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Merge pull request #6024

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296ec7c device: bounds checking in Ledger send_secret/receive_secret (xiphon)
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luigi1111 2019-10-25 16:06:37 -05:00
commit 7caa2b0d3e
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1 changed files with 4 additions and 0 deletions
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src/device/device_ledger.cpp
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@ -357,9 +357,11 @@ namespace hw {
void device_ledger::send_secret(const unsigned char sec[32], int &offset) {
MDEBUG("send_secret: " << this->tx_in_progress);
ASSERT_X(offset + 32 <= BUFFER_SEND_SIZE, "send_secret: out of bounds write (secret)");
memmove(this->buffer_send+offset, sec, 32);
offset +=32;
if (this->tx_in_progress) {
ASSERT_X(offset + 32 <= BUFFER_SEND_SIZE, "send_secret: out of bounds write (mac)");
this->hmac_map.find_mac((uint8_t*)sec, this->buffer_send+offset);
offset += 32;
}
@ -367,9 +369,11 @@ namespace hw {
void device_ledger::receive_secret(unsigned char sec[32], int &offset) {
MDEBUG("receive_secret: " << this->tx_in_progress);
ASSERT_X(offset + 32 <= BUFFER_RECV_SIZE, "receive_secret: out of bounds read (secret)");
memmove(sec, this->buffer_recv+offset, 32);
offset += 32;
if (this->tx_in_progress) {
ASSERT_X(offset + 32 <= BUFFER_RECV_SIZE, "receive_secret: out of bounds read (mac)");
this->hmac_map.add_mac((uint8_t*)sec, this->buffer_recv+offset);
offset += 32;
}