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storage: explicitly initialize variables

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Ondřej Vejpustek 2019-10-04 15:00:24 +02:00 committed by Pavol Rusnak
parent 11aa654abc
commit 97ba9f17d9
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GPG Key ID: 91F3B339B9A02A3D
2 changed files with 71 additions and 70 deletions
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56
storage/norcow.c
View File

@ -109,7 +109,7 @@ static secbool norcow_write(uint8_t sector, uint32_t offset, uint32_t prefix,
static void erase_sector(uint8_t sector, secbool set_magic) {
#if NORCOW_HEADER_LEN > 0
// Backup the sector header.
uint32_t header_backup[NORCOW_HEADER_LEN / sizeof(uint32_t)];
uint32_t header_backup[NORCOW_HEADER_LEN / sizeof(uint32_t)] = {0};
const void *sector_start = norcow_ptr(sector, 0, NORCOW_HEADER_LEN);
memcpy(header_backup, sector_start, sizeof(header_backup));
#endif
@ -208,16 +208,16 @@ static secbool find_item(uint8_t sector, uint16_t key, const void **val,
*val = NULL;
*len = 0;
uint32_t offset;
uint32_t version;
uint32_t offset = 0;
uint32_t version = 0;
if (sectrue != find_start_offset(sector, &offset, &version)) {
return secfalse;
}
for (;;) {
uint16_t k, l;
const void *v;
uint32_t pos;
uint16_t k = 0, l = 0;
const void *v = NULL;
uint32_t pos = 0;
if (sectrue != read_item(sector, offset, &k, &v, &l, &pos)) {
break;
}
@ -234,16 +234,16 @@ static secbool find_item(uint8_t sector, uint16_t key, const void **val,
* Finds first unused offset in given sector
*/
static uint32_t find_free_offset(uint8_t sector) {
uint32_t offset;
uint32_t version;
uint32_t offset = 0;
uint32_t version = 0;
if (sectrue != find_start_offset(sector, &offset, &version)) {
return secfalse;
}
for (;;) {
uint16_t key, len;
const void *val;
uint32_t pos;
uint16_t key = 0, len = 0;
const void *val = NULL;
uint32_t pos = 0;
if (sectrue != read_item(sector, offset, &key, &val, &len, &pos)) {
break;
}
@ -256,8 +256,8 @@ static uint32_t find_free_offset(uint8_t sector) {
* Compacts active sector and sets new active sector
*/
static void compact(void) {
uint32_t offsetr;
uint32_t version;
uint32_t offsetr = 0;
uint32_t version = 0;
if (sectrue != find_start_offset(norcow_active_sector, &offsetr, &version)) {
return;
}
@ -268,9 +268,9 @@ static void compact(void) {
for (;;) {
// read item
uint16_t k, l;
const void *v;
uint32_t posr;
uint16_t k = 0, l = 0;
const void *v = NULL;
uint32_t posr = 0;
secbool r = read_item(norcow_active_sector, offsetr, &k, &v, &l, &posr);
if (sectrue != r) {
break;
@ -283,7 +283,7 @@ static void compact(void) {
}
// copy the item
uint32_t posw;
uint32_t posw = 0;
ensure(write_item(norcow_write_sector, offsetw, k, v, l, &posw),
"compaction write failed");
offsetw = posw;
@ -304,7 +304,7 @@ void norcow_init(uint32_t *norcow_version) {
*norcow_version = 0;
// detect active sector - starts with magic and has highest version
for (uint8_t i = 0; i < NORCOW_SECTOR_COUNT; i++) {
uint32_t offset;
uint32_t offset = 0;
if (sectrue == find_start_offset(i, &offset, &norcow_active_version) &&
norcow_active_version >= *norcow_version) {
found = sectrue;
@ -356,7 +356,7 @@ secbool norcow_get(uint16_t key, const void **val, uint16_t *len) {
secbool norcow_get_next(uint32_t *offset, uint16_t *key, const void **val,
uint16_t *len) {
if (*offset == 0) {
uint32_t version;
uint32_t version = 0;
if (sectrue != find_start_offset(norcow_active_sector, offset, &version)) {
return secfalse;
}
@ -379,9 +379,9 @@ secbool norcow_get_next(uint32_t *offset, uint16_t *key, const void **val,
// Check whether the item is the latest instance.
uint32_t offsetr = *offset;
for (;;) {
uint16_t k;
uint16_t l;
const void *v;
uint16_t k = 0;
uint16_t l = 0;
const void *v = NULL;
ret = read_item(norcow_active_sector, offsetr, &k, &v, &l, &offsetr);
if (sectrue != ret) {
// There is no newer instance of the item.
