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