64_t n64;

  n64 = 0x1122334455667788;

  memcpy(h.magic, AVB_FOOTER_MAGIC, AVB_FOOTER_MAGIC_LEN);
  h.version_major = htobe32(AVB_FOOTER_MAJOR_VERSION);
  h.version_minor = htobe32(AVB_FOOTER_MINOR_VERSION);
  h.original_image_size = htobe64(n64);
  n64++;
  h.vbmeta_offset = htobe64(n64);
  n64++;
  h.vbmeta_size = htobe64(n64);
  n64++;

  EXPECT_NE(0, avb_footer_validate_and_byteswap(&h, &s));

  n64 = 0x1122334455667788;

  EXPECT_EQ((uint32_t)AVB_FOOTER_MAJOR_VERSION, s.version_major);
  EXPECT_EQ((uint32_t)AVB_FOOTER_MINOR_VERSION, s.version_minor);
  EXPECT_EQ(n64, s.original_image_size);
  n64++;
  EXPECT_EQ(n64, s.vbmeta_offset);
  n64++;
  EXPECT_EQ(n64, s.vbmeta_size);
  n64++;

  // Check that the struct still validates if minor is bigger than
  // what we expect.
  other = h;
  h.version_minor = htobe32(AVB_FOOTER_MINOR_VERSION + 1);
  EXPECT_NE(0, avb_footer_validate_and_byteswap(&other, &s));

  // Check for bad magic.
  bad = h;
  bad.magic[0] = 'x';
  EXPECT_EQ(0, avb_footer_validate_and_byteswap(&bad, &s));

  // Check for bad major version.
  bad = h;
  bad.version_major = htobe32(AVB_FOOTER_MAJOR_VERSION + 1);
  EXPECT_EQ(0, avb_footer_validate_and_byteswap(&bad, &s));
}

TEST(UtilTest, KernelCmdlineDescriptorByteswap) {
  AvbKernelCmdlineDescriptor h;
  AvbKernelCmdlineDescriptor s;
  AvbKernelCmdlineDescriptor bad;
  uint64_t nbf;

  // Specify 44 bytes of data past the end of the descriptor struct.
  nbf = 44 + sizeof(AvbKernelCmdlineDescriptor) - sizeof(AvbDescriptor);
  h.parent_descriptor.num_bytes_following = htobe64(nbf);
  h.parent_descriptor.tag = htobe64(AVB_DESCRIPTOR_TAG_KERNEL_CMDLINE);
  h.kernel_cmdline_length = htobe32(44);

  EXPECT_NE(0, avb_kernel_cmdline_descriptor_validate_and_byteswap(&h, &s));

  EXPECT_EQ(AVB_DESCRIPTOR_TAG_KERNEL_CMDLINE, s.parent_descriptor.tag);
  EXPECT_EQ(nbf, s.parent_descriptor.num_bytes_following);
  EXPECT_EQ(44UL, s.kernel_cmdline_length);

  // Check for bad tag.
  bad = h;
  bad.parent_descriptor.tag = htobe64(0xf00dd00d);
  EXPECT_EQ(0, avb_kernel_cmdline_descriptor_validate_and_byteswap(&bad, &s));

  // Doesn't fit in 45 bytes.
  bad = h;
  bad.kernel_cmdline_length = htobe32(45);
  EXPECT_EQ(0, avb_kernel_cmdline_descriptor_validate_and_byteswap(&bad, &s));
}

TEST(UtilTest, HashtreeDescriptorByteswap) {
  AvbHashtreeDescriptor h;
  AvbHashtreeDescriptor s;
  AvbHashtreeDescriptor bad;
  uint64_t nbf;
  uint32_t n32;
  uint64_t n64;

  // Specify 40 bytes of data past the end of the descriptor struct.
  nbf = 40 + sizeof(AvbHashtreeDescriptor) - sizeof(AvbDescriptor);
  h.parent_descriptor.num_bytes_following = htobe64(nbf);
  h.parent_descriptor.tag = htobe64(AVB_DESCRIPTOR_TAG_HASHTREE);
  h.partition_name_len = htobe32(10);
  h.salt_len = htobe32(10);
  h.root_digest_len = htobe32(10);

  n32 = 0x11223344;
  n64 = 0x1122334455667788;

  h.dm_verity_version = htobe32(n32);
  n32++;
  h.image_size = htobe64(n64);
  n64++;
  h.tree_offset = htobe64(n64);
  n64++;
  h.tree_size = htobe64(n64);
  n64++;
  h.data_block_size = htobe32(n32);
  n32++;
  h.hash_block_size = htobe32(n32);
  n32++;