@ -405,7 +405,7 @@ secbool norcow_get_next(uint32_t *offset, uint16_t *key, const void **val,
* then be written using norcow_update_bytes().
*/
secbool norcow_set(uint16_t key, const void *val, uint16_t len) {
secbool found;
secbool found = secfalse;
return norcow_set_ex(key, val, len, &found);
}
@ -467,7 +467,7 @@ secbool norcow_set_ex(uint16_t key, const void *val, uint16_t len,
compact();
}
// Write new item.
uint32_t pos;
uint32_t pos = 0;
ret = write_item(norcow_write_sector, norcow_free_offset, key, val, len,
&pos);
if (sectrue == ret) {
@ -521,8 +521,8 @@ secbool norcow_delete(uint16_t key) {
* into the NORCOW area.
*/
secbool norcow_update_word(uint16_t key, uint16_t offset, uint32_t value) {
const void *ptr;
uint16_t len;
const void *ptr = NULL;
uint16_t len = 0;
if (sectrue != find_item(norcow_write_sector, key, &ptr, &len)) {
return secfalse;
}
@ -546,8 +546,8 @@ secbool norcow_update_word(uint16_t key, uint16_t offset, uint32_t value) {
*/
secbool norcow_update_bytes(const uint16_t key, const uint16_t offset,
const uint8_t *data, const uint16_t len) {
const void *ptr;
uint16_t allocated_len;
const void *ptr = NULL;
uint16_t allocated_len = 0;
if (sectrue != find_item(norcow_write_sector, key, &ptr, &allocated_len)) {
return secfalse;
}

85
storage/storage.c
View File

@ -151,7 +151,7 @@ static secbool secequal(const void *ptr1, const void *ptr2, size_t n) {
const uint8_t *p1 = ptr1;
const uint8_t *p2 = ptr2;
uint8_t diff = 0;
size_t i;
size_t i = 0;
for (i = 0; i < n; ++i) {
diff |= *p1 ^ *p2;
++p1;
@ -169,7 +169,7 @@ static secbool secequal(const void *ptr1, const void *ptr2, size_t n) {
static secbool secequal32(const uint32_t *ptr1, const uint32_t *ptr2,
size_t n) {
uint32_t diff = 0;
size_t i;
size_t i = 0;
for (i = 0; i < n; ++i) {
uint32_t mask = random32();
diff |= (*ptr1 + mask - *ptr2) ^ mask;
@ -194,7 +194,7 @@ static secbool is_protected(uint16_t key) {
* Initialize the storage authentication tag for freshly wiped storage.
*/
static secbool auth_init(void) {
uint8_t tag[SHA256_DIGEST_LENGTH];
uint8_t tag[SHA256_DIGEST_LENGTH] = {0};
memzero(authentication_sum, sizeof(authentication_sum));
hmac_sha256(cached_sak, SAK_SIZE, authentication_sum,
sizeof(authentication_sum), tag);
@ -209,7 +209,7 @@ static secbool auth_update(uint16_t key) {
return sectrue;
}
uint8_t tag[SHA256_DIGEST_LENGTH];
uint8_t tag[SHA256_DIGEST_LENGTH] = {0};
hmac_sha256(cached_sak, SAK_SIZE, (uint8_t *)&key, sizeof(key), tag);
for (uint32_t i = 0; i < SHA256_DIGEST_LENGTH; i++) {
authentication_sum[i] ^= tag[i];
@ -224,7 +224,7 @@ static secbool auth_update(uint16_t key) {
* tag.