  EXPECT_NE(0, avb_hashtree_descriptor_validate_and_byteswap(&h, &s));

  n32 = 0x11223344;
  n64 = 0x1122334455667788;

  EXPECT_EQ(n32, s.dm_verity_version);
  n32++;
  EXPECT_EQ(n64, s.image_size);
  n64++;
  EXPECT_EQ(n64, s.tree_offset);
  n64++;
  EXPECT_EQ(n64, s.tree_size);
  n64++;
  EXPECT_EQ(n32, s.data_block_size);
  n32++;
  EXPECT_EQ(n32, s.hash_block_size);
  n32++;

  EXPECT_EQ(AVB_DESCRIPTOR_TAG_HASHTREE, s.parent_descriptor.tag);
  EXPECT_EQ(nbf, s.parent_descriptor.num_bytes_following);
  EXPECT_EQ(10UL, s.partition_name_len);
  EXPECT_EQ(10UL, s.salt_len);
  EXPECT_EQ(10UL, s.root_digest_len);

  // Check for bad tag.
  bad = h;
  bad.parent_descriptor.tag = htobe64(0xf00dd00d);
  EXPECT_EQ(0, avb_hashtree_descriptor_validate_and_byteswap(&bad, &s));

  // Doesn't fit in 40 bytes (30 + 10 + 10 = 50).
  bad = h;
  bad.partition_name_len = htobe32(30);
  EXPECT_EQ(0, avb_hashtree_descriptor_validate_and_byteswap(&bad, &s));

  // Doesn't fit in 40 bytes (10 + 30 + 10 = 50).
  bad = h;
  bad.salt_len = htobe32(30);
  EXPECT_EQ(0, avb_hashtree_descriptor_validate_and_byteswap(&bad, &s));

  // Doesn't fit in 40 bytes (10 + 10 + 30 = 50).
  bad = h;
  bad.root_digest_len = htobe32(30);
  EXPECT_EQ(0, avb_hashtree_descriptor_validate_and_byteswap(&bad, &s));
}

TEST(UtilTest, HashDescriptorByteswap) {
  AvbHashDescriptor h;
  AvbHashDescriptor s;
  AvbHashDescriptor bad;
  uint64_t nbf;

  // Specify 44 bytes of data past the end of the descriptor struct.
  nbf = 44 + sizeof(AvbHashDescriptor) - sizeof(AvbDescriptor);
  h.parent_descriptor.num_bytes_following = htobe64(nbf);
  h.parent_descriptor.tag = htobe64(AVB_DESCRIPTOR_TAG_HASH);
  h.partition_name_len = htobe32(10);
  h.salt_len = htobe32(10);
  h.digest_len = htobe32(10);

  EXPECT_NE(0, avb_hash_descriptor_validate_and_byteswap(&h, &s));

  EXPECT_EQ(AVB_DESCRIPTOR_TAG_HASH, s.parent_descriptor.tag);
  EXPECT_EQ(nbf, s.parent_descriptor.num_bytes_following);
  EXPECT_EQ(10UL, s.partition_name_len);
  EXPECT_EQ(10UL, s.salt_len);
  EXPECT_EQ(10UL, s.digest_len);

  // Check for bad tag.
  bad = h;
  bad.parent_descriptor.tag = htobe64(0xf00dd00d);
  EXPECT_EQ(0, avb_hash_descriptor_validate_and_byteswap(&bad, &s));

  // Doesn't fit in 44 bytes (30 + 10 + 10 = 50).
  bad = h;
  bad.partition_name_len = htobe32(30);
  EXPECT_EQ(0, avb_hash_descriptor_validate_and_byteswap(&bad, &s));

  // Doesn't fit in 44 bytes (10 + 30 + 10 = 50).
  bad = h;
  bad.salt_len = htobe32(30);
  EXPECT_EQ(0, avb_hash_descriptor_validate_and_byteswap(&bad, &s));

  // Doesn't fit in 44 bytes (10 + 10 + 30 = 50).
  bad = h;
  bad.digest_len = htobe32(30);
  EXPECT_EQ(0, avb_hash_descriptor_validate_and_byteswap(&bad, &s));
}

TEST(UtilTest, ChainPartitionDescriptorByteswap) {
  AvbChainPartitionDescriptor h;
  AvbChainPartitionDescriptor s;
  AvbChainPartitionDescriptor bad;
  uint64_t nbf;

  // Specify 36 bytes of data past the end of the descriptor struct.
  nbf = 36 + sizeof(AvbChainPartitionDescriptor) - sizeof(AvbDescriptor);
  h.parent_descriptor.num_bytes_following = htobe64(nbf);
  h.parent_descriptor.tag = htobe64(AVB_DESCRIPTOR_TAG_CHAIN_PARTITION);
  h.rollback_index_slot = htobe32(42);
  h.partition_name_len = htobe32(16);
  h.public_key_len = htobe32(17);

  EXPECT_NE(0, avb_chain_partition_descriptor_validate_and_byteswap(&h, &s));

  EXPECT_EQ(AVB_DESCRIPTOR_TAG_CHAIN_PARTITION, s.parent_descriptor.tag);
  EXPECT_EQ(nbf, s.parent_descriptor.num_bytes_following);
  EXPECT_EQ(42UL, s.rollback_index_slot);
  EXPECT_EQ(16UL, s.partition_name_len);
  EXPECT_EQ(17UL, s.public_key_len);

  // Check for bad tag.
  bad = h;
  bad.parent_descriptor.tag = htobe64(0xf00dd00d);
  EXPECT_EQ(0, avb_chain_partition_descriptor_validate_and_byteswap(&bad, &s));

  // Check for bad rollback index slot (must be at least 1).
  bad = h;
  bad.rollback_index_slot = htobe32(0);
  EXPECT_EQ(0, avb_chain_partition_descriptor_validate_and_byteswap(&bad, &s));

  // Doesn't fit in 40 bytes (24 + 17 = 41).
  bad = h;
  bad.partition_name_len = htobe32(24);
  EXPECT_EQ(0, avb_chain_partition_descriptor_validate_and_byteswap(&bad, &s));

  // Doesn't fit in 40 bytes (16 + 25 = 41).
  bad = h;
  bad.public_key_len = htobe32(25);
  EXPECT_EQ(0, avb_chain_partition_descriptor_validate_and_byteswap(&bad, &s));
}

TEST(UtilTest, PropertyDescriptorByteswap) {
  AvbPropertyDescriptor h;
  AvbPropertyDescriptor s;
  AvbPropertyDescriptor bad;
  uint64_t nbf;

  // Specify 40 bytes of data past the end of the descriptor struct.
  nbf = 40 + sizeof(AvbPropertyDescriptor) - sizeof(AvbDescriptor);
  h.parent_descriptor.num_bytes_following = htobe64(nbf);
  h.parent_descriptor.tag = htobe64(AVB_DESCRIPTOR_TAG_PROPERTY);
  h.key_num_bytes = htobe64(16);
  h.value_num_bytes = htobe64(17);

  EXPECT_NE(0, avb_property_descriptor_validate_and_byteswap(&h, &s));

  EXPECT_EQ(AVB_DESCRIPTOR_TAG_PROPERTY, s.parent_descriptor.tag);
  EXPECT_EQ(nbf, s.parent_descriptor.num_bytes_following);
  EXPECT_EQ(16UL, s.key_num_bytes);
  EXPECT_EQ(17UL, s.value_num_bytes);

  // Check for bad tag.
  bad = h;
  bad.parent_descriptor.tag = htobe64(0xf00dd00d);
  EXPECT_EQ(0, avb_property_descriptor_validate_and_byteswap(&bad, &s));

  // Doesn't fit in 40 bytes (22 + 17 + 2 = 41).
  bad = h;
  bad.key_num_bytes = htobe64(22);
  EXPECT_EQ(0, avb_property_descriptor_validate_and_byteswap(&bad, &s));

  // Doesn't fit in 40 bytes (16 + 23 + 2 = 41).
  bad = h;
  bad.value_num_bytes = htobe64(23);
  EXPECT_EQ(0, avb_property_descriptor_validate_and_byteswap(&bad, &s));
}

TEST(UtilTest, DescriptorByteswap) {
  AvbDescriptor h;
  AvbDescriptor s;
  uint64_t n64;

  n64 = 0x1122334455667788;

  h.num_bytes_following = htobe64(n64);
  n64++;
  h.tag = htobe64(n64);
  n64++;

  EXPECT_NE(0, avb_descriptor_validate_and_byteswap(&h, &s));

  n64 = 0x1122334455667788;

  EXPECT_EQ(n64, s.num_bytes_following);
  n64++;
  EXPECT_EQ(n64, s.tag);
  n64++;