*/
static secbool auth_set(uint16_t key, const void *val, uint16_t len) {
secbool found;
secbool found = secfalse;
secbool ret = norcow_set_ex(key, val, len, &found);
if (sectrue == ret && secfalse == found) {
ret = auth_update(key);
@ -245,8 +245,8 @@ static secbool auth_get(uint16_t key, const void **val, uint16_t *len) {
uint32_t sum[SHA256_DIGEST_LENGTH / sizeof(uint32_t)] = {0};
// Prepare inner and outer digest.
uint32_t odig[SHA256_DIGEST_LENGTH / sizeof(uint32_t)];
uint32_t idig[SHA256_DIGEST_LENGTH / sizeof(uint32_t)];
uint32_t odig[SHA256_DIGEST_LENGTH / sizeof(uint32_t)] = {0};
uint32_t idig[SHA256_DIGEST_LENGTH / sizeof(uint32_t)] = {0};
hmac_sha256_prepare(cached_sak, SAK_SIZE, odig, idig);
// Prepare SHA-256 message padding.
@ -338,7 +338,8 @@ static void derive_kek(uint32_t pin, const uint8_t *random_salt,
REVERSE32(pin, pin);
#endif
uint8_t salt[HARDWARE_SALT_SIZE + RANDOM_SALT_SIZE + EXTERNAL_SALT_SIZE];
uint8_t salt[HARDWARE_SALT_SIZE + RANDOM_SALT_SIZE + EXTERNAL_SALT_SIZE] = {
0};
size_t salt_len = 0;
memcpy(salt + salt_len, hardware_salt, HARDWARE_SALT_SIZE);
@ -357,7 +358,7 @@ static void derive_kek(uint32_t pin, const uint8_t *random_salt,
ui_callback(ui_rem, progress, ui_message);
}
PBKDF2_HMAC_SHA256_CTX ctx;
PBKDF2_HMAC_SHA256_CTX ctx = {0};
pbkdf2_hmac_sha256_Init(&ctx, (const uint8_t *)&pin, sizeof(pin), salt,
salt_len, 1);
for (int i = 1; i <= 5; i++) {
@ -389,14 +390,14 @@ static void derive_kek(uint32_t pin, const uint8_t *random_salt,
}
static secbool set_pin(uint32_t pin, const uint8_t *ext_salt) {
uint8_t buffer[RANDOM_SALT_SIZE + KEYS_SIZE + POLY1305_TAG_SIZE];
uint8_t buffer[RANDOM_SALT_SIZE + KEYS_SIZE + POLY1305_TAG_SIZE] = {0};
uint8_t *rand_salt = buffer;
uint8_t *ekeys = buffer + RANDOM_SALT_SIZE;
uint8_t *pvc = buffer + RANDOM_SALT_SIZE + KEYS_SIZE;
uint8_t kek[SHA256_DIGEST_LENGTH];
uint8_t keiv[SHA256_DIGEST_LENGTH];
chacha20poly1305_ctx ctx;
uint8_t kek[SHA256_DIGEST_LENGTH] = {0};
uint8_t keiv[SHA256_DIGEST_LENGTH] = {0};
chacha20poly1305_ctx ctx = {0};
random_buffer(rand_salt, RANDOM_SALT_SIZE);
derive_kek(pin, rand_salt, ext_salt, kek, keiv);
rfc7539_init(&ctx, kek, keiv);
@ -482,12 +483,12 @@ static secbool pin_logs_init(uint32_t fails) {
// The format of the PIN_LOGS_KEY entry is:
// guard_key (1 word), pin_success_log (PIN_LOG_WORDS), pin_entry_log
// (PIN_LOG_WORDS)
uint32_t logs[GUARD_KEY_WORDS + 2 * PIN_LOG_WORDS];
uint32_t logs[GUARD_KEY_WORDS + 2 * PIN_LOG_WORDS] = {0};
logs[0] = generate_guard_key();
uint32_t guard_mask;
uint32_t guard;
uint32_t guard_mask = 0;
uint32_t guard = 0;
wait_random();
if (sectrue != expand_guard_key(logs[0], &guard_mask, &guard)) {
return secfalse;
@ -550,8 +551,8 @@ void storage_init(PIN_UI_WAIT_CALLBACK callback, const uint8_t *salt,
}
// If there is no EDEK, then generate a random DEK and SAK and store them.
const void *val;
uint16_t len;
const void *val = NULL;
uint16_t len = 0;
if (secfalse == norcow_get(EDEK_PVC_KEY, &val, &len)) {
init_wiped_storage();
}
@ -567,8 +568,8 @@ static secbool pin_fails_reset(void) {
return secfalse;
}
uint32_t guard_mask;
uint32_t guard;
uint32_t guard_mask = 0;
uint32_t guard = 0;
wait_random();
if (sectrue !=
expand_guard_key(*(const uint32_t *)logs, &guard_mask, &guard)) {
@ -608,8 +609,8 @@ secbool storage_pin_fails_increase(void) {
return secfalse;
}
uint32_t guard_mask;
uint32_t guard;
uint32_t guard_mask = 0;
uint32_t guard = 0;
wait_random();
if (sectrue !=
expand_guard_key(*(const uint32_t *)logs, &guard_mask, &guard)) {
@ -668,8 +669,8 @@ static secbool pin_get_fails(uint32_t *ctr) {
return secfalse;
}
uint32_t guard_mask;
uint32_t guard;
uint32_t guard_mask = 0;
uint32_t guard = 0;
wait_random();
if (sectrue !=
expand_guard_key(*(const uint32_t *)logs, &guard_mask, &guard)) {
@ -681,7 +682,7 @@ static secbool pin_get_fails(uint32_t *ctr) {
const uint32_t *success_log = ((const uint32_t *)logs) + GUARD_KEY_WORDS;
const uint32_t *entry_log = success_log + PIN_LOG_WORDS;
volatile int current = -1;
volatile size_t i;
volatile size_t i = 0;
for (i = 0; i < PIN_LOG_WORDS; ++i) {
if ((entry_log[i] & guard_mask) != guard ||
(success_log[i] & guard_mask) != guard ||
@ -760,9 +761,9 @@ static secbool decrypt_dek(const uint8_t *kek, const uint8_t *keiv) {
_Static_assert(((RANDOM_SALT_SIZE + KEYS_SIZE) & 3) == 0, "PVC unaligned");
_Static_assert((PVC_SIZE & 3) == 0, "PVC size unaligned");
uint8_t keys[KEYS_SIZE];
uint8_t keys[KEYS_SIZE] = {0};
uint8_t tag[POLY1305_TAG_SIZE] __attribute__((aligned(sizeof(uint32_t))));
chacha20poly1305_ctx ctx;
chacha20poly1305_ctx ctx = {0};
// Decrypt the data encryption key and the storage authentication key and
// check the PIN verification code.
@ -784,7 +785,7 @@ static secbool decrypt_dek(const uint8_t *kek, const uint8_t *keiv) {
// Check that the authenticated version number matches the norcow version.
// NOTE: storage_get_encrypted() calls auth_get(), which initializes the
// authentication_sum.
uint32_t version;
uint32_t version = 0;
if (sectrue !=
storage_get_encrypted(VERSION_KEY, &version, sizeof(version), &len) ||
len != sizeof(version) || version != norcow_active_version) {
@ -801,7 +802,7 @@ static secbool unlock(uint32_t pin, const uint8_t *ext_salt) {
}
// Get the pin failure counter
uint32_t ctr;
uint32_t ctr = 0;
if (sectrue != pin_get_fails(&ctr)) {
memzero(&pin, sizeof(pin));
return secfalse;
@ -847,8 +848,8 @@ static secbool unlock(uint32_t pin, const uint8_t *ext_salt) {
handle_fault("no EDEK");
return secfalse;
}
uint8_t kek[SHA256_DIGEST_LENGTH];
uint8_t keiv[SHA256_DIGEST_LENGTH];
uint8_t kek[SHA256_DIGEST_LENGTH] = {0};
uint8_t keiv[SHA256_DIGEST_LENGTH] = {0};
derive_kek(pin, (const uint8_t *)rand_salt, ext_salt, kek, keiv);
memzero(&pin, sizeof(pin));
@ -860,7 +861,7 @@ static secbool unlock(uint32_t pin, const uint8_t *ext_salt) {
}
// Check that the PIN fail counter was incremented.
uint32_t ctr_ck;
uint32_t ctr_ck = 0;
if (sectrue != pin_get_fails(&ctr_ck) || ctr + 1 != ctr_ck) {
handle_fault("PIN counter increment");
return secfalse;
@ -932,8 +933,8 @@ static secbool storage_get_encrypted(const uint16_t key, void *val_dest,
const uint8_t *tag_stored = (const uint8_t *)val_stored + CHACHA20_IV_SIZE;
const uint8_t *ciphertext =
(const uint8_t *)val_stored + CHACHA20_IV_SIZE + POLY1305_TAG_SIZE;
uint8_t tag_computed[POLY1305_TAG_SIZE];
chacha20poly1305_ctx ctx;
uint8_t tag_computed[POLY1305_TAG_SIZE] = {0};
chacha20poly1305_ctx ctx = {0};
rfc7539_init(&ctx, cached_dek, iv);
rfc7539_auth(&ctx, (const uint8_t *)&key, sizeof(key));
chacha20poly1305_decrypt(&ctx, ciphertext, (uint8_t *)val_dest, *len);
@ -1007,7 +1008,7 @@ static secbool storage_set_encrypted(const uint16_t key, const void *val,
}
// Write the IV to the flash.
uint8_t buffer[CHACHA20_BLOCK_SIZE];
uint8_t buffer[CHACHA20_BLOCK_SIZE] = {0};
random_buffer(buffer, CHACHA20_IV_SIZE);
uint16_t offset = 0;
if (sectrue != norcow_update_bytes(key, offset, buffer, CHACHA20_IV_SIZE)) {
@ -1016,10 +1017,10 @@ static secbool storage_set_encrypted(const uint16_t key, const void *val,
offset += CHACHA20_IV_SIZE + POLY1305_TAG_SIZE;
// Encrypt all blocks except for the last one.
chacha20poly1305_ctx ctx;
chacha20poly1305_ctx ctx = {0};
rfc7539_init(&ctx, cached_dek, buffer);
rfc7539_auth(&ctx, (const uint8_t *)&key, sizeof(key));
size_t i;
size_t i = 0;
for (i = 0; i + CHACHA20_BLOCK_SIZE < len;
i += CHACHA20_BLOCK_SIZE, offset += CHACHA20_BLOCK_SIZE) {
chacha20poly1305_encrypt(&ctx, ((const uint8_t *)val) + i, buffer,
@ -1092,7 +1093,7 @@ secbool storage_set_counter(const uint16_t key, const uint32_t count) {
// The count is stored as a 32-bit integer followed by a tail of "1" bits,
// which is used as a tally.
uint32_t value[1 + COUNTER_TAIL_WORDS];
uint32_t value[1 + COUNTER_TAIL_WORDS] = {0};
memset(value, 0xff, sizeof(value));
value[0] = count;
return storage_set(key, value, sizeof(value));
@ -1143,7 +1144,7 @@ secbool storage_has_pin(void) {
}
const void *val = NULL;
uint16_t len;
uint16_t len = 0;
if (sectrue != norcow_get(PIN_NOT_SET_KEY, &val, &len) ||
(len > 0 && *(uint8_t *)val != FALSE_BYTE)) {
return secfalse;
@ -1206,7 +1207,7 @@ static void __handle_fault(const char *msg, const char *file, int line,
// We use the PIN fail counter as a fault counter. Increment the counter,
// check that it was incremented and halt.
in_progress = sectrue;
uint32_t ctr;
uint32_t ctr = 0;
if (sectrue != pin_get_fails(&ctr)) {
storage_wipe();
__fatal_error("Fault detected", msg, file, line, func);
@ -1217,7 +1218,7 @@ static void __handle_fault(const char *msg, const char *file, int line,
__fatal_error("Fault detected", msg, file, line, func);
}
uint32_t ctr_new;
uint32_t ctr_new = 0;
if (sectrue != pin_get_fails(&ctr_new) || ctr + 1 != ctr_new) {
storage_wipe();
}
@ -1298,7 +1299,7 @@ static secbool storage_upgrade(void) {
continue;
}
secbool ret;
secbool ret = secfalse;
if (((key >> 8) & FLAG_PUBLIC) != 0) {
ret = norcow_set(key, val, len);
} else {