  // Check that we catch if |num_bytes_following| isn't divisble by 8.
  h.num_bytes_following = htobe64(7);
  EXPECT_EQ(0, avb_descriptor_validate_and_byteswap(&h, &s));
}

TEST(UtilTest, SafeAddition) {
  uint64_t value;
  uint64_t pow2_60 = 1ULL << 60;

  value = 2;
  EXPECT_NE(0, avb_safe_add_to(&value, 5));
  EXPECT_EQ(7UL, value);

  /* These should not overflow */
  value = 1 * pow2_60;
  EXPECT_NE(0, avb_safe_add_to(&value, 2 * pow2_60));
  EXPECT_EQ(3 * pow2_60, value);
  value = 7 * pow2_60;
  EXPECT_NE(0, avb_safe_add_to(&value, 8 * pow2_60));
  EXPECT_EQ(15 * pow2_60, value);
  value = 9 * pow2_60;
  EXPECT_NE(0, avb_safe_add_to(&value, 3 * pow2_60));
  EXPECT_EQ(12 * pow2_60, value);
  value = 0xfffffffffffffffcUL;
  EXPECT_NE(0, avb_safe_add_to(&value, 2));
  EXPECT_EQ(0xfffffffffffffffeUL, value);

  /* These should overflow. */
  value = 8 * pow2_60;
  EXPECT_EQ(0, avb_safe_add_to(&value, 8 * pow2_60));
  value = 0xfffffffffffffffcUL;
  EXPECT_EQ(0, avb_safe_add_to(&value, 4));
}

static int avb_validate_utf8z(const char* data) {
  return avb_validate_utf8(reinterpret_cast<const uint8_t*>(data),
                           strlen(data));
}

TEST(UtilTest, UTF8Validation) {
  // These should succeed.
  EXPECT_NE(0, avb_validate_utf8z("foo bar"));
  // Encoding of U+00E6 LATIN SMALL LETTER AE: æ
  EXPECT_NE(0, avb_validate_utf8z("foo \xC3\xA6 bar"));
  // Encoding of U+20AC EURO SIGN: €
  EXPECT_NE(0, avb_validate_utf8z("foo \xE2\x82\xAC bar"));
  // Encoding of U+1F466 BOY: 👦
  EXPECT_NE(0, avb_validate_utf8z("foo \xF0\x9F\x91\xA6 bar"));
  // All three runes following each other.
  EXPECT_NE(0, avb_validate_utf8z("\xC3\xA6\xE2\x82\xAC\xF0\x9F\x91\xA6"));

  // These should fail.
  EXPECT_EQ(0, avb_validate_utf8z("foo \xF8 bar"));
  EXPECT_EQ(0, avb_validate_utf8z("\xF8"));
  // Stops in the middle of Unicode rune.
  EXPECT_EQ(0, avb_validate_utf8z("foo \xC3"));
}

TEST(UtilTest, StrConcat) {
  char buf[8];

  // These should succeed.
  EXPECT_NE(0, avb_str_concat(buf, sizeof buf, "foo", 3, "bar1", 4));

  // This should fail: Insufficient space.
  EXPECT_EQ(0, avb_str_concat(buf, sizeof buf, "foo0", 4, "bar1", 4));
}

TEST(UtilTest, StrStr) {
  const char* haystack = "abc def abcabc";

  EXPECT_EQ(nullptr, avb_strstr(haystack, "needle"));
  EXPECT_EQ(haystack, avb_strstr(haystack, "abc"));
  EXPECT_EQ(haystack + 4, avb_strstr(haystack, "def"));
  EXPECT_EQ(haystack, avb_strstr(haystack, haystack));
}

TEST(UtilTest, StrReplace) {
  // We don't care about leaking strings from avb_replace().
  EXPECT_EQ("OK blah bah $(FOO OK blah",
            std::string(avb_replace("$(FOO) blah bah $(FOO $(FOO) blah",
                                    "$(FOO)", "OK")));
  EXPECT_EQ("OK", std::string(avb_replace("$(FOO)", "$(FOO)", "OK")));
  EXPECT_EQ(" OK", std::string(avb_replace(" $(FOO)", "$(FOO)", "OK")));
  EXPECT_EQ("OK ", std::string(avb_replace("$(FOO) ", "$(FOO)", "OK")));
  EXPECT_EQ("LONGSTRINGLONGSTRING",
            std::string(avb_replace("$(FOO)$(FOO)", "$(FOO)", "LONGSTRING")));
